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Schroeder - Pump Protection Brochure

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1 Version 1.0 INFO i V i 10 V V R
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1

Version 1.0

INFO

iV i 1 0V

V

R

1INFOINFO

The Compensating Bypass Check Valve is a pump

protection device. It automatically protects centrifu-

gal pumps from damage which might occur through

partial evaporation of the pump contents during low

load operation. Every Compensating Bypass Check

Valve is designed particularly for the necessary

pumps and plant data. Please transmit the following

data for a particular valve design to:

Schroeder Valves GmbH & Co. KG

[email protected]

Company: Project:

Name: Quantity:

Phone: Inquiry-No.:

Fax: Date:

1. Non return valve in the bypass branch * no yes

2. Installation * vertical horizontal

3. Variable Pump Speed * no yes

4. Medium *

5. Density * [kg/m3]

6. Operating Temperature * [°C] [°F]

7. Standards * DIN ANSI Other

8. Max. Capacity Qmax

[m3/h]

9. Design Capacity Q100%

* [m3/h]

10. Total Head at Q100%

* [m]

11. Bypass Flow QBy

* [m3/h]

12. Total Head at QBy

* [m]

13. Pump inlet pressure * [bar]

14. Back pressure on bypass branch [bar]

15. Valve pressure rating

16. Valve Flange size / rating inlet outlet bypass

17. Valve Flange sealing

18. Additional branch yes, function

19. Pump curve attached no yes

In case of pump protection the SR/SA-type is

highly associated with modern process control and

be precisely adjusted to customers resp. plant

requirements.

Please transmit the following data for a particular

valve design to:

Schroeder Valves GmbH & Co. KG

[email protected]

Company: Project:

Name: Quantity:

Phone: Inquiry-No.:

Fax: Date:

1. Type of power SR SA Preferred company and type:

1.1 electric

1.2 pneumatic

1.3 hydraulic

1.4 medium conrolled (only SA)

2. Accessories

3. Technical Data 4. Preferred type

Pressure rate pD

[bar] angle type

Temperature TD

[°C] z-type

Medium straight through

Density [kg/m3]

5. Process data

Loading condition I II III IV

Flow rate Q [m3/h]

Inlet pressure pi [bar]

Outlet pressure po [bar]

max [bar]

Inlet temperature Ti [°C]

6. Pipe connection

Flange DN Inlet

Welding end DN Outlet

Others Material

1INFOINFO

Our Special-Compensating Bypass Check Valves and

our Multiport Throttles are designed according to the

AD 2000 Standard (e.g. in calculation and choice of

material).

and particularly to EN 13445. As per Pressure Equip-

ment Directive 97/23 EG the products are provided

with the CE marking and the Declaration of Confor-

Equipment Directive 97/23 EG) all dangerous material

classes of category 1 to 4 are covered.

All pressure holding parts of our products are built from

For all products you can get acc. to standard

EN 10204

• a Test report 2.2 or

since 1995 and according to the new DIN EN ISO

9001:2000 since 2003.

water, 134 °C

density in operat. temp. 0.93 kg/dm3

100% 63 m3/h

head in Q100% 288 m

The Compensating Bypass Check Valves do not

only protect pumps from damages. Compared with a

plant. Example:

operating time p.a. 330 days per 24h

cost of energy

NPSHR

By12 m3/h 325 m 0.38 1.7 m

100%63 m3/h 288 m 0.73 2.4 m

QBy

+ Q100%

75 m3/h 288 m 0.76 3.1 m

QBy 26 kW 26 kW –

energy costs (p.a.)

By

10,300,- E 10,300,- E –

Q100% 72 kW 63 kW

energy costs (p.a.)

100%

28,500,- E 24,900,- E E

E

2

SSSSV 10-12

Special Compensating Bypass

Check Valve

2

SSV

10-12

The Compensating Bypass Check Valves of the

ranges from –250 °C up to +400 °C. The valves are

manufactured in the sizes DN 25 to DN 500 and the

range of nominal pressure is PN 10 up to PN 400

35%.

The valve operates without additional auxiliary

energy.

of above 2200 m we recommend the range SMA

63/64 (see prospect) with „ON-OFF-regulation“ of

the bypass.

controlled, that means the non-return cone (3) is kept

is designed in such a way, that the cone reaches its

The non-return cone activates the Rotary Slide Valve

(13) in the bypass by means of a lever (14). If the

cone is positioned on the cone seat, the Rotary Slide

Valve is completely open. It closes correspon-

ding to the rising of the cone by delivery in main

direction. The valve just allows such an amount of

Valves SSV should preferably be connected directly

to the pump discharge branch, and must be mounted

possibilities for horizontal installation exist, but

All bypass valve components are easily serviced.

To facilitate serving of the bypass valve, we

recommend installing a pressure relieve valve and a

stop valve. The stop valve must be of a type which

can be locked in the OPEN position.

scheme of our Compensating Bypass Check Valve.

The hand-operated bypass feature is optional.

In order to avoid vibrations in the valve and the

pipes we recommend continuing the connecting line

at the outlet (DN2) and Bypass branch (DN3) for

approx. 2-3 m in the chosen nominal size. A pipe

bend directly at the bypass branch is not admissible.

SSVSSV

The Compensating Bypass Check Valve type SSV

10-12 is a pump protection device. It automatically

protects centrifugal pumps – especially those

handling hot water – from damage which might

occur through partial evaporation of the water

content during low load operation.

As soon as the pump capacity drops below a prede-

-

valve to the boiler or process is completely shut off.

The pressure will be reduced by integrated throttle

stages within the bypass.

The type SSV 12 is supplied with a larger Bypass.

differential pressure. The choice is done in our works.

viscosity < 150 cSt without solids, e.g.:

• in boiler feed water and cooling water plants

• in Petrochemical and Chemical Industry and

refrigeration

• in potable water supply and backwater disposal

• Offshore

• in snow production

• in steel production

The utilization in nuclear power plants emphasizes

2

SSV

10-12

Lower body Part-No. 1

Upper body Part-No. 2

Cone Part-No. 3

Cone guide Part-No. 4

Cone guide Part-No. 5

Bypass branch Part-No. 10

Valve head casing Part-No. 12

Rotary slide valve Part-No. 13

Operating lever Part-No. 14

Throttle Part-No. 15

Hand-op. branch Part-No. 24

Multi-port throttle Part-No. 25

O-Ring Part-No. 78.1

O-Ring Part-No. 78.2

Socket screw Part-No. 91.1

Socket screw Part-No. 91.2

Dowel pin Part-No. 94.1

Dowel pin Part-No. 94.2

Coil spring Part-No. 95.1

(95.2)

Coil spring Part-No. 95.3

Bypass Valve Head, complete Part-No. 60, consisting of:

Casing Part-No. 12

Rotary slide valve Part-No. 13

Operating lever Part-No. 14

Dowel pin Part-No. 94.1

Dowel pin Part-No. 94.2

Throttle in the Bypass Branch, consisting of:

Throttle Part-No. 15

O-Ring Part-No. 78.2

Single Spare Parts

O-Ring Part-No. 78.1

Coil spring Part-No. 95.1

(95.2)

SSVSSV

AD 2000 and particularly to EN 13445. As per

Pressure Equipment Directive 97/23 EG the products

are provided with the CE marking and the Declara-

-

le H1 (Pressure Equipment Directive 97/23 EG) all

dangerous material classes of category 1 to 4 are

covered. Suitable nominal size and nominal pressure

are to be chosen according to the pump pressure

branch. However, it must be observed, that the

exceeded (guarantee). Compensating Bypass Check

Valves in larger sizes, for higher pressures and in

special designs, which are not listed here, can also

be supplied (on request).

result in vibrations within the plant, a hammering

Compensating Bypass Check Valve resp. a damage

-

tion“).

The Valve SSV comprises a radial split body with

non-return cone (3), and a separate bypass device

in the bypass branch.

All sliding parts are machined from proven stainless

steels suitably matched to each other. Parts subjects

to wear such as the check valve seat are stellite-

faced. The coil springs are also made of stainless

steel. In the standard version the casing is of forged

steel P250GH (1.0460). In addition high-quality

steels of various qualities can be supplied.

-

matically by the Bypass valve head (12).

The pressure reduction from pump pressure to the

counter pressure in the bypass line takes place via

the Bypass Valve Head (12) and the throttle (15), for

higher pressure with multistage throttles.

The hand operating branch with multiport-throttle is

valve combination. We recommend the branch for

protection of the internal bypass parts at extreme

operating conditions, e.g. at high differential pres-

sures and frequent operation in the range of bypass

Start-Up-Trim (SUT) substitutes the Bypass valve

head during cleaning and start-up of plants and

therefore spares the sophisticated regulating parts

(optional, permanently open Bypass outlet). Also

usable instead of the Hand operating branch

Warm-up branch, pressure gauge branch, draining

branch etc. can be provided, if required.

Flange designs to DIN, ANSI, BS, ISO and all rela-

ted standards are possible.

• Compensating Bypass Check Valves with control

disc and bearing plate in the bypass for high

• Autonomous Minimum Flow System Type

SMA 63/64 from DN 65 up-wards at pump

pressures from PN 250 - 400 bar.

of high-pressure media from DN 15 upwards and

pressures from PN 10 to PN 640 bar.

2

SSV

10PN H S

80

10-40 7.38

80

254050

25

310 120220220240

120 220454649

3

63 7.38 4.59254050

350 130230230250

130 230596061

5

100 7.38 4.59 3.50254050

370 130240240260

130 240727377

5

160 5.57 4.04 3.23254050

370 130240240260

130 240727374

6

250 5.57 4.04 3.23254050

400 150250250270

150 250102103107

8

100

10-40 11.00

100

405065

380

380 145280280300

145 280757679

3

63 11.00 6.85405065

390 145280280300

145 2809697

1006

100 11.00 6.85 5.22405065

430 155300300320

155 300116117121

6

160 8.34 6.04 4.83405065

430 155300300320

155 300116117121

7

250 8.34 6.04 4.83405065

500 180320320340

180 320183185190

9

125

10-40 17.71

125

405065

40

440 165360360380

165 360192118123

4

63 17.71 12.01405065

460 165360360380

165 360158160165

7

100 17.71 12.01 9.36405065

500 170360360380

170 360192194200

9

160 12.68 10.02 8.32405065

500 170360360380

170 360192194200

10

250 12.68 10.02 8.32405065

570 190380380400

190 380264267274

12

150

10-40 22.78

150

506580

50

500 190380390410

190 380179181186

7

63 22.78 16.12506580

520 190400400420

190 400229231236

10

100 22.78 16.12 12.75506580

580 190400400420

190 400261264270

13

160 18.73 14.47 11.88506580

580 190400400420

190 400288291297

15

250 18.73 13.49 11.32506580

630 220420420440

220 420378381389

19

SSVSSV

PN H S

32

10-40 2.48

32

1525

25

240 93165165 93 165

1819 2

63 2.48 1.811525 3

100 2.48 1.81 1.441525 3

1601525 3.5

2501525 4.5

40

10-40 2.48

40

152532

25

220 78170170180

78 170192022

2

63 2.48 1.81152532

270 100190190200

100 190303133

3

100 2.48 1.81 1.44152532

270 100190190200

100 190303133

3

160 2.25 1.71 1.40152532

270 100190190200

100 190303133

3.5

250 2.25 1.71 1.40152532

300 115195195200

115 195414244

4.5

50

10-40 3.21

50

152532

25

250 90180180200

90 180272830

2

63 3.21 2.03152532

250 105200200

105 200363739

3

100 3.21 2.03 1.55152532

290 105200200

105 200434446

3

160 2.93 1.96 1.51152532

290 105200200

105 200434446

3.5

250 2.93 1.96 1.51152532

330 125205205

125 205505151

4.5

65

10-40 4.42

65

254050

25

280 105200200210

105 200414244

2

63 4.42 2.99254050

320 120220225235

120 220545557

3

100 4.42 2.99 2.33254050

340 125220225235

125 220666769

3

160 3.67 2.73 2.21254050

340 125220225235

125 220666769

3.5

250 3.67 2.73 2.21254050

370 140240240250

140 240818285

4.5

2

SSV

10PN H S

150 2.48 240 93165165 96 165

1819 2

300 2.48 1.81 280 103170170 103 170

2627 3

600 2.48 1.81 1.44 29 3

900 37 3.5

1500 40 4.5

150 2.48 220 78170170180

78 170191920

2

300 2.48 1.81 270 100170170180

100 170272728

3

600 2.48 1.81 1.44 270 100190190200

100 190282931

3

900 2.25 1.71 1.40 320 125200200210

125 200363739

3.5

1500 2.25 1.71 1.40 320 125200200210

125 200394042

4.5

150 3.21 250 90180180190

90 180272829

2

300 3.21 2.03 270 100180180190

100 180323334

3

600 3.21 2.03 1.55 290 105200200210

105 200394042

3

900 2.93 1.96 1.51 325 125210210220

125 210525355

3.5

1500 2.93 1.96 1.51 350 135210210220

135 210616264

4.5

150 4.42 280 105200200210

105 200434445

2

300 4.42 2.99 300 115200200210

115 200515253

3

600 4.42 2.99 2.33 340 125220225235

125 220626465

3

900 3.67 2.73 2.21 370 140230235245

140 230757779

3.5

1500 3.67 2.73 2.21 390 150240240250

150 240919396

4.5

SSV

1) Weight of hand-operating branch

Other pipe sizes, pressure ranges and special designs are deliverable on request.

With reservation to changes of dimensions and weights.

PN H S

200

10-40 55.42

200

6580

100

65

630 240460470490

240 460360364370

10

63 55.45 30.476580

100650 240

480480500

240 480401403409

14

100 55.45 30.47 22.516580

100680 240

500500520

240 500443446454

17

160 31.78 23.96 19.476580

100720 240

520520540

240 520456459467

20

250 21.47 18.50 16.186580

100830 265

590590610

265 590700704714

27

250

10-40 67.44

250

80100125

80

730 265520520540

265 520658661667

17

63 67.44 45.0680

100125

760 265550550570

265 550696699705

22

100 67.44 45.06 34.8680

100125

840 280590590610

280 590784788796

23

160 39.82 33.27 28.4780

100125

880 280590590610

280 590810814822

29

250 37.65 31.93 27.6280

100125

1050 340700700720

340 700123412391249

59

300

10-40 100.27

300

100125150

100

860 320580580600

320 580823826832

20

63 100.27 68.81100125150

900 320640640660

320 640881884890

28

100 100.27 68.81 53.37100125150

1050 330650650670

330 650111311181126

29

160 50.79 44.56 39.57100125150

1050 330650650670

330 650111311181126

38

250 50.79 44.56 39.57100125150

1200 380740740760

380 740204320512062

75

SSV

10

SSV

2

SSV

10PN H S

150 55.42 630 240460470490

240 460360362368

10

300 55.42 30.47 650 240480480500

240 480390392398

14

600 55.42 30.47 22.51 680 240500500520

240 500442445453

17

900 31.78 23.96 19.47 750 250530530550

250 530592595603

20

1500 21.47 18.50 16.18 880 295590590610

295 590727730740

27

150 67.44 730 265520520540

265 520646648654

17

300 67.44 45.06 750 270530530550

270 530690692698

22

600 67.44 45.06 34.86 840 280590590610

280 590795800808

23

900 39.82 33.27 28.47 900 290590590610

290 590917922930

29

1500 37.65 31.93 27.62 1100 370700700720

370 700114914551465

59

150 100.27 860 320590590600

320 580816818842

20

300 100.27 68.81 880 320600600620

320 600879881887

28

600 100.27 68.81 53.37 1050 330650650670

330 350109611011110

29

900 50.79 44.56 39.57 1050 330650650670

330 650129412991308

38

1500 50.79 44.56 39.57 1250 410740740760

410 740199820052016

75

1) Weight of hand-operating branch

Other pipe sizes, pressure ranges and special designs are deliverable on request.

With reservation to changes of dimensions and weights.

SSV

PN H S

150 7.38 310 120220220240

120 220454649

3

300 7.38 4.59 330 125230230250

125 230596063

5

600 7.38 4.59 3.50 370 130240240260

130 240798084

5

900 5.57 4.04 3.23 390 140240240260

140 240848589

6

1500 5.57 4.04 3.23 430 160250255275

160 250116117121

8

150 11.00 380 145280280300

145 280777882

3

300 11.00 6.85 390 145280280300

145 280102103107

6

600 11.00 6.85 5.22 430 155300300320

155 300127128133

6

900 8.34 6.04 4.83 450 165300300320

165 300154155160

7

1500 8.34 6.04 4.83 520 190320320340

190 320194196202

9

150 17.71 450 165360360380

165 360119121126

4

300 17.71 12.01 460 165360360380

165 360158160165

7

600 17.71 12.01 9.36 500 170360360380

170 360221223229

9

900 12.68 10.02 8.32 530 185360370390

185 360258261268

10

1500 12.68 10.02 8.32 630 230390390410

230 390341344351

12

150 22.78 500 190380380400

190 380178179184

7

300 22.78 16.12 520 190400400420

190 400224227333

10

600 22.78 16.12 12.75 580 190400400420

190 400273

2728213

900 18.73 14.47 11.88 600 200410420430

200 410335337344

15

1500 16.73 13.49 11.32 700 260420420440

260 420410413421

19

SSV

2

SSV

12PN H S

100

10-40 17.71

100

405065

40

410 160350350370

160 350104105110

3

63 17.71 11.77405065

420 160350350370

160 350125126131

6

100 17.71 11.77405065

460 170350350370

170 350132134140

6

160 17.71 11.77405065

480 170350350370

170 350132134140

7

250405065

125

10-40 18.73

125

506580

50

470 180380390140

180 380120123129

4

63 18.73 14.24506580

100506580

160506580

250506580

150

10-40 48.16

150

6580

100

65

520 190420430450

190 420183186193

7

63 48.16 42.566580

100

100 48.16 42.566580

100620 210

460460480

210 480278281290

13

160 48.16 42.566580

100620 210

490490510

210 490320323331

15

2506580

100

200

10-40 39.82

200

80100125

80

650 240490490510

240 490366370376

1

63 39.82 32.8780

100125

680 270520520540

270 520409411418

14

10080

100125

16080

100125

25080

100125

SSV

PN H S

40

10-40 2.93

40

152540

25

220 78170170180

78 170191920

2

63 2.93 1.91152540

3

100152540

160152540

250152540

50

10-40 3.67

50

254050

25

260 95200200210

95 200333538

2

63 3.67 2.67254050

300 120220225235

120 220424447

3

100254050

160254050

250254050

65

10-40 5.57

65

254050

25

290 110220220240

110 220474851

2

63 5.57 3.96254050

330 125230230250

125 230606164

3

100254050

160254050

250254050

80

10-40 8.34 5.92

80

405065

40

330 130280280300

130 280505154

3

63 8.34 5.92405065

100 8.34 5.92405065

400 150300300320

150 300939498

5

160 8.34 5.92405065

400 150300300320

150 300939498

6

250405065

SSV

2

SSV

12PN H S

150 2.93 220 78170170180

78 170191920

2

300 2.93 1.91 270 100170170180

100 170272728

3

600

900

1500

150 3.67 250 90200200210

90 200293032

2

300 3.67 2.67 280 105200200210

105 200353638

3

600

900

1500

150 5.57 290 110220220230

110 220474850

2

300 5.57 3.96 310 120230230250

120 230555659

3

600

900

1500

150 8.34 5.92 330 130280280300

130 280505155

3

300 8.34 5.92 350 135280280300

135 280626367

600 8.34 5.92 390 140300300320

140 300858691

5

900 8.34 5.92 410 150300300320

150 300105106111

6

1500

SSV

SSV

12PN H S

250

10-40 53.25

250

100125150

100

750 270560560580

270 560662664672

17

63 53.25 32.82100125150

100100125150

160100125150

250100125150

300

10-40 172.02

300

125150200

125

860 320580580600

320 580830832842

20

63 172.02 80.39125150200

100125150200

160125150200

250125150200

1) Weight of hand-operating branch

Other pipe sizes, pressure ranges and special designs are deliverable on request.

With reservation to changes of dimensions and weights.

SSV

2

SSV

12

1) Weight of hand-operating branch

Other pipe sizes, pressure ranges and special designs are deliverable on request.

With reservation to changes of dimensions and weights.

PN H S

150 53.25 750 270560560580

270 560662664670

17

300 53.25 32.82 770 275580580600

275 580705707716

600

900

1500

150 172.02 860 320580580600

320 580830832842

20

300 172.02 80.39 880 320580580600

320 580896898908

600

900

1500

SSV

PN H S

150 17.71 410 160350350370

160 350104106111

3

300 17.71 11.77 420 160350350370

160 350108110115

6

600 17.71 11.77 460 170360360380

170 360132134140

6

900 17.71 11.77 7

1500

150 18.73 480 180370370390

180 370125127132

4

300 18.73 14.24 500 180390390410

180 390164166171

600

900

1500

150 48.16 520 190420430450

190 420183185191

7

300 48.16 42.56 540 190440440460

190 440229232238

600 48.16 42.56 620 210460460480

210 460287281289

13

900 48.16 42.56 640 220500500520

220 500340343351

15

1500

150 39.82 650 240490490510

240 490368370376

1

300 39.82 32.87 690 260500500520

260 500398400406

14

600

900

1500

SSV

3

S S

SSV 18-20

Special Compensating Bypass

Check Valve

3

SSV

18-20

SSV

The Compensating Bypass Check Valves of the

ranges from –250°C up to +400°C. The valves are

manufactured in the sizes DN 25 to DN 500 and the

range of nominal pressure is PN 10 up to PN 400

to 35%.

The valve operates without additional auxiliary

energy.

of above 2200 m we recommend the range SMA

63/64 (see prospect) with „ON-OFF-regulation“ of

the bypass.

controlled, that means the non-return cone (3) is kept

is designed in such a way, that the cone reaches its

The non-return cone activates the Rotary Slide Valve

(13) in the bypass by means of a lever (14). If the

cone is positioned on the cone seat, the Rotary Slide

Valve is completely open. It closes corresponding to

the rising of the cone by delivery in main direction.

as it is necessary for supplement of the required

Valves SSV should preferably be connected directly

to the pump discharge branch, and must be mounted

possibilities for horizontal installation exist, but

All bypass valve components are easily serviced.

To facilitate serving of the bypass valve, we

recommend to install a pressure relieve valve and a

stop valve. The stop valve must be of a type which

can be locked in the OPEN position.

scheme of our Compensating Bypass Check Valve.

The hand-operated bypass feature is optional.

In order to avoid vibrations in the valve and the

pipes we recommend continuing the connecting line

at the outlet (DN2) and Bypass branch (DN3) for

approx. 2-3 m in the chosen nominal size. A pipe

bend directly at the bypass branch is not admissible.

SSV

Compared to the series SSV 10-12, the series SSV

18-20 uses an integrated non-return valve in the by-

pass. It automatically protects centrifugal pumps –

especially those handling hot water – from damage

which might occur through partial evaporation of the

water content during low load operation.

As soon as the pump capacity drops below a prede-

-

valve to the boiler or process is completely shut off.

The pressure will be reduced by integrated throttle

stages within the bypass.

The type SSV 20 is supplied with a larger bypass.

differential pressure. The choice is done in our

works.

-

cosity < 150 cSt without solids, e.g.:

• in boiler feed water and cooling water plants

• in Petrochemical and Chemical Industry and

refrigeration

• in potable water supply and backwater disposal

• Offshore

• in snow production

• in steel production

The utilization in nuclear power plants emphasizes

3

SSV

18-20

Lower body Part-No. 1

Upper body Part-No. 2

Cone Part-No. 3

Cone guide Part-No. 4

Cone guide Part-No. 5

Bypass branch Part-No. 10

Valve head casing Part-No. 12

Rotary slide valve Part-No. 13

Operating lever Part-No. 14

Throttle Part-No. 16

Non-Return Valve Part-No. 17

Hand-op. branch Part-No. 24

Multi-port throttle Part-No. 25

O-Ring Part-No. 78.1

O-Ring Part-No. 78.2

Socket screw Part-No. 91.1

Socket screw Part-No. 91.2

Coil spring Part-No. 95.1

(95.2)

Coil spring Part-No. 95.3

Bypass Valve Head, complete Part-No. 60 consisting of:

Casing Part-No. 12

Rotary slide valve Part-No. 13

Operating lever Part-No. 14

Dowel pin Part-No. 94.1

Dowel pin Part-No. 94.2

Non-Return Valve in the Bypass Branch, complete, consisting of:

Throttle Part-No. 16

Non-Return Valve Part-No. 17

O-Ring Part-No. 78.2

Coil spring Part-No. 95.3

Single Spare Parts

O-Ring Part-No. 78.1

O-Ring Part-No. 78.2

Coil spring Part-No. 95.1

(95.2)

Coil spring Part-No. 95.3

SSVSSV

AD 2000 and particularly to EN 13445. As per

Pressure Equipment Directive 97/23 EG the products

are provided with the CE marking and the Declaration

H1 (Pressure Equipment Directive 97/23 EG) all

dangerous material classes of category 1 to 4 are

covered. Suitable nominal size and nominal pressure

are to be chosen according to the pump pressure

branch. However, it must be observed, that the

exceeded (guarantee). Compensating Bypass Check

Valves in larger sizes, for higher pressures and in

special designs, which are not listed here, can also

be supplied (on request).

result in vibrations within the plant, a hammering

Compensating Bypass Check Valve resp. a damage

-

tion“).

The Valve SSV comprises a radial split body with

non-return cone (3), and a separate bypass device

in the bypass branch.

All sliding parts are machined from proven stainless

steels suitably matched to each other. Parts subjects

to wear such as the check valve seat are stellite-

faced. The coil springs are also made of stainless

steel. In the standard version the casing is of

forged steel P250GH (1.0460). In addition high-

quality steels of various qualities can be supplied.

-

tically by the Bypass valve head (12). The pressure

reduction from pump pressure to the counter pressure

in the bypass line takes place via the Bypass Valve

Head (12), the throttle (16) and the valve (17) for

type SSV 18/20.

The hand operating branch with multiport-throttle is

valve combination. We recommend the branch for

protection of the internal bypass parts at extreme

operating conditions, e.g. at high differential pres-

sures and frequent operation in the range of bypass

Start-Up-Trim (SUT) substitutes the Bypass valve

head during cleaning and start-up of plants and

therefore spares the sophisticated regulating parts

(optional, permanently open Bypass outlet). Also

usable instead of the Hand operating branch

Warm-up branch, pressure gauge branch, draining

branch etc. can be provided, if required.

Flange designs to DIN, ANSI, BS, ISO and all

related standards are possible.

• Compensating Bypass Check Valves with control

disc and bearing plate in the bypass for high

• Autonomous Minimum Flow System Type

SMA 63/64 from DN 65 up-wards at pump

pressures from PN 250 – 400 bar.

of high-pressure media from DN 15 upwards and

pressures from PN 10 to PN 640 bar.

3

SSV

18PN H S

65

10-40 3.87

65

254050

40

280 105205205215

105 205414244

2

63 3.87254050

320 120220225235

120 225535558

3

100 3.87254050

340 125220225235

125 225656770

3

160 3.34254050

340 125220225235

125 225656770

3.5

250 3.34254050

370 140240240250

140 240808286

4.5

80

10-40 6.45

80

254050

40

310 120245230250

120 230484650

3

63 6.45254050

350 130245230250

130 230626064

5

100 6.45254050

370 130250240260

130 240747378

5

160 5.14254050

370 130250240260

130 240747378

6

250 5.14254050

400 150255250270

150 250103103108

8

100

10-40 9.67

100

405065

50

380 145280280300

145 280757680

3

63 9.67405065

390 145280280300

145 2809697

1016

100 9.67405065

430 155300300320

155 300116117122

6

160 7.72405065

430 155300300320

155 300116117122

7

250 7.72405065

500 180320320340

180 320184185191

9

125

10-40 15.91

125

506580

50

440 165360360380

165 360116118122

4

63 15.91506580

460 165360360380

165 360158160165

7

100 15.91506580

500 170360360380

170 360192194200

9

160 11.96506580

500 170360360380

170 360195197203

10

250 11.96506580

570 190380380400

190 380265267274

12

SSV

PN H S

25

10-40 2.30

25

152

25

220 78180170 78 170

2020 2

63 2.301525 270 100

190190 100 190

3031 3

100 2.301525 270 100

190190 100 190

3031 3

160 2.121525 270 100

190190 100 190

3031 3.5

250 2.121525 300 115

195195 115 195

4142 4.5

32

10-40 2.30

32

1525

25

220 78180170 78 170

2020 2

63 2.301525 270 100

190190 100 190

3031 3

100 2.301525 270 100

190190 100 190

3031 3

160 2.121525 270 100

190190 100 190

3031 3.5

250 2.121525 300 115

195195 115 195

4141 4.5

40

10-40 2.30

40

152532

25

220 78180170180

78 170202022

2

63 2.30152532

270 100190190200

100 190303133

3

100 2.30152532

270 100190190200

100 190303133

3

160 2.12152532

270 100190190200

100 190303133

3.5

250 2.12152532

300 115195195205

115 195414244

4.5

50

10-40 2.86

50

152532

25

250 90190180190

90 180282830

2

63 2.86152532

280 105200200210

105 200363739

3

100 2.86152532

290 105200200210

105 200434446

3

160 2.65152532

290 105200200210

105 200434446

3.5

250 2.65152532

330 125205205215

125 205505153

4.5

SSV

3

SSV

18PN H S

150 2.30 220 78180170 78 170

1919 2

300 2.30 270 100180170 100 170

2727 3

600 2.30 270 100190190 100 190

2829 3

900 2.12 320 125200200 125 200

3637 3.5

1500 2.12 320 125200200 125 200

3940 4.5

150 2.30 220 78170170 78 170

1919 2

300 2.30 270 100180170 100 170

2727 3

600 2.30 270 100190190 100 190

2829 3

900 2.12 320 125200200 125 200

3637 3.5

1500 2.12 320 125200200 125 200

3940 4.5

150 2.30 220 78180170180

78 170191920

2

300 2.30 270 100180170180

100 170272728

3

600 2.30 270 100190190200

100 190282931

3

900 2.12 320 125200200210

125 200363739

3.5

1500 2.12 320 125200200210

125 200394042

4.5

150 2.86 250 90190180190

90 180282829

2

300 2.86 270 100190180190

100 180333334

3

600 2.86 290 105200200210

105 200394042

3

900 2.65 325 125210210220

125 210525355

3.5

1500 2.65 350 135210210220

135 210616264

4.5

SSV

SSV

18PN H S

150

10-40 23.13

150

6080

100

65

500 190390395415

190 390181184191

7

63 23.136080

100520 190

400405425

190 400231234241

10

100 23.136080

100580 190

420420440

190 420264266274

13

160 16.056080

100580 190

420420440

190 420291293301

15

250 16.056080

100630 220

420420440

220 420381383393

19

200

10-40 44.84

200

80100125

80

630 240480480500

240 480364366372

10

63 44.8480

100125

650 240485485505

240 485403405411

14

100 44.8480

100125

680 240510520540

240 510446451459

17

160 20.9680

100125

720 240520535555

240 520459464473

20

250 20.9680

100125

830 265590590610

265 590704707717

27

250

10-40 55.05

250

100125150

100

730 265560560580

265 560661664672

17

63 55.05100125150

760 265550550570

265 550699702710

22

100 55.05100125150

840 280590590610

280 590788791799

23

160 34.97100125150

880 280590590610

280 590814817826

29

250 34.97100125150

1050 340700700720

340 700123912431253

59

300

10-40 81.85

300

125150200

125

860 320640640660

320 640826829837

20

63 81.85125150200

900 320640640660

320 640884887895

28

100 81.85125150200

1050 330680680100

330 680111811231133

29

160 42.29125150200

1050 330680680700

330 680111811231133

38

250 42.29125150200

1200 380740740760

380 740205120562066

75

1) Weight of hand-operating branch

Other pipe sizes, pressure ranges and special designs are deliverable on request.

With reservation to changes of dimensions and weights.

SSV

3

SSV

18PN H S

150 23.13 500 190390395415

190 390179181187

7

300 23.13 520 190390395415

190 390227230236

10

600 23.13 580 190420420440

190 420275277284

13

900 16.05 600 200420420440

200 420337339346

15

1500 16.05 700 260420420440

260 420413416424

19

150 44.84 630 240480480500

240 480362364370

10

300 44.84 650 240480480500

240 480392394400

14

600 44.84 680 240510520540

240 510445450458

17

900 20.96 750 250520535555

250 520595601609

20

1500 20.96 880 295590590610

295 590730733741

27

150 55.05 730 265560560580

265 560648650656

17

300 55.05 750 270560560580

270 560692694700

22

600 55.05 840 280590590610

280 590800805813

23

900 34.67 900 290590590610

290 590922927935

29

1500 34.67 1100 370700700720

370 700145514611471

59

150 81.85 860 320635635655

320 635818820826

20

300 81.85 880 320640640660

320 640881883889

28

600 81.85 1050 330680680700

330 680110111061115

29

900 42.29 1050 330680680700

330 680129913041313

38

1500 42.29 1250 410740740760

410 740200520122024

75

1) Weight of hand-operating branch

Other pipe sizes, pressure ranges and special designs are deliverable on request.

With reservation to changes of dimensions and weights.

SSV

PN H S

150 3.87 280 105205205215

105 205434445

2

300 3.87 300 115205205215

115 205515253

3

600 3.87 340 125220225235

125 225626367

3

900 3.34 370 140230235245

140 235757780

3.5

1500 3.34 390 150240240250

150 240919397

4.5

150 6.45 310 120245230250

120 230484650

3

300 6.45 330 125245230250

125 230626064

5

600 6.45 370 130250240260

130 240818084

5

900 5.14 390 140250245265

140 245858589

6

1500 5.14 430 160255250270

160 250117117121

8

150 9.67 380 145280280300

145 280777882

3

300 9.67 390 145280280300

145 280102103107

6

600 9.67 430 155300300320

155 300126128133

6

900 7.72 450 165300310320

165 310152155159

7

1500 7.72 520 190320320340

190 320192196202

9

150 15.91 450 165360360380

165 360121123128

4

300 15.91 480 165370360380

165 370160161166

7

600 15.91 500 170360360380

170 360223225231

9

900 11.96 530 185370375395

185 370261264271

10

1500 11.96 630 230390390410

230 390344346353

12

SSV

3

SSV

20

SSV

SSV

20

SSV

PN H S

100

10-40 15.91

100

506580

50

410 160350350370

160 350108109113

5

63 15.91506580

420 160350350370

160 350129130134

6

100 15.91506580

460 170350350370

170 350136137141

6

160506580

460 170350350370

170 350136137141

6

250506580

125

10-40 23.13

125

6580

100

40

470 180380385405

180 380120122128

7

63 23.136580

100490 180

390395415

180 390197200207

8

1006580

100

1606580

100

2506580

100

150

10-40 46.79

150

80100125

80

520 190440440460

190 440187188195

7

63 46.7980

100125

550 200445445465

200 445240242249

10

100 46.7980

100125

620 210470480500

210 470276279287

13

160 46.7980

100125

620 210480495515

210 480338343352

15

25080

100125

200

10-40 33.33

200

100125150

100

650 240530530550

240 530390393402

10

63 33.33100125150

670 240520520540

240 520449451460

14

100100125150

720 260560560580

260 560517520532

20

160100125150

760 260560560580

260 560540543555

20

250100125150

PN H S

40

10-40 2.86

40

152532

25

220 78180170180

78 170202021

2

63 2.86152532

270 100190190200

100 190303132

3

100152535

160152535

250152535

50

10-40 3.87

50

254050

40

260 95205205215

95 205333538

2

63 3.87254050

300 120220225235

120 225434548

3

100 3.87254050

160254050

250254050

65

10-40 6.45

65

254050

40

290 110245230250

110 230514952

2

63 6.45254050

330 125245230250

125 230596164

3

100254050

160254050

250254050

80

10-40 9.67

80

405065

50

330 130280280300

130 280515256

5

63 9.67405065

100 9.67405065

400 150300300320

150 300939498

6

160 9.67405065

400 150300300320

150 300939498

6

250405065

3

SSV

20PN H S

150 2.86 220 78180170180

78 170191920

2

300 2.86 270 100180170180

100 170272728

3

600

900

1500

150 3.87 250 90205205215

90 250313234

2

300 3.87 280 105205205215

105 205383941

3

600 3.87 310 120220225235

120 225424447

3

900

1500

150 6.45 290 110245230250

110 230535154

2

300 6.45 310 120245230250

120 230585659

3

600

900

1500

150 9.67 330 130280280300

130 280505155

3

300 9.67 350 135280280300

135 280626367

5

600 9.67 390 140240240260

140 240858691

5

900 9.67 410 150300310320

150 310105106111

6

1500

SSV

SSV

20

SSV

PN H S

250

10-40 50.56

250

125150200

125

750 270620620640

270 620671673683

20

63 50.56125150200

750 270620620640

270 620712715726

23

100125150200

160125150200

250125150200

300

10-40

300

150200250

150

63150200250

100150200250

160150200250

250150200250

3

SSV

20

1) Weight of hand-operating branch

Other pipe sizes, pressure ranges and special designs are deliverable on request.

With reservation to changes of dimensions and weights.

SSV

PN H S

150 15.91 410 160350350370

160 350106107111

3

300 15.91 420 160360360380

160 360110111115

6

600 15.91 460 170360360380

170 360134135140

6

900

1500

150 23.13 480 180380385405

180 380127129134

4

300 23.13 500 180380385405

180 380166168173

7

600

900

1500

150 46.79 520 190440440460

190 440185186193

7

300 46.79 540 190440440460

190 440232233241

10

600 46.79 620 210470480500

210 470281284292

13

900 46.79 640 220490505525

220 490343348357

15

1500

150 33.33 650 240530530550

240 530387380389

10

300 33.33 690 280530530

260 530408410419

14

600

900

1500

SSV

PN H S

150 50.56 750 270620620640

270 620677680691

17

300 50.56 770 275620620

275 620726729740

22

600

900

1500

150

300

600

900

1500

4

SSSV 40-49

Special Compensating Bypass

Check Valve

SS

4

SSV

40-49

Lower body Part-No. 1

Upper body Part-No. 2

Cone complete Part-No. 3

Cone guide Part-No. 4

Cone guide Part-No. 5

Bypass-branch Part-No. 30

Adapter Part-No. 31

Lever Part-No. 32

Toothed segment Part-No. 33

Bearing pin Part-No. 34

Pin cover plate Part-No. 35

Carrier plate Part-No. 36

Control disc Part-No. 37

Bearing plate Part-No. 38

Throttle Part-No. 40

Stud bolt Part-No. 90.1

Eye bolt Part-No. 90.2

Socket screw Part-No. 91.1

Socket screw Part-No. 91.2

Cap nut Part-No. 92

Dowel pin Part-No. 94.1

Dowel pin Part-No. 94.2

Dowel pin Part-No. 94.3

Coil spring Part-No. 95.1

Control disc complete, consisting of:

Control disc Part-No. 37

Bearing plate Part-No. 38

Dowel pin Part-No. 94.3

Single Spare Parts

Coil spring Part-No. 95.1

SSV

The Compensating Bypass Check Valve type SSV

40 to 49 is a pump protection device. Based on the

SSV 10 to 20 series it was especially designed for

pressure load.

(with Type SSV 10 to 20 approx. 35% nominal pump

QBy can be gathered from table 1.

The SSV 40 to 49 valves normally are manufactured

in the sizes DN 50 to DN 600 (resp. NVS 2” to NVS

24”). Other sizes are deliverable on request. For de-

is limited to approx. 80 bar. Other operating limits

and application ranges are equal to the SSV 10 to

20 series.

The Compensating Bypass Check Valve with control

means the non-return cone (3) is kept in his operating

such a way, that the cone reaches its utmost upper

The non-return cone (3) activates the control disc (37)

in the bypass by means of the lever (32). If the cone

is positioned on the cone seat, the control disc (37) is

completely open. It closes corresponding to the rising

of the cone by delivery in main direction. The valve

necessary for supplement of the required minimum

other hand the bypass opens again, when the main

SSV

DIN ANSI

Typ DN DN

SSV 40 50-80 25-40 10.50 12.29

SSV 41 80-125 40-50 21.00 24.57

SSV 42 100-150 65-80 42.00 49.14

SSV 43 150-250 100-125 80.00 93.60

SSV 44 200-400 125-150 120.00 140.40

SSV 45 250-400 125-150 172.00 201.24

SSV 46 300-500 150-250 240.00 280.80

SSV 47 350-600 200-300 350.00 409.50

SSV 48 350-600 250-350 502.00 587.34

SSV 49 400-600 350-400 780.00 912.60

5

SSSV 70-79

Special Compensating Bypass

Check Valve

SS

5

SSV

70-79

Lower body Part-No. 1

Upper body Part-No. 2

Cone complete Part-No. 3

Cone guide Part-No. 4

Cone guide Part-No. 5

Bypass-branch Part-No. 30

Adapter Part-No. 31

Lever Part-No. 32

Toothed segment Part-No. 33

Bearing pin Part-No. 34

Pin cover plate Part-No. 35

Carrier plate Part-No. 36

Control disc Part-No. 37

Bearing plate Part-No. 38

Throttle Part-No. 40

Socket screw Part-No. 90.1

Eye bolt Part-No. 90.2

Socket screw Part-No. 91.1

Socket screw Part-No. 91.2

Cap nut Part-No. 92

Dowel pin Part-No. 94.1

Dowel pin Part-No. 94.2

Dowel pin Part-No. 94.3

Coil spring Part-No. 95.1

Control disc complete, consisting of:

Control disc Part-No. 37

Bearing plate Part-No. 38

Dowel pin Part-No. 94.3

Throttle Part-No. 16

Non-return valve Part-No. 17

Single Spare Parts

Coil spring Part-No. 95.1

Coil spring Part-No. 95.3

SSV

The Compensating Bypass Check Valve type SSV

70 to 79 is a pump protection device. In addition to

the SSV 40-49 series the SSV 70-79 series uses a

non-return valve in the bypass. Based on the SSV

10 to 20 series it was especially designed for centri-

can be delivered through the bypass as minimum

values QBy

can be gathered from table 1.

The SSV 70 to 79 valves normally are manufactured

in the sizes DN 50 to DN 600 (resp. NVS 2” to NVS

24”). Other sizes are deliverable on request. For

design reasons the pressure loss DpBy

at the

bypass is limited to approx. 80 bar. Other operating

limits and application ranges are equal to the SSV

10 to 20 series.

The Compensating Bypass Check Valve with control

means the non-return cone (3) is kept in his operating

such a way, that the cone reaches its utmost upper

The non-return cone (3) activates the control disc (37)

in the bypass by means of the lever (32). If the cone

is positioned on the cone seat, the control disc (37)

is completely open. It closes corresponding to the

rising of the cone by delivery in main direction. The

necessary for supplement of the required minimum

other hand the bypass opens again, when the main

SSV

DIN ANSI

Typ DN DN

SSV 70 50-80 25-40 8,00 9.36

SSV 71 80-125 40-50 17,40 20.36

SSV 72 100-150 65-80 32,30 37.67

SSV 73 150-250 100-125 60,60 70.90

SSV 74 200-400 125-150 90,00 105.30

SSV 75 250-400 125-150 129,00 150.93

SSV 76 300-500 150-250 180,00 210.60

SSV 77 350-600 200-300 262,50 307.13

SSV 78 350-600 250-350 376,50 440.51

SSV 79 400-600 350-400 585,00 684.45

6

SMVMultifunction Valve

6

device opens because of the dropping differential

pressure, so that developed gas, e.g. by after-heat

in the pump system, will be passed off immediately

the next start or automatic re-start.

The Multifunction Valve SMV is a product innovation,

created with the purpose of eliminating problems,

known from day-to-day practice. This valve improves

plant security and availability through combining

vital functions at competitive prices. The combined

pump protection is achieved by assuring the

in the main delivery stream with the Automatic-

The main application area is in the process enginee-

-

perature engineering, fuel depot engineering, and

Valve can be used in all pump plants delivering

gaseous media and for pumps which are – because

of modern sealing systems or similar devices –

equipped with gas-injections.

Also, the Multifunction Valve SMV will protect split

cage motor pumps (non-seal pumps) and magnetic

pumps from dry operation.

The design is according to standard AD 2000 and

particulary to EN 13445. As required by Pressure

Equipment Directive (PED) 97/23/EG the products

are supplied with CE Marking and Declaration of

Conformity.

category 1 to 4 are covered. Otherwise installation,

mode of operation and construction are as for Type

SSV 10-20.

SMV

SMV

10-12

18/20

SMV

Observations and case studies from practical applica-

tions prove the need for the Schroeder Multifunction

Valve.

Operation breakdowns, damages and other pro-

blems, caused by dry pump operation have often

stations of fuel depots. These problems mostly

occured during times of start-up and re-starts of

pumps.

-

-

ture increase in the stopped pump. This gas volume

or totally with gas. This can be caused by the tem-

after-heat of the pump immediately after disconnec-

tion. Depending on the pump type it will become

impellers cannot build up delivery pressure when

the pump is re-started. Thus the pump operates

dry and seconds later considerable damages occur,

possibly leading to destruction of the pump and

environment.

Schroeder Multifunction Valve provides a continuous

The Schroeder Multifunction Valve SMV is installed

near the pressure connection. Due to the elevated

position a geodetical high reference point is formed

below the non-return cone on the pump pressure side

in main stream direction. During the dwell period of the

machine, the resulting gas is collected in the region of

of the Multifunction Valve is automatically kept in open

position, when the pump is not working. Thus a con-

the machinery is constantly kept in a cold state and

is prepared for a secure start or re-start. Immediately

after start-up the pump produces the required diffe

6

SMV

18/20

Lower body Part-No. 1

Upper body Part-No. 2

Cone Part-No. 3

Cone guide Part-No. 4

Cone guide Part-No. 5

Bypass branch Part-No. 10

Casing Part-No. 12

Rotary slide valve Part-No. 13

Operating lever Part-No. 14

Throttle Part-No. 16

Non-Return Valve Part-No. 17

Degassing branch Part-No. 26

Degassing valve Part-No. 27

Bypass Valve Head, complete Part-No. 60

O-Ring Part-No. 78.1

O-Ring Part-No. 78.2

O-Ring Part-No. 78.3

O-Ring Part-No. 78.4

O-Ring Part-No. 78.5

Socket screw Part-No. 91.1

Socket screw Part-No. 91.2

Dowel pin Part-No. 94.1

Dowel pin Part-No. 94.2

Coil spring Part-No. 95.1

Coil spring Part-No. 95.3

Coil spring Part-No. 95.4

Bypass Valve Head, complete Part-No. 60 consiting of:

Casing Part-No. 12

Rotary slide valve Part-No. 13

Operating lever Part-No. 14

Dowel pin Part-No. 94.1

Dowel pin Part-No. 94.2

Non-Return Valve in the Bypass Branch, complete, consisting of:

Throttle Part-No. 16

Non-Return Valve Part-No. 17

O-Ring Part-No. 78.2

O-Ring Part-No. 78.4

Coil spring Part-No. 95.3

Single Spare Parts

O-Ring Part-No. 78.1

O-Ring Part-No. 78.2

O-Ring Part-No. 78.3

O-Ring Part-No. 78.4

O-Ring Part-No. 78.5

Coil spring Part-No. 95.1

(95.2)

Coil spring Part-No. 95.3

Coil spring Part-No. 95.4

For main dimensions H, S and L see type SSV 18,

H1 and S

1 on request.

SMV

Lower body Part-No. 1

Upper body Part-No. 2

Cone Part-No. 3

Cone guide Part-No. 4

Cone guide Part-No. 5

Bypass branch Part-No. 10

Casing Part-No. 12

Rotary slide valve Part-No. 13

Operating lever Part-No. 14

Throttle Part-No. 15

Degassing branch Part-No. 26

Degassing valve Part-No. 27

Bypass Valve Head, complete Part-No. 60

O-Ring Part-No. 78.1

O-Ring Part-No. 78.2

O-Ring Part-No. 78.3

O-Ring Part-No. 78.4

O-Ring Part-No. 78.5

Socket screw Part-No. 91.1

Socket screw Part-No. 91.2

Dowel pin Part-No. 94.1

Dowel pin Part-No. 94.2

Coil spring Part-No. 95.1

Coil spring Part-No. 95.4

Bypass Valve Head, complete, Part-No. 60 consisting of:

Casing Part-No. 12

Rotary slide valve Part-No. 13

Operating lever Part-No. 14

Dowel pin Part-No. 94.1

Dowel pin Part-No. 94.2

Throttle in the Bypass Branch, consisting of:

Throttle Part-No. 15

O-Ring Part-No. 78.4

Single Spare Parts

O-Ring Part-No. 78.1

O-Ring Part-No. 78.2

O-Ring Part-No. 78.3

O-Ring Part-No. 78.4

O-Ring Part-No. 78.5

Coil spring Part-No. 95.1

(95.2)

Coil spring Part-No. 95.3

Coil spring Part-No. 95.4

For main dimensions H, S and L see type SSV 18,

H1 and S

1 on request.

SMV

7

SSMAAutomatic Minimum Flow System

7

SMA

63/64

upwards and stops at another predetermined position.

During this procedure the cone actuates both control

valves of the pilot unit via the lever (32) and the control

plunger (31).

After control valve 2 closes, control valve 1 opens. For

the medium the passage to the piston (15) in the

by-pass becomes free. The piston forces forward

closes. (Position „OFF“).

100%.

-

wards and switches the two control valves, as soon

bypass opens (Position „ON“) and the pump minimum

prevents a too fast closing of the bypass and con-

sequently a hammering valve piston (15).

Through the clear positions of the bypass („ON“ resp.

protection has been developed, which combines

a very low wear and tear with very high operational

security at highest pressure loads.

The Autonomous Minimum Flow Systems comprise a

split body with non-return cone, bypass and the pilot

unit.

In the standard option the casing for valve and bypass

are of forged steel 1.0460. Cone seat and actuator

control surfaces are stellite-faced. The other parts are

made of suitable stainless steels.

By is passed off via the Bypass.

A piston (15) takes over the closing and opening of

the bypass. Double sealing of the piston in the ring

seat (14) achieves extreme durability of the internal

bypass parts. The following pressure reduction of the

in the bypass.

The pilot unit utilizes the medium and the pump pres-

sure for actuation of the piston (15). Two control valves

control the pump pressure in front of resp. behind the

piston and consequently the position of the piston ON

resp. OFF is regulated. The control valves are actuated

-

(37) a cushioned move of the piston (15) is achieved.

With a pressure indicator on the bypass the function of

the Minimum Flow System can be supervised.

SMASMA

The Automatic Minimum Flow System SMA 63/64

is a protection device for pump protection. It auto-

matically protects centrifugal pumps from damages,

which might occur during operation under low load

conditions because of partial evaporation of the

a predetermined value, the valve opens its bypass,

DIN ANSI

Q Q

803240

180 50 45 13

1004050

280 78 70 19

1255065

440 12270

12019

133

1506580

630 175120180

3350

20080

1001120 311

180280

5078

250100125

1750 486280440

78122

Through actuation of the bypass via a valve control

plunger (15) the bypass can be opened resp. closed

completely. This On-Off-Regulation of the Bypass

makes it possible to increase the load limit from

200 bar to 400 bar. The prefered duty is in the ran-

ge of nominal pressure 250 to 400 bar resp. ANSI

2500 lbs.

power.

7Notes

SMA

63/64

As a special design SMA 64 the system can also be

utilized for speed controlled pumps.

Special attention has been paid to easy main-

tenance. So it is not necessary to dismantle the

of the wearing parts like piston and ring seat.

The hand-operating branch with multi-port throttle

a manually actuated valve combination. We recom-

mend the branch for sparing of the internal bypass

parts at frequent operation in the range of minimum

Two positions are possible:

• D1 in the lower part of the casing with junction

below the cone;

· the bypass remains open

• D2 in the upper part of the casing with junction

above the cone (larger valve length);

-

ge branch etc. can be provided, if so desired. Flange

design acc. to DIN, ANSI, BS, ISO and related stan-

dards are possible.

We recommend installation directly on the pump

installation is from bottom to top, when installed ver-

tically.

In order to avoid vibrations in the valve and the pipe

lines we recommend to continue the connecting

line at the outlet (DN2) and the bypass branch

(DN3) for approx. 2-3 m in the chosen nominal bore.

A pipe bend directly to the bypass branch should be

avoided.

AD 2000 and particularly to EN 13445. As per Pres-

sure Equipment Directive 97/23 EG the products are

provided with the CE marking and the Declaration

H1 (Pressure Equipment Directive 97/23 EG) all

dangerous material classes of category 1 to 4 are

covered.

SMA

7SMA

SMA

63

7SMA

SMA

64

8

SR/SAHigh Pressure Control

Valve

8

SR/SAASME or welding ends in a standard range of DN

25 - DN 150 / NPS 1“ – NPS 6“. Other nominal sizes

are possible on request.

The following valve characteristics are available:

linear, square, equal percentage and on/off.

Valves can be equipped with all common types of

actuators (electrically, pneumatically, hydraulically

actuated). Valves with on-/off-regulation can also be

delivered self actuated, i.e. without external power

Depending on the medium, the valve body is made

of ferritic, austenitic or austenitic-ferritic (duplex)

steel.

particularly to EN 13445. As per Pressure Equipment

Directive 97/23 EG the valves are provided with

the CE marking and the Declaration of Conformity.

Equipment Directive 97/23 EG) all dangerous

material classes of category 1 to 4 are covered.

Max. Design: 600 bar/400 °C

Pressure drop:

Nominal sizes:DN 25 - DN 150(> other sizes on request)

Connection end:

Characteristics: on/off, linear, square, equal-%

Actuators:electric, pneumatic, hydraulic self operated

Body style: Angle- or Z-type

Body materials:

carbon steelDIN EN 10222-2stainless steelDIN EN 10222-5duplex steelDIN EN 10222-5

Inner Parts: chrome steel

Gaskets:· Body· Inner gaskets

metal to metal ceiling

PTFE-pressure sleeveT > 160 ° Graphit

SR/SASR/SA

The SR/SA-type is a High-Pressure control valve for

liquids. It is designed for simple on-/off-regulation

(SR-type). Mainly it‘s utilised for the following

applications:

• feed water control

• injection systems

• process control

In case of pump protection the SR/SA-type is highly

associated with modern process control and monito-

adjusted to customers resp. plant requirements.

With the check back signal of the positioner (or other

available sensors) the valve can be usefully integrated

in every process control/monitoring system. In that

way the SR/SA-valve enlarges the Schroeder portfolio

to control valves and allows pump users to lower their

energy and maintenance costs.

Referring to the increasing pressure/temperature

neering the valves are designed for pressures up

to pA = 600 bar / 8700 psi and temperatures of

TA = 400 °C / 750 °F. With up to 10 controlled throt-

8700 psi can be handled troublefree.

9

SSDMulti-Port Throttle

9

SSD

SSD

The Multi-Port Throttles are used to reduce the

Multi-Port Throttles are available for sizes from DN

20 up to DN 500 and pressure ratings up to PN 640

and ANSI 2500 and for medium temperature up to

300 °C.

The standard material for casing is 1.0460 (P250GH

similar to ASTM A105) and for the throttles 1.4581.

On request casings can be supplied of different

high-grade steel qualities. The design is according

to standard AD 2000 and particularly to EN 13445.

As required by Pressure Equipment Directive

(PED) 97/23/EG the products are supplied with CE

module H1 all dangerous classes of category 1 to 4

are covered.

The pictures above show the available versions of

our Multi-Port Throttles. If you have any questions

do not hesitate to contact us – it is our pleasure to

help you solving your technical problem.

Notes

10

SDVBack Pressure Device

bar

SDVBack Pressure Device

SDV

Range of application

The SDV is a back pressure device, which keeps

the static pressure within the pipeline above a

minimum value without reference to

rate. That means, the pressure will not fall below the

given minimum value over the whole operating range.

Normally back pressure devices are used to avoid

cavitation and partial evaporation in the pipeline.

Due to the increased pressure level in the protected

plant section they prevent a lower deviation from the

local vapor pressure. The SDV has an integrated

non return-valve function, i.e. the piping is also

w.

Mode of operation

The function of the SDV is based on a spring loaded

cone. Cone and spring are adjusted in a way,

that the force of the static pressure lifts the cone

of the seat and does not allow a rate before

reaching the minimum pressure value. Compared

with other pressure devices the Schroeder SDV has a

ehtfoaeragnilttorhtehttahtos,mirtgnitaluger

cone seat is attuned to the current w. With this

design feature the tendency of spring loaded shut-off

cones to hammer at low rate is minimized. So

the SDV is suitable for plants with large range

and frequent part load condition, too.

Technical data

The Schroeder pressure device is manufactured in

the nominal sizes DN 25 – DN 200 / NPS 1“ – NPS 8“,

for pressure ratings up to PN 400 / ANSI 2500 and

a max. operating temperature of 400 °C / 750 °F.

Higher pressure ratings are possible on request. The

body is normally made of 1.0460 / ASTM

SA105. Referring to medium, several alloyed steels

are also deliverable. The regulating trim is made of

Cr-steel or aluminium-bronze.

Design

The design is according to AD 2000 and

particularly to EN 13445. As per Pressure Equipment

Directive 97/23 EG the SDV is provided with the CE

marking and the Declaration of Conformity.

according to the Module H1 (Pressure Equipment

Directive 97/23 EG) all dangerous material

classes of category 1 to 4 are covered.

SDV – Schroeder Back Pressure Device

look at info

overview

up to

Johannesburg Tel : 011-397 2833

Fax : 011-397 4700

E-mail : [email protected]

Durban Tel : 031-579 2593

Fax : 031-579 2562

E-mail : [email protected]

www.valve.co.zaV

R


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