DEMCO Butterfly ValvesThe Resilient Seated Butterfly Valve of Choice for a Wide Variety

of Applications within the Oilfield and Industrial Industries

TC1465© Cooper Cameron Corporation

Cooper Cameron Valves DivisionPrinted in Canada 12/03

I N L I N E L A U N C H E RP O W E R

G E N E R A T I O NC H E M I C A L

P R O C E S S I N GO F F S H O R E

J A C K U P R I G

Dry Stem JournalEliminates PotentialFor LeakageThe DEMCO disc is uniquelydesigned with a continuousannular raised land around thestem hole and disc edge, whichpresses into the seat flat at everyangular position. The resilient seatpresses back with a higherspecific force than the linepressure, preventing leakage tothe stem. In addition, two O-ringribs are provided in the seat stembore creating a triple stem seal.

In competitive stem seal designswith boot seats, a seal is accom-plished by an interference“squeezing” on the stem or an O-ring in the stem journal. Thepotential for leakage behind the

seat with this design is high. Asthe disc wipes the seat, elonga-tion of the stem seal area allowsleakage to collect behind theseat. This condition is eliminatedby DEMCO’s dry stem journal

and hard-backed seat.

End-of-Line ServiceLug body valves may be used inend-of-line service, with down-stream piping removed. (Onlyweld neck or socket flanges canbe used for this service.) Sinceupstream pressure is excludedbetween the flange and the seat

face by the exclusive DEMCOflange seal design, there is noeffective force to slide the seatdown-stream. DEMCO 2”–12”Lug Butterfly Valves are suitablefor liquid service up to 200 psiwith downstream piping re-moved (150 psi 14”–36”).

Lug body valves are recom-mended for isolation of pumps,control devices or other systemcomponents which may need tobe removed for repair or replace-ment. Lug valves are alsosuitable for installation at pointsfrom which piping expansionmay proceed. Such valves arenormally blanked with blindflanges to protect the exposedseats until new piping is at-

tached.

P R O D U C T P R O F I L E

SIZES2”– 48”

BODY TYPE & STYLE DESIGNATIONSLong Neck NE-C and NF-C: 2”– 48”,

2”-36” wafer / lug, 42” – 48” flangedShort Neck NE-I, NE-I Sanitary:

2”– 12”, wafer / lugNEI-T Teflon: 2” – 10” wafer / lugNE-D: 2”-12” wafer notched bodyMarine: 2” – 24” wafer / lug

PRESSURE RATING2” – 12”: 0 (Throttling), 50, 200, 285 psi2” – 10” NEI-T: 150 psi14” – 48”: 0, 50 and 150 psi

OPERATING TEMPERATURES-30°F to +300°F (-34°C to +204°C) depending

on seat material selection and application

STANDARD MATERIAL OPTIONS*Bodies: Iron, Steel, Stainless Steel and BronzeDiscs: Nickel Plated Ductile Iron, Bronze and

Stainless SteelStems: 416 and 316 Stainless SteelSeats: Buna N, EPT, Viton, and Neoprene*Many more options available: consult factory or

valve catalog

DEMCO Butterfly Valve FeaturesFlatted “double D” upper stem

Large flange top for easeof power automation.(Full line of actuation andaccessories offered.)

Blowout proof stems

MSS SP-25 marking isstandard.

Triple stem seal

High flow disc

One piece body

DEMCO NE-C Wafer syle shown

Bronze bearings

Positivelyoriented disc

Hard backedcartridge seat(2”– 36”)

B

U

T

T

E

R

F

L

Y

V

A

L

V

E

S

16500 South MainMissouri City Texas 77489281 499 8511800 323 9160www.ccvalve.com

USACooper Cameron ValvesMissouri City, TXPhone: 281-499-8511Fax: 281-261-3588

Cooper Cameron ValvesOklahoma City, OklahomaPhone: 405-631-9444Fax: 405-616-2586

UKCooper Cameron ValvesLivingston, ScotlandPhone: 44-1506-444000Fax: 44-1506-441320

CANADACooper Cameron Canada CorporationCalgary, AlbertaPhone: 403-398-9930Fax: 403-398-9936

Cooper Cameron Canada CorporationEdmonton, AlbertaPhone: 780-435-0777Fax: 780-435-0700

MEXICOCooper Cameron de Mexico S.A. de C.V.Mexico CityPhone: 52-555-580-0296Fax: 52-555-395-8669

ARGENTINACameron Argentina S.A.I.C.Zarate, Pica Buenos AiresPhone: 54-3487-421912/422697Fax: 54-3487-423404

SINGAPORECooper Cameron (Singapore) Pte. Ltd.Phone: 65-6861-3355Fax: 65-6861-6197

FRANCECameron France, S.A.Beziers, FrancePhone: 33-4-67-111-500Fax: 33-4-67-111-600

OTHERLOCATIONSAustriaAustraliaBrazilBruneiChileCongoEgyptEnglandGabonGermanyHungaryIndonesiaIrelandJapanMalaysiaNetherlandsNew ZealandNigeriaNorwayOmanPolandQatarRussiaSaudi ArabiaUAEVenezuela

Bi-Directional SealingThis valve provides bi-directional

sealing at full-rated pressure with

identical flow-way from either face.

Integral Flange SealMolded into the edge of the seat is an

integral flange seal which accommo-

dates ANSI weld neck, slip-on,

threaded and socket flanges as well

as “stub end” type C flanges.

ANSI Class 150 RatingBody rating is ANSI class 150 (285 psi

non-shock). Wafer body diameters are

designed to self-center in ANSI 150

flange patterns.

Multiple Pressure RatingsThree drop tight pressure ratings are

offered for 2” to 12” sizes. The stan-

dard shut off pressure rating is 200

psi, but 285 and 50 psi shut off ratings

are also available. And, where drop

tight closure is not required and

minimal torque is desired, a throttling

rated valve is available. Both the 50 psi

and throttling ratings allow for smaller

actuators, which can significantly

reduce overall installation cost in

automated applications. The 14” to

48” size valves are available in 150

and 50 psi drop tight shut off ratings

as well as throttling.

Positively Oriented DiscProper orientation of the stem/disc

connection is assured by the rectangu-

lar drive. The disc is permitted to float

on the stem to perfectly center in the

valve seat. This design enhances drop

tight sealing and prolongs service life.

Hard-Backed Cartridge Seat(2”–36”)

The DEMCO

cartridge seat is

constructed by

permanently

bonding a

resilient elastomer to a rigid backing

ring. In addition to superior sealing

integrity, this design: 1) makes valve

installation easier because no special

precautions are required for disc

position. This is especially advanta-

geous when installing valves with fail

closed actuators; 2) eliminates high

torque and premature failure caused

by elastomer distortion as found in

other butterfly valve brands with non-

rigid seat design; 3) simplifies seat

replacement because it is slip fitted

into the body, with no need for special

tools.

The DEMCO

Advantage...T

H

E

D

E

M

C

O

A

D

V

A

N

T

A

G

E

Acclaimed as themost durable of allresilient-seatedbutterfly valves inthe industry,DEMCO butterflyvalves excel ina wide variety ofapplications.

Cast in both wafer andtapped-lug patterns in awide variety of materialchoices, DEMCO butterflyvalves feature a one-piecebody for minimum weightand maximum strength.The unique stem holedesign in the disc ensuresa dry stem journal, and thehard-backed seat (2”–36”)allows ease of installation,reliable operation, and isfield-replaceable withoutspecial tools. DEMCObutterfly valves are availablein sizes 2” through 48”.

Engineered for long-term,maintenance-free perfor-mance, DEMCO butterflyvalves are commonlyselected for a variety ofapplications spanning awide range of industries:• Chemical and petro- chemical• Agriculture• Oil and gas drilling and production• Food and beverage• Water and waste water• Cooling towers (HVAC)• Power• Mining and materials• Dry bulk handling• Marine and government

Handles and StemExtensionsThree basic handle designs inter-change on any 2" to 12" valves: tenposition locking, two position lockingand memory stop. Memory-stophandles provide throttling capabilitywhich is infinitely adjustable and canbe set by a lock nut with memory-stop setting (adjustable open stop).Handles are available in basic trim,corrosion-resistant trim and sanitarytrim. Stem extensions are fabricatedfrom carbon steel parts and con-tained in a tubular housing. Gasketsand O-rings seal the stem extensionat top and bottom. These extensionsare fabricated to customer specifiedlengths.

ActuatorsDEMCO Series DR pneumatic actuators are available indouble-acting or fail-safe, spring return models. Series DRactuators are compact, high-torque, piston actuators. Series Rdiaphragm actuators incorporate a heavy-duty, enclosedrack-and-pinion linkage. Diaphragm actuators are suitable forlow-pressure, pneumatic service. Electric actuators are usedwhen compressed air is not available for pneumatic operation.

Gear operatorsDEMCO weatherproof gear operators areoffered with a choice of handwheel,chain-wheel, or square nut. The wormgearing has self-locking set screws tocontrol open and closed positioning oran optional adjustable memory stop for“balance return” to a preset openposition after closing.

DEMCO NE-C wafer withSeries DR actuator

Series R diaphragmactuator

Electric actuator

Stem extensionwith handle on

Series NE-Ibutterfly valve Gear operator

Dry Stem JournalEliminates PotentialFor LeakageThe DEMCO disc is uniquelydesigned with a continuousannular raised land around thestem hole and disc edge, whichpresses into the seat flat at everyangular position. The resilient seatpresses back with a higherspecific force than the linepressure, preventing leakage tothe stem. In addition, two O-ringribs are provided in the seat stembore creating a triple stem seal.

In competitive stem seal designswith boot seats, a seal is accom-plished by an interference“squeezing” on the stem or an O-ring in the stem journal. Thepotential for leakage behind the

seat with this design is high. Asthe disc wipes the seat, elonga-tion of the stem seal area allowsleakage to collect behind theseat. This condition is eliminatedby DEMCO’s dry stem journal

and hard-backed seat.

End-of-Line ServiceLug body valves may be used inend-of-line service, with down-stream piping removed. (Onlyweld neck or socket flanges canbe used for this service.) Sinceupstream pressure is excludedbetween the flange and the seat

face by the exclusive DEMCOflange seal design, there is noeffective force to slide the seatdown-stream. DEMCO 2”–12”Lug Butterfly Valves are suitablefor liquid service up to 200 psiwith downstream piping re-moved (150 psi 14”–36”).

Lug body valves are recom-mended for isolation of pumps,control devices or other systemcomponents which may need tobe removed for repair or replace-ment. Lug valves are alsosuitable for installation at pointsfrom which piping expansionmay proceed. Such valves arenormally blanked with blindflanges to protect the exposedseats until new piping is at-

tached.

P R O D U C T P R O F I L E

SIZES2”– 48”

BODY TYPE & STYLE DESIGNATIONSLong Neck NE-C and NF-C: 2”– 48”,

2”-36” wafer / lug, 42” – 48” flangedShort Neck NE-I, NE-I Sanitary:

2”– 12”, wafer / lugNEI-T Teflon: 2” – 10” wafer / lugNE-D: 2”-12” wafer notched bodyMarine: 2” – 24” wafer / lug

PRESSURE RATING2” – 12”: 0 (Throttling), 50, 200, 285 psi2” – 10” NEI-T: 150 psi14” – 48”: 0, 50 and 150 psi

OPERATING TEMPERATURES-30°F to +300°F (-34°C to +204°C) depending

on seat material selection and application

STANDARD MATERIAL OPTIONS*Bodies: Iron, Steel, Stainless Steel and BronzeDiscs: Nickel Plated Ductile Iron, Bronze and

Stainless SteelStems: 416 and 316 Stainless SteelSeats: Buna N, EPT, Viton, and Neoprene*Many more options available: consult factory or

valve catalog

DEMCO Butterfly Valve FeaturesFlatted “double D” upper stem

Large flange top for easeof power automation.(Full line of actuation andaccessories offered.)

Blowout proof stems

MSS SP-25 marking isstandard.

Triple stem seal

High flow disc

One piece body

DEMCO NE-C Wafer syle shown

Bronze bearings

Positivelyoriented disc

Hard backedcartridge seat(2”– 36”)

Bi-Directional SealingThis valve provides bi-directional

sealing at full-rated pressure with

identical flow-way from either face.

Integral Flange SealMolded into the edge of the seat is an

integral flange seal which accommo-

dates ANSI weld neck, slip-on,

threaded and socket flanges as well

as “stub end” type C flanges.

ANSI Class 150 RatingBody rating is ANSI class 150 (285 psi

non-shock). Wafer body diameters are

designed to self-center in ANSI 150

flange patterns.

Multiple Pressure RatingsThree drop tight pressure ratings are

offered for 2” to 12” sizes. The stan-

dard shut off pressure rating is 200

psi, but 285 and 50 psi shut off ratings

are also available. And, where drop

tight closure is not required and

minimal torque is desired, a throttling

rated valve is available. Both the 50 psi

and throttling ratings allow for smaller

actuators, which can significantly

reduce overall installation cost in

automated applications. The 14” to

48” size valves are available in 150

and 50 psi drop tight shut off ratings

as well as throttling.

S T Y L E S A N D A C C E S S O R I E S

Positively Oriented DiscProper orientation of the stem/disc

connection is assured by the rectangu-

lar drive. The disc is permitted to float

on the stem to perfectly center in the

valve seat. This design enhances drop

tight sealing and prolongs service life.

Hard-Backed Cartridge Seat(2”–36”)

The DEMCO

cartridge seat is

constructed by

permanently

bonding a

resilient elastomer to a rigid backing

ring. In addition to superior sealing

integrity, this design: 1) makes valve

installation easier because no special

precautions are required for disc

position. This is especially advanta-

geous when installing valves with fail

closed actuators; 2) eliminates high

torque and premature failure caused

by elastomer distortion as found in

other butterfly valve brands with non-

rigid seat design; 3) simplifies seat

replacement because it is slip fitted

into the body, with no need for special

tools.

The DEMCO

Advantage...T

H

E

D

E

M

C

O

A

D

V

A

N

T

A

G

E

Acclaimed as themost durable of allresilient-seatedbutterfly valves inthe industry,DEMCO butterflyvalves excel ina wide variety ofapplications.

Cast in both wafer andtapped-lug patterns in awide variety of materialchoices, DEMCO butterflyvalves feature a one-piecebody for minimum weightand maximum strength.The unique stem holedesign in the disc ensuresa dry stem journal, and thehard-backed seat (2”–36”)allows ease of installation,reliable operation, and isfield-replaceable withoutspecial tools. DEMCObutterfly valves are availablein sizes 2” through 48”.

Engineered for long-term,maintenance-free perfor-mance, DEMCO butterflyvalves are commonlyselected for a variety ofapplications spanning awide range of industries:• Chemical and petro- chemical• Agriculture• Oil and gas drilling and production• Food and beverage• Water and waste water• Cooling towers (HVAC)• Power• Mining and materials• Dry bulk handling• Marine and government

This versatile valve comes in avariety of styles to suit an evenwider range of applications. Inaddition, a variety of qualityaccessories are available tofurther enhance its suitability tothe application.

Series NE-CSizes 2" to 12", thisseries is a generalpurpose valve withneck lengthdesigned toprovide full clear-ance of the valvetop over two inchesof insulation onANSI 150 pipe

flanges; available in both wafer andlug styles.

Series NE-ISizes 2" to12", it issuited for awide rangeof applica-tions inmanyindustries,

including food and beverage utilitiesand process flow lines. This shortneck design is offered in a widevariety of body materials. The valvesare designed for installation betweenANSI 125/150 flanges.

Series NE-DSizes 2" to12", it is ashort neckvalve withbodynotches to fitpopularlightweight

flange patterns, making it ideal for

bulk material handling and thetransportation industry. Valves willalso center in ANSI 125/150 flanges.

Series NF-C(14" - 48")

Sizes 14" to 36" areavailable in bothwafer and lugstyles. The waferbody has twodrilled locator lugsat top and bottomfor ANSI 150flanges. 42” and48” sizes areavailable withflanged bodies.On all sizes bronzebearings areinstalled on bothstems for mini-mum operatingtorque.

Series NE-ISanitarySizes 2" - 12", itis similar to ourSeries NE-Ivalve, but isexclusivelydesigned tomeet therigorousrequirements ofsanitary servicein the food andbeverage

industry. The body is available inbronze, stainless steel, aluminum orelectroless nickel-coated ductile iron.FDA - approved materials are usedfor all wetted parts. Handle parts are

bronze and stainless steel, permittingcaustic washdown.Other benefits:• DEMCO dry journal stem sealsystem gives absolute assurance ofsanitary butterfly valve construction.• Drilled passageways, a designoriginated by DEMCO, vent the entireinterior of the disc to atmosphere. Noclosed chamber is provided for theculture of undesirable organisms.• Discs are produced from invest-ment castings, smooth and non-porous. Stem bosses are minimizedfor increased flow.• The projecting inner surface of theresilient seat contacts and is com-pressed by the mating flange to forma smooth and uninterrupted flow way.This positive seal between theinnermost contact of the seat andflange ensure aseptic conditions aftera piping flush.

Series NEI-T TeflonBecause of the inert, aseptic non-stick character of Teflon, DEMCO’sNEI-T Teflon-lined butterfly valve isideal for “clean” lines in food andbeverage plants. The Teflon seatconsists of a virgin Teflon lineroverlaying and bonded to an elas-tomer cushion (either Buna-N or EPTare available) which provides resil-ience for sealing. The Teflon linerextends over the seat faces, com-pletely covering and sealing theresilient material from contact withline fluids.

MarineDEMCO Marine butterfly valves areavailable in the NE-C & NF-C Lug,NE-I Lug and Wafer and NE-D Waferstyles and conform to Title 46 of theCode of Federal Regulations, Part 56of the U.S. Coast Guard’s MarineEngineering Regulations as well asthe American Bureau of ShippingStandard including tagging per MSS-SP-25 and testing per MSS-SP-67.

Series NF-C 16”

Series NF-C 30”

Handles and StemExtensionsThree basic handle designs inter-change on any 2" to 12" valves: tenposition locking, two position lockingand memory stop. Memory-stophandles provide throttling capabilitywhich is infinitely adjustable and canbe set by a lock nut with memory-stop setting (adjustable open stop).Handles are available in basic trim,corrosion-resistant trim and sanitarytrim. Stem extensions are fabricatedfrom carbon steel parts and con-tained in a tubular housing. Gasketsand O-rings seal the stem extensionat top and bottom. These extensionsare fabricated to customer specifiedlengths.

ActuatorsDEMCO Series DR pneumatic actuators are available indouble-acting or fail-safe, spring return models. Series DRactuators are compact, high-torque, piston actuators. Series Rdiaphragm actuators incorporate a heavy-duty, enclosedrack-and-pinion linkage. Diaphragm actuators are suitable forlow-pressure, pneumatic service. Electric actuators are usedwhen compressed air is not available for pneumatic operation.

Gear operatorsDEMCO weatherproof gear operators areoffered with a choice of handwheel,chain-wheel, or square nut. The wormgearing has self-locking set screws tocontrol open and closed positioning oran optional adjustable memory stop for“balance return” to a preset openposition after closing.

DEMCO NE-C wafer withSeries DR actuator

Series R diaphragmactuator

Electric actuator

Stem extensionwith handle on

Series NE-Ibutterfly valve Gear operator

alvesalve of Choice for a Wide Variety

TC1465© Cooper Cameron Corporation

Cooper Cameron Valves DivisionPrinted in Canada 12/03

I N L I N E L A U N C H E RP O W E R

G E N E R A T I O NC H E M I C A L

P R O C E S S I N GO F F S H O R E

J A C K U P R I G

Dry Stem JournalEliminates PotentialFor LeakageThe DEMCO disc is uniquelydesigned with a continuousannular raised land around thestem hole and disc edge, whichpresses into the seat flat at everyangular position. The resilient seatpresses back with a higherspecific force than the linepressure, preventing leakage tothe stem. In addition, two O-ringribs are provided in the seat stembore creating a triple stem seal.

In competitive stem seal designswith boot seats, a seal is accom-plished by an interference“squeezing” on the stem or an O-ring in the stem journal. Thepotential for leakage behind the

leakage to collect behind the

by DEMCO’s dry stem journal

and hard-backed seat.

End-of-Line Service

end-of-line service, with down-stream piping removed. (Only

be used for this service.) Since

P R O D U C T P R O F I L E

SIZES2”– 48”

BODY TYPE & STYLE DESIGNATIONSLong Neck NE-C and NF-C: 2”– 48”,

2”-36” wafer / lug, 42” – 48” flangedShort Neck NE-I, NE-I Sanitary:

2”– 12”, wafer / lugNEI-T Teflon: 2” – 10” wafer / lugNE-D: 2”-12” wafer notched bodyMarine: 2” – 24” wafer / lug

PRESSURE RATING2” – 12”: 0 (Throttling), 50, 200, 285 psi2” – 10” NEI-T: 150 psi14” – 48”: 0, 50 and 150 psi

OPERATING TEMPERATURES-30°F to +300°F (-34°C to +204°C) depending

on seat material selection and application

STANDARD MATERIAL OPTIONS*Bodies: Iron, Steel, Stainless Steel and BronzeDiscs: Nickel Plated Ductile Iron, Bronze and

Stainless SteelStems: 416 and 316 Stainless SteelSeats: Buna N, EPT, Viton, and Neoprene*Many more options available: consult factory or

valve catalog

Bronze bearings

Positivelyoriented disc

Hard backedcartridge seat(2”– 36”)

16500 South MainMissouri City Texas 77489281 499 8511800 323 9160www.ccvalve.com

USACooper Cameron ValvesMissouri City, TXPhone: 281-499-8511Fax: 281-261-3588

Cooper Cameron ValvesOklahoma City, OklahomaPhone: 405-631-9444Fax: 405-616-2586

UKCooper Cameron ValvesLivingston, ScotlandPhone: 44-1506-444000Fax: 44-1506-441320

CANADACooper Cameron Canada CorporationCalgary, AlbertaPhone: 403-398-9930Fax: 403-398-9936

Cooper Cameron Canada CorporationEdmonton, AlbertaPhone: 780-435-0777Fax: 780-435-0700

MEXICOCooper Cameron de Mexico S.A. de C.V.Mexico CityPhone: 52-555-580-0296Fax: 52-555-395-8669

ARGENTINACameron Argentina S.A.I.C.Zarate, Pica Buenos AiresPhone: 54-3487-421912/422697Fax: 54-3487-423404

SINGAPORECooper Cameron (Singapore) Pte. Ltd.Phone: 65-6861-3355Fax: 65-6861-6197

FRANCECameron France, S.A.Beziers, FrancePhone: 33-4-67-111-500Fax: 33-4-67-111-600

OTHERLOCATIONSAustriaAustraliaBrazilBruneiChileCongoEgyptEnglandGabonGermanyHungaryIndonesiaIrelandJapanMalaysiaNetherlandsNew ZealandNigeriaNorwayOmanPolandQatarRussiaSaudi ArabiaUAEVenezuela