14
콘트롤밸브 콘트롤밸브 적용기술 적용기술 1. 서론 2. 콘트롤 밸브 종류 3. 콘트롤 밸브 선정 4. 콘트롤 밸브 선정절차 5. 보조기기 6. Cavitation& Flashing 7. 설치 8. 유지보수
1.
2.
3.
4.
5.
6. Cavitation & Flashing
7.
8.
1. 1. ? Control Valve ?
: Controller (MV) ,
? Control Valve
- ,,
- ,
? Control Valve
: (Body), (Actuator), (Accessary)
Comparison Computation Control Valve Process
Measurement
ControllerController
SP
PV
MV
DisturbanceActuatorActuator
SensorSensor
AIR CONNECTOR
DIAPH.UP CASE
DIAPHRAGM PLATE
DIAPHRAGM
DIAPH.LOW CASE
LOCK NUT
DIAPH.WASHER
SPRING PLATE
LOCK BOLT
SPRING
ACT. STEM
ADJUST SCREW
INDICATOR
STUD BOLT
GLAND FLANGE
VALVE STEM
PACKINGGLAND
YOKE
POSITIONER
CLAMP
YOKE NUT
NUT
SEAT RING
GASKET
BODY
GUIDE
PORT
BONNET
Control Valve
Body
Actuator
Accessary
2.2. ?
? , , , ,
,
. (Trim) (Linear Motion Valve)
, , , , (Rotary Motion Valve)
, ,
. , Y Type , , , , , ,
. ,
(Trim) On-Off
(On-Off) : , , (Throttle) : , : 3-Way , 4-Way ,
.
(Manual Valve)
Hand Wheel Type, Hand Lever Type, Warm Gear Type
(Control Valve)
, , , ,
(Self Actuating Valve) : ,
- - -, -
-
-
- - - - -
-
-
-
-
-
-
-
-
-2
-
-
-
-
-
- 60
-, - - - -
- - - - -
-- - -
-
-
.
? 0.2 1.0 kg/
?
:
Positioner
?
? (POSCO )
? 4 20 mA
? On-Off
? Positioner
?
? /
3. 3. ControlControl ?
: , ,
?
.
?
? 1)
,
2)
3)
4) , ,
5) , ( ) (, ) ()
6) () : , , , : , , : , , : ,
7) (Rangeability) . .
8) . . 0.3 ~ 0.5
9) . (Shut-Off) , . .
10) . : ANSI B16 104 ( Cv % )
11) 2 . , (Air To Close)
(Air To Open)
(Maker Recommend)
Cv 0.5%
Cv 0.1%
Cv 0.01%
510-4 D Pcc/min
-
3.5Bar
3.5 Bar
Class
Class
Class
Class
Class
Class
Test FluidClass
12) , , , , ,
13)
14)
15) Valve
, ,
?ISA 45 0.9 m(3ft)
? , 90dBA, SPL 8
16)
,
,
17)
, ,
