Warren Controls PICV Series - Manual (Page 29)

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PRESSURE INDEPENDENT CONTROL VALVE PICV_IOM_REVF_0114
PICV DIAPHRAGM ACTUATOR
REMOVAL FROM VALVE
1. Remove line pressure and isolate PICV valve in piping.
2. Remove upstream port and downstream port pressure sensing
lines from connections on diaphragm actuator (See drawing
C3121902).
3. Connect flexible temporary air connection to upstream port
pressure sensing connection on diaphragm actuator. Apply air
pressure and increase until actuator stem begins to retract into
actuator.
4. Loosen yoke locknut then unthread it from valve body assembly.
5. Reduce air pressure to upstream port pressure sensing connection
to 0 psig (0 BARG). Remove temporary air connection.
6. Use wrench on flats of actuator stem to keep actuator stem from
turning. Loosen two jamnuts on valve stem so they are not in
contact with actuator stem. Tighten two jamnuts together on
valve stem.
7. Looking down on top of actuator, rotate actuator counterclockwise
to unthread actuator stem from valve stem. Use wrench on
jamnuts on valve stem to keep valve stem from turning. Continue
rotating actuator until actuator stem is completely unthreaded
from valve stem. Rotating the actuator stem relative to the
actuator will damage the diaphragm and void the warranty.
The diaphragm-actuated section of the PICV valve is reverse
acting. The plug is on the seat when the valve stem is fully up
(not down). Do not turn the valve stem if the plug is in contact
with the seat. Rotating the valve stem with the plug on the
seat will destroy the seating surfaces and void the warranty.
8. Remove actuator and yoke locknut from the valve.
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PICV DIAPHRAGM ACTUATOR MOUNTING
ON VALVE
1. Remove line pressure and isolate PICV valve in piping.
2. Push valve stem down until plug reaches travel stop in valve.
3. Thread two valve stem jamnuts onto valve stem. With valve stem
down and plug at travel stop in valve, position jamnuts on valve
stem so the distance from the actuator yoke mounting surface of
the valve bonnet to the top of the jamnuts is 2.438 inch (6.193 cm).
Tighten jamnuts together.
4. Place yoke locknut on actuator yoke tapered side up.
5. Place actuator with yoke locknut over valve stem.
6. Engage actuator stem with valve stem. Looking down on top of
actuator, rotate actuator clockwise to thread actuator stem onto
valve stem. Continue rotating actuator until actuator stem is in
contact with jamnuts on valve stem. If necessary lift actuator
slightly and use wrench on jam nuts on valve stem to thread
valve stem into actuator stem. Use wrench on jamnuts on valve
stem to tighten valve stem to actuator stem. Use wrench on flats
on actuator stem to keep actuator stem from turning. Rotating
the actuator stem relative to the actuator will damage the
diaphragm and void the warranty. The diaphragm-actuated
section of the PICV valve is reverse acting. The plug is on the
seat when the valve stem is fully up (not down). Do not turn
the valve stem if the plug is in contact with the seat. Rotating
the valve stem with the plug on the seat will destroy the
seating surfaces and void the warranty.
7. Connect flexible temporary air connection to upstream port
pressure sensing connection on diaphragm actuator (See
drawing C3121902 for location of upstream port pressure sensing
connection). Apply air pressure and increase until actuator yoke
firmly contacts mounting boss of valve. Orient actuator with
pressure sensing line connections facing PICV electric motor
actuator or so existing pressure sensing line connections can
be reconnected. Rotating the actuator stem relative to the
actuator will damage the diaphragm and void the warranty.
The diaphragm-actuated section of the PICV valve is reverse
acting. The plug is on the seat when the valve stem is fully up
(not down). Do not turn the valve stem if the plug is in contact
with the seat. Rotating the valve stem with the plug on the
seat will destroy the seating surfaces and void the warranty.
8. Thread yoke locknut onto valve bonnet. Tighten yoke locknut
securely. Use a blunt chisel and hammer for final tightening.
Reduce air pressure to upstream port pressure sensing connection
to 0 psig.
9. If it is necessary to adjust the set differential pressure
complete Steps 4 thru 10 of the PICV Set Differential Pressure
Adjustment instructions.
10. Install upstream port and downstream port pressure sensing lines
(See drawing D3121311 (Sizes 2-1/2 thru 4 inch, P2 thru P4) or
C3121900 (Sizes 5 thru 10 inch, P5 thru P1) for orientation
of upstream port and downstream port pressure sensing
lines).
11. Return line pressure to valve.