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MODEL 700 CONTROL VALVE
6. With the piston in a vertical position, nose end down, place the O-ring into the
groove on the piston. (If the valve is a high-pressure model, the piston will require
PTFE backup rings on either side of the O-ring.)
7. Place the indicator stem retaining ring into the counter bore of the piston. Place the
washer on top of the indicator stem retaining ring. Using retaining ring pliers, place
the retaining ring on top of the washer.
8. Insert the piston into the cylinder, nose end down.
9. Insert the spring into the piston.
10. Turn the jack-out screws in the cylinder head to their original position.
11. Place the O-ring into the groove in the cylinder head.
12. Place the cylinder head on top of the spring, and use an arbor press against the top
of the cylinder head to press the spring into the cylinder.
CAUTION
SPRING PRESSURE HAZARD
Follow the instructions in
Step 12
.
Failure to comply may cause force to release the spring, resulting in serious injury
or equipment damage.
13. Align the holes in the cylinder head with the mating holes in the cylinder and insert
the screws into the holes in the cylinder head. Tighten the screws using an Allen
wrench.
14. Remove the cylinder assembly from the arbor press.
15. Place the O-rings into the grooves in the outside of the cylinder.
16. Holding the cylinder assembly by the cylinder head, place the cylinder assembly
into the valve body, aligning the holes in the cylinder head with the mating studs in
the valve body. Tighten the nuts that secure the cylinder head to the valve body.
If your valve does not have a position indicator, you have finished reassembling your
valve.
17. Reconnect tubing to center of the cylinder head.
Reassembly of a control valve with a visual position indicator
Procedure
1. Place the valve in a vertical position with the cylinder head up. Place the indicator
stem into the center hole in the cylinder head, and press it into the retaining ring in
the piston. You may have to wiggle the indicator stem a little to get it into position.
When the indicator stem is in position, you will not be able to pull it out.
2. Place the magnets onto the indicator stem, and retain the magnets by placing the
retaining ring on the indicator stem.
3. Coat the threads of the indicator adapter with pipe sealant, and place the indicator
adapter over the indicator stem, and screw it into the cylinder head. The connection
for the tubing should face upwards.
4. Place the ring magnet on the indicator adapter.
5. Place the indicator housing over the indicator adapter, and secure it with the
indicator top and screw.
User manual
Planned maintenance
P/N 3-9008-553
November 2020
User manual
59