Emerson Daniel 700 Series User Manual page 59

User manual
P/N 3-9008-553
6. With the piston in a vertical position, nose end down, place the O-ring into the
7. Place the indicator stem retaining ring into the counter bore of the piston. Place the
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
13. Align the holes in the cylinder head with the mating holes in the cylinder and insert
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
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
2. Place the magnets onto the indicator stem, and retain the magnets by placing the
3. Coat the threads of the indicator adapter with pipe sealant, and place the indicator
4. Place the ring magnet on the indicator adapter.
5. Place the indicator housing over the indicator adapter, and secure it with the
User manual
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.)
washer on top of the indicator stem retaining ring. Using retaining ring pliers, place
the retaining ring on top of the washer.
of the cylinder head to press the spring into the cylinder.
CAUTION
SPRING PRESSURE HAZARD
Follow the instructions in
Failure to comply may cause force to release the spring, resulting in serious injury
or equipment damage.
the screws into the holes in the cylinder head. Tighten the screws using an Allen
wrench.
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.
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.
retaining ring on the indicator stem.
adapter over the indicator stem, and screw it into the cylinder head. The connection
for the tubing should face upwards.
indicator top and screw.
Step 12.
Planned maintenance
November 2020
59