DANIEL V707 User Manual page 41

Planned maintenance
August 2019
Table 8-2: Valve cylinder head to cylinder (socket head screws) torque specifications
NPS
2
2
2
3
3
3
4
4
4
8.4.2 Standard cylinder reassembly
Reassembly of a 707 control valve
Procedure
1. Place the cylinder in an upright position with the ports on the bottom. Lubricate the
inside of the cylinder wall with a suitable lubricant.
2. Insert the O-ring into the groove inside the bottom of the cylinder. This will require
some effort.
3. Insert the seat ring into the cylinder; placing it on top of the O-ring.
4. Using the piston as your tool, place it nose end down into the cylinder on top of the
seat ring. Using a hammer handle or similar device, press down on the piston to
force the seat ring into position against the lip in the cylinder.
5. Remove the piston from the cylinder.
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. Insert the piston into the cylinder, nose end down.
8. Turn the jack-out screws in the cylinder head to their original position.
9. Place the O-ring into the groove in the cylinder head.
10. Place the cylinder head on top of the spring.
SPRING PRESSURE HAZARD
Follow the instructions in
Failure to comply may cause force to release the spring, resulting in serious injury
or equipment damage.
52
Class
150
300
600
150
300
600
150
300
600
CAUTION
Step 10.
Socket head screw Torque (ft-lb)
size
1/4"-20 5
1/4"-20 5
1/4"-20 5
1/4"-20 5
1/4"-20 5
1/4"-20 5
1/4"-20 5
1/4"-20 5
1/4"-20 5
707 Spring Loaded Back Pressure Valve
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USER MANUAL
User manual
DAN-20064957
41