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SPRING LOADED BACK PRESSURE VALVE
11. 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.
12. Place the O-rings into the grooves in the outside of the cylinder.
13. Insert the spring into the piston, spring should extend above cylinder head.
14. Install O-ring and Backup ring onto spring plunger.
15. Insert spring plunger into spring cover.
16. Place spring guide on top of springs and install spring cover on top of spring and
spring guide.
17. Use an arbor press on top of the spring cover to press the springs.
18. Align the holes in the cylinder head with the mating holes in the spring cover and
insert the screws into the holes in the cylinder head. Tighten the screws using an
Allen wrench.
19. Remove the cylinder assembly from the arbor press.
20. Reconnect tubing to center of the cylinder head.
21. Install adjustment screw and locking cap.
8.5
Planned maintenance tasks
Table 8-3: Planned maintenance tasks
Task
Recommended action
Inspect
Implement a periodic inspection program to ensure all parts
are free from damage during its use due to process, ambient
or other abnormal conditions.
•
Internal components: cylinder, piston, spring, cylinder
head, seat retainer
•
Control valve body
•
Bolting
Clean
Use a non-toxic metal cleaning solvent.
Do not use common petrochemical solvents like Benzene,
Toluene or Xylene as they can pose potential health hazards.
Monitor corrosion / erosion / wear
A careful review of the control valve proving history, such as
control valve factor control charts, can reveal potential
problems bearing drag due to wear or increased internal
cross-sectional area due to erosion.
Part (seal) replacement
Visual inspection of the O-rings is recommended once a year
and replacement of the O-rings is recommended at least
once every five years. Follow internal procedures for part
replacement. Do not twist or overstretch the O-ring during
assembly.
User manual
Planned maintenance
DAN-20064957
August 2019
User manual
53
