Trouble Shooting - SPX FLOW APV DELTA UF3 Instruction Manual

APV
APV_UF3 ATEX_UK-0_122018.indd
Failure
Valve closed
Leakage at discharge side
Leakage between housing and yoke flange
Leakage at valve shaft
Spring cylinder
Correction at spring cylinder is not possible.
Seat lift actuator
Seat lift actuator does not work
(air escapes permanently from the shaft rod).
Seat lift actuator does not work
(air escapes permanently from the vent bore).
Valve position indication
No feedback.
21
14. Trouble Shooting
Remedy
Replace seat seal (2, 2.1).
Check line pressure (max. 10 bar).
Check control of seat lift actuator.
Check housing seal (7) and shaft seal (4, 5), replace
damaged seals.
Replace shaft seal (4, 5).
Replace complete spring cylinder (21).
Replace o-ring (19).
Replace complete spring cylinder.
Do not open cylinder by force. Spring force!
Carry out fine adjustment.
UK
Relief Valve
DELTA UF3-ATEX
Instruction Manual UK-0