SPX APV DELTA SDU4, Operating Manual, Page: 22 / 39

17
12. Trouble Shooting
The item numbers refer to the respective spare parts drawings
- Valve is untight,
leakages via the
leakage valves
: Replace seat seals (15 / 15.1, 16).
Check line pressure:
perm. line pressure see 8.
- Leakages at the cylinder
of the leakage valve
: Replace O-rings (5, 7, 8).
Check cleaning liquid supply.
- Leakage between the
middle and lower housing :
Replace housing seal (4).
- Leakages between
housing and yoke flange :
Replace housing seal (8).
- Shaft passage in the
yoke is untight
: Replace seals (9, 10, 11).
- Air escapes from the
actuator
: Dismantle actuator (23) from
(see spare parts list valve, replace seal (2) and
RN 01.054.86) O-ring (3) in the seal screw (1).
- Actuator does not work,
air escapes permanently
via the venting plug
: Replace actuator.
- Valve position indication
is missing or unprecise
: Carry out fine adjustment
according to service
instructions of control unit.
13. Spare Parts Lists
(see annex)
Double Seal Change-Over Valves
Delta SDU 4
Operating Manual Rev. 1
UK