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APV_SW4_UK-4_082017.indd
UK
Single seat and change-over valve
DELTA SW4
Instruction manual: UK - rev.4
APV
16. Trouble Shooting
Failure Remedy
Valve closed and pressure in upper housing
Valve is untight.
Replace seat seals.
Check line pressure:
Permissible line pressure see chapter 9.
Leakage in the area of the clamp Replace housing seals.
Leakage at upper shaft in the yoke area Replace shaft seal, seat seal and guide bushing.
Actuator
Air escapes at the actuator rod. Replace complete seal screw for actuator.
Actuator does not work (air escapces permanently from
the venting plug).
Replace complete actuator.
Valve position indication
No feedback. Carry out fine adjustment.
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