APV DELTA SW4, Operating Manual

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DELTA SW4 - UK-3.qxp 23.04.2009
UK
Single Seat and Change-over Valve
DELTA SW4
Operating manual UK - rev. 3 22
14. Trouble Shooting
15. Spare Parts Lists
The reference numbers of the spare parts for the different
valve designs and sizes are included in the attached
spare parts drawings with corresponding lists.
Please indicate the following data
to place an order for spare parts:
- number of required parts
- reference number
- designation.
To order a complete new SW4 valve, please use the
the corresponding ordering sheet.
DELTA SW4 - VALVE PROGRAMME
ORDERING SHEET FOR SW4 VALVES WITH FITTINGS
F a i l u r e R e m e d y
Valve closed and pressure in upper housing
Valve is untight.
Replace seat seals.
Check line pressure:
permissible line pressure see 7.
Leakage in the area of the clamp. Replace housing seals.
Leakage at the upper valve shaft in the area
of the valve yoke. Replace shaft seal, seat seal
and guide bush.
Actuator
Air escapes from the actuator rod. Replace complete seal screw for actuator.
Actuator does not work (air escapes permanently
from the venting plug.)
Replace complete actuator.
Valve position indication
Feedback is missing. Carry out fine adjustment.
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