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APV_SWmini4_GB-2_042020.indd
Single Seat and Change-over Valve
DELTA SWmini4
Instruction manual: GB – rev. 2
GB
APV
17. Trouble Shooting
Trouble
Remedy
Leakage between yoke and housing
Replace upper housing seal (5).
Leakage between upper and lower housing
Replace lower housing seal (5).
Leakage out of the lower yoke bore
Replace guide bush (8), shaft seal (6) and seat seal (7).
Attention!
Check surface of valve shaft, replace valve
shaft if damaged (see instructions for
replacement of guide rod).
Actuator
Air escapes permanently at the upper und lower
piston rod
Replace quadring (6).
Air escapes permanently from the venting plug
Replace complete actuator (13).
Design with steam chamber
Steam comes out of the lower yoke bore
Replace guide bush (8) and O-ring (9.2).
Leakage in the steam line
Replace guide bush (8), shaft seal (6) seat seal (7) and
O-ring (9.2).
18. 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
subject to change
