Spirax Sarco DP27 - 5.8 How to service or renew the main valve and seat

IM-P470-03 CH Issue 7
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5.8 How to service or renew the main valve and seat
DP27, DP27E and DP27Y
Isolate the reducing valve and zero the pressure.
DP27R
Isolate the actuating air supply and zero the pressure.
35. Unscrew the unions and release the pipework.
36. Unscrew the nuts.
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