21
APV_RGMS4_ATEX_UK-1_122018.indd
UK
Modulating valve with supported producut diaphragm
APV DELTA RGMS4 - MFS + MFH ATEX
Instruction manual UK-1
APV
! If damaged seals are changed, generally all seals should be replaced.
! For the valve service complete seal kits are available (see spare parts lists).
13. Trouble Shooting
Failure
Remedy
Leakage between upper housing flange and
yoke flange.
Replace diaphragm (15) and o-rings (14, 18)
Leakage from the leakage drain in the yoke area. Replace diaphragm (15) and o-rings (14, 18).
Leakage between lower housing flange and
mating flange.
Replace housing seal (8) flange seal (3.1).
Leakage at the lateral flange connection..
Replace flange seal (3).
Air escapes at the diaphragm actuator.
Check threaded connections,
replace rolling diaphragm if necessary.
Air escapes at the air connections.
Check reducer and air connections.
Seal or replace parts if necessary.
Valve does not regulate properly.
Check air connection and air pressure.
Check electric connection and control signal.
Use operating manual of positioner to find failure.