Europe, Middle East, and Africa Only
Table 15. Troubleshooting for OS/80X Series Actuator
Table 14. Troubleshooting for Type PS/79, RE/79, PS/80, and RE/80 Pilots
SYMPTOMS CAUSE ACTIONS
Actuator does not remain set
The actuator impulse intake (A) is not
connected properly
Check connections (A)
Downstream pressure coincides with the
maximum or minimum slam-shut settings
Check slam-shut settings
Diaphragm (key 62) is damaged
(Gaco ex (key 66) on types OS/84X, OS/88X)
To be replaced
SYMPTOMS CAUSE ACTIONS
Desired setpoint is not reached
Calibration spring (key 5) is too weak
Check the springs catalogue and replace it with a
stronger one
Leaks from pilot connections
Check pilot feed connections and proper gas ow
feeding
Outlet pressure drops well below setpoint
Filter (key 61) is clogged preventing proper
through-ow of gas
Clean or replace it
Pad holder (key 56) is swollen preventing
proper feed ow
To be replaced
Pad holder (key 34) is swollen preventing
proper feed ow
To be replaced
Outlet pressure increases over setpoint
Faulty sealing of pad holder (key 56) To be replaced
Faulty sealing of pad holder (key 34) To be replaced
Slow response to changes in gas demand
Insufcient ow rate of valve seat (key 30) Increase ow by means of register/pin screw (key 29)
Over-large calibration jet (key 15)
(only for types PS/79 and PS/80)
To be replaced with a smaller one
Over rapid response to changes in gas
demand, i.e. Hunting
Excessive ow rate of valve seat (key 30) Reduce ow by means of a pin screw (key 29)
Calibration jet (key 15) is too small
(only for types PS/79 and PS/80)
To be replaced with a larger one
Not proper internal parts assembly
Check clearance between lever (key 39)
and forked stem (key 35)
Gas continually escaping from relief (S) Defective seal of pad (key 21) To be replaced
The outlet pressure is not within the
usual values
Diaphragm (key 10) are damaged Replace diaphragm
Upper diaphragm (key 10) is damaged
(only for types PS/80 and RE/80)
Replace diaphragm
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