Europe,
Middle
East,
and
Africa
Only
Type FL
21
Table 12.
General Troubleshooting for FL Series Regulator
Table 13.
Troubleshooting for Type PS/79-1, PS/79-2, RE/79-1 and RE/79-2 Pilots
TROuBLEShOOTING
SymPTOmS
CauSE
aCTIONS
The regulator does not open
Lack of incoming gas
Check the station feeding
Pilot is not being supplied
Check pilot connections
Regulator diaphragm is broken
To be replaced
The slam-shut device has not been reset
Manually reset the slam-shut device
Drop in pressure downstream from the
regulator
Insufficient upstream pressure
Check the station feeding
Flow requirements higher than the flow
that the regulator can supply
Check the regulator sizing
Faulty supply to or leakage from the pilot
Check pilot connections and internal parts
Filter upstream is obstructed
Clean or replace it
Increase in pressure downstream from the
regulator
Tight shutoff gaskets are worn
To be replaced
Deposits of grime on the tight shutoff pad are
obstructing proper positioning of the shutter
Clean or replace it
Regulator hunting
Control intakes in incorrect positions
Check connections position
Very low flow demand
Check the pilots setting and tuning
Pilot supply and discharge valves are not
adjusted perfectly
Check supply and discharge valves
opening position
Freezing occurs
Heating insufficient or lacking
Increase gas heating temperature or dry the gas
Slam-shut device does not execute tight
shutoff procedure (only for BFL version)
O-ring and/or slam-shut pad worn
To be replaced
Slam-shut seat damaged
To be replaced
SymPTOmS
CauSE
aCTIONS
Desired setpoint is not reached
Calibration spring (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 flow feeding
Outlet pressure drops well below setpoint
Filter (key 41) is clogged preventing proper
through-flow of gas
Clean or to be replaced
Pad holder (key 45) is swollen preventing
proper feed flow
To be replaced
Pad holder (key 29) is swollen preventing
proper feed flow
To be replaced
Outlet pressure increases over setpoint
Faulty sealing of pad holder (key 45)
To be replaced
Faulty sealing of pad holder (key 29)
To be replaced
Slow response to changes in gas demand
Insufficient flow rate of valve seat (key 25)
Increase flow by means of register/pin screw (key 24)
Over large calibration jet (key 18)
(only for types PS/79-1 and PS/79-2)
To be replaced with a smaller one
Overly rapid response to changes in gas
demand, i.e. Hunting
Excessive flow rate of valve seat (25)
Reduce flow by means of a pin screw (key 24)
Calibration jet (18) is too small
(only for types PS/79-1 and PS/79-2)
To be replaced with a larger one
Not proper internal parts assembly
Check clearance between lever (key 36) and valve seat (key 25)
Gas continually escaping from relief (S)
Defective seal of pad (key 59)
(only for types RE/79-1 and RE/79-2)
To be replaced