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Some of the more common symptoms of a possibly faulty regulator are listed below:
1. Gas leaking at the regulator outlet when the adjusting screw is completely released
2. With no flow through the system (downstream valves closed and adjusting screw in),
working pressure increasing steadily above set pressure.
3. Gas leakage from spring case (adjusting screw end of regulator)
4. Gas leakage from any point
5. Excessive drop in working pressure with regulator flow open
6. Gas leakage from relief valve
D.
Regulator Repair
If it is determined a regulator is faulty, it must be dissembled, cleaned, and repaired as
determined from the above symptoms.
Disassembly and reassembly is as shown in Fig. 7.
Using a wrench on the hex of the spring cap, unscrew the spring case. All parts down to
and including the diaphragm will remain in the spring case.
Remove the thrust plate, then unscrew the retainer and remove the seat with the pin.
Inspect the regulator as follows:
1. Thorough cleaning of all parts is essential. Make sure that small orifices are open.
2. Make sure all diaphragm, gaskets, "O" rings and other non-metal parts are not brittle,
cracked or misshaped.
3. Do not use any oil on the internal parts of the regulator.
4. Use pipe thread compound (pipe dope) on all pipe threaded fittings as they are
assembled.
Replace the seat and pin by installing the retrofit kit, then reassemble the regulator.
Always pressure test a regulator that has just been repaired. Use the list of symptoms
above as a check list.