Demand Regulator Malfunction - Kirby Morgan 77 Operation And Maintenance Manual

4.6 Demand Regulator Malfunction

Symptoms
Regulator continuously free flows. Adjustment knob not screwed in.
Regulator continuously free flows
when underwater only.
Regulator is hard breathing.
Regulator does not supply gas.
4.7 Emergency Gas Supply Valve
Symptoms
Bail-out bottle drained without diver
opening EGS valve
Knob difficult to turn.
Valve will not flow gas.
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
Probable Cause
Bent tube damaged causing mis-
alignment of adjustment nipple.
Supply pressure too high.
Regulator out of adjustment.
Neck dam turned down, or too large
for divers neck.
Hair caught between o-ring and
base of helmet.
Neck dam torn.
Poor seal in neck dam ring As-
sembly
Adjustment knob screwed too far in. Screw adjustment knob out.
Supply pressure too low.
Regulator improperly set up.
Gas supply pressure too low.
Regulator is out of adjustment.
No gas in umbilical
Blockage in breathing system.
Probable Cause
Stem fails to seat in valve body.
Debris under sea causing leakage.
Leaking over-pressure relief valve
on bail-out regulator.
Leaking bail-out regulator on bottle. Service regulator.
Leak in supply line 1st stage
Stem bent.
Foreign matter in valve.
Stripped control knob.
Kirby Morgan
Remedy
Screw in adjustment knob.
Check the inlet nipple and soft seat.
Replace as necessary.
Adjust supply pressure lower than
225 p.s.i. over ambient.
Adjust regulator
Neck dam must be turned up. Re-
place neck dam with proper size.
Clean hair out.
Repair or replace neck dam.
Replace O-rings
Increase supply pressure.
Increase supply pressure to mini-
mum required for depth.
Adjust regulator
Turn diver's gas supply on topside.
Disassemble regulator, clean, and
adjust.
Remedy
Replace EGS valve body.
Service valve.
Service valve.
Service regulator.
Replace stem.
Disassemble, clean, and
reassemble.
Replace knob.
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