50 © Copyright 1970-2008 Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 080626002

Kirby Morgan 77

There are several possible ways to configure your emergency gas system, although at KMDSI we only recom-

mend one method. The configuration we recommend is as follows:

Cylinder Valve Open - EGS Valve on Helmet Closed

This is the only method that we recommend. The advantages of this method are as follows:

 •Youonlyneedtoopenonevalvetoactivateyouremergencysupply.

 •Thereislittledangerofoodingyourrststageregulatorandruiningit.

Possible Emergency Gas Supply Cylinder & EGS Valve Configurations
Configuration Cylinder Valve EGS Valve Advantages/Disadvantages
Configuration 1 On Off Advantages
(Regulator pressurized) • One valve to open
• First stage won’t flood
Disadvantages
• If hose or first stage leaks some
or all EGS gas will be lost
Configuration 2* Off On Advantages
(No pressure in • One valve to open
regulator) • No loss of gas from cylinder
if hose leaks or regulator leaks
Disadvantages
• First stage will flood and must
be serviced after each day of
diving
Configuration 3* On momentarily Off Advantages
(Regulator pressurized then Off • No loss of cylinder gas if
then cylinder valve hose or regulator leaks
closed) Disadvantages
• Two valves to open in
emergency
• Slow leak on long dive may
result in flooded 1st stage
• If dive depth exceeds pressure
in first stage, first stage will flood
Configuration 4* Off Off Advantages
• No use of cylinder gas unless
emergency occurs
Disadvantages
• Regulator will flood and need
service daily
• Two valves to open in
* Requires ability to reach cylinder emergency
valve without difficulty