Kirby Morgan 37 & 57
WARNING
The control knob for the emergency valve and the defogger knob are not in- terchangeable. Use only the correct knob for the appropriate valve.
and rotate the stem all the way out, then back again. The rotation must be smooth. If “hard spots” or un- evenness are felt during the rotation, the stem may be bent and could need replacement.
8)Tighten the packing nut with a torque wrench until moderate resistance is felt when turning the knob. Torque to 50 inch pounds after seating.
9)Place the spring, and locknut onto the stem secur- ing the knob.
10)Tighten the locknut until its top is flush with the top of the knob. The assembly is now complete and ready for testing.
NOTE: If the valve was removed from the side block testing of the emergency gas valve is easily accom- plished by attaching the valve, by itself in the shut position, on to the
11)Before wrapping the threads with pipe tape, check the fit of the valve assembly pipe threads to the mating threads of the side block. There should be 2 turns of hand make up before needing to use a wrench.
WARNING
Use only thin Teflon tape when installing the Emergency Gas Supply valve in the side block. Thick tape can lead to thread damage, which may make it impossible to install the EGS valve in the side block properly. This could lead to a loss of breathing gas.
If there is less make up, then the threads will need to be chased with a 1/4” NPT tap to obtain the proper make up. If thread chasing is required, the bent tube assembly, the one way valve assembly and steady flow components must all be removed and the side block body must be thoroughly cleaned to remove any loose particles.
12)Before installing the valve assembly, wrap the pipe threads with
the first thread. Apply the tape with slight tension to allow the tape to fill into the threads.
Hand tighten the valve, then continue an additional
DO NOT TIGHTEN THE VALVE BODY TIGHTER THAN NECESSARY! OVER TIGHTENING MAY OVERSTRESS THE PART AND CAUSE THE PART TO FAIL.
It is NOT necessary to have the control knob for the emergency gas supply valve perfectly “square,” i.e., at a 90 degree angle to the side block. Any angle is ac- ceptable provided that 1) the valve handle can be turned easily and 2) the diver can locate the handle easily.
7.5.4 Leak Testing the EGS Valve
a)Attach supply whip from the EGS first stage to EGS helmet valve.
b)Ensure the defogger valve knob is open and the EGS Valve is shut.
c)Pressurize EGS Valve to a minimum of 135 p.s.i.g. (9.3 bar) using the EGS cylinder as supply. Allow sys- tem pressure to stabilize, and then shut the EGS supply cylinder valve. Note time and final stabilized system pressure.
d)Perform the leak check for minimum of five min- utes, using the mild soapy solution, per Chapter 6. Ensure there is no gas flowing or pressure drop in the system. There should be no visible signs of external leakage if the valve is operating properly.
WARNING
A leaking Emergency Gas Valve assembly can cause the diver to exhaust his entire EGS (bailout) without his knowledge. This may lead the diver to mistakenly assume his EGS supply is available when it is not. This could lead to panic or drowning in an emergency. Any worn or damaged components must be replaced.
A submersible pressure gauge should always be used with the EGS sys- tem to help minimize this risk.
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