Kirby Morgan 37 & 57
7.7.11SuperFlow 350 Regulator Steady Flows When Pressured Up: Special Tools Used
Tools Required:
Small flat blade screw driver.
Small jewelers screw driver or metal scribe. Needle nose pliers.
KMDSI regulator tool kit if available.
A few words about the demand regulator: The de- mand regulator is rugged and reliable. However, to maintain optimum performance it should be checked prior to each diving day in accordance with the brief procedure Demand Regulator Test for Correct Adjustment, Fully Assembled.
If after completing the demand regulator test as outlined in this chapter, adjustment is necessary and the special KMDSI tool kit is not available proceed as follows:
1)Remove the regulator clamp, cover and dia- phragm.
2)Adjust the regulator adjustment knob all the way in. Finger tight only.
3)Pressurize the regulator to between
4)If the regulator is not free flowing, slowly back out on the adjustment knob until a slight free flow is heard and then rotate the adjustment knob in (clockwise) 1/4 turn and depress the purge button momentarily. Repeat this procedure until the gas flow stops.
Usually at this point the regulator adjustment knob will be between 5 and 7 turns out. Note: If when backing the adjustment knob out from the full “in” position, the regulator starts free flowing at less than five turns, then this usually indicates insuf- ficient free play at the lever.
There are several issues that could cause the regulator to free flow, even when the adjustment knob is turned all the way in. These are as follows:
A)The regulator was rebuilt and the adjustment nut is too tight. If this is the case, the nut must be loosened.
B)The washer was never removed from the regu- lator and a second one has accidentally been in- stalled. If this is the case, the second washer must be removed.
C)The regulator body has never been properly ser- viced and there is corrosion inside the body, making proper inlet valve travel impossible.
5)Check the free play at the lever. The lever should have between
6)KMDSI tools: Using the inlet valve holding rod, (L shaped rod), insert the end of the rod into the bal- ance hole. Lightly apply force by pushing on the rod making it act as a lever to put friction against the inlet valve shaft. At this point, the KMDSI wrench can be used to rotate the lever nut . Rotate the nut “In” (clockwise) to reduce lever play or “Out” (counter clockwise) to increase lever play.
Only rotate the nut 1/8 turn at a time. Remove the tools and depress the lever several times after adjust- ing to ensure the correct play is achieved. It may be necessary to repeat this procedure several times, as the method requires estimating the correct position of the nut. Note: if there is little (less than 1/16 inch /1.5
mm)or no lever play, the regulator will free flow. If there is too much free play, (more than 1/8 inch / 3.0
mm)the regulator will not be capable of full demand flow potential.
WARNING
The lock nut must always be replaced if removed from the inlet valve. The plastic material that locks the nut is not designed for multiple reuse. If the nut comes loose during a dive the regulator would free flow heavily. In the situation where the diver is using bottled breathing gas this would result in a rapid consumption of breathing gas.
CAUTION
The nut must not be loosened more than 1/8 turn to lower the height of the lever. If more adjustment is necessary the lever should be bent downward. If the nut is loosened more than 1/8 turn the lever will not have enough travel for proper flow rates.
7)If the free flow did not stop after this procedure, refer to regulator disassembly and cleaning proce- dures.
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