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11. Replace the diaphragm. Continue to test the gap between the lever and the diaphragm after
each bending until the lever is in the correct position.
12. Return to
Section 5.3.4 of this manual to complete assembly of the regulator.
5.5 TESTING OF SECOND STAGE
A. Inhalation Effort
Check the inhalation effort of the second stage with a pan of water about five inches deep.
1. Slowly immerse the second stage with the front cover down and level. The regulator should
flow as soon as the diaphragm is a little deeper than level with surface of the water.
2. If you use a water column or water manometer to check inhalation effort, it should not exceed
1" w.c. (2.5 cm) at cracking. It should drop to about 3/4" w.c. (1.9 cm) at one atmosphere and a
moderate flow rate. You can alter the inhalation effort within a certain range.
3. You can increase the inhalation effort by turning the adjusting orifice clockwise. However,
discontinue clockwise adjusting when the lever becomes loose against the lever support .
4. You can decrease the inhalation effort by turning the adjusting orifice counter-clockwise.
Discontinue counter-clockwise adjusting when air begins to hiss past the second stage orifice.
5. Install the second stage on the end of the hose. Use two wrenches to tighten the hose fitting
with 40 in. lbs. (4.5 joules) of torque.
B. Exhalation Effort
1. If you do not use instruments to check the exhalation effort, the flow should feel smooth and
unrestricted.
2. If you use a water column, it should not exceed 1/2" w.c. (.02 bar) at one atmosphere.
3. Brand new exhaust valves will sometimes adhere slightly to the case, causing a slight increase
in inhalation effort. This condition will disappear with use.
C. Leak Test
1. Disconnect the air supply. Purge the regulator of all positive air pressure.
2. Slowly immerse the second stage in a pan of water with the mouthpiece pointing straight up.
3. Immerse the regulator until the water is 1/4" to 1/8" (.64 to .32 cm) from the lip of the
mouthpiece.
4. Hold the regulator in this position for one minute and then slowly raise it out of the water.
5. Tip the regulator mouthpiece downward and watch the inside of the mouthpiece tube. If any
water escapes from the mouthpiece tube, check for source of leakage.
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