Service & Repair Manual
▼A properly serviced and adjusted regulator should deliver air upon deep inhalation without excessive inhalation effort, freeflow, or vibration. When exhaling, there should be no resistance or sticking of the exhalation valve. If any of these problems occur, refer to Table 2 - Troubleshooting.
Flowbench Testing (optional)
The Subjective Breathing Test, combined with the Intermedi- ate Pressure Test, will sufficiently verify the regulator's perfor- mance in most circumstances. As an additional test, a Magnahelic flowbench can be used to verify the opening effort, which should not exceed 1.5 – 2.0 column inches H2O.
External Leak Test
After first stage reassembly and final adjustment of the second stage has been completed, submerge the entire regula- tor in a test tank of clean water while pressurized with 2,500- 3000 psi. Observe any bubbles arising from the submerged regulator over a one minute period. The recommended time is necessary due to slower bubble formation that occurs in smaller leaks. Disassemble the regulator at the source of the leak to check sealing surfaces, assembly sequence and component positioning in order to correct the problem(s).
NOTE: The location of extremely small leaks can best be detected by applying a soap solution to the leak area. Be- fore disassembling to correct any leaks, rinse the entire regu- lator thoroughly with fresh water and blow out all residual moisture with filtered,
▼When the second stage has been adjusted and tested according to the prescribed procedures, close the cylinder valve completely, and purge the second stage to depressur- ize the system. Loosen the yoke screw to remove the first stage from the cylinder, and seal the dust cap over the inlet fitting. Disinfect the mouthpiece, and dry the regulator completely with a clean towel.
This completes the overhaul service procedures for the
Atlas/Yukon Second Stage Regulator
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