NOZZLE MIX SYSTEMS
5. Shut off gas supply, remove body plug and inlet test tap plug. While pressing gently downward on regulator valve, attempt to blow through a rubber tube attached to the inlet test tap. If back pressure does not build up, the balancing diaphragm is ruptured and must be replaced. (As an alternate test, try to wobble the regulator valve with a finger. If the balancing diaphragm is intact, it will hold the valve fairly rigid) REGULATOR NOT RESPONSIVE 1. Make sure thread protection cap is removed from vent. If impulse line is used, make sure it is not clogged, undersized, or inoperative due to bad installation. 2. Make sure of mixer suction by shutting of gas supply and reading water gauge attached to outlet test tap while air flows through the mixer. If impulse line is used, disconnect from regulator vent and attach it to water gauge to observe impulse magnitude and changes. 3. If suction or impulse is satisfactory but regulator still is not responsive, shut off gas supply, remove outlet test plug, connect rubber tube to regulator vent, and blow through tube. If pressure does not build up in the tube, the gas diaphragm is ruptured and must be replaced.
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