Check Valves

Inspect check valve "A" by blowing air from each side of valve. See Fig 2. Ensure air does not flow from manifold side of valve to Air Switching Valve (ASV) side.
Air should flow from Air Switching Valve (ASV) to manifold. If check valve does not function as described, replace valve.
Inspect check valve "B". Ensure air does not flow from Black to Orange side of nozzle. Air should flow from Orange to Black side. If check valve does not function as described, replace valve.

Fig 1: Testing Vacuum Switching Valve

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Fig 2: Air Injection System Components & Operating Parameters ID

Fig 3: Air Injection System Components & Operating Parameters ID