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33AWS Well Service Combination Air Release & Vacuum ­Breaker Valve

Cla-Val Pacific 33AWS Well Service Air Valves regulate air discharge from the pump column to prevent shock and air entering the system with each start. Conversely with each pump stop, full flow unrestricted air is allowed back into the column to avert vacuum formation (which can damage pump seals) as well as to stop the pump from restarting against a full head in the column if a vacuum condition prevented the pump column from draining.