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Well Service Air Valves are fully automatic float
operated valves designed to exhaust air which is
present in the pump column on pump startup and allow
air to re-enter the column on pump shutdown or if
a negative pressure occur. The Dual Port Throttling
Device (3 in. and smaller valves) provides adjustable
control of the exhaust rate and allows free flow
into the valve through a separate inlet port. The
Anti-Slam Device (4 in. and larger valves) throttles
the flow of water into the upper valve chamber after
the air has been exhausted to prevent rapid valve
closure. |