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DAV-MH

Air Release and Vacuum Break Valves
 
Operation:
Venting air from a filling pipeline
The standard valve allows discharge of trapped air while the system is being filled with liquid. The valve will remain open, even at very high air flow velocity (A), until the liquid has reached the float and lifted it to its closed position (B). Available for valve models with suffix "K" and "KA".

Operation:
Vacuum Breaking (Air Intake)of a draining pipeline
Decrease or the pressure in the system to negative value and the simultaneous drainage of the valve chamber, forces the floats down, allowing the admittance of air into the pipe, thus preventing cavitation conditionsand possible collapse of the pipe (C). Available for valve models with suffix "K" and "KA".

Operation:
Release of dissolved air from a pressurized pipeline
Air that is being released from the liquid in the pressurized system or being introduced into the system from open sources and pumping vortexes, accumulates in the air release valves located at high places. The accumulated air forces the liquid out of the valve chamber, so the floating force of the bottom float decreases. The bottom float then drops, allowing for the trapped air to bevented through the small nozzle at the center of the top float. Then the liquid level rises, the bottom floatis lifted and the nozzle closes (D). Available for valve models with suffix "KA" only.
 







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