MS Fabricated Valves – Air Cushion Valve
Air Cushion Valve (MS Fabricated)
Normally Spring loaded pressure relief valves are used to relieve High Surge pressures encountered during Water Hammer. But due to its design by which it opens slowly at a predetermined pressure and closes during negative pressure itis not effective in relieving the high surge pressures since Water Hammer surge consists of a series of fast alternating episodes of high pressure and low pressure
To counter Water Hammer surge, A valve that opens quickly and sucks in air into the pipeline but does not allow this air to escape on encountering a positive pressure wave. The slow closing ensures that the subsequent positive pressure waves are damped by the action of the entrapped air.
The recommended sizes of Air Cushion Valves for main pipeline diameter:
| Main Pipe Line Size | Air Cushion Valve Size |
|---|---|
| Upto DN300mm | 100mm |
| 350 & 400mm | 150mm |
| >450mm | 200mm |
