D-026 Combination Air Valve for Sewage “galil”
 The Combination Air Valve combines an Air & Vacuum large orifice and an Automatic small orifice in a single body. The valve is specially designed to operate with liquids carrying solid particles such as sewage and effluent. The combination air valve discharges air (gases) during the filling or charging of the system, admits air to the system while it is being emptied of liquid and discharges accumulated air (gases) from the system while it is under pressure and operating. The valve's unique design guarantees complete separation of the liquid from the sealing mechanism and provides optimum work conditions.
Applicatins
- Pump stations for sewage, waste water & water treatment plants.
- Sewage water, effluent water and sea water supply lines.
Operation
The Air & Vacuum component discharges air at high flow rates during the filling of the system and admits air into the system at high flow rates during its drainage. Water entry into the lower portion of the valve will cause the sealing of the valve. At any time during system operation, should internal pressure of the system fall below atmospheric pressure, air will re-enter the system. The smooth release of air prevalves pressure surges and other destructive phenomena. Admitting air in response to negative pressure protects the system from destructive vacuum conditions and prevalves damage caused by water column separation. Air re-entry is essential to efficiently drain the system. The automatic component releases entrapped air from peaks of pressurized systems in areas where the valve should be installed.
Pockets of accumulated air may cause the following destructive phenomena:
- Impediment of effective flow and hydraulic conductivity of the system along with a throttling effect as would a partially closed valve. In extreme cases this will cause complete flow stoppage.
- Accelerate cavitation damages.
- High-pressure surges.
- Accelerate corrosion of metal parts.
- Danger of a high-energy burst of compressed air.
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