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
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