Triple function air release valve

Composite high speed air release valve is composed of two parts: The high pressure diaphragm automatic air release valve andthe low pressure intake air release valve. The high pressure air valve automatically releases a small amount of air accumulatedinside the pipe under pressure. Low pressure air valve can discharge the air in the pipe when the empty pipe is iled with water,and automatically open and air inlet into pipe to eliminate vacuum when the pipe is drained or vacuum or under the condition ofwater column separation.