Air release valve is used in wet pipe sprinkler systems and on casing of horizontal split case pump, so to automatically release small pockets of accumulated air while the system operates under pressure exceeding atmospheric pressure. Air Release Valves are designed to vent trapped air that collects at high points in a pipeline. These Valves continuously release air from piping systems thereby preventing large air pockets to form which can cause damaging pressure surge to the system. Air release valves permit trapped air to be released from piping systems without losing water pressure. The small orifice releases air under pressure during normal pipeline operation.