Air Valve

Air valve

Air valve is a valve by which the entrance or escape of air can be regulatedAir valves are used to control the amount of air present inside pipes that are transporting fluids being moved via the pressure of a pump, such as water pipes in a municipal water supply. The three main types of air valves are air release valves, air/vacuum valves and combination air valves.

An air valve includes a tubular seat, a cap, and a plug. The tubular seat has an outer circumferential surface forming sealing slots, first external thread and second external thread and also forms an axially-extending air passage. The cap has an inside circumferential surface forming first internal thread, second internal thread, and a barrier web. The barrier web forms a bore and a plurality of air holes. The cap has a distal open end to which a lid is mounted. The plug has an expanded proximal end to which a sealing pad is attached and a reduced section slid ably received in the bore of the barrier web and having a distal end to which a stop is mounted so that the plug is axially movable with respect to the barrier web. The cap is screwed onto the tubular seat and is selectively set at different axial locations so that the sealing pad is selectively set in engagement with or disengagement from the air passage to selectively set the air valve in a primary closing condition, where sealing is ensured and leaking of air is prevented, an open condition, where air is allow to freely flow into and out of the air valve, and an air releasing condition, where air is only allowed to flow out of the air valve.