Air Valve
Air valves automatically vent trapped air and admit air under vacuum via a buoyant float in ductile iron (GGG50) or stainless bodies, DN25–DN300, threaded/flanged, PN10–PN25. Triple-function kinetic + automatic orifices give large exhaust on fill, micro-bubble release under pressure, vacuum breaking on pump trip—drip-tight EPDM seat, SS304/316 float, FBE-coated. For water, wastewater, irrigation, HVAC per EN 1074-4 / AWWA C512.
Air Valve Functions
Air valves protect pipelines by releasing trapped air and admitting air when internal pressure falls. A large kinetic orifice exhausts air while the main is filling. A small automatic orifice releases air that accumulates during pressurized operation. Vacuum admission helps prevent pipe collapse when pumps stop or the line drains.
Single, Double or Composite Type
A single-orifice valve performs one primary air-release function and suits smaller or simpler systems. A double-orifice valve combines large-volume exhaust with continuous automatic release. A composite or triple-function valve also provides vacuum protection, making it suitable where one connection must handle filling, normal operation and draining.
Air valves should be placed at pipeline high points, pump discharges and locations where the main can drain. Sizing depends on filling rate, pressure and air volume rather than pipe diameter alone. Ductile iron and stainless steel bodies are available with stainless steel floats and suitable elastomer seats.
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FAQ
1
Where should an air valve be installed?
At high points, pump discharge sections and other locations where air can collect or vacuum can form.
2
Should I choose single or double orifice?
Choose double or composite type when both large-volume exhaust and continuous air release are required.
3
Can the valve be serviced without draining the main?
Install an isolation valve below the air valve so it can be removed safely.
4
What information is needed for a quotation?
Please provide pipe size, working pressure, filling rate, medium, connection and required standard.
Veyron Valve (Tianjin) Co., Ltd. We offer a diverse product range, specializing in butterfly valves, gate valves, and check valves. Our butterfly valve comes in wafer, lug, and flanged types, plus we supply chain wheels, joints, stainers, and more.
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