Double Orifice Air Release Valve Descriptions
Double orifice air release valve is one normal type of exhaust valve in the long big piping transport, which is normally mounted on the top of the pipe or pipe air holding place to discharge the air in the pipe, When the power supply for the pump is off, pump is stopped working, there will be negative pressure inside of pipeline, there will be vibration or break happened. Then, the air valve will work to suck into air quickly, keep the pressure inside the pipeline to be safe, making sure the pipe work normally. Flowspec combined air vent valve can remove the air existed in the pipe more flexible, proventing of the pressure fluctuation or other damages in the piping system. Double orifice air release valve is applicable especially to the main water pipes and deep well pumps piping system.
- Discharge air more flexible
- Preventing of the water hammer
- Discharge the air slowly
- Safer self-protection
- Long service life
- Design & manufacturing: BS EN1074-4:2000
- Face to face: BS EN1074-4
- Flanged ends: EN 1092-2:1997, ASME B16.1/B16.42, AS4087
- Inspection & testing: EN 12266-1:2012
- Quality assurance: ISO 90001
- Special: WRAS approved
- Applicable medium: water, sewage, sea water
- Applicable temperature: 0 ℃ ~ + 80 ℃ (higher temperature is available upon request)
- Nominal pressure: PN1.0 / PN1.6MPa
- Size: 2”~ 8” (DN50 ~ 200mm)
- Materials: cast iron A126 B (GG25), ductile iron A536 65-45-12 (GGG40)
- Water projects
- High buildings
- Water treatment industry
- Power plant
- Pump station
Why Choose Flowspec Luokai
45+ Years Experience
Founded in 1978, manufacturing industrial valves for over four decades with proven reliability worldwide.
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ISO 9001, CE/PED, WRAS, FM, UL, API approved — compliant with international quality and safety standards.
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Flexible design and manufacturing per your specifications — material, size, pressure, actuation tailored to project needs.
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Exported to 5 continents — North & South America, Europe, Middle East, Southeast Asia, and Africa.
Our Service Promise
Strict Quality Control
Every valve tested to API 598, EN 12266 before shipment
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Reliable logistics to 5 continents with secure packaging
OEM & Custom Design
Tailored material, size, pressure and actuation to your specs
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Technical support and service throughout product lifecycle


