Ductile iron Double Orifice air valve


  • Compound Air Release Valve

  • Size: DN50-DN300

  • Pressure: PN10, PN16, Class125/150

  • Standard:  EN593, DIN 2501 PN6/10/16, DIN3202


  • Body : Ductile Iron/Carbon Steel

  • Ball : Stainless Steel 304


  • Medium: Water, Oil, Gas

  • Temperature: 0-80℃

Compound Air Release Valve

Detail / Feature / Application

Detail / Feature / Application

  • The valve body of the CARX compound air release valve is barrel-shaped, and the internal parts include floats, bushings, discs, plugs, valve stems, etc. 

  • This valve is installed at the outlet of the pump or in the water delivery and distribution pipeline to remove the air accumulated in the pipe to improve the efficiency of the pipeline-level water pump. 

  • When negative pressure is generated in the pipe, this valve quickly sucks in outside air to prevent damage to the pipeline due to negative pressure.

  • The compound air release valve is installed at the highest point of the pipeline or in the place where there is a closed gas, to remove the gas in the pipeline to clear the pipeline and achieve normal operation. 

  • If the exhaust valve is not installed, the liquid flowing in the pipe will generate dynamic heat and cause gas, which will form a short circuit, which will make the water outlet capacity of the pipe not meet the requirements; 

  • Secondly, when the pipeline is running, there will be a negative pressure in the pipeline, which will cause the pipeline to vibrate or rupture.

  • The exhaust (suction) valve quickly sucks air into the pipe to prevent the pipe from vibrating or breaking.

Working principle

the open position to perform a large amount of exhaust; when the air is exhausted, the water floating ball in the valve floats, and the plug is driven to the closed position to stop the large amount of exhaust. When the water in the pipe is normally transported, if a small amount of gas accumulates in the valve to a considerable extent, the water level in the valve drops, and the float ball drops accordingly, and the gas is discharged from the small hole. When the water pump stops and the water in the pipe is empty, or when a negative pressure is generated in the pipe, the plug is opened at this time to suck in air to ensure the safety of the pipeline.

The CARX compound air release valve is the second-generation compound air release valve, which greatly exceeds the first-generation in terms of performance and appearance. Its structure is integral, integrating large-hole exhaust and small-hole micro-exhaust.

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