D-050 Combination Air Valve 
 Description
The D-050 Combination Air Valve has the features of both an Air-release valve and an Air/vacuum valve. The Air-release component of the D-050 was designed to automatically release to the atmosphere small pockets of air as they accumulate at local high points along a pipeline when the pipeline or piping system is full and operating under pressure. The Air/vacuum component was designed to automatically discharge or admit large volumes of air during the filling or draining of a pipeline or piping system. This valve will open to relieve negative pressures whenever water column separation occurs.
Operation
The Air & Vacuum component, with the large orifice, exhausts air at high flow rates during the filling of the system and admits air at high flow rates during its drainage. High velocity air, or even air mixed with a mist of water spray, cannot blow the float shut. Water entry will cause the sealing of the valve. At any time during system operation, should internal pressure of the system fall below atmospheric pressure, air will re-enter the system. The smooth release of air prevents pressure surges and other destructive phenomena. Admitting air in response to negative pressure protects the system from destructive vacuum conditions and prevents damage caused by water column separation. Air re-entry is essential to efficiently drain the system. The automatic Air Release component, releases entrapped air from peaks of pressurized systems where the valve should be installed.
Pockets of accumulated air may cause the following destructive phenomena:
- Impediment of effective flow and hydraulic conductivity of the system, along with a throttling effect as would a partially closed valve. In extreme cases this will cause complete flow stoppage.
- Accelerate cavitation damages.
- High pressure surges.
Main Features
- Reliable operation reduces water hammer incidents. Dynamic design allows high velocity air discharge; Preventing premature closing.
- Lightweight, small dimensions, simple and reliable structure.
- Special orifice seat design: combination of bronze and E.P.D.M rubber, assures long-term maintenance free operation.
- The drainage outlet enables removal of excess fluids.
- Working pressure range: 0.2-16 bar
Automatic component
- Large orifice:
Dramatically reduces the possibility of obstruction by debris. Discharges high air flow rates, as much as 14 times more than any other existing Automatic Air Release valve. One size orifice for a wide pressure range (up to 16 bar). Achieved by: A.R.I patent, Rolling Seal Mechanism.
- Body made of high strength materials.
- All operating parts are made of specially selected corrosion resistant polymer materials.
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