Description
The D-040 Combination Air Valve has the features of both an Air-release valve and an Air/vacuum valve. The Air-release component of the D-040 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.

Main Features
• Working pressure range: 3-250 psi. Testing pressure: 360 psi.
• Maximum working temperature 203° f
• Light, simple and reliable structure.
• Prevents premature closing:
- The valve discharges air at high velocity.
- The orifice of the Automatic continuous acting valve is larger than in any other air release valve of it's kind, therefore it discharges air at higher flow rates.
• The size of the Automatic orifice makes its obstruction by debris most unlikely.
• The valve design - Rolling Seal Mechanism: is less sensitive to pressure differentials than a direct float seal. It accomplishes this by having a comparably large orifice for a wide pressure range (up to 250 psi).
• The body is made of high strength plastic, and all operating parts are made of specially selected corrosion resistant materials.
• Due to its light weight, the valve may be installed on plastic piping systems, as well as other lightweight piping.
• A threaded drainage outlet enables removal of excess fluids (1½ " in the 2", 3/8" in the 1")

Valve Selection
The D-040 air valve is available:
• With 1 ",2" male NPT connections.
• With a Vacuum Guarding, Out-only attachment, which only allows air discharge, not allowing air intake.

Ordering:
Upon ordering, please specify: model, size, working pressure, threads/flanges standard and type of liquid.

More information:

Data sheet 1 (396 KB)

Data sheet 2 (421 KB)

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