Description
The D-040 Combination Air Valve has the features of both an Airrelease valve and an Air/vacuum valve.
The Air-release component of the D-040 is designed to automatically release to the atmosphere small pockets of air as they accumulate along a pipeline when the pipeline or piping system is full and operating under pressure.
The Air/vacuum component is 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.
• Working Temperature: 140° f.
• Maximum working temperature for short time period: 194° f.
• Light, simple and reliable structure.
• The valve discharges air at high velocity, without premature closing.
• The automatic air release orifice is very large relative to the size of the air valve body, therefore it discharges air at high flow rates.
• The size of the automatic orifice lessens the danger of its obstruction by debris.
• The rolling seal mechanism of the valve is less sensitive to pressure differential than a direct float seal. It is due to its comparably large orifice and its wide pressure range 3- 250 psi.
• The body is made of high strength composite materials 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.

Valve Selection
The D-040 air valve is available:
• With 3/4", 1" male NPT connections.
• With 2" female NPT connections.
• D-040 body made of composite materials.
• D-040-C with anti-vandalism cover.
• D-040 STST body made of Stainless Steel.
• D-040 ST with Stainless Steel base.

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

More information:

Data sheet

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