Description
The Combination Air Valve combines an Air & vacuum large orifice and an Automatic small orifice in a single body. The valve is specially designed to operate with liquids carrying solid particles such as wastewater and effluent. The combination air valve discharges air (gases) during the filling or charging of the system, admits air to the system while draining and at water column separation and discharges accumulated air (gases) from the system while operating under pressure. The valve's unique design guarantees separation of the liquid from the sealing mechanism and provides optimum work conditions.

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.
• The valve's unique design prevents any contact between wastewater and the sealing mechanism by creating an air gap at the top of the valve. This air gap is guaranteed even under extreme conditions.
These features are achieved by:
• The conical body shape and the external lever designed to assure a large initial air/gas pocket, maintaining the maximum distance between the liquid and the Sealing Mechanism; while allowing minimum body height.
• The D-023's orifice plug-disc linkage assembly is external, keeping the levers and pins outside the air valve body and its corrosive atmosphere.
• A spring supported joint between the stem and the upper float assures that vibrations of the lower float will not unseal the air release orifice of the air valve. Release of air will occur only after enough air accumulates.
The Rolling Seal Mechanism in the valve design is less sensitive to pressure changes than a direct float seal. It allows a comparably large orifice for a wide pressure range (up to 250 psi).
• Funnel-shaped lower body is designed to ensure that residue wastewater matter will drain to the pipe, to be carried away by the flow, and will not remain in the valve.
• All internal metal parts are made of stainless steel. The floats are made of plastic materials.
• 1 1/2" threaded drainage outlet enables removal of excess fluids.
• The valve discharges air at high flow rate without premature closing.

Valve Selection
• These valves are manufactures with flanged ends to meet ASA 150 standard or any requested standard. The 2” valve is also available with NPT male threads.
• Available with a controlled air release valve mechanism (NS) as an hammer reducing valve and prevents slam D-023 NS.

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

More information:

Data sheet