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 designed to ensure a large initial air/gas pocket, maintaining the maximum distance between the liquid and the Sealing Mechanism; while allowing minimum body height.
• 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 composite materials.
• 1 1/2" threaded discharge 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.
• The main part of the air valve's body is made of Stainless Steel SAE 316 or Steel DIN St.37
• The cover and top of the air valve are made of Reinforced Nylon or Stainless Steel SAE 316.
• With a Vacuum Guarding, Out-only attachment, which only allows air discharge, not allowing air intake.
• With a Vacuum Breaking, In-only attachment, which only allows air intake, not allowing air discharge.
• With a Non-Slam, discharge-throttling attachment, which allows free air intake, but throttles air discharge.

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

More information:

Data sheet

View animation