Double Orifice Air Release Valve

Air can collect inside water pipelines during normal operation, while much larger amounts of air need to be released or admitted when a pipeline is being filled, drained or emptied. A double-orifice air release valve is designed to handle both situations, using a small orifice for the release of accumulated air and a larger orifice for high-volume air discharge and admission.

This larger orifice provides the kinetic air function, helping manage rapid air movement and reduce the risk of vacuum formation in the pipeline. African Valve, as a supplier of double-orifice air release valves in Kenya, can provide these valves for water transmission systems, pumping stations, irrigation networks and other water infrastructure.

Technical Specifications

Materials & Components

• Body: Ductile Iron EN-GJS-500-7 / ASTM A536 Grade 65-45-12

• Bonnet: Ductile Iron EN-GJS-500-7 / ASTM A536 Grade 65-45-12

• Floats: Stainless Steel 304 / 316 / 316Ti

• Orifice Components: Stainless Steel 304 / 316

• Internal Guides: Stainless Steel 316 / Engineering Polymer

• Seat: EPDM / NBR

• Gaskets & Seals: EPDM / NBR

• Fasteners: Stainless Steel 304 / 316

• Coating: Fusion-Bonded Epoxy, where specified

Typical water-service constructions use ductile iron for the pressure-containing body and stainless steel for floats and internal components, with EPDM commonly used for sealing.