KINGNA TRADING

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Double Orifice Air Valve (QB2)

Industrial valves and fittings dispatch fast — wear parts and complete machines quoted on request.

Air Release Valves

Air valves that vent and admit air to keep pipelines flowing and prevent vacuum collapse.

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The double-orifice valve carries two paths in one body: a large orifice that vents the bulk air of a filling main and admits air fast enough to prevent a vacuum when a pump trips, and a small orifice that keeps bleeding the air that accumulates in service. That split is why it is the default at pump stations and on transmission mains — the large orifice is what stops the surge, the small one is what stops the air pocket. It must be mounted at the true high point, vertical, with the float chamber able to drain: on a horizontal run the float hangs and the valve passes water.

General Specifications

Size RangeDN50 – DN200
ModelQB2
OrificeDouble (large + small)
Pressure RatingPN10 / PN16
End ConnectionDouble flanged
Flange DrillingBS EN 1092-2 (DIN 2501)
FunctionAir release during operation + air admission on vacuum
ServiceMunicipal water, irrigation, petrochemical, fire protection
Max. Working Temperature70 °C standard (EPDM) — NBR for 80 °C, FKM for up to 150 °C on request

Materials & Coating

BodyDuctile iron, epoxy coated
Internal TrimStainless steel (grade per order)
FloatStainless steel

Applications

Municipal water Irrigation networks Petrochemical Fire protection

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