Air cushion valve qrda

STANDARD SPECIFICATION

Size Range

50mm to 300mm

Design

AWWA M 51

Type To Valve

Specially designed non – slam, surge dampening and suppressing

Pressure Rating

PN 10 /PN 16 / PN 20 & PN 25

Flanged End

IS: 1538 (Tab – 4 &6), On Request – BS/ ANSI/AWWA/ DIN/BSEN

Body & Other M.S. Parts

M.S. to IS: 2062 Gr. Fe-410-W

Seat

Brass

Ball Float

Wood (Rubber Coated)/S.S.

Air Inlet Valve

Mfr’s Std.

Air Outlet  Valve  (Adjustable)

Mfr’s Std.

Cushioning

Operate to break the vacuum where separation takes place and

reduce the inertia of returning water column by using air intake

Functioning

Discharges large quantities of air from the pipeline during pipe filling and admits large quantities of air during pipe drainage or at water column separation.

Air valve close when the pipe fills up with liquid, and does not reopen until pressure within the air valve (pipeline) drops below atmospheric pressure.

Special Features

• Alternately called Quick Release Dampped Air Valve (QRDA)
• Maximum flow efficiency and surge protection.
• To protect from water hammer damages
• To protect from vacuum enhanced problems and damages
• Available in Cast Iron & Ductile Iron