FIG. 8340 DOUBLE AIR RELEASE VALVE

Features:
Wide range of materials Aluminium Bronze, Super Duplex, Stainless Steel, Titanium, 6MO, Hastelloy & Gunmetal.

Double orifice air valve that combines both large orifice & small orifice functions within one unit. The large orifice allows air to be expelled from the system during filling of a pipeline and admit air back into the system whenever sub atmospheric pressure occurs.

Air is vented from the system until water enters the valve and lifts the float against its seat, ensuring a tight seal. In the event of sub-atmospheric pressure in the system, the water level drops causing the float to fall from its seat and allow the admission of air.
During normal working of the main the small orifice releases the air which accumulates under pressure. With the main in operation, the float is normally against its seat. As air enters the chamber body the water level is depressed until a level is reached when the float drops from its seat, which allows air to escape. The consequent rise in water level returns the float to its seat
Efficient low pressure sealing at 0.2bar.
25mm (1″) – 200mm (8″) sizes.

Suitable for:

Valve type:

Options

BSP or NPT threaded Inlet.
PN10,PN16, PN25, PN40, ANSI 125/150, ANSI 250/300. Flanged Inlet.
Flanged outlet.
Cowled outlet.
Throttled outlet.
Inflow / outflow check.
Surge arrestor.
Isolation valve*.
Finishes available in Rilsan, Epoxy, Bituminus, Red oxide &Aluminium.
EPDM or Viton rubber.
Material testing & Certification to international standards available on request.

* We recommend all air valves are fitted with isolation valves.

Technical Specification

PART

PARTS

AVAILABLE MATERIAL

1

Body

Aluminium Bronze, Super Duplex, Stainless Steel, Titanium, 6MO, Hastelloy, Monel, Inconel

 Gunmetal

2

Cover

Aluminium Bronze, Super Duplex, Stainless Steel, Titanium, 6MO, Hastelloy, Monel, Inconel

 Gunmetal

3*

Sheild Plate

Aluminium Bronze, Super Duplex, Stainless Steel, Titanium, 6MO, Hastelloy, Monel, Inconel

 Gunmetal

*(Spun steel on 150 & 200mm)

4

Large Orifice Seat

EPDM & Viton

5

Large Orifice Float

ABS & Stainless Steel

6

Small Orifice Float

ABS & Stainless Steel

7

Orifice Plug

ABS & Stainless Steel

8

Orifice Nut

ABS & Stainless Steel

9

Hinge Pin

Stainless Steel

10

Stop Screw

Stainless Steel

11

Small Orifice Seal

EPDM & Viton

12

Chamber O-ring

EPDM & Viton

13

Gasket, Orifice Plug

ABS & Stainless Steel

14

Shield Studs & Nuts

Aluminium Bronze, Super Duplex, Stainless Steel, Titanium, 6MO, Hastelloy, Monel, Inconel

 Gunmetal

15

Cover Bolts & Nuts

Aluminium Bronze, Super Duplex, Stainless Steel, Titanium, 6MO, Hastelloy, Monel, Inconel

 Gunmetal

16

Chamber Setscrews

Aluminium Bronze, Super Duplex, Stainless Steel, Titanium, 6MO, Hastelloy, Monel, Inconel

 Gunmetal

17

Chamber

Aluminium Bronze, Super Duplex, Stainless Steel, Titanium, 6MO, Hastelloy, Monel, Inconel

 Gunmetal

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