Triple functions air valve type "D" 4000 – 6000 – 9000

Triple functions air valve type "D" 4000 – 6000 – 9000

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Main features

Low and high pressure air relief valve (double effect):the device evacuates great air amounts during the filling of the main, allows the inlet of great air amounts (in order to avoid a vacuum effect) during the emptying of the main and evacuates small air amounts that are accumulated in the high points of the main during normal working conditions

Material and coating

Standard version

Item

Quantity

Description

Material

Coating

01

01

Body

Ductile iron GS 400-15

Blue epoxy 250 microns

02

01

Upper flange

Ductile iron GS 400-15

03

01

Cover

Ductile iron GS 400-15

04

01

Protection grid

Stainless steel A2

05

01

Cover

Stainless steel A2

06

04

Threaded bar

Stainless steel A2

07

08

Nut

Stainless steel A2

08

04

Washer

Stainless steel A2

09

04

Screw

Stainless steel A2

10

04

Nut

Stainless steel A2

11

04

Washer

Stainless steel A2

12

01

Float

ABS

13

01

Float guide

ABS

14

01

Ring

ABS

15

01

Gasket seat

ABS

16

01

Lip seal

EPDM

17

01

Float

ABS

18

01

Nozzle

PA6.6 Polyamide

19

01

Nut

ABS

20

01

Gasket

EPDM 55

21

01

O-ring

EPDM 55

22

01

Gasket

EPDM 55

23

01

Adjusting screw

Stainless steel A2

24

01

Pin

Stainless steel

25

01

Air valve

Brass

Reinforced version

Item

Quantity

Description

Material

Coating

01

01

Body

Ductile iron GS 400-15

Blue epoxy 300 microns

02

01

Upper flange

Ductile iron GS 400-15

03

01

Cover

Ductile iron GS 400-15

04

01

Protection grid

Stainless steel A4

05

01

Cover

Stainless steel A4

06

04

Threaded bar

Stainless steel A4

07

08

Nut

Stainless steel A4

08

04

Washer

Stainless steel A4

09

04

Screw

Stainless steel A4

10

04

Nut

Stainless steel A4

11

04

Washer

Stainless steel A4

12

01

Float

ABS

13

01

Float guide

ABS

14

01

Ring

ABS

15

01

Gasket seat

ABS

16

01

Lip seal

EPDM

17

01

Float

ABS

18

01

Nozzle

PA6.6 Polyamide

19

01

Nut

ABS

20

01

Gasket

EPDM 55

21

01

O-ring

EPDM 55

22

01

Gasket

EPDM 55

23

01

Adjusting screw

Stainless steel A4

24

01

Pin

Stainless steel

25

01

Air valve

Brass

Kinetic principle

Pipeline filling During the filling of the pipe,the air evacuates, the float remains in low position. The water fills gradually the air relief valve, under the effect of the Archimedesthrust the edge of the seal ring and the surface of the float allows to have a tightness.The flow of the high orifice pressure being far more weak, it remains a air feeder thatevacuates slowly and allows a slow placement in pressure of the valve avoiding eater hammer. The unit is in under pressure and orifices of evacuation are sealed. Pipeline degassing The air accumulates during the functioning of the pipe.The low pressure float remains in place under the effect of the pressuredespite the decline of the level of the water.The air evacuates by the small orifice with the same mechanism that the precedingparagraph 2. Pipeline emptying In case of emptying of the network or rupture of the pipe,the low pressure float instantaneously allowing the arrivalof air and avoiding the placement in depression of the conduct.

Performances

Air flow large orifice

Air flow small orifice

Constant flow from 1 bar (10MCE)

PFA in Bar (all DN)

16

25

Ø nozzle in mm

2,25

1,75

Air flow in m3/h at pipe pressure

2,79

1,69

Hydraulic sealing: sealing wraps to 1.5 PN - sealing low pressure starting from 0.3 bars for small (nozzle) and large openings.

Solutions