Low Pressure Air Valves D040LP

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  • Description

 

 


D-040 L


 

PN 10 / 16


 

Water Supply

 

Combination Air Valve for Small Suspended Solids for Low-Pressure Systems

 

Description

The D-040 L Combination Air Valve has the features of both an air release valve and an air & vacuum valve in a single body. This air valve is specifically designed to operate with liquids containing small suspended solids.

The air release component is designed to automatically release small pockets of air to the atmosphere as they accumulate along a pipeline or piping system when it is full and operating under pressure.

The air & vacuum component is designed to automatically discharge or admit large volumes of air during the filling or draining of a pipeline or piping system. This air valve will open to relieve negative pressures whenever water column separation occurs. The valve’s unique design enables the separation of the liquid from the sealing mechanism and assures optimum working conditions.

 

Applications

- Water transmission lines.

 

Operation

The air & vacuum component, with the large orifice, discharges air at high flow rates during the filling of the system and admits air into the system at high flow rates during its drainage and at water column separation.

High velocity air will not blow the float shut. Water will lift the float, which seals the valve.

At any time during system operation, should internal pressure of the system fall below atmospheric pressure, air will enter the system. The smooth discharge of air reduces pressure surges and other destructive phenomena.

The intake of air in response to negative pressure protects the system from destructive vacuum conditions and prevents damage caused by water column separation. Air entry is essential to efficiently drain the system.

The air release component releases entrapped air in pressurized systems.

 

Without air valves, pockets of accumulated air may cause the following hydraulic disturbances:

- Restriction of effective flow due to a reduction of the flow area. In extreme cases this will cause complete flow stoppage.

- Obstruction of efficient hydraulic transmission due to air flow disturbances.

- Acceleration of cavitation damages.

- Increase in pressure transients and surges.


 

- Internal corrosion of pipes, fittings and accessories.

- Dangerous high-energy bursts of compressed air.

- Inaccuracies in flow metering.

 

As the system starts to fill with liquid, the valve functions according to the following stages:

 

1. Air/gas is discharged by the air valve.

2. When the liquid enters the air valve, the float buoys up, pushing the sealing mechanism to its sealing position.

3. The entrapped air is confined in a pocket between the liquid

and the sealing mechanism. The air pressure is equal to the system pressure.

4. Increases in system pressure compress the trapped air. The remaining air gap enables the separation of the liquid from the sealing mechanism.

5. Entrapped air/gas, accumulating at peaks and along the system, rises to the top of the air valve and displaces the liquid in the air valve body.

6. When the liquid level is lowered to a point where the float is no longer buoyant, the float drops, unsealing the rolling seal. The air release orifice opens and allows part of the air that accumulated in the valve to be released to the atmosphere.

7. Liquid enters the valve. The float rises, pushing the rolling seal to its sealing position. The remaining air gap prevents the solids- laden liquid from reaching the sealing mechanism.

 

When internal pressure falls below atmospheric pressure (negative pressure):

 

1. The float will immediately drop down, opening the air & vacuum and air release orifices.

2. Air will enter the system.

 

Main Features

- Working pressure range: Polypropylene: 0.02 - 10 bar

St.St. SAE 316 / Duplex / Reinforced Nylon / PVDF: 0.05 - 16 bar - Testing pressure: 1.5 times the maximum working pressure

- Maximum working temperature: 60°C.

- Maximum intermittent temperature: 90°C.

- Builds an air gap that separates the liquids with suspended particles from the sealing mechanism.

- Dynamic design allows for high capacity air discharge while preventing premature closure.

- Lightweight, small dimensions, simple and reliable structure.

- The discharge outlet enables the connection of a vent pipe

- The large size of the automatic air release orifice relative to the airText Box: EnC-D040LWTR-15

D-040 L

 

valve body:

• Releases air at high flow rates.

• Lessens the danger of its obstruction by debris.

• The valve’s rolling seal mechanism design is less sensitive to different pressures than a direct float seal, thus enabling a one size orifice for a wide pressure range (up to 16 bar).

- The body is made of high-strength materials and all operating parts are made of specially selected, corrosion- resistant materials.

- Due to its light weight, the valve may be installed on plastic piping systems, as well as other lightweight piping systems.

 

Valve Selection

- Available in male threaded sizes: 1/2”, 3/4”, 1”, 2” - BSP / NPT and 2” flanged

- The D-040 L series air valve is available as:

D040 L-V -With a one-way, out-only attachment, allows air


 

discharge only, prevents air intake (all models).

D-040 L-I -With a vacuum breaker, in-only attachment, allows air intake only, not allowing air discharge (D-040 L 2”only).

D-040 L-NS -With a non-slam, discharge-throttling attachment, allows full air intake, throttles air discharge (D-040 L 2”only).

 

Note

For best suitability, it is recommended to send the fluid chemical properties along with the valve request.

Upon ordering, please specify: model, size, working pressure, thread and flange standard and type of liquid.

Text Box: 2

D-040 L

 

DIMENSIONS AND WEIGHTS

 

Model 1/2” 3/4” 1”


 

Dimensions mm

A B


 

Connections

C


 

Weight

Kg.


 

Orifice Area mm

A / V Auto.

 

PP / Nylon / PVDF STST / Duplex


 

99

 

94


 

227

 

216


 

3/8” BSP Female

 

3/8” BSPT Female


 

0.6 7.8 100

 

1.7 7.8 100


 

A


 

1

 

PARTS LIST AND SPECIFICATION

 

No. Part Material

 

1. Body Polypropylene/ Reinforced Nylon / PVDF 2. O-Ring BUNA-N / Viton

 

3. Discharge Outlet

Polypropylene

 

4. Rolling Seal

EPDM / Viton

 

5. Clamping Stem

Polypropylene

 

6. Float

Foamed Polypropylene

 

7. O-Ring

BUNA-N / Viton

 

8. Extension

Polypropylene/ Reinforced Nylon / PVDF

 

9. Closed Port* (default)

 

10. Base

Polypropylene/ Reinforced Nylon / PVDF

 

11. O-Ring

BUNA-N / Viton

 

* Optional Threaded Open Port


 

B


 

C


 

2

 

3

 

4

 

5

 

6

 

7

 

8

 

9

 

10

 

11

 

- 1/8” BSP/NPT with Schrader Valve - 1/8” BSP/NPT with Plug

 

Abertura cerrada


 

Tapón


 

Válvula Schrader


 

1

 

C


 

2

 

3

 

4

 

PARTS LIST AND SPECIFICATION


 

5

 

No. Part

 

1. Cover

 

2. Air Release Outlet

 

3. O-Ring

 

4. Rolling Seal

 

5. Clamping Stem

 

6. Extension

 

7. Float

 

8. O-Ring

 

9. Base


 

Material

 

Stainless Steel SAE 316 / Duplex Polypropylene

 

BUNA-N / Viton

 

EPDM / Viton

 

Reinforced Nylon

 

Stainless Steel SAE 316 / Duplex Foamed Polypropylene

 

BUNA-N / Viton

 

Stainless Steel SAE 316 / Duplex


 

B


 

6

 

7

 

8

 

9

 

A

Text Box: 2

D-040 L

 

DIMENSIONS AND WEIGHTS

 

Size


 

Dimensions mm

A B


 

Connections

C


 

Weight

Kg.


 

Orifice Area mm

A / V Auto.

 

2"


 

183


 

346


 

1½” BSP Female


 

2


 

12


 

804

 

PARTS LIST AND SPECIFICATION

 

No. Part

Material

 

1. Body

Polypropylene/ Reinforced Nylon / Stainless Steel / PVDF

 

2. O-Ring

BUNA-N / Viton


 

A


 

C


 

1

 

2

 

3

 

3. Discharge Outlet

 

4. Rolling Seal Assembly:

 

4a. Screws

 

4b. Plug Cover

 

4c. Rolling Seal

 

4d. Plug

 

5. Clamping Stem


 

Polypropylene

 

Stainless Steel

 

Reinforced Nylon

 

E.P.D.M.

 

Reinforced Nylon

 

Polypropylene


 

B


 

4

 

5

 

6

 

7

 

8

 

9

 

6. Float

 

7. O-Ring

 

8. Extension

 

9. Closed Port* (default)


 

Foamed Polypropylene

 

BUNA-N / Viton

 

Polypropylene/ Reinforced Nylon / Stainless Steel / PVDF


 

4c


 

4b


 

10

 

11

 

4a

 

10. Base

 

11. O-Ring

 

* Optional Threaded Open Port


 

Polypropylene/ Reinforced Nylon / Stainless Steel / PVDF BUNA-N / Viton


 

4d

 

- 1/8” BSP/NPT with Schrader Valve - 1/8” BSP/NPT with Plug

 

Abertura cerrada | Tapón | Válvula Schrader

 

A.R.I. FLOW CONTROL ACCESSORIES Ltd. www.arivalves.com ari@ari.co.il Tel: 972-4-6761988

 

A.R.I. FLOW CONTROL ACCESSORIES Ltd. reserves the right to make product changes without prior notice. To insure receiving updated information on parts specifications, please call the export dept. at the A.R.I. factory. A.R.I. FLOW CONTROL ACCESSORIES Ltd. shall not be held liable for any errors. All rights reserved.