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Composite Exhaust Air Valve

 

DN:DN50—DN200
Nominal pressure (MPa): PN1.0—1.6Mpa
Medium: Fresh water, sewage, sea water, weak acid,weak base etc
Temperature: -20℃—120℃
Body material: cast iron, ductile iron
Flange connection: DIN PN10.PN16, ANSI150,BS4504

Categories

Tel: +86 18538315922
Fax: +86-371-55883235
E-mail: weisidun@wsdvalve.com
Address: ZhengZhou,HeNan,China.

 

Product Introduction

This product is used at the highest point of pipelines, the place where air is shutoff, or the outlets of pumps in order to eliminate air and dredge pipelines. If the vent valve is not set, the air in the pipeline will be possibly shutoff at any time, and the water content will not meet the design requirement. If the electricity is suddenly cut off when the pipeline is at work, the negative pressure in the pipeline will cause vibration or cracking. In this case, the vent valve can quickly inhale air into the pipeline and prevent the vibration and cracking of it.

 

Operation Principle

There are two holes in the compound vent valve, one big, one small. The diameter nearly equals DN. The first time water is passed in the pipeline, a large amount of air will be released through the big hole. Immediately the air is completely removed, the big hole stops working. When the pipeline is at work, air cells will be generated. And air cells will grow bigger while move to the upper part of the pipeline, which will have a negative influence on the flow of water. At this moment, these air cells can be removed through the small hole. Therefore no air can exist in the pipeline. When the electricity is cut off, the pump does not work , or there is no water flow in the pipeline, negative pressure will be generated and there will be a great need of air in the pipeline. In order to inhale a lot of air, a floating ball will fall and open the small hole which will drive the opening of the big hole.

 

Warning:The working pressure of vent valve cannot be over 0.02MPa, if not, water will be leaked. And this valve should be equipped with another valve for its maintenance.

 

 

 

Parameters

Technical Parameters

 

1.Working pressure:1.0MPa

2.Medium: water

3.Applicable temperature:constant temperature

4.Body:gray iron HT200

5.Floating ball and piston: stainless steel

6.Packing material:ding clear rubber

 

 

CARX type dimensions

 

DN(mm)

D

D1

D2

L

L1

H

Z-Φ d

25

115

85

65

235

180

355

4-14

50

160

125

102

325

205

450

4-18

80

195

160

138

365

235

500

4-18

100

215

180

158

385

258

535

8-18

 

 

 

 

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