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QDQ421F-25 pneumatic emergency shut-off valve


QDQ421F-25 pneumatic emergency shut-off valve
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  Product name : 气动紧急切断阀 QDQ421F pneumatic emergency shut-off valve Product model : QDQ421F-25
   Driving method : pneumatic Connection form : Flange  
   Structure form : Straight-through    Sealing material : Fluoroplastic
   Pressure range : 2.5MPa    Nominal diameter : DN25-DN80
   Common materials : Carbon steel, stainless steel    Technical consultation : 021-31007323

是国内著名〖 QDQ421F-25气动紧急切断阀 〗制造商,也是国内大型【 切断阀 】生产商之一,公司自成立以来始终围绕客户的需求并持续创新,为广大的代理商和企业客户提供〖QDQ421F-25气动紧急切断阀 〗解决方案,质量可靠,价格实惠,故畅销全国各地,欢迎新老客户来电,来函,我们将为您提供最优质的服务。 Hushan Valve Manufacturing (Shanghai) Co., Ltd. is a well-known domestic manufacturer of [ QDQ421F-25 pneumatic emergency shut-off valve ] and one of the large domestic [ cut-off valve ] manufacturers. Since its establishment, the company has always focused on customer needs and continued innovation. The vast number of agents and corporate customers provide the "QDQ421F-25 Pneumatic Emergency Shut-off Valve" solution, which is reliable in quality and affordable in price, so it sells all over the country. Welcome new and old customers to call us and send us a letter.


气动紧急切断阀 -- 产品概述 I. Pneumatic emergency shut-off valve - product overview

气动紧急切断阀 分为常开式和为常闭式,安装在液氨,燃气储罐 / 管道出口处紧急时能够快速切断的阀门,利用电磁阀来控制阀门的开启 - 关闭。 QDQ421F-25 pneumatic emergency cut-off valve is divided into normally open type and normally closed type. It is installed in liquid ammonia and can be quickly shut off at the gas storage tank / pipe exit. The solenoid valve is used to control the opening and closing of the valve . , 氨气或弱腐蚀性气体贮罐的安全保护阀门。 Widely used for safety protection valves of gas , ammonia or weakly corrosive gas storage tanks.

由多弹簧气动薄膜执行机构或浮动式活塞执行机构与调节阀组成,电磁阀线圈可接收泄露仪器的信号,控制工艺管道内流体的切断、接通或切换。 The pneumatic emergency shut-off valve is composed of a multi-spring pneumatic diaphragm actuator or a floating piston actuator and a regulating valve. The solenoid valve coil can receive signals from leaking instruments and control the cut-off, connection or switching of fluid in the process pipeline. The structure of the shut-off valve is equipped with a plug with a low melting point (fusible alloy). In the event of an accident, the temperature rises and the pressure is easily melted to release the pressure to quickly close the inlet and outlet of the storage tank to ensure the safety of the storage tank system. ≥0.3-0.6Mpa ,气缸的日常工作压力,不得低于 0.4MPa, 保证阀门的正常工作。 The opening pressure of the cylinder is ≥0.3-0.6Mpa , and the daily working pressure of the cylinder must not be lower than 0.4MPa to ensure the normal operation of the valve.

, 以便在管道或储罐上发生意外情况时,工作人员迅速通过控制室触动开关,电磁阀瞬间通电,气源快速通过关闭切断阀。 Normally open pneumatic emergency shut-off valve; has excellent technical performance, low load loss and high reliability. It is used in conjunction with long-distance gas sources. The gas source is used to control the closing of the valve in case of an accident on the pipeline or storage tank. The staff quickly touched the switch through the control room, the solenoid valve was energized instantly, and the gas source quickly passed the shut-off valve.

气动紧急切断阀 -- 性能规范 Second, the pneumatic emergency shut-off valve - performance specifications

DN Specification ( DN )

MPa Nominal pressure ( MPa )

MPa Sealing test pressure ( MPa )

Working temperature ( )

Applicable medium

Control cylinder or pneumatic part

MM Disc opening height ( MM )

Use medium

MPa Maximum oil pressure or air pressure when the disc is open ( MPa )

25

2.5

2.75

 

 

 

-40

 

~ 80

 

 

 

liquefaction

 

LPG,

 

Liquid ammonia

15

 

 

 

锭子油 2 # Spindle oil

 

Or ammonia

 

3MPa ,气 0.6MPa Oil 3MPa , gas 0.6MPa

40

2.5

2.75

18

3MPa ,气 0.6MPa Oil 3MPa , gas 0.6MPa

50

2.5

2.75

18

3MPa ,气 0.6MPa Oil 3MPa , gas 0.6MPa

65

2.5

2.75

twenty two

3MPa ,气 0.6MPa Oil 3MPa , gas 0.6MPa

80

2.5

2.75

27

3MPa ,气 0.6MPa Oil 3MPa , gas 0.6MPa

Third, the working principle and structure

1 . When the valve is operated without external pressure, the valve flap is normally closed. When used on a storage tank system, the emergency shut-off valve is used in conjunction with an oil pump or a gas cylinder. The valve is opened by hand pressure of oil or ammonia gas. The valve is open under the pressure of circuit or gas. When the valve needs to be closed or there is an emergency, the oil pressure or ammonia gas pressure can be released, and the valve will automatically close.

2 When the valve flap is closed, the pressure is achieved by opening the pressure relief valve or operating the handwheel or the fusible plug on the pipeline when the temperature increases.

3 The flow direction of the valve's working medium should be high in and low out, which is exactly the opposite of the flow direction of the ordinary shut-off valve.

4 . JB/T79.1-94 《凸面整体铸钢法兰》或 HG20592-97 尺寸标准。 The valve flange connection size is according to JB / T79.1-94 "Convex integral cast steel flange" or HG20592-97 size standard.

Fourth, the main external dimensions and connection dimensions (refer to the composition)

DN

L

D

D1

D2

b

F

Z-Ф

25

160

115

85

65

16

2

4-Ф14

32

180

135

100

78

18

2

4-Ф18

40

200

145

110

85

18

2

4-Ф18

50

230

160

125

100

20

3

4-Ф18

65

290

180

145

120

twenty two

3

8Ф18

80

310

195

160

135

twenty two

3

8-Ф18

100

350

230

190

160

twenty four

3

8-Ф23

125

400

270

220

188

28

3

8-Ф25

150

480

300

250

218

30

3

8-Ф25

200

600

360

310

278

34

3

12-Ф25

250

730

425

370

332

36

3

12-Ф30

300

850

485

430

390

40

3

16-Ф30

气动紧急切断阀 -- 注意事项 V. Pneumatic Emergency Shut-off Valve -- Precautions

,气动型切断阀气缸开启压力 ≥0.3-0.6Mpa ,气缸的日常工作压力,不得低于 0.4MPa, 保证阀门的正常工作。 1. The opening pressure of the pneumatic cut-off valve cylinder is ≥0.3-0.6Mpa , and the daily working pressure of the cylinder must not be lower than 0.4MPa to ensure the normal operation of the valve.

,切断阀采用止回阀原理,只能单向截断,安装时必须注意阀门标志,将要保护的一端作为阀门入口。 2. The shut-off valve uses the check valve principle, which can only be cut off in one direction. When installing, you must pay attention to the valve mark, and use the end to be protected as the valve inlet. When installing the valve, pay attention to: high in and low out.

,常闭式气动紧急切断阀不宜长时间开启,避免弹簧疲劳失灵。 3 , normally closed pneumatic emergency shut-off valve should not be opened for a long time to avoid spring fatigue failure.

,订货须注明法兰密封面形式,压力等级及连接标准。 4 , the order must indicate the flange sealing surface form, pressure level and connection standards.

 

 

 

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