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Check valve is an automatic valve, which is also called inverted valve or back valve.
It relies on the flow of the medium itself to automatically open and close the disc to prevent the backflow of the medium.
ln order to avoid any accidents the medium is limited for one-way flow.
Check valves are mainly divided into the following types according to their structure: swing check valve, lifting check valve and butterfly plate check valve.
Working Pressure:Class125/PN16/PN25
Flanged Standard:ANSI B16.1, ANSI B16.42,EN1092-2
Working Temperature:-20ºC- 120ºC
| NO | Name | Material | |
| Chinese Spec | ASTM Spec | ||
| 1 | Cover | QT450-10 HT250 | A536 65-45-12 ASTM 126-ClassB |
| 2 | Body | QT450-10 HT250 | A536 65-45-12 ASTM 126-ClassB |
| 3 | Shaft | 0Cr18Ni9 | ASTM A276 304 |
| 4 | Seat | ZCuSn10Zn2 | ASTM B62 |
| NPS | DN | L | Kv | Cv |
| 2 | 50 | 203 | / | / |
| 2 1/2 | 65 | 216 | / | / |
| 3 | 80 | 241 | 100.4 | 117.2 |
| 4 | 100 | 292 | 179.3 | 209.2 |
| 5 | 125 | 330 | / | / |
| 6 | 150 | 356 | 409.9 | 478.3 |
| 8 | 200 | 495 | 725.6 | 846.8 |
| 10 | 250 | 622 | 1101.7 | 1285.7 |
| 12 | 300 | 698 | 1602.9 | 1870.6 |
1, Automatic open and close under the medium pressure inside the pipe. It is a kind of automatic valve.
2, Prevent medium backflow, one direction flow.
3, Can attach spring kit or counter weight to help the disc close faster, this could eliminate damageable water hammer.
4, It can also attach the air cushion cylinder. At the beginning the valve close quickly. But when disc close to 70% close position, the air cushion cylinder will start to work and help the disc close slowly.
This could prevent the medium in the pipe to build up pressure and damage the pipe system.
Shanghai Flow Valve & Fitting Co, Ltd. was founded in 1998, mainly in foreign trade export business, has invested in two professional manufacturing factories in Shanghai Jiading Waigang Industrial Zone and Tianjin Wuqing Jingbin Industrial Park.
These two subordinate factories are responsible for the professional production of ANSl, DINBS, GB and other standards of ball valve, butterfly valve, gate valve, stop valve, balance valve, filter, plug valve, control valve and other series of products.
Nearly 80% of the company's products are exported to Europe, America, Middle East, Southeast Asia and other parts of the world and we also conduct technical cooperation and OEM production with many European and American companies.
Shanghai Flow Valve & Fitting Co., Ltd. began to actively participate in major domestic engineering projects in 2003.lt has established five sales centers in Shanghai, Beijing, Guangzhou, Xi'an and Chongqing, and its business covers Northeast China, North China, Northwest China,Southwest China, Central China, South China and other regions.The sales network and after-sales network basically cover most regions of mainland China.
Q1: Can I have a sample order for valve?
A1:Yes, we welcome sample order to test and check quality. Mixed samples are acceptable.Q2:Do you have any MOQ limit for valve order?
A2: Low MOQ, 1pc for sample checking is available.
Q3: How do you ship the goods and how long does it take to arrive?
A3: We usually ship by sea. It usually takes 30 days to arrive. Airline shipping also optional.
Q4:How to proceed an order for valve?
A4: Firstly let us know your requirements or application.
Secondly we quote according to your requirements or our suggestions.
Thirdly customer confirms the samples and places deposit for formal order.
Fourthly we arrange the production.
Q5:Do you offer guarantee for the products?
A5: Yes, we offer 1 year warranty to our products.
Q6: Why choose us?
A6: We are a manufacturer, we have been manufacturing for over 20 years.
