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Stainless Steel Flange Check Valve

- 316 stainless steel
- 150# flanged ends
- Bolted Cover
- Swing Type
- Horizontal or Vertical lines
- Welded Seat
- Renewable Seat Rings
- Steel valves ANSI B16.34
- Face to face ANSI B16.10
- End flanges ANSI B16.5
- Buttweld ends ANSI B16.25
- Inspection and test API 598


Check valves, also known as one-way check valves or check valves, are designed to prevent backflow of media in the line. The opening and closing parts are opened or closed by the medium flow and force to prevent the medium from flowing backwards. On pipes used for one-way flow of media, only the media is allowed to flow in one direction to avoid accidents. When the inlet side pressure is lower than the outlet side, the flap automatically closes the passage under the action of fluid pressure and its own weight.


Check Valve.pdf

Stainless Steel Flange Check Valve
Double Flap Check Valve
Double Flap Check Valve
Vertical Check Valve

Vertical Check Valve

Swing Check Valve

Swing Check Valve

  H41, H42 Specification


Nominal pressure 2.5 4.0 6.4 10.0  MPa
Shell test 3.75 6.0 9.6 15.0
High pressure sealing test 2.75 4.0 7.04 11.0
Low pressure sealing test 0.6
Applicable medium C
Water, Oil, Steam. Nitric, Acid. Acetic Acid LPG
Applicable temperature ≤425℃ ≤100℃ -40~+80℃
Main connection and external dimensions


  H44 Specification


Test pressure PN Nominal pressure
2.5 2.5 6.4 10
Shell test 3.75 6.0 9.6 15
Seal test(Liquid) 2.75 4.4 7.0 11
Seal test(gas)  0.6
Applicable medium C P R
Water, Oil, Steam. Nitric Acid Acetic Acid
Applicable temperature ≤425℃ ≤200℃ ≤200℃


  H71 Specification

This kind of check valve is among the products that introduced the advanced foreign technologies. This product adopts the abrasion proof alloy of good quality as the main sealing material and reduces the possibility that the pipe medium will check in low-pressure conditions. Popular among users, the product is widely used in industries of electric power, petroleum, chemical and refining. 


Nominal pressure 1.0 1.6 2.5 4.0
Strength test(water) 1.5 2.4 2.75 6.0
Hight seal test(water) 1.1 17.8 38.5 44
Type H71HWY- H71 HWY- H71HWY-
Material code C P R
Applicable medium Water, Steam, Air, Oil. Nitric Acid Aceticacid
Applicable temperature ≤425℃ ≤200℃ ≤200℃


  Swing check valve



1.    Design and manufacture comply with BS 1868,JIS B2071

2.    Face to face dimension comply

    ANSl150-2500Lb, ANSL B16.10

    JIS10/20K,JIS B2001

3.    Connection flange 

    ANSI 150-2500Lb, ANSL B16.5 

    JIS10/20K, JIS B2212, B2214 

4.    Test and inspection ace to API 598

Construction B.B,Swing Type

Main Material

WCB, WC6, WC9, CF8, CF8M, CF3, CF3M


  Double flap check valve

Double Flap Check Valve

Main technique number

Type Nominal PN(MPa) Test stre ngth pressure(MPa) Test seal Pressure(MPa)  Applicable temperature (℃) 





1.0 1.5 1.1 ≤80






1.6 2.4 1.76

Material for main parts

Name of part Body Disc Stem Spring Seat
Material Bowl-shaped, steel, Stainless steel. Bowl-shaped, steel, Stainless steel.





NBR, Stanless, steel 


  check valve

This valve is a safety device mounted in the pipeline or pump outlet to prevent the pump from inversed running due to the differential water hammer's shock in the pipeline when the pump stops and features a brand-new structure, small volume, light weight,small fluid resisteance, reliable seal, stable open-close, long duration, better energy-saving effect. 

Suitable for the pipeline related to water supply and drainage, fire-fighting, warming etc. Systems or the pump outlet to prevent both pump and pipeline from being damaged due to the water hammer produced when the medium flows back and form the silencing effect. 

Main technique number

Nominal pressure PN(mm) 1.0 1.6
Test pressure (Mpa) Shell strength 1.5 2.4
Sealing performance 1.1 1.76
Working temperature(℃) ≤80
Applicable medium Clean-water, Sea.
Slow-close time(S) 0~60

Material for main partes

Name of part Body Disc


Oil cylinder

Oil cork

Spring Seat






stainless stee

Stainless steel Stainless steel NBR


About Flowx

Through many years of research, development and field application experience, FlowX valve the company originated in Rome of Italy has migrated our own production facility to Shanghai of China and has been growing as fast as possible. Aiming at customer-central and quality-central makes FlowX more and more trusted by customers from various fields. 

We have designed and manufactured good valve products and control products that meet the stringent flow market`s requirements. FlowX is always providing personalized products and customer service; each batch of ordered product will be always delivered on-time. Meanwhile, FlowX seizes the opportunity and establish the FlowX (Hongkong) company which mainly engaged in FlowX Asia Pacific Sales and after-service. And FlowX Italy will focus on the business development of our own products in European market. 

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Today FlowX (Shanghai) has shifted the role to the head office of FlowX group, conducting the business and the production for the group company. Major products manufactured and provided are electric actuators, pneumatic actuators, ball valve, butterfly valve, gate valve, check valve and other series products. ISO, CE, GB and other products quality standard system certification were successfully acquired one by one in the past. 

Sanitary-Butterfly-Valve-with-Pneumatic-Actuator (3)


High Performance Butterfly Valve Metal Seat for Water Treatment Plant, Breweries, Drilling Rigs, Heating & Air Conditioning, Paper Industry, Chemical Industry, Gas Plant, Pneumatic Conveyors, Sugar Industry, Waste Effluent Treatment Plant, Cooling Water Circulation, Compressed Air.

High Performance Butterfly Valve Metal Seat Application