Check Valve
A check valve is a passive fluid flow control device that allows fluid to flow in only one direction. 1 It prevents backflow by automatically closing when the flow reverses.
Common types include swing, ball, and lift check valves, each with varying mechanisms for opening and closing.
Check valves are essential in various applications, such as plumbing systems, water supply lines, and industrial processes, to protect equipment and prevent fluid from flowing in the wrong direction. 4
Swing Check Valve
A Swing Check Valve is a type of one-way valve that allows fluid to flow in only one direction, automatically closing when the flow reverses to prevent backflow. It features a hinged disc or valve element that swings open when fluid flows in the correct direction and swings shut when flow stops or reverses.
Swing check valves are commonly used in pipelines, pumps, and drainage systems to protect equipment and maintain proper flow direction in industries like water treatment, oil and gas, and HVAC. Their simple yet effective design makes them reliable for preventing reverse flow in a wide range of applications.
| Size |
25 - 500mm (CLASS 150#)
25 - 500mm (CLASS 300#) 25 - 300mm (CLASS 600#) |
| Pressure | 150#, 300#, 600# |
| Material | WCB, WCC, LCB, LCC, CF8, CF8M, CF3, CF3M,
CF8C, CN7M, CD4MCU, CG8M, CG3M, CW12MW, CD3MWCUN, CK3MCUN, CW6MC |
| Design | BS 1868 / ANSI B 16.34 |
| Face to Face | ANSI B 16.10 |
| End Connection |
ANSI B 16.5 / BS 10 / DIN / ANSI B 16.25
|
| Testing | API 598 / BS 6755 PART-1 |
| Type | SWING TYPE / LIFT TYPE |
Swing Check Valve
Dual Plate Check Valve
A Dual Plate Check Valve is a type of non-return valve that uses two hinged plates to prevent backflow and allow fluid to flow in only one direction. When flow is in the correct direction, the plates open, and when flow reverses, the plates close to block reverse flow, ensuring a tight seal.
This type of valve is compact, lightweight, and ideal for high-flow systems in industries like oil and gas, water treatment, and power generation, where reliable backflow prevention and space efficiency are crucial.
| Size | 50 - 600mm |
| Pressure | 150#, 300# |
| Material |
WCB, WCC, LCB, LCC, CF8, CF8M, CF3, CF3M, CF8C,
CN7M, CDAMCU, CG8M, CG3M, CW12MW, CD3MWCUN, CK3MCUN, CW6MC |
| Design | API 594 / API 6D / ANSI 16.34 |
| Face to Face | API 594 / API 6D |
| End Connection |
WAFER / DOUBLE FLANGED TYPE
|
| Testing | API 598 |
| Type | SPRING LOADED DUAL PLATE |
| Seat | RESILIENT / METAL SEAT |
| Operation | HAND WHEEL, CHAIN WHEEL, BEVEL GEAR,
HYDRALIC, ELECTRIC, PNEUMATIC ACTUATORS |
Dual Plate Check Valve
Slam Type Check Valve
A slam-type check valve is a type of swing check valve designed to prevent backflow by using a disc or flap that rapidly closes when the flow direction reverses, effectively "slamming" shut. This quick closure minimizes the risk of backflow and water hammer, making it ideal for systems where preventing reverse flow and protecting equipment from pressure surges is essential.
Commonly used in high-pressure pipelines, HVAC systems, and water treatment plants, slam-type check valves offer a simple yet effective solution for ensuring the unidirectional flow of fluids.
| Size | 15 - 450mm |
| Pressure | PN 10 |
| Material | WCB, WCC, LCB, LCC, CF8, CF8M, CF3, CF3M,
CFSC, CN7M, CD4MCU, CG8M, CG3M, CW12MW, CD3MWCUN, CK3MCUN, CW6MC |
| Design | API 594 / ANSI 16.34 |
| Face to Face | API 594 |
| End Connection |
WAFER TYPE
|
| Testing | API 598 |
| Type | WAFER TYPE SANDWICH |
Slam Type Check Valve
Non -Slam Type Check Valve
A non-slam type check valve is designed to prevent backflow without the abrupt closing action associated with slam-type check valves. Instead of a rapid closure, the valve features a controlled, gradual closing mechanism, which helps to reduce water hammer and pressure surges, providing smoother operation and less stress on the system.
Non-slam check valves are commonly used in critical applications such as water and wastewater treatment, pump stations, and industrial systems, where gentle closure and the protection of equipment from pressure spikes are essential.
| Size | 15 - 150MM |
| Pressure | 150# |
| Material | WCB, WCC, LCB, LCC, CF8, CF8M, CF3,
CF3M, CF8C, CN7M, CD4MCU, CG8M, CG3M, CW12MW, CD3MWCUN, CK3MCUN, CW6MC |
| Design | API 594 / ANSI 16.34 |
| Face to Face | API 594 |
| End Connection |
WAFER TYPE
|
| Testing | API 598 |
| Type | WAFER TYPE SANDWICHE |
