API 602 Check Valve

Check valves serve an important application—namely to prevent flow in one direction while allowing it in the other. A check valve is self-actuated and designed to prevent fluid from flowing back into the system (prevent reverse flow). Real-life applications include preventing backflow into an injection line or into a pump. The fluid flow opens the valve by forcing a disk or ball in one direction. When the flow stops, the disk or ball is seated and closes the valve. They can be installed in horizontal or vertical upward flow piping. ZAF forged check valve three different design piston check valve, ball check valve & swing check valve



Design standard: API 602/ BS 5352
The length of the structure: Length of structure of socket welding / thread end of forged steel gate valve is manufactured by factory standard=ASME B16.10
The length of structure of flange/ butt welding end of forged steel gate valve is manufactured by ASME B16.10
Flange connecting end: ASME B16.5
Butt welding connecting end: ASME B16.25
Wall thickness: API 602/ASME B16.34
Inspection and test: API 598
Pressure and temperature rating: ASME B16.34
Product scope: NPS ½″~NPS 2″  (DN15~DN50)  CL150~CL2500
Main body material: A105, LF2, F11, F22, F51, F91, F304, F316, F304L,F316L etc.
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