API 6D/BS 1868 Swing 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 Swing Check Valves body structure is available in Cast Steel.Swing check valve is suitable for various operating conditions of pipeline for petroleum, chemical, pharmaceutical, chemical fertilizer and electric power industry. Swing check valve is suitable for clean medium like water, oilsteam, acid medium, and not suitable for medium with solid particles and great viscosity


Design standard: BS 1868/API 6D
Length of structure: ASMEB16.10/API 6D
Flange connecting end: ASME B16.5/ASME B16.47
Butt welding connecting end: ASME B16.25
Wall thickness: ASME B16.34
Inspection and test: API 598 /API 6D
Pressure and temperature rating: ASME B16.34
Product scope: NPS 2” – NPS 48”, CL150-CL2500
Main body material: WCB, LCB, WCC, WC6, WC9, CF8, CF8M, CF3, CF3M, A890 4A etc.


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