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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

 Check valves, Swing, Piston, Bolted Bonnet, Pressure Seal, meeting API 602, API 594, BS 1868, GOST standards, for oil & gas, power, water, etc.
 

Check Valve Introduction: 

Check valves indicates a kind of valves in which the valve disc is automatically opened by the pressure produced by the flowing of the medium itself, and closed by the reverse pressure or the weight of the valve disc, so as to make the fluid flow toward one direction.The check valves include different types such as swing type, lift type and tilting disc type. Designed in accordance with specifications in API 6D, the full-open type check valves are applied in transportation lines for crude oil and natural gas. 

Check Calves Design and Product Range:

- Design basis: ASME B16.34, GB 12236, API 6D. 

- Flanged ends: ASME B16.5, GB 9113. 

- Butt-welding ends: ASME B16.25. 

- Face-to-face dimension: ASME B16.10, GB 12221. 

- Inspection and test: API 598, API 6D, JB/T 9092. 

- Pressure rating: Class 150 - 2500, PN16 - PN42.0 

- Product range: 2" - 36", DN50 - DN900 

- Materials of main parts: WCB, LCB, WC6, WC9, C5, CF8M, Alloy 20. 

- Trim materials: as per API 600. 

Check Calve Design Features: 

- Swing type valve disc. 

- Tilting disc type valve disc. 

- Bolted bonnet. 

- Pressure self-sealing type bonnet. 

- Suitable for horizontal and vertical installation. 

- Flanged ends 

- Butt-welding ends 

- Pressure self-sealing type bonnet 

- Overlay welding by hard alloy can be performed on the seat surface according to specifications in API 600. 

- Replaceable valve seat 

- Integral seat and back seat are adopted in stainless steel valves. 

- The built-in structure is adopted for connecting the pin and valve disc, so there is no external leakage point.