API 6D Axial Flow Check Valve, ASTM A351 CF8, 8 Inch, 150 LB

Product Name: API 6D Axial Flow Check Valve, One-piece Body
Design Standard: API 6D
Body Material: ASTM A351 CF8
Size: 8 Inch, DN200
Pressure: Class 150 LB, PN20
End Connection: RF Flanged

In addition to the general functionality of a check valve, the Axial Flow Check Valve offers several advantages, including reduced noise and lower impact due to the incorporation of a spring. Its axial flow design minimizes fluid resistance, providing high flow capacity while maintaining a compact outer dimension. These characteristics make the valve an ideal choice for installation on pump outlets in pipeline systems transporting oil and gas. It is specifically designed for non-return applications in pipelines carrying oil, gas, water, and other media.

Technical Specifications

» Nominal Diameter: NPS 2–36 Inch (DN50–DN900)
» Design Pressure: Class 150–2500 LB (PN10–PN420)
» Materials: ASTM A216 WCB, WCC, A217 WC6, WC9, C5, C12A, A352 LCB, LCC, A351 CF8, CF8M, CF3M, CF8C
» End Connections: Flanged (FF, RF, RTJ) to international standards
» Design and Manufacture Standards: GB/T 21387, API 6D, ASME B16.34
» Face-to-Face (End-to-End): GB/T 12221, ANSI B16.10, API 6D
» Flanged Connection Standards: GB/T 9113, ASME B16.5
» Test and Inspection Standards: GB/T 26480, API 598
» Temperature Range: -29°C to 595°C
» Medium: Water, gas, oil, etc.

Product Features

» One-Piece Body: Lightweight, durable, and easy to maintain, offering robust strength in a compact design.
» Spring Thrust Force: The spring’s thrust ensures the valve remains in the closed position, even without medium flow, providing reliable sealing performance.
» Versatile Installation: The valve can be installed in any orientation, thanks to its superior sealing carrier. The disc seals perfectly against the seat for optimal performance.
» Axial Flow Structure: Designed with a precise flow passage to minimize pressure loss, ensuring stable medium flow and preventing cavitation erosion. The disc returns to the closed position using spring force and sub-pressure generated by the medium flow, avoiding direct impact on the backside of the disc. This design results in a low-noise operation.
» Durable Disc Carrier: The specially designed structure and surface treatment of the disc carrier and pin prevent valve sticking, allowing smooth opening and closing. This design ensures that the disc remains centered and achieves a perfect seal, eliminating common issues of misalignment due to gravity.
» Reliable Sealing: The spring's thrust force is slightly greater than the combined effect of the disc’s gravity and friction with the sealing ring. This ensures that the disc returns to its sealing position under low pressure, regardless of installation orientation, safeguarding pump operation.