API 6D Axial Check Valves, ASTM A216 WCB, 20 Inch, CL400, RF

The API 6D Axial Flow Check Valve is a high-performance valve designed for industrial applications. It is manufactured according to ASME B16.34 standards using durable Carbon Steel ASTM A216 WCB. This valve features a 20-inch (DN500) size, Class 400 LB (PN64) rating, and a robust one-piece body construction. It is equipped with RF flanged ends for secure and reliable connections.

Product Name: API 6D Axial Flow Check Valves
Design Standard: API 6D, ASME B16.34
Body Material: ASTM A216 WCB
Size: 20 Inch, DN500
Pressure: Class 400 LB, PN64
End Connection: RF Flanged
Key Features: One-piece Body, Small Weight, Good Strength and Easy Maintenance

In addition to the general function of a check valve, the axial flow check valve offers the advantages of reduced noise and lower impact due to the use of a spring. With its axial flow design, the valve features low fluid resistance, high flow capacity, and a compact outer dimension, making it an excellent choice for use at the outlet of pumps in pipeline systems transporting oil and gas. It is suitable for use in pipelines transporting oil, gas, water, and other fluids, specifically for non-return applications.

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, CF3, CF3M, CF8C
» Design and Manufacture: GB/T 21387, API 6D, ASME B16.34
» Face to Face (End to End): GB/T 12221, ANSI B16.10, API 6D
» Flanged Connection: GB/T 9113, ASME B16.5
» Test and Inspection: GB/T 26480, API 598
» End Connections: Flanged (FF, RF, RTJ) to international standards
» Temperature Range: -29°C to 595°C
» Medium: Water, gas, oil, etc.

Product Features

» One-piece body, lightweight, strong, and easy to maintain.
» The spring's thrust force ensures the valve remains in the closed position even without the force of the medium.
» The high-quality sealing carrier allows the valve to be installed in any direction, with the disc perfectly sealing against the seat.
» The axial flow structure and precisely designed flow passage result in minimal pressure loss, stable medium flow, and prevention of cavitation erosion. The disc returns to the sealing position with the spring's force and the sub-pressure created by the medium flow, eliminating direct impact from the medium on the back of the disc. The axial flow check valve is a low-noise design.
» The special structure and surface treatment of the disc carrier and pin prevent valve sticking. The valve opens and closes evenly, avoiding the common defect of the disc failing to stay centered due to its gravity. This ensures excellent and lasting sealing performance.
» In the closed position, the precise design ensures that the spring's thrust force is slightly greater than the combined force of the disc's gravity and the friction between the disc and the sealing ring. This allows the disc to return to its sealing position under low pressure, regardless of the installation position, protecting the pump's operation.