ASTM A890 4A Swing Check Valve, API 6D, 8 IN, CL900, BB, RTJ

The ASTM A890 4A Swing Check Valve is designed to API 6D standards, featuring a duplex stainless steel body for enhanced strength and corrosion resistance. It has a bolted cover/bonnet design, ensuring secure and reliable operation. With an 8-inch (DN200) diameter and a Class 900 LB pressure rating, equivalent to PN150, this valve is built for high-performance applications. The RTJ flanged ends provide a tight seal, making it suitable for critical industrial systems.

Product Name: Bolted Cover/Bonnet Swing Check Valve
Design Standard: API 6D
Body Material: ASTM A890 4A
Size: 8 Inch, DN200
Pressure: Class 900 LB, PN150
End Connection: RTJ Flanged

Universal Cast Steel Check Valves are designed and manufactured in strict accordance with international standards, including API 6D, BS 1868, ASME B16.34, or equivalent specifications. These valves are engineered to minimize flow resistance and pressure drop, offering efficient performance. Suitable for horizontal pipeline installation, the valve features a lapped and screwed seat ring that ensures tight shutoff and long-lasting service.
The valve's disc is precisely designed, machined, and guided to enable automatic shutoff at zero pressure. With a compact structure and low emission service, swing check valves provide reliable performance. In the standard configuration, the valve has a bolted cover and a free-swinging clapper, which responds to prevailing flow conditions.
Swing check valves are most effective when installed horizontally, though the heavier weight of the disc may sometimes lead to chattering issues. In such cases, dampers or counterweights should be added to ensure smooth operation.

Technical Specifications

» Nominal Diameter: NPS 2–24 Inch (DN50–DN600)
» 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
» End Connections: Flanged (FF, RF, RTJ) to international standards
» Design and Manufacture Standards: BS 1868, API 6D, DIN 3352
» Face-to-Face (End-to-End): ANSI B16.10, EN 558 Series
» Flanged Connections: ASME B16.5, ASME B16.47, EN 1092 Series
» Butt Welded End: ANSI B16.25
» Test and Inspection Standards: API 598, ISO 5208, EN 12266-1
» Temperature Range: -29°C to 595°C
» Medium: Water, gas, oil, etc.

Product Features

» Backflow Prevention: The cast steel swing check valve is designed to prevent backflow in the pipeline. The flow follows a straight path through the valve, resulting in minimal pressure drop.
» Automatic Shutoff: The disc swings open as the media flows through the line, and back pressure holds the disc in the closed position to prevent reverse flow.
» Installation Flexibility: These valves can be installed in both horizontal and vertical lines, but must be positioned correctly according to the flow direction arrow marked on the valve body.
» Customizable Accessories: Various accessories, such as bypasses, locking devices, and counterweights, are available to meet specific customer requirements.