BS 1873 PSB Globe Valve, ASTM A217 WC9, 12 Inch, 2500 LB, BW

Product Name: BS 1873 Pressure Seal Bonnet Globe Valve
Design Standard: BS 1873, ASME B16.34
Body Material: ASTM A217 WC9
Size: 12 Inch, DN300
Pressure: Class 2500 LB, PN420
End Connection: BW
Operation: Bevel Gear

The pressure seal globe valves are designed in accordance with BS1873 and ASME B16.34, making them suitable for high-temperature and high-pressure applications. They are widely used in fossil fuel power plants. Compared to bolted bonnet joint valves, these pressure seal valves offer absolute reliability in bonnet joint sealing. This design makes the valves more compact, rigid, and cost-effective for maintenance, especially in high-temperature and high-pressure services.
The two openings for medium flow are aligned in the same direction, forming a 180° angle. The seat and disc seal surfaces are overlaid with iron-based alloy, cobalt-based alloy, or carbide alloy for enhanced durability. For larger size valves, a main disc and secondary disc design is employed. The medium flows from the upper disc to the lower disc, significantly reducing the operating torque and ensuring more reliable seat tightness.

Technical Specifications

» Nominal Diameter: NPS 2–24 Inch (DN50–DN600)
» Design Pressure: Class 600–2500 LB (PN10–PN420)
» Materials: ASTM A216 WCB, WCC, A217 WC6, WC9, A351 CF8, CF8M, CF3, CF3M, A352 LCB
» End Connection: RF, RTJ, BW
» Design and Manufacture: ANSI B16.34, BS 1873
» Face to Face (End to End): ANSI B16.10
» Flanged Connection: ANSI B16.5
» Butt Welded End: ANSI B16.25
» Test and Inspection: API 598
» Temperature Range: -29°C to 595°C
» Medium: Water, Gas, Oil, and other Fluids
» Key Components:
  A. Backup Ring: Absorbs internal pressure-induced thrust
  B. Thrust Ring: Protects the soft metallic gasket from deformation
  C. Gasket: Unique angular design for superior sealing

Product Features

» Short Stroke: Allows for quick and easy open/close operation.
» Large Size and High Pressure: Relief cone with internal bypass for improved performance in demanding conditions.
» Disc Sealing Options: Available in flat sealing or throttle cone for regulating disc applications.
» Body Seat Options: Can be configured with either threaded or welded seats.
» Full Stellite Overlay: Seat sealing surface enhanced with a full stellite overlay for durability.
» Manufacturing and Maintenance Friendly: Designed for efficient manufacturing processes and easy maintenance.
» Back Seat Sealing Structure: Incorporates a back seat sealing design for added reliability.
» Flexible Packing: Uses flexible, woven graphite collaboration-type packing for improved sealing performance.
» Reduced Port: Features a reduced port design for specific applications.