Pressure Seal Bonnet Globe Valve, BS 1873, A217 WC9, 4 Inch

Product Name: Pressure Sealed Bonnet Globe Valve
Design Standard: BS 1873, ASME B16.34
Body Material: ASTM A217 WC9
Size: 4 Inch, DN100
Pressure: Class 2500 LB, PN420
End Connection: BW
Operation: Handwheel

Pressure Seal Globe Valves are specifically designed for high-temperature and high-pressure applications, complying with BS 1873 and ASME B16.34 standards. These valves are widely used in fossil fuel power plants and offer superior sealing compared to bolted bonnet joint valves. The pressure seal design ensures a compact and rigid structure, resulting in more reliable sealing at high temperatures and pressures, as well as cost-effective maintenance. The two openings for medium flow in and out are aligned in the same direction, forming an angle of 180°. The seat and disc sealing surfaces are overlaid with durable materials such as iron-base alloy, Co-base alloy, or carbide alloy for extended service life. For larger valves, a main disc and vice disc design is used to reduce operational torque and improve seat tightness.

Technical Specification

» Nominal Diameter: NPS 2-24 Inch (DN50-DN600)
» Design Pressure: Class 6002500 (PN10PN420)
» Material: ASTM A216 WCB, WCC, A217 WC6, WC9, A351 CF8, CF8M, CF3, CF3M
» End Connection: RF, RTJ, BW
» Temperature Range: -29°C to 595°C
» Medium: Water, gas, oil, etc.
» 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
» Key Components:
   A. Back-Up Ring: Absorbs thrust applied by internal pressure
   B. Thrust Ring: Protects the soft metallic gasket from deformation
   C. Gasket: Unique angular design provides superior sealing

Product Features

» Short Stroke Enables quick and easy open/close operation
» Relief Cone for Large Sizes and High Pressure: Internal bypass for pressure relief
» Disc Sealing Options: Available in flat sealing or throttle cone (regulating disc)
» Body Seat: Can be threaded or welded for flexibility
» Stellite Overlay: Full stellite overlay on seat sealing surfaces for enhanced durability
» Manufacturing and Maintenance: Designed for easy production and maintenance
» Back Seat Sealing Structure Ensures additional sealing protection
» Graphite Packing: Flexible and woven graphite packing for reliable sealing
» Reduced Port Optimizes flow control for specific applications