Leader Cast Steel Globe Valve
Leader Cast Steel Globe Valve: Technical Specifications & Industrial Guide
Leader Cast Steel Globe Valves are heavy-duty, linear-motion control valves designed for throttling, flow regulation, and tight shut-off in high-pressure, high-temperature steam and fluid pipelines. Manufactured to international design standards like API 600, BS 1873, and ASME B16.34, these valves feature a contoured plug and renewable seat ring configuration to withstand high fluid velocity, wire-drawing, and thermal shock.
Key Technical Specifications
|
Parameter |
Standard Specification |
|
Design Standards |
BS 1873 / API 600 / ASME B16.34 |
|
Testing Standards |
API 598 / BS EN 12266-1 |
|
Size Range |
DN 15 mm to DN 300 mm ($1/2''$ to $12''$) |
|
Pressure Class |
ASME Class 150, Class 300, Class 600, Class 900, Class 1500 |
|
Body & Bonnet Material |
Cast Carbon Steel (ASTM A216 Gr. WCB) | Alloy Steel (ASTM A217 Gr. WC6 / WC9) |
|
Trim Options (API Trim Nos.) |
Trim 1 (13% Cr), Trim 5 (Full Stellite), Trim 8 (13% Cr / Hardfaced Seat) |
|
Stem Design |
Outside Screw and Yoke (OS&Y), Rising Stem with Non-Rising Handwheel |
|
End Connections |
Flanged (ASME B16.5) / Butt-Weld Ends (ASME B16.25) |
Core Construction Features & Benefits
- Contoured Plug Design: Features a precision-guided parabolic or flat plug to allow smooth flow regulation and accurate throttling without seat chatter.
- Hardened Stellite Seating: Seating faces hardfaced with Stellite cobalt alloy resist erosion, wire-drawing, and high-velocity steam scouring for extended service life.
- Outside Screw & Yoke (OS&Y): External stem threading prevents process fluid contact with operating threads, easing lubrication and preventing thread corrosion.
- Backseat Arrangement: A precision-machined backseat allows gland packing repacking under full pressure while the valve is fully open.
- Heavy-Duty Bolted Bonnet: Standard spiral-wound SS 304/316 gaskets with graphite filler ensure a leak-tight body-to-bonnet seal under thermal cycling.
Primary Industrial Applications
- Steam Distribution Systems: Regulation and isolation of high-pressure saturated and superheated steam headers in power generation plants.
- Oil & Gas Refineries: Throttling duty on high-temperature hydrocarbon, naphtha, and crude oil transfer lines.
- Petrochemical & Chemical Processing: Flow control for boiler feedwater, condensate return, and non-corrosive chemical process loops.
- Fertilizer & Process Plants: Handling high-pressure utility water, steam blowdown, and thermal fluids.
