Gate Valves
Gate valves are bolted-bonnet, OS&Y, flexible-wedge designs built to API 600 and ASME B16.34. They cover sizes 2"–88" (DN50–DN2200) and pressure classes 150–4500 for demanding refinery, chemical, coal chemical, power and pipeline transmission service.
Design Features & Core Benefits
Flexible Wedge & Guided Travel
Flexible wedge design compensates for seat distortion and piping loads, while integral body guides keep the wedge self-centering through the full stroke for reliable shutoff.
Robust Body–Bonnet Sealing
Graphite or spiral-wound gaskets for Class 150–600 and ring-type joints for Class 900 and above provide reliable body–bonnet sealing at high temperature and pressure.
Wide Material & Trim Range
Full cast steel and stainless range (WCB, LCB/LCC, WC6/WC9, C5, C12, C12A, CF8/CF8M/CF3/CF3M, CN7M) with API 600 trims 1–13 for sour, low-temperature and high-temperature duties.
Stellite-Hardfaced, Renewable Seats
Renewable seal-welded seats with Stellite 6 hardfacing are standard, delivering long service life in severe service and easier refurbishment during overhauls.
Blowout-Proof Stem & Backseat
Tapered backseat and blowout-proof stem design allow safe packing maintenance in the fully open position and protect against stem ejection.
Serviceability & Interchangeability
Standardized parts, interchangeable wedges in key sizes, and welded or screwed-in seats simplify maintenance and reduce lifecycle cost for operators and EPCs.
Technical Specifications
Size Range
2"–88" (DN50–DN2200) following API 600 standards
Pressure Rating
ASME Class 150–4500 (PN10–PN760)
Temperature Range
-196°C to 650°C (-320°F to 1202°F) for Cryogenic to High-Temperature service
Body Materials
WCB, LCB, LCC, WC6, WC9, C5, C12, C12A, CF8, CF8M, CF3, CF3M, CN7M, Hastelloy, Monel
Special Features
Flexible wedge, OS&Y construction, integral body guides, pressure-seal bonnet options, and Stellite hardfacing for high-cycle isolation.
End Connections
Raised Face (RF) and Ring-Type Joint (RTJ) flanges per ASME B16.5; Butt-weld (BW) ends per ASME B16.25.
Design Codes
API 600, API 603, API 6D, ASME B16.34; Face-to-Face ASME B16.10; Shell and seat testing per API 598.
Applications
Positive isolation in refinery fractionation units, chemical processing reactors, thermal power steam lines, and midstream/downstream oil pipelines.
Industrial Applications & Services
Refining & Petrochemical Units
Main isolation for crude, vacuum, hydroprocessing and clean-fuel units where high temperature and pressure integrity are critical.
Chemical & Coal Chemical Plants
Handles aggressive media and high-temperature services in chemical and coal chemical plants with carbon steel, alloy and stainless body options.
Oil & Gas Pipeline Transmission
Line block valves for onshore and midstream pipelines, compatible with high pressure classes and severe operating cycles.
Power Generation & High-Pressure Steam
Alloy steel and C12A pressure-seal designs for high-temperature, high-pressure steam lines in fossil and combined-cycle power plants.