Large Caliber Gate Valves

For critical pipeline isolation in oil and gas transmission, refinery processing, water distribution, and steam generation, Large‑bore Gate Valves deliver dependable bidirectional shutoff with a full-port design that eliminates flow restriction and allows inline pigging. Each valve is manufactured to ASME B16.34, API 600, API 603, and API 6D, with face-to-face dimensions per ASME B16.10 and end flange drilling per ASME B16.5 or ASME B16.47. Standard body materials include A216 WCB carbon steel, A352 LCB low-temperature carbon steel, A351 CF8/CF8M stainless steel, A217 WC6/WC9 chrome-moly for high temperature, duplex stainless steel for chloride service, and Inconel for aggressive chemicals. End connections are available as raised-face flanges, ring-type-joint flanges, butt-weld ends for high-integrity piping, and hub ends for compact valve stations. Operation options range from manual handwheel and bevel gear to electric motor, pneumatic cylinder, and hydraulic drive, supporting valve sizes from 2 inches up to 48 inches and larger on request. Pressure-seal bonnets provide leak-free joints for Class 900 and above, while bolted bonnets cover Class 150 through Class 600. The flexible wedge design compensates for thermal expansion and minor seat misalignment, reducing leakage risk in high-temperature cycles.

Large Caliber Gate Valves are built with a guided wedge that self-aligns with hardfaced seat rings to maintain tight shutoff under frequent operation and abrasive media. The stem features an anti-blowout shoulder, precision acme threads, and a live-loaded packing system that reduces fugitive emissions and extends maintenance intervals. Seating surfaces are hardfaced with Stellite, 13Cr, or tungsten carbide to resist erosion, galling, and wear, while optional soft inserts provide bubble-tight sealing for low-pressure gas or liquid lines. Renewable seat rings allow in-line replacement without removing the valve body, cutting downtime and lifecycle cost. Standard accessories include pressure taps, drain valves, bypass systems, and gear operators with open/close position indicators. Every unit undergoes hydrostatic shell testing at 1.5 times rated pressure and seat testing at 1.1 times rated pressure according to API 598 or API 6D. Fire-safe certification to API 607 or API 6FA is available for hazardous service, and low-emission packing can be tested to ISO 15848-1. Material traceability is documented through heat numbers, and positive material identification is performed on request.

Key Product Features

• Full-bore conduit design reduces pressure drop and allows pipeline pigging.
• Bidirectional metal-to-metal seating with optional soft inserts for zero leakage.
• Anti-blowout stem and live-loaded packing improve safety and reduce fugitive emissions.
• Hardfaced wedge and seat surfaces extend service life under abrasive media.
• Flexible wedge design compensates for thermal expansion and seat misalignment.
• Flanged RF/RTJ, butt-weld, and hub end connections available across all pressure classes.
• Manual, gear, electric, pneumatic, and hydraulic actuation for remote or high-torque operation.
• Fire-safe and low-emission designs certified to API 607, API 6FA, and ISO 15848-1.
• Pressure-seal bonnet for Class 900 and above ensures leak-free joint integrity.
• Renewable seat rings reduce downtime and maintenance cost.
• Standard bypass and drain connections simplify pressure balancing and service.
• Available with position indicators and limit switches for automated control systems.

Technical Parameters

Material Options

Standard Scope of Supply

• Valve body, bonnet, wedge, stem, seat rings, packing, and gasket.
• Handwheel or gear operator as specified.
• Flange protectors and lifting lugs for safe handling.
• Hydrostatic shell and seat test certificates.
• Material traceability and heat number documentation.
• Primer and finish coating per customer specification.