Full-bore, low-resistance isolation valve engineered for demanding oil, gas, and power service — the benchmark of process plant design.
The cast steel bolted bonnet gate valve is the workhorse of process plant isolation. VALVAX manufactures OS&Y (outside screw and yoke) rising stem and non-rising stem configurations to API 600 and BS 1414, with wedge gate or parallel slide disc arrangements. The through-conduit full bore design provides zero pressure drop in the fully open position, essential for pig-passing and metering applications.
Bolted bonnets permit field repacking without removing the valve from service. Available with hand-wheel, bevel gear, or actuator operation, and with extended glands for fugitive emission service to ISO 15848. All body castings are radiographed and hydrostatically tested before assembly.
| Parameter | Value |
|---|---|
| Design Standard | API 600 / BS 1414 |
| Size Range | 2″ – 24″ (DN50 – DN600) |
| Pressure Class | ASME Class 150 – 900 |
| Face to Face | ASME B16.10 |
| End Connections | RF / RTJ / BW |
| Body Material | WCB / LCC / CF8M / WC6 / WC9 |
| Gate / Stem | SS316 / CF8M / 13% Cr / Duplex |
| Seat Rings | SS316 / Hard-faced (Stellite 6) |
| Design Temp. | -196°C to +593°C |
| Testing | API 598 |
ASTM A216 WCB
The standard for oil & gas and water service. Available with NACE MR0175 compliant hard-faced seats for sour service.
ASTM A217 WC6 / WC9
High-temperature power generation, hot oil, and high-pressure steam service up to 593°C.
ASTM A351 CF8M
Corrosive process streams, marine service, and cryogenic LNG duty with extended bonnet option.
ASTM A352 LCC
Cold climate and cryogenic applications where LCC material's impact toughness is specified.
Refinery block valves, pipeline isolation, and wellsite ESD valves across the full pressure spectrum.
Steam turbine main inlet, boiler feed, and extraction steam isolation in IBR-compliant service.
Process unit battery limit isolation and block valves in refinery, ethylene, and aromatics plants.
Large municipal water main isolation, dam sluice gates, and treatment plant process isolation.
Sea chest, ballast, and bilge isolation on vessels in naval bronze or duplex for seawater service.
Tell us your pipe class, fluid, temperature, and application — our engineers will size and specify the optimal valve.