Expanded Gate Valve

Designed for critical isolation in high-pressure pipeline and process systems, the Expanded Gate Valve provides dependable shut-off while maintaining a secure seal even under demanding operating conditions. Its expanding gate mechanism uses mechanical expansion between the gate and seats to establish firm metal-to-metal contact, providing effective isolation in both flow directions. The design is particularly advantageous for applications requiring cavity relief, reduced seat wear, and reliable sealing over extended service periods.

The Expanded Gate Valve is well suited for oil & gas, natural gas transmission, petrochemical, refinery, chemical processing, and other critical pipeline applications. Its full-bore flow passage, bidirectional sealing capability, and mechanically energized seating system make it an effective solution for pipeline isolation, pigging systems, and services where reliable line separation is essential.

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Technical Specifications

Product description:	Expanded Gate Valve
Model:	544WF/Y-Expanded Gate Valve
Nominal diameter:	NPS 2”～30”
Operating temperature:	-196℃～593℃(the range of service temperature may vary for different materials)
Nominal pressure:	CLASS 150～2500
Material:	Main material: A216 WCB、WCC; A217 WC6、WC9、C5、C12、C12A、CA15; A351 CF8、CF8M、CF3、CF3M、CF8C、CN3MN、CK3MCUN、CN7M; A352 LCB、LCC; A494 CW-6MC、CU5MCuC、M35-1; A890 4A(CD3MN)、5A(CE3MN)、6A(CD3MWCuN); ASME B 148 C95800、C95500, etc.
Design standard:	API 600、ASME B16.34、GB/T 12234、GB/T 12224
Structural length:	ASME B16.10、GB/T 12221
Connecting end:	ASME B16.5、ASME B16.47、ASME B16.25、GB/T 9113、GB/T 12224
Test standard:	API 598、ISO 5208、GB/T 26480、GB/T 13927
Operation method:	non-elevating hand wheel, bevel gear, motor drive unit, pneumatic drive unit
Application fields:	For application in fields such as electric power industry, tap water engineering in urban construction, chemical engineering, etc.

Features & Benefits

Heavy-duty isolation valve providing full-bore flow with minimal pressure loss.

Expanding Gate Mechanism

Mechanical expansion forces the gate segments against the seats, creating firm contact and dependable isolation.

Bidirectional Sealing

The expanding gate arrangement provides effective shut-off from both upstream and downstream directions.

Full-Bore Passage

When fully open, the gate retracts from the flow path to provide a substantially unobstructed passage with minimal pressure loss.

Positive Mechanical Sealing

Seat contact is generated mechanically rather than relying solely on line pressure, supporting consistent sealing performance.

Cavity Pressure Management

The design can provide effective control of pressure trapped within the valve body cavity, depending on the specific configuration.

Suitable for Pigging Operations

Full-port construction allows pipeline pigs and inspection tools to pass through the valve in suitable pipeline applications.

Reduced Seat Wear

The gate and seats can be designed to minimize unnecessary rubbing during opening and closing, helping preserve sealing surfaces.

Robust Pipeline Isolation

Strong pressure-containing components are suited to demanding transmission and process pipeline services.

Low Flow Resistance

The unobstructed bore supports efficient transport of liquids and gases with limited pressure drop.

Wide Application Range

Suitable for natural gas transmission, oil pipelines, gathering systems, refineries, petrochemical plants, and other critical isolation services

Application Scenario

Chemical Industry

Ball valves, butterfly valves, gate valves, globe valves, check valves, and control valves ensure safe fluid isolation, precise process control, and reliable operation in demanding chemical processing applications.

Oil Industry

Engineered for reliable isolation, flow regulation, and backflow prevention, our valve solutions support upstream, midstream, and downstream oil production and refining operations.

Natural Gas

Providing leak-tight sealing, dependable flow control, and safe pipeline operation for natural gas transmission, storage, LNG, and distribution systems.

Metallurgy

Built to withstand high temperatures, abrasive media, and harsh operating conditions in steelmaking, smelting, and metallurgical processing.

Power Generation

Ensuring reliable isolation, accurate flow control, and long-term performance in steam, boiler, turbine, and power plant systems.

Pharmaceutical

Delivering hygienic, precise, and contamination-free flow control for pharmaceutical manufacturing and clean process applications.

Steel Industry

Designed for high-temperature, high-pressure, and severe-service conditions in iron making, steelmaking, rolling mills, and auxiliary process systems.

New Energy

Supporting hydrogen, LNG, carbon capture, battery materials, and renewable energy projects with advanced valve solutions for safe and efficient process control.