WCB Gate Valve: Reliable Isolation for Industrial Flow Control

Product Specifications

• Product Name: WCB Gate Valve

• Model/Series: WCB Series

• Size Range: DN50 ~ DN600 / NPS 2″ ~ 24″

• Pressure Rating: PN40 / Class 300 (Higher ratings available up to Class 2500)

• Connection Type: Flanged (ASME B16.5), Butt-weld, Socket-weld

• Design Standard: API 600, ASME B16.34

• Body Material: ASTM A216 WCB (Carbon Steel)

• Gate/Disc Material: ASTM A216 WCB + Stellite Gr.6 overlay -3

• Seat Material: Integral seats with Stellite Gr.6 overlay -1-3

• Stem Material: ASTM A182 F6a (13% Chrome Stainless Steel) -3

• Operation: Handwheel (standard), Bevel Gear, Electric, Pneumatic -1-2-4

• Special Design: Rising stem, Bolted bonnet, Flexible wedge, Backseat design, API 598 testing -3

• Working Temperature/Media: -29°C to 425°C, suitable for water, steam, oil, and non-corrosive hydrocarbons -3-4

When Isolation Must Be Absolute

In industrial piping systems, the difference between controlled operations and unplanned shutdowns often comes down to one thing: reliable isolation. For engineers and plant managers responsible for steam systems, hydrocarbon processing, or high-pressure water lines, a gate valve must deliver a positive shut-off every time—without exception.

The WCB Gate Valve is engineered specifically for this purpose. Constructed from ASTM A216 Grade WCB carbon steel, it provides the mechanical strength and thermal stability required for demanding industrial environments where failure is not an option.

Designed for Positive Shut-Off

Material Integrity That Delivers

The foundation of this valve’s reliability lies in its materials. The WCB carbon steel body offers an optimal balance of tensile strength, impact resistance, and weldability—making it the preferred choice for carbon steel valves in moderate to high-temperature services up to 425°C (800°F) -3-4.

But material selection extends beyond the body. The gate and seat rings feature Stellite Gr.6 overlay—a cobalt-based alloy that maintains hardness at elevated temperatures and resists galling, erosion, and wire drawing -1-3. This ensures the valve maintains its sealing integrity cycle after cycle, even in steam service or throttling-prone applications.

The stem, machined from ASTM A182 F6a stainless steel, combines high tensile strength with corrosion resistance. Its fine-finished surface interacts with the adjustable graphite packing to provide a reliable stem seal that minimizes fugitive emissions and maintenance intervals -3.

Engineering That Performs

Designed and manufactured in accordance with API 600 and ASME B16.34, this gate valve incorporates several critical design features:

• Flexible Wedge Design: Accommodates thermal expansion and contraction without binding, ensuring consistent sealing across the full temperature range

• Integral Backseat: Allows repacking under pressure when the valve is fully open, enhancing operational safety

• Bolted Bonnet: Provides easy access for inspection and maintenance while maintaining pressure integrity

• Full Bore Design: When fully open, the valve presents no obstruction to flow, resulting in virtually zero pressure drop -7

Available in sizes from DN50 to DN600 (NPS 2″ to 24″) with pressure ratings up to Class 300 (PN40) —and higher ratings available upon request—this valve integrates seamlessly into existing ANSI or DIN standard piping systems -3-4.

Where This Valve Proves Its Value

Steam Systems

In saturated and superheated steam applications up to 425°C, the WCB gate valve with Stellite-faced seats provides dependable isolation, protecting downstream equipment during maintenance and ensuring operator safety -1-3.

Oil & Gas Facilities

From crude oil handling to natural gas transmission, this valve delivers bubble-tight shut-off when closed and unrestricted flow when open—critical for separator isolation and compressor station block valves -4-7.

Refineries & Petrochemical Plants

Suitable for fuel oils, intermediate hydrocarbons, and non-corrosive process fluids, the valve’s carbon steel construction and stainless steel trim provide the corrosion resistance required for reliable long-term service -3-4.

Power Generation

Installed on boiler feedwater lines, blowdown systems, and condensate return piping, these valves withstand the thermal cycling and pressure fluctuations common in power plant environments -1.

Maintenance That Won’t Shut You Down

We understand that every hour of unplanned downtime carries a significant cost. The WCB Gate Valve is designed with this reality in mind.

The bolted bonnet configuration allows maintenance crews to access internal components without removing the valve from the pipeline—a critical advantage during tight turnaround windows. The graphite packing with stainless steel anti-extrusion rings provides reliable stem sealing while remaining adjustable in service -1-3.

For larger sizes (typically DN300 and above), the valve can be equipped with a bevel gear operator, reducing manual effort and ensuring smooth, controlled operation. Where automation is required, electric or pneumatic actuators can be mounted to the standard ISO top flange, enabling remote operation and integration with plant control systems -1-2-4.

Every valve undergoes rigorous testing in accordance with API 598, including shell tests and seat leakage tests, before leaving our facility. This commitment to quality assurance means you install a valve that’s been proven tight—not one you hope will be.

The Bottom Line on Reliability

For the project engineer or procurement specialist, selecting a gate valve is a decision about operational continuity. The WCB Gate Valve represents a commitment to positive isolation, thermal stability, and long-term service life.

By combining the proven metallurgy of ASTM A216 WCB with hard-faced seating surfaces and stringent API 600 design standards, we deliver a solution that doesn’t just meet specifications—it performs when it matters.

Contact our engineering team today to discuss your specific line sizes, pressure requirements, or to request material certification packages.