WKM Pow-R-Seal
Expanding Gate

Stock available today in 2″ – 36″, ANSI 150# – 900# 
Carrying T101 & T24 models with Low Alloy
& T24 Stainless Steel

The WKM Pow-R-Seal Expanding Gate Valve is engineered for dependable sealing
performance in demanding oil, gas, and industrial flow control applications. Energy
Products maintains inventory of WKM Pow-R-Seal expanding gate valves in sizes ranging from 2″ to 36″ with ANSI pressure classes from 150# to 900#, allowing for
fast delivery when reliability and performance matter most.

We carry T101 and T24 models, including configurations in low alloy steel and T24 stainless steel, providing durability and corrosion resistance for a wide range of operating environments. Known for its through-conduit design and positive mechanical sealing, the WKM Pow-R-Seal Expanding Gate Valve delivers dependable shutoff and
long service life in critical pipeline and processing systems.

Through-Conduit Parallel Expanding Gate Valve
• Provides a tight mechanical seal
• Full-bore design reduces pressure drop and allows passage of all types of scrapers (pigs)
• Nickel-plated gate and segment standard

Fugitive Emissions-Tested SLS Stem Seal
• Stem seal is completely contained in the bonnet
• Stem is centralized by bearings
• Nickel-plated stem standard
• Seal is self-adjusting and does not depend on plastic packing
• PTFE compound resists virtually all ladings Pedestal supports the seal and acts as a stem scraper
• 6” to 24” (150 mm to 600 mm) Class 300 to 900 valves are fire-tested to API 6FA 3rd Edition

Manuals

WKM Pow-R-Seal Catalog

WKM Pow-R-Seal Operations & Maintenance

WKM™ Pow-R-Seal™ Double Expanding Gate Valve

Trusted Expanding Gate Valve for Critical Pipeline Service

With more than 60 years of proven worldwide service, the WKM Pow-R-Seal expanding gate valve has established itself as one of the most trusted double expanding gate valve designs for oil, gas, chemical, water, slurry, and multiproduct applications. It is widely specified where safety, zero leakage, and long-term seal reliability are critical.

The positive mechanical seating force of the lock-in-place seals maintains tight shutoff through vibration and pressure and temperature changes. A rigid cast steel body resists pipeline bending moments, helping preserve sealing integrity in demanding pipeline environments.

PTFE seals on both faces of the valve provide drop-tight sealing even at low differential pressure, while metal-to-metal contact between the seats and gate mechanism ensures fire-safe shutoff. Optional all-metal sealing configurations are available for service temperatures up to 1,000°F (538°C), with leakage rates compliant with API Spec 6D.

The Pow-R-Seal gate valve is a preferred solution for pipeline operators transporting liquids, as it tolerates wax, paraffin, abrasives, and multiproduct flow that can cause sealing issues or premature wear in other gate valve designs.

Applications for Double Expanding Gate Valves

The WKM Pow-R-Seal double expanding gate valve is engineered for a wide range of critical and severe-service applications, including critical pressure barriers, pump and compressor isolation valves, launcher and receiver valves, and master valves on storage wells. It is commonly used in industrial steam and geothermal service, dirty service environments, and decoking systems. The valve is also increasingly specified for CCUS, renewable fuels, and ammonia service where dependable isolation and seal reliability are essential.

Benefits of the WKM Pow-R-Seal Expanding Gate Valve

Designed for reliable performance and long service life, the Pow-R-Seal expanding gate valve provides protection of seat faces and a smooth, continuous conduit for flow. Its tight mechanical seal delivers true double block-and-bleed capability while allowing for inline field repairs that reduce downtime. Fire-safe certification to API Spec 6FA and ISO 10497, along with fugitive emissions certification to ISO 15848-1, supports use in regulated and safety-critical pipeline systems. The design is well suited for corrosive, erosive, and aggressive pipeline service.

Design Features of This Expanding Gate Valve

The stem seal uses a single SLS™ spring-loaded lip seal that has been fugitive-emissions and fire tested, reducing maintenance requirements and eliminating the need for plastic packing. An external differential thermal relief system protects against excess body pressure. Seat and stem injection ports allow lubricant or emergency sealant to reduce operating torque, extend valve life, and provide emergency sealing capability. Flexible installation orientation allows the valve to be installed in a wide range of pipeline configurations.

Frequently Asked Questions

How does a double expanding gate valve work?

The Pow-R-Seal expanding gate valve uses a two-piece gate and segment assembly.
In the fully closed position, the segment engages an end stop and the gate wedges
downward, expanding the assembly to create a tight mechanical seal against both
upstream and downstream seats.

What happens during opening and closing?

During opening, the gate slides across the wedge angle of the segment, collapsing the
assembly so it can travel freely between the seal faces. A lever-lock gate centralizer
holds the mechanism in a neutral position until seal expansion is required.

How is flow isolated in service?

When the segment bore aligns with the conduit bore, an end stop prevents further travel
and the gate slides across the wedge angle, expanding the gate and segment to isolate
flow from the valve body. A preferred flow direction helps ensure smoother operation
and reduced operating torque.