60 years of worldwide service in oil, gas, chemicals, water, slurry, and multiproduct applications has established the WKM Pow-R-Seal expanding gate valve as one of the most trusted gate valves, especially where safety and seal reliability are critical.

The positive, mechanical seating force of the lock-in-place seals holds with zero leakage through conditions of vibration, pressure change, and temperature excursion. The rigid, cast steel body resists pipeline bending moments.

TFE seals on both faces of the valve provide drop-tight sealing even at low differential pressure, while metal-to-metal contact between the seals and gate mechanism provides fire-safe shutoff. Optional all-metal seals also are available for service up to 1000º F (538º C), where leakage rates comply with API 6D, Supplement 2.

Our WKM Pow-R-Seal gate valve is the choice of liquid pipeline operators because it tolerates the wax, paraffin, abrasives, and multiproduct flow that causes problems in other valve designs.


The WKM Pow-R-Seal gate valve provides these specific advantages resulting in reliable performance and long life:
  • Protection of seat faces
  • Smooth, continuous conduit for flow
  • Tight mechanical seal and double block-and-bleed capability
  • Fugitive emissions-tested SLS stem seal
  • In-line, field repairable
  • Certified fire-safe to API 6FA, Bs6755, and ISO 10497
  • Selected for corrosive, erosive, and aggressive pipeline service