Bi-Directional Knife Gate Valve

The HP series knife gate is a bi-directional high performance valve specially designed to withstand high pressures (PN10, PN16, PN25, PN40, PN64, PN100, PN160, PN250). Resilient seated valve suitable to handle semi-solids, raw sewage, mud, dehydrated sludge and general industrial applications.

General Features

  • 100% tight in both directions
  • Two split body arrangements
  • U-seat with a steel stiff core vulcanized, fixed between the two bodies by screws.
  • Adjustable external stuffing box, allowing upper sealing replacement without valve disassembling from the pipeline
  • Short face-to-face dimension
  • Smooth and unobstructed full flow passage, no cavity or void in body, means no clogging
  • Easy drive replacement
  • Self cleaning design; little maintenance required
  • Proximity and limit switch mounting points

Technical Data

Size range:

  • DN-50 (2”) to DN-1800 (72”)

Working pressure:

  • DN 350 to DN 600: 10 kg/cm2
  • DN 50 to DN600: 16 kg/cm2
  • DN 50 to DN600: 25 kg/cm2
  • DN 50 to DN600: 40 kg/cm2
  • (For higher pressure, please ask factory)

Flange ratings:

  • PN10, PN16, PN25, PN40, PN64, PN100, PN160, PN250 and ANSI B16.5
  • (Other flange drillings under request)


  • RAL 5017, 150 microns epoxy coated


  • Pressure equipment directive 97/23/CE
  • DIR 2006/42/CE (MACHINES)
  • DIR 94/9/CE (ATEX)
  • Approved certificate for potable water

Application Fields

  • Wastewater treatment
  • Dehydrated sludge
  • Power plants
  • Mining
  • Oil rigs
  • Tunnel boring
  • Etc

Expert technical

Contact us for expert technical advice with applications, grade selection and product working pressures.

Wide range of

DH Stainless stock the widest range of stainless steel piping and tubular products.

Three stock

DH Stainless have our main distribution stock hub at our head office in North West England as well as stock branches in Scotland and South East England.