SISTAG knife gate valves for difficult environments and corrosive media.

  • Pressure: PN10-PN100
  • Valves leakge class is A, zero leakage for bi-directional flow
  • Unique WEY sealing system allows bubble-tight shut-off due to the joint action of various factors during the closing stage
  • Manual versions available and with all types of actuators

Special solutions for high fibre concentration mass, dry abrasive medias and thick slurries.

Wey valve types:

For more standard solutions and lower pressures 1-10bar:


  • Cast iron, stainless steel
  • Body semi-lug type, for pipe end service
  • Size: DN50-1400
  • Pressure: PN10-PN6
  • Broad sealing selection
  • Available with quick action lever to lower pressure solutions


  • MF cast iron, MG ductile Iron, stainless steel
  • Monoflange, for pipe end service
  • MF sizes: DN50 1600 mm, MG: DN100-600
  • Pressure MF: PN10, MG: PN16
  • Broad sealing selection
  • Options for dry, abrasive medias


  • MH ductile iron, stainless steel
  • Monoflange / Lug, for pipe end service
  • Double transverse seal with scraper
  • Size: DN 80 400 mm
  • Pressure PN25
  • Gate guided for full length of stroke, with 60° arc geometry which prevents jamming, refer to illustration
  • Flush ports in corners
  • Broad sealing selection
  • Options for special solutions

Also available for ATEX locations and special materials for example duplex, titanium etc. if requested.


  • Bio gas
  • Cement Industry
  • Chemical Industry
  • Coal Fired Power Station
  • Waste Handling
  • Mining Industry
  • Petrochemical Industry
  • Off-shore
  • Slurry
  • Power
  • Pulp & Paper
  • Sand & Gravel
  • Steel
  • Waste Utility

Special versions:

HD: DN50-400 PN100, mining, chemical, oil industry
HSI: DN100-400, PN10-16, explosion protection

Sistag Wey knife gate valves

Contact personnel