The SISTAG WEY knife gate valve, of a unique valve design, assures life-long reliability and bubble-tight shut-off attributed to the joint action of various factors during the closing stage.


  • Tight shut-off by sealing function on the lateral gate side
  • Gate guides on full stroke length
  • Knife-like gate that shears off remaining solids
  • Enlarged flushing corners prevent jamming during closure
  • Transverse seal eliminates stuffing box ensuring no leakage to atmosphere
  • Minimized chest area prevents solid build-up/jamming by tightening packing screws without system shut-down provides cost savings in maintenance.

The Penstocks are designed to DIN 19569-4, with frame to be embedded in concrete channel wall or wall mounting.


  • Welded construction
  • Stainless steel frame
  • Two lipseals arrangement with scraper in front of transverse seal