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Isogate® Valves

The Isogate® WS series wafer style slurry knife gate valve incorporates Linatex® elastomer technology to provide reliable service in tough abrasive and corrosive slurry applications. The Isogate® WS series’ unique design provides reliable service together with ease of maintenance and cost effectiveness in a light weight, compact package. Using materials proven by Weir Minerals Linatex’s experience in abrasion and corrosion resistance, the Isogate® WS series wafer style slurry knife gate valve combines a low maintenance design with a wide range of available materials, making the valve suitable for a variety of applications.

Key features/benefits

  • Unibody design and rugged heavy duty construction ensures long valve life and greater reliability 
  • Flexible two-piece sleeve system allows valve to cycle in heavy slurries without sticking
  • Sleeves are easily replaced without disassembling the valve
  • Replaceable upper seal design is not only packingless, which eliminates the need for periodic adjustment, it is also a self-lubricating system and is rechargeable without valve disassembly (sizes 2” through 16”)
  • Full port design reduces pressure drop and turbulence
  • Open bottom allows for the purging of large solids and solids in high concentration
  • Bi-directional shutoff
  • Wafer style saves pipeline space
  • Sleeves are available in a variety of materials to handle abrasion and chemical applications
  • Flushing plate option allows for periodic cleaning of the lower discharge vent and allows flushing as needed
  • Enclosed bronze bushing with a protected grease chamber means less operating force after long dormant periods
  • Upper stem protector and optional protective lower stem cover prevent external contamination


  • On/Off Isolation of low pressure slurries to 10 bar
  • Cyclone Feed
  • Thickener Underflow
  • Flotation
  • Tailings
  • FGD


  • Integrated slurry pipeline systems