SER400 – O-Port Thru Gate Valve

Heavy Slurry and Scaling Applications

Features and Benefits


  • NPV O-Port design is generally used in heavy slurry and scaling applications
  • Special Electro Polished gate with machine beveled edge is standard in severe services such as phosphoric acid, green liquor and white liquor applications
  • Precision machining of body halves and close tolerances to gate eliminates solids build up between components ensuring proper cycling
  • Elastomer seated design eliminates pressure on packing in fully open and fully closed positions extending packing life
  • Equipped with hardened gate and cartridge seats, O-Port can be used in large scavenger applications for recycle pulper applications
  • Positive shutoff bidirectional valve in heavy stock applications eliminates dewatering
  • All components – stanchions, bolting, bridge, stem, packing follower – of stainless steel construction which eliminates external corrosion
  • Stainless Steel lockout bar on every valve for quick and efficient lockout
  • Due to torque requirements of O-Port design, use of gear operator or NPV pneumatic cylinder is recommended above 12″
  • NPV O-Port available in sizes 3″ – 30″

Typical applications include:

  1. High density pulp stock isolation
  2. Black liquor and pulp stock
  3. Concentrated black liquor, solids up to 85%
  4. For severe scaling applications: Phosphoric acid, green liquor and white liquor