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Keystone Figure PCS17 Perimeter seal
Bi-directional zero leakage knife gate valve.
The new standard for innovation and performance with its drop-in new generation perimeter seat, that ensures zero leakage in either direction
Keystone Figure PCS17 Perimeter seal


End Connection
Flangeless, Lugged
Carbon Steel, 316 Stainless Steel
Operating Temperature
Less Than 400 F (204 C)
Process Connection Type
Seat/Seal Type
Shutoff Class
Zero Leakage
Valve Type
Water, Other, Liquids, Liquid, Aggressive Liquids/Gases
Adjustable packing


  • Unique drop-in next-generation perimeter cartridge seats ensure zero leakage and quick and cost-effective maintenance resulting in lower cost of ownership.
  • Re-engineered seat geometry and a new precision moulding process ensure zero water leakage at low or high pressures.
  • Seat material is available a variety of materials including EPDM, Viton (FKM), Nitrile (NBR).
  • The seat is in-line replaceable.
  • Solid cast, one piece body in 316 stainless steel or WCB cast carbon steel. Designed and qualified through FEA analysis for optimum performance and reliability.
  • Four post yoke design makes it easier to make packing adjustments and is more efficient for seat repair/replacement. Also makes actuator retro-fitting quick and easy.
  • Built to industry standards including; MSS SP-81 face to face and full port design to Schedule 40.


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