The basic Fabri-Valve C45 features a solid ductile iron or carbon steel body with an integral cast metal seat. However, this valve is most often used with the patented, pop-in style replaceable seats, which are available in a variety of rubbers, polyurethane, UHMW-P, TFE, and hard-faced metal. The pop-in seats feature a much larger cross section and seating area than conventional knife gate valve seats thus providing a seating surface far removed from the flow stream. Replaceable seats offer a unique advantage; abrasion resistance, long seat life, and the convenience of easy seat replacement.
All Figure C45 knife gate valves with handwheels include a provision for a locking device.
CAUTION: (Replaceable soft seats) Review Fabri-Valve gasket/mating flange recommendations.
Unit of Measure


N/A Size Range
2" – 24"
Pressure Rating
150 psi (10.3 bar) CWP (cold working pressure)
Temperature Rating
Service temperatures above 400°F (204°C) require high temperature fasteners. Specify service temperature.
Flange Drilling
Flat faced ANSI 125/150


N/A Every Fabri-Valve C45 valve is fully tested prior to shipment.
Testing includes a body shell test, a seat test, and a cycling test to insure proper functioning of moving parts. Additional testing is also available. Please let us know your requirements.
Standard Shell test:

  • Hydro test at 1.5 times the rated CWP (cold working pressure) – Zero allowable leakage
    Standard Seat test:
  • Metal Seat: Hydro test at 40 psi (2.8 bar) and at the rated CWP
  • Resilient Seat: Hydro test at 15 psi (1 bar) and rated CWP

  • Pressure/Temperature Ratings

    N/A The table listed in 'more images' is the Maximum Pressure /Temperature Ratings for the metallic components only. When checking pressure/temperature ratings, check the temperature rating and chemical compatibility of the packing material and, if applicable, the resilient seat material. In a majority of knife gate valve designs, the temperature limit or the chemical compatibility of the seat and/or packing material determines the practical pressure/temperature limitations.

    Shutoff Performance

    N/A Metal Seat

  • Single integral metal seat
    2" – 24" 40cc / minute / inch of valve size
  • Single hardfaced replaceable metal seat
    2" – 24" 80cc / minute / inch of valve size
  • Dual hardfaced replaceable metal seats
    Consult factory. All sizes. Resilient Seat
  • Single “D”ring, or single replaceable resilient seat (excluding PTFE)
    Zero leakage. All sizes.
  • Dual seats
    Consult factory. All sizes.
  • Single replaceable PTFE seat
    Consult factory. All sizes.

  • Low Pressure Operation

    N/A Metal seated knife gate valves are seat tested at 40 psid (2.8 bar) in the preferred flow direction. When pressure falls below the 40 psid (2.8 bar) test pressure, less force is pushing the gate into the seat, which may result in additional seat leakage. When improved low-pressure shutoff performance is required, optional chest buttons should be specified

    Flow Coefficients

    N/A The Cv values in 'more images' represent U.S. gallons per minute 60°F water through a 100% open valve at a pressure drop of 1 psi. The metric equivalent, Kv, is the flow of water at 16°C through the valve in cubic meters per hour at a pressure drop of 1 kg/cm2. To convert Cv to Kv, multiply the Cv by 0.8569.

    Available Options


  • "D" Ring Seat
  • Lever Operator
  • Dual Seats
  • Poly Replaceable Seats
  • UHMW Replaceable Seats
  • PTFE Replaceable Seats
  • Rubber Replaceable Seats
  • Hard Faced Gate Edge
  • Hard Gate Material
  • Nickel-TFE Coated Gate
  • Epoxy Coating
  • Thru Drilled Flanges
  • Flush Ports
  • Chest Buttons:
    Not available 2" – 6"
  • Cast Ni-Hard Deflection
    Cones: Available sizes 3" – 16"
  • Fabricated Deflection Cones
  • Locking Devices
  • E-Z Spin Handwheel
  • Live Loaded Packing
  • Self-Supporting Yokes
  • Bevel Gear
  • Chainwheels
  • Cylinder Actuators
  • Electric Actuators
  • Ratchet
  • Extended Stems
  • Rod Boots