FK Series Polypropylene Butterfly Valves

Stainless Steel,2-way,Full Port,Ball Valve,26 Series,Assured AutomationThe FK Series Polypropylene Butterfly Valves offer superior strength and chemical resistance in highly corrosive environments and process flow conditions. The special trapezoid shape of the liner and a serrated body cavity guarantee a bubble tight seal while keeping break torque at an absolute minimum. This versatile industrial valve features double self-lubricating seals, direct actuator mount capability, or the option of a lever handle or gear box. A stainless steel "insert" lug version provides full bi-directional operation allowing disassembly of the downstream flange connection without the integrity of the upstream line.

Features & Benefits

  • Standard ISO square dimensions for direct mounting of actuators.
  • The disc/seat features a trapezoidal elastomeric liner to provide a bubble tight seal.
  • The liner completely isolates the valve body from the process flow.
  • The liner functions as a flange gasket on both sides of the valve.
  • The body cavity features special channeling to prevent liner slippage and compression.
  • PTFE seated o-ring shaft seals.


  • Seats and Seals - EPDM or Viton®
  • Disc - PP (polypropylene)
  • Body - GRPP (glass reinforced polypropylene)

Available Actutors

  • Electric
  • Pneumatic (spring return)
  • Pneumatic (double acting)
  • Manual Handle Lever
  • Manual Gearbox with Hand Wheel


  • Temperature Range:
    32°F to 212°F
  • Max. Pressure: (at 73°F)
    1 1/2" - 10" - 150psi
    12" - 120psi

End Connection

  • 1 1/2" to 12" Wafer Flange (ANSI 150)
  • 2 1/2" to 12" Lugged Flange (ANSI 150)

FK Series Butterfly Valve Installation

  • Wafer Butterfly Valves
    install between flanges and bolts span the body.
  • Lug Butterfly Valves
    install between flanges and bolts are threaded into tapped holes from each side of mounting flange.

Typical Applications

  • Industrial process piping systems
  • Double containment systems
  • Acid waste systems and wastewater
  • High purity systems
  • Municipal pressure and gravity piping systems
  • Plumbing and mechanical pipe systems
  • Electrical systems
  • Irrigation systems
  • Radiant heating systems

Data Sheet

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Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


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