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We Make Valve Automation Easy
We Make Valve Automation Easy

FK Series Polypropylene Butterfly Valves

Wafer Style 1 1/2" to 12"; Lugged Style 2 1/2" to 12"
Manual and Actuated Polypropylene Butterfly Valves



The FK Series Polypropylene Butterfly Valves incorporate many features of our industrial FK valve, yet the all Polypropylene construction and EPDM liner make this valve the perfect choice for water and light industrial applications. The special trapezoid shape of the liner and serrated body cavity guarantee a bubble tight seal while keeping break-away torque at an absolute minimum. This versatile valve features double self-lubricating seals, direct actuator mount capability, or the option of either a lever handle or gear box.


Wafer & Lug Style Mounting

Polypropylene Butterfly Valve Wafer Mounting

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
  • NSF / ANSI 61 Certified for potable water


  • Body: GRPP (Glass Reinforced Polypropylene)
  • Disc: CPVC
  • Seats & Seals: EPDM or Viton®
End Connections
  • ANSI 150 Wafer: 1 1/2" to 12"
  • ANSI 150 Lugged: 2 1/2" to 12"
Temperature Range:
  • 32°F to 212°F
  • see P/T curve
Pressure Range: (at 73°)
  • 150 PSIG (1 1/2" to 10")
  • 120 PSIG (12")
  • see P/T curve

Available Actuators

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

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
  • Custom Butterfly Valve Assemblies


  • ASTM D1784
  • ANSI B16.5

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