header valves
Valves & Actuation

Manual Plastic Butterfly Valves

Type-55 IS Butterfly Valve (2"- 16")

Type-55 IS butterfly valves are quarter-turn metal body valves with equal percentage type flow characteristics. They provide moderate flow control and, therefore, can be used for both ON/OFF and modulating service. The Type-55 IS butterfly valve features an epoxy powder-coated ductile cast iron body with PTFE disc and Liner. The Type-55 IS is designed for use in applications where conventional rubber liners and thermoplastic discs would fail. Can be pneumatically or electrically actuated.


Data Sheet


Ideal Applications Include:

Isolation valves, control valves, chemical processing, mining


Lever: 2" - 5"

Gear: 2" - 16"

Body Materials:

Powder-coated finish ductile cast iron

Seat Materials:

PTFE backed with neoprene

Disc Materials:



  • Face-to-face dimension conforms to ISO 5752 short pattern for metal valves
  • Powder-coated cast ductile iron body for corrosion resistance
  • Highly corrosion resistant PTFE disc and PTFE seat are the only parts in contact with the process media
  • Stainless steel stem is non-wetted, isolated from the media, and has full engagement thru the entire length of the valve body and disc
  • High Cv value achieved with strong, thin disc
  • Class 6 bubble tight shut-off
  • Lever handle features 19 position throttling plate and factory padlock provision
  • Plasgear™ engineered resin enclosure gear-operator with stainless steel trim
  • Top flange conforms to ISO 5211 for actuation mounting


  • Pneumatic or electric actuation with accessories
  • 2” square nut on valve stem or Plasgear™ operator handwheel shaft
  • Stem extensions
  • Chain operators (Plasgear™ type only)
  • Manual limit switch (lever or Plasgear™ types)
  • Speed Handle™ for Plasgear™ operator