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Las válvulas de mariposa son válvulas de un cuarto de vuelta con características de flujo de tipo porcentual iguales. Proporcionan un control de flujo moderado y, por lo tanto, se pueden utilizar tanto para el servicio de activación / desactivación como para el de modulación. Buena tolerancia a los sólidos en suspensión, pero no se recomienda su uso con lodos o residuos. La válvula de mariposa es adecuada para una amplia variedad de aplicaciones de flujo de fluidos.

Type-57 LIS Butterfly valves are quarter turn plastic valves with equal percentage type flow characteristics. They provide moderate flow control and therefore can be used for both on/off and modulating service. Good tolerance to suspended solids but not recommended for use with slurries or debris. The Type-57 LIS butterfly valve is well suited for a wide variety of fluid flow applications. The Type-57 LIS butterfly valve conforms to ISO 5752 Short Pattern face to face dimensions. This allows the Type-57 LIS to directly replace metal valves conforming to the same standard. Available as ANSI B16.5 Wafer or ANSI B16.5 Lug models with 316SS drop-in lug inserts. Can be pneumatically or electrically actuated.

Ideal Applications Include: 

Isolation Valves, Water Treatment, Water Features, Fountains, Aquariums, Landfills, Swimming Pools, Power Plants, Mining, Transportation


  • • Direct Replacement for metal valves conforming to ISO-5752 Short Face to Face dimensions.
    • Standard model has PVC body with PP disc for superior chemical and corrosion resistance as well as elevated temperature capabilities.
  • • Non-wetted 316 SS stem has full engagement over the entire length of the disc and is totally isolated from the media.
  • • Full seat design isolates the body and stem from the media and acts as mating flange gaskets
  • • Integral body stops in valve body to prevent overtightening of mating flanges
  • • Spherical disc design for improved CV’s and superior durability
  • • Integral locking lever handle w/21 position throttling plate
  • • Plasgear™ operator – Industry first composite enclosure gear-operator
  • • Integral ISO-5211 top mounting pad for actuation mounting
  • • Polypropylene stem retainer to prevent stem



Lever: 3" – 8"
Gear: 3" – 8"




EPDM, FKM, or Nitrile


Same as seating material


Wafer Style or Lug Style with 316SS lug inserts


Lever and Plasgear




316 stainless steel, Titanium, Hastelloy C® ‡


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