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Butterfly Valves

Butterfly Valves

BODY :

  • One-piece wafer and lugged body for strength and stability in extreme environments.
  • Wafer bodies have a heavy external rib providing quick and accurate alignment during installation.
  • Heavy-duty top plate is drilled and slotted to ISO 5211 and other existing valve drillings, allowing ease of automation and interchangeability.
  • Standard extended neck provides full clearance for 2” of pipe insulation.
  • Two-part polyester-coated body provides a tough and durable coating against corrosion.

DISC :

  • All 316 stainless steel discs are polished to a mirror finish.
  • The disc has a streamlined design providing higher Cv and lower pressure drop.
  • The disc edge is contoured to give a tighter seal with lower torque.

SHAFT :

  • Oversized shafts allow for greater strength and more stability to the disc.
  • Two self-lubricated bronze bearings are machined to tolerances to the shaft and body, eliminating side loading for the shaft.
  • Blowout-proof design is achieved by utilizing the proper sealing method.

DISC / SHAFT CONNECTION :

  • A high-strength, machined Double “D” connection ensures a positive shaft-to-disc connection.
  • Offset shaft retainers will not permit the shafts from moving up and down, preventing jamming of the disc into the seat.

SHAFT SEALING METHOD :

  • PTFE and elastomer are both vulcanized to a rigid phenolic ring. This cartridge seat provides a stable platform, eliminating movement of the PTFE and elastomer.
  • Torque fluctuation is eliminated because of the consistent conformity of the seat provided for by the cartridge design.
  • Large flange seal area assures no leakage when used with lined or unlined flange mating services.
  • There is no need for gaskets or o-rings.
  • Cartridge design allows for full field replacement.

SEAL / DISC / SHAFT SEALING METHOD :

  • The Flow Line shaft seal is achieved through a continuous pressure exerted from the flatted area of the seat to the machined flatted area of the disc.
  • The raised flatted area of the seat corresponds precisely with the machined flatted hub area of the disc. These matching flatted surfaces provide a wide sealing area for the elastomer-backed PTFE seat to exert pressure against, forming the primary seal.
  • Secondary sealing is provided by a 360° machined radius on the flatted hub.
  • The sealing mechanism is further enhanced by forces exerted on the seat to the 360° radius on the disc providing a secondary shaft seal.
  • Both seals are made without the shaft ever coming in contact with the media.
  • Elastomer seals are utilized to further assure no leakage to the outside environment. The seals are molded in o-rings in the shaft bore area of the seat.

APPLICABLE STANDARDS :

  • ANSI B16.1 – Conforms to ANSI Class 125 flange drilling.
  • ANSI B16.5 – Conforms to ANSI 150 flange drilling.
  • ANSI B16.42 – Conforms to ANSI Class 150 flange drilling, body wall thickness, and pressure-temperature ratings.
  • ANSI B16.104 – Exceeds Class IV shutoff requirements.
  • API 609 – Butterfly Valve Category A.
  • AWWA C504
    • Diameter of stainless steel shaft exceeds AWWA Class 75B standard.
    • Body wall thickness exceeds the AWWA Class 150B standard for butterfly valves.
  • MSS SP-25 – Markings and identification conform to the requirements.
  • MSS SP-67 – Butterfly Valves.
  • ISO 5211 – Actuator Mounting.
  • USCG – Category “A” Title 46, CFR, Part 56.

FEATURES :

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