Butterfly valve triple offset - S96/3 | Alfa Europe | Philippopoulos s.a.
Butterfly valve triple offset - S96/3 | Alfa Europe | Philippopoulos s.a.

Butterfly valve triple offset - S96/3 | Alfa Europe

Triple Offset Butterfly Valve Alfa Europe S96/3

The S96/3 is a triple offset, wafer type butterfly valve designed for isolation in industrial lines where concentric butterfly valves are insufficient due to temperature, pressure, or sealing requirements. It covers DN50–DN1200, with flanges PN10/16/25/40 and ANSI Class 150/300. The face-to-face dimensions comply with ISO 5752 / API 609.

Operational Limits

  • Connection: wafer
  • Temperature: -196 to +800 °C
  • Dimension Standards: ISO 5752, API 609
  • Torque tables available for 150#/PN10/16/25, 300#/PN40, and 600#/PN64, with significant torque increase at higher pressure classes.

Triple Offset Design

The triple offset geometry removes the disc from the seat during opening, minimizing friction on sealing surfaces. This choice is relevant in applications with thermal cycles, high ΔP, or frequent on/off operations where seat wear is a critical factor.

Sealing and Materials

Due to the temperature range, the selection of seat, packing, and body material must be confirmed per service. For cryogenic or high-temperature applications, conventional elastomer liners are not used; suitable metallic or graphite seals are required, depending on pressure, fluid, and operational cycles.

Typical Applications

  • Steam and thermal networks.
  • Oil, fuels, and hydrocarbons.
  • Chemical and petrochemical lines.
  • Industrial gases.
  • Energy and process utility systems.

Actuation

Actuator selection is based on DN, pressure class, ΔP, temperature, and required torque. In large diameters or high-pressure classes, a reducer, pneumatic, electric, or hydraulic actuator is typically required.

FAQ

When to choose over double offset?
When lower seat friction, operation at higher temperatures, or metallic sealing is required.

Is it suitable for throttling?
It can be used for throttling only after checking Kv/Cv, ΔP, noise, cavitation, and actuator torque.

Datasheet and documents

Description

Range: Size DN50 – DN1200

End connection: Wafer type

Flange connection: flanges PN10/PN16/25/40 & ANSI 150, 300#

Temperature range: -196° to +800 °C

Face to face: according ISO 5752, API609

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