ANSI Triple Offset Butterfly Valve

Engineered for tight shut-off and long-lasting performance, the ANSI Triple Offset Butterfly Valve delivers true metal-to-metal sealing for demanding oil, gas, chemical, and industrial pipeline applications. Its triple offset geometry ensures smooth operation, minimal wear, and zero leakage under high pressure and temperature conditions.

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Description

Product Overview

The ANSI Triple Offset Butterfly Valve is a high-performance isolation valve designed in accordance with American standards. By adopting a triple offset geometry, this valve achieves true metal-to-metal sealing, effectively eliminating friction between the sealing surfaces during operation. It is especially suitable for demanding applications that require tight shut-off, high temperature resistance, and long service life.

Triple Offset Design Principle

The triple offset structure refers to three carefully engineered eccentricities:

First Offset – The shaft is positioned behind the centerline of the sealing surface, reducing direct contact between the disc and seat.

Second Offset – The shaft is offset from the pipeline centerline, allowing the disc to disengage smoothly from the seat during opening.

Third Offset – A conical sealing surface ensures that the disc and seat make contact only at the final moment of closing, achieving zero leakage without rubbing.

This design significantly reduces wear, operating torque, and maintenance requirements compared with conventional butterfly valves.

Standards & Specifications

Design Standard: API 609 / ASME B16.34

Face to Face: ASME B16.10

Flange Standard: ASME B16.5 / ASME B16.47

Pressure Rating: ANSI Class 150 / 300 / 600

Size Range: 2” – 80” (DN50 – DN2000)

Leakage Class: API 598 / ISO 5208 Rate A (Zero Leakage)

Materials

Body: Carbon Steel (WCB), Stainless Steel (CF8, CF8M), Alloy Steel

Disc: Stainless Steel, Duplex Stainless Steel, Alloy Steel

Seat: Laminated metal seat (SS + Graphite or SS + Alloy)

Stem: Stainless Steel / High-strength alloy steel

Material selection can be customized according to medium, temperature, and pressure conditions.

Key Advantages

True zero leakage with metal-to-metal sealing

Excellent performance in high temperature and high pressure service

Lower operating torque and extended service life

Suitable for bidirectional flow

Fire-safe and anti-blowout stem design available

Applications

ANSI Triple Offset Butterfly Valves are widely used in:

Oil & Gas

Refining and Petrochemical plants

Power generation

Chemical processing

Steam and high-temperature systems

Water and industrial utility pipelines

Operation & Actuation

Available operation types include:

Lever operation

Gearbox operation

Electric actuator

Pneumatic actuator

Quality & Testing

Each valve is manufactured under strict quality control procedures and tested according to API standards to ensure reliable sealing performance and operational safety before delivery.