Triple Offset Butterfly Valve

Triple Offset Butterfly Valve: Comprehensive Product Overview

What is a Triple Offset Butterfly Valve

A triple offset butterfly valve (TOBV) is a high-performance industrial valve designed for precise flow control in demanding applications. Its unique geometry minimizes wear, ensures bubble-tight sealing, and operates efficiently under extreme temperatures and pressures. Unlike conventional butterfly valves, the TOBV employs a triple eccentric design to eliminate friction between the disc and seat during operation, making it ideal for critical services.

Understanding the “Triple Offset” Design

The term “triple offset” refers to three distinct geometric offsets in the valve’s construction:

1. First Offset: The valve shaft is positioned behind the seat’s centerline, enabling the disc to rotate without contacting the seat.

2. Second Offset: The shaft is offset from the pipeline’s centerline, creating a cam-like motion for smooth operation.

3. Third Offset: The seat surface is angled (conical profile), ensuring a wedging effect that enhances sealing as the valve closes.

This design eliminates sliding friction, reduces wear, and guarantees zero leakage even after prolonged use.

Key Specifications

Valve Sizes

- Standard Range: 2″ to 48″ (DN50 to DN1200).

- Custom Sizes: Available for specialized industrial requirements.

Pressure Ratings

- ANSI Classes: 150 to 600.

- PN Ratings: PN16 to PN100.

- Suitable for high-pressure systems up to 1,450 psi (100 bar).

Connection Types

- Flanged: ANSI, DIN, or JIS standard flanges.

- Wafer/Lug: Compact design for space-constrained installations.

- Butt-Weld: For permanent, high-integrity piping systems.

Materials

- Body/Trim: Stainless steel (SS316, SS304), duplex steel, carbon steel, Inconel®, Hastelloy®.

- Seat: Resilient metal-to-metal seals or laminated composite materials (e.g., graphite + stainless steel).

- Disc: Often coated with stellite or ceramic for abrasion resistance.

Operating Conditions

- Temperature Range: -196°C to 850°C (-320°F to 1,562°F).

- Media: Compatible with steam, hydrocarbons, corrosive chemicals, and cryogenic fluids.

- Industries: Oil & gas, power generation, chemical processing, LNG, and marine.

Advantages of Triple Offset Butterfly Valves

1. Zero Leakage: Metal-seated design meets ISO 5208 Leakage Class A (bubble-tight).

2. Long Service Life: No friction ensures minimal wear, even after thousands of cycles.

3. Low Maintenance: No regular lubrication or seat replacement required.

4. Versatility: Adaptable to extreme temperatures, pressures, and corrosive media.

Applications

- Oil Refineries: Isolation and regulation of crude oil, gas, and refined products.

- Power Plants: Steam isolation in turbines and boilers.

- Chemical Plants: Handling acids, alkalis, and aggressive fluids.

- Cryogenic Systems: LNG storage and transportation.

Compliance & Certifications

- Standards: API 609, ASME B16.34, ISO 5752.

- Fire-Safe Design: Compliant with API 607/API 6FA for fire-resistant applications.

The triple offset butterfly valve combines precision engineering with robust materials to deliver unmatched reliability in critical industrial processes. Its advanced design addresses the limitations of traditional valves, making it a preferred choice for modern high-performance systems.

Newsway Valves Materials

NSW valve body and trim material can be offered in Forged type and Casting type. Next to stainless and carbon steel material, we also manufacture valves in special materials such as titanium, nickel alloys, HASTELLOY®*, INCOLOY®, MONEL®, Alloy 20, super-duplex, corrosion resistant alloys and urea grade materials.

Available materials