Triple Offset Flanged Butterfly Valve

Product Overview

The Triple Offset Flanged Butterfly Valve is designed for precise flow control and reliable shut-off in demanding industrial environments. Its triple offset design eliminates contact between the disc and seat during rotation, resulting in exceptional durability and extended service life.

Unlike conventional butterfly valves, the triple offset configuration creates a cam-like action that ensures the disc contacts the seat only at the fully closed position. This non-contact operation minimizes wear and allows for tight sealing even in high-temperature and high-pressure applications.

Our Triple Offset Flanged Butterfly Valve is constructed with a rugged body and high-performance materials, making it ideal for oil & gas, power generation, chemical processing, and water treatment industries.

Key Features & Benefits

Triple Offset Design

Eliminates seat contact during rotation, reducing wear and ensuring bubble-tight shut-off.

High-Temperature Performance

Capable of operating in temperatures up to 1000°F (538°C) with metal seats.

Compact Flanged Design

Space-saving design with flanged ends for easy installation between standard ANSI flanges.

Bi-Directional Flow

Symmetrical design allows for equal performance in both flow directions.

Corrosion Resistance

Available in stainless steel and other corrosion-resistant materials for harsh environments.

Easy Maintenance

Replaceable seat and disc allow for quick maintenance without removing the valve from the pipeline.

Technical Specifications

Basic Parameters

Parameter	Specification Range
Nominal Diameter (NPS)	2" ~ 72" Common Sizes: 4", 6", 8", 10", 12", 16", 20", 24"
Class Rating	Class 150, Class 300, Class 600
Operating Temperature	-20°F ~ 450°F (Elastomer Seats) -20°F ~ 1000°F (Metal Seats)
Applicable Media	Natural Gas, Crude Oil, Steam, Water, Chemicals, Slurries, Abrasive Fluids
Sealing Class	API 598 Class VI (Elastomer Seats), Class IV (Metal Seats)

Material Specifications

Component	Material Options	Standards/Features
Valve Body	Carbon Steel, Stainless Steel	ASTM A216 WCB, ASTM A351 CF8/CF8M, Flanged Ends per ANSI B16.5
Disc	Stainless Steel	AISI 304/316, Hardened to 55-60 HRC for Abrasion Resistance
Seats	Elastomer, Metal	PTFE, Viton® for Elastomer Seats; Stellite for Metal Seats
Stem	Stainless Steel	AISI 416/420, Anti-Blowout Design with PTFE Packing
Actuator	Manual, Pneumatic, Electric	Handwheel, Scotch Yoke Pneumatic Actuator, Electric Motor Actuator

Standards & Compliance

Design Standards: API 609, ISO 10631
Flange Standards: ANSI B16.5 Class 150/300/600
Testing Standards: API 598, Hydrostatic and Leakage Testing
Certifications: CE, API 609, ISO 9001

Working Principle

The Triple Offset Flanged Butterfly Valve controls fluid flow using a triple offset mechanism:

Triple Offset Design: The disc is offset from the centerline of the shaft, the centerline of the valve body, and the centerline of the seat. This creates a cam-like motion that ensures the disc contacts the seat only at the fully closed position.
Opening Process: Rotating the handwheel or actuator turns the disc away from the seat, allowing media to flow through the valve. The non-contact operation minimizes wear and reduces torque requirements.
Closing Process: Reverse rotation brings the disc into contact with the seat, creating a tight seal. The triple offset design ensures even pressure distribution and reliable shut-off.

Application Areas

Oil & Gas

Pipelines, refineries, and offshore platforms.

Power Generation

Boiler feedwater, cooling water, and steam systems.

Chemical Processing

Acids, bases, and other aggressive chemicals.

Water Treatment

Municipal water, wastewater, and desalination plants.

Installation & Maintenance

Installation Guidelines

Inspect valve for damage and confirm closed position before installation; clean pipeline flanges to remove debris.
Install between flanges using appropriate gaskets; ensure valve is centered and bolt holes align with flange holes.
Tighten flange bolts evenly in a crisscross pattern to avoid uneven pressure on the valve body.
Ensure actuator is mounted correctly and operating in the proper direction (clockwise to close, counterclockwise to open).
Conduct hydrostatic testing (1.5×Class Rating) and leakage testing after installation before commissioning.

Maintenance Recommendations

Regularly inspect stem packing for leaks; adjust or replace packing as needed to maintain stem seal integrity.
Check disc and seat for signs of wear or damage; replace disc or seat if necessary to maintain sealing performance.
Lubricate stem threads and actuator components periodically with appropriate lubricant to ensure smooth operation.
For long-term shutdown, flush valve with clean water to remove any residual media and prevent hardening.
Use only manufacturer-recommended replacement parts to maintain performance and compliance with standards.

Frequently Asked Questions (FAQ)

Q: What is the difference between a triple offset butterfly valve and a double offset butterfly valve?

A: A triple offset butterfly valve adds a third offset to the disc, eliminating contact with the seat during rotation and providing superior sealing performance compared to double offset valves.

Q: Can triple offset butterfly valves be used for throttling applications?

A: Yes, triple offset butterfly valves can be used for throttling, but their primary design is for on/off service. For precise flow control, consider a control valve with a characterized disc.

Q: What type of actuator is best for a Triple Offset Flanged Butterfly Valve?

A: The choice of actuator depends on the application. Manual handwheels are suitable for infrequent operation, while pneumatic or electric actuators are preferred for automated or remote operation.

Q: Are Triple Offset Flanged Butterfly Valves suitable for high-pressure applications?

A: Yes, with appropriate material selections and class ratings (up to Class 600), Triple Offset Flanged Butterfly Valves can handle high-pressure applications in oil & gas, power generation, and chemical processing.

Need Custom Solutions?

Our engineering team can customize Triple Offset Flanged Butterfly Valves to meet your specific pressure, temperature, and media requirements. Contact us today for a personalized quote.

Contact Our Technical Team