Triple Eccentric Butterfly Valves

Overview

The Triple Eccentric Butterfly Valve is an advanced valve design that enhances the functionality and performance of traditional butterfly valves. With three offset axes, it provides superior sealing and minimizes wear and tear on the valve seat, even in high-pressure and high-temperature environments. This valve offers exceptional flow control and reduces the need for high torque, making it ideal for applications that demand precise regulation in challenging industrial conditions. The triple eccentric design significantly improves longevity, ensuring consistent performance and reduced maintenance needs over time.

Engineered for precision and reliability, the Triple Eccentric Butterfly Valve minimizes friction between the valve seal and the seat, offering smooth operation with lower pressure drops. The unique triple eccentric design enhances performance by allowing for tight sealing while preventing damage to the seat. Commonly used in industries such as oil and gas, power generation, and chemical processing, this valve excels in demanding environments where durability, high-performance, and reduced downtime are critical. Its robust construction ensures maximum efficiency and extended service life in heavy-duty applications.

Design Characteristics of Triple Eccentric Butterfly Valve The Triple Eccentric Geometry

The first eccentric, shaft deviated from the centerline of sealing face.
The second eccentric, shaft deviated from the centerline of pipe and valve.
The third eccentric, the distinctive included angle between oblique taper angle of eccentric seat and centerline of pipe, thus making the seat completely disengaged from the sealing ring during the whole process of open and close. This structure not only uses effect, but also eliminates the possibility of abrasion and leakage.
The zero leakage of our triple eccentric butterfly valve is implemented by the composite stainless steel sealing ring mounted on the disc.
Zero leakage is implemented by the elastic sealing ring mounted on the disc. The elasticity if sealing ring (see fig.) is produced by its radial compression and flexibility. The contact surface between the sealing ring and seat is an oblique cone. The contact angle between them gives slight ‘wedge effect’, making the sealing ring producing flexibility and radial compression. The even contact between the seat and sealing ring, and the elasticity of sealing ring makes the load on the seat even, thus to perform closest cutoff by the lowest torque.
The elasticity produced by the torque makes the valve closely cut off, regardless of the flow direction or pressure of medium.

Characteristic

Elastic property of composite metal sealing ring to perform zero leakage.
Torque seal to ensure persistent two-way zero leakage
The design of right-angled rotation with zero friction is implemented by the distinctive triple eccentric principal. It eliminates the friction O between the seat and sealing ring in 90 rotation.
STL one-piece hard-surface seat may adapt to many working conditions, which is featured by long service life and easy maintenance.
One-piece cast (sheet welded) body, face-to-face dimensions conforming to ISO5752, ASME B16, 10 nad API609, replacement to high performance butterfly valves and other types of valves, easy and flexible installation
Intrinsical fireproof property thanks to all metal structure and leak-tight performance.
Anti-blowout stem for high dependability, completely conforming to API609.
The valve position indicator on the stem and the flange mounted at the top are in favor of the indication of disc position.
The stem of triple eccentric butterfly valve is a shaft, stem, and disc are connected by key or pin-key combination.

Materials List (Triple Eccentric Butterfly Valve)

No	Part Name	Material	Optional Materials
1	Body	Cast Steel	SS, Monel
2	Key	SS	SS, Monel
2a	Pin	SS	Monel
3	Stem	SS	316, Monel
4	Disc	Cast Steel	SS, Monel
5	Seal Ring	PTFE+SS	SS+Graphite
6	Retainer Flange	Carbon Steel	SS, Monel
7	Bolt	B7	SS
8	Bolt	B7	SS
9	Cover	Carbon Steel	SS, Monel
10	Gasket	Graphite	Graphite
11	Bushing	PTFE+Bronze	Graphite
12	Bushing	PTFE+Bronze	Luberized Bronze
13	Packing Seat	SS	Luberized Bronze
14	Packing	Graphite	SS, Monel
15	Bolt	B7	PTFE
16	Packing Bushing	SS	SS
17	Nut	2H	SS
18	Bolt	B7	SS
19	Yoke	Carbon Steel

Product Range

1. Triple Eccentric Wafer Butterfly Valve

A compact and lightweight valve solution designed for installations with limited space. The wafer-style body ensures easy alignment and installation between flanges, while the triple offset geometry guarantees minimal wear, smooth operation, and high sealing integrity. Best suited for systems requiring precise control and zero leakage in compact layouts.

2. Triple Eccentric Flange Butterfly Valve

Engineered for permanent, high-integrity connections, this valve features welded ends that eliminate flange-related leak points. The double offset geometry reduces friction during opening/closing, enabling smoother operation and longer seat durability. Perfect for high-pressure applications in oil & gas, petrochemical, and steam lines.

3. Triple Eccentric Welding Butterfly Valve

Engineered for permanent installations, this fully welded valve ensures high structural integrity and leak-proof performance. The triple eccentric mechanism eliminates seat friction, extending operational life and ensuring consistent sealing in critical pipelines. Commonly used in high-pressure, high-temperature, and safety-sensitive applications such as power plants and chemical industries.

Triple Eccentric Butterfly Valves