Tri-Eccentric Butterfly Valves: Introduction, Sealing Principle, Technical Parameters & Advantages

Tri-Eccentric Butterfly Valves are hard-sealed butterfly valves with a tri-eccentric structure. They feature three eccentric designs: eccentric shaft, eccentric cone and eccentric seat. Therefore, Tri-Eccentric Butterfly Valves can withstand higher temperatures and greater pressures, and achieve better sealing performance.

Different from concentric butterfly valves, Tri-Eccentric Butterfly Valves adopt a distinct design principle to cope with harsher working conditions.

Sealing Principle

Unlike concentric butterfly valves, the disc of the Tri-Eccentric Butterfly Valve does not form a concentric structure with the valve seat when closed, ensuring more reliable sealing performance.

High-Temperature and High-Pressure Applications

Due to their metal-to-metal sealing, Tri-Eccentric Butterfly Valves are usually used in demanding high-temperature and high-pressure working conditions — temperature ranging from -196℃ to 650℃, pressure ranging from PN10 to PN160 (ANSI CL 150~CL900), such as in the chemical, petroleum and natural gas industries.

Technical Parameters

• Product Name: Tri-Eccentric Butterfly Valve

• Actuation Methods: Worm Gear, Pneumatic, Electric Actuated, Manual

• Connection Type: Wafer Type, Flanged Type

• Structure Type: Tri-Eccentric

• Sealing Structure: Metal Hard Seal

• Pressure Range: 1.6MPa - 4.0MPa

• Nominal Diameter: DN50 - 1400

• Common Materials: WCB, A105, 304, 316, CF8, etc.

Advantages of Tri-Eccentric Butterfly Valves

• High-Temperature and High-Pressure Resistance: Compared with concentric butterfly valves, single-eccentric butterfly valves and double-eccentric butterfly valves, Tri-Eccentric Butterfly Valves can resist high temperature and high pressure.

• Reduced Friction: Tri-Eccentric Butterfly Valves reduce friction during valve operation, thereby achieving smoother performance and enhanced durability.

• Wide Application Range: Tri-Eccentric Butterfly Valves can withstand harsh environments and are suitable for a wide range of applications in the oil and gas, petrochemical, power generation and water treatment industries.