DN900 pneumatic triple eccentric hard seal butterfly valve

Basic Structure And Sealing Ring Form:

Eccentric butterfly valve design has three eccentricity: 

The rotation axis of the valve plate deviates from the cross section center of the sealing surface of the valve plate(H1; 

The axis of rotation deviates from the center of the pipe (H2). The rotation axis of the valve seat forms an Angle a ° with the axis of the valve body channel to form three eccentricities.

When it is opened, all points on the sealing surface of the valve plate are separated from the sealing ring at the same time, and there is no extrusion between the valve plate rotation and the sealing ring, which improves the life of the sealing ring. The sealing surtace can be automatically adjusted to maintain the best sealing effect. Multilayer composite sealing ring, leakage level is Vl, zero leakage. When theall-metal sealing ring is used, the leakage grade is V. 

What is the main difference between triple eccentric butterfly valve and double eccentric butterfly valve?

Both double-eccentric butterfly valves and triple-eccentric butterfly valves are widely used in industrial applications, but there are some important differences in the structural design between the two:

The eccentric design is different: 

The double eccentric butterfly valve has only two eccentric points, which are the valve stem deviating from the center of the valve plate and the valve stem deviating from the center of the pipe. This causes slight contact between the valve plate and the sealing surface when the valve is opened, causing wear. The triple-eccentric butterfly valve has an additional tapered eccentric point, which further reduces friction when the valve is opened and improves sealing performance.

Difference in sealing performance: 

Since the triple eccentric design can provide friction-free sealing when closing, the sealing performance of the triple eccentric butterfly valve is significantly better than that of the double eccentric butterfly valve. When double-eccentric butterfly valves are frequently switched on and off, the sealing surface is prone to wear, while triple-eccentric butterfly valves effectively avoid this problem and are suitable for more demanding working conditions.

Differences in durability and application scenarios: 

Double eccentric butterfly valves are more suitable for fluid control under normal temperature and pressure, while triple eccentric butterfly valves can maintain excellent sealing in high temperature, high pressure, and highly corrosive situations, and are suitable for high-pressure steam systems. , chemical equipment and other complex working conditions.

Application conditions of triple eccentric hard seal butterfly valve

Due to its excellent sealing performance, high temperature resistance, corrosion resistance and long life, triple eccentric hard seal butterfly valve is suitable for various extreme and harsh industrial conditions. Specific application conditions include but are not limited to:

High temperature and high pressure environment: 

Triple eccentric hard seal butterfly valve can withstand high temperatures up to hundreds of degrees Celsius, and is suitable for high-pressure pipeline systems, such as steam pipelines and boiler systems in power plants.

Corrosive medium transportation: 

In the chemical and petrochemical industries, the medium may be highly corrosive. The triple-eccentric hard-seal butterfly valve can use corrosion-resistant metal sealing materials to ensure that it will not fail after long-term use. It is often used in acid, alkali and salt solution transportation pipelines.

Occasions to prevent medium backflow: 

Due to its zero leakage characteristics, triple eccentric hard-seal butterfly valves are often used in systems that require the medium to not flow back, such as oil and natural gas transmission pipelines.

High-frequency opening and closing operations: 

In situations where frequent opening and closing is required, such as emission control in sewage treatment systems, the triple-eccentric hard-seal butterfly valve can greatly reduce maintenance frequency and costs with its long life and anti-wear performance.

Harsh hydraulic conditions: 

Triple eccentric hard-seal butterfly valves can also provide reliable sealing effects when handling high-speed fluids or fluids with particles, so they are widely used in hydraulic regulating equipment in water conservancy projects.

Triple-eccentric hard-seal butterfly valve has become one of the indispensable key equipment in modern industry with its unique structural design and excellent durability. It solves many common sealing problems, especially in complex working conditions of high temperature, high pressure, and strong corrosiveness, showing excellent performance and reliability.