The butterfly plate of the soft seal butterfly valve is installed in the diameter direction of the pipe. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°.

The butterfly valve market is on the expansion as more types of butterfly valves are developed to go with the pneumatic actuators as well as electric ones.

The closing of the butterfly valve online (disc) in the middle of the medium, when the design should consider the influence of the convective resistance.

The two eccentricities of the double offset butterfly valve refer to the eccentricity of the rotating center line of the disc and the eccentricity of the sealing line and the eccentricity of the center line of rotation of the disc and the center line of the channel.

Further improved molding on the basis of the single offset butterfly valve is currently the most widely used double offset butterfly valve. The structural feature is that the stem axis is offset from the center of the disc and from the center of the body.

The offset butterfly valve is divided into single offset butterfly valve, double offset butterfly valve, and triple offset butterfly valve. A butterfly valve whose valve stem axis is at the same time deviated from the center of the disc and the center of the body, and whose sealing pair is a slanting vertebra is called an offset butterfly valve.

The superior performance of butterfly valve is closely related to their constant eccentricity, evolution and development. In order to meet various working conditions, the butterfly valve has experienced the evolution from concentric to single eccentricity, double eccentricity and triple eccentricity.

As a component used to realize the on-off and flow control of pipeline systems, the center line butterfly valve has been widely used in many fields such as petroleum, chemical, metallurgy, and hydro power.

A butterfly valve is a valve in which a closing part is a disc that rotates around the valve shaft to open and close, and is mainly used for cutting and throttling on the pipeline.

The butterfly valve application range:his manual contains manual, geared, electric and pneumatic operating butterfly valves with nominal diameters from DN50mm to 1600mm (2"~64") and nominal pressures from PN1.0MPa to 4.0MPa (ANSI CLASS150~300).