The working principle and characteristics of butterfly valves

Release time:

2021-11-09

A butterfly valve is a valve that opens and closes based on the rotation of a disc. It drives the disc to rotate within the cylindrical passage of the butterfly body.

1. Working Principle

The butterfly valve is a valve that opens and closes based on the rotation of the valve, driving the disc to rotate. In the cylindrical passage of the butterfly body, the disc rotates around the axis, mainly rotating the plate 90 degrees. When the flow control plate reaches 90 degrees, the valve is fully open, and the medium flow can be adjusted by changing the angle of the valve. It is usually installed in the diameter direction of the pipeline. The butterfly valve and the valve stem itself do not have a locking function. To effectively control the flow, a worm gear reducer is needed. The butterfly valve with a worm gear reducer not only can automatically lock the butterfly valve but also can change the working performance of the butterfly valve, allowing for more accurate adjustment of the medium flow.

 2. Characteristics

(1) Simple structure, small size. Compact structure, short length, small volume, and light weight, suitable for large diameters.

(2) Low fluid resistance. When fully open, the effective flow area of the valve passage is large, resulting in low fluid resistance.

(3) Convenient and quick opening and closing, good performance adjustment, turning 90 degrees. It can be opened and closed. By changing the rotation angle of the disc, the flow rate can be controlled in layers.

(4) The butterfly plates on both sides of the rotating shaft are basically the same as the medium, generating a small direction of torque, thus making the opening and closing torque very small. Conversely, it is easier to open and close.

(5) Good low-pressure sealing performance, with sealing surface materials generally made of rubber and plastic, providing good sealing performance. The butterfly valve is limited by the sealing ring material, resulting in a lower working pressure and working temperature range. However, the usage pressure and working temperature range of hard-sealed butterfly valves have greatly improved.

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