The working principle and characteristics of butterfly valve

The butterfly valve is a valve that opens and closes according to the rotary valve, which drives the disc plate to rotate. In the cylindrical channel of the butterfly body, the disc rotates around an axis, mainly rotating the plate 90 degrees. When the flow control disc reaches 90 degrees, the valve is fully opened, and the medium flow can be adjusted by changing the angle of the valve. Usually installed in the diameter direction of the pipe. Butterfly valves and stems themselves do not have a locking function. In order to effectively control the flow, a worm gear reducer is required. The butterfly valve with worm gear reducer can not only automatically lock the butterfly valve, but also change the working performance of the butterfly valve and adjust the medium flow more accurately.

Butterfly valve features:

(1) The structure is simple and the shape is small. Compact structure, short length, small size, light weight, suitable for large diameter.

(2) The fluid resistance is small. When fully opened, the effective flow area of ​​the valve channel is large and the fluid resistance is small.

(3) The opening and closing is convenient and fast, the performance is well adjusted, and the turning is 90 degrees. Can be opened and closed. By changing the rotation angle of the disc, the flow rate can be controlled in layers.

(4) The discs on both sides of the rotating shaft are basically the same as the medium, and the direction of torque is generated, so the switching torque is very small. Instead, it's easier to open and close.

(5) The low-pressure sealing performance is good, and the sealing surface material is generally made of rubber and plastic, and the sealing performance is good. The butterfly valve is limited by the material of the sealing ring, and the working pressure and working temperature range are lower. However, the operating pressure and operating temperature range of hard-sealed butterfly valves have been greatly improved.