This news is about the brief introduction of butterfly valve including the working priciple and its application features.
Butterfly valve is composed of valve body, disc, stem and handle. It adopts disc type opening and closing parts. The disc type valve disc is fixed on the valve rod, and the valve rod can be turned 90 degree to complete the process of opening and closing. At the same time, when the opening angle of the disc is 20 degree to 75 degree, the flow rate has a linear relationship with the opening angle, which has the characteristics of throttling.
Working principle: butterfly plate is driven by valve rod. If it is turned 90 degree, it can be opened and closed at a time. By changing the deflection angle of the butterfly plate, the medium flow can be controlled. The valve rod only rotates, and the butterfly plate and valve rod have no self-locking ability. A reducer with self-locking ability shall be attached to the valve rod to make the butterfly rod stop at any position.
Application features of butterfly valve:
(1) Simple structure, small size, short structure length, small volume, light weight, and it is suitable for large caliber valve.
(2) When the valve seat is fully open, the effective flow area of valve seat channel is large and the fluid resistance is small.
(3) It is convenient and quick to open and close, with good regulation performance.
(4) The opening and closing torque is small, because the butterfly plates on both sides of the rotating shaft are basically equal to each other under the action of medium. And the direction of torque is opposite, so it is easier to open and close.
(5) The sealing surface materials are generally rubber and plastic, so the low-pressure sealing performance is good, and it is suitable for the pressure below 2.0MPa and the temperature is not higher than 200 ℃.
