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The difference between ball valve and butterfly valve
The biggest difference between a ball valve and a butterfly valve is that the butterfly valve opening and closing piece is a plate and the ball valve is a ball. The valve plate of the butterfly valve and the valve core of the ball valve rotate around their axes. The valve plate of the valve is along the axis For lifting movement; butterfly valve and gate valve can be adjusted by the opening degree of flow; ball valve is not easy to do this. Butterfly valve is characterized by quick opening and closing speed, simple structure, low cost, but the tightness and pressure capacity is not good. The characteristics of the ball valve and valve similar, but by the volume and opening and closing resistance constraints, it is difficult to achieve large diameter. The structural principle of the butterfly valve is particularly suitable for the production of large-diameter butterfly valve butterfly valve installed in the diameter direction of the pipe. In the butterfly valve body cylindrical channel, the disc-shaped disc rotates about the axis, the rotation angle is between 0 ° ~ 90 °, when rotated to 90 °, the valve is fully open state card. Its simple structure, low cost, adjustable range larger. Ball valves are generally suitable for liquids and gases with no particulate impurities, low fluid pressure loss, good sealing performance and high cost. In comparison, the ball valve seal better than the butterfly valve. Ball valve seal is the long-term squeeze on the spherical seat by the valve, it certainly wear faster than the semi-ball valve, the ball valve seal is usually flexible materials, it is difficult to use in high temperature and pressure pipe. Butterfly valve seal is rubber-based, it is far more than the semi-spherical valve, ball valve, gate valve metal seal performance. After long-term use of the semi-spherical valve, the valve seat will also produce a slight wear, it can be adjusted to continue to use, the stem and packing valve stem rotation during opening and closing only 90 °, there are signs of leakage, and then compress the packing gland Bolt a little, you can achieve no leakage at the packing, and other valves are still a small leak barely used, a large leak valve. Ball valve during opening and closing process by the valve seat at both ends of the holding force under the operation, it is larger than the half-ball valve opening and closing torque, the larger the nominal diameter opening and closing torque difference more obvious, the valve opening and closing is to overcome the deformation of the rubber To achieve more torque. The gate valve, globe valve operating time is long and strenuous. Ball valve and plug valve are of the same type of valve, and only its closure is a sphere, the sphere around the centerline of the valve body to rotate to achieve open, close a valve. Ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium.