Ball valve is a kind of valve that can be closed tightly with only 90 degree rotation and small rotation torque. The completely straight inner cavity of the valve body provides a small resistance and straight flow channel for the medium. It is generally considered that the ball valve is most suitable for direct opening and closing, but recent development has designed the ball valve to throttle and control flow. The main feature of the ball valve is its compact structure and easy operation and maintenance. It is suitable for general working media such as water, solvent, acid and natural gas, as well as media with poor working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The valve body of ball valve can be integral or combined.

Development and working principle

Ball valve is evolved from plug valve. It has the same 90 degree rotation lifting action, except that the cock body is a sphere with a circular through hole or channel passing through its axis. The ratio of the spherical surface to the channel port should be such that when the ball rotates 90 degrees, all spherical surfaces should appear at the inlet and outlet, so as to cut off the flow.

advantage:

The fluid resistance is small, and its resistance coefficient is equal to that of the pipe section with the same length;

Simple structure, small volume and light weight;

It is tight and reliable. At present, the sealing surface material of ball valve is widely used in plastic with good sealing performance, and has also been widely used in vacuum system;

It is easy to operate and open and close quickly. It only needs to rotate 90 ° from full open to full close, which is convenient for remote control;

The maintenance is convenient, the structure of the ball valve is simple, the sealing ring is generally movable, and the disassembly and replacement are relatively convenient;

When fully open or fully closed, the sealing surface of the ball and valve seat is isolated from the medium. When the medium passes through, it will not cause the erosion of the sealing surface of the valve;

It has a wide range of applications, ranging from small to a few millimeters and large to a few meters. It can be applied from high vacuum to high pressure.