Ball valve just rotated 90 degrees for operation and very little torque, they can shut tightly. Complete equality of the body cavity provides the media with very little resistance, through the channel. Generally considered most suitable for use by direct opening and closing the ball valve, but the recent development of the ball valve has been designed so that it has a throttle and control flow. Ball valve itself are the main features compact structure, easy operation and maintenance, suitable for water and gas, solvents, acids and other working media, the media but also to poor working conditions, such as oxygen, hydrogen peroxide, ethylene and methane, and so on. Ball valve can be whole, or they can be combined.
Evolution and principle of
Ball valves are evolved from the stopcock. It rotated 90 degrees with the same action, unlike the cock body is a sphere, round holes or channels through its axis. Spherical and openings should be such that when the ball is rotated 90 degrees, at the inlet and outlet should be spherical, so as to cut off flow
1, fluid resistance, the drag coefficient and the same segment equal in length.
2, simple structure, small size, light weight.
3, compact and reliable, now widely used plastic ball valve sealing surface material, good seal, already widely used in the vacuum system.
4, easy to open and close rapidly, from fully open to fully closed as long as the rotate 90 ° for easy remote control.
5, easy maintenance, simple ball valve structure, seals are generally active, remove replacement easier.
6, when in the fully open or fully closed, sphere and the sealing surface of the dielectric isolation valve seat, medium pass, does not cause erosion of the sealing surface.
7, the application of a wide range of sizes from small to a few millimetres, to several meters from the high vacuum high pressure can be applied