Just use the rotary valve 90 degree rotation of the operation and a small torque can be closed tightly. Complete equality of the body cavity to provide a little resistance, through the flow channel for medium. Generally considered the most suitable valve opening and closing used directly to do, but the recent development has been designed so that it has a throttle valve and control the flow of. The main features of the valve itself is compact, easy to operate and repair, and is suitable for water, solvents, acids and natural gas general working media, but also applies to poor working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene. Ball valve can be integral, it can be modular. Valve works by rotating the valve to the valve flow or occlusion of love. Valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, convenient repair, sealing surface and spherical often in the closed state, the media can not easily be eroded, widely used in various industries. Ball valve and plug valve is one type of valve, closure of the only pieces of it is a sphere, the sphere rotates around the body center line to achieve a valve opening, closing.

Valve is forced closed the valve, the valve stem to open or close the relatively short trip, and can be * very cut off the action, makes this valve is ideally suited as a medium cut or regulation and throttle use. So the valve is closed, the valve must exert pressure to force the sealing surface does not leak. When the medium from the bottom of the valve into the valve, the operating force required to overcome the resistance, is the stem and the packing friction and pressure generated by the media thrust, force than the valve off the valve opening force, therefore, larger stem diameter, otherwise it will bend the stem top of the fault. Once the valve flap valve in the open position, its valve seat and valve sealing surface is no longer between the contact, and can be * very cutting action, and combine this valve is suitable for medium cut or regulation and throttle use!

Ball valve and cut-off valve in the advantages and disadvantages of basically has the following differences:

The direction of the flow valve in the pipeline is mainly used to make cutting, distribution and change the media. Ball valve is a new valve widely used in recent years, it has the following advantages:

1, fluid resistance small, the drag coefficient with the same length of pipe equal.

2, has the advantages of simple structure, small volume, light weight.

3, close and reliable, the current valve sealing surface material widely used plastic, good sealing, in the vacuum system has also been widely used.

4, the operation is convenient, quick open and close, from fully open to fully closed as long as the rotation of 90 DEG, facilitate remote control.

5, convenient maintenance, simple ball valve, seals are generally activities, the removal of the replacement is more convenient.

6, in the fully open or fully closed, the ball and seat sealing surface and the dielectric isolation, through the media will not cause erosion of the valve sealing surface.

7, wide scope of application, from small diameter to a few millimeters, a few meters from the large, high vacuum high pressure can be applied.

Ball has been widely used in petroleum, chemical, power generation, paper, nuclear energy, aviation, rockets and other departments, as well as people's daily life.

Valve has the following advantages:

1, has the advantages of simple structure, manufacture and maintenance more convenient.

2, the working stroke is small, open and close a short time. 

3, good sealing, the sealing surface between the friction force is small, longer life expectancy.

Valve defects are as follows:

1, fluid resistance, force required to open and close the larger.

2, do not apply with particles, viscosity, easy to medium coke.

3, poor regulation performance.