Ball works by the rotary valve love to make the valve flow or occlusion. Valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, easy maintenance, with the spherical sealing surface often in the closed state, the media can not easily be eroded, in various sectors has been widely used.

The main features of valve is its own compact, reliable sealing, simple structure, easy maintenance, with the spherical sealing surface often in the closed state, the media can not easily be eroded, easy operation and maintenance, general working water, solvents, acids, and natural gas is suitable for media, but also to poor working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene, in various sectors has been widely used. Ball valve can be integral, it can also be modular. Also known ball valve shut-off valves, valve seal is mandatory, so that when the valve is closed, must exert pressure on the valve to force the sealing surface does not leak. Ball works rotary valve love to make the valve flow or occlusion. Valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, easy maintenance, with the spherical sealing surface often in the closed state, the media can not easily be eroded, in various sectors has been widely used. High pressure ball valve divided into two categories, one is a floating ball type, the second is fixed ball valves.

Ball valves is mainly used for cut off or connected line of medium, it can be used for regulation and control of the fluid, which has a strong hard seal between the V-ball valves their core V-shaped ball valves and surfacing carbide metal seat shear force, especially for fiber-containing tiny solid granule and other media. The multi-way valve in the pipe can not only control the confluence flexible medium, diversion, and flow switch, but also to close any channel leaving the other two channels are connected.
It has the following advantages:
1. Little fluid resistance, the resistance coefficient equal to the same length of pipe.
2. Simple structure, small size and light weight.
3. Close and reliable valve sealing surface material widely used plastic, sealing, and has also been widely used in the vacuum system.
4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate remote control.
5. Easy maintenance, simple ball valves, seals are generally activities, the removal replacement is more convenient.
6. In the fully open or fully closed, the sealing surface and the dielectric isolation ball and seat, through the media, will not cause erosion of the valve sealing surface.
7. wide scope, from small to a few millimeters in diameter, large meters, from high vacuum to high pressure can be applied.
Shut-off valve is mandatory sealed valve stem to open or close the relatively short trip, and have very reliable cutting action, making this valve is suitable for medium off or regulation and throttle use. Therefore, when the valve is closed, it must exert pressure on the valve to force the sealing surface does not leak. When the media from below the valve into the valve, the operating force required to overcome the resistance, is the stem and packing friction thrust by the pressure generated by the media, close the valve of the force is greater than the force to open the valve, so the valve rod diameter should be large, otherwise the stem benders failures occur. Once the cut-off contact with the valve open valve condition, and its valve seat and valve sealing surface is no longer and has a very reliable cutting action, and combine this valve is suitable for medium cut or regulation and section stream use.
Shut-off Valve has the following advantages:
1, simple structure, manufacture and maintenance more convenient.
2, the working stroke is small, open and close a short time.
3, sealing, and the sealing surface friction force is small, longer life expectancy.
The disadvantage of the cut-off valves as follows:
1, the fluid resistance is large, large force is required to open and close.
2, does not apply with particles, viscosity, easy to medium coke.
3. Adjust poor performance.

Source: http://www.gmkvalve.com