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Introduction of ball valve
Apr 27, 2018

Ball valve, standard GB/T21465-2008 "valve terminology" is defined as: opening and closing parts (spheres) driven by the stem, and revolving around the stem axis of the valve. It is mainly used to truncate or connect the medium in the pipeline, and can also be used to regulate and control the fluid. The hard sealed V ball valve has a strong shear force between the V core and the metal valve seat of the hardfacing hard alloy. It is especially suitable for the medium containing the fiber and the tiny solid material. The multi - ball valve can not only flexibly control the switching of the flow, shunt and flow of the medium, but also close any channel and connect the other two channels. Valves of this type should be installed horizontally in pipes. Classification of ball valves: pneumatic ball valves, electric ball valves and manual ball valves.

The main features of the ball valve are compact structure, reliable seal, simple structure, convenient maintenance, closed seal surface and spherical surface, not easy to be eroded by medium, easy to operate and maintenance, suitable for water, solvent, acid, natural gas and other general working medium, and also suitable for poor working conditions, such as oxygen. Hydrogen peroxide, methane and ethylene have been widely applied in various industries. The ball valve body can be integral or modular.

Advantage:

1. the fluid resistance is small, and the full diameter ball valve basically has no flow resistance.

The 2. is simple in structure, small in size and light in weight.

3. is closely dependable. It has two sealing surfaces, and the sealing materials of ball valves are widely used in various kinds of plastics. The sealing performance is good and can be completely sealed. It has also been widely used in the vacuum system.

4. easy operation, quick opening and closing, and full turn to full clearance as long as 90 degrees of rotation to facilitate remote control.

5. maintenance is convenient, the ball valve structure is simple, the seal ring is generally active, dismantling and replacement are more convenient.

6. when fully open or fully closed, the sealing surface of the ball and valve seat is separated from the medium. When the medium is passed, the sealing surface of the valve will not be eroded.

7. it has wide application range, small to several millimeters, large to several meters, and can be applied from high vacuum to high pressure.

8. because the ball valve is wiped in the process of opening and closing, it can be used in the medium with suspended solids.

Ball valves are classified according to function:

1. Bypass valve: the ball valve is normally opened for static water, so the bypass valve is first pressed, that is, both sides are filled with water.

2, the air valve: when filling the water, remove the air and use the float to shut the valve by itself; when draining, replenish the air, the buoy will fall down on its own.

3. Pressure relief valve: when opening and closing the valve, remove the pressure water between the valve and the sealing cover so as not to wear the sealing cap tightly.

4. Drain valve: drain the sewage from the lower part of the shell.

The ball valve with transmission mechanism can be divided into: (1) pneumatic ball valve; (2) electric ball valve; (3) hydraulic ball valve; (4) pneumatic and liquid ball valve; (5) electro-hydraulic ball valve; (6) turbine drive ball valve.