Ball Valve

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Ball Valve

Post  landoo on Wed Dec 26, 2012 12:55 am

The ball valve is defined as: opening and closing parts (ball) is driven by the stem, and around the valve stem axis rotary motion. Mainly used to cut off or turned on the media in the pipeline, also for the regulation and control of fluid between hard seal V-valve V-ball core surfacing carbide metal seat which has a strong shear shear force, especially suitable for containing fibers, a tiny solid particles such medium. Multi-way ball valve in the pipeline, not only flexible control of the confluence of the media streaming and switch the flow direction, but also to close any one channel the other two channels connected. The class of the valve in the pipeline should generally be mounted horizontally. Ball valve Category: Pneumatic ball valve, electric ball valves, manual ball valve.
The main features of valve is its own compact, reliable sealing, simple structure, easy maintenance, the spherical surface and seal often in the closed state, is not easy to be medium erosion, easy operation and maintenance, applicable to the general work of the water, solvents, acids, and natural gasmedia, but also applicable to the harsh working conditions of the medium, such as oxygen, hydrogen peroxide, methane and ethylene, etc., widely used in various industries. Ball valve can be a whole, it can be modular.
Ball valve is not only a simple structure, good sealing performance, but also in the public that the smaller diameter range, light weight, less material consumption, small size of the installation, and the drive torque is small, easy to operate, easy to open and close fast, is nearly ten years the fastest growing one of the valves varieties. Axis of rotation 90° to achieve the purpose of the open and close ball valve is evolved by plug valves, opening and closing pieces as a sphere, using a sphere around the stem. The ball valve in the pipe is mainly used for cutting, distribution and change the direction of medium flow, designed as a V-shaped opening of the ball valve also has a good flow regulating function.
Since the ball valve usually rubber, nylon, and PTFE as the seat ring material, so the temperature of its use is limited by the material of the valve seat ring. Valve cutoff function is accomplished by metal sphere in the role of medium, pressed against each other between the plastic seat (floating ball valve). Valve seat ring contact pressure, occur locally elastic-plastic deformation. This distortion can be compensated for the manufacturing precision and the surface roughness of the sphere, to ensure the sealing performance of the ball valve.
Also, because the valve seat ring is usually made of plastic, it is in the choice to consider on the structure and performance of the ball valve, ball valve for fire resistance and fire, especially in the sector of the petroleum, chemical, metallurgy, flammable, explosive media equipment and piping systems used in ball valve, should pay attention to the fire-resistant and fire.
Typically, in the double-digit adjusted strict sealing performance, mud, wear, necking channel, the rapid opening and closing movement (1/4 turn to open and close), high-voltage cut-off (pressure), low noise, cavitation and gasification phenomenon a small amount of leakage to the atmosphere, the operating torque is small, small fluid resistance in the piping system, it is recommended to use the ball valve.

landoo

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