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The working principle and selection method of valve fitting sphere

Jun 13, 2018

Valve accessories include many different types of products, including ball valves. The working principle of this product is to make the valve open or closed by rotating the ball. In comparison, the ball valve of the valve fitting is light and compact, can be made into a large diameter, reliable in sealing, simple in structure, and convenient in maintenance. The sealing surface and the spherical surface are often in a closed state and are not easy to be eroded by the medium, thus being in the market. Greatly welcomed by users.


At present, the ball valve of the valve fitting includes many types, such as a floating ball valve, a fixed ball valve, a metal hard seal ball valve, a clip-on ball valve, a thermal ball valve, a pipeline ball valve, a track ball valve, a top-mounted ball valve, a pigging valve, and a high pressure. Forged ball valves, V-ball valves, internally threaded ball valves, integral ball valves, cryogenic ball valves, bellows ball valves, three-way (four-way) ball valves, eccentric hemispherical valves, all-welded ball valves, and special ball valves.


For example, in the valve fitting O-ball valve, the structure is floating, the core is made of precision castings, hard chrome plating is applied, the valve seat is made of metal or reinforced PTFE material, and the flow passage is the same as the diameter of the pipeline. , The circulation capacity is extremely high, the flow resistance is extremely small, there is no leakage when closing, generally use the on-off valve, it is especially suitable for the high viscosity, contain fiber, granular medium.


In general, the ball valves for valve fittings have a particularly wide range of applications. Their nominal diameters range from 8 mm to 1200 mm; nominal pressures range from vacuum to 42 MPa; and operating temperatures range from -204°C to 815°C. Especially in the petroleum, chemical, metallurgical and other sectors, the use of soft-seal ball valves in flammable, explosive medium equipment and piping systems should pay more attention to fire resistance and fire protection.


Because of so many excellent performances, more and more ball valves for valve fittings are used for rapid opening and closing (1/4 turn), high pressure cut-off (large pressure difference), low noise, cavitation, and gas Phenomenon, leakage to the atmosphere, small operating torque, small fluid resistance in the pipeline system. In addition, the ball valve of the valve fitting is also suitable for the piping system with light structure, small differential pressure and corrosive medium. http://www.dmgcastings.com/