linear bearings

Ball valve history and several main types

by:AIRWOLF     2020-05-22
Ball valve is available in the 1950 s, the rapid development of science and technology, the continuous improvement of production technology and product layout, are in just 40 years, quickly developed into a kind of main valve. Is rich country industry country, the use of ball valve anyway in the unceasing rise year by year, is our country, type knife gate valve is widely used is oil refining, long pipeline, chemical industry, papermaking, pharmacy, water conservancy, electricity, municipal, iron and steel industries, is the yi yi nearly outside the economic position of the light heavy lift foot. The origin of the ball valve and function & ndash; Ball valve, ball valve to do with the ball valve is mainly used to cut or connect the property of outside tube, 1 a2b3c4d recuperate in fluid control, outside its soft seal v-shaped ball valve of the v-shaped ball core take soft surfacing alloy with no strong shear force between metal valve seat, especially suitable for fiber, such as small solid makings of. Spirit and ball valves are more connected line not only can control of confluence, shunt, and flow switch, at the same time can also be closed any channel and make the other two. Ball valve rotates 90 degrees it has no moving, the cock body is, there are square hole or channel through its axis. Ball valves were outside the tube is mainly used to do, the distribution and change of the flow of the underlying index, manual ball valve as long as you want to do with 90 degrees of operating and caution of small rotational torque can be closed. Ball valve is suitable to do the most used switch, block valve, but recent development will not ball valve designed to make it with no throttling and control the flow of ball valve. Such as V type ball valve. Ball valve's main characteristic is its layout is compact, reliable sealing, brief 1 a2b3c4d layout, convenient maintenance, take spherical sealing surface often is closed, it is easy to be property of erosion, difficult to operate and repair, suitable for water, solvents, acids and natural gas etc. Normal operating interface, but also is suitable for the workers to do grappled with the conditions of interfaces, such as oxygen, hydrogen peroxide, methane and ethylene, is being widely used in various industries. Is a general electric ball valve body can, and can also be combined. Ball valve floating ball valve ball valve a few categories of sphere is floating, under the effect of medium pressure, the fitness ball produce certain displacement and compression at the outlet seal surface, guarantee the outlet seal. Floating ball ball valve has simple structure, good sealing, but all spheres of work under medium load to export sealing ring, so want to consider to seal material can withstand the working load of sphere medium, under high pressure shock, sphere migration may occur. In this structure, is generally used in low pressure ball valve. Fixed ball ball valve ball valve ball is fixed, does not produce mobile after compression. Fixed pneumatic ball valves have a floating valve seat, the medium pressure, mobile seat, make the seal compression on the ball, to ensure the seal. Usually mounted on the upper and lower shaft with ball bearing, the operating torque is small, suitable for high pressure and large diameter of the valve. To reduce the number of ball valve operating torque and increase the reliability of the sealing, appeared in recent years, oil seal ball valve, both betting special lubricant between the sealing surface, in order to form a layer of oil film, which increases the sealing, and reduce operating torque, suitable for high pressure large diameter ball valve. Elastic ball ball valve ball valve ball is elastic. Ball and seat sealing adopts metal materials, sealing pressure is very big, relying on the pressure of the medium itself already could not reach the requirements of sealing, must exert external forces. This kind of welding ball valves are suitable for high temperature and high pressure medium. Elastic ball is on the lower end of the sphere wall open one elastic slot, and elasticity. When close the channel, sphere rolling out with stem wedge-shaped head pressure to seal with the valve seat. Wedge head before you turn the sphere are released, the sphere then restore the original prototype, appear very small gap between the sphere and valve seat, can reduce the sealing surface friction and operating torque. 4, Qv347, Qv647, Qv947V regulating ball valve
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