Understand the structure, characteristics, advantages and classification of ball valves

by:Lianke Valve     2022-08-05
The ball valve is an easy valve to operate, and maintenance is also very convenient. And because of its compact structure, it can be used in liquid or corrosive media or natural gas. Even some very special media, such as oxygen and the like. Its valve body can be a whole or a combination. The closing part of the ball valve is a sphere, which is a kind of valve in which the sphere rotates around the center line of the valve body to open and close. The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. Ball valve is a new type of valve that has been widely used in recent years. It has many advantages, as follows: 1. It has the lowest flow resistance (actually 0); 2. It can be used in corrosive media and low-boiling liquids because it will not get stuck during operation (when there is no lubricant). ; 3. It can achieve complete sealing in a large pressure and temperature range; 4. It can realize rapid opening and closing, and the opening and closing time of some structures is only 0.05~0.1s, so as to ensure that it can be used in the automation system of the test bench middle. When the valve is opened and closed quickly, the operation has no impact; 5. The spherical closing element can be automatically positioned at the boundary position; 6. When fully open and fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, so the medium passing through the valve at high speed It will not cause erosion of the sealing surface; 7. The structure is compact and light in weight, so it can be considered as the most reasonable valve structure for low temperature medium systems; 8. The valve body is symmetrical, especially the welded valve body structure, which can withstand well The pressure from the pipeline; 9. The closing part can withstand the high pressure difference when it is closed; 10. The ball valve with fully welded valve body can be directly buried in the ground, so that the valve internal parts are not corroded, and the maximum service life can reach 30 years. The ideal valve for oil and natural gas pipelines. According to the structure, the ball valve can be divided into: 1. Floating ball valve The ball is floating. Under the action of medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet to ensure the sealing of the outlet. The floating ball valve has a simple structure and good sealing performance, but the load of the ball bearing the working medium is all transferred to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. This structure is widely used in medium and low pressure ball valves. 2. Fixed ball valve The ball is fixed and does not move after being pressed. The fixed ball valve has a floating valve seat. After being pressurized by the medium, the valve seat moves, so that the sealing ring is tightly pressed on the ball to ensure the sealing. Bearings are usually installed on the upper and lower shafts with the ball, and the operating torque is small, which is suitable for high-pressure and large-diameter valves. In order to reduce the operating torque of the ball valve and increase the reliability of the seal, oil-sealed ball valves have appeared in recent years. Special lubricating oil is injected between the sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the operating torque. , more suitable for high-pressure and large-diameter ball valves. 3. Elastic ball valve The ball is elastic. Both the ball and the valve seat sealing ring are made of metal materials, and the sealing specific pressure is very large. The pressure of the medium itself cannot meet the sealing requirements, and external force must be applied. This valve is suitable for high temperature and high pressure medium. The elastic sphere is obtained by opening an elastic groove at the lower end of the inner wall of the sphere to obtain elasticity. When closing the channel, use the wedge head of the valve stem to expand the ball and press the valve seat to achieve sealing. Before turning the ball, loosen the wedge head, and the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction and operating torque of the sealing surface. The ball valve can be divided into: straight-through type, three-way type and right-angle type according to its channel position. The latter two ball valves are used to distribute the medium and change the flow direction of the medium. Its many characteristics make ball valves widely used in petroleum, chemical industry, power generation, papermaking, atomic energy, aviation, rockets and other sectors, as well as people's daily life. The above is what I explained to you, which profoundly and vividly explains the structural characteristics, classification, advantages and other aspects of the ball valve. It is convenient for everyone to know more and have an understanding of the ball valve. Lianke Valve Co.,Ltd. is a company dedicated to valve innovation and production, with very professional knowledge and skilled technology.
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