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Ball valve can be divided according to the structure:
First, the sphere of the forged steel fixed ball valve is fixed and does not move after being pressed. The fixed ball ball valve has a floating valve seat. After the medium pressure, the valve seat moves and the seal ring is pressed against the ball to ensure the seal. Bearings are usually mounted on the upper and lower shafts of the ball, and the operating torque is small, 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 seal ball valves have appeared in recent years. Special lubricants are injected between the sealing surfaces to form a layer of oil film, which enhances the sealing performance and reduces the operating torque. , It is more suitable for high pressure and large diameter ball valve.
Second, the elastic ball ball valve ball is elastic. The ball body and the valve seat seal ring are made of metal materials, and the specific pressure of the seal is large. The pressure of the medium itself cannot meet the requirements of the seal, and an external force must be applied. This valve is suitable for high temperature and high pressure media. The elastic ball is to open a flexible groove at the lower end of the inner wall of the ball to obtain elasticity. When closing the channel, use the wedge head of the valve stem to make the ball expand and seal with the valve seat. Loosen the wedge head before turning the ball, 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.
Ball valve according to its position can be divided into straight-through, three-style and right angle. Three-way and four-sealing ball valves are used to distribute media and change the flow of media.
3. The ball of the hard-seal floating ball valve is floating. Under the effect of medium pressure, the ball can generate a certain displacement and press on the sealing surface of the outlet end to ensure the sealing of the outlet end.
The structure of the floating ball valve is simple and the sealing is good. However, the load of the ball bearing the working medium is transmitted to the outlet sealing ring. Therefore, 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 low and medium pressure ball valves. Ball valves are widely used in irrigation systems and are mainly used at the inlet of branch pipes. The ball valve is simple in structure, small in size, and has low resistance to water flow. The disadvantage is that opening or closing is too fast and water hammer can be generated in the pipe (the pressure will increase when the water flow velocity in the pipe suddenly changes). Therefore, ball valves should not be used on trunk pipes, and they can be used for flushing on dry pipes, branch pipes or their ends. The effect of flushing sewage is good.
The ball valve has the O ball valve and the V ball valve. The O-ball valve adopts a floating structure. The ball core is a precision casting. The surface is plated with hard chrome. The valve seat is made of reinforced PTFE. The flow passage is the same as the diameter of the pipeline. The circulation capacity is extremely high and the flow resistance is extremely small. Leakage, generally used as a switch valve, is particularly suitable for high viscosity, fiber, granular media; V-ball valve with a fixed structure, the ball core open V-shaped incision, can achieve proportional control, flow characteristics are approximately equal percentages.
According to different process equipment, it can be composed of high pressure internal thread ball valve and forged steel three-piece hard seal ball valve, in which high pressure internal thread ball valve to achieve proportional adjustment must be equipped with valve positioner, forging steel three-piece hard seal ball valve to achieve proportional adjustment Electronic electric actuators or servo amplifiers must be selected.
Externally threaded ball valve ball valve is used to open and close the ball with a circular channel, the ball with the valve stem to achieve the valve opening and closing action. The opening and closing of the ball valve on the externally threaded ball valve is a holed sphere that rotates about an axis perpendicular to the channel to achieve the purpose of opening and closing the channel. Ball valves are mainly used to open and close pipes and equipment media. (Reducing the resistance when opening and closing the pipe can reduce the use time.)
O type ball there are more fixed structure <br> <br> described using more ball core forgings:
The ball valve is evolved from a plug. Its opening and closing element acts as a sphere. The ball is rotated 90° around the axis of the valve stem to open and close. The ball valve is mainly used for cutting off, distributing and changing the flow direction of the medium on the pipeline.
Ball valves designed for V-shaped openings also have good flow regulation. The ball valve not only has a simple structure and good sealing performance, but also has a small volume, light weight, low material consumption, small installation size, small drive torque, easy operation, and easy opening and closing in a certain nominal pass range. The ball valve is One of the fastest growing valve types in the last decade. Especially in industrialized countries such as the United States, Germany, France, Italy, the West and the United Kingdom, the use of ball valves is very extensive. The variety and quantity of use are still expanding, and they are also used for high temperature, high pressure, large mouth, high sealing, long life, etc. Excellent regulation performance and development of a multi-purpose valve, its reliability and other performance indicators have reached a higher level, and has partially replaced the gate valve, cut-off valve, throttle valve. With the technical progress of the ball valve, it will be more widely used in the foreseeable short time, especially on oil and gas pipelines, refinery crackers and the nuclear industry. In addition, ball valves will also become one of the leading valve types in large and medium-sized calibers and medium and low pressure fields in other industries.
This article is made up of Shanghai Wuyue ball valve: share knowledge, exchange experiences and learn from each other! This article is for reference. To learn more about ball valves, you can call Shanghai Wuyue Pump & Valve Manufacturing Co., Ltd.
What is a ball valve? How does each type of ball valve work?
Easy to operate, fast opening and closing, as long as the rotation from 90 degrees from full open to fully closed, easy remote control. Easy maintenance, ball valve structure is simple, the seal ring is generally active, removal and replacement are more convenient. Simple structure, small size, light weight. It is compact and reliable. At present, the sealing surface material of the ball valve is widely used with plastics and has good sealing performance. It has also been widely used in vacuum systems. When fully open or fully closed, the sealing surfaces of the ball body and the valve seat are isolated from the medium. When the medium passes through, the sealing surface of the valve will not be eroded. Ball valve has been widely used in petroleum, chemical, power generation, paper, atomic energy, aviation, rockets and other departments, as well as people's daily lives.