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中文简体Brief introduction of ball valve: Ball valve is a valve that uses a ball with a circular channel as the opening and closing part, and the ball rotates with the valve stem to realize the opening and closing action of the valve. The opening and closing part of the ball valve is a ball with a hole, which rotates around the axis perpendicular to the channel, so as to achieve the purpose of opening and closing the channel. Ball valves are mainly used to open and close pipelines and equipment media.
The main points are: floating ball valve, fixed ball valve, chip ball valve, track ball valve, V-type ball valve, O-type ball valve, cut-off ball valve, three-way ball valve, four-way ball valve, forged steel ball valve, ash unloading ball valve, anti-sulfur ball valve, Eccentric ball valve, thermal insulation ball valve, pneumatic ball valve, electric ball valve, ferrule ball valve, fully welded ball valve
The ball valve is designed so that the spool rotates 90 degrees, and a circular through hole or channel passes through its axis. The ball valve is used to cut off, cut off, and change the flow direction of the fluid in the fluid pipeline. As long as the ball valve rotates 90 degrees, it can rotate the torque to achieve a tight seal. In recent years, the development of ball valves has changed from cut-off and cut-off to throttling and flow control.
The main advantages of the ball valve are as follows: suitable for frequent operation, quick and easy to open and close.
1. The fluid resistance is small, and the flow resistance of the full-bore ball valve is basically zero.
2. Simple structure, relatively small size, light weight, and easy maintenance.
3. Good sealing performance, not limited by the installation direction, the flow direction of the medium can be arbitrary.
4. No vibration, low noise.
5. The ball valve has a long service life. Because PTFE has good self-lubricating properties, the friction and wear with the ball is small, and due to the improvement of the ball processing technology, the roughness is reduced, thereby improving the service life of the ball valve. According to reports, the American W-K-M company has conducted life tests on ball valves in the laboratory, and the number of switches has exceeded 100,000 times.
6. The ball valve only needs to be rotated 90° from fully open to fully closed, which has the advantages of convenient operation, rapid opening and closing, and convenient remote control.
7. It has a wide range of applications, the caliber can range from a few millimeters to several meters, the pressure can reach more than 32mpa, and it is suitable to be equipped with actuators.
Since the ball valve generally only needs to turn the handle 90° to complete the fully open or fully close action, it is easy to realize rapid opening and closing. It can realize fast 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. When opening and closing the valve quickly, there is no shock in operation.
The main disadvantages of ball valves are as follows: ball valves can be divided into floating ball valves, fixed ball valves, elastic ball valves and oil-sealed ball valves according to their structure; There are two kinds of shape and L shape. According to the connection method, it can be divided into three types: threaded connection, flange connection and welding type.
