The Structure Of Ball Valve
Nov 22, 2017
In order to successfully automate the process, the most important thing is to ensure that the valve itself can meet the process and the special requirements of the medium within the pipeline. Usually the production process and process media can determine the type of valve, the type of spool and trim and valve structure and materials.
After the valve is selected, it is necessary to consider the requirements of the automation. The actuator can be considered simply by two basic valve operating types.
Rotary valve (single rotary valve)
Such valves include: plug valves, ball valves, butterfly valves and damper or baffle. This type of valve requires the required torque to carry out the 90 degree rotation operation of the actuator.
Valve ball valve is the most widely used, the ball valve it has a rotation of 90 degrees of action, the plug body for the ball, a circular through hole or channel through its axis. Ball valve in the pipeline is mainly used to do the interception, distribution and change the direction of the media, it only needs to rotate 90 degrees of operation and a small rolling torque can be closed tight. Ball valve is most suitable for switching, plug valve use. Check valve
Ball valve from the raw material can be divided into: carbon steel ball valve, stainless steel 304 ball valve, 316 ball valve and copper ball valve and cast iron ball valve. Widely used in petroleum, chemical, power generation and other departments, is based on stainless steel as raw materials, stainless steel ball valve products with strong anti-corrosion characteristics, simple structure, tight and reliable features.
Ball valve seven advantages
1. the fluid resistance is small, the resistance coefficient and the same length of the pipe section flat;
2. simple structure, small size, and light weight;
3. tight and reliable, and now the ball valve sealing surface information widely used plastic, good sealing, in the vacuum system has also been widely used;
4. easy to operate, open and close, from full open to full clearance only need to rotate 90 °, easy to remote control;
5. easy to repair, ball valve structure is simple, the seals are usually active, open replacement are more convenient;
6. in full open or fully closed, the ball and the seat of the sealing surface and the media isolation, the media through the period, will not lead to erosion of the valve sealing surface;
7. ball valve for a wide range of small diameter from a few millimeters, large to 1.2 meters, from high vacuum to high pressure can be applied.