Cast steel ball valve encyclopedia [Summary]

brief introduction

Cast steel ball valve was introduced in the 1950s. With the rapid development of science and technology, continuous improvement of production technology and product structure, it has rapidly developed into a major valve in a short period of 40 years. In the developed Western industry, the use of ball valves is increasing year by year. In China, ball valves are widely used in petroleum refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electricity, municipal, steel and other industries. The economy occupies a pivotal position. The ball valve only needs to be rotated tightly with a 90 degree rotation and a small torque. The completely equal valve body cavity provides a small, straight flow path for the medium. Ball valves are generally considered to be suitable for direct opening and closing use, but recent developments have designed the ball valve to be used for throttling and controlling flow. The main characteristics of the ball valve are its compact structure, easy operation and maintenance, suitable for general working media such as water, solvent, acid and natural gas, and also suitable for working medium with poor working conditions such as oxygen peroxide, methane and ethylene. The ball valve body can be integral or modular.

working principle

The working principle of the ball valve is to rely on the rotary valve to make the valve open or blocked. Ball valve switch is light, small size, can be made of a large diameter, reliable sealing, simple structure, easy maintenance, sealing surface and spherical surface often in the closed state, not easily eroded by the media, widely used in various industries.

Ball valve and plug valve are the same type of valve, only its closing part is a ball, the ball rotates around the center line of the valve body to open and close a valve.

Practical effect

The ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium. Ball valve is a new valve that has been widely used in recent years. It has the following advantages:

1. The fluid resistance is small, and its drag coefficient is equal to the length of the same length.

2. Simple structure, small size, light weight.

3. 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.

4. Easy to operate, fast opening and closing, as long as the rotation from 90 degrees from full open to fully closed, easy remote control.

5. Easy maintenance, ball valve structure is simple, the seal ring is generally active, removal and replacement are more convenient.

6. 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.

7. Wide range of applications, from small to several millimeters in diameter, up to a few meters in size, from high vacuum to high pressure can be applied.

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.