Working principle of three-piece welded ball valve

The working principle of the ball valve is to rotate the valve stem to open or block the valve. Ball valves are light on and off, small in size, can be made into large diameters, have reliable sealing, simple structure, and easy maintenance. The sealing surface and spherical surface are always in a closed state and are not easily eroded by the medium. They are widely used in various industries.

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

The three-piece ball valve only needs to be rotated 90 degrees and a small rotational torque to close tightly. The completely equal valve body cavity provides a straight flow path with little resistance for the medium. It is generally believed that the ball valve is most suitable for direct opening and closing. Development has designed the ball valve to have the function of throttling and controlling flow. The main feature of the ball valve is that it has a compact structure and is easy to operate and maintain. It is suitable for general working media such as water, solvents, acids and natural gas, and is also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be integral or combined.

The three-piece ball valve is a relatively new type of ball valve. It has some unique advantages due to its own structure, such as no friction in the switch, the seal is not easy to wear, and the opening and closing torque is small. This allows the size of the actuator to be used reduced. Equipped with a multi-turn electric actuator, the medium can be adjusted and tightly cut off. It is widely used in petroleum, chemical industry, urban water supply and drainage and other working conditions that require strict cutting.

1. Precautions for three-piece ball valve:

1. Leave a position for the valve handle to rotate.

2. Cannot be used for throttling.

3. Ball valves with transmission mechanisms should be installed upright.

2. Working principle of three-piece ball valve:

It relies on the rotating valve to open or block the valve. Ball valves are light on and off, small in size, can be made into large diameters, have reliable sealing, simple structure, and easy maintenance. The sealing surface and spherical surface are always in a closed state and are not easily eroded by the medium. They are widely used in various industries. This type of valve should generally be installed horizontally in pipelines.

3. Advantages of three-piece ball valve:

1. The fluid resistance is small, and its resistance coefficient is equal to that of a pipe section of the same length.

2. Simple structure, small size and light weight.

3. Tight and reliable. At present, plastic is widely used as the sealing surface material of ball valves, which has good sealing performance and has also been widely used in vacuum systems.

4. Easy to operate, quick to open and close, just rotate 90° from fully open to fully closed, convenient for long-distance control.

5. It is easy to maintain. The ball valve has a simple structure and the sealing rings are generally movable, making it easy to disassemble and replace.

6. When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium. When the medium passes, it will not cause erosion of the valve sealing surface.

 

7. It has a wide range of applications, with diameters ranging from a few millimeters to several meters, and can be applied from high vacuum to high pressure. When the ball rotates 90 degrees, it should all present a spherical surface at the inlet and outlet, thus cutting off the flow.

The three-piece ball valve is a relatively new type of ball valve. It has some advantages of its own structure, such as no friction in the switch, the seal is not easy to wear, and the opening and closing torque is small. This allows the size of the actuator to be used reduced. It is widely used in petroleum, chemical industry, urban water supply and drainage and other working conditions that require strict cutting.