What Is a Flanged Ball Valve?

Ball valve and gate valve are the same type of valve. The difference is that the closing part is a ball. The ball rotates around the center line of the valve body to open and close the valve. Ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium. Flange ball valve standard GB / T21465-2008 "valve term" is defined as: the valve is driven by the valve stem (ball) and rotates around the axis of the valve stem.

Ball valve and gate valve are the same type of valve. The difference is that the closing part is a ball. The ball rotates around the center line of the valve body to open and close the valve. Ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium. Flange ball valve standard GB / T21465-2008 "valve term" is defined as: the valve is driven by the valve stem (ball) and rotates around the axis of the valve stem.

Ball valve is a new type of valve widely used, which has the following advantages:

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

2. Simple structure, small size and light weight.

3. It is tight and reliable. The sealing material of the ball valve is widely used in plastic, which has good sealing performance and has been widely used in vacuum systems.

4.Easy operation, fast opening and closing, only need to rotate 90 ° from fully open to fully closed, which is convenient for remote control.

5. Easy maintenance, simple structure of ball valve, seal ring is usually movable, and it is more convenient 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, and the medium will not cause erosion of the valve sealing surface when the medium passes.

7. Wide range of application, from small diameter to several millimeters, large to several meters, from high vacuum to high pressure can be applied. This type of valve should generally be installed horizontally in the pipeline ^[1]

Ball valve installation and maintenance should pay attention to the following:

1. Keep the position where the valve handle rotates.

2. Cannot be used as throttling.

3. Ball valve with transmission mechanism should be installed upright.

1.Friction without opening and closing

This function completely solves the problem that the traditional valve affects the seal due to the friction between the sealing surfaces.

2. Jacket structure

The valve installed on the pipeline can be directly checked and repaired online, which can effectively reduce the equipment shutdown and reduce costs.

3.Single valve seat design

Eliminates the problem that the medium in the cavity of the valve affects the safety of use due to abnormal pressure rise.

4. Low torque design

The valve stem with special structure design can be easily opened and closed with only a small handwheel valve.

5. Wedge-shaped seal structure

The valve is sealed by the mechanical force provided by the valve stem, which presses the ball wedge against the valve seat, so that the sealing of the valve is not affected by the change in the pressure difference of the pipeline, and the sealing performance is reliably guaranteed under various working conditions.

6.Self-cleaning structure of sealing surface

When the sphere is tilted away from the valve seat, the fluid in the pipeline passes through the sealing surface of the sphere uniformly at 360 °, which not only eliminates the local erosion of the valve seat by the high-speed fluid, but also removes the accumulation on the sealing surface to achieve the purpose of self-cleaning. .

1. Nominal pressure or pressure level: PN1.0-32.0MPa, ANSI CLASS 150-900, JIS10-20K;

2. Nominal diameter or caliber: DN6 900, NPS 1/4 36;

3. Connection method: flange, butt welding, thread, socket welding, etc.

4. Applicable temperature: -196 540 ;

5. Drive mode: manual, worm gear, pneumatic, electric, hydraulic, pneumatic-hydraulic, electro-hydraulic;

6. Valve body material: WCB, ZG1Cr ₁₈ Ni ₉ Ti, ZG1Cr ₁₈ Ni ₁₂ Mo ₂ Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti. Different materials are used, which can be suitable for various media such as water, steam, oil, nitric acid, acetic acid, oxidizing media, urea, etc.