history

Ball valves were introduced in the 1950s, along withWith the rapid development of science and technology, continuous improvement of production processes and product structures, in just 40 years, it has rapidly developed into a major type of valve. In industrialized Western countries, the use of ball valves is increasing year by year.

In China, ball valves are widely used in industries such as petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electricity, municipal engineering, and steel, and play a pivotal role in the national economy. It has a 90 degree rotation motion, and the plug body is a sphere with a circular through-hole or channel passing through its axis.

Ball valves are mainly used in pipelines to cut off, distribute, and change the flow direction of media. They only require a 90 degree rotation and a small rotational torque to close tightly. The ball valve is suitable for use as a switch or shut-off valve, and is a V-shaped ball valve. In addition to paying attention to pipeline parameters, special attention should also be paid to the environmental conditions in which electric valves are used. As the electric device in electric valves is an electromechanical equipment, its usage status is greatly affected by its usage environment. Under normal circumstances, special attention should be paid to the use of electric ball valves and butterfly valves in the following environments.

Feature Editor

One; wear-resisting; Due to the fact that the valve core of the hard sealed ball valve is made of alloy steel spray welded,

three-piece ball valve

The sealing ring is made of alloy steel overlay, so the hard sealed ball valve will not experience significant wear during opening and closing. (Its hardness coefficient is 65-70):

Two; Good sealing performance; Due to the fact that the sealing of the hard sealed ball valve is manually ground until the valve core matches the sealing ring *, it can only be used. So his sealing performance is reliable.

Three; Light switch; Due to the use of a spring at the bottom of the sealing ring of the hard sealed ball valve to tightly hold the sealing ring and valve core together, the switch is very light when external forces exceed the pre tightening force of the spring.

Four; Long service life: It has been widely used in various sectors such as petroleum, chemical, power generation, papermaking, atomic energy, as well as in people's daily lives.

Pneumatic ball valves have a compact structure, reliable sealing, simple structure, and easy maintenance. The sealing surface and spherical surface are often in a closed state, which is not easily eroded by the medium and is easy to operate and maintain. They are suitable for general working media such as water, solvents, acids, and natural gas. They are mainly used to cut off or connect media in pipelines, and can also be used for fluid regulation and control.

Compared with other types of valves, pneumatic ball valves have the following advantages: angular stroke output torque, quick and stable opening, wide applicability, etc.

1. The thrust bearing reduces the friction torque of the valve stem, which can make the valve stem operate smoothly and flexibly for a long time.

2. Anti static function: Install springs between the ball, valve stem, and valve body to dissipate static electricity generated during the switching process.

3. Due to the good self-lubricating properties of materials such as polytetrafluoroethylene, the friction loss with the ball is small, resulting in a long service life for pneumatic ball valves.

4. Low fluid resistance: Pneumatic ball valves have the lowest fluid resistance among all valve classifications, even for reduced diameter pneumatic ball valves, their fluid resistance is quite small.

5. Reliable valve stem sealing: Due to the valve stem only rotating and not lifting, the packing seal of the valve stem is not easily damaged, and the sealing ability increases with the increase of medium pressure.

6. Good sealing performance of valve seat: The sealing ring made of elastic materials such as polytetrafluoroethylene is easy to seal, and the sealing ability of pneumatic ball valves increases with the increase of medium pressure.

advantage

1. The fluid resistance is small, and full bore ball valves have almost no flow resistance.

2. Simple structure, small size, and light weight.

3. Tight and reliable. It has two sealing surfaces, and the sealing surface material of the ball valve is widely used with various plastics, which has good sealing performance and can achieve * sealing. It has also been widely used in vacuum systems.

4. Easy to operate, quick opening and closing,

High performance ball valve

From fully open to fully closed, simply rotate 90 degrees for easy remote control.

5. Easy maintenance, simple ball valve structure, and generally movable sealing rings make disassembly and replacement relatively convenient.

When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium, and when the medium passes through, 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 used from high vacuum to high pressure.

Due to the wiping property of ball valves during opening and closing, they can be used in media with suspended solid particles.

High processing accuracy, expensive cost, not suitable for use at high temperatures. If there are impurities in the pipeline, it is easy to be blocked by impurities, causing the valve to fail to open.

structure

The sealing performance is good, but the load of the working medium borne by the sphere is all transmitted to the outlet sealing ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of the sphere medium. When subjected to high pressure impact, the sphere may deviate. This structure is generally used for medium and low pressure ball valves.

Valve fixed ball valve

The ball of a ball valve is fixed and does not move under pressure. Fixed ball valves are equipped with floating seats, which move when subjected to medium pressure, causing the sealing ring to press tightly against the ball to ensure sealing. Usually, bearings are installed on the upper and lower shafts of the sphere, with a small operating torque, suitable for high-pressure and large-diameter valves.

In order to reduce the operating torque of ball valves and increase the reliability of sealing, oil sealed ball valves have emerged. They inject special lubricating oil between the sealing surfaces to form a layer of oil film, which enhances sealing performance and reduces operating torque, making them more suitable for high-pressure and large-diameter ball valves.

advantage：

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

2. Simple structure, small size, and light weight.

3. Tight and reliable, the sealing surface material of the ball valve is widely made of plastic, with good sealing performance, and has also been widely used in vacuum systems.

4. Easy to operate, quick opening and closing, only need to rotate 90 ° from fully open to fully closed, making it convenient for remote control.

5. Easy maintenance, simple ball valve structure, and generally movable sealing rings make disassembly and replacement relatively convenient.

6. Wide applicability, with diameters ranging from a few millimeters to several meters, suitable for high vacuum or high pressure applications.

High pressure ball valves commonly used in mines

This type of valve is a commonly used high-pressure ball valve in existing mines. It can withstand high pressure and adopts a U-shaped quick connect method. It can be quickly installed and disassembled in daily production and use in mines, making it convenient to use.