Where are ball valves suitable? What are the advantages and disadvantages of ball valves and what is

Since ball valves typically use rubber, nylon, and PTFE as seat ring materials, its operating temperature is limited by the seat seal material. The shut-off effect of the ball valve is accomplished by the metal ball pressing against each other between the plastic valve seats under the action of the medium (floating ball ball valve). Under the action of a certain contact pressure, the seat seal ring is elastic-plastic deformed in some areas.

This deformation can compensate for the manufacturing accuracy and surface roughness of the ball and ensure the sealing performance of the ball valve.

And because the seat seal ring of the ball valve is usually made of plastic, the fire resistance and fire resistance of the ball valve should be considered in the selection of the structure and performance of the ball valve, especially in the petroleum, chemical, metallurgical and other departments, the ball valve is used in the equipment and pipeline system of flammable and explosive media, and more attention should be paid to fire resistance and fire prevention.

In general, ball valves are recommended in pipeline systems with two-position adjustment, strict sealing performance, mud, wear, necking channel, fast opening and closing action (1 4 turns opening and closing), high pressure cut-off (large pressure difference), low noise, cavitation and gasification, a small amount of leakage to the atmosphere, small operating torque and low fluid resistance.

Ball valves are also suitable for light construction, low pressure shut-off (small differential pressure), and corrosive media in piping systems. Ball valves are also available in cryogenic (cryogenic) installations and piping systems. In the oxygen piping system of the metallurgical industry, ball valves that have undergone a strict degreasing treatment are used.

When the main lines in oil pipelines and gas pipelines need to be buried underground, full-bore welded ball valves are used. When adjustable performance is required, a ball valve with a special structure with a V-shaped opening is required. In petroleum, petrochemical, chemical, electric power, and urban construction, metal-to-metal sealed ball valves can be used for pipeline systems with working temperatures above 200 degrees.

The ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium, it only needs to rotate 90 degrees of operation and a small torque to close tightly. Ball valves are most suitable for on/off and shut-off valves.

The unique characteristics of the ball valve determine that the ball valve is very widely used, and the ball valve is recommended in the pipeline system with double position adjustment, strict sealing performance, mud, wear, necking channel, rapid opening and closing action, high pressure cut-off, low noise, cavitation, a small amount of leakage to the atmosphere, small operating torque and small fluid resistance.

The use of ball valves is very extensive, the variety and quantity of use continue to expand, its reliability and other performance indicators have reached a high level, and have partially replaced gate valves, globe valves, and regulating valves.

With the technological advancement of ball valves, there will be a wider range of applications in the foreseeable short term, especially in oil and gas pipelines, cracking units for oil refining, and in the nuclear industry.

A ball valve is a common fluid control valve that uses a rotating ball to control the opening and closing of the fluid. Ball valves have the following main functions:

1.Opening and closing the fluid channel: The main function of the ball valve is to control the flow of fluid, and by rotating the sphere, the channel can be completely opened or closed, so as to control the passage or blocking of the fluid.

2.Quick shut-off fluid: The ball valve has the ability to quickly cut off the fluid, when the ball rotates to the closed position, the valve will quickly block the flow of the fluid, thus effectively cutting off the passage of the medium.

3.Flow regulation: Ball valves usually have a hole in the ball, and the size of the opening of the hole can be adjusted by rotating the ball, so as to control the flow of fluid. Ball valves have a smaller flow adjustment range than other valve types and are typically used in applications that require higher flow rates.

4.Reliability & Tightness: The ball valve is simple in design, reliable in operation, and has good sealing performance. Ball valves usually use sealing rings, sealing surfaces and other structures to ensure the tightness of the valve, which can effectively prevent fluid leakage.

5.Corrosion resistance: Ball valves are often used in occasions with high requirements for media, such as chemical, oil, natural gas and other industries. Ball valves are typically made of corrosion-resistant materials and are able to operate stably in corrosive media for long periods of time.

It should be noted that the ball valve can not only be closed and closed to achieve two-way on-off control, but also can realize multi-channel control through special structures, such as three-way and four-way ball valves. In addition, the ball valve can also be equipped with electric, pneumatic and hydraulic actuators as needed to achieve remote control and automatic operation. <>

A ball valve is a type of valve that controls the flow or truncation of a fluid by the rotation of the ball. Its main effects include the following:

V-Ball Valve. 1.Fluid Cut-off:

The ball valve can achieve the cut-off function of the fluid by rotating the ball so that it aligns or misaligns the liquid flow channel between the ball and the valve body. When the ball is aligned with the valve body channel, the fluid can flow through the valve; When the ball rotates so that it is not aligned with the valve body channel, the valve can cut off the fluid and stop the flow of fluid.

2.Fluid regulation and control: The ball valve can realize the partial truncation or flow of the fluid by rotating the ball, so as to realize the regulation and control function of the fluid.

By rotating the angle of the sphere, different degrees of flow control can be achieved, from a completely closed to a fully open state, or a partial flow can be achieved in the middle position.

V-Ball Valve. 3.Fast fluid switching: The ball valve has the characteristics of fast switching, which can quickly realize the on/off operation of the fluid, and is suitable for occasions that need to quickly cut off the flow of fluids to avoid fluid leakage and waste.

4.High pressure resistance and high temperature resistance: Ball valves are usually suitable for high pressure and high temperature fluid media, with good pressure resistance and temperature resistance, and can work stably in high pressure and high temperature environments.

5.Good sealing: The ball valve forms a complete tight seal between the ball and the valve seat in the closed state, which has good sealing performance and can effectively prevent fluid leakage.

6.Simple structure and easy maintenance: The structure of the ball valve is relatively simple, consisting of fewer parts, and is easy to install and maintain.

In general, ball valves have a wide range of applications in the industrial field, mainly used for the cut-off, regulation and control of fluids, with fast switching characteristics, pressure resistance, temperature resistance and good sealing performance, suitable for various fluid media and process requirements.

1. In China, the use of ball dust valve is very extensive, generally used in refining, pharmaceutical, chemical, long-distance pipelines, papermaking, electric power, municipal, steel and other industries, and has a pivotal position in China's economic development. Ball valve is a widely used one of the valves, and there are many types of it, such as: three-way ball valves, flanged ball valves, fixed ball valves, and so on.

2. The ball valve is used in the medium pipeline as a function of regulating and controlling the simple return, which is generally installed horizontally in the pipeline, and has the functions of distribution, cutting off and changing the flow direction of the medium. The ball valve only needs to be rotated 90° to achieve a tight seal, and its body can be used as a whole or individually. The sealing surface of the ball valve is usually in a closed state with the spherical surface, so it is not easy to be eroded by the medium, easy to operate, simple and compact structure, and can be used in working conditions with water, natural gas, acid, solvent, etc.

Here are some well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. Although the rankings may change depending on time and market conditions, the following products are generally considered to be one of the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only the role of estimation and banquet reference, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the brand directly affect the satisfaction and trust of users.

These brands are well known in the valve industry for their innovative technology, high-quality products and reliability. It is worth noting that the market and industry are changing rapidly, and the ranking of those who are not clear may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional institutions or market research data for more detailed and accurate information.

First, the advantages and disadvantages of ball valves.

1. Advantages: It has the lowest flow resistance (actually 0);

Because it does not get stuck during operation (without lubricant), it can be reliably used in corrosive media and low-boiling liquids;

Complete sealing over a wide range of pressures and temperatures;

It can be opened and closed quickly, and the opening and closing time of some structures is only to ensure that it can be used in the automation system of the test bench. When the valve is opened and closed quickly, there is no impact in operation;

The spherical closure can be automatically positioned at the boundary position;

The working medium is sealed and reliable on both sides;

When fully open and fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, so the medium passing through the valve at high speed will not cause erosion of the sealing surface;

Compact and lightweight, it can be considered as the most reasonable valve structure for cryogenic media systems;

The symmetry of the valve body, especially the welded valve body structure, can well withstand the stress from the pipeline;

The closing part can withstand the high differential pressure when closing;

The ball valve with the all-welded valve body can be buried directly in the ground, so that the valve internals are not corroded, and the maximum service life can reach 30 years, which is the most ideal valve for oil and gas pipelines.

2. Disadvantages: Because the most important seat sealing ring material of the ball valve is PTFE, it is inert to almost all chemical substances, and has the comprehensive characteristics of small friction coefficient, stable performance, not easy aging, wide range of temperature application and excellent sealing performance. However, the physical properties of PTFE, including a high coefficient of expansion, susceptibility to cold flow, and poor thermal conductivity, require that seat seals be designed around these properties. So, when the sealing material hardens, the reliability of the seal is compromised.

Moreover, PTFE has a low temperature resistance rating and can only be used in cases less than 180. Beyond this temperature, the sealing material will deteriorate. In the case of long-term use, it will generally only be used at 120.

Its regulation performance is somewhat inferior to that of shut-off valves, especially pneumatic valves (or electric valves).

2. Scope of application:

Ball valves are used in petroleum refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electric power, municipal, steel and other industries.

Pros:1The fluid resistance is small, and its resistance coefficient is equal to that of a pipe section of the same length, and it has the lowest flow resistance (actually 0).

2.Simple structure, small size and light weight.

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

4.It is easy to operate, quick to open and close, and only needs to rotate 90° from full open to full closed, which is convenient for long-distance control.

5.It is easy to maintain, simple in structure, the sealing ring is generally movable, and it is more convenient to disassemble and replace.

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

7.It can be used in a wide range of applications, from small to a few millimeters and several meters in diameter, from high vacuum to high pressure.

Cons: 1Since the most important seat seal material for ball valves is PTFE, PTFE has a low temperature resistance rating and can only be used in cases less than 180.

Beyond this temperature, the sealing material will deteriorate. In the case of long-term use, it is better to use the ball valve in an environment where the temperature does not exceed 120.

2.Its regulation performance is somewhat inferior to that of shut-off valves, especially pneumatic valves (or electric valves).

Ball valves and gate valves are generally used for the opening and closing of fluids, and are generally not used for flow regulation, while globe valves can be used for flow adjustment in addition to the opening and closing of fluids. If you need to adjust the flow rate, it is best to use a media valve behind the meter. The ball valve is very convenient, fast and labor-saving, generally only need to turn the valve handle 90 degrees, and the ball valve can be used on less pure (containing solid particles) fluids because its spherical spool does shear motion on the fluid when opening and closing.

And the gate valve sealing surface is easy to cause erosion and abrasion, maintenance is more difficult, the overall size is larger, a certain space is required for opening, the opening and closing time is long, and the structure is more complex.

As for the ball valve you said, it is generally used for small caliber because the production of small caliber is simple, relatively cheap, and the production accuracy of the increased caliber requires high production costs, so the price is also high. Generally, small diameters are threaded connections, from G1 to 4 G2.

The ball valve has a smooth direct flow through the circular channel, and the ball valve has a compact structure, so there is little resistance to the passage of the fluid (strong flow force). The opening and closing are fast and fast, the installation is convenient, and there are many connection methods. Wide range of use. Its disadvantage is that the cost is on the high side.