The structure and principle of the globe valve, the working principle of the globe valve is:

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among 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, Chaoda, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, 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 valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The globe valve is a tool that relies on the pressure of the valve bar to make the sealing surface of the valve disc and the sealing surface of the valve seat tightly fit and prevent the flow of the medium. According to the channel direction, the globe valve is divided into four types: straight-through globe valve, direct flow globe valve, angle globe valve, and plunger globe valve.

The globe valve, also known as the cut-off door, is one of the most widely used valves, and the reason why it is widely popular is that the friction between the sealing surfaces in the opening and closing process is small, relatively durable, the opening height is not large, the manufacturing is easy, and the maintenance is convenient, not only suitable for medium and low pressure, but also suitable for high pressure. The closing principle of the globe valve is to rely on the pressure of the valve stem to make the sealing surface of the disc and the sealing surface of the valve seat fit tightly to prevent the flow of medium. China's valve "three to give" has stipulated that the flow direction of the globe valve is all top-down, so there is directionality when installing.

The structure length of the globe valve is greater than that of the gate valve, and the fluid resistance is large, and the sealing reliability is not strong during long-term operation.

As one of the most important shut-off valves, globe valves play an important role in the aerospace field. As an important component of aerospace equipment, the globe valve realizes the functions of medium transportation, cut-off and regulation, and its sealing performance directly affects the safe and reliable operation of aerospace equipment. The influencing factors and influencing rules of typical globe valve sealing characteristics are studied, which has guiding significance for the structural design of valve sealing pairs, so as to improve the sealing performance and reliability of valves.

The working principle and characteristics of the globe valve.

The valve plays an important role in cutting off and throttling the medium in the pipeline where it is located, and the globe valve is an extremely important cut-off valve, and its sealing is by applying torque to the valve stem, and the valve stem exerts pressure to the valve disc in the axial direction, so that the sealing surface of the valve disc and the sealing surface of the valve seat are tightly fitted, and the medium is prevented from leaking along the gap between the sealing surfaces.

The sealing pair of the globe valve is composed of the sealing surface of the disc and the sealing surface of the valve seat, and the valve stem drives the disc to move vertically along the center line of the valve seat. In the process of opening and closing the globe valve, the opening height is small, easy to adjust the flow rate, and the manufacturing and maintenance are convenient, and the pressure is widely applicable.

Compared with another commonly used cut-off valve in industrial production, the alarm valve, in terms of structure, the globe valve is simpler than the former, which is convenient for manufacturing and maintenance. In terms of service life, the sealing surface of the globe valve is not easy to wear and abrasion, and there is no relative sliding between the valve disc and the seat sealing surface in the process of valve opening and closing, so the wear and abrasion of the sealing surface is smaller, so the service life of the sealing pair is improved, and the valve disc stroke is small in the fully closed process, and its height is smaller than that of the alarm valve. The disadvantage of the globe valve is that the opening and closing torque is large and it is difficult to realize the rapid opening and closing, because the flow channel in the valve body is relatively tortuous, and the fluid flow resistance is large, resulting in a large loss of fluid power in the pipeline.

What are the structures and characteristics of globe valves?

Imported national standard globe valve (stop valve, globe valve) is also called cut-off door, using the national standard standard, its opening and closing parts are plug-shaped valve discs, sealing the top is a plane or sea cone surface, and the valve disc moves in a straight line along the center line of the valve seat to realize the opening and closing of the valve. The movement form of the valve stem, (common name: dark rod), there are also lifting and rotating rod types, which can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.

The stem axis of the globe valve is perpendicular to the seat sealing face. The stem opening or closing stroke is relatively short.

Once the valve disc of the globe valve is in the open state, between its valve seat and the sealing surface of the valve disc, it is no longer in contact, so the mechanical wear of its sealing surface is small, because the valve seat and disc of most of the globe valve are relatively easy to repair, and when the sealing element is replaced, there is no need to remove the entire valve from the pipeline, which is very suitable for the occasion that the valve and the pipeline are welded into one. These features make shut-off valves ideal for use as a shut-off or adjustment and throttling of media.

When the medium passes through such valves, the flow direction changes. Therefore, the flow resistance of the globe valve is higher than that of other valves.

According to the characteristics of the globe valve, the characteristics and advantages of the globe valve (according to the VTON globe valve as an example) are summarized.

Advantages: 1. In the process of opening and closing, the friction between the valve disc and the sealing surface of the valve body is smaller than that of the gate valve, so it is wear-resistant.

2. The opening height is generally only 1 4 of the valve seat channel, so it is much smaller than the gate valve;

3. Usually there is only one sealing surface on the valve body and valve disc, so the manufacturing process is relatively good and easy to maintain.

4. Because its filler is generally a mixture of asbestos and graphite, the temperature resistance level is high. Generally, steam valves use globe valves.

5. Double sealing design (bellows + packing) If the bellows fails, the stem packing will also be avoided;

6. External leakage, and in line with international sealing standards;

7. No fluid loss, reduce energy loss, and improve the safety of plant equipment;

8. Long service life, reduce the number of maintenance and reduce operating costs;

9. The sturdy and durable bellows sealing design ensures zero leakage of the valve stem and provides maintenance-free conditions.

10. The bellows seal globe valve adopts the design of bellows seal, which completely eliminates the shortcomings of the aging and easy leakage of the ordinary valve stem packing seal, which not only improves the energy efficiency, increases the safety of production equipment, reduces maintenance costs and frequent maintenance, but also provides a clean and safe working environment.

Shut-off valves, which are used to turn on or off the medium. When opening or closing, the valve disc moves up and down along the center line of the valve seat, and the medium enters under the valve seat and exits after passing through the valve disc, which is usually called "low in and high out", so the arrow of the medium flow direction is marked on the valve body, and the medium flow direction should be paid attention to when used, and it cannot be reversed. Packing seals are usually used, and the gland nut can be screwed to further form a tight fit with the valve stem, and the packing can be squeezed or replaced to solve the problem.

During the opening and closing process of the globe valve, the disc and the valve seat do not want to slide together, so the wear of the sealing surface is light and the service life is long. The nominal diameter of the globe valve is 16 200mm, the nominal pressure range is 550 °C. Commonly used internal thread and flange connection.

The globe valve is a particularly common shut-off valve, which is mainly used to connect or cut off the medium in the pipeline, and is generally not used to regulate the flow.

Structural principle of globe valve:

1. The center of the inlet and outlet of the globe valve is located on the same straight line, and the fluid flow branch is like an S-shaped sphere, so it is also called a spherical globe valve;

2. When the valve seat of the valve stem is pressed down towards the bottom sealing surface, the medium stops flowing, and when the valve stem rises, the medium passes through the flow channel from below to the top.

When the globe valve is installed, there are general direction requirements, and the flow direction of the medium in the pipeline generally flows through the valve seat port from bottom to top, which is often called the so-called low in and high out, so that the purpose of this is to reduce the fluid resistance, so that the valve stem and packing culvert part are not in contact with the medium in the open and closed state, so as to ensure that the valve stem and packing culvert are not damaged and leaked.