Where are gate valves, globe valves, butterfly valves, and ball valves used?

All belong to the shut-off type of valves, and the gate cut-off is widely used, and it can be seen in the places where the valves are generally used! The globe valve is generally limited by caliber, and the globe valve is generally not used if it is greater than DN300, and the ball valve is generally used for coal chemical industry and natural gas! PTFE seal is the main one, and the use temperature is higher than 150 degrees Celsius to choose hard seal!

Butterfly valves are generally used in water pipelines, and the sealing performance and life are not as good as the first three! However, the size is small, the cost is low, and the pipes with large diameter and low pressure are generally used!

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 are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, 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.

Gate valves and globe valves are the two most common types of shut-off valves. In terms of appearance, gate valves are shorter and taller than globe valves, especially open rod valves require higher height space. The sealing surface of the gate valve has a certain self-sealing ability, and its valve core is tightly in contact with the sealing surface of the valve seat by the medium pressure to achieve tightness and no leakage.

The spool inclination of the wedge gate valve is generally 3 6 degrees, and the spool is easy to get stuck when the forced closing is excessive or the temperature changes greatly. Therefore, the high-temperature and high-pressure wedge-shaped gate valve has taken certain measures to prevent the valve core from jamming in the structure. When the gate valve is opened and closed, the valve core and the sealing surface of the valve seat are always in contact and rub against each other, so the sealing surface is easy to wear, especially when the valve is close to the closed state, the pressure difference between the front and rear of the valve core is very large, and the wear of the sealing surface is more serious.

Compared with the globe valve, the main advantage of the gate valve is that the fluid flow resistance is small, the flow resistance coefficient of the ordinary gate valve is about, and the resistance coefficient of the ordinary globe valve is about. The opening and closing force is small, and the medium can flow in both directions. The disadvantage is that the structure is complex, the height size is large, and the sealing surface is easy to wear.

The sealing surface of the globe valve must be closed by forced force to achieve the seal, and the driving torque of the globe valve is several times that of the gate valve under the same caliber, working pressure and the same driving device. This point should be paid attention to when adjusting the torque control mechanism of the electric valve.

The sealing surfaces of the globe valve are in contact with each other only when they are completely closed, and the relative slippage between the spool and the sealing surface of the forced closure is very small, so the wear of the sealing surface is also very small. The wear of the sealing surface of the globe valve is mostly caused by the debris in front of the valve core and the sealing surface, or due to the imtightness of the closed state, which causes the high-speed erosion of the medium.

When the shut-off valve is installed, the medium can enter from the bottom of the spool and from above. The advantage of the medium entering from the bottom of the valve core is that the packing is not under pressure when the valve is closed, which can prolong the service life of the packing, and can replace the packing when the pipe in front of the valve is under pressure. The disadvantage of the medium entering from the bottom of the valve core is that the driving torque of the valve is large, about times that of the upper entry, the axial force of the valve stem is large, and the valve stem is easy to bend.

For this reason, the medium enters from below, which is generally only suitable for small-caliber manual shut-off valves, and the force of the medium acting on the valve core when the valve is closed is not more than 350kg. The electric shut-off valve generally adopts the way that the medium enters from above. The disadvantage of the way the medium enters from above is the opposite of the way it enters from below.

Compared with gate valves, the advantages of globe valves are simple structure, good sealing performance, and convenient manufacturing and maintenance; The disadvantage is that the liquid resistance is high, and the opening and closing forces are high. Gate valves and globe valves belong to fully open and fully closed valves, which are used for shut-off or connecting the medium, and should not be used as regulating valves.

The range of applications for globe and gate valves is determined by their characteristics. In smaller channels, when good shut-off tightness is required, shut-off valves are mostly used; In steam pipelines and large-diameter water supply pipelines, gate valves are used because the fluid resistance is generally small.

Ball valves Ball valves are evolved from plug valves. It has the same rotational 90-degree lifting action, except that the body is a sphere with a circular through hole or channel through its axis. The ratio of the spherical surface to the channel mouth should be such that when the ball is rotated 90 degrees, the sphere should be presented at the inlet and outlet, thus cutting off the flow.

The ball valve only needs to be rotated 90 degrees and the torque is small to close tightly. The completely equal body cavity provides a straight-through flow path with minimal resistance to the medium. Ball valves are generally considered to be most suitable for direct opening and closing, but recent developments have designed ball valves to throttle and control flow.

The main feature of the ball valve is that it is compact in its own structure, easy to operate and maintain, and is suitable for general working media such as water, solvents, acids and natural gas, but also for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be monolithic or combined.

Globe ValvesThe stem axis of the globe valve is perpendicular to the sealing surface of the seat. The relatively short opening or closing stroke of the stem and the very reliable shut-off action make this valve ideal for use as a shut-off or adjustment and throttling of the medium. Once the disc of the globe valve is opened, there is no longer any contact between the seat and the sealing surface of the disc, and it has a very reliable shut-off action, which is very suitable for the use of shut-off or adjustment and throttling of the medium.

Once the globe valve is in the open state, there is no longer contact between its valve seat and the sealing surface of the valve disc, so the mechanical wear of its sealing surface is small, because the valve seat and disc of most of the globe valves are relatively easy to repair or replace the sealing elements without removing the entire valve from the pipeline, which is very suitable for the occasion that the valve and the pipeline are welded into one. The flow direction of the medium through these valves changes, so the flow resistance of the globe valve is higher than that of other valves.

The gate valve is used as a shut-off medium, and the entire flow is straight through when fully opened, and the pressure loss of the medium operation is minimal. Gate valves are usually suitable for applications where the gate does not need to be opened and closed as often as possible, and the ram is kept fully open or closed. Not intended for use as conditioning or throttling.

For high-speed flowing media, the ram can cause the vibration of the gate when it is partially opened, and the vibration may damage the sealing surface of the ram and the valve seat, and the throttling will cause the ram to suffer from the erosion of the medium. In terms of structural form, the main difference is the form of the sealing element used. Depending on the form of the sealing element, gate valves are often divided into several different types, such as:

Wedge gate valves, parallel gate valves, parallel double gate valves, wedge double gate gates, etc. The most commonly used forms are wedge gate valves and parallel gate valves. :

This question may have two meanings: First, what industry are these pipe fittings used in? The second is the use and use of globe valves, ball valves, and check valves.

First of all, these pipe fittings are used in pipeline engineering, that is, wherever gases, liquids, or gases and liquids need to be used as power. Therefore, it is needed in almost all industries (engineering), especially in chemical enterprises, water supply, and hydraulic systems.

The most important parameters of pipe fittings (valves) are the pressure, the nominal diameter of the pipeline, the medium used, the temperature, and the material of the spool and valve body. There are many types of valves, and the most commonly used ones are globe valves, gate valves, ball valves, ......As the name suggests, the check valve (many forms) is to prevent the fluid from reversing, such as the pump outlet needs to be installed to prevent the fluid from reversing when the pump stops, therefore, the check valve needs to be installed where the fluid is not allowed to flow back in the process. The globe valve is mainly used where the fluid needs to be cut off, it has good tightness (not easy to leak), but the resistance is large.

The ball valve, the valve core is a ball body, the structure is simple, the switch is convenient, but its adjustment and pressure resistance are poor, so it is often used on water pipes with small diameter. If you need to know more about it, please refer to the valve selection manual, if necessary, please provide QQ email to send you e-books.

Shut-off valves are widely used, but they have large head losses and are not easy to clean, so they are not suitable for easily clogged fluids or viscous fluids. The ball valve has a small pressure head loss and is suitable for more viscous fluids, but the practical application is also very wide, but it is slightly higher. As the name suggests, the check valve prevents the fluid from flowing backwards, allowing the fluid to be delivered in one direction, and if it is in the opposite direction, it is immediately shut off.

The globe valve is generally used at the water inlet of the pipe network, and the ball valve is generally used at the water outlet of the pipe network, which is convenient for switching.

Check valves are suitable for water supply pipe networks in high-rise buildings, pipe networks with certain chemical corrosive media, pipe networks with limited installation space, and sewage pipe networks.

Where there are pipes, there are these.

Gate valves, globe valves, and ball valves all belong to the category of shut-off valves, and their function is to connect or cut off the rising medium in the pipeline.

Check valves, also known as check valves or check valves, are used to prevent the reverse flow of the medium in the old and slammed into the slip and stop pipeline.