How to distinguish between a shut off valve and a check valve???

The icons of these valves are far from good. Very recognizable.

Check valves. Water meter, y filter, shut-off valve.

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.

The difference between a check valve and a globe valve is as follows:

Check valves do not have a screw-on handle, and globe valves have handles.

1. Check valve.

Second, the globe valve.

Extended Content:1. Check valve.

Check valve refers to the valve that automatically opens and closes the valve disc by relying on the flow of the medium itself to prevent the medium from backflowing, also known as check valve, check valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve, and its main function is to prevent the backflow of the medium, prevent the pump and the drive motor from reversing, and the discharge of the container medium.

Second, the globe valve.

The globe valve, also known as the cut-off door, is the most widely used valve, it is widely popular, because the friction between the sealing surfaces in the opening and closing process is small, relatively durable, the opening height is not large, easy to manufacture, easy to maintain, 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.

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.

Encyclopedia Check valves.

Encyclopedia Globe valves.

Machine filter refers to the airlift compass filter of the car. The check valve generally refers to the check valve of the machine filter, also known as the anti-backflow valve, which is used to prevent the air from flowing in the opposite direction when the engine is turned off, which affects the driving stability of the vehicle. As a result, some filters are fitted with a check valve, while others are not.

Here are some ways to tell if a filter has a check valve:

1.Check the manual: The manual will have information about whether there is a check valve for organic filtration.

2.Appearance judgment: the machine filter generally has an air inlet and an air outlet, if the air inlet is larger than the air outlet, it is likely that the machine filter has a check valve.

3.Shake the machine filter: shake the machine filter and listen to the sound of laughter, if you hear the ticking sound, it means that there is a check valve in the machine filter.

4.Disassemble the machine filter: disassemble the machine filter to see if there is a check valve, generally the outside of the check valve is a cylindrical small box, one end is the interface, the other end has a spring.

The difference between a check valve and a globe valve is as follows:

1.Check valves do not have a screw-on handle, and globe valves have handles.

2.The purpose of the two is different: the check valve is used to automatically stop the backflow of liquid, and the globe valve is used to cut off the liquid feed in the pipeline, manual or motorized.

3.One is an automatic valve and the other requires pressure to be applied. The globe valve, also known as the shut-off valve, is a forced sealing valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak.

Check valve refers to a kind of valve that has a circular disc opening and closing parts and relies on its own weight and medium pressure to block the backflow of the medium, which is an automatic valve.

1.The check valve is called a check valve, which is used to prevent the fluid from flowing back, and cannot be adjusted or closed. 7 y% s) c" n, l. q3 u6 j& e9 r

2.The globe valve can be used to adjust the flow rate, which can be closed and closed.

Literally can be explained, dear! Check valve, you fluid medium can come in, want to go back. No way!

Blocked. So is the stop return! This kind of valve is generally opened and closed by the medium itself.

What about globe valves. The water in your pipe is flowing well, I say stop, (if it's an electric shut-off valve) press the off button. Stop immediately.

The medium cannot be circulated. I want to open. Press On.

The stem is lifted again, and the medium can flow through! Of course, I won't tell you too much about the internal structure inside!

The globe valve has a handwheel, and the general check valve does not have an operating mechanism by gravity or spring action, but there is a large check valve.

Can be turned on and off. It is the shut-off valve, which cannot be closed and opened, and it is automatic that there is a plate in the middle that will move the check valve.

1. The working principle is different.

Globe valves, by applying torque to the stem, the stem exerts pressure to the disc in the axial direction, so that the sealing surface of the disc is closely attached to the sealing surface of the valve seat, preventing the leakage of the medium along the gap between the sealing surfaces.

The check valve refers to the opening and closing parts are round discs, and rely on their own weight and medium pressure to produce action to block the backflow of the medium.

2. The classification is different.

Globe valves are divided into straight-through globe valves, angle globe valves, direct flow globe valves, etc.

Check valves, divided according to the structure, can be divided into three types: lifting check valve, swing check valve and butterfly check valve.

1. Different properties: check valve is a kind of valve that opens and closes with a circular disc and relies on its own weight and medium pressure to block the backflow of medium. The globe valve is a forced seal valve.

2. Different shapes: the opening and closing parts of the globe valve are plug-shaped discs, and the sealing is flat or sea cone surfaces, and the valve disc moves in a straight line along the center line of the valve seat. The disc movement mode of check valve and valve is divided into lifting type and swing type.

3. Different characteristics: the structure of the globe valve is simpler than that of the gate valve, and the manufacturing and maintenance are more convenient. Check valves are not.

First, the role is different.

1. Check valve: The function of this type of valve is to only allow the medium to flow in one direction, and prevent the flow in the opposite direction.

2. Globe valve: The lifting rotary rod type 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.

Second, the working principle is different.

1. Check valve: Usually this kind of valve works automatically, and the valve disc opens under the action of fluid pressure flowing in one direction; When the fluid flows in the opposite direction, the fluid pressure and the self-closing disc of the disc act on the valve seat, thus cutting off the flow.

2. 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 closely fitted, and the medium is prevented from leaking along the gap between the sealing surfaces.

Third, the disadvantages are different.

1. Check valve: the disadvantage is that the resistance is large and the sealing is poor when closed.

2. Globe valve: the fluid resistance is large, and the force required for opening and closing is large; It is not suitable for media with particles, high viscosity and easy coking; Poor regulation performance.

The essence of the two is not the same.

Check valve refers to a kind of valve that has a circular disc opening and closing parts and relies on its own weight and medium pressure to block the backflow of medium. It is an automatic valve, also known as check valve, check valve, return valve or isolation valve. The disc movement mode is divided into lifting type and swing type.

The lift check valve is similar in structure to the globe valve, with only the stem that drives the disc missing. The medium flows in from the inlet (bottom) and out from the outlet (top). The valve is opened when the inlet pressure is greater than the sum of the disc weight and its flow resistance.

Conversely, the valve is closed when the medium flows backwards. Swing-start check valves have a tilted disc that rotates around the shaft and work similarly to a lift-lift check valve. Check valves are often used as foot valves for pumping devices to stop the backflow of water.

The check valve is used in combination with the globe valve to play the role of safety isolation. The disadvantage is that the resistance is high and the sealing is poor when closed.

Jiangsu Taigong check valve.

Globe valveGlobe valve, also known as shut-off valve, is a forced sealing valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. When the medium enters the valve from the bottom of the valve disc, the resistance that needs to be overcome by the operating force is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium, and the force of closing the valve is greater than the force of opening the valve, so the diameter of the valve stem should be larger, otherwise the failure of the top bend of the valve stem will occur. According to the connection method, it is divided into three types:

Flange connection, thread connection, welded connection. After the appearance of the self-sealing valve, the medium flow direction of the globe valve is changed from the top of the disc to enter the valve cavity, at this time, under the action of medium pressure, the force of closing the valve is small, and the force of opening the valve is large, and the diameter of the valve stem can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also tighter.

China's valve "three to give" has stipulated that the flow direction of the globe valve is all top-down. When the globe valve is opened, the opening height of the disc is 25% to 30% of the nominal diameter. The maximum flow rate has been reached, indicating that the valve has reached the fully open position.

Therefore, the fully open position of the globe valve should be determined by the stroke of the disc.

The opening and closing parts of the stop valve (globe valve) are plug-shaped discs, which are flat or sea cone surfaces on the seal, and the disc moves in a straight line along the center line of the valve seat. 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.

As a result, this type of shut-off valve valve is ideal for shut-off or regulation and throttling. This type of valve is very suitable for regulating the flow rate because the stem opening or closing stroke is relatively short, and because it has a very reliable shut-off function, and because the change of the seat port is proportional to the stroke of the disc.

Jiangsu Taigong globe valve.

The globe valve is a commonly used shut-off valve, which is mainly used to connect or cut off the medium in the pipeline, and is generally not used to adjust the flow rate The globe valve is suitable for a wide range of pressure and temperature, but it is generally used for medium and small diameter pipelines

A globe valve is a valve in which the shut-off (disc) moves along the centerline of the valve seat.

The globe valve is mainly used for shut-off in the pipeline. Globe valves have the following advantages:

1. In the process of opening and closing, the friction of the sealing surface is smaller than that of the gate valve, and it is wear-resistant.

2 Small opening height.

3 Usually there is only one sealing surface, the manufacturing process is good, and it is easy to maintain.

The use of globe valve is more common, but due to the large opening and closing torque and long structural length, the nominal diameter is generally limited to less than DN 200mm. The fluid resistance loss of the globe valve is large. This limits the wider use of shut-off valves.

A check valve is a valve that automatically stops the backflow of fluid, and the disc of the check valve opens under the action of fluid pressure, and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the disc automatically closes under the action of factors such as fluid pressure difference and its own gravity to prevent the fluid from backflowing.

Check valves are this type of valve that allows the flow of media in only one direction and prevents it from flowing in one direction. Usually this kind of valve works automatically, and the disc opens under the action of fluid pressure flowing in one direction; When the fluid flows in the opposite direction, the fluid pressure and the self-closing disc of the disc act on the valve seat, thus cutting off the flow. Among them, check valves belong to this type of valve, which includes swing check valves and lifting check valves.

The swing check valve has a medium hinge mechanism and a door-like disc resting freely against the sloping seat surface.

I'm not familiar with the selection.

A check valve is used to automatically stop the backflow of liquid, and a shut-off valve is a manual or motorized valve used to cut off the liquid feed in the pipeline.

Check valves and globe valves are not the same thing, and the difference between the two is mainly that the construction is very different.

The check valve, which is a one-way valve, automatically prevents the reverse flow of fluid, has no knob, and cannot artificially block the positive flow.

The globe valve, with knob, can artificially control the forward flow, due to its special structure, even if there is no artificial pipe valve, the fluid cannot flow in the opposite direction.