What is the difference between a flanged butterfly valve and a clamp butterfly valve

Clamp butterfly valves and flanged butterfly valves are the two common types of butterfly valves. The application range of the two butterfly valves is very wide, and there are many friends who can't tell the difference between the clamp butterfly valve and the flanged butterfly valve, and don't know the difference between the two.

First of all, the clamp and flange of the butterfly valve are two connection methods.

In terms of the aspect, the counter-clamp type is cheaper, and the flange is roughly 2 3. When choosing imported valves, use the clamp type as much as possible, which is cheaper. Heavy and light.

The length of the bolt of the valve door of the <> clamp type is longer, and the construction accuracy is required to be higher, if the flanges on both sides are not aligned, the bolt will be subjected to greater shear force, and the valve is easy to leak.

The clamp-on valve bolt is generally relatively long, and under high temperature conditions, the bolt may cause leakage after expansion, so it is not suitable for large pipe diameters under high temperature conditions. And for clamp-on butterfly valves - generally can not be used.

When the end of the pipeline and the downstream need to be disassembled, because when the downstream flange is removed, the clamp-type valve will fall off, and in this case, it is necessary to make a short section in order to disassemble it, while the flanged butterfly valve does not have the above problems, but the cost will be relatively high.

There are no flanges at both ends of the body of the clamp butterfly valve, only a few guide bolt holes, and the valve is connected with the flange at the end with a set of bolt nuts. In contrast, it is easier to disassemble, and the cost of the valve is lower, but the disadvantage is that there is a problem with the sealing surface, and both sealing surfaces have to be disassembled.

There are flanges at both ends of the flanged butterfly valve body, which are connected with the pipe flanges. The seal is relatively more reliable, but the valve is more expensive.

It is the difference in the installation method, the clamp butterfly valve is fixed by the long bolt of the flange on the opposite side; The flanged butterfly valve is connected with the opposite flange; The space occupied by the clamp is small;

This article classifies the connection mode of the electric butterfly valve, and introduces in detail the difference between the electric flange butterfly valve and the electric clamp butterfly valve; If you think it will help you, please raise your hand and give the American Vodon valve a thumbs up.

If the imported electric butterfly valve is divided according to the connection method, it can be divided into the imported electric clamp butterfly valve and the imported electric flange butterfly valve, so what is the difference between the two, how to choose, and analyze.

As one of the more common valves in pipelines, electric butterfly valves are used to realize the on-off of various media in the pipeline system and the control of flow size, and have been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower, etc. Electric pinch butterfly valve and electric flange butterfly valve, and these two valves have their own characteristics, and the performance is not the same, can be used in different industries.

For these two valves, in addition to the difference in structural form, if it is in the case of the same parameters, the biggest difference is that the connection method is different, that is, the installation form is different, which depends on the site conditions!

1. The difference between electric clamp butterfly valve and electric flange butterfly valve:

The thickness of the electric butterfly valve will be thinner than that of the flange butterfly valve, there is no flange at both ends of the valve body, only a few guide bolt holes, and the valve is connected with the flange of the pipe end with a set of bolt nuts.

Generally, it is suitable for places where the space is relatively narrow or the pipeline is limited. For example, some occasions with small space and relatively low cost are imported electric clamp butterfly valves, the advantages are that it is easier to disassemble, the cost of the valve is lower, and the space is small, but the disadvantage is that there is a problem with the sealing surface, and the two sealing surfaces have to be disassembled!

There are flanges at both ends of the electric flange butterfly valve body, which are connected with the pipeline flange, and the sealing will be more reliable than the clamp-on butterfly valve, which is generally used in places with larger diameter or higher pressure, but the cost is higher than that of the clamp-type butterfly valve. For example, some Weidun VTON imported electric flange butterfly valves with a diameter greater than DN200, above pressure, and high sealing requirements.

Second, the choice between the two:

There are still some things to pay attention to in the design, for example, the clamp-on valve bolt is generally relatively long, and under high temperature conditions, the bolt may cause leakage after expansion, so it is not suitable for large pipe diameters under high temperature conditions. For example, the clamp-type butterfly valve generally cannot be used at the end of the pipeline and the downstream needs to be disassembled, because when the downstream flange is removed, the clamp-type valve will fall down, and in this case, it is necessary to make a short section in order to disassemble, and the flanged butterfly valve does not have the above problems, but the cost will be relatively high.

All in all, the imported electric flange butterfly valve is suitable for various working conditions, but the cost is higher than that of the imported electric clamp butterfly valve; The imported electric pinch butterfly valve is low in cost, but it is generally suitable for occasions with relatively small calibers at room temperature and pressure.

There are many things to say, and there is no physical thing that comes more directly.

The butterfly valve below is flanged.

The butterfly valve below is a clamp-on type.

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 above is the clamp-type turbine butterfly valve and the flanged turbine butterfly valve, from the appearance we can intuitively see the difference between the two.

From the point of view of specific working conditions, when selecting imported valves, use the clamp butterfly valve as much as possible, which is light in weight and easy to replace. However, the bolt length of the clamp butterfly valve is longer, and the construction accuracy is required to be higher, if the flanges on both sides are not misaligned, the bolt will be subjected to greater pressure, and the valve is easy to leak. Under high temperature conditions, the bolt of the clamp butterfly valve may leak after expansion, so it is not suitable for large pipe diameters if it is a high temperature condition.

1. The reference is different.

1) Flanged butterfly valve: When the flanged butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics.

2) Clamp butterfly valve: installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0°-90°, and when the rotation reaches 90°, the valve is fully open.

2. The structure is different.

1) Flanged butterfly valve: The sealing structure of the flanged butterfly valve is made of polytetrafluoroethylene and synthetic rubber to form a composite seat, which is characterized by the elasticity of the valve is still provided by synthetic rubber and uses the characteristics of PTFE with low friction coefficient, not easy to wear and tear, not easy to age, so that the life of the butterfly valve can be improved.

2) Clamp-on butterfly valve: Clamp-on butterfly valve has simple structure, small size, light weight, and is only composed of a few parts. Moreover, it can be opened and closed quickly by only 90° rotation, which is easy to operate, and the valve has good fluid control characteristics.

3. The characteristics are different.

1) Flanged butterfly valve: The connection between the butterfly plate and the valve stem adopts a pinless structure, which overcomes the possible internal leakage point. The outer circle of the butterfly plate adopts a spherical shape, which improves the sealing performance and prolongs the service life of the valve, and the pressure opening and closing is more than 50,000 times and still maintains zero leakage.

The seals are replaceable and reliably sealed in both directions.

2) Clamp butterfly valve: When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics. There are two types of sealing types of butterfly valves: elastic seal and metal seal.

Elastomeric seal valves, the sealing ring can be embedded in the valve body or attached to the perimeter of the butterfly plate.

FirstThe United States imported the Keen Co brand of the clamp butterfly valve and flange butterfly valveFor example, the results are: different connection methods, different structures, and different costs.

1. The connection method is different.

Clamps and flanges are two different ways to connect the mattle.

Clamp butterfly valve: there is no flange on the valve body, and the valve chain is connected between the two pipeline flanges with stud bolts, that is, the butterfly valve is clamped between the two flanges, and then the two flanges are fixed with bolts.

Flanged butterfly valve: There is a flange on the valve body, and the flanges at both ends of the valve can be connected to the pipe flange with bolts.

Legend of the Crownco brand's butterfly valve

2. The structure is different.

The bolts of the clamp-type butterfly valve are relatively long, and there is no flange itself, so it is generally not installed at the end of the pipeline and the downstream position that needs to be disassembled, because when the downstream flange is removed, the clamp-type valve will fall, so that the pipes at both ends of the valve can not work normally; The flange butterfly valve does not have such a problem, the flange body has a flange, when paired with the flange on the pipeline, it is connected with bolts and the nut is locked, so when one end is removed, it will not affect the operation of the other end.

Legend of the flanged butterfly valve of the Kornco brand

3. The cost is different

The clamp butterfly valve has a longer bolt length. If the flanges on both sides are misaligned, the bolts will be subjected to relatively large shear force, resulting in easy leakage of the valve; In contrast, it will be more convenient to disassemble the clamp butterfly valve, and the cost of the valve is lower, but the disadvantage is that if there is a problem with one sealing surface, then both sealing faces have to be disassembled.

The above macro lead isAmerican Kornke brand of clamp butterfly valve and flanged butterfly valveIn contrast, it seems that there is not much difference, but there is still a certain difference, and everyone should pay attention to the distinction.

This problem mainly refers to the two forms of butterfly valves, the clamp type and the flange type

The clamp-on butterfly valve (the valve itself cannot be flanged) is made with a stud bolt.

Connect the valve between the two pipe flanges; The clamp-on butterfly valve has a simple structure, small size and light weight, and is composed of only a few parts. The valve only needs to rotate 90° to quickly open and close, the operation is simple, and the valve has good fluid control characteristics. The picture above below is the manual butterfly valve, and the picture below is the electric butterfly valve

<> flanged butterfly valve is a valve with a flange, and the upper two ends of the valve are connected with bolts.

on the pipe flange. The sealing surface is wear-resistant and has a long service life. The structure is unique, the operation is flexible, labor-saving, convenient, and not affected by the high and low pressure of the medium. The picture below shows the manual flanged butterfly valve, and the following picture shows the electric flanged butterfly valve

<>, the clamp type and the flange type with flange are the same, but the flange bolt for the clamp butterfly valve is relatively long, and the length is "2 times the flange thickness + valve thickness + 2 nuts thickness", and the clamp valve itself cannot be flanged; As long as the bolts and nuts are disassembled, then the pipes at both ends of the valve will not work properly.

The bolt of the flange type is relatively short, and the length is "2 times the thickness of the flange + 2 nuts", that is, the flange of the valve body and the flange on the pipeline are paired, connected by bolts, and the nut is locked; When the flange bolt nut at one end is removed, it does not affect the normal operation of the pipe at the other end.

The butterfly valve itself does not have a flange, it is connected by the extrusion of the pipe flange, and is generally connected by a stud bolt, and the flange butterfly valve itself has a flange, which is the same as that of an ordinary gate valve.

The function is similar, used in the sulfuric acid industry gas pipelines: furnace blower inlet, relay fan inlet, electric demisting series and connection valve, S02 main blower inlet, converter adjustment, preheater inlet and outlet and other adjustment and cut-off gas volume use. It is used in the sulfur incineration, conversion and dry suction section of sulfur acid production system, and is the preferred brand of valves for sulfur acid production equipment, and is considered by the majority of users to be:

The butterfly valve has good sealing performance, light operation, secondary corrosion, high temperature resistance, easy operation, flexibility, safe and reliable use, and has been widely used.

1. There are two commonly used butterfly valves: clamp-type butterfly valve and flanged butterfly valve. The clamp-type butterfly valve is to connect the valve between the two pipeline flanges with double-ended bolts, and the cost of the clamp-type butterfly valve is low, but the sealing performance is not as good as the flanged butterfly valve.

Second, the flanged butterfly valve is a valve with a flange, with a family bolt to disassemble the flange at both ends of the valve and connect it to the pipeline flange, the flanged butterfly valve cost is higher, but the sealing performance is better than the clamp butterfly valve.

3. The clamp-type butterfly valve saves space, and should be used as much as possible when the piping position is tight.

Fourth, the biggest difference between the clamp butterfly valve and the flanged butterfly valve is that the clamp butterfly valve saves a pair of flanges, but is not conducive to the disassembly and assembly of the boot key, etc., in the permitted occasions, the priority is to choose the clamp butterfly valve.

Fifth, when making a large diameter, the flange butterfly valve is more suitable than the clamp butterfly valve.