DN350 to clamp butterfly valve. Why doesn t it match with the flange?

The pairing of butterfly valves and flanges should consider the differences in size, pressure, and manufacturing specifications. If the pressure and size are the same, you have to dig deep into the flange standard of the butterfly valve bolt hole layout reference, and then select the flange that meets the standard. Because the reference standards are different, the flange of the same specification and pressure level may be different in size, number of bolts, and bolt hole circle size.

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, 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 butterfly valve and flange pressure should be the same.

What do you mean by the disagreement, as long as the center distance and the number of flange holes can be matched, it can be connected.

The connection mode is different: one is flange connection, and the other is clamp connection;

The effect is pretty much the same; It is used for gas pipelines in the sulfuric acid industry: furnace blower inlet, relay fan inlet, electric demisting series and communication 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 valve for sulfur acid production device, which is considered by the majority of users to be: good sealing performance, light operation, secondary corrosion, high temperature resistance, easy operation, flexible operation, safe and reliable butterfly valve, which has been widely popularized and used.

It is also widely used in chemical, petrochemical, smelting, pharmaceutical, food and other industries in SO2, steam, air, gas, ammonia, CO2 gas, oil, water, brine, lye, seawater, nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid and other media pipelines as a regulating and intercepting device.

The flange butterfly valve has a flange hole on the top, which can be directly connected to the pipeline, and the flange is required for the butterfly valve, and then it is connected to the pipeline.

The use is the same, it is used to intercept and adjust, but the connection form is different, the clamp type is suitable for small-caliber valves, and the flange butterfly valve is suitable for large-caliber valves.

Mainly there is a difference in caliber, the butterfly valve is generally small-caliber, and the flange butterfly valve is used in large-diameter pipelines.

The purpose is the same, they are all to regulate the flow of fluid, their difference lies in the installation form, when the pressure is too large, or the flange type is better, for dangerous fluids are also recommended to use the flange type.

The use is the same, the difference is that the connection method is different, the clamp butterfly valve is to connect the valve between the two pipeline flanges with stud bolts, the flanged butterfly valve is the valve with a flange, and the upper two ends of the valve are connected to the pipeline flange with bolts. Mainly depending on the site conditions, the thickness of the clamp butterfly valve will be relatively thin.

The butterfly valve is a clamp type and is used for small-diameter valves, and the flanged butterfly valve is a flange type for large-diameter valves.

The special flange of the national standard 350 pair of clamp butterfly valves has two inner diameters.

The small inner diameter is 355mm, and the large inner diameter is 380mm

First, 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. 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.

Second, the structure is different.

1. Flanged butterfly valve: The sealing structure of the flanged butterfly valve is made of PTFE 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 not easy to age, so that the life of the butterfly valve can be improved.

2. Clamp butterfly valve: The clamp butterfly valve has simple structure, small size and 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.

Third, the characteristics are different.

1. Flange 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. 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.

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.

The connection is different.

One is the flange connection.

One is a clamp connection.

It depends on which one is convenient in practice, just like the annoying gun we used before, two ways to connect.

The flange butterfly valve is connected to the pipeline in the form of flange connection, and the connection mode of the butterfly valve is to clamp.

Clamps and flanges are two types of connections.

The pair clamp type is cheap, ** is roughly 2 3 of the flange.

When choosing imported valves, use the clamp type as much as possible, which is cheaper. Lightweight.

If the flanges on both sides are not aligned, the bolts will be subjected to greater shear force, and the valve is easy to leak.

The valve bolts of the clamp type are 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.

Moreover, the clamp-type butterfly valve generally cannot be used at the end of the pipeline and the downstream occasions that need 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 it, and 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 clamp butterfly valve body, only a few guide bolt holes, and the valve is connected with the flange of 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 cost of the valve is relatively high.

The sealing ring of the clamp butterfly valve is mainly on the valve body, which is smaller than the outer diameter of the ordinary flange. Therefore, the use of ordinary flanges cannot guarantee the effective sealing effect. Therefore, it is necessary to use a special butterfly valve flange. Resources.

This is due to the structure of the butterfly valve itself. When other valves are connected by flanges, the valve body itself is equipped with flanges, and the butterfly valve is connected by a pair of clamps, which is a set of special flanges. The cost has not increased, and when other valves are connected by flanges, they still need to be equipped with a pair of flanges.

The butterfly valve should use a special flange, because the structure of the butterfly valve itself is determined, and the butterfly valve adopts a clamp connection, which is a set of special flanges.

Butterfly valve, also known as flap valve, is a simple structure of the regulating valve, which can be used for the on-off control of low-pressure pipeline medium butterfly valve refers to the shut-off part (disc or butterfly plate) as a disc, rotating around the valve shaft to achieve opening and closing of a kind of valve, the valve 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. It mainly plays the role of cutting and throttling on the pipeline. The butterfly valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjusting.

The pressure sleeve sealing ring represented by Tianjin requires a special flange (i.e., small-diameter), and the butterfly valve we produce is suitable for general flanges.

You can check it out on ** below.

Each has its own advantages, the key is to see what your requirements are, if you want the most cheap, choose the right clip.

The flange type is better than the clamp type because it is easy to replace.

All have their own advantages, such as:

1.If you want the cheapest, go for the clip-on.

2.If you want something that is easy to replace, go for the flange type.

It mainly depends on what your specific requirements are, and you can choose according to the actual situation.

It's all about the same, and the ** of the flange is much more expensive.