What is the difference between a butterfly valve flange and a flat welded flange

The appearance of the butterfly valve flange is the same as that of the flat welded flange, that is, the inner diameter is similar to that of the socket welding flange, that is, there are two inner diameter sizes, and the flat welding flange has only one inner diameter size [(Hebei Zhuoshuo Pipe)].

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.

1. The welding method is different.

The butt welding flange is that the interface end and the pipe to be welded should be completely consistent in terms of the diameter of the mouth and the wall thickness of the pipe, that is, the direct welding of the two pipes.

The interface of the flat welded flange is generally made of a concave platform that is a little larger than the outer diameter of the pipe that needs to be connected, and when welding with the pipe, it is necessary to insert the pipe into it for welding.

2. The welding process is different.

The welding performance of the butt welding flange is better than that of flat welding, and the corrosion of the butt welding flange will be relatively small. However, the welding and installation process of the butt welding flange will be more complicated, and both sides of the flange need to be welded, and the flat welding flange only needs to be welded on one side. On the whole, flat welding is much simpler than butt welding.

3. The scope of application is different.

Generally, flat welded flanges are used in low and medium pressure pipelines, and butt welding flanges are used in the connection of medium and high pressure pipelines. Under high pressure, welding with butt welding flanges is actually the main thing to reduce the stress concentration.

1. The valve connection method is different.

These two kinds of valves have their own flanges, also called flange valves, but the threaded flange valve is a threaded connection between the valve and the flange, that is, a threaded valve with two inner wire flanges; The welded flange valve comes with, that is, the flange on the weld has no thread, and a flange is welded at the end of the pipe to be bolted with the welded flange valve.

2. The threads are different.

Flanged valves are valves that are flanged to the pipeline, and this connection is the most common. Threaded valve mainly refers to the valve body with internal or external threads, which are connected with the pipeline thread. Whereas, welded flange valves do not have threads.

3. The scope of application is different.

Threaded flange valves are generally used in small diameter, low pressure, and the temperature is not too high for inconvenient disassembly and repair, and the threaded flange valve has the characteristics of convenient installation and maintenance, and can be used on some pipelines that are not allowed to be welded on the site. Welded flange valves are widely adaptable and easy to service.

The connection at both ends of the valve is not the same.

The welded valve is butt welded or socket welded, which is a step hole.

A threaded valve is a threaded valve that connects the two ends through threads and pipelines.

Flange valves are connected by flanges and pipeline flanges.

Threaded valves: internal threaded valves, external threaded valves, mainly refer to valve valves with internal threads or external threads connected with pipeline threads, called threaded valves, threaded valves, and internal tooth valves.

Blue valve: Blue valve refers to the connected blue valve, the connected type of blue valve pipeline is stable, and the high-pressure pipeline is used by the blue valve.

Plastic ball valve: plastic ball valve is suitable for interception of corrosive media during transportation, according to the temperature of the same material, -14 100, -40 140, all parts are assembled with RPP or PVDF injection molded parts, and the plastic ball valve has excellent corrosion resistance.

Hello,Welded flange valve manufacturer imported from the United States - Kornke KNKEGlad for your question.

Welded flange valve is welded flange valve, and the connection between the pipe and the flange is welded and flanged.

The flange in the welded flange valve is a flat welded flange, which can be directly welded to the pipeline, and can be divided according to the connection mode with the pipeline, and can be divided according to the connection mode between the valve and the pipeline;

1 Flange connection valve: the valve body is flanged, and the valve is flanged with the pipeline.

2 Threaded connection valve: a valve with internal or external threads on the valve body and threaded connection with the pipeline.

3. Welded connection valve: The valve body has a welded mouth and adopts a welded connection with the pipeline.

4. Clamp connection valve: the valve body is equipped with a clamp port and is connected with the pipeline by clamp coupling.

5. Ferrule connection valve: The valve is connected to the pipeline by ferrule.

Keen KNKE imported electric ball valve.

That's itThe United States imported welded flanges to mark the valve manufacturer - Kornke KNKEThe answer to what is a welded flange valve, I hope my help to you, and more information about welded flange valves, you can go to the official website of Kornke Industries in the United States for reference.

Welded flange valve is a kind of porous media control valve made of straight welding, which can effectively control the flow rate and flow rate of the medium in the pipeline. It is characterized by its simple structure and reliable performance, and is commonly used in industries such as utility facilities, chemicals, and power plants.

Welded flange valve is a kind of valve welded with the pipeline, which is connected by welding the connecting part of the flange or valve with the pipeline. This valve is characterized by small diameter, simple structure, flexible operation, low throttling resistance, good sealing performance, easy installation, and diverse dry mu models. In addition, because it is welded to achieve the connection of pipes, it is stronger and safer than threaded flange and flange connections, and is generally used in high-pressure, high-temperature and leak-prone pipeline systems.

The difference between flat welding flange and butt welding flange is mainly as follows: different weld forms, different materials, different connection methods, and different nominal pressures.

1. The form of the weld is different.

Flat welds cannot be inspected by x-rays. The form of flat welded flange pipe and flange weld is fillet weld, and flat weld is two corner girth weld. The weld of the flange and the neck pipe is a C weld, and the post-weld non-destructive testing is different.

Butt welds can be inspected with X-rays. The weld between the butt weld flange and the pipe is an girth weld. The welded joint of the butt weld flange and the neck pipe is a Class B weld.

2. The material is different.

The flat welded flange material with neck is processed by ordinary steel plate with thickness that meets the requirements, and the butt welded flange material with neck is mainly processed by forged steel parts.

3. The connection method is different.

Flat welded flanges with necks are generally corner joints between the pipe and the flange. Flat welded flanges can only be connected to pipes, not directly to butt welded pipe fittings.

The neck butt weld flange is the butt joint between the flange and the pipe. Butt welded flanges can be directly connected to all butt welded fittings (including elbows, tees, diameter pipes, etc.) and of course pipes.

4. The nominal pressure is different.

The nominal pressure of the flat weld flange with the neck is MPa, and the nominal pressure of the flange with the neck is 1-25 MPa. Obviously, flat welded flanges with necks are suitable for lower pressure levels.

The butt welding flange is the same diameter and wall thickness of the pipe at the interface end as the pipe to be welded, just like the two pipes. Let's talk about the difference between flat welding flange and butt welding flange.

The weld of the flat welded flange cannot pass the radiation test, and the weld of the welded flange can be. The weld of the pipe with the neck flat weld flange and flange is in the form of fillet weld, and the weld of the neck butt weld flange and the pipe is in the form of a circumferential butt weld;

Flat welds have bosses that resemble butt welds, grooves are formed in the bosses, and the tubes are welded inside. Sleeve welding means that there is no boss and the groove is opened directly on the flange body, as if a hole was opened in a blind flange, and then the groove is opened.

Compared with butt welding flanges, flat welding flanges have a simple structure and save materials, but the rigidity and sealing are not as good as neck welding flanges. Flat welded flanges are widely used in the connection of medium and low pressure vessels and pipelines.

The flat welded flange with neck is made of ordinary steel plate, the thickness meets the requirements, and the neck butt welding material is processed from forged steel.

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

The clamp-type butterfly valve (the valve itself cannot be flanged) is to connect the valve between the two pipe flanges with a stud bolt; The clamp-on butterfly valve has a simple structure, small size and light weight, and is composed of only 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. 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 to the pipe flange with bolts. 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 specifications of the clamp type and the flange type are the same, but the flange bolts of the clamp butterfly valve are 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 butt welding flange is a high neck flange, and the connection with the pipe is the method of butt welding.