Is there a national standard related to the special flange for the clamp butterfly 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 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.

No, it is a non-standard flange. They are all customized by manufacturers and merchants.

Many people must know that the butterfly valve flange is composed of these simple parts, and as long as it is slowly rotated vertically, it can be opened and closed quickly, and has the characteristics of good fluid control. Today, we will introduce in detail what is the standard of butterfly valve flange and what are the characteristics of butterfly valve flange, if you are interested in this topic, continue to understand.

What is the standard for butterfly valve flanges.

1. The butterfly valve flange will be relatively small in terms of volume, so it will be lighter in weight, it is an industrial component, and the installation of the butterfly plate is in the direction of the diameter of the pipeline. When we use it, the disc-shaped butterfly valve will rotate around the central axis, the angle of rotation is within 90°, once it is rotated to 90°, the valve will be in an open state. At present, the common butterfly valve flange has two sealing methods: elastic seal and metal seal, and the elastic seal flange valve can be embedded on the valve body, or around the butterfly plate.

2. The standards for the design and manufacture of butterfly valve flanges are generally based on two international standards: GB T12238-89 "General Valve Flange and Clamp Connecting Butterfly Valve" and JB T8527-1997 "Metal Seal Butterfly Valve". The size of the butterfly valve flange conforms to the provisions of PN=according to the provisions of JB convex welded steel pipe flange, and the structural length of the butterfly valve flange is specified in accordance with GB12221-89 "Flange Connection Metal Valve Structure Length". The inspection and test of the butterfly valve flange is based on the provisions of GB T13927-92 "General Valve Pressure Test".

What are the characteristics of butterfly valve flanges?

1. The composite seat of the butterfly valve flange is made of some strong elastic materials, of course, it not only has a lot of good elastic effects, but also uses the characteristics of PTFE with low friction cavity, not easy to wear and tear, not easy to age, so that the life of the butterfly valve can be improved. The sealing principle and structural characteristics of the flanged butterfly valve are the same as those of the ordinary midline butterfly valve, and the sealing structure of the flanged butterfly valve is made of polytetrafluoroethylene, synthetic rubber and phenolic resin to form a composite valve seat, so that the valve seat has better strength while being elastic.

2. The main advantage of the butterfly valve flange is that it will be relatively light in size, and it is relatively simple in terms of disassembly and maintenance, and can also be installed in any position, with simple and compact structure, small operating torque, and rapid opening of 90° rotation. It has better regulation performance, and the connection between the butterfly plate and the stem is a pinless structure that overcomes possible internal leakage points.

3. The butterfly plate is made of spherical shape, which can effectively improve the sealing function, and can also extend its service life, when the pressure is opened and closed for more than 50,000 times, it still maintains zero leakage. The seals can be replaced, and the seal is reliable to achieve two-way sealing, the butterfly plate can be sprayed according to user requirements, such as nylon or PTFE, the valve can be designed as a flange connection and a clamp connection, and the drive mode can be manual, electric or medium pneumatic.

Do you know what butterfly valve is? It is a kind of control valve, also known as flap valve, which is used for pipeline medium switch control, and has the effect of shut-off and throttling. Among the many types of butterfly valves, the application of flanged butterfly valves is very extensive, because of its novel vertical plate structure, light weight, low production cost, and very convenient and labor-saving operation, flanged butterfly valves are used in many industries.

So what are the characteristics of flanged butterfly valves? And what are its requirements? Then it's time for the answer to be revealed.

Flanged Soft Seal Butterfly Valve Features:

1. The design structure is novel, the overall size is small, and the weight is light.

2. The butterfly plate adopts double eccentricity, which opens and closes quickly, and the operation is light and labor-saving.

3. There is no sliding friction between the butterfly plate and the dense fiber mu, such as the sealing ring, the sealing surface is wear-resistant, the service life is long, the sealing is reliable, and it is easy to adjust.

Flanged hard-seated butterfly valves have the following characteristics:

1. The butterfly plate sealing ring is a soft and hard laminated metal sheet, which has the dual advantages of metal hard sealing and elastic sealing, and has excellent sealing performance in both low and high temperature conditions.

2. Adopting three-dimensional eccentric structure, the valve seat and the butterfly plate are almost frictionless, and it has the sealing function of getting tighter and tighter.

3. The sealing surface of the valve body is made of surfacing stainless steel and cobalt-based cemented carbide, which is wear-resistant and has a long service life.

4. The structure is unique, flexible operation, labor-saving, convenient, not affected by high and low medium pressure, and the sealing performance is reliable.

Specification Requirements:

DN(mm):d N350-DN2600

Nominal pressure: pn6 pn10 pn16

Maximum working pressure MPa: 1

Seal test pressure mpa:

Strength test pressure mpa:

Applicable medium: water, sewage.

Soft Seal Media Temperature: 65 Hard seal media temperature depends on the valve material.

Media flow rate: 3 ms

Executive Standards:

Design and manufacture: GB T12238-89 "General Valve Flange and Clamp Connection Butterfly Valve" JB T8527-1997 "Metal Seal Butterfly Valve" JIS

Flange size: PN = according to JB that is, the original standard JB82-59) "Convex Welded Steel Pipe Flange" stipulates.

pn = according to the convex integral steel pipe flange "resistance group provisions.

pn = according to the convex integral steel pipe flange.

Structural length: according to GB12221-89 "Flange Connection Metal Valve Structure Length".

Inspection and test: according to GB T13927-92 "General Valve Pressure Test".

The above is a detailed introduction to the characteristics and requirements of the flanged butterfly valve. If you are a friend who is engaged in professional work in this field, you should read this article carefully, it will be of great help. Compared with other butterfly valves, flanged butterfly valves not only have fewer consumables and are easy to process, but also have good adjustment performance, and are very convenient to install and maintain, so they are widely used in various industries.

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