What does the pair flange look like for a clamp hard seal 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.

It is the same as the mating flange of ordinary flanged butterfly valves.

The difference between the butterfly valve flange and the ordinary flange is in the inner diameter. The inner diameter of the flange of the butterfly valve is exactly the same as the inner diameter of the valve DN and a groove at the back, and this groove is to insert the connected steel pipe into it, leaving one or two or more margins on both sides (depending on the diameter of the butterfly valve).

In addition to these, there is no difference between the butterfly valve flange and the ordinary flange. The flange of the butterfly valve is also known as the butterfly flange or the special flange for the clamp, which is a special flange on the butterfly valve and matches the butterfly valve of the clamp valve. Among the butterfly valves, there is also a flanged butterfly valve, which has a flange on it.

The flange used in this butterfly valve can be used as an ordinary flat welded product, and there is no need to choose the flange of the butterfly valve. The outer diameter, thickness, center distance and bolt hole of the butterfly valve flange are all the same. Moreover, the bolts used in the butterfly flange are double-ended bolts.

The use of bolts is changed according to different temperatures of use.

The flange of the clamp butterfly valve, also known as the butterfly flange or the special flange for the clamp, is the special flange for the butterfly valve in the pipeline installation, and matches the butterfly valve of the clamp type.

The main difference between the special flange of the clamp butterfly valve and the ordinary flange is the inner diameter of the flange, the inner diameter of the special flange is just in line with the nominal diameter of the required butterfly valve in the back of a groove, this groove can insert the connected steel pipe into it, to ensure the sealing effect of the clamp butterfly valve, if the ordinary flange is used, the sealing effect of the butterfly valve can not be guaranteed. In addition, the outer diameter, thickness, center distance and bolt hole of the special flange for the clamp butterfly valve are the same, and the bolts used are double-ended bolts. The use of bolts is changed according to different temperatures of use.

Butterfly valve hard seal refers to the sealing pair is called metal material or hard other materials on both sides"Hard sealed".This kind of seal has poor sealing performance, but it is resistant to high temperatures, wear, and has good mechanical properties. Such as:

Steel + Steel; Steel + Copper; steel + graphite; steel + alloy steel; (The steel here may also be cast iron, cast steel, alloy steel may also be hardfacing, sprayed alloy).

Soft seal: The two sides of the sealing pair are made of metal material on one side and the other side is an elastic non-metallic material"Soft seal".This kind of seal has good sealing performance, but it is not resistant to high temperature, easy to wear, and has poor mechanical properties.

Such as: steel + rubber; Steel + PTFE [wiki] polyethylene [wiki]; Wait. The soft sealing seat is made of non-metallic materials with certain strength, hardness and temperature resistance, with good sealing performance and zero leakage, but the life and adaptability to temperature are relatively poor.

Hard seals are made of metal and have relatively poor sealing performance, although some manufacturers claim to have zero leakage. Soft seals can not meet the process requirements for some corrosive materials, and hard seals can solve them! These two seals can complement each other, the soft seal is relatively good in terms of tightness, but now the tightness of the hard seal can also meet the corresponding requirements!

The advantage of soft sealing is good sealing performance, and the disadvantage is that it is easy to age, wear and tear, and has a short service life. Hard seals have a long service life, but the sealing performance is relatively worse than that of soft seals.

The main differences in its structure are as follows:

1. Structural differences: soft seal butterfly valves are mostly midline type hard seals, and most of them are single eccentric, double eccentric, and triple eccentric butterfly valves.

2. Temperature resistance: soft seal is used in room temperature environment. Hard seals can be used in low temperature, normal temperature, high temperature and other environments.

3. Pressure: soft seal low pressure-normal pressure, hard seal can also be used in medium and high pressure and other working conditions.

4. Sealing performance: soft seal and triple eccentric hard seal butterfly valve have good sealing performance, and triple eccentric butterfly valve can maintain good sealing in high pressure and high temperature environment.

In view of the above characteristics, the soft seal butterfly valve is suitable for two-way opening and closing and adjustment of ventilation and dust removal pipelines, water treatment, light industry, petroleum, chemical and other industries. Hard seal butterfly valves are mostly used in heating, gas supply, gas, oil, acid and alkali environments.

With the widespread use of butterfly valves, its characteristics of easy installation, convenient maintenance and simple structure are becoming more and more obvious. Electric soft seal butterfly valves, pneumatic soft seal butterfly valves, hard seal butterfly valves, etc. have begun to replace electric gate valves and globe valves on more and more occasions.

The soft seal is used for more water, and the hard and dense one is used for particles, or more on the heating pipe.

Flange butterfly valve product features:1). The two-way sealing performance is excellent, the torque value is small, and the parts are machinable.

2）。The flow characteristics tend to be straight. 3）。

The flange connection is easy to install, and it can be installed vertically or horizontally. 4）。The sealing pair material is diverse, and users can choose from it.

4）。The valve can be used at the end of the pipe for discharge, and the performance is good. 5）。

The seat seal is organically combined with the valve body, and the valve has a long service life. 6）。It has strong erosion resistance, is suitable for harsh working conditions, and can be used for media truncation and adjustment.

Hard Seal Flange Butterfly Valve Product Features:1). The design is reasonable, the structure is compact, and the opening and closing are fast.

2）。The three-piece metal composite cone bevel cutting structure can achieve zero leakage. 3）。

The opening torque is small, the sealing pair rotates frictionlessly, and the valve has a long service life. 4) Replace the material of the valve body and the composite sandwich of the sealing ring, which can be applied to different media. 5）。

Rational cone wedge design ensures uniform contact sealing.

Flange soft seal butterfly valve product features.

1. The design is novel and reasonable, the structure is unique, the weight is light, and the opening and closing is fast.

2. The operating torque is small, the operation is convenient, and the labor is saved and dexterous.

3. It can be installed and maintained in any position.

4. The seals can be replaced, and the sealing performance can achieve zero leakage of two-way sealing.

5. The sealing material is resistant to aging, corrosion and has a long service life.

Flange hard seal butterfly valve product features.

1. The butterfly plate sealing ring is a soft and hard multi-layer stacked metal ring, 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. The three-dimensional eccentric structure is adopted, and the valve seat and the butterfly plate have almost no friction, and it has the sealing function of tightening and tightening, and has the function of adjustment.

3. The sealing cover of the valve body of the flanged hard seal butterfly valve is made of surfacing cobalt-based cemented carbide, and the sealing surface is wear-resistant and has a long service life.

4. Flanged hard seal butterfly valve is resistant to high temperature and corrosion.