The soft seal butterfly valve is divided into a general body

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.

Refers to the weight of the valve body, which is generally approximate.

If butterfly valves are divided according to the sealing form, they can be divided into metal hard seals and rubber soft seals.

Let's look at the definition of the two first, then look at their differences, and then look at the selection.

A hard seal butterfly valve is a seal that is made of metal or other hard materials on both sides of the sealing pair"Hard sealed"。The sealing performance of the butterfly valve hard seal is poor, but it is resistant to high temperature, high pressure, wear and tear, and has good mechanical properties. For example, the commonly used Vton hard-sealed butterfly valve can be used in high-temperature occasions with a temperature of 650.

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 Butterfly Valve: One side of the sealing pair is made of metallic material, and the other side is an elastic non-metallic material, generally rubber and PTFE, which is called"Soft seal".The sealing performance of this seal is better, such as the commonly used Weidun VTON's imported soft seal butterfly valve, no matter used in water, oil, gas and other media, it can achieve zero leakage and good sealing; However, it is not resistant to high temperature, easy to wear, and has poor mechanical properties.

Such as: steel + rubber; steel + PTFE;

The soft sealing seat is made of non-metallic materials with certain strength, hardness and temperature resistance, with good sealing performance, and the hard seal of Weidun VTON can reach zero leakage, but the life and adaptability to temperature are relatively poor. Hard seals are made of metal, and the sealing performance is relatively poor, although some valve manufacturers claim to be able to achieve zero leakage butterfly valves, but in reality it is difficult to achieve. Soft sealing can not meet the process requirements of some corrosive materials, and hard seal disc valve can solve it!

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 the soft seal disc valve is that it has good sealing performance, and the disadvantage is that it is easy to age, wear and tear, and has a short service life. Hard-seated butterfly valves have a long service life, but the tightness is relatively worse than that of soft-sealed butterfly valves.

The difference between the structure of a hard-seated butterfly valve and a soft-seated butterfly valve:

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

2. Temperature resistance: soft seal butterfly valve 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 butterfly valve low pressure-normal pressure, hard seal can also be used under medium and high pressure conditions.

4. Sealing performance: soft seal butterfly valve 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.

Selection of soft seal butterfly valve and hard seal butterfly valve.

In view of the above characteristics, VTON soft seal butterfly valve is suitable for two-way opening and closing and adjustment of ventilation and dust removal pipelines with high sealing requirements and low temperature and pressure, water treatment, light industry, petroleum, chemical and other industries. Weidun VTON hard seal butterfly valve is mostly used in the occasion of relatively low sealing requirements, but the medium temperature is high, the pressure is high, and the wear is relatively strong, heating, gas supply, and gas, oil, acid and alkali and other environments.

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 pneumatic soft seal butterfly valve.

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.

The difference between a hard-seated butterfly valve and a soft-seated butterfly valve

Performance differences

Hard Seal Butterfly Valve: The seal pair is made of metal or other hard materials on both sides, which is called "hard seal". This kind of seal has poor sealing performance, but it is resistant to high temperature, wear, good mechanical properties, and has a long service life.

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

Structural differences:

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 seal can be used in low temperature, room temperature, high temperature and other environments;

3. Pressure: soft seal is used for low pressure-normal pressure, hard seal can also be applied to 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 the 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 and other environments.

Abstract: Soft seal butterfly valve is a kind of butterfly valve, during installation, many people are curious about whether the installation of soft seal butterfly valve needs to add gaskets, in fact, it is necessary to carry out according to the situation, the soft seal butterfly valve of the wide side valve seat, there is no need to install gaskets when installing; In order to ensure that there is no leakage, it is best to add a gasket to ensure tightness. When in use, the problems in the use of the soft seal butterfly valve include the erosion of the soft sealing belt, which affects the sealing performance.

Whether the installation of the specific soft seal butterfly valve needs to add gaskets and what are the problems in the use process of the soft seal butterfly valve, let's take a look in the article! 1. Whether the installation of the soft seal butterfly valve needs to add a gasket.

Soft seal butterfly valve installation does not use gaskets, this needs to be divided into situations, soft seal butterfly valves, the characteristics of the clamp type soft seal butterfly valve, there are two kinds of wide side valve seat and narrow side valve seat.

1. The soft-sealed butterfly valve with wide-side seat does not need to be installed with gaskets during installation.

2. In order to ensure that there is no leakage, it is best to add gaskets to ensure tightness.

2. What are the problems in the use of soft seal butterfly valves?

The advantage of soft seal butterfly valve is good sealing performance, and the disadvantage is that it is easy to age, wear and tear, and has a short service life, so some problems will inevitably occur in use, so what are the problems in the use of soft seal butterfly valve?

1. Since the multi-layer soft and hard stacked sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive scouring on its sealing surface, and the dust pants in the metal sheet interlayer are washed out, which directly affects the sealing performance.

2. Due to the limitation of the structural conditions, the structure is not suitable for valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.

3. Due to the principle of three eccentric structure, the sealing between the sealing surface of the valve plate and the valve seat is pressed to the valve seat by the torque of the transmission device. In the positive flow state, the higher the medium pressure, the tighter the sealing and extrusion. When the medium in the flow channel is reversed, with the increase of the medium pressure, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, and the seal begins to leak.