Butterfly valves are sealed and non sealed, as well as the use of soft and hard seals.

The two sides of the hard seal butterfly valve sealing pair are metal materials or other hard materials, and the sealing performance is poor, but the high temperature resistance, wear resistance, and mechanical properties are good. It is suitable for conveying various corrosive and non-corrosive fluid media in furnaces, coal gas, steam, natural gas, city gas, hot and cold air, chemical smelting projects and power generation environmental protection systems.

One side of the soft seal butterfly valve sealing pair is made of metal, and the other side is an elastic non-metallic material, which has good sealing performance, but is not resistant to high temperature, easy to wear, and has poor mechanical properties. It can be used in petroleum, chemical, metallurgy, hydropower and other industries, and is not suitable for high temperature, high pressure, corrosion resistance, wear resistance and other industries.

Hard-seated butterfly valves are used in corrosive sewage or steam-resistant high-temperature conditions, while soft-seated butterfly valves are used in water-related media with low temperatures.

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.

Hard seal: It is very difficult to replace a hard seal after it is damaged, and it is best to let the manufacturer send a technician to maintain it.

Soft seal: Soft seal is a little easier to replace than hard seal, but it is best to have corresponding tools when replacing and install it under the guidance of a technician.

Features of Soft Seal Butterfly Valve Small, lightweight, easy to disassemble and maintain, and can be installed in any position. The structure is simple, compact and 90 degrees open and close quickly. The operating torque is small, labor-saving and lightweight. The flow characteristics tend to be straight, and the regulation performance is good. The number of opening and closing tests is more than 10,000 times, and the service life is long. , to achieve complete sealing, gas test leakage is zero. , choose from different component materials, and can be suitable for a variety of media. Features of Hard Seal Butterfly Valve:

1) The unique design of three-way eccentricity [1] enables frictionless transmission between the sealing surfaces, which prolongs the service life of the valve.

2) Elastic seal is generated by torque.

3) The ingenious wedge-shaped design makes the valve have the function of automatic sealing that is tighter and tighter, and the sealing surface has compensation and zero leakage.

4) Small size, light weight, light operation and easy installation.

5) Pneumatic and electric devices can be configured according to user requirements to meet the needs of remote control and program control.

6) The material of the replacement parts can be applied to various media, and the lining can be anti-corrosion.

7) Diversification of continuous structure: butt clamp, flange, butt welding. According to the economic conditions and the medium used and the on-site environmental conditions, the customer can choose whether the butterfly valve is soft or hard sealed.

The difference between hard seal butterfly valve and soft seal butterfly valve is mainly the difference in structure, temperature resistance, pressure and sealing performance.

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 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 applied to medium and high pressure and other working 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.

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.

First of all, from the perspective of the sealing type, the ventilation is a non-sealed type, and the hard seal butterfly valve is a sealed type. The main thing is this difference!

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.

The difference between soft seal butterfly valve and hard seal butterfly valve, where is the fully lined butterfly valve used?

This article introduces in detail the difference and application of hard seal butterfly valve and soft seal butterfly valve, taking electric butterfly valve as an example. Thank you for the data support of the professional knowledge of the valve problem of the American Mighty Shield Vton Valve, if you think the answer is helpful to you, please raise your noble hand and give the American Mighty Ton Vton Valve a like.

The difference between soft seal butterfly valve and hard seal butterfly valve mainly lies in the distinction of sealing surface, mainly the application of the medium, the difference in temperature and pressure, the fully lined butterfly valve is mainly lined with rubber and fluorine, and is generally used for acid and alkali corrosion-resistant media;

If the imported electric butterfly valve is divided according to the sealing material, it can be divided into soft seal and hard seal, and the butterfly valve and electric actuator constitute the imported electric hard seal butterfly valve and the imported electric soft seal butterfly valve; What is the difference between the two, and how to distinguish and select applications. This article analyzes it.

The obvious difference between the hard seal and the soft seal of the electric butterfly valve is that the performance between the two is just opposite, the hard seal electric butterfly valve has poor sealing performance, but high temperature resistance, wear resistance, and good mechanical properties, while the soft seal electric butterfly valve is just the opposite of the former in terms of performance.

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, and 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: most of the soft-sealed electric butterfly valves are center-line types, and most of them are soft-sealed butterfly valves; Most of the imported electric hard seal butterfly valves are single eccentric, double eccentric and triple eccentric.

2. Temperature resistance: soft seal electric butterfly valve is used in room temperature environment. Hard-sealed electric butterfly valves can be used in low-temperature, normal-temperature, high-temperature and other environments.

3. Pressure: soft seal low pressure - normal pressure, electric soft seal butterfly valve is generally used; Hard seals can also be used for medium and high pressures. Electric hard-sealed butterfly valves can generally be used for:

4. Sealing performance: the sealing performance of the soft seal electric butterfly valve and the triple eccentric hard seal electric butterfly valve is relatively good, and the triple eccentric electric butterfly valve can maintain a good seal in the high pressure and high temperature environment.

In view of the above characteristics, the hard seal electric butterfly valve, as a component used to realize the on-off and flow control of the pipeline system, has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower, etc. The soft-sealed electric 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-sealed electric butterfly valves are mostly used in heating, gas supply, gas, oil, acid and alkali environments.