What are the common types of butterfly valves? Which industries are suitable?

The structural principle of butterfly valves is particularly suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical industry, water treatment, etc., but also used in the cooling water system of thermal power stations. There are two commonly used butterfly valves: clamp butterfly valve and flanged butterfly valve.

The clamp butterfly valve is to connect the valve between the two pipeline flanges with stud bolts, and the flanged butterfly valve is to have a flange on the valve, and the flanges at both ends of the valve are connected to the pipeline flange with bolts.

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.

Butterfly valve (English: butterfly valve) refers to a kind of valve that turns around the valve shaft to open and close the closing part (valve disc or butterfly plate) as a disc, which mainly plays the role of cutting off and throttling on the pipeline. The butterfly valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjusting.

The butterfly valve is usually less than 90° when fully open to fully closed, and the butterfly valve and the butterfly rod itself do not have the ability to self-lock, so in order to position the butterfly plate, a worm gear reducer should be installed on the valve stem.

The use of worm gear reducer can not only make the butterfly plate have the ability to lock itself, make the butterfly plate stop in any position, but also improve the operation performance of the valve. The characteristics of the industrial butterfly valve can withstand high temperatures, the applicable pressure range is also high, the valve nominal diameter is large, the valve body is made of carbon steel, and the sealing ring of the valve plate is made of metal ring instead of rubber ring. The large high-temperature butterfly valve is made of steel plate welding, which is mainly used for flue air ducts and gas pipelines of high-temperature medium.

Structure: It is mainly composed of valve body, valve stem, disc plate and sealing ring. The body is cylindrical, with a short axial length and a built-in plate.

1. When the butterfly valve is used under special working conditions, such as throttling adjustment, or strict sealing, or serious wear, low temperature (cryogenic) and other working conditions, it is necessary to use a special butterfly valve with metal seal with adjustment device.

2. Metal-to-metal wire sealed double eccentric butterfly valve is suitable for urban heating, gas supply, water supply and other gas, oil, acid and alkali pipelines, as a regulating and throttling device.

3. Butterfly valve is suitable for fresh water, sewage, seawater, salt water, steam, natural gas, food, medicine, oil and various acids and alkalis and other pipelines that require complete sealing, zero gas test leakage, high life requirements, and working temperature of -10 degrees and 150 degrees.

4. The soft seal eccentric butterfly valve is suitable for the two-way opening and closing and adjustment of ventilation and dust removal pipelines, and is widely used in gas pipelines and waterways of metallurgy, light industry, electric power and petrochemical systems. In addition to being used as a program control valve for large-scale pressure swing adsorption gas separation device, metal-to-metal surface sealed triple eccentric butterfly valve can also be widely used in petroleum, petrochemical, chemical, metallurgy, electric power and other fields.

Butterfly valve and box valve are more commonly used valves, and their functions are different, so they need to be distinguished before purchasing, and then choose the appropriate valve to use to ensure a normal home. So what are the differences between butterfly valves and gate valves.

1. What are the differences between butterfly valves and gate valves?

1. Mode of action.

The gate valve with stable performance on the market drives the valve plate through the valve stem, and drives the valve plate to move vertically up and down to achieve the purpose of opening and closing the valve. This unique mode of operation can ensure that all water flow is cut off in time, and a better shut-off effect is achieved; The butterfly valve realizes the opening and closing of the valve through the rotational movement of the valve plate, so as to maintain the requirement of fast opening and closing.

2. Effect of use.

The gate valve can ensure a better sealing effect when in use, after all, the valve plate can be connected to the corresponding track; Butterfly valves have a certain water flow regulation function and can be used in quick-opening occasions, but their sealing performance is much lower than that of gate valves.

3. Direction of use.

Professional gate valve products have good use effect and superior sealing performance, and can be used in some occasions with high sealing requirements; Butterfly valves are small in size and can be used in places where installation space is limited. After all, there is a big difference in the performance of gate valves and butterfly valves.

2. What should be paid attention to during the installation of butterfly valves?

1. Before installation, you should know whether there is a problem with the product performance and flow direction arrow, and rub the inner cavity of the valve. No stains are allowed to adhere to the sealing ring and disc, and the disc should not be closed before cleaning to avoid damaging the sealing ring.

2. It is recommended to use a special flange for butterfly valves, and the best position for installation on the pipeline is to install vertically, but it cannot be installed upside down.

3. The flow needs to be adjusted during use, and there is a worm gear gearbox control. For butterfly valves with more openings and closings, every 1 2 months or so, open the worm gear box cover to see if the butter can be used normally.

I concluded: What are the differences between butterfly valves and gate valves, I will introduce them here first, do you understand it? The selection of valves needs to be determined according to the actual situation, so that you can choose the right one, which is safer and more assured for later use.