Is there a specified direction for the flow of the medium in the 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.

Yes, there are arrows on the valve body.

The working conditions and medium of butterfly valves are as follows:

There are many types of butterfly valves, some are quick shut-off and some are continuously adjusted. It is mainly used for liquid and gas low-pressure large-diameter pipelines. It is suitable for occasions where the pressure loss requirements are not high, the flow rate needs to be adjusted, and the opening and closing requirements are fast;

1. Usually the temperature is below 300 and the pressure is below 40 kg (the pressure used by butterfly valves is generally not very high, like the domestic ones are basically rarely cl600), the medium is generally used for water and gas, and the requirements for the medium are not high, and granular media can also be used.

2. As a sealed butterfly valve, it was after the emergence of synthetic rubber that it brought rapid development, so it is a new type of shut-off valve. In China until the eighties of the twentieth century, the butterfly valve mainly acts on the low-pressure valve, the valve seat is made of synthetic rubber, and in the nineties, due to the increase in communication with foreign countries, the hard seal (metal seal) butterfly valve has developed rapidly. At present, there are many valves with medium-pressure metal seal butterfly valves, such as the imported flanged hard seal butterfly valve of the American Weidun VTON, which can achieve two-way sealing and good service life, making the butterfly valve more widely used.

3. The medium that the butterfly valve can transport and control are water, condensate, circulating water, sewage, seawater, air, coal gas, liquid natural gas, dry powder, mud, fruit pulp and mixture with suspended solids.

4. Butterfly valve is suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipeline is relatively large, it is about three times that of the gate valve;

Therefore, when selecting a butterfly valve, the influence of pressure loss in the pipeline system should be fully considered, and the firmness of the butterfly plate under the pressure of the pipeline medium when it is closed should also be considered. In addition, the limitations of the operating temperature to which the elastomeric seat material can be subjected at high temperatures must also be taken into account. The structural length and overall height of the butterfly valve are small, the opening and closing speed is fast, and it has good fluid control characteristics, and the structural principle of the butterfly valve is most suitable for making large-diameter valves.

When a butterfly valve is required to be used to control the flow rate, it is important to select the correct size and type of butterfly valve so that it can work properly and effectively.

[Butterfly valve], also known as flap valve, is a simple structure of the regulating valve, can be used for low-pressure pipeline medium switch control butterfly valve refers to the shut-off part (disc or butterfly plate) for the disc, around the valve shaft rotation to achieve opening and closing of a kind of valve, the valve can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media and other types of fluids. It mainly plays the role of cutting 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.

Butterfly valve] working principleThe butterfly plate is driven by the valve stem, and if it turns 90°, it can complete a opening and closing. By changing the deflection angle of the butterfly, the flow rate of the medium can be controlled. Working Conditions and Media:

Butterfly valves are suitable for transporting various corrosive and non-corrosive fluid media in engineering systems such as furnaces, gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting, power generation and environmental protection, building water supply and drainage, etc., and are used to regulate and cut off the flow of media. 【Butterfly Valve】Functional UseButterfly valve (English: butterfly valve) refers to a kind of valve that turns around the valve shaft to open and close the closing part (disc or butterfly plate) as a disc and rotates around the valve shaft, 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.

Hello! Neither of these valves is very suitable for granular media, which is easy to get stuck in it and is not wear-resistant! It is recommended to use a metal hard-sealed butterfly valve, which is wear-resistant and high-temperature resistant.

Valve flow medium refers to the fluids, gases and liquids that pass through the valve.

For example: water, air, oil, gas, steam, acid, alkali, gas, heat transfer oil, etc., are all called mediums.

It's just what is in the valve. If the valve is water-through, the medium is water. Hope it helps.

Just like whoever is in your bottle, then the medium in your bottle is water.

What do the various valves rely on to control the flow of media? Is there a trick to identifying the various valves? I hope that the professionals can give me some pointers, and I hope that the more detailed the better.

Gate valve is one of the most commonly used opening and closing valves, which uses the gate plate (i.e., the opening and closing parts, in which the opening and closing parts are called the gate plate or gate, and the valve seat is called the gate seat or gate seat) to connect (fully open) and cut off (fully closed) the medium in the pipeline. It is not allowed to be used as a throttling, and the ram should be avoided to be opened in small quantities during use, because the erosion of the high-speed flowing medium will accelerate the damage of the sealing surface. The gate plate moves up and down in the plane perpendicular to the center line of the gate seat channel, and cuts off the medium in the pipeline like a gate, so it is called a gate valve.

Features of Gate Valve:

1. Low flow resistance;

2. It is more labor-saving when opening and closing;

There are many types of valves, and the "hardware manual" is more detailed.