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Application of butterfly valve and gate valve under different working conditions

Gate valve and butterfly valve are used in the pipeline to regulate the flow. Of course, there are some methods in the selection of butterfly valve and gate valve. In the water supply network, in order to reduce the soil depth of the pipeline, butterfly valve is generally selected for the larger diameter pipeline. If it has little effect on the soil depth, gate valve is selected. However, the price of gate valve with the same specification is higher than that of butterfly valve. As for the demarcation line of caliber, it should be considered according to the specific situation. […]

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What is a valve

What is a valve? In fluid piping system, valve is the control element, its main function is to isolate equipment and piping system, regulate flow, prevent backflow, regulate and discharge pressure. The valve can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Because it is very important to select the most suitable valve for the piping system, it is very important to understand the characteristics of the valve and the steps and basis for selecting the valve. Classification of valves There are two main types of valves: 1. Automatic […]

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How to judge the quality of solenoid valve quickly?

The quality of the solenoid valve depends on two aspects: one is the coil, The second is valve body. So the test is mainly to test these two aspects. If you find a 24V power supply, connect it to the coil. If you can hear the sound, it means that the coil and valve core of the solenoid valve are normal, and can be sucked normally. Then check whether the air leaks. If there is air source, the best way is to connect the air source directly to judge whether the air leaks. If there is no air source, you […]

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Selection and installation of control valve

In the automatic control of modern chemical plant, regulating valve is very important. By receiving the control signal from the control unit, the process parameters such as medium flow, pressure, temperature and liquid level can be changed. It can be said that the regulating valve is the last gate in the process loop. Therefore, how to correctly select the control valve to achieve the best control effect has become a key problem. Selection of control valve The selection of control valve should be based on the characteristics of control system, interference source and S (valve resistance ratio) value. General selection […]

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10 kinds of common pipe connection technology

Pipeline connection is a very important link in engineering construction, which is directly related to the quality of the project. With the rapid development of the pipeline industry, there are more and more methods to connect pipelines. However, different pipelines have their own advantages and disadvantages, and also have different uses. The correct selection of connection methods is a skill that engineering personnel must have. The process of this paper summarizes the characteristics of 10 pipe connection methods, and provides relevant pictures and texts for you to learn and exchange. Threaded connection It is called screw connection, which connects pipes […]

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Do stainless steel bolts must be used for stainless steel flanges?

There are often many owners who force the contractor to rectify on the ground that stainless steel flange using carbon steel or alloy steel bolts will cause corrosion, but it is difficult to explain the numerous grievances of the contractor. But is it really hard to explain? Actually, it’s easy to explain. 1. Article 5.8.7 of GB50316-2000(2008) code for design of industrial metal pipelines: under the condition of severe cycle, bolts or double-headed studs for flange connection shall be made of alloy steel. Note: Under the condition of severe cycle (refers to the occasion where the internal stress of pipeline […]

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Quick understanding of safety valve

Usually, the ordinary valve only plays the role of a switch, while the safety valve can also play the role of protecting equipment and preventing accidents in addition to the role of a switch, it is a very important safety attachment in special design. Today, yaang will take everyone to learn about safety valves. Classification and characteristics of safety valves Classified by overall structure and loading mechanism The safety valve can be divided into three types according to its overall structure and loading mechanism: hammer lever type, pulse type and spring type. The spring safety valve is commonly used. ①. […]

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How to calculate the thickness of blind flange

How to calculate the thickness of blind flange? In chemical enterprises, it is often encountered that production and maintenance are carried out at the same time. In order to ensure the effective isolation of production system and maintenance system, blind flanges are usually added between the flanges of associated pipelines. This involves the selection of blind flanges. For high pressure blind flanges, there are a series of products available for purchase, which will not be introduced here. For the medium and low pressure blind flange, each unit makes a round iron plate as blind flange by gas cutting, and the […]

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What is valve assembly

What is valve assembly? Valve assembly is the last stage in the manufacturing process. Valve assembly is the process of combining all parts and components of the valve together to make it a product according to the specified technical premise. The whole machine is the most basic unit of valve assembly, and several parts make up the parts of the valve (such as valve cover, valve clack parts, etc.). The assembly process of several parts forming parts is called component assembly, and the assembly process of several parts and components forming a valve is called general assembly. Assembly work has […]

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Comparison and determination of key performance indexes of pipes in the Heilon……

In the control project of the Sino-Russian Eastern Route Natural Gas Pipeline, the Heilongjiang crossing section crosses the borders of China and Russia. The LSAW steel pipes and induction heating bends used are supplied by Russia, However, the negotiations between China and Russia require that the key performance indicators of pipes implement the most stringent requirements of both China and Russia. In order to reasonably determine the pipe performance indexes of Heilongjiang crossing section and ensure pipeline safety, the pipe standards of China and Russia were compared and analyzed, and the key performance indexes of LSAW steel pipes and induction […]

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