The valve is a kind of pipeline accessories. It is a device used to change the direction of the passage section and the direction of medium flow to control the movement of the medium. It has diversion, cut-off, regulation, throttling, non-return, diverting or overflow pressure relief, etc. Features. The next small series for everyone to introduce the types of valves and valves how to buy. The kind of valve 1. Globe valve It is mainly used to switch on or cut off the medium in the pipeline. It is generally used for medium and small diameter pipes. The applicable pressure and temperature range is very large. 2, check valve Check valves are valves that automatically stop the flow of fluid back, also known as check valves. The fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than the outlet side, the valve flap automatically closes under the influence of the fluid pressure difference, its own gravity and other factors to prevent the backflow of the fluid. Check valves are usually used for pump outlets. 3, safety valve The principle of action is based on the balance. Once the pressure on the valve is greater than the set pressure of the spring valve flap, the valve flap will be pushed open by this pressure and the gas (liquid) body of the pressure vessel will be pushed out to reduce the pressure inside the pressure vessel. pressure. 4, gate valve The gate valve is one of the commonly used shut-off valves and is mainly used to switch on or cut off the medium in the pipeline and is not suitable for regulating the flow of the medium. The gate valve is suitable for a wide range of pressures, temperatures and bore diameters, and is particularly suitable for medium and large diameter pipes. From the structural form, the main difference is the form of the sealing element used. According to the form of the sealing element, the gate valve can be divided into a variety of different types, among which are commonly used: parallel gate valves, parallel wedge gate valves. 5, ball valve The ball valve uses a ball with a circular through hole as the opening and closing part, and the ball rotates with the valve stem to realize a valve for opening and closing movement. How to choose a valve 1, to clarify the use of the valve in the device or device, determine the conditions under which the valve can work, what is the applicable medium, the working pressure and temperature, etc.; 2. Understand the nominal diameter and connection method of the connecting pipe with the valve: flange, thread, welding, etc.; 3, determine the way to operate the valve: manual, electric, electromagnetic, pneumatic or hydraulic, electro-hydraulic linkage; 4, according to the pipeline conveying medium, working pressure, working temperature to determine the selected valve housing and internal parts of the material: cast steel, carbon steel, stainless steel, alloy steel, stainless steel, acid alloy, copper alloy; 5, select the type of valve, determine the type of valve, parameters and geometric parameters of the selected valve, such as: structure length, flange connection form and size, the size of the valve height direction after opening and closing, the size and number of bolt holes connected , Overall valve size, etc. 6, in the choice of Baotou valve, sometimes not only according to the above several options, but also to follow the basis of the choice of valve: 7. The use of the selected valve, operating conditions and control methods should be clearly defined. The valve specifications and categories should comply with the requirements of the pipeline design document. The working pressure should be greater than or equal to the working pressure of the pipeline. 8. Understand the nature of the working medium: work pressure, working temperature, corrosion performance, whether it contains solid particles, whether the medium is toxic, whether it is flammable, explosive medium, viscosity of the medium. 9. Understand the requirements for valve fluid properties: flow resistance, discharge capacity, flow characteristics, seal rating, etc. 10, clear installation dimensions and dimensions requirements: nominal diameter, and pipe connection and connection dimensions, dimensions or weight restrictions. 11. Additional requirements for the valve's product reliability, service life, and explosion-proof performance of electrical devices. Editor's summary: The types of valves and how to purchase the valves are introduced here. We hope to help everyone. If you want to know more related information, you can pay attention to this website information. Doors to buy decoration accessories to buy household goods to buy green plants to buy building materials to buy Automobile Interior Combustion Test Machine Automobile Interior Combustion Test Machine,Combustion Test Machine,Vertical Combustion Testing Machine,Vertical Horizontal Combustion Test Machine Dongguan Best Instrument Technology Co., Ltd , https://www.dgbestinstrument.com
