The
valve is a control component in the pipeline fluid conveying system. It is used to change the passage section and the flow direction of the medium. It has the functions of diversion, cutoff, adjustment, throttling, check, diversion or overflow pressure relief.
Valves used for fluid control, from the simplest shut-off valve to the various valves used in extremely complex automatic control systems, have a wide range of varieties and specifications, and the nominal diameter of the valve ranges from extremely small instrument valves to large diameters up to 10m. Valves for industrial pipelines. The valve can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metals and radioactive fluids. The working pressure of the valve can be from 1.3х10MPa to 1000MPa ultra-high pressure and working temperature From the ultra-low temperature of -269℃ to the high temperature of 1430℃. The valve can be controlled by a variety of transmission methods, such as manual, electric, hydraulic, pneumatic, worm gear, electromagnetic, electromagnetic-hydraulic, electric-hydraulic, pneumatic-hydraulic, spur gear, bevel gear drive, etc. ; Under the action of pressure, temperature or other forms of sensing signals, it can act according to the predetermined requirements, or simply open or close without relying on the sensing signals. The valve relies on the drive or automatic mechanism to make the opening and closing parts lift and slide Move, swing or rotate, thereby changing the size of the flow channel to achieve its control function.
The purpose of the valve The valve is a kind of pipeline accessory, it is a device used to change the section of the passage and the flow direction of the medium, and control the movement of the conveying medium. It has diversion, cut-off, adjustment, throttling, check, diversion or overflow Functions such as pressure relief.
Specifically, the valve has the following purposes: 1. Cut-off valve: connect or cut off the medium in each section of the pipeline. Such as gate valve, globe valve, ball valve, plug valve, diaphragm valve, butterfly valve, etc. 2 Regulating valves: Regulate the flow and pressure of the medium in the pipeline. Such as throttle valve, regulating valve, pressure reducing valve, safety valve, etc. 3 Shunt valve: change the flow direction of the medium in the pipeline, used to distribute, separate or mix the medium. Such as distribution valves, three-way plug valves, three-way or four-way ball valves, traps, etc. Valve classification There are many types of valves. With the continuous improvement of the process and performance of various complete sets of equipment, the types of valves are still increasing, but in general they can be divided into two categories: automatic valves rely on media (liquid, gas, Steam, etc.) a valve that operates on its own. Such as safety valves, check valves, pressure reducing valves, traps, hydraulic control valves, emergency shut-off valves, exhaust valves, etc.
