Valve Introduction

A valve is a device used to control the direction, pressure, and flow of a fluid in a fluid system. It is a device that enables or stops the medium (liquid, gas, powder) in piping and equipment and can control its flow.

The valve is a control component in the pipeline fluid conveying system, which is used to change the passage section and the flow direction of the medium, and has the functions of diversion, cut-off, throttling, non-return, shunt or overflow and pressure relief. Valves used for fluid control, from the simplest shut-off valve to various valves used in extremely complex automatic control systems, have a wide range of varieties and specifications. The nominal diameter of the valve ranges from a very small instrument valve to a large diameter of 10m Valves for industrial pipelines. It 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 range from 0.0013MPa to 1000MPa ultra-high pressure, and the working temperature can Ultra-low temperature of c-270℃ to high temperature of 1430℃.

The control of the valve can adopt a variety of transmission methods, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic hydraulic, electro-hydraulic, gas-hydraulic, spur gear, bevel gear drive, etc.; Or under the action of other forms of sensing signals, it acts according to the predetermined requirements, or simply opens or closes without relying on the sensing signals. The valve relies on the drive or automatic mechanism to make the opening and closing parts lift, slide, swing or rotate. Movement, thereby changing the size of its flow channel area to achieve its control function.