Valve guide

What is a valve?

A valve is a mechanical device that controls flow and pressure in a system or process. They are the basic components of the pipeline system for conveying liquid, gas, steam, mud, etc.

Provide different types of valves: gate valve, stop valve, plug valve, ball valve, butterfly valve, check valve, diaphragm valve, pinch valve, pressure relief valve, control valve, etc. There are many models of each type, each with different functions and functions. Some valves are self operated, while others are manually operated or with actuators or pneumatic or hydraulic.

The functions of the valve are:

stop and start the process

reduce or increase flow

control flow direction

regulate flow or process pressure

piping system to release certain pressure

There are many valve designs, types and models, which have a wide range of industrial applications. All meet one or more functions identified above. Valves are expensive items, it is important to specify the correct valve for the function, and the valve must be made of the correct material for the treatment fluid.

Regardless of type, all valves have the following basic components: body, bonnet, trim (internal components), actuator and packing. The basic components of the valve are shown in the figure below.


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

The valve is the control part in the pipeline fluid transportation system, which is used to change the channel section and medium flow direction. It has the functions of diversion, cut-off, throttling, check, shunt or overflow pressure relief. There are many kinds and specifications of valves for fluid control, from the simplest stop valve to the most complex automatic control system. The nominal diameter of the valve ranges from very small instrument valve to industrial pipeline valve with diameter up to 10m. It can be used to control the flow of water, steam, oil, gas, mud, corrosive media, liquid metal and radioactive fluid. The working pressure of the valve can be from 0.0013mpa to 1000MPa, and the working temperature can be from c-270 ℃ to 1430 ℃.

The valve can be controlled by a variety of transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic, electromagnetic, electro-hydraulic, pneumatic, spur gear, bevel gear drive, etc, The valve operates according to the predetermined requirements, or simply opens or closes without relying on the sensing signal. The valve relies on the driving or automatic mechanism to make the opening and closing parts move up and down, slide, swing or rotate, so as to change the size of its flow channel area to realize its control function.

Post time: Jun-15-2020