Regulating valve is an automatic valve product, which regulates pressure, flow and temperature through electrical energy, and plays an important role in the field of industrial automation system. According to the driving mode, it can be divided into electric control valve, pneumatic control valve and self-operated control valve, each of which has its own advantages.

Working principle

Working principle of electric control valve

The electric regulating valve is made up of electric actuator and regulating valve, which are connected and assembled by mechanical connection, debugging and installation. By receiving the signal of industrial automation control system, the valve is driven to change the sectional area between the valve core and the valve seat to control the flow rate, temperature and pressure of pipeline medium. Realize automatic adjustment function.

Electric control valve is an important executive unit instrument in industrial automation process control. With the increasing degree of automation in the industrial field, it is being used more and more in various industrial management fields, widely used in electric power, chemical industry, metallurgy, environmental protection, water treatment, light industry, building materials and other industrial automation systems.

Working principle of pneumatic regulating valve

Pneumatic control valves are usually connected by pneumatic actuators, valves, positioners, etc. after installation and commissioning to form pneumatic control valves. Pneumatic control valve is to use compressed air as the power source, cylinder as the actuator, and with the help of electrical valve positioner, converter, solenoid valve, retaining valve and other accessories to drive the valve, to achieve switching or proportional adjustment, through receiving industrial automation control system control signals to complete the regulation of the flow of pipeline media Pressure, temperature and other process parameters.

Pneumatic control valve is characterized by simple control, rapid response, and intrinsic safety, no additional explosion-proof measures (electric control valve recommended to take explosion-proof measures), is one of the industrial process control instruments widely used in petroleum, chemical, electric power, metallurgy and other industrial enterprises.

Working principle of self operated regulating valve

Self-operated control valve is a control valve which operates by itself and keeps the controlled variable constant without any external power source. Self-powered control valve (self-powered control valve) relies on the pressure and temperature flowing through the valve itself as energy to drive the valve automatically, without the need for external power supply and secondary instrumentation. The self-operated control valve (self-operated control valve) uses the feedback signals (pressure, pressure difference, temperature) from the output end of the valve to drive the valve disc through the signal tube to change the valve opening to achieve the purpose of regulating pressure, flow and temperature.

Self-operated regulating valves are mainly divided into three types: self-operated pressure regulating valves, self-operated temperature regulating valves and self-operated flow regulating valves. Their characteristics are that they can work without electricity and gas to save energy. They are sensitive in action, accurate in control, high in detection and regulation accuracy.