The regulator plays an important role in the automatic control of modern factories, whose production depends on the proper distribution and control of the flowing medium. These controls, whether energy exchange, pressure reduction or simple container feeding, require some final control element.
The regulator ACTS as a variable resistance in the pipeline. It changes process fluid manual control valve laminar flow to provide a pressure drop caused by changing valve resistance or "friction." This pressure reduction process is often referred to as "throttling". For a gas, it is close to an isothermal adiabatic state, depending on the non-ideal degree of the gas (joule-thomson effect). In the case of liquids, the pressure is consumed by turbulent or viscous friction, both of which convert the pressure into heat energy, resulting in a slight increase in temperature.
A common control loop consists of three main parts. The first part is the sensor, which is usually a transmitter. It is a device that can be used to measure the process parameters to be adjusted, such as pressure, liquid level or temperature. The output of the transmitter is sent to the regulator, which determines and measures the deviation between the given value or expected value and the actual value of the process parameter, and one by one sends the correction signal to the final control element, the regulator valve. The valve changes the flow rate of the fluid so that the process parameters meet the expected value.
The regulating valve belongs to the control valve series, the main function is to adjust the medium pressure, flow rate, temperature and other parameters, is the final control element in the process loop.