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Definition of regulating valve

by:Lianke Valve     2022-04-15
In the field of industrial automation process control, the regulating valve is the final control element that changes the process parameters such as medium flow, pressure, temperature, liquid level, etc. by means of power operation by accepting the control signal output by the regulating control unit. Generally composed of actuators and valves. According to the stroke characteristics, the regulating valve can be divided into straight stroke and angular stroke; according to the power used by the actuator, it can be divided into three types: pneumatic regulating valve, electric regulating valve and hydraulic regulating valve; according to its functions and characteristics There are three types of linear characteristics, equal percentage characteristics and parabolic characteristics. The regulating valve is suitable for air, water, steam, various corrosive media, mud, oil and other media. English name: control valve, the tag number usually starts with FV. Commonly used classification of regulating valve: pneumatic regulating valve, electric regulating valve, hydraulic regulating valve, self-operating regulating valve. In the automatic control of modern factories, regulating valves play a very important role, and the production of these factories depends on the correct distribution and control of the flowing medium. Whether these controls are energy exchanges, pressure reductions, or simple vessel filling, certain final control elements are required. The regulating valve acts as a variable resistance in the pipeline. It alters the turbulence of the process fluid regulator or in the case of manual regulator laminar flow provides 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 isothermal adiabatic state, the deviation depends on the degree of non-ideality of the gas (Joule-Thomson effect). In the case of liquids, the pressure is dissipated by turbulent flow or viscous friction, both of which convert the pressure into heat, resulting in a slight increase in temperature. A common control loop consists of three main parts. The first part is the sensitive element, which is usually a transmitter. It is a device that can be used to measure adjusted process parameters such as pressure, level or temperature. The output of the transmitter is sent to the regulating instrument - the regulator, which determines and measures the deviation between the setpoint or expected value and the actual value of the process parameter, and sends the correction signal one by one to the final control element - the regulating valve. The valve changes the flow of the fluid to bring the process parameters to the desired values. The regulating valve belongs to the series of control valves. Its main function is to adjust the pressure, flow, temperature and other parameters of the medium, and it is the final control element in the process loop.
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