Definition of control valve


Definition of control valve

Regulating valve is also known as control valve. In the field of industrial automation process control, it accepts the control signal output by the adjustment control unit and uses power operation to change the final control element of process parameters such as medium flow, pressure, temperature, and liquid level. Generally composed of actuators and valves. According to the characteristics of the stroke, the control 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 control valve, electric control valve, and hydraulic control valve; according to their 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 bit number usually starts with FV. Commonly used classification of control valves: pneumatic control valves, electric control valves, hydraulic control valves, self-operated control valves.

A common control loop consists of three main parts. The first part is a sensitive element, which is usually a transmitter. It is a device that can be used to measure the adjusted process parameters, such as pressure, liquid level or temperature. The output of the transmitter is sent to the regulating instrument-the regulator, which determines and measures the deviation between the given value or the expected value and the actual value of the process parameter, and sends the correction signals one by one to the final control element-regulation valve. The valve changes the flow rate of the fluid so that the process parameters reach the desired value.

The regulating valve belongs to the series of control valves. Its main function is to adjust the parameters of medium pressure, flow, temperature, etc. It is the final control element in the process loop.

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