Rely on the valve itself through the valve pressure, temperature as an energy-driven valve automatically work, no external power supply and secondary instrument. This self-regulating valve is the use of the valve feedback signal output (pressure, pressure, temperature) through the signal pipe to the actuator drive valve to change the valve opening, to regulate the pressure, flow, temperature purposes. This valve is divided into direct and indirect effects of two. Direct action, also known as spring-loaded, the structure of elastic elements such as: pieces of spring, bellows, bellows-style temperature package, the use of elastic force and feedback signal balance principle. Indirect-acting control valve, an increase of a pilot (pilot valve) It plays a role in amplifying the feedback signal and then through the implementing agencies, driving the main valve disc movement to achieve the purpose of changing the valve opening. In the case of a pressure regulator, the feedback signal is the outlet pressure of the valve and is introduced into the actuator via the signal line. In the case of a flow control valve, an orifice (or other resistance device) at the outlet of the valve removes the pressure difference signal from both ends of the orifice to the actuator. If it is a thermostatic valve, there is a temperature sensor (or warm bag) at the outlet of the valve to drive the actuator through the thermal expansion and contraction of the medium in the temperature sensor.
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