Self-reliant regulating valve: with the help of the working pressure and temperature of the material itself in the flow valve as power energy to promote the gate valve automatic work, without external power supply and secondary instrument panel. This kind of self-operated regulating valve uses the feedback signal of the output end of the valve (working pressure, pressure difference, temperature). The circular stretch spring is transmitted to the actuator according to the signal tube to promote the piston valve to change the opening degree of the gate valve, so as to adjust the working pressure, total flow rate and temperature. This kind of regulating valve is divided into immediate effect type and indirect effect type two.

The immediate effect of self-operated regulating valve is also known as the elastic yellow load type, the structure of the round line compression spring has elastic elements such as: elastic yellow, metal bellows, metal bellows type temperature packet, using the basic principle of elastic force and feedback signal balance. Indirect efficacy self-reliant regulating valve, enhance a guide (pilot valve), it has the effect of the feedback signal on the feedback signal and then according to the actuator, promote the main valve piston valve fitness exercise to change the valve opening degree.

If it is a working pressure self-reliant regulator, the feedback signal is the working pressure at the inlet and outlet of the valve, which is introduced into the actuator according to the signal tube. If it is a total flow self-supporting regulator, the valve inlet and outlet have a packing (or other friction resistance equipment) by the packing on both sides of the pressure difference signal into the actuator.