Automatic control can be divided into intermittent
control and continuous control.
Intermittent control switch control. Pneumatic control system used in the low frequency switch type (ON - OFF) of the reversing valve to control the on-off of gas path.
By the pressure reducing valve to
adjust the pressure needed to, to regulate the flow of needed by throttle valve.
The traditional pneumatic control system to want to have multiple output force
and velocity, requires multiple pressure reducing valve, throttle valve and
directional control valve.
In this way, not only are there more components need, cost is high, constitute a complex system, and many elements need to be manually adjust in advance.
Electrical proportional valve control belong to the continuous control, its characteristic is output changes over the amount of input, output and input between certain proportion relationship.
Proportional control open-loop control and closed-loop control.
