known as the selector valves are designed to guide the flow of compressed air cha get an attack. This flow of air directed by valve is said pneumatic signal.
If this pressure signal is used to control the switching another said valve control signal (Fig. 1).
If this pressure signal is used to control the switching another said valve control signal (Fig. 1).
If the signal feeds the chamber of an actuator, f acendo move such as the stem of a cylinder, then it is said power signal (Fig. 2).
A circuit of pneumatic automation to perform fully its role must and use both control signals and power signals, then it must contain both control circuits and power circuits which, in the diagrams , respectively, are indicated with dotted line and solid line. Given the different function, the control signals are usually low-pressure (p c Bar = 2 approximately) while the power at high pressure (p p = 6-8 bar approximately). In both cases, however, pressure is always determined by information on the operating characteristics of valves and actuators.
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