Four
Two
One
Three
Transmit power
Increase the heat
Increase the volume
Reduce the pressure
Compressor - Actuator - Control valve
Control valve - Compressor - Actuator
Actuator - Control valve - Compressor
Compressor - Control valve - Actuator
Gear pump
Plunger pump
Vane pump
Internal gear pump
Actuator
Generator
Alternator
Compressor