IN THE FIGURE ABOVE WE CAN SEE THAT THE LUBE OIL PUMP IS SUPPLYING OIL TO THE UNLOADER. BUT DURING START THE SUCTION VALVES ARE ALREADY UNLOADED. NOW WHEN SOLENOID VALVE GETS OPERATED DUE TO THE INCREASE IN LOAD OF THE AIR CONDITIONER, THE OIL ENTERS THE LEFT SIDE OF THE REGULATING PISTON AND MOVES IT RIGHT AGAINST THE SPRING FORCE AND ALLOW THE OIL TO GO TO THE UNLOADER ASSEMBLY. THE PISTON MOVES UP AND HENCE THE YOKE MOVES DOWN. THIS MAKE THE UNLOADER LIFT RING TO GO DOWN AND THE SUCTION VALVE GO DOWN AND CYLINDER GETS LOADED.
SIMILARLY WHEN SOLENOID CLOSES THE FORCE AGAINST THE SPRING CEASE TO FUNCTION AND SPRING MOVES TO LEFT AND THE OIL IN LINE GOES OUT OF THE DRAIN AND SUCTION VALVE GETS UNLOADED AGAIN.