The metering parts and the junction are divided structure, according to the oil demand of each lubrication point, choose the corresponding metering parts at will and the PV series coupling body can be freelycombined series and parallel use.Working status：1. The high-pressure grease of the main oil pipeline pushes the oil separator umbrella valve to move up under the action of pressure. 2.The umbrella valve seals the center hole of the mandrel, and the high-pressure grease in the main oil line pushes the piston to overcome the spring resistance and begins to rise, discharging the grease stored in the previous cycle. 3.The oil drain is completed when the piston moves to the apex of the upper chamber. 4.The lubrication pump stops working, the unloading valve opens by itself, the high-pressure grease of the main oil pipeline flows back through the unloading valve, the system pressure drops rapidly, the piston of the oil separator begins to recover under the action of the spring, the umbrella valve is reset and seals the oil inlet, and the piston presses the grease in the lower cavity to the upper cavity through the central hole of the mandrel, and the next oil supply is also reserved.
