Valve plate is a device that reduces its pressure or changes its flow and flow direction by controlling liquid or gas. Usually the valve plate is installed at the exhaust port of the bearing. Its function is to close the refrigerant in the cylinder and compress the refrigerant in the cylinder. When the compression pressure reaches a certain value, the valve plate is pressed open, and the compressed refrigerant flows from the upper bearing. exhaust vent. If there is no valve plate, then the inside and outside of the cylinder are not connected, and the compression cannot be performed. To put it simply, the port is blocked during the compression process, and the port is opened when the exhaust is performed. Its action is determined by the internal pressure of the cylinder.