Milking: When the piston descends, the ball valve on the piston pump is closed, and the ball valve on the gas tank is opened. A vacuum is generated in the closed milk bucket and milking parts. The inner sleeve of the milk cup and the inner wall of the milk are the same pressure, so The milk cup is opened, and the milk is sucked from the teat, collected in the milk collector, and drawn into the milk bucket.
When the piston moves up, the spherical valve on the piston pump automatically opens, and the atmosphere enters the wall compartment, and the spherical valve on the gas tank automatically closes, so that the closed milk bucket and the inner sleeve of the milk cup are in a vacuum state. A pressure difference is formed between and the wall compartment, so that the inner sleeve of the milk cup is closed and the milk flow stops. The piston goes down at 64 times per minute, and the up work has been completed.