(1) When the pump head is pressed and then released, the compressed spring pushes the piston upward and the air pressure in the space where the spring is located. The pressure in the large bottle increases the pressure through the tube and pushes the glass beads , The liquid into the space where the spring.
(2) again press the pump head, the piston down movement, the spring to suppress the glass beads to seal the nozzle, to prevent the liquid into the big bottle. Press the pump head while the piston moves up a little distance, the piston shaft on the hole exposed, the liquid through the hole to rise.
(3) Loosen the pump head again, the piston moves upwards, and the piston on the center of the piston is sealed and the liquid is sucked again. This cycle, the liquid can be squeezed out.
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