It works the same principle and piston pump. Is to use the movement of the piston to discharge the air in the cartridge, resulting in pressure difference between inside and outside, leaving the liquid pressure rise in the liquid from the discharge tube outside the tube. When the liquid pipe is pressed down by hand, the spring is compressed so that the inlet valve (circular plastic ball) closes downwards, and at the same time as the piston moves downward, the exhaust valve (the hole below the piston) Open, the liquid in the cartridge out of the tube out of the tube; when used to release, the spring to restore the original state of nature, making the piston move up, the exhaust valve closed, the inlet valve open, the role of atmospheric pressure , Fluid enters the reservoir from the conduit through the inlet valve. This piston reciprocates up and down in the cylinder, constantly sucking liquid out of the bottle.
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