2. Press repeatedly to and fro---exhaust all the air in the body;
3. Liquid suction-------Press the head by hand to pass the main column, sub-column, piston, and the common compression spring to expel the air in the body, then loosen the head. The spring loses pressure and moves back (upper ) Movement. At this time, the piston also moves down by rubbing the inner wall of the main body to close the discharge hole of the auxiliary column; at this time, the liquid storage cavity in the main body forms a vacuum suction state, and the glass ball is sucked up, and the liquid in the bottle is passed through The suction tube sucks the liquid into the liquid storage cavity of the body.
4. Store liquid ------Press the head several times, and store the liquid in the main body through repeated suction until the liquid is full.
5. Foaming-----------When the liquid in the body's liquid storage chamber is full, press the head again and the liquid will be sprayed directly from the nozzle through the discharge hole