PISTON PUMP FOR FILLING SPRAY CAN

摘要

PROBLEM TO BE SOLVED: To provide a piston pump for filling a spray can preventing leakage of liquid such as sprayed liquid to the outside with simple structure.

SOLUTION: The piston pump comprises: a cylinder 20; a piston 21 slidably disposed in the cylinder 20; and a piston drive mechanism 23 reciprocatively driving the piston 21 through a piston rod 22. A discharge valve 29 is disposed above the cylinder 20 to communicate with the outside, and a piston rod insertion hole 24 with air-tightness holding means in which the piston rod 22 is slidably inserted, and an intake valve 25 communicating with the outside are disposed below the cylinder 20. The piston 21 has a one-way valve 36 closed when the piston 21 rises and opened when the piston 21 descends.

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