| 摘要 |
A pump includes a main body having upper and lower body parts that confine a chamber and an inlet, respectively, an inlet valve including a valve seat and a ball member seated movably on the valve seat to block fluid communication between the inlet and the chamber, a delivery shaft including a valve-control segment and a delivery segment that is formed with a channel to be disposed in fluid communication with the chamber, a piston disposed movably in the chamber, an elastic component disposed in the main body for providing a biasing force to move the valve-control segment of the delivery shaft away from the inlet valve, and a delivery tube operable to drive movement of the delivery shaft toward the inlet valve such that the valve-control segment forces the ball member to be seated on the valve seat.
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