| 摘要 |
PROBLEM TO BE SOLVED: To improve a reliability of a pump function by providing a plurality of guide rib-like pieces on a discharge passage inner wall face of an injection head so that a ball valve forming a discharge valve moves vertically along a center of the discharge passage. SOLUTION: When an injection head 8 is vertically moved by pushingly operating it in the case of using a fluid hollow container, since an inside of a cylinder 5 becomes negative in pressure, a valve plate 4c rises and a suction valve opens, a liquid in the container is introduced into the cylinder 5. When successively an injection head 8 is pushed down, since the inside of the cylinder 5 becomes high in pressure, and the valve plate 4c descends to close the sunction valve, the solution in the cylinder 5 pushes up a ball valve 6b to open a discharge valve, and is injected from an injection nozzle 7 through a discharge passage of a stem 6 and the injection head 8. In this case, since a rib 8b is provided to a discharge passage inner wall of the injection head 8 so that the ball valve 6b moves vertically in a central part of the discharge passage, even for a highly viscous liquid or the like the ball valve 6b is prevented from sticking to the discharge passage wall face. |
