| 摘要 |
PROBLEM TO BE SOLVED: To provide a horizontal bellows pump enhancing liquid replaceability by switching discharge steps and suction steps.SOLUTION: In a horizontal bellows pump constituted by attaching discharge side check valves 7 for sending liquid from pump chambers 6 to a discharge passage 1 in a discharge step and suction side check valves 8 supplying liquid from a suction passage 2 to the pump chambers 6 in a suction step to a pump head 3 so as to protrude to the pump chambers 6, suction holes 76 opening to upper side pump chamber parts 61 being areas directly above the discharge side check valves 7 are arranged in valve cases 71 of the valves 7, valve exit passages 82 of the suction side check valves 8 are opened to lower side pump chamber parts 62 being areas directly under the valves 8, liquid A of the upper side pump chambers 61 is sucked from the suction holes 76 in the discharge step, the liquid A is ejected from the valve exit passages 82 to the lower side pump chamber parts 62 in the suction step, thereby to prevent stagnation of the liquid A in both the pump chamber parts 61, 62. |
