| 摘要 |
PROBLEM TO BE SOLVED: To provide a cheap hydraulic check valve for medical equipment by which liquid in a liquid container can be prevented from leaking from a ventilation passage with a simple structure. SOLUTION: This valve is provided on a ventilation passage 4 for supplying the outside air to a liquid container, in order to prevent the liquid in the liquid container 4 from leaking. In this valve, a communication hole 7 for communicating the ventilation hole 7 and the outside air and a valve seat 9 provided on the communication hole 7 side so as to surround the communication hole 7 are provided. The valve is also provided with a sheet-like valve body 10 which is provided peelably freely on the bottom surface 9a of the valve seat 9 and is bonded on the bottom surface 9a of the valve seat 9 when the liquid flows backward and peels off from the bottom surface 9a of the valve 9 when the ventilation passage side 4 becomes at negative pressure and the outside air enters the communication hole 7, and a supporting body 11 for supporting the sheet-like valve body 10 which is provided so as to protrude from the ventilation passage 4 side into the valve 9 and is peeled off form the bottom surface 9a of the valve seat 9. The sheet-like valve body 10 is made of a synthetic resin having a self-supporting characteristic. An adhesive layer is provided on the bottom 9a of the valve seat 9. |
