| 摘要 |
A low profile basket and float assembly shut-off valve for the vacuum port in medical suction apparatus is disclosed. An open-topped cup-like basket depends downwardly from a container cover below the vacuum port and has one or more upper vacuum communication passages and one or more lower fluid communication openings. The basket has a closed-top central sleeve extending integrally upwardly from the bottom thereof. A complementally configured float is disposed within the basket and is a sombrero-like-shaped member having a central upstanding crown with a peripheral brim extending laterally from the base of the crown and turned upwardly. The central crown forms a reception sleeve sliding along the basket sleeve in telescoping relation. The peripheral brim provides a floatation surface. A gap is provided between the bottoms of the float and basket in a downward open-valve position of the float to prevent liquid surface-tension impedance to upward movement of the float. The float carries a flexible disc at the top of the crown. The disc is concave towards the vacuum port. There is permitted a limited amount of post-travel of the float upwardly beyond initial engagement between the disc and the vacuum port. An annular auxiliary sealing support is provided on top of the crown below and incentric to the outer periphery of the disc.
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