Pressure relief valve with moving diaphragm
US6024120A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1998 |
| Grant date | Feb 15, 2000 |
| Priority date | — |
| Expiry date | Sep 25, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7834
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A valve for relieving an excess negative pressure condition inside a medical device comprising a diaphragm with an inner periphery and an outer periphery and an actuator having a piston extending axially therefrom which is inserted through the inner periphery of the diaphragm. The piston comprises a plurality of legs that form a void therebetween at the free end thereof. The outer periphery of the diaphragm is sandwiched between the upper and lower housings so as to create a hermetic seal that separates the valve into a venting side and a suction side. To relieve an excess negative pressure condition the diaphragm is operable in one of two positions. In the first position, a biasing members forces the inner periphery of the diaphragm in sealing engagement around the circumference of the piston so that a hermetic seal is maintained between the suction side and the venting side. When negative pressure inside the medical device begins to rise, the inner periphery of the diaphragm moves in sealing engagement along the piston so that a constant sealing force is applied around the circumference of the piston until it reaches the plurality of legs at the free end thereof. As the inner per…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.