Slotted closing valve for openings of containers
US6450375B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2001 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Jul 17, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D47/2031
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A slit closure valve for container openings includes a membrane member of flexible material having an at least unidirectionally aligned slit-like outlet opening and a base member peripherally surrounding the membrane member and connected to the membrane member. The outlet opening is held in its closed position by the resilient properties of the material although it is adapted to be moved into its open position against the resilient bias force of the material by a predetermined differential positive pressure exerted on one side of the membrane member. A peripheral wall portion of the base member and an adjacent wall portion of the membrane member include therebetween an acute angle of less than 90′. At least one further, substantially peripherally aligned slit-like passage opening held in its closed position by the resilient properties of the material is provided in the membrane wall portion near the base member, said passage opening being adapted to be moved into its unblocking position by a differential negative pressure exerted on the membrane member from the side thereof subjected to said predetermined differential positive pressure. The valve thereby enables the pressure …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.