Pressure vacuum relief valve assembly
US3937358A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1974 |
| Grant date | Feb 10, 1976 |
| Priority date | — |
| Expiry date | Sep 9, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D51/1644
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A pressure vacuum relief assembly for a container includes a housing with a first port in communication with the container and a second port in communication with atmosphere; the housing encloses improved vacuum and pressure relief valve means including first and second diaphragm members each having central openings therein engageable with conical surfaces on vacuum relief and pressure relief seal members; said first and second diaphragms form a control chamber in communication with the first port which is selectively pressurized to cause selective snap movement of each of the diaphragms to control flow across the seal members between atmosphere and the container.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.