Back pressure regulator and non-return valve
US4300593A · kind A · utility
Inventor
Key dates
| Filing date | Jan 31, 1980 |
| Grant date | Nov 17, 1981 |
| Priority date | — |
| Expiry date | Jan 31, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87917
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A back pressure regulator and non-return valve is provided herein. It includes a hollow plug having an open inlet end and a closed end having a central aperture therethrough. A closure cap is hermetically slidably disposed within the hollow plug. A plurality of outlet perforations are provided from the hollow plug, the apertures being disposed along helical paths along the outer periphery thereof. Finally, a tubular resilient diaphragm sleeve of non-uniform wall thickness envelopes the apertured portion of the hollow plug, the resilient sleeve being secured to the hollow plug at its base only adjacent the open inlet end thereof. Control of the outflow through an annular outflow path between the hollow plug and the tubular resilient diaphragm to require greater gaseous pressure is provided by changing the number of the outlet apertures in the effective outlet length of the hollow plug. The threshold pressure required to move the diaphragm away from the hollow plug to provide the annular outflow path is increased, dependent on the wall thickness. Gas having a pressure lower than that threshold pressure will not flow out. Non-return function is provided by gas pressure on the outside …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.