Pneumatic regulating valve
US5261447A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1992 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Nov 25, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7848
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention is an improvement in a pneumatic regulating valve of the type having a main flow path and a bleed passage. In the improvement, the bleed passage is in parallel with the main flow path and regulates a downward-trending pressure at the outlet port to prevent such pressure from diminishing or from rapidly diminishing. The valve also includes a check valve in series with the bleed passage for regulating an upward-trending pressure at the outlet port. Using a constant bleed orifice to substantially pressure-balance the check valve and a small-area protrusion on the check valve to reduce contact area, the check valve exhibits very low hysteresis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.