Non-flowing pilot valve
US6386227B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2000 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | Sep 14, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7769
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A non-flowing pilot valve is disclosed having a sense piston assembly (16) and a feedback sleeve (40) co-axially mounted within a valve body (12). A dome-line chamber (32) and an exhaust-line chamber (34) are isolated from each other by a feedback sleeve top shoulder (48) contacting a pop seal (52) on the valve body (12) below set pressure. At a few percentage points of inlet (19) pressure below set pressure, a reseat seal of a foot (20) portion of the sense piston (16) contacts the bottom shoulder (48) of the feedback sleeve (40) thereby closing off the dome-line chamber (32) from below and above and “locking in” dome line pressure. An increase in inlet (19) pressure above set pressure causes the sense piston (16) to move up simultaneously carrying feedback sleeve (40) with it thereby opening the dome-line chamber (32) to the exhaust-line chamber (34) below the open top shoulder (48).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.