Series spool pressure regulator arrangement for a double-acting hydraulic actuator
US4836089A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 1987 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Oct 16, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7809
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A regulator arrangement (14) for a servo system (10) having a first stage valve spool piston (44) for developing a primary operational fluid (P.sub.c) and a second stage valve spool piston (70) for developing secondary operational fluid P.sub.cr having a constant fluid pressure. A control valve (109) selectively connects a first chamber (100) of a cylinder housing bore to either the primary operational fluid pressure P.sub.c or a reference fluid pressure P.sub.B to develop a fluid pressure P.sub.x in first chamber (100) while a second chamber (102) is connected to the secondary operational fluid (P.sub.cr). A load piston (96) responds to a pressure differential (P.sub.x -P.sub.cr) by moving to either expand or contract the second chamber (102) and produce a fluid pressure (P.sub.crx) in the secondary operational fluid. The fluid pressure P.sub.crx is communicated to the second valve piston (70) to correspondingly allow either additional primary fluid (P.sub.c) to flow to the secondary chamber ( 102) or release secondary operational fluid until the secondary operational fluid pressure returns to P.sub.cr.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.