High pressure hydraulic flow control valve
US4825909A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1988 |
| Grant date | May 2, 1989 |
| Priority date | — |
| Expiry date | Feb 24, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87861
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A high pressure hydraulic flow control valve is formed with a spool which is capable of operating as a conventional spool to control the flow of fluid from an input port to an output port or to a return port. The spool also provides overload protection which will permit fluid to pass from the input port directly to the return port when an overload pressure condition exists in the fluid supply line. In alternative structure, the overload pressure release system may be incorporated into the valve which is used to control the return of fluid from the output port to the return passage. The high pressure hydraulic flow control valve is formed from a die-cast housing and has hardened seats mounted in access passages so as to bear against a seating shoulder. Preferably, a retaining sleeve is mounted in the access passage to bear against the hardened seat to retain it against the seating shoulder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.