Control valve arrangement with a preconditioned relief valve and a flow force compensated valve spool
US4109561A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1976 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Nov 26, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87185
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control valve arrangement is disclosed for regulating fluid communication between a source of fluid under pressure and a double-acting hydraulic motor, including a housing defining a bore, an inlet chamber in communication with the bore and the pressure source, a pair of service chambers in communication with the bore and the hydraulic motor for actuation thereof, and a plurality of drain passages in communication with the bore, a pressure transmitting circuit defined in the housing and in communication with the bore, a relief valve which is in responsive communication with the pressure transmitting circuit for variably controlling the pressure in the inlet chamber, and a spool reciprocably disposed in the bore of the housing and having a plurality of lands for blocking communication between the inlet chamber and the service chambers in a neutral position, with the spool having metering slots for communicating fluid from the inlet chamber radially outwardly to a selected one of the service chambers and to the motor for operation thereof and for communicating return fluid from the other service chamber radially inwardly to a drain passage in a working position, and with the spool …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.