System for preventing cavitation in an hydraulic pump
US5292234A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 1993 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | May 3, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C14/26
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a positive displacement hydraulic pump (68), a system for preventing cavitation includes a regulator valve, a valve spool (74) formed with control lands (76,78) moveable within a bore (72) communicating with control pressure taken at an inlet port (100) and control pressure at a reservoir inlet port (62). The spool opens and closes a connection between the inlet port (96) and outlet port (90) in accordance with changes in differential pressure between the reservoir (atmospheric pressure) and pressure in the inlet port (100). When the differential pressure is low, the valve closes the connection; when the differential pressure is large, the valve opens the connection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.