Pressure compensating valve, unloading pressure control valve and hydraulically operated device
US6334308B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1999 |
| Grant date | Jan 1, 2002 |
| Priority date | — |
| Expiry date | Mar 3, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/71
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pressure compensating valve (7) comprises a main valve (20) that is operated in such a way as to increase the area of the opening between an inlet port (24) and an outlet port (25) by means of pressure acting on a first pressure receiving component (21). The pressure compensating valve (7) is also operated in such a way as to reduce the area of the opening by means of pressure acting on a second pressure receiving component (22) and pressure acting on a third pressure receiving component (23). The pressure compensating valve (7) is designed to allow the pressure (Pa) of the pressurized oil flowing to the inlet port (24) to act on the first pressure receiving component (21) and the pressure (Pb) of the load driven by the pressurized oil flowing from the outlet port (25) to act on the second pressure receiving component (22). A control pressure producer (7B) is provided for allowing control pressure (Pe) resulting from a reduction in the pressure (Pa) of the inlet port (24) to act on the third pressure receiving component (23). An unloading pressure control valve and an variable bleed valve can also be provided. This structure allows the pressure compensated characteristics to be c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.