Method and flushing for removing hydraulic fluid from hydraulic systems
US4396436A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1981 |
| Grant date | Aug 2, 1983 |
| Priority date | — |
| Expiry date | Jul 20, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0419
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for removing residual hydraulic fluid from hydraulic systems employing a flushing fluid comprising a thickening agent dissolved in an organic solvent having a boiling point below about 125.degree. C. After draining fluid from a hydraulic system, flushing fluid is injected into the system and circulated to dissolve residual fluid. The flushing fluid, containing dissolved residual fluid, is then drained from the system. In a preferred embodiment, the flushing fluid comprises about one to three percent by weight ethyl cellulose dissolved in 1,1,1-trichloroethane together with about 0.1 to six percent by weight of a friction-reducing antiwear additive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.