Hydraulic holding valve
US4727792A · kind A · utility
22Cited by
3References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1986 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Apr 7, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7774
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulically controllable, leakproof holding valve is disclosed, and which is adapted to be attached in the lifting hydraulic line leading to a working cylinder or the like. The holding valve includes a slidably mounted control piston, which functions as a controlled non-return valve during periods when the working cylinder is stationary or being lifted, and the piston also functions as a throttling valve during periods when the working cylinder is being lowered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.