Hydraulic safety brake valve arrangement for load lowering
US4972761A · kind A · utility
12Cited by
5References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1988 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Dec 16, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B13/01
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic safety brake valve arrangement for a motor controlled by a directional control valve. The safety brake valve arrangement has a main valve closing the load lowering conduit in a rest position. Pump pressure opens the main valve to throttle exhausted fluid and at the same time throttle fluid through the supply conduit to the opposed motor chamber. A compensating valve is placed in series with the main valve throttle for the loaded side of the motor. Motor speed is thereby controlled independent of the external loading on the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.