Control valve
US4840198A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1988 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Jan 14, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86678
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A directional control valve includes a housing with a pressure inlet port, two working ports and a vent port with one working port directly connected to the vent port and the other working port communicating with the vent port via a control piston. The control piston includes a sliding valve in the area of one working port and a seat valve in the area of the other working port. A throttle bush rotatably arranged in the housing and a throttle screw rotatable relative to the throttle bush cooperate with the control valve to modify and throttle separately and independently from each other the cross sectional ventilating areas for the working ports.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.