Direct drive servovalve and fuel control system incorporating same
US4530487A · kind A · utility
Inventors
Key dates
| Filing date | Mar 16, 1984 |
| Grant date | Jul 23, 1985 |
| Priority date | — |
| Expiry date | Mar 16, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B13/0446
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A small, light-weight direct drive servovalve includes a force motor with a stationary magnet structure and a moving coil with the moving coil coupled to a valve spool by means of a lever mechanism which is pivotally mounted on a pivot hub and which amplifies the actuating force exerted on the valve spool. The moving coil is suspended from the pivot hub by dual convoluted spring diaphragms and through the lever mechanism imparts a linear, reciprocating movement to the valve spool. A tandem valve spool and sleeve assembly is employed and provides for two separated hydraulic systems in a common housing. A fuel metering system for a gas turbine engine utilizing such a direct drive servovalve is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.