High resolution micro-metering valve
US3985331A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1975 |
| Grant date | Oct 12, 1976 |
| Priority date | — |
| Expiry date | Jan 6, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/52
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A high resolution micro-metering valve having a non-rotary needle valve supported between a pair of calibrated coil springs of widely different spring rates. The lower rate spring is axially adjustable in minute increments by the valve actuator to vary the loading on the higher rate spring in an amount proportional to the ratio of the two spring rates. The valve actuator is free of all backlash and all relative movement with the valve packing is restricted to non-rotary axial movement. The valve proper can be contoured at will to provide linear or non-linear flow characteristics without need for any change in either of the two coil springs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.