Digital positioner for remote actuation of a control valve
US4072087A · kind A · utility
100Cited by
12References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1975 |
| Grant date | Feb 7, 1978 |
| Priority date | — |
| Expiry date | Sep 17, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8663
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A digital positioner for remote actuation of a control valve includes a double-acting actuating piston connected to the control valve and a plurality of fluid-responsive stop means disposed to either side of the actuating piston. A plurality of remotely controlled pilot valves are operatively connected to respectively control the actuating piston and selected ones of the stop means. The system is especially adapted for remotely controlling hydraulic systems having a control valve for modulated control of the system for different speeds of the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.