Pressure setting device
US4241750A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1978 |
| Grant date | Dec 30, 1980 |
| Priority date | — |
| Expiry date | Nov 27, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2544
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a device in which a positive or negative pneumatic pressure source is coupled with a controlled system through a first electromagnetic valve and the controlled system is coupled with a negative or positive pneumatic pressure source through a second electromagnetic valve or opened therethrough to the air, and which is adapted so that the first and second electromagnetic valves are controlled to open or close to thereby set an air pressure in the controlled system, a deviation between the pressure of the controlled system and the set pressure is detected and the detected deviation signal is converted by a pulse converter into a pulse of the duty ratio or frequency corresponding to the deviation, by which pulse the first and second electromagnetic valves are controlled to open or close.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.