Time cycle controller for pneumatic valve
US4103710A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1977 |
| Grant date | Aug 1, 1978 |
| Priority date | — |
| Expiry date | Sep 12, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86445
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention relates to an economical, reliable time cycle controller for controlling the frequency and duration of the open and close cycles of a valve which may be hydraulically activated, but which is preferably operated by pneumatic means. An electrically actuated pilot valve is employed to control the application of pressurized fluid to the pneumatic main valve. The pilot valve in turn is sequentially controlled by two electrically activated delayed release relays having the characteristic that once energized by a pulse of current, they will hold their contacts in the energized position for a period of time determined by the setting of an adjustable pneumatic timer provided on each relay. A unique circuit connection arrangement between the power source, the variable time delayed release relays, and the two energizing coils of the pilot valve effects the automatic operation of the pilot valve at a frequency determined by the time delayed release setting of one relay and for a duration determined by the timed delayed release setting of the other relay. Additionally, protective devices are provided to insure that the pilot valve will never open the main valve when the battery vo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.