Electromagnetically controllable spray valve and spray system
US4557420A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1983 |
| Grant date | Dec 10, 1985 |
| Priority date | — |
| Expiry date | Sep 2, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62C37/10
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The spray valve comprises a cylindrical component having a central passage, which body is slidingly disposed in a widened portion of the valve body. The cross-sectional area of the central passage is smaller than that of the widened portion, so that the cylindrical component is displaced outwardly against the return force of a spring by the flow occuring when the spray valve is opened. A permanent magnet is embedded in the wall of the cylindrical component. In the wall of the valve body surrounding the widened portion thereof there is a blind bore in which a reed contact is inserted. Through the flow of liquid occuring when the spray valve is opened, the magnet is displaced into the field of response of the reed contact, which thus indicates the opening of the spray valve. This spray valve is intended to be utilized in a system for spraying a thawing agent. A plurality of control circuits are disposed along a roadway, one of the spray valves being associated with each control circuit. The reed contacts make possible a remote indication of the operating readiness of the individual spray valves, making the spraying system much more reliable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.