Solenoid-actuated drain valve
US4336821A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1980 |
| Grant date | Jun 29, 1982 |
| Priority date | — |
| Expiry date | Oct 8, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86405
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A solenoid-actuated drain valve for a compressed gas reservoir of a diesel locomotive in which the valve element is a differential piston exposed on opposite faces to reservoir pressure for normally holding the valve closed and minimizing the opening force required to be exerted by the solenoid, a temperature-responsive heating element protects the valve against freezing, a sensing element senses accumulations of water from the compressed gas in the reservoir, and actuation of the heater and energizing of the solenoid for opening the valve are both controlled by a solid state circuit which prevents opening of the valve except when the sensing element senses accumulated water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.