Tempered water mixing system
US5350112A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 3, 1993 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Nov 3, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2562
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A tempered water mixing system for applications such as emergency drench shower and eyewash stations, wherein the mixing system includes back-up control valves to ensure a substantial water flow without risk of user scalding in the event of malfunction of a main thermostatic mixing valve. The main mixing valve thermostatically blends cold and hot water supplies to provide a tempered discharge outflow at a selected temperature. A temperature limit control valve detects the discharge outflow temperature and responds to an excess temperature condition to modulate hot water flow in a manner reducing discharge temperature. A flow limit control valve detects the pressure differential between the discharge outflow and the cold water supply, and responds to a low flow condition represented by a high pressure differential to permit a make-up bypass flow of cold water past the main mixing valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.