Hot/cold water mixing device
US4739923A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1987 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Jul 31, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/1393
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A hot/cold water mixing device includes a hot water supply valve disposed in a hot water feed pipe for regulating the amount of hot water passing therethrough, a cold water supply valve disposed in a cold water feed pipe for regulating the amount of cold water passing therethrough, a water mixture pipe connected between the hot and cold water feed pipes and a water outlet, and a control mechanism for controlling an actuating mechanism to open and close the hot and cold water supply valves complementarily to each other. The control mechanism has a mechanism for storing a plurality of characteristics including, at least, a first characteristic having a relatively small gain with respect to the difference between a desired temperature for water discharged from the water outlet and the temperature of water in the water mixture pipe, and a second characteristic having a relatively large gain with respect to the difference, a characteristic selecting and maintaining mechanism for selecting and maintaining the second characteristic when the absolute value of the difference exceeds a relatively large value and for selecting and maintaining the first characteristic when the sign of the diff…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.