Temperature responsive, pilot operated line valve with shape memory alloy actuator
US5259554A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1992 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | May 15, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/025
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A shape memory effect actuated diaphragmatic anti-scald valve, including a valve housing having a fluid flow path therethrough and including a pilot chamber. There is a first valve seat within the housing and a second valve seat within the housing and downstream from said first valve seat. A pilot valve is located within the chamber of the valve housing for preventing fluid flow through the chamber in which the pilot valve element is located when the SME valve is in its normal flow position and a first valve element is retained seated on the first valve seat by the pilot valve. There are means for controlling the open and closed positions of the pilot valve depending upon the temperature of the fluid flowing through the SME valve. A diaphragm defines a second valve element for the second valve seat and located in the main path of flow for the SME valve and being in an open position when fluid is flowing through the normal flow path and the fluid is directed at the bottom thereof for holding it off the second valve seat the second valve element in its first position opens a port which allows water pressure on the top side of the center of the diaphragm urging it to close against the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.