Two-way HVAC fluid control valve
US5467960A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1994 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Jun 22, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F11/84
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A two-way fluid control valve for use in temperature controlled HVAC systems. The control valve includes an engine coolant inlet and an engine coolant outlet. A diaphragm is located between the inlet and outlet and is movable between a closed position in which it prevents coolant flow through the control valve and an open position in which it allows coolant to flow through the control valve. A pressure chamber above the diaphragm is in fluid connection with the common port of a three-way control solenoid. The inlet is in fluid connection with the normally closed port of the solenoid and the outlet is in fluid connection with the normally open port of the solenoid. In an unenergized position, the pressure chamber is maintained at a lower pressure than the coolant pressure in the outlet, allowing the diaphragm to be forced open by the engine coolant, thus allowing engine coolant to flow through the valve. In an energized mode, the pressure chamber is maintained at the same pressure as the inlet, thus allowing a spring to bias the diaphragm into a closed position in which engine coolant is prevented from flowing through the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.