Expansion and check valve combination
US4964567A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1989 |
| Grant date | Oct 23, 1990 |
| Priority date | — |
| Expiry date | Feb 10, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87555
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
This combination expansion valve and check valve (18) includes a valve body (22) having an inlet (24) and a outlet (26). A control valve (28) is disposed between the inlet and the outlet which controls flow through the valve when refrigerant flow is normal and pressure is higher at the inlet than the outlet. A by-pass conduit (60) is connected between the inlet and the outlet and includes an external conduit (62) and a passage (70) within the valve communicating with the outlet. A check valve (58) is disposed within the passage which selectively blocks flow through the conduit. The check valve includes a floating disc (66) moving between spaced check valve ports (61, 63) to block flow through the conduit when the expansion valve is operating and to permit flow through the conduit when flow is reversed. Two identical valves (18a) and (18b) are reversely connected to tandem to operate alternatively as expansion valves in a heat pump system (10).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.