Expansion and check valve combination
US4852364A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1987 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | Oct 23, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2600/21
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
This expansion valve includes a valve body providing an inlet chamber and an outlet chamber separated by a compound valve. The compound valve includes a check valve seat defining a valve port receiving a check valve element and the check valve element includes a control valve port receiving a control valve element. During normal refrigerant flow conditions when the pressure in the inlet chamber is greater than the pressure in the outlet chamber, the check valve remains seated while the control valve element meters refrigerant flow between the two chambers. During reverse refrigerant flow, when the pressure in the inlet chamber is less than the pressure in the outlet chamber, the check valve is urged away from the check valve seat to provide for relatively unrestricted refrigerant flow between the two chambers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.