Reversing valve construction and parts therefor and methods of making the same
US4213483A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1978 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | Nov 13, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86726
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A reversing valve construction having a housing provided with a chamber carrying a movable piston-like valve member therein that controls ports of a valve seat of the housing through the relative position of a cavity of the valve member relative to the ports. The ports comprise first, second and third ports disposed in spaced apart and straight line relation and the cavity bridges the first and second ports while exposing the chamber to the third port when the valve member is in one position thereof and bridges the second and third ports while exposing the chamber to the first port when the valve member is in another position thereof. A flexible sealing annular member is disposed between the valve member and the valve seat and surrounding the cavity to seal the cavity of the valve member to the valve seat while permitting sliding movement therebetween. A biasing member is operatively associated with the valve member and the flexible sealing member to urge and flex the sealing member into sealing engagement with the valve seat so as to tend to sealingly conform the flexible sealing member to the contour of the valve seat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.