Differential piston type reversing valve construction, system utilizing the same and method of making
US4248058A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1979 |
| Grant date | Feb 3, 1981 |
| Priority date | — |
| Expiry date | Apr 4, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86839
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A differential piston type reversing valve construction having a housing body provided with a high pressure chamber that has a valve member slideable therein for selectively interconnecting said high pressure chamber to either port of a pair of ports interrupting a valve seat of the housing body while interconnecting a low pressure port of the valve seat to the other port of the pair of ports, the valve member having a small piston member and a large piston member interconnected thereto and being disposed spaced from each other to define an intermediate chamber therebetween. The small piston member has one side thereof exposed to the high pressure chamber and the large piston member has one side thereof exposed to a control chamber of the housing body. The valve construction is provided with means for effectively interconnecting the high pressure chamber to the intermediate chamber and the low pressure port to the control chamber to cause the valve member to slide to one position thereof in the high pressure chamber. Such means is also adapted to effectively interconnect the high pressure chamber to the control chamber and the low pressure port to the intermediate chamber to cause …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.