Reversing valve construction and piston head assembly therefor and methods of making the same
US4324273A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 1980 |
| Grant date | Apr 13, 1982 |
| Priority date | — |
| Expiry date | Jan 10, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86839
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A reversing valve construction having a housing provided with a movable valve member therein that is interconnected to a piston unit having opposed piston heads that define a main chamber of the housing therebetween. The housing has opposed ends respectively cooperating with the piston heads to define a pair of opposed control chambers therebetween, the ends respectively having valve seats leading to the control chambers. Each piston head has a flexible seal member secured between a front disc member and a backing plate of the respective piston head so that an integral peripheral skirt of that seal member is urged into sliding and sealing engagement with an internal peripheral surface of the housing by an annular resilient O-ring member carried by the respective piston head and radially engaging and urging its respective skirt radially outwardly into the sliding and sealing engagement. Such seal member for each piston head can be adapted to close a valve seat carried by a respective end of the housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.