Water softener control valve with removable seal stack
US6402944B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Sep 21, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87249
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A seal stack, configured for supporting, guiding, and sealing a piston of a water softener control valve or the like, can be preassembled prior to its insertion into the associated valve bore and compressed after it is inserted into the bore. This post-assembly seal stack compression assures reliable assembly of the seal stack, facilitates valve assembly and disassembly, and negates the need to hold tight tolerances in bore diameter design and seal diameter design. The seal stack includes a plurality of static seals, a plurality of dynamic seals which are either combined with or separated from the static seals, and a plurality of spacers that support the seals. Each of the static seals is disposed between two adjacent spacers and seals against a peripheral surface of the bore, and each of the dynamic seals is disposed between two adjacent spacers and seals against the piston. Each of the spacers is connected to an adjacent spacer by a lost motion connector that permits limited axial movement therebetween and axial compression of the seal stack when the seal stack is assembled into the bore. Each of the static seals compresses axially and expands radially upon axial compression of t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.