Spool valve and valve seat assembly for an intermittently operable hot melt adhesive material control module
US7614529B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2006 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Dec 21, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8671
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A spool valve and valve seat assembly disposed in the control module of a hot melt adhesive dispensing system is uniquely structured so as to effectively prevent fluid communication or “cross-talk” between a first dispensing outlet port and a second recirculation port, during those periods when the control module is effectively reciprocally cycling the spool valve between its oppositely disposed extreme conditions for alternatively permitting the hot melt adhesive material to be dispensed from the first outlet port or for re-routing the hot melt adhesive material through the recirculation passage so as to prevent the hot melt adhesive from being improperly dispensed as a result of being undesirably routed to the recirculation passage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.