Canister purge solenoid valve
US4901974A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1989 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | May 11, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K31/0696
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A canister purge solenoid valve is constructed and arranged to provide reduced operating noise and decreased armature wear as the armature reciprocates within a bore in response to solenoid energization and de-energization. The armature contains an elastomeric valve head that is biased normally closed against the valve seat. When the solenoid assembly is energized, the armature is retracted. The armature's momentum is initially absorbed by the elastomeric valve head making contact with the solenoid assembly at one end of the bore. Final absorption of the armature's momentum is shared by continuing contact of the valve head with the solenoid assembly and by an elastomeric limit stop that is disposed between the armature and the stator. In this way the elastomeric limit stop is not required to absorb the full momentum of the retracting armature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.