Valve stem driving apparatus
US5224512A · kind A · utility
22Cited by
6References
14Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 5, 1992 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Jun 5, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8242
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve stem driving apparatus comprises a valve stem which has first and second ends, the second end being connected to a valve body. The valve stem is engaged with a stem nut. A distance measuring device is provided in an upper cover for the valve stem and measures a distance between the upper cover and the first end of the valve stem, so that wear rate of the valve stem and/or the stem nut is determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.