Shaft seal assembly for a rotary valve
US5368311A · kind A · utility
Inventor
Key dates
| Filing date | Apr 28, 1992 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Apr 28, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65G53/4633
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A rotary valve which is particularly useful in handling foodstuff or materials which will not tolerate cross-batch contamination, the valve including a housing having an inlet and an outlet which may be connected to a pneumatic conveying duct or the like, and having an access open end, a detachable closure means mounted on the housing for closing the opening and, a drive shaft journalled in the housing having a free end disposed between said inlet and outlet, adjacent the closure, a rotor mounted on the free end of the shaft having an annular surface engageable with the housing, the annular surface having at least one recess communicable with the inlet and outlet by rotating the drive shaft for conveying material from the inlet to the outlet, a first axial seal disposed between the housing and the rotor, and a second axial seal disposed between the rotor and the closure in substantial longitudinal alignment with the first axial seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.