Pulp bleaching tower pressure relief hatch
US4699292A · kind A · utility
11Cited by
14References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1986 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Aug 20, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An overflow hatch for confining low pressure volumes of paper pulp bleaching chemicals is provided with a double O-ring seal arrangement that sustains the hatch seal integrity as the O-ring material deteriorates from reactive effect of the bleaching chemical. The hatch seal integrity resulting from an annular clearance space extending radially between a cylindrical plug surface and an internal bore of a coaming, where the radial dimension of said annular clearance space is substantially equal to the thickness of a second O-ring tube situated in a seating groove in said plug.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.