Boltless bonnet assembly for gate valve
US4968002A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1989 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | May 3, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K27/04
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A boltless bonnet assembly is provided for use with a valve, particularly a gate valve having a valve body comprising an upper housing, a lower fluid passageway, a gate, and a valve stem having a thrust washer. The bonnet assembly has a bonnet with a lower plate adapted to sealingly engage an underside of a lip of the upper housing, the lip defining an opening in the upper housing, and a cylindrical neck having inner and outer sets of threads at an upper portion. A bonnet clamp or alternatively a lock ring and clamp ring are provided to engage the outer threads of the bonnet to clamp the plate tightly against the underside of the lip, and a bonnet cover is provided for retaining the thrust collar of the valve stem in a recess in the bonnet, the bonnet cover being threaded into the set of inner threads of the bonnet. The bonnet cover is further provided with a seal flange and associated gasket which is compressed between the flange and an upper surface of the bonnet neck to seal the threaded connections from an outside environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.