Retractable plug assembly
US6776392B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 2003 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Apr 24, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K25/04
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A retractable plug assembly for engaging a seat ring seating surface comprises a plug housing, a plug body, a retainer ring, a wear ring, a spring retainer and a valve spring. The plug housing has the plug body slidably disposed therewithin and defines a plug body seating surface. The wear ring is mounted to the retainer ring and extends downwardly therefrom to define a wear ring bottom face positioned downwardly relative to the plug body seating surface. The valve spring, captured between the spring retainer and the plug housing, biases the plug body away from the seat ring during engagement of the wear ring to the seat ring such that inwardly flowing fluid is prevented from directly impinging the plug body seating surface. The valve spring deforms during downward movement of the plug body such that the plug body seating surface engages the seat ring seating creating a fluid-tight seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.