High temperature balanced valve trim
US4712769A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 1986 |
| Grant date | Dec 15, 1987 |
| Priority date | — |
| Expiry date | Aug 29, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K3/243
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The disclosure is directed to a seal forming means in a valve plug for use in a fluid control valve, particularly in high temperature and high pressure fluid applications. The valve plug of the invention generally comprises a main valve plug member and a seal forming member associated therewith. The seal forming member is axially aligned with the main valve plug member and includes an outer wall having a surface that is coincident with an imaginary surface extension of the outer surface of the main valve plug. The seal forming member comprises a durable material having predetermined resilient characteristics, whereby said seal forming member is resiliently compressible within a predetermined range of compression. Moreover, the seal forming member includes an interior space and a finite section of minimum wall thickness formed in the outer wall. A packing material is tightly received and compressed within said interior space and, means are provided for compressing the seal forming member upon valve shut off. In this manner, the seal forming member is resiliently compressed within its predetermined range of compression to thereby compress and urge the packing material toward the fini…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.