Valve assembly
US7178787B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 2005 |
| Grant date | Feb 20, 2007 |
| Priority date | — |
| Expiry date | May 5, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K15/025
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An improved valve assembly (100) includes a primary spring (142) which extends along a valve stem (144). A spring retainer (150) holds the primary spring (142) on the valve stem (144) and has a thread convolution (152) which engages a thread convolution (154) on the valve stem (144). The spring retainer (150) has a force transmitting surface (182) which engages a reference surface (184) on the valve stem (144) with a retainer preload force which is at least as great as a primary spring preload force. Shims (158–162) are provided between the primary spring (142) and the spring retainer (150) to enable a desired primary spring preload force to be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.