Bushing-less control valve
US6866244B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 7, 2003 |
| Grant date | Mar 15, 2005 |
| Priority date | — |
| Expiry date | Feb 7, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K41/04
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid control valve, in which the usual metal stem guide bushings have been eliminated, includes a valve bonnet and a packing nut threadably engaging the valve bonnet. A valve stem passes through the valve bonnet and the packing nut in a clearance fit so that there is no engagement therebetween. A single packing set is included, having a middle virgin PTFE sealing ring, a carbon or glass filled PTFE male packing ring on one side and a carbon or glass filled PTFE female ring on the other side. Belleville disk springs may be provided intermediate the packing nut and the packing set, for supplying live loading to the packing. The packing provides sufficient stem guidance, interference fit with the valve stem to enable the usual upper and lower metal guide bushings to be eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.