Plastic needle valve
US5083749A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1991 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Jan 29, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K41/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A plug-type, rising stem needle or shut-off valve for controlling fluid flow comprises a valve housing forming a valve chamber with inlet and outlet ports connecting therewith. A bonnet member with a cylindrical passage joins with the valve chamber and opens to the exterior of the valve. A plug valve element is mounted in the chamber and adapted to be moved by an operating stem axially movable within the cylindrical passage. The stem includes a radially extending guide flange. For sealing about the operating stem and limiting the axial outwardly movement of the stem there is an assembly which includes a wall surface that defines a conical chamber at the outer end of the cylindrical passage. The conical chamber tapers from a large diameter at the axial outer end to a smaller diameter at the axial inner end. At the axial inner end of the conical chamber is a cylindrical counterbore carrying a stop ring which forms a radial shoulder for engaging the flange on the stem at a predetermined outer limit position. The stop ring has an axial outer end surface that defines a continuation of the conical chamber. A sealing ferrule is positioned in the conical chamber. The ferrule has a continuo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.