Force balanced valve spool
US3990477A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1976 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Jan 30, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8671
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A flow control valve includes a valve body defining a main bore and a cross-drilled bore communicating therewith. A valve spool is reciprocable within the main bore and includes first and second lands connected by a reduced diameter connecting portion. The connecting portion has fixed relative thereto and thereabout an annular rib, positioned between the two lands. The rib acts as a guide to direct fluid substantially perpendicular to the axis of reciprocal motion of the spool when the spool is positioned to allow fluid flow between the main and cross-drilled bores, to minimize fluid flow forces tending to hold the spool in an open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.