Self draining valve member for use in underground water lines
US4953581A · kind A · utility
Inventor
Key dates
| Filing date | Aug 14, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Aug 14, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7843
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A self draining valve member for use with a water line of an underground water distribution system. The valve member comprises a cylindrical housing having screw threads formed on at least a portion of the outer surface thereof, with the screw threads being adapted to engage a threaded fitting on the water line. The housing has an inner chamber comprising first and second bores extending axially inward from the opposite ends of the housing. The chamber has a transverse wall which divides the chamber into two sub-chambers. A drain bore extends through the transverse wall to extablish flow communication between the two sub-chambers. Respective valve heads are positioned in the sub-chambers, with a valve stem extending through the drain bore and connecting the valve heads. A flange projects circumferentially from one end of the housing, and a hollow cylindrical hood extends from the flange away from the housing. Internal screw threads are formed on at least a portion of the internal surface of the hood, and a threaded plug engages the internal threads from the open end of the hood such that one end of the threaded plug can be screwed tightly against the end of the housing. An opening …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.