Four-way ball valve
US4232709A · kind A · utility
17Cited by
6References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1978 |
| Grant date | Nov 11, 1980 |
| Priority date | — |
| Expiry date | Oct 20, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86871
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A four-way ball type valve including a spherical valve element operable to as many as four positions and which can be installed on a railway car in place of the branch pipe tee to eliminate the need for an angle cock at each end of the brake pipe and a brake control valve cut-out cock. The ball valve is functionally analogous to a rotary valve in cutting off the brake pipe at either end of the car without interrupting the brake control valve connection with the brake pipe, or in cutting out the brake control valve while establishing brake pipe continuity through the train.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.