Weight controlled valve
US5236010A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1992 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | May 20, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8242
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A pressure regulating valve 10 is provided in a housing 11 filled with oil 23 and having an inlet port 12 and an outlet port 13. A straight elongate vertical tube 14 having a lengthwise slot 19 near its lower end 15 is affixed to the housing and communicates with the inlet port. Closely fitting down into the tube is a piston 16, slidable between a lower position 29 with its lower end 17 below the slot and a substantially higher upper position. A coaxial annular weight 22, surrounding upper portions of the piston and the tube, is affixed to the piston to exert a downward force thereon by virtue of the gravitational attraction of the weight to the earth. When oil is supplied under pressure to the inlet port, the oil presses upward, and the weight presses downward, against the piston; and when the lower end of the piston is at a level between the ends of the slot, the oil flows in from the inlet port, through the open portion of the slot, into the other space in the housing, and out through the outlet port, at a substantially constant predetermined pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.