Self-venting drain value assembly
US4893651A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1989 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Jan 6, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86332
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A self-venting valve apparatus using a valve stem rotatably and slidably mounted to a vessel by a collar is disclosed. The stem includes threads at the top and base of the stem which matingly engage internal threads of the collar to hold the stem open or closed. A single gasket seals the gas inlet and liquid outlet in the closed configuration. To drain the fluid, the valve stem is unscrewed so the bottom threads disengage from the collar, the valve stem lowers until the top threads of the valve stem engage the collar, and the top threads are screwed to the collar to secure the valve in the open position. Fluid begins draining through the central passage of the valve stem before gas enters the vessel through the groove in the sidewall of the valve steam to allow proper siphoning. The lower end of the liquid drain passage is placed below the lower end of the air inlet groove, thereby insuring that the liquid drain passage is opened first as the valve stem is lowered. Entering air is isolated from the outgoing water by a riser wall which separates the passage from the groove. The liquid drains through the passage and then exits into a collector knob. The collector knob maintains a reg…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.