Overcharge prevention arrangement
US4561940A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1984 |
| Grant date | Dec 31, 1985 |
| Priority date | — |
| Expiry date | Jul 9, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7439
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The overcharge prevention device is installed in a solvent processing plant in a vacuum evaporator of a heat exchanger. It assures that the level of the cleaning solution in the vacuum evaporator cannot randomly rise when a feed valve malfunctions. A float body of an overcharge valve extending into the vacuum evaporator exerts a pressure through a double-arm lever and a valve plunger upon a ball valve and a valve seat in normal operation and holds the overcharge valve in a closed position. As the level of the cleaning solution undesirably rises, the buoyant action of the cleaning solution acts on the float body, causing the pressure on the valve seat to diminish, and the overcharge valve opens. This permits air to enter into the vacuum evaporator through the overcharge valve. The generated vacuum collapses and the suction force employed to ingest the cleaning solution disappears. Cleaning solution is only delivered to the vacuum evaporator again when the level thereof in the vacuum evaporator has been lowered by draining residue and the malfunction of the feed valve has been eliminated, as by cleaning thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.