Pressure control in centrifugal evaporators

Details Pressure control in centrifugal evaporators Pressure control in centrifugal evaporators

2003-10-29

2008-12-09

Lu, Jiping (Department: 3749)

Drying and gas or vapor contact with solids

Process

Gas or vapor pressure varies during treatment

C034S092000

Reexamination Certificate

active

07461465

ABSTRACT:
A method of controlling the pressure within a chamber (12) of a drying apparatus (10) from which air and vapour is removed by a pump (30), which is operated continuously during the drying process. If both of a vent valve (18) and a pressure control valve (32) is opened, air at atmospheric pressure is drawn by the pump (30) directly from the pressure control valve (32), and via the chamber (12) and a non-return valve (26) from the vent valve (18). When the pressure in the chamber (12) is to be reduced both vent and pressure control valves (18, 32) are closed to allow the pump (30) to remove air, gas and vapor from the chamber (12) via the non-return valve (26). After a required chamber pressure has been reached, the pressure control valve (32) is opened while the vent valve (18) remains closed.

REFERENCES:
patent: 5137604 (1992-08-01), Meeks et al.
patent: 5263268 (1993-11-01), Meeks et al.

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