Distillation: apparatus – Apparatus – Systems
Patent
1975-01-23
1977-01-11
Tayman, Jr., James H.
Distillation: apparatus
Apparatus
Systems
159DIG12, 202185R, 202180, 202179, 202181, 137428, 203 84, 176 37, 176 14, B01D 130
Patent
active
040025365
ABSTRACT:
A float valve arrangement is disposed in a mixing condenser that is arranged intermediate the first and second stage of a two-stage evaporation installation suitable for purifying radio-active liquids. In normal operation, vapor evaporated in the first stage extends via a first conduit into the mixing condenser where such vapor is condensed by contact with a portion of the liquid in the second stage that is circulated back to the mixing condenser via a pump. The normal vapor pressure generated in the first stage keeps the float valve open and permits the steam to displace, into the second stage, liquid present in the mixing condenser. During start-up and shutdown of the installation wherein vapor from the first stage is no longer present, the resulting rise in liquid level in the mixing condenser causes the float valve to close and to prevent any backflow of liquid into the first stage via the first conduit.
REFERENCES:
patent: 2568506 (1951-09-01), Mercer
patent: 3461460 (1969-08-01), McGrath
patent: 3481835 (1969-12-01), Carnavos
patent: 3875988 (1975-04-01), Machida et al.
Tayman, Jr. James H.
Vereinigte Edelstahlwerke Aktiengesellschaft
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