Fluent material handling – with receiver or receiver coacting mea – With signal – indicator – recorder – inspection means or exhibitor
Patent
1979-11-19
1981-11-17
Bell, Jr., Houston S.
Fluent material handling, with receiver or receiver coacting mea
With signal, indicator, recorder, inspection means or exhibitor
1375195, 200 81R, 200277, B67D 532
Patent
active
043006019
ABSTRACT:
A removable vacuum indicator valve, horizontally affixed to the outside of an evacuated container, such as a flat-plate solar energy collector, wherein a movable sphere inside the valve is positioned to open or close the valve by the force of gravity or atmospheric pressure. The sphere, in open position, indicates the loss of vacuum and completes an electrical circuit which automatically activates a pump for restoring the vacuum to the container. The vacuum indicator valve, in combination with a normally closed valve installed permanently inside the evacuated container, and a remote electrically activated vacuum pumping system, provides a simple, inexpensive method for permanently maintaining and monitoring the vacuum in the container.
REFERENCES:
patent: 1277606 (1918-09-01), Kohn
patent: 1609359 (1926-12-01), Humphrey
patent: 3661174 (1972-05-01), Cripe
patent: 3823285 (1974-07-01), Dwyer
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