Rotary valve for vacuum service use
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United States of America Patent
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-
Mar 5, 1991
Grant Date -
N/A
app pub date -
Apr 25, 1990
filing date -
Apr 25, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A simply constructed, inexpensively manufactured rotary valve includes a molded plastic valve body having a seat on which is received a molded plastic rotary valve cover, the underface of the valve cover having an elongate flow groove therein, that groove being encircled by another groove in which a seal is disposed. The ends of the valve cover flow groove can be registered with a circularly spaced pair of openings in the valve body seat to establish communication through the valve between an evacuation space and a vacuum producing means, these seat openings in turn leading to valve body passages that are in communication with respective ones of a pair of integrally formed nipples on the body. The nipples which extend laterally from the valve body, serve as receptive mounting locations for tubes connected to the evacuation space and vacuum producing means. Telltale means are provided on the valve cover to facilitate orienting same when connection between the evacuation space and vacuum producing means is to be made. A vent passage in the valve cover can be registered with one and/or the other of the seat openings when it is desired to bleed air into the evacuation space and/or vacuum producing means from ambient atmosphere.
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