Vacuum modulating air control valve apparatus
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United States of America Patent
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Jun 22, 2010
Grant Date -
Jan 31, 2008
app pub date -
Jul 27, 2007
filing date -
Jul 27, 2006
priority date (Note) -
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Abstract
A vacuum modulating air control valve includes a valve body with air intake ports, an output port, and a valve throat. A valve member is slidably mounted within the valve body between open positions relative to the valve throat and a closed position, to which the valve member is urged by a valve spring. A pneumatic cylinder has a piston forming a vacuum chamber and has a piston rod connected to the valve member. The output port is connected to a feedpoint of a vacuum conveying system, and the vacuum chamber is connected to a vacuum line communicating with the vacuum conveying system. A vacuum level within the vacuum chamber retracts the valve member from the throat, thereby admitting ambient air into the vacuum conveying system to control a material-to-air ratio within the system.
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