Conveyors: fluid current – With means to control conveying fluid or movement of load in... – Control of conveying fluid
Reexamination Certificate
2007-07-27
2010-06-22
Dillon, Jr., Joe (Department: 3651)
Conveyors: fluid current
With means to control conveying fluid or movement of load in...
Control of conveying fluid
C406S030000, C406S144000, C406S151000
Reexamination Certificate
active
07740423
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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Newbolt Richard E.
Thorn Jonathan
Dillon, Jr. Joe
Hovey & Williams, LLP
MAC Equipment, Inc.
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