Patent ID: 6783108
Filing Date: 2004-08-31
Classification: F02C,G05D

Abstract:
A valve actuated by a pressurized drive media for metering a primary media, the valve comprising:a body defining a piston chamber and having a nozzle passageway axially aligned with the piston chamber about a stroke axis, the body having drive media supply and return ports in communication with the piston chamber and primary media intake and exhaust ports in communication with the nozzle passageway, the piston chamber and supply and return ports being isolated from the nozzle passageway and intake and exhaust ports; a pintle extending along the stroke axis has a head sized to close off the nozzle passageway; a piston disposed in the piston chamber along the stroke axis, the piston being coupled to the pintle and having a head responsive to the drive media when pressurized to drive the pintle between an open position in which the primary media intake and exhaust ports are in communication with each other and a closed position in which the pintle head closes off the nozzle passageway such that the intake and exhaust ports are not in communication with each other; and a baffle disposed within the piston chamber so as to direct the drive media in a path adjacent the piston.