Patent ID: 9092038
Filing Date: 2015-07-28
Classification: F16K,G05D,Y10T

Abstract:
1. A variable flow device comprising: a body in an air damper, the body supporting a first orifice and a second orifice, the first orifice being an air supply orifice connected with an air supply and the second orifice being an exhaust orifice connected to exhaust to atmosphere, the body configured to connect the air supply orifice and the exhaust orifice with a duct of the air damper; a drive mechanism configured to control air flow to the duct; a first valve actuator coupled to the drive mechanism and linearly shiftable between a first open position and a first closed position, the first valve actuator comprising: a first valve stem including a first conical portion, wherein the first conical portion is sized to symmetrically engage the first orifice when the first valve stem is shifted to the first closed position; and a second valve actuator coupled to the drive mechanism and linearly shiftable between a second open position and a second closed position, the second valve actuator comprising: a second valve stem including a second conical portion, wherein the second conical portion is sized to symmetrically engage the second orifice when the second valve stem is shifted to the second closed position; and wherein the drive mechanism is configured to direct the first conical portion to control the first valve actuator and the second conical portion to control the second valve actuator, the drive mechanism being responsive to a building automation controller.