Abstract: A valve for a plenum or pipe is disclosed. The valve includes a large butterfly valve element pivotally supported in the plenum by at least one rod. The large butterfly valve element includes an opening for accommodating a small butterfly valve element. The small butterfly valve element is coupled to the rod by a shaft. The shaft includes a recess that accommodates the small butterfly valve element but which includes a clearance between the small butterfly valve element and the shaft to permit limited rotation of the shaft before the small butterfly valve element engages at least one wall of the recess of the shaft. Thus, the combination of the shaft and the small butterfly valve element provide limited flow through the plenum. Further rotation of the shaft, however, results in rotation of the large butterfly valve element to provide greater flow through the plenum.

Abstract: A method of introducing a reducing agent into an exhaust stream may include injecting the reducing agent into the exhaust gas stream using a reducing agent injector. The method may further include selectively heating a nozzle of the reducing agent injector to reduce residue on the nozzle.

Abstract: A valve for a plenum or pipe is disclosed. The valve includes a large butterfly valve element pivotally supported in the plenum by at least one rod. The large butterfly valve element includes an opening for accommodating a small butterfly valve element. The small butterfly valve element is coupled to the rod by a shaft. The shaft includes a recess that accommodates the small butterfly valve element but which includes a clearance between the small butterfly valve element and the shaft to permit limited rotation of the shaft before the small butterfly valve element engages at least one wall of the recess of the shaft. Thus, the combination of the shaft and the small butterfly valve element provide limited flow through the plenum. Further rotation of the shaft, however, results in rotation of the large butterfly valve element to provide greater flow through the plenum.

Abstract: A control system for a power system is disclosed. The control system has a first valve mechanism, a second valve mechanism, and a controller in communication with the first and second valve mechanisms. The controller is configured to direct a single electronic control signal to the first and second valve mechanisms. Actuation of the first valve mechanism is initiated in response to the value of the single electronic control signal exceeding a first threshold value, and actuation of the second valve mechanism is initiated in response to the value of the single electronic control signal exceeding a second threshold value.

Abstract: A fuel system for an engine is disclosed. The fuel system has a common source of pressurized fuel, at least one injection device, an exhaust treatment device, and a regeneration device. The at least one injection device is configured to inject fuel from the common source into a combustion chamber of the engine. The exhaust treatment device is configured to remove particulate matter from an exhaust flow of the engine. The regeneration device is configured to inject fuel from the common source into at least one of the exhaust treatment device and the exhaust flow.

Abstract: A method of introducing a reducing agent into an exhaust stream may include injecting the reducing agent into the exhaust gas stream using a reducing agent injector. The method may further include selectively heating a nozzle of the reducing agent injector to reduce residue on the nozzle.

Abstract: A fuel system for an engine is disclosed. The fuel system has a common source of pressurized fuel, at least one injection device, an exhaust treatment device, and a regeneration device. The at least one injection device is configured to inject fuel from the common source into a combustion chamber of the engine. The exhaust treatment device is configured to remove particulate matter from an exhaust flow of the engine. The regeneration device is configured to inject fuel from the common source into at least one of the exhaust treatment device and the exhaust flow.