Patent ID: 7011081

Claim:
An emission control valve for use in an emission control system of an internal combustion engine comprising: valve body structure providing an inlet port at which flow enters the valve, an outlet port at which flow exits the valve, a valve element cooperating with a seat element for selectively restricting flow between the inlet port and the outlet port by selectively restricting flow through the seat element, an actuator for selectively positioning the valve element along an axis relative to the seat element, wherein the seat element comprises first and second valve seats axially spaced apart and the valve element comprises first and second closures axially spaced apart, each closure arranged to seat on the respective seat for closing flow between the inlet port and the outlet port and to unseat from the respective seat for allowing flow between the inlet port and the outlet port, and wherein the seat element comprises an axially extending wall that circumscribes a space between its seats and that contains plural apertures through which that space is open to one port.