Reed Valve Air Injection: Operation: B2000

When exhaust system pressure pulsations are less than atmospheric pressure, reed valve is opened to incoming air. When exhaust pressure exceeds atmospheric pressure, reed valve is closed to incoming air. This valve also acts as one-way valve.

Fig 1: Schematic of B2000 (Exc. Calif.) Reed Valve Type Air Injection System

Courtesy of MAZDA MOTORS CORP.