Abstract: A valve for distributing secondary air from an engine driven pump between the engine exhaust conduit and an accessory device has a valve chamber with an inlet from the air pump and an outlet to the exhaust conduit and a pressure chamber with an outlet to the accessory device and a movable wall biased inward by a spring. A fixed wall between the valve and pressure chambers has a central opening and peripheral openings. A shaft fixed to the movable wall extends through the central opening into the valve chamber and has a valve member on its end for opening and closing the valve chamber outlet. A flexible annular sealing valve member has an inner circular bead sealingly engaging a groove in the shaft, an outer circumferential groove sealingly engaging the periphery of the central opening and an outer peripheral flap valve portion covering the peripheral openings within the pressure chamber to act as a check valve for allowing air flow only from the valve chamber to the pressure chamber.