| 摘要 |
PROBLEM TO BE SOLVED: To avoid generation of malfunction due to pollution of an auxiliary air control valve through blow-back gas. SOLUTION: A cylindrical valve seat 36 of a solenoid type assistant air control valve is arranged on a downstream side of a discharge port opened to a valve seat 25 of an air regulator. Discharge ports 36a are opened to both ends of the valve seat 36 in a flowing direction of auxiliary air of the valve seat 36. Air taken in from an upstream side of the air regulator is discharged from the discharge ports 36a. The auxiliary air discharged from the discharge ports of the air regulator flows around the valve seat 36 on which the discharge ports 36a are formed. Flow of the auxiliary air suppresses blow-back gas from reaching the discharge ports 36a. |
