| 摘要 |
A check valve (7) is configured so as to be equipped with: a valve body (15) that opens/closes a flow path communicating with a purge pipe (5); a spring (17) that presses the valve body (15) in the direction for closing the flow path; and an air damper structure (13) that generates attenuation force in the opening/closing directions with respect to the valve body (15). Thus, it is possible to prevent following movement of the check valve (7) in response to pressure pulsation generated by duty driving of a purge solenoid valve (6), and it is possible to prevent unnecessary opening/closing operations of the check valve (7). Furthermore, attenuation force from the air damper structure (13) is applied to the closing force of the spring (17) when vibration occurs, so the load on the spring (17) can be reduced, and valve-opening performance of the check valve (7) at the time of a low pressure differential can be improved. |
