| 摘要 |
The pressure control valve is structured such that a first port is formed on one side of a casing, a second port is formed on the other side, and, in the casing, there are disposed not only a positive pressure valve which, when the pressure on the first port side becomes high, can be moved to the second port side to thereby communicate with the second port side, but also a negative pressure valve which, when the pressure on the first port side becomes low, can be moved to the first port side to thereby communicate with the second port side. In the pressure control valve, there is provided flow passage expanding means which, which the positive pressure valve has moved to the second port side beyond a given distance, allows the first port side to communicate with the second port side. Further, the evaporation fuel discharge control device comprises first communicating means which allows the upstream side of a switch valve to communicate with an pressure introduction passage when the pressure on the upstream side of the switch valve is higher by a given value or more than the pressure on the pressure introduction passage side, and second communicating means which allows the upstream side of the switch valve to communicate with the pressure introduction passage when the pressure on the pressure introduction passage side is higher by a given value or more than the pressure on the upstream side of the switch valve.
|
