| 摘要 |
<p>The present invention relates to an overflow valve and a lower pressure 5 pump comprising the same. An overflow valve of prior art is disadvantageous in that it cannot be opened quickly and avoid fuel leakage at the same time. The overflow valve in the invention comprises: a valve body, a valve element, an elastic element comprising first and second elastic parts in series, wherein the first elastic part is received in the first cavity part with a first pre-compressed amount; a 10 partition portion arranged between the first and second elastic parts; and a blocking portion provided on an inner wall of the valve body and adapted to be abutted against by the partition portion, wherein the second elastic part is restrained in the second cavity part with a second pre-compressed amount, and the second elastic part is subjected to a pre-compressed force higher than that of the first elastic part. The technical effect of the invention lies in that the overflow valve can be opened quickly when the fuel pressure reaches a predetermined value while avoiding the fuel leakage.</p> |
