| 摘要 |
<p>PURPOSE:To improve assembly workability and airtightness in a bidirectional valve and a fuel cut off device built in with this bidirectional valve. CONSTITUTION:In a fuel cut off device 10, a partitioning wall plate 28 is ultrasonic welded to a fixing stepped part 15 of a case main unit 12, to form an air-tight bidirectional valve chamber 24 of this partitioning wall plate 28 and the case main unit 12, and a bidirectional valve 20, comprising positive/negative pressure valve mechanisms 30, 50, is stored inside of this bidirectional valve chamber. A negative pressure valve body 52 of the positive pressure valve mechanism 30 and a negative pressure use spring 53 are integrally formed with a positive pressure valve body 34 of the positive pressure valve mechanism 30, and this positive pressure valve body 34 is integrally formed with the partitioning wall plate 28 through engagement of an engaging annular body 63 of a valve receiver 32 with an engaging circular arc piece 62 of the partitioning wall plate 28, to form these members into subassembly. In this way, when this subassembly object is built in the case main unit 12 from one way through a lower end opening 17 of the case main unit 12, storing the bidirectional valve 20 is completed.</p> |
