| 摘要 |
A lip seal is placed between a housing and a valve shaft and adjacent to a bearing of the shaft. A deposit-guard plug is placed between the housing and the shaft and adjacent to the lip seal. A first end of the lip seal is placed adjacent to a first end of the bearing. A first end of the plug is placed adjacent to a second end and a lip portion of the lip seal. A second end of the plug is placed to face a passage. A first distance from the first end of the bearing to the leading end of the lip portion of the lip seal and a second distance from the second end of the plug to the leading end of the lip portion of the lip seal are set to be longer than a maximum stroke of the shaft in stroke movement.
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