| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a negative pressure booster capable of returning a vacuum valve seat member and a valve body to a usual position without rotating the vacuum valve seat member in a circumferential direction relative to the valve body. <P>SOLUTION: In the negative pressure booster, a whirl-stop part is provided on the valve seat member and the valve body, and the valve seat member is not rotated relative to the valve body. <P>COPYRIGHT: (C)2008,JPO&INPIT |
