| 摘要 |
A vacuum booster has a housing the interior of which is divided into a vacuum chamber and a pressure chamber, a plunger connected to an input rod and fitted slidably in a cylinder portion of a valve body, and valve seats defined respectively on adjacent ends of the plunger and the cylinder portion to cooperate with a seating surface of a valve member for controlling respectively the communication between the pressure chamber and the atmosphere and between the two chambers. A surface portion of the seating surface of the valve member with which at least one of the valve seats engages is a curved rotational surface.
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