| 摘要 |
A metering valve is provided that is installed in the outlet passage of a master cylinder. The outlet passage has a smaller diameter inlet chamber and a larger diameter outlet chamber with a shoulder therebetween. Valve means located in the outlet passage include a first valve member normally urged into engagement with the shoulder and a second valve member is normally urged away from the first valve member to permit fluid communication through the passage. When the pressure in the passage reaches a first predetermined level, the second valve member is driven into sealing engagement with the first valve member to prevent fluid communication through the passage. The first valve member is driven away from the shoulder to resume fluid communication through the passage when the pressure in the inlet chamber reaches a second predetermined level higher than said first predetermined level.
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