automatic by pass valve
... automatic brake valve 自动制动阀 automatic by pass valve 自动旁通阀 automatic check valve 自动止回阀 ...
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凸轮控制自动旁通阀 cam controlled automatic by-pass valve
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SPRD旁通阀是当各种区域风门自动关闭时用在区域系统中，可以在管道系统中增加空气压力盒速度。
The SPRD is used on zone systems when the automatic closing of various zone dampers can create an excessive increase in air pressure and velocity throughout the duct system.
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