Vacuum breakers fail supposing that leaks permit air to enter the interrupting chamber.
假如空气通过裂痕进入灭弧室，真空断路器就失灵。
The TK-DL can test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies.
TK - DL可以检测压力真空断路阀，减压防回流阀或双止回阀总成。
Series 8 is a line of unique vacuum breakers specially made to permit the attachment of portable hoses to hose thread faucets.
系列8是一种独特的真空断路阀，专用于使移动式软管连接到软管螺纹上。
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