总是成双成对 run in couples ; hunt in couples ; go in couples
双管关井总成 double shut-in assembly
双轴承总成 double bearing assembly
双支承梁总成 double bolster assembly
双软管总成 two hose assembly
双泵盖总成 double-pump head assembly
双桥总成 Zweiachsaggregat
双车桥总成 double axle assembly
双泵筒总成 double-pump barrel assembly
双泵驱动总成 double-pump drive assembly
系列719双止回阀总成应该安装在每个标注的位置上。
Series 719 Double Check Valve Assembly shall be installed at each noted location.
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。
The TK-DL can test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies.
适用于检测压力真空断路阀，减压防回流阀或双止回阀总成，不再需要压力表和压差表。
Designed to test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies, allowing you to eliminate both pressure and differential test gauges.
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