double check valve

基本解释

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。
Pre-installation required to double-check valve, and clear the valve internal transport, storage process of the damage caused.
安装前需仔细检查阀门，并清除阀门内在运输、存放过程中造成的损害。
Double Check Valve Assembly shall be installed at referenced cross-connections to prevent the backflow of polluted water into the potable water supply.
在相关的交叉连接处应该安装一个双止回阀总成，以防止受到污染的水回流到饮用水系统中。