Media type check valve for preventing backflow.
止回阀类用于阻止介质倒流。
A check valve may be required ahead of the backflow preventer.
此时在防回流阀前面可能需要安装一个止回阀。
Since then we installed a backflow valve so it was less this time.
自从那时起, 我们安装了一个逆流阀, 所以这次少了很多。
The system should be flushed before the backflow valve is installed.
在安装回流阀之前系统应该进行冲刷。
NOTE DO NOT USE A PIPE WRENCH TO REMOVE THE RELIEF VALVE ASSEMBLY FROM THE BACKFLOW PREVENTER.
注意不要使用管钳从防回流阀上拆卸安全阀总成。
The shutoff valve with the test cock is to be mounted on the inlet side of the backflow preventer.
带测试旋塞的关闭阀应该安装在防回流阀的进口侧。
Closing of the valve during ventricular contraction prevents the backflow of blood into the atrium.
截止阀在心室收缩, 防止血液回流到心房。
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