Four required per backflow preventer.
每个防回流阀需要四个。
The dual check backflow preventer shall meet ASSE 1024.
这种双止回防回流阀应该满足美国卫生工程师协会1024标准。
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。
For use with backflow preventer test cocks to protect from damage.
用于防回流阀测试旋塞，防止受到破坏。
The backflow preventer must be installed upstream of the regulator.
防倒流装置必须安装在调节阀得上游位置。
Installing a backflow preventer in a pit or vault is not recommended.
不建议在坑内或拱顶内安装防回流阀。
Slowly open upstream shutoff and allow the backflow preventer to fill slowly.
慢慢开启上游关闭阀，让防回流阀慢慢注水。
Note Local codes typically require the use of a backflow preventer in the system.
注当地规程一般都要求在系统上使用防倒流装置。
Contact the factory for specific approvals on the reduced pressure backflow preventer.
如果需要特殊的减压防回流阀的认证，请与工厂联系。
The enclosure and the backflow preventer shall be covered by a single warranty policy.
这种外壳和防回流阀应该应用相同得质量保证政策。
Backflow preventer manufactured from 298 Series stainless steel for corrosion resistance.
防回流阀采用耐腐蚀得300系列不锈钢制造。
Backflow preventer manufactured from 300 Series stainless steel for corrosion resistance.
防回流阀采用耐腐蚀的300系列不锈钢制造。
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。
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