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- Winterization of backflow preventers. 防回流阀的过冬处理。
- Also, mechanical backflow preventers and air gaps can be bypassed. 此外,机械式防回流阀和气隙可以作为旁路。
- UL/FM approved backflow preventers must include UL/FM approved OSY. FM认证防回流阀必须包括UL/FM认证外阀杆轭架。
- Four required per backflow preventer. 每个防回流阀需要四个。
- Double check valve backflow preventers with a water meter and double check in by pass line. 双止回阀防回流阀配置一个水表和旁路管道上的双止回阀。
- For flange size backflow preventers installed vertically (flow down), a fabricated air gap is recommended. 对于垂直安装的法兰通径防回流阀,则建议采用预制气隙。
- When installing a drain line, use Series 909 air gaps on Model 909 backflow preventers. 在安装排泄管线时,在型号909防回流阀上采用系列909气隙。
- 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。
- For use with backflow preventers, isolation valve for gauges, isolation valves for small equipment lines. 用于防回流阀,用于仪表的隔离阀,用于小型设备管道的隔离阀。
- The following Test Procedure is one of several that is recognized throughout the United States for testing Backflow Preventers. 下列检测程序是美国检测防回流阀通用的几种检测程序中的一种。
- A strainer should be installed as shown, ahead of backflow preventers to prevent discs from unnecessary fouling. 应该如图所示在防回流阀前安装一个过滤器,防止阀瓣出现不必要的污垢。
- 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。
- 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 protection against backpressure backflow, install Watts Series 909 or Series 009 reduced pressure principle backflow preventers. 对于反压力回流保护,需要安装美国瓦茨909系列或009系列减压原理防回流阀。
- Mechanical backflow preventers have internal seals, springs, and moving parts that are subject to fouling, wear, or fatigue. 机械式防回流阀配置内部密封、弹簧和移动部件可能会被污染、磨损或疲劳。
- It is generally recommended that backflow preventers never be placed in pits unless absolutely necessary and then only when approved by local codes. 除非绝对必要并通过当地有关规定的认可,否则一般建议绝对不要在坑内更换防回流阀。
- Dual Check Series 7B Backflow Preventers feature a similar design to Series 7 (see page 2), but are constructed of machined brass rather than bronze. 双止回阀7B防回流阀是系列7的简化型(参阅第2页),但是其结构式机加工黄铜而不是青铜。
- The backflow preventer must be installed upstream of the regulator. 防倒流装置必须安装在调节阀的上游位置。
- 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(ASSE)1024标准。
- When installing a drain line on Series 909 backflow preventers that are installed horizontally, use 909 AG series air gaps. 如果在水平安装的系列909防回流阀上安装排泄管,则需采用909AG系列气隙。