注：关闭阀：如果有必要重新拆卸和重新装配关闭阀，则配置测试旋塞的关闭阀应该安装在防回流阀的进口侧。
　　Note: Shutoff Valves: When shutoff valves are removed and reassembly is necessary, the shutoff valve with the test cock is to be mounted on the inlet side of the backflow preventer.

1. 009应该总是安装在便于检测和维修的能够接近的位置(参阅上一页)。查阅所在的州和当地有关的规定，确保所安装的防回流阀符合有关要求，如地面以上正确的高度。
   The 009 should always be installed in an accessible location to facilitate testing and servicing (See page 2). Check the state and local codes to ensure that the backflow preventer is installed in compliance, such as the proper height above the ground.
2. 我们建议在009系列总成的前面安装一个过滤器，以保护内部部件不会受到不必要的污染。
   警告：如果防回流阀用在只有在危急时候，如消防喷淋管道等很少使用的水管上，则不要安装过滤器。
   启动：下游关闭阀应该处于关闭状态。慢慢打开上游，并灌注阀门。当阀门注满时，慢慢开启下游关闭阀，灌注水供应系统。这样做是必要的，能够避免水锤或冲击现象所造成的损坏。
   We recommend a strainer be installed ahead of 009 series assemblies to protect the internal components from unnecessary fouling.
   Caution: Do not install with strainer when backflow preventer is used on seldom-used water lines which are called upon only during emergencies, such as fire sprinkler lines.
   Start Up: The downstream shutoff should be closed. Open upstream slowly and fill valve. When valve is filled, open the downstream shutoff slowly and fill the water supply system. This is necessary to avoid water hammer or shock damage.
3. 应该按照有关规定的要求对安全阀排泄的水进行引导。连接安全阀的排泄管绝对不应该固定插入到排泄地漏、下水道或污水坑里。排泄口应该离地面大约304毫米的地方，或通过气隙(或称气隙)及管道引导到地漏处。
   注：安全阀排泄能力
   安装一个配置终端在地漏上方的排泄管气隙，用于处理通过安全阀的正常排放或有害排放。但是，地漏口径大小应该能够防止由于突发故障所导致的水破坏。请参阅图1，了解安全阀的最大排放流量、通径和主要地漏的性能。
   注： 不要减少气隙接出的排泄管口径。所接管道应该是与气隙口径完全相同。
   Water discharge from the relief valve should be vented in accordance with code requirements. The relief valve should never be solidly piped into a drainage ditch, sewer or sump. The discharge should be terminated approximately 12" above the ground or through an air gap piped to a floor drain.
   NOTE: Relief Valve Discharge Rates
   The installation of an air gap with the drain line terminating above a floor drain will handle any normal discharge or nuisance spitting through the relief valve. However, floor drain size may need to be designed to prevent water damage caused by a catastrophic failure condition. Please refer to Figure No. 1 for maximum relief valve discharge rates, size and capacity of typical floor drains.
   NOTE: Do not reduce the size of the drain line from the air gap fitting. Pipe full line size.
4. 初始安装后，为了消除污垢和管道内的混合物，有时需要进行管道冲刷。如果冲刷不适当，可能造成安全阀开启产生排放。如果排放物不清洁，则拆卸第一止回阀进行彻底的清洗。
   注：在闭端应用环境，如锅炉给水管道或冷却塔补水管道，由于在静态或无流动期间，供应压力有所波动，因此安全阀可能发生周期性排放。为了避免这类排放，要在防回流阀总成前安装一个弹簧负载橡胶阀座止回阀来"锁定"下游压力。
   After initial installation, a discharge from the relief valve opening may occur due to inadequate initial flushing of pipe lines to eliminate dirt and pipe compounds. If flushing will not clear, remove the first check valve and clean thoroughly.
   NOTE: Periodic relief valve discharge may occur on dead end service applications, such as boiler feed lines or cooling tower makeup lines due to fluctuating supply pressure during a static or no flow condition. To avoid this discharge, install a spring-loaded rubber seated check valve ahead of the backflow assembly to "lock-in" the downstream pressure.
5. 除非完全必要，且符合当地有关规定的要求，否则绝对不要在坑内更换防回流阀。如果要在坑内更换，则应该采取措施保证排放总是在地面上。或者，对于坑内排放，确保在安全阀下方配置适当的气隙。
   Backflow preventers should never be placed in pits unless absolutely necessary and then only when and as approved by local codes. In such cases, provision should be made to always vent above flood level or for a pit drain to ensure an adequate air gap below the relief port.
6. 重要的是系列009防回流阀应该定期检查安全阀排放出的任何排放物。根据排放物状况能够明确确定是否应该对止回阀进行清洗或维修。此外，应该按照当地有关规定对装置的运行状况定期进行检测，根据具体情况至少一年一次以上。
   在无流体流动期间，安全阀在下列条件下将会排放，(1) 第一止回阀被污染，或(2) 由于上游压力波动导致装置的进口压力明显下降，影响到进口压力和减压区之间的所需的工作压差。此外，在紧急回流或产生水锤现象时，则当第二止回阀被污染，将可能发生这类安全阀喷溅或排放。如果需要了解故障检修指南，请参阅S-TSG.
   注：在检测安装在消防系统上的总成时，有必要进行特别的安排。
   消防系统安装：美国国家消防局(NFPA)指导原则要求当"主管道"阀门如关闭阀或防回流阀总成已经运行时，要进行流量检测。这类检测必须由有资格证书的检测人员进行。
   It is important that Series 009 backflow preventers be inspected periodically for any discharge from the relief valve which will provide a visual indication of need for cleaning or repair of check valves. Also testing for proper operation of the device should be made periodically in compliance with local codes, but at least once a year or more often, depending upon system conditions.
   Relief vent will discharge water when, during no-flow periods, (1) the first check valve is fouled or (2) the inlet pressure to the device drops sufficiently due to upstream pressure fluctuations to affect the required operating differential between the inlet pressure and reduced pressure zone. Other wise, such relief (spitting) can occur when the second check is fouled during emergency backflow or resulting from a water hammer condition. For troubleshooting guide send for S-TSG.
   NOTE: Special considerations are necessary when testing assemblies installed on Fire Prevention Systems.
   Fire Protection System Installations: The National Fire protection Agency (NFPA) Guidelines require a confirming flow test be conducted whenever a "main line" valve such as the shutoff valves or a backflow assembly have been operated. Certified testers of backflow assemblies must conduct this confirming test.

图1
Figure 1

安全阀排放流量
DN15 - DN25, 009
Relief Valve Discharge Rates
¹/₂" – 1" 009

区域压力 psi
Zone Pressure psi

DN32 - DN80, 009
1¹/₄" – 3" 009

区域压力 psi
Zone Pressure psi