室内 - 图1
Indoors - Figure 1

　　了解当地安装规程的有关要求。在安装装置之前应该彻底冲洗并清除管道内的外在杂质。应该如图所示安装过滤器，使其位于防回流阀前面，防止阀瓣出现不必要的污染。在管道上安装阀门，使其阀体上的箭头指向流体流向。
　　Check local codes for installation requirements. Pipe lines should be thoroughly flushed to remove foreign material before installing the unit. A strainer should be installed as shown, ahead of backflow preventer to prevent disc from unnecessary fouling. Install valve in the line with arrow on valve body pointing in the direction of flow.
　　对于室内安装，重要的是要使阀门易于接近进行检测和维修。不要安装在隐蔽位置。
　　For indoor installations, it is important that the valve be easily accessible to facilitate testing and servicing. Do not install in a concealed location.
　　警告：如果防回流阀应用在只在紧急状况下启用，而平时很少用的水管上，如消防喷淋管道等，则不要安装过滤器。重要的是系列719要定期对其是否符合当地有关规定进行检测，根据系统状况决定检测次数，但至少每年一次以上。定期检查、检测和清洗能够确保使用寿命最长，产品性能正常。
　　CAUTION: Do not install with strainer when backflow preventer is used on seldom-used water lines which are called upon during emergencies, such as fire sprinkler lines, etc. It is important that Series 719 be tested periodically in compliance with local codes, but at least once a year or more often depending upon system conditions. Regular inspection, testing and cleaning assures maximum life and proper product function.
　　注意：消防系统安装
　　美国国家防火协会（NFPA）指导原则要求对于“主管道”阀门如关闭阀或回流总成要进行流量检测。必须由有资格认证的回流总成检测员进行这项检测。在检测期间，进行流量检测的阀内件必须关闭。检测完成后，阀内件必须恢复到全开位置。
　　NOTE: Fire Protection System Installations
　　The National Fire Protection Agency (NFPA) Guidelines require a confirming flow test to be conducted whenever a "main line" valve such as the shut-off valves or a backflow assembly have been operated. Certified testers of backflow assemblies must conduct this test. The trim valves of the confirming flow test must be closed during the test. When the test is completed the trim valves must be returned to a fully open position.

室外 - 图2
Outside - Figure 2

仪表盒安装
Meter Box Installation

并联 - 图3
Parallel - Figure 3

　　在符合有关规定的地方，美国瓦茨建议常规设计美国瓦茨PVS系列水供应阀门站，这种总成由两个以上的719系列阀门通过管道并联而成，用于更大的供应主管道。这种安装类型用于要求为设施保持水流供应的地方。典型应用包括医院，多家庭住宅，购物广场和其他类似应用场合。
　　Where approved by code, Watts recommends a custom engineered Watts PVS Series water supply valve station consisting of two or more 719 Series valves piped in parallel to serve a larger supply main. This type of installation is employed whenever it is required to maintain water flow to a facility. Typical applications include hospitals, multi-family dwellings, malls and other similar applications.
　　正确设计的美国瓦茨PVS阀门站提供重复的流路，能够连续提供适量的水，能够在不中断水供应的情况下对某个阀门进行检测和维修，使用寿命更长。
　　A properly designed Watts PVS valve station provides redundant flow paths, a continuous supply of adequate water, testing and servicing of an individual valve without supply interruption, and long service life.
　　如果可能的话，通径，数量和并联结构阀门安装应该完全符合工程师的判断和一颁布的美国瓦茨调节阀最优方法。要了解美国瓦茨最优方法指南，请致电美国瓦茨1-800-617-3274。
　　The size, quantities and design of parallel valve installations should be exactly in accordance with the engineer's judgment and the published Best Practice Guide of Watts Regulator wherever possible. For a copy of the Watts Best Practice Guide, call Watts Regulator at 1-800-617-3274.

图1
Figure 1

719QT-S垂直流向朝上或垂直流向朝下安装
（图示为流向朝上）
719QT-S Vertical flow-up or vertical flow-down installation
(flow-up shown)

图2
Figure 2

玻璃纤维WattsBox
现在可提供WattsBox绝缘隔热保护柜
需要更多的资料，请参阅ES-WB或ES-WB-T.
Fiberglass WattsBox
Now Available, WattsBox Insulated Enclosures.
For more information, send for ES-WB or ES-WB-T.

图3
Figure 3

719QT-S