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- Four required per backflow preventer. 每个防回流阀需要四个。
- 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。
- 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。
- The relief valve may be serviced while on or off the backflow preventer valve. 可以在防回流阀上维修安全阀,或将其从防回流阀拆卸下来维修。
- 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。
- Winterization of backflow preventers. 防回流阀的过冬处理。
- 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。
- The user installs a dual check backflow preventer at the water meter as prescribed by the supplier of safe drinking water. 用户要由安全饮用水供应商在水表处安装法定的双止回防回流阀。
- In-line flow restrictor protects the meter measuring element and the backflow preventer components from damage due to excessive flow. 管内流量限制器保护仪表测量元件和防回流阀部件不会因为过大的流量而受到损坏。
- 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。
- REDUCED PRESSURE ZONE BACKFLOW PREVENTER For High Hazard Cross-connections and continuous pressure application. 减压区防回流阀用于高危险交叉连接和持续压力应用场合。
- DUAL CHECK VALVE BACKFLOW PREVENTER For low hazard cross-connections. Continuous pressure applications. 双止回防回流阀用于低危险交叉连接。持续压力应用场合。
- A strainer should be installed as shown, ahead of the backflow preventer to prevent discs from unnecessary fouling. 应该如图所示安装一个过滤器,安装位置位于防回流阀之前,以防止不必要的污染。
- 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。
- Backflow preventer body and adapters are of 316 stainless steel construction and all rubber components comply with FDA food additive regulations. 防回流阀阀体和适配器是316不锈钢结构,所有橡胶部件符合美国食品及药物管理局(FDA)食品添加剂规定。
- Check the state and local codes to ensure that the backflow preventer is installed in compliance, such as the proper height above the ground. 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。