系列7和7C
双止回防回流阀
适用于在线连续压力应用
通径：DN10
SERIES 7/7C
Dual Check Backflow Preventer For
In-Line Continuous Pressure Applications
Sizes: ³/₈" (10mm)

说明
DESCRIPTION

　　双止回系列7C特别适用于在线连续压力应用，如冲刷洗涤盆或其他有软管类的装置连接到室内水供应系统中的应用，这些装置可能浸没在非饮用水中。
　　The Dual Check Series 7C is ideally suited for in-line continuous pressure applications such as wash-down sinks or other applications in which a hose-type device, connected to the domestic water supply, can be submerged in a non-potable liquid.

标准
STANDARDS

　　7C是通过美国国家标准化组织(ANSI)和美国卫生工程师协会(ASSE)标准1024的检测和认证，满足“双止回防回流阀”标准的要求。获得加拿大工业标准协会(CSA)标准号B64.6认证。
　　重要：咨询有关主管部门，了解当地有关安装的要求。
　　7C is tested and certified to meet ANSI/ASSE Standard 1024 for "Dual Check Valve Type Backflow Preventers." CSA Certified to Standard No. B64.6.
　　Important: Inquire with governing authorities for local installation requirements.

规格说明
SPECIFICATIONS

　　这种双止回防回流阀应该安装在每个冲刷洗涤盆软管装置处或参照交叉连接，以防止非饮用水回流到室内饮用水系统中。这些装置应该是镀铬黄铜，由两个独立的作用止回阀构成，内部负载施加在正常的关闭位置，设计和结构适用于在间歇和连续压力环境中运作。这种防回流阀应该是美国瓦茨调节阀公司的DN10系列7C。（请选择最适合用户应用环境的型号。）
　　A dual check backflow preventer shall be installed at each wash sink hose unit or at referenced cross-connections to prevent the reverse flow of non-potable water into the potable domestic water system. These devices shall be chrome-plated brass consisting of two independently acting check valves, internally force-loaded to a normally closed position and designed and constructed to operate under intermittent or continuous pressure conditions.The backflow preventer shall be Watts Regulator Company's ³/₈" (10mm) Series 7C. (Please select the model best suited to your application.)

可提供的产品
PRODUCT AVAILABILITIES

　　系列7C：可提供的连接 - 类型，可提供的订购编号、通径。
　　Series 7C: Inlet Connections – Types available, ordering code, sizes available.

• 7 - 黄铜
  7 – Brass
• 7C - 黄铜，带镀铬镍表面
  7C – Brass with chrome nickel plate finish
• H7和H7C - 配置黄铜或镀铬镍内的软管连接
  H7/H7C – With hose connection in brass or chrome nickel plate

材料
MATERIALS

　　标准配置为机加工黄铜结构，镀铬镍阀体，乙丙橡胶止回阀瓣总成和丁钠橡胶密封，不锈钢弹簧和压力板。
　　Machined brass construction, chrome nickel plated body, EPR rubber check disc assemblies and Buna 'N' seals, stainless steel springs and pressure plates are standard.

压力 / 温度
PRESSURE / TEMPERATURE

　　最大压力：150 psi (10 bars).
　　最小压力：10 psi (69 kPa).
　　工作温度：0.6^oC至60^oC持续温度；间歇温度可达82.2^oC
　　最大建议流量：15加仑/分钟 （57公升/分钟）
　　Maximum pressure: 150 psi (10 bars).
　　Minimum pressure: 10 psi (69 kPa).
　　Working temperature: 33^oF to 140^oF constant; intermittent to 180^oF (0.6^oC to 60^o C sustained; intermittent to 82.2^o C).
　　Maximum recommended flow: 15gpm (57lpm)