通径：DN20 - DN50
Sizes: ³/₄" - 2" (20 - 50mm)

　　系列188A用于防止污染水反虹吸进入饮用水供应中。其特点包括轻型耐用的“阀瓣浮子”，适用温度高达82^oC，可关闭大气排气口，防止所有流量的泄漏或溢出。如果下游需要，排气口阀瓣总成升起，密封住大气排气口，让水流动。供应压力的减少，或负压力的产生使得排气阀瓣总成下降，开启大气排气口，关闭阀门供水端口。建议用在低流量装置，如使用少量水的实验室设备上。包括一个耐用的硅酮阀瓣，这种阀瓣能够承受高温和水锤冲击，确保以最轻的阀座接触实现很好的密封性。
　　Series 188A is designed to prevent the backsiphonage of contaminated water into the potable water supply. Features a lightweight, durable "disc float" suitable for temperatures up to 180^oF (82^oC) which closes the atmospheric vent to prevent spilling under all rates of flow. Upon downstream demand, the vent disc assembly rises, sealing the atmospheric vent, allowing water to flow. A loss of supply pressure or the creation of a negative supply pressure causes the vent disc assembly to drop, opening the atmospheric vent and closing the supply side of the valve. Recommended for low flow installations such as laboratory equipment which use small amounts of water. Contains a durable silicone disc which has high heat and water hammer shock resistance and ensures tight seating with the lightest of seating contacts.

规格说明
Specifications

　　用于反虹吸真空断路阀
　　在计划防止污染水反虹吸现象的地方，应该安装一个反虹吸真空断路阀。这种装置不是用在连续压力环境中，也不是用在可能产生反压环境中。这种装置应该满足美国卫生工程师协会（A.S.S.E.）标准1001，美国国家标准化组织（ANSI）标准A112.1.1和加拿大标准协会（C.S.A.）标准B64的要求。美国瓦茨调节阀公司系列188A。
　　For Anti-Siphon Vacuum Breakers
　　An anti-siphon vacuum breaker shall be installed where indicated on the plans to prevent the backsiphonage of contaminated water. This device is not to be used under continuous pressure or where there is a possibility that a backpressure condition may develop. The device shall meet the requirements of A.S.S.E. Standard 1001, ANSI A112.1.1 and C.S.A. B64. Watts Regulator Company Series 188A.

材料
Materials

188A

认证
Approvals

1001	B64.1.1

压力 - 温度
Pressure – Temperature

　　最大温度：82^oC
　　最大工作压力：125psi (8.6 bar)
　　Maximum Temperature: 180^oF (82^oC)
　　Maximum Working Pressure: 125psi (8.6 bar)