Modular check construction featuring nonreversible checks with captured springs for simplified servicing.

模块化止回结构特点在于不可逆止回，配置简化维修的复位弹簧。

A strainer is recommended to be installed ahead of the backflow preventer to prevent the fouling of the check assembly and resulting spillage from the valve during repressurization.

建议在防回流前安装一个过滤器，防止由于止回总成受到污染而导致这种门在再增压期间产生泄漏或溢出。