The check valves shall be of thermoplastic construction with stainless steel hinge pins, cam arm, and cam bearing.
The check valves shall be of thermoplastic construction with stainless steel hinge pins, cam arm, and cam bearing.
止回阀应该是热塑塑料结构，配置不锈钢铰链销、凸轮臂和凸轮轴承。