Advantages: low cost Ischaemum valve, such as the use of suitable materials useful life of rubber over the metal non-return valve, easy installation, flexible installation, can be repaired.

• 优点：鸭嘴阀成本低，如采用合适橡胶原料使用寿命超过金属止回阀，安装方便，安装方式灵活多样，可修补。