Type IS, IY pumps are designed at full back pull out, the pump casing and pump cover is separate from impeller back face, pump casing and pump cover are combined a working house;

• IS、IY型泵的结构采取后开门的结构形式，即泵体与泵盖的分界在叶轮的背面，泵体和泵盖构成泵的工作室；