The pump having the Angle adjustable vane is called the variable pitch vane type, and having the non-adjustable vane is called the fixed vane type.

循环水泵可分为拥有叶片角度调节装置的可调叶片式，和叶片不可调节的固定叶片式。

youdao

The pump having the Angle adjustable vane is called the variable pitch vane type, and having the non-adjustable vane is called the fixed vane type.

循环水泵可分为拥有叶片角度调节装置的可调叶片式，和叶片不可调节的固定叶片式。

youdao