The double-acting variable-vane pump is a new type of variable pump.

双作用式变量叶片泵是一种新型变量泵。

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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。

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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。

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