●　反向环流型（HQ）

●　Reverse Circulation Type(HQ Type)

用于饱和蒸汽压特性曲线陡峭的液体。该类液体在冷却电机后如果再返回到叶轮进口部位非常容易汽化。HQ型的反向环流通过电机后，从尾部回到进口罐气化区域。反向环流管内设置调节阀等方式进行节流，保持电机内液体所需要的压力，同时具有排空管线作用。

Designed for fluids with steep vapor pressure curves which would tend to vapourize if returned to impeller eye after absorbing motor to the vapor zone of the suction vessel.The return line can be adjusted by the throttled valve and the motor chamber pressure highter than the vapour pressure,meanwhile,the line could drain remainder liquid in the reverse line.