GEM D serial are intelligent efficiency circulation pumps. Equipped with permanent magnet motor and intelligent pressure control system.It adopts canned structure. The motor stator is completely canned, the rotating part is are immersed in the conveying liquid,the liquid plays the role of cooling the motor and lubricating the bearings. The product has the characteristics, such as no leakage, super quiet, energy saving , high efficient, frequency controlled, easily operated,etc.