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容积式泵是依靠工作元件在泵缸内作往复或回转运动，使工作容积交替地增大和缩小，以实现液体的吸入和排出。工作元件作往复运动的容积式泵称为往复泵，作回转运动的称为回转泵。
Volume type pump is to rely on the working element in the pump cylinder for reciprocating or rotary motion, so that the working volume of the alternating increase and reduce, to achieve the liquid suction and discharge. The working element for reciprocating movement of the volume type pump, called a reciprocating pump, as a rotary movement of the rotary pump.
前者的吸入和排出过程在同一泵缸内交替进行，并由吸入阀和排出阀加以控制；后者则是通过齿轮、螺杆、叶形转子或滑片等工作元件的旋转作用，迫使液体从吸入侧转移到排出侧。
The ber inhalation and discharge process in the same pump cylinder alternaby to, and controlled by the suction valve and discharge valve; the latter is through the rotation of the gear, screw, lobed rotor or slip sheet work element, forcing the liquid from the suction side to the discharge side.
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