A reciprocatingpiston, the inhalation and from a liquid, known as a working cycle; this pump known as the single-action pump.
活塞往复一次，各吸入和排出一次液体，称为一个工作循环；这种泵称为单动泵。
2
Mud pump Classification mud sub-single-effect and two types of double acting, single acting mud pumppistonreciprocating in a cycle of action only to complete a suction drain.