Reciprocating Positive Displacement pumps may use plungers with static seals pistons with dynamic seals or liquid diaphragms to achieve their pumping action.
往复式正排量泵可能使用带有固定密封的活塞；带有动密封的活塞；或隔膜来运行水泵。
Using magnetic fluid dynamics and thermodynamics theory, a study on the results of axial bearing pressure ability of rotation axis magnetic fluid static seals was introduced.
介绍了利用磁流体动力学、热力学理论，研究旋转轴磁流体静密封轴向承压能力的结果。
There are two types of seals. Static seal and dynamic seal.
密封垫的种类有两种。静密封和动密封。
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