This timing is affected by the relationship among poppet weight, spring rate, poppet travel distance, plungerspeed, and plunger diameter.
定时受提升阀重量，弹簧振频，提升阀阀程，活塞速度以及活塞直径的影响。
2
The calculations for the stroke, speed and acceleration of the plunger are summarized, providing a basis for selecting the structure and working parameters of the pump.
还综述了柱塞冲程、速度和加速度的计算，为特种抽油泵结构和工作参数的正确选择提供了依据。
3
The dart is the only moving plunger part and is capable of withstanding high impacts from high speed wells.