Internal exhaust valve increases down stroke speed.
内部排气阀增加下冲速度。
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。
The pressure, stroke, speed, dwell time and shut height can be adjusted according to request, allowing for convenient operation;
压力、行程、速度、保压时间、闭合高度均可按需求调整，方便操作；
The pressure, stroke, speed, dwell time and shut height can be adjusted according to request, allowing for convenient operation;
压力、行程、速度、保压时间、闭合高度均可按需求调整，方便操作；
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