译文：
混输泵在流程系统里运行后，泵进出管线之间产生一定的压差。当停泵阀门未关闭时，有可能泵发生倒转现象。由于油气混输中流体大部分是气体，流动阻力较小，流动速度快，会使泵反转超过额定转速，发生飞车现象，容易发生事故。在设计流程时，应采取相应措施，防止发生这种现象。可以在泵出口管路上安装逆止阀，防止流体反向流动，这种方法最简单实用可靠；也可选用附带制动装置的电动机。 在实际设计单螺杆泵油气混输流程时，须根据油区的具体情况，综合分析油气混输量、油气产量、油气比、采油回压、输送距离等诸多因素，多方面的调查研究，多方案的对比分析，选择合适的混输泵型，制定出合理的流程布局，才能实现油气混输安全、科学、可靠、经济的运行。 泵前确保泵的不间断供液，分离罐起到缓冲作用，分离的天然气也可用作加热炉燃料。在该混输系统中，两台泵并联，管路对称布置；进口管线的压力变送信号送至电控柜，通过变频器调节泵排量实现泵入口恒压控制；泵出口压力继电器信号送至电控柜实现超压力自动报警、自动停泵；泵出口单流阀起到防止介质倒流和混输泵反转的作用。防止单螺杆泵超压运行一般单螺杆泵输送介质的性质、状态都比较复杂，在管路里可能造成堵塞。因单螺杆泵是容积式类型的泵，当发生堵塞或人为操作失误时，会造成泵的超压，很容易损坏其零部件。为了防止泵的损坏，必须在泵的排出管到吸入管之间安装安全阀。也可在出口管线安装压力继电器，在泵超过额定压力时自动报警停泵。

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原文：
Multiphase pump in the process the system is running, pumping out of a pressure differential created between pipelines. When the stop valve when the door is not closed, it is possible pump reverse phenomenon occurred. Because the majority of oil and gas mixed transmission fluid is a gas, a smaller flow resistance, flow speed, will pump more than the rated speed reversal, occur Speed phenomenon, susceptible to accidents. In the design process should take appropriate measures to prevent the occurrence of this phenomenon. Can be installed in the pump outlet tube on the road check valve to prevent reverse flow of fluid, this approach is the most simple and practical and reliable; can also use motor with brake. In the actual design single-screw pump oil and gas mixed transportation process, it should be according to the specific circumstances of the oil zone, a comprehensive analysis of the amount of oil and gas mixed transportation, oil and gas production, gas-oil ratio, extraction back pressure, transmission distance and many other factors, many of the research, comparative analysis of multiple programs, select the appropriate multiphase pump type, worked out a reasonable process layout can be realized oil and gas mixed transportation safety, scientific, reliable, economical operation. Pump before the pump to ensure the uninterrupted supply liquid separation tank cushion, separating the natural gas is also used as furnace fuel. In the mixed transportation system, the two pumps in parallel, pipeline symmetrical arrangement; import pressure pipeline transmission signal sent to the control cabinet, through the inverter adjust pump displacement control to achieve constant pressure pump entrance; pump outlet pressure relays signals sent to the control cabinet to achieve super-pressure automatic alarm, auto-stop pump; pump outlet to play a single flow valve to prevent backflow and mixed media pump reversal effect. A single-screw pump is running to prevent overpressure in a single-screw conveying the nature of the medium, the state is more complicated, may cause blockage in the pipes inside. A result of single-screw pump is a positive displacement type pumps, the event of blockage or human operational errors, it will result in over-pressure pump, it is easy to damage the components. In order to prevent damage to the pump must pump discharge pipe into the suction pipe installed between the safety valve. Can also be installed in the export pipeline pressure relays, pressure in the pump than the rated pump shut down automatically when the alarm.