简要介绍了国外最新应用的清蜡、防蜡方法，诸如油井油管注入阀清蜡、负压冲击清蜡、井下就地产热清蜡、油井直接电加热清蜡和使杆管表面亲水防蜡等。
The latest technologies in paraffin removal and control in foreign countries are briefly introduced, such as paraffin removal by oil well tubing fillup valve, negative pres…
巴扎尔吉特当初设计了一个安全阀，当管网中的污水太多时，不经处理的污水便直接注入泰晤士河。
Bazalgette's design included a safety valve: when too much waste enters the system, raw sewage runs into the River Thames.
设计的切换阀可使试样及空气定量注入，并能准确间隔试样带。
A new valve is designed to inject the sample and the bubbles into the carrier stream quantitatively.
配注器装有孔口阀和单向阀系统，使泵入的流体沿环空向下或沿注入管线向下进入生产导管。
The injection mandrel is equipped with a port - and check-valve system to direct fluid pumped down the annulus or injection line into the production conduit.
稍微开启关闭阀1号，将水注入管子直到顶部为止，然后关闭1号关闭阀。
Slightly open shutoff valve No. 1 and allow water to fill the tube to the top then close No. 1 shutoff.
通过由电磁阀组成的控制单元，控制注入步进缸的流量，使缸外套作步进运动，拖动中子吸收元件；
The outer tube of the cylinder will be moving step by step by controlling flow, driving the neutron absorber and controlling nuclear reaction.
外部冲程控针孔阀分配非常精细的沉积物，外部冲程控制调节注入尺寸。
Needle Valves dispense very precise deposits. An external stroke control adjustment to fine-tune shot sizes.
外部冲程控针孔阀分配非常精细的沉积物，外部冲程控制调节注入尺寸。
Needle Valves dispense very precise deposits. An external stroke control adjustment to fine-tune shot sizes.
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