根据流向不同，平衡阀芯所受的压力可以是阀前压力，也可以是阀后压力。
According to flow in a different, balanced spool valve the pressure can be pre-pressure, can also be a back pressure valve.
只有准确地搞好钻前压力预测，搞好油气地质研究，才能确保钻井的安全。
Only through accurate pre-drilling pressure prediction and carefully geologic study, the drilling safety can be assured.
文章分析了孔板的开孔率对管路最大流量、孔板前压力、孔板后压力和孔板前后压差等的影响。
The paper analyzed the influence of the orifice ratio on maximum discharge, the inlet pressure, outlet pressure, differential pressure, ect.
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