为提高现有双级注水泥器打开和关闭的成功率，研制了DSG—A型系列双级注水泥器。
To raise the success rate of opening and closing the two-stage cementing tool, Model dsg-a cementing tool is developed.
介绍了SJG-A型双级注水泥器的结构特点、使用要求及现场应用情况。
The paper gives an introduction to the structure , operating requirements and applications in olifields of Type SJG A double stage cementing implement.
型滚筒熨平机为双级熨压．其压力可由的液压系统控制，可实现连续调整。
Two pressure rollers are adopted and the ironing pressure which is controlled by hydraulic system can be adjusted freely.
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