The particle valve model, obstacle cell valve model as well as the body fitted valve model representing the valvemotion were established.
建立了反映气门运动的粒子阻滞模型、障碍物单元模型以及贴体气门模型，并提出计算粒子阻滞的修正公式。
2
The simulation program for the valvemotion was developed, and simulation tests were carried out on the valves of both Model F800 and Madel 3nb-1300 drill pumps.
Valvemotion is analyzed with different refrigerants in the compressor. It is discovered that density of refrigerant have great influence on the movement of valve.