A two-stroke engine has no moving valves, and the spark plug fires each time the piston hits the top of its cycle.
二冲程发动机没有移动的阀，火花塞每次点火活塞到达循环顶端。
2
This paper develops a dynamic pressure test system for ZTY265 natural gas compressor which is a two step piston type compressor and driven by twostroke internal combustion engines.