There are some methods of proportional valve test, which need many elaborate test instruments.
目前比例阀测试的办法比较多，所需的测试仪器繁多复杂。
2
By adopting ATEQ F520 instruments and electronic governing valve the engine cylinder cc sealing detection.
通过采用ATEQ F520仪器及电子调压阀对发动机缸体缸盖进行密封性检测；
3
Through fuel pumps, plus a throttle valve of statistical instruments, minus contained, thus allowing detection instruments in different load performance parameters.