动臂油缸安装的单向阀
boom cylinder mounted check valve
压力控制顺序阀单向阀
priority valve check valve
转向控制阀单向阀
steering control valve check valve
定期隔离阀渗漏试验
periodic isolationvalve leak test
浅议变压器的渗漏
A Brief Discussion on Transformer Leakage
渗漏的制动器冷却油
leaking brake cooling oil