oil return check valve 回油止回阀

oil return regulating valve 回油调节阀

vent valve return oil 通风阀回油

relief valve return oil line 安全阀回油管线

diverter valve oil return line 分流器阀回油管路

oil l return valve 回油阀

automatic oil-return float valve 自动回油浮子阀

return oil check valve 回油单向阀

oil l return check valve 回油止回阀