double check valve arrangement  二级单向阀布置

double cylinder lock valve  双缸锁定阀

double double iron  八叠板

double stack two-valve double outlet hydrant  双立管双阀双出口型消火栓

Double Valve  双楔割眼式; 双楔抽心孔式; 双阀

Double valve feedback compensation control  双阀反馈补偿控制

double valve group  双阀组

Double valve replacement  双瓣置换术; 瓣膜置换

double valve shoe  双阀管鞋

double valve spring  双气门弹簧

Double-Lock  双重锁上

Double-Valve Filter  双阀滤池

air lock valve  气锁安全阀; 空气闭锁阀

attachment tilt cylinder lock valve  附属装置升降倾倒用油缸锁定阀

boom lock valve  动臂止动阀

boom raise cylinder lock valve  动臂提升缸止动阀

cylinder lock valve  油缸锁阀

cylinder lock valve assembly  油缸锁阀总成

defective tilt lock valve  损坏的转角锁定阀