valven.瓣膜;真空管;阀门;电子管
valve rocker arm shaft support气门摇臂轴支架
valve clearance identification气阀间隙识别
Valve Terms and Piping Symbols阀门术语和管道符号
valve control type accumulator阀控蓄电池
valve short circuit protection阀短路保护
valve rocker arm shaft bracket阀摇臂轴托架
valve-acturated pulse column阀动脉冲柱
valveless dispensing apparatus无阀剂量装置