bailer, valve drill bit (valve auger)
阀门促动器
valve actuator【机】
暂无补充释义。
valve actuator【机】
暂无补充释义。
bailer, valve drill bit (valve auger)
by-pass check valve (free-wheeled check valve)
semilunar valve
mitral valve-semilunar valve
AC solenoid for valve
solenoid directional valve
dual ball check valve
AC magnetic blowout valve type arrester【电】