真空泵    vacuum pump

风车式螺桨    vane propeller

轮叶泵    vane pump

[径向]变距螺桨    variable pitch propeller

可变速泵    variable speed pump

可变冲程泵    variable stroke pump

垂轴螺桨,摆线螺桨    vertical axis (or cycloidal, or vorth- schneider) propeller

立式锅炉    vertical boiler

可视警报    visible alarm

可视听警报[器]    visible and audible alarm

垂直翼螺桨    voith-schneider propeller

涡卷泵    volute pump

涡流柱(螺桨)    vortex cylinder