valve outlet Mach number,阀出口马赫数

valve plug,阀芯

valve seat,阀座面

valve shaft,阀轴

valve sizing,阀尺寸计算；阀口径计算

valve stem,阀杆

valve stem position transmitter,阀位发送器

valve stem unbalance,阀杆不平衡力

vane,阀板；方向标

vapour concentration,水汽浓度

vapour pressure,水汽压

vapour tension,水汽张力

vaporizer,汽化室

vaporizing heat,气化热

variable,变量

variable-angle internal reflection element,可变角度内反射元件

variable angle probe,可变有探头

variable area flowmeter,变面积流量计

variable-area methods,可变面积法

variable gain,可变增益；可变放大系数

variable gain method,可变增益法

variable-head flowmeter,可变压头流量计

variable magnetic-resistance type transducer,变磁阻式传感器

variable pressure,变化压力；变压

variable standard capacitor,可变标准电容器

vaiable structure control system,变结构控制系统

variation (due to influence quantity),（影响量引起的）变化量；变差

variation in testing temperature,试验温度波动度

variation in the indicating value,示值变动值

variety,品种

varistor,电压敏电阻器

vectopluviometer,雨向计

vector averaging current meter,矢量平均海流计

veiling glare,杂光

veiling glare coefficient,杂光系数

velocity,速度

velocity-area methods,速度面积法

velocity distribution,速度分布

velocity error,速度误差

velocity error coefficient,速度误差系数

velocity feedback,速度反馈

velocity focusing,速度聚焦

velocity limiter,速度限制器

velocity measure thermistor,测速热敏电阻器

velocity of approach factor,渐近速度系数

velocity pickup,速度传感器

velocity transducer [sensor],速度传感器

velocity type water meter,速度式水表

vena contracta,缩流断面

vena contracta pressure tappings,缩流取压口

vent holes,排气孔

ventilated psychrometer,通风干湿表

ventilated thermometer,通风温度表

ventilation rate,换气量

ventilator,通风器

Venturi nozzle,文丘里喷嘴

Venturi tube,文丘里管

Verification,检验；检定

verifier,校对机

verify,校对

vernier,游标

vertical angle,竖直角

vertical axis,竖轴

vertical balancing machine,立式平衡机

vertical current flow method,直角通电法

vertical extent of a cloud,云的垂直厚度

vertical limit,垂直极限

vertical scanning,帧扫描

vertical tail,垂直翼

vertical temperature profiler radiometer (VTPR),垂直温度剖面仪

vertical visibility,垂直能见度

very low frequency electromagnetical receiver,甚低频电磁仪

VF presentation,视频显示；检波显示

vibrating reed instrument,振簧系仪表

vibrating sample magnetometer,振动样品磁强计

vibrating viscometer,振动粘度计

vibrating wire [resonant wire] drawing force meter,振弦式拉力计

vibrating wire [resonant wire] force transducer,振弦式力传感器

vibrating wire [resonant wire] tensiometer,振弦式张力计

vibrating wire [resonant wire] tension transducer,振弦式张力传感器

vibrating wire [resonant wire] torque measuring instrument,振弦式转矩测量仪

vibrating wire [resonant wire] torque transducer,振弦式转矩传感器

vibrating wire transducer,振弦式（压力）传感器

vibration,振动

vibration amplitude,振幅

vibration analyzer,振动分析仪

vibration controller,振动控制仪

vibration cylinder barometer,振筒式气压表

vibration cylinder pressure transducer,振筒式气压传感器

vibration error,振动误差

vibration galvanometer,振动检流计

vibration generator,振动台；振动发生器

vibration isolation,隔振

vibration isolator,隔振器

vibration measurement by absolute method,绝对测振法

vibration measurement by mechanical method,机械测振法

vibration measurement by relative method,相对测振法

vibration monitor,振动监视器