valve outlet Mach number,閥出口馬赫數

valve plug,閥芯

valve seat,閥座面

valve shaft,閥軸

valve sizing,閥尺寸計算；閥口徑計算

valve stem,閥杆

valve stem position transmitter,閥位發送器

valve stem unbalance,閥杆不平衡力

vane,閥板；方向標

vapour concentration,水汽濃度

vapour pressure,水汽壓

vapour tension,水汽張力

vaporizer,汽化室

vaporizing heat,气化熱

variable,變量

variable-angle internal reflection element,可變角度內反射元件

variable angle probe,可變有探頭

variable area flowmeter,變面積流量計

variable-area methods,可變面積法

variable gain,可變增益；可變放大系數

variable gain method,可變增益法

variable-head flowmeter,可變壓頭流量計

variable magnetic-resistance type transducer,變磁阻式傳感器

variable pressure,變化壓力；變壓

variable standard capacitor,可變標准電容器

vaiable structure control system,變結构控制系統

variation (due to influence quantity),（影響量引起的）變化量；變差

variation in testing temperature,試驗溫度波動度

variation in the indicating value,示值變動值

variety,品种

varistor,電壓敏電阻器

vectopluviometer,雨向計

vector averaging current meter,矢量平均海流計

veiling glare,雜光

veiling glare coefficient,雜光系數

velocity,速度

velocity-area methods,速度面積法

velocity distribution,速度分布

velocity error,速度誤差

velocity error coefficient,速度誤差系數

velocity feedback,速度反饋

velocity focusing,速度聚焦

velocity limiter,速度限制器

velocity measure thermistor,測速熱敏電阻器

velocity of approach factor,漸近速度系數

velocity pickup,速度傳感器

velocity transducer [sensor],速度傳感器

velocity type water meter,速度式水表

vena contracta,縮流斷面

vena contracta pressure tappings,縮流取壓口

vent holes,排气孔

ventilated psychrometer,通風干濕表

ventilated thermometer,通風溫度表

ventilation rate,換气量

ventilator,通風器

Venturi nozzle,文丘里噴嘴

Venturi tube,文丘里管

Verification,檢驗；檢定

verifier,校對机

verify,校對

vernier,游標

vertical angle,豎直角

vertical axis,豎軸

vertical balancing machine,立式平衡机

vertical current flow method,直角通電法

vertical extent of a cloud,云的垂直厚度

vertical limit,垂直极限

vertical scanning,幀掃描

vertical tail,垂直翼

vertical temperature profiler radiometer (VTPR),垂直溫度剖面儀

vertical visibility,垂直能見度

very low frequency electromagnetical receiver,甚低頻電磁儀

VF presentation,視頻顯示；檢波顯示

vibrating reed instrument,振簧系儀表

vibrating sample magnetometer,振動樣品磁強計

vibrating viscometer,振動粘度計

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

vibrating wire [resonant wire] force transducer,振弦式力傳感器

vibrating wire [resonant wire] tensiometer,振弦式張力計

vibrating wire [resonant wire] tension transducer,振弦式張力傳感器

vibrating wire [resonant wire] torque measuring instrument,振弦式轉矩測量儀

vibrating wire [resonant wire] torque transducer,振弦式轉矩傳感器

vibrating wire transducer,振弦式（壓力）傳感器

vibration,振動

vibration amplitude,振幅

vibration analyzer,振動分析儀

vibration controller,振動控制儀

vibration cylinder barometer,振筒式气壓表

vibration cylinder pressure transducer,振筒式气壓傳感器

vibration error,振動誤差

vibration galvanometer,振動檢流計

vibration generator,振動台；振動發生器

vibration isolation,隔振

vibration isolator,隔振器

vibration measurement by absolute method,絕對測振法

vibration measurement by mechanical method,机械測振法

vibration measurement by relative method,相對測振法

vibration monitor,振動監視器