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    Industrial engineer turning valve on pipe at fuel tank at a power plant — Stock Photo
    Industrial engineer turning valve on pipe at fuel tank at a power plant
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    First-aiders practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aiders practicing cardiopulmonary resuscitation on training dummy.
    Interior of brewery, large steel pipes, valves and control unit for the brewing process — Stock Photo
    Interior of brewery, large steel pipes, valves and control unit for the brewing process
    Dried marijuana flower buds on table with analytical balance and moisture measuring device against protective glasses in lab — Stock Photo
    Dried marijuana flower buds on table with analytical balance and moisture measuring device against protective glasses in lab
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Front view of senior Caucasian farmer fixing large irrigation water pipe valve in the field at farm — Stock Photo
    Front view of senior Caucasian farmer fixing large irrigation water pipe valve in the field at farm
    Man holding sack of barley into wort to make beer at home brewery — Stock Photo
    Man holding sack of barley into wort to make beer at home brewery
    Control panel american fire truck — Stock Photo
    Control panel american fire truck
    Man wearing apron making beer at home brewery — Stock Photo
    Man wearing apron making beer at home brewery
    Medical illustration of human heart interior — Stock Photo
    Medical illustration of human heart interior
    Mannequin placed next to industrial pipework — Stock Photo
    Mannequin placed next to industrial pipework
    Close-up of man fixing pipe to beer wort to make beer at home brewery — Stock Photo
    Close-up of man fixing pipe to beer wort to make beer at home brewery
    Human heart anatomy showing valves, cross section illustration. — Stock Photo
    Human heart anatomy showing valves, cross section illustration.
    Millennial man in garage holding a motor head in his hands in sunlight — Stock Photo
    Millennial man in garage holding a motor head in his hands in sunlight
    Human heart anatomy showing tricuspid valve, cross section illustration. — Stock Photo
    Human heart anatomy showing tricuspid valve, cross section illustration.
    Human heart with colored pulmonary valve, computer illustration. — Stock Photo
    Human heart with colored pulmonary valve, computer illustration.
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    Male adult engineer in water treatment plant — Stock Photo
    Male adult engineer in water treatment plant
    Cardiopulmonary resuscitation training dummies. — Stock Photo
    Cardiopulmonary resuscitation training dummies.
    Student in wheelchair examining fuel control valves on furnace in HVAC classroom — Stock Photo
    Student in wheelchair examining fuel control valves on furnace in HVAC classroom
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    Man pouring sack of barley into wort to make beer at home brewery — Stock Photo
    Man pouring sack of barley into wort to make beer at home brewery
    Heart cutout view with pulmonary valve, mitral valve and tricuspid — Stock Photo
    Heart cutout view with pulmonary valve, mitral valve and tricuspid
    Human heart anatomy showing aortic valve, cross section illustration. — Stock Photo
    Human heart anatomy showing aortic valve, cross section illustration.
    Water department engineer standing in chemical treatment room — Stock Photo
    Water department engineer standing in chemical treatment room
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    Row of colored metal faucets with valves and pipes transferring hot and cold water on plant — Stock Photo
    Row of colored metal faucets with valves and pipes transferring hot and cold water on plant
    Human heart with colored tricuspid valve, computer illustration. — Stock Photo
    Human heart with colored tricuspid valve, computer illustration.
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    Aortic valve, computer illustration. — Stock Photo
    Aortic valve, computer illustration.
    Endobronchial valves fitted to treat tuberculosis — Stock Photo
    Endobronchial valves fitted to treat tuberculosis
    First-aiders practicing cardiopulmonary resuscitation on training dummy. — Stock Photo
    First-aiders practicing cardiopulmonary resuscitation on training dummy.
    Engineer in electric power plant inspecting a electrically controlled valve — Stock Photo
    Engineer in electric power plant inspecting a electrically controlled valve
    Close-up of valve oil barrels in industrial mechanical workshop — Stock Photo
    Close-up of valve oil barrels in industrial mechanical workshop
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    Computer illustration of a blood clot inside vein, known as venous thrombus. — Stock Photo
    Computer illustration of a blood clot inside vein, known as venous thrombus.
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    Stavanger norway oil rig pumps — Stock Photo
    Stavanger norway oil rig pumps
    Back view of crop unrecognizable male engineer ascending ladder against metal vessel in beer factory — Stock Photo
    Back view of crop unrecognizable male engineer ascending ladder against metal vessel in beer factory
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    Man lifting wort to make beer at home brewery — Stock Photo
    Man lifting wort to make beer at home brewery
    3d rendered illustration of diseased heart valve on white background. — Stock Photo
    3d rendered illustration of diseased heart valve on white background.
    Human heart anatomy showing mitral valve, digital illustration. — Stock Photo
    Human heart anatomy showing mitral valve, digital illustration.
    Man checking gauge while making beer at home brewery — Stock Photo
    Man checking gauge while making beer at home brewery
    Human heart anatomy showing tricuspid valve, digital illustration. — Stock Photo
    Human heart anatomy showing tricuspid valve, digital illustration.
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Close-up of man fixing pipe to beer wort to make beer at home brewery — Stock Photo
    Close-up of man fixing pipe to beer wort to make beer at home brewery
    Close-up of man fixing valve to beer wort to make beer at home brewery — Stock Photo
    Close-up of man fixing valve to beer wort to make beer at home brewery
    Crop unrecognizable male worker in mask washing valve of metal tank at work in brewing company — Stock Photo
    Crop unrecognizable male worker in mask washing valve of metal tank at work in brewing company
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    Dried marijuana flower buds on table with analytical balance and moisture measuring device in lab — Stock Photo
    Dried marijuana flower buds on table with analytical balance and moisture measuring device in lab
    Man wearing apron checking temperature while making beer at home brewery — Stock Photo
    Man wearing apron checking temperature while making beer at home brewery
    Overhead view of valve covers, rockers, and heads in a mechanics shop — Stock Photo
    Overhead view of valve covers, rockers, and heads in a mechanics shop
    Human heart anatomy showing bicuspid valve, illustration. — Stock Photo
    Human heart anatomy showing bicuspid valve, illustration.
    Close-up of valve of oil gallon in industrial workshop — Stock Photo
    Close-up of valve of oil gallon in industrial workshop
    Man holding beer bottle while making beer at home brewery — Stock Photo
    Man holding beer bottle while making beer at home brewery