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    Male adult engineer in water treatment plant — Stock Photo
    Male adult engineer in water treatment plant
    Painted valves and pipes — Stock Photo
    Painted valves and pipes
    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
    Metal fermentation valves in rows — Stock Photo
    Metal fermentation valves in rows
    Construction workers preparing to lift gate valve for water main — Stock Photo
    Construction workers preparing to lift gate valve for water main
    Aortic valve, computer illustration. — Stock Photo
    Aortic valve, computer illustration.
    Endobronchial valves fitted to treat tuberculosis — Stock Photo
    Endobronchial valves fitted to treat tuberculosis
    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
    Female power engineer checking valve at power station — Stock Photo
    Female power engineer checking valve at power station
    Various metal containers placed near shabby building wall and water tap on street of town in Gambia — Stock Photo
    Various metal containers placed near shabby building wall and water tap on street of town in Gambia
    Light bulbs and valve bulbs, X-ray. — Stock Photo
    Light bulbs and valve bulbs, X-ray.
    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
    Female power engineer checking injectors with compressed gas at power station — Stock Photo
    Female power engineer checking injectors with compressed gas at power station
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    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.
    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
    View of Heart valves — Stock Photo
    View of Heart valves
    Prosthetic heart valves — Stock Photo
    Prosthetic heart valves
    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
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Female power engineer checking pressure transducers at power plant — Stock Photo
    Female power engineer checking pressure transducers at power plant
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    Female power engineer adjusting pressure valve at power station — Stock Photo
    Female power engineer adjusting pressure valve at power station
    Gas well valve in gas pipeline in desert of United Arab Emirates. — Stock Photo
    Gas well valve in gas pipeline in desert of United Arab Emirates.
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Human heart with colored pulmonary valve, computer illustration. — Stock Photo
    Human heart with colored pulmonary valve, computer illustration.
    Female power engineer checking pressure transducers at power plant — Stock Photo
    Female power engineer checking pressure transducers at power plant
    Rusty metal valve of old radiator for temperature regulation in room at home — Stock Photo
    Rusty metal valve of old radiator for temperature regulation in room at home
    Close-up view of male farmer repairing valve pipe in farm on a sunny day — Stock Photo
    Close-up view of male farmer repairing valve pipe in farm on a sunny day
    Copper brew kettle — Stock Photo
    Copper brew kettle
    Engineer in electric power plant inspecting manual valve in condenser room piping — Stock Photo
    Engineer in electric power plant inspecting manual valve in condenser room piping
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    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 lifting wort to make beer at home brewery — Stock Photo
    Man lifting wort to make beer at home brewery
    Human heart anatomy showing tricuspid valve, cross section illustration. — Stock Photo
    Human heart anatomy showing tricuspid valve, cross section illustration.
    Schematic representation of human vein structure — Stock Photo
    Schematic representation of human vein structure
    Aerial view of a pipeline with a value and coupling in a green field, West of Calgary; Alberta, Canada — Stock Photo
    Aerial view of a pipeline with a value and coupling in a green field, West of Calgary; Alberta, Canada
    Stavanger norway oil rig pumps — Stock Photo
    Stavanger norway oil rig pumps
    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
    Human heart anatomy showing aortic valve, digital illustration. — Stock Photo
    Human heart anatomy showing aortic valve, digital illustration.
    Human heart with colored pulmonary valve, computer illustration. — Stock Photo
    Human heart with colored pulmonary valve, computer illustration.
    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
    Gloved hands of foreman working on equipment with valve on factory — Stock Photo
    Gloved hands of foreman working on equipment with valve on factory
    Valve on beer worts to make beer at home brewery — Stock Photo
    Valve on beer worts to make beer at home brewery
    Human heart anatomy showing pulmonary valve, digital illustration. — Stock Photo
    Human heart anatomy showing pulmonary valve, digital illustration.
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    Heart cutout view with pulmonary valve, mitral valve and tricuspid — Stock Photo
    Heart cutout view with pulmonary valve, mitral valve and tricuspid
    Back view of male engineer taking notes on paper on metal vessel in beer factory — Stock Photo
    Back view of male engineer taking notes on paper on metal vessel in beer factory
    Human heart with colored tricuspid valve, computer illustration. — Stock Photo
    Human heart with colored tricuspid valve, computer illustration.
    Vintner checking stainless steel vat in winery cellar — Stock Photo
    Vintner checking stainless steel vat in winery cellar
    View of Mitral valve — Stock Photo
    View of Mitral valve
    Scuba diving tanks — Stock Photo
    Scuba diving tanks
    Medical illustration of artificial heart valve. — Stock Photo
    Medical illustration of artificial heart valve.
    Mechanic checking a car parts in repair garage — Stock Photo
    Mechanic checking a car parts in repair garage
    Portrait of a confident man wearing apron standing at home brewery — Stock Photo
    Portrait of a confident man wearing apron standing at home brewery
    Vintner in lab coat and hard hat examining stainless steel vat in cellar — Stock Photo
    Vintner in lab coat and hard hat examining stainless steel vat in cellar
    Human vein showing tissue stratification — Stock Photo
    Human vein showing tissue stratification
    Closeup view of one grilled scallop on shell — Stock Photo
    Closeup view of one grilled scallop on shell