Device of fluidic valve type, comprising: - a fluidic component in which there is formed a fluidic circuit which comprises an inlet channel and an outlet channel, said fluidic component comprising: ∘ a fluidic valve mechanism, comprising: ■ a fluidtight reservoir intended to be filled with a volume of gas capable of expanding, ■ a deformable membrane closing said reservoir in a fluidtight manner, said membrane being able to deform by expansion of said volume of gas, between a first position in which it forms a passage between said inlet channel and said outlet channel so as to allow a fluid to pass, and a second position in which it obstructs said passage; - a heating module designed to heat said volume of gas contained in said reservoir and commanded to heat it to a temperature sufficient to expand said volume of gas present in the reservoir, causing the membrane to deform from its first position toward its second position, characterized in that: - the fluidic circuit comprises a reaction chamber, said fluidic valve mechanism being arranged on the fluidic circuit opening into said reaction chamber, and in that the heating module is designed to heat both: ∘ said reaction chamber in order to perform a detection reaction, and ∘ the reservoir of said fluidic valve mechanism so as to expand the volume of gas, causing the membrane to move toward its closure position with a view to isolating the chamber during said reaction. - a fluidic component in which there is formed a fluidic circuit which comprises an inlet channel and an outlet channel, said fluidic component comprising: ∘ a fluidic valve mechanism, comprising: ■ a fluidtight reservoir intended to be filled with a volume of gas capable of expanding, ■ a deformable membrane closing said reservoir in a fluidtight manner, said membrane being able to deform by expansion of said volume of gas, between a first position in which it forms a passage between said inlet channel and said outlet channel so as to allow a fluid to pass, and a second position in which it obstructs said passage; ∘ a fluidic valve mechanism, comprising: ■ a fluidtight reservoir intended to be filled with a volume of gas capable of expanding, ■ a deformable membrane closing said reservoir in a fluidtight manner, said membrane being able to deform by expansion of said volume of gas, between a first position in which it forms a passage between said inlet channel and said outlet channel so as to allow a fluid to pass, and a second position in which it obstructs said passage; ■ a fluidtight reservoir intended to be filled with a volume of gas capable of expanding, ■ a deformable membrane closing said reservoir in a fluidtight manner, said membrane being able to deform by expansion of said volume of gas, between a first position in which it forms a passage between said inlet channel and said outlet channel so as to allow a fluid to pass, and a second position in which it obstructs said passage; - a heating module designed to heat said volume of gas contained in said reservoir and commanded to heat it to a temperature sufficient to expand said volume of gas present in the reservoir, causing the membrane to deform from its first position toward its second position, characterized in that: - the fluidic circuit comprises a reaction chamber, said fluidic valve mechanism being arranged on the fluidic circuit opening into said reaction chamber, and in that the heating module is designed to heat both: ∘ said reaction chamber in order to perform a detection reaction, and ∘ the reservoir of said fluidic valve mechanism so as to expand the volume of gas, causing the membrane to move toward its closure position with a view to isolating the chamber during said reaction. ∘ said reaction chamber in order to perform a detection reaction, and ∘ the reservoir of said fluidic valve mechanism so as to expand the volume of gas, causing the membrane to move toward its closure position with a view to isolating the chamber during said reaction.