Microfluidic valve

A microfluidic valve, comprising a carrier layer and a flexible membrane layer arranged on a surface of the carrier layer,

• wherein the surface of the carrier layer has a valve chamber in the form of a spherical cap and a membrane formed by the flexible membrane layer covers at least the valve chamber,
• wherein a plurality of microfluidic channels opening into the valve chamber are formed in the surface of the carrier layer,
• wherein the microfluidic channels comprise an inflow channel, an outflow channel and at least one supply channel,
• wherein the microfluidic channels and the membrane are formed in such a manner that the membrane can be brought into a closed state by application of pressure, in which closed state the membrane is pressed into the valve chamber in order to prevent the transfer of a fluid to be introduced from the at least one supply channel into the valve chamber,
• wherein the inlet channel and the outlet channel are connected to each other by a microfluidic connection channel,
• wherein the connection channel and the valve chamber are positioned relative to each other in such a way that in a closed state of the membrane, a fluid to be supplied can flow from the inflow channel via the connection channel into the outflow channel, while the at least one supply channel is closed by the membrane,
• wherein, in an open state of the membrane, a fluid to be supplied can flow from the inflow channel and/or at least one fluid to be introduced can flow from the at least one supply channel into the valve chamber, wherein a fluid located in the valve chamber is able to flow out of the valve chamber via the outflow channel,
• wherein a flow cross-section of the inflow channel and of the outflow channel are of the same size and the connection channel is dimensioned in such a way that its flow cross-section is substantially constant in the closed state of the membrane and corresponds to the flow cross-section of the inflow channel and outflow channel.