A proportional pinch valve for controlling the pressure in a continuous flow system, the proportional pinch valve comprising a tubing, an anvil for pinching a length of the tubing in the continuous flow system, and a drive mechanism including a displacement element, characterised in that the anvil is indirectly coupled to the displacement element via an elastic spring element, the drive mechanism includes an automated drive in the form of a stepper motor for displacing the displacement element between the following defined positions: a home position, in which the anvil is in a position not interfering with the tubing, an intermediate position, in which the anvil is pressed into the tubing to an extent that an effective flow cross section of the tubing is reduced, but a flow through the tubing is not completely blocked, the elastic spring element providing a defined play for the anvil at least as long as the tubing is not fully pinched so that displacement of the anvil is force-controlled by the elastic spring element in that the force applied to the anvil by the spring element is balanced by an average pressure inside the tubing plus a force to deform the tubing, and an end position, in which the tubing is fully pinched, and the flow is interrupted, the displacement element being in contact with the anvil in the end position. a tubing, an anvil for pinching a length of the tubing in the continuous flow system, and a drive mechanism including a displacement element, characterised in that the anvil is indirectly coupled to the displacement element via an elastic spring element, the drive mechanism includes an automated drive in the form of a stepper motor for displacing the displacement element between the following defined positions: a home position, in which the anvil is in a position not interfering with the tubing, an intermediate position, in which the anvil is pressed into the tubing to an extent that an effective flow cross section of the tubing is reduced, but a flow through the tubing is not completely blocked, the elastic spring element providing a defined play for the anvil at least as long as the tubing is not fully pinched so that displacement of the anvil is force-controlled by the elastic spring element in that the force applied to the anvil by the spring element is balanced by an average pressure inside the tubing plus a force to deform the tubing, and an end position, in which the tubing is fully pinched, and the flow is interrupted, the displacement element being in contact with the anvil in the end position. a home position, in which the anvil is in a position not interfering with the tubing, an intermediate position, in which the anvil is pressed into the tubing to an extent that an effective flow cross section of the tubing is reduced, but a flow through the tubing is not completely blocked, the elastic spring element providing a defined play for the anvil at least as long as the tubing is not fully pinched so that displacement of the anvil is force-controlled by the elastic spring element in that the force applied to the anvil by the spring element is balanced by an average pressure inside the tubing plus a force to deform the tubing, and an end position, in which the tubing is fully pinched, and the flow is interrupted, the displacement element being in contact with the anvil in the end position.