An integrated system for regulating and mixing comburent and fuel for a burner, comprising: a valve for the fuel comprising an inlet passage and an outlet passage for the fuel; ventilation means comprising a first inlet for the comburent, a second inlet for the fuel and an outlet connectable to the burner; the second inlet for the fuel being connected to the outlet passage of the valve for receiving the fuel passing through the valve; the valve comprising a valve stage comprising a shutter interposed between the inlet passage and the outlet passage and movable along a movement axis, between an open position, to allow the passage of the fuel, and a closed position to block the passage of the fuel; the valve also comprises a unit for moving the shutter operatively associated with the shutter for moving it from the closed position to the open position; characterised in that the valve stage comprises means for holding in position operatively active between a fixed portion of the valve and the shutter and which can be configured between an activation condition during which they keep the shutter in an open position, and a deactivation position; during the activation condition, the means for holding in position being configured for acting on the shutter when the latter is in an intermediate position between the open position and the closed position; the unit for moving the shutter being configured for moving the shutter from the open position to the intermediate position; and characterised in that it comprises a unit for detecting comburent along the first inlet configured for detecting the presence of comburent in transit along the first inlet; the system comprising means for activating the means for holding in position operatively connected to the unit for detecting the comburent and configured for activating the means for holding in position when the unit for detecting comburent detects the presence of comburent in transit along the first inlet. a valve for the fuel comprising an inlet passage and an outlet passage for the fuel; ventilation means comprising a first inlet for the comburent, a second inlet for the fuel and an outlet connectable to the burner; the second inlet for the fuel being connected to the outlet passage of the valve for receiving the fuel passing through the valve; the valve comprising a valve stage comprising a shutter interposed between the inlet passage and the outlet passage and movable along a movement axis, between an open position, to allow the passage of the fuel, and a closed position to block the passage of the fuel; the valve also comprises a unit for moving the shutter operatively associated with the shutter for moving it from the closed position to the open position; characterised in that the valve stage comprises means for holding in position operatively active between a fixed portion of the valve and the shutter and which can be configured between an activation condition during which they keep the shutter in an open position, and a deactivation position; during the activation condition, the means for holding in position being configured for acting on the shutter when the latter is in an intermediate position between the open position and the closed position; the unit for moving the shutter being configured for moving the shutter from the open position to the intermediate position; and characterised in that it comprises a unit for detecting comburent along the first inlet configured for detecting the presence of comburent in transit along the first inlet; the system comprising means for activating the means for holding in position operatively connected to the unit for detecting the comburent and configured for activating the means for holding in position when the unit for detecting comburent detects the presence of comburent in transit along the first inlet.