System for testing the partial travel of a closure member of a valve (Vf), comprising: - said valve (Vf) having said closure member capable of moving from a closed position to an open position, or vice versa, - a pneumatic or hydraulic actuator (At), for controlling the closure member when opened and/or closed, - at least one solenoid valve (Ev1, Ev2; Ev1') for controlling the actuator (At), - a limit switch device (Bfc) comprising electrical contacts, sending out signals representing discrete end-of-travel positions of the closure member, - a controller (M PST), including a memory in which instructions for implementing a partial end-of-travel test are recorded, configured to send out as output, a signal for controlling (O1, O2; O1') said at least one solenoid valve (Ev1, Ev2; Ev1') and receiving as input (Ifc) said signals of the end-of-travel device (Bfc), with the instructions being carried out automatically by the controller (M PST) according to a sequence that allows for the change in the signal for controlling (O1, O2; O1') said at least solenoid valve (Ev1, Ev2; Ev1') according to the signals of the end-of-travel device (Bfc) received as input (Ifc), characterised in that it comprises an electrical device for controlling (Cvf) said at least one solenoid valve, able to control the valve when totally closed or totally open when an electrical signal is sent out over at least one control line (LC1, LC2; LC1') of the electrical control device, and in that the controller is electrically connected to said at least one solenoid valve (Ev1, Ev2; Ev1'), in parallel with respect to the control line (LC1, LC2; LC1') of the control device, so as to allow the valve (Vf) to be controlled, when totally closed or totally open, by the electrical control device, independently of the controller, and in such a way as to allow, in the case of a failure of the controller (M PST), the electrical control device (Cvf) to still directly control the solenoid valve or valves (Ev1, Ev2; Ev1'), and thus the valve (Vf) when closed and/or open, and in that the controller (M PST) has for input(s) (I LC1, I LC2; I LC1') said signal or signals sent out over the control line or lines (LC1, LC2; LC1') of the electrical control device, said controller being configured so that the controlling of the closing according to a first alternative, or the opening according to a second alternative of the electrical control device has priority over the implementing of a partial travel test by said controller, the partial travel test being a partial closing test, according to the first alternative, or a partial opening test according to the second alternative. - said valve (Vf) having said closure member capable of moving from a closed position to an open position, or vice versa, - a pneumatic or hydraulic actuator (At), for controlling the closure member when opened and/or closed, - at least one solenoid valve (Ev1, Ev2; Ev1') for controlling the actuator (At), - a limit switch device (Bfc) comprising electrical contacts, sending out signals representing discrete end-of-travel positions of the closure member, - a controller (M PST), including a memory in which instructions for implementing a partial end-of-travel test are recorded, configured to send out as output, a signal for controlling (O1, O2; O1') said at least one solenoid valve (Ev1, Ev2; Ev1') and receiving as input (Ifc) said signals of the end-of-travel device (Bfc), with the instructions being carried out automatically by the controller (M PST) according to a sequence that allows for the change in the signal for controlling (O1, O2; O1') said at least solenoid valve (Ev1, Ev2; Ev1') according to the signals of the end-of-travel device (Bfc) received as input (Ifc),