Tube rupture protection device , comprising a valve unit consisting of a single block, said valve unit comprising: - a hydraulic line comprising at least one first port (P1) intended for the connection with a hydraulic actuator (C) and at least one second port (P2) intended for the connection with a tube (T) at risk of rupture; - a control valve operating in said hydraulic line and comprising at least one first position in which it allows a flow toward said first port (P1) and prevents a flow toward said second port (P2) and at least one second position in which it allows a flow toward said second port (P2); - a pilot line arranged to pilot said control valve and comprising at least one third port (P3) intended for the connection with at least one element external to the device ; - a discharge line connected to said pilot line and comprising at least one fourth port (P4) intended for the connection with a drain (R) to discharge fluid from said pilot line ; - a circuit element arranged to control a discharge flow in said discharge line ; - valve means arranged in said discharge line between said circuit element and said pilot line ; - a service line arranged to pilot said circuit element by a pressure coming from a portion of said hydraulic line comprised between said second port (P2) and said control valve , said circuit element being piloted to close said discharge line when in said portion of said hydraulic line there is a first pressure, in case of intact tube (T), and to at least partially open said discharge line when in said portion of said hydraulic line there is a second pressure, lower than said first pressure, in case of ruptured tube (T) - a hydraulic line comprising at least one first port (P1) intended for the connection with a hydraulic actuator (C) and at least one second port (P2) intended for the connection with a tube (T) at risk of rupture; - a control valve operating in said hydraulic line and comprising at least one first position in which it allows a flow toward said first port (P1) and prevents a flow toward said second port (P2) and at least one second position in which it allows a flow toward said second port (P2); - a pilot line arranged to pilot said control valve and comprising at least one third port (P3) intended for the connection with at least one element external to the device ; - a discharge line connected to said pilot line and comprising at least one fourth port (P4) intended for the connection with a drain (R) to discharge fluid from said pilot line ; - a circuit element arranged to control a discharge flow in said discharge line ; - valve means arranged in said discharge line between said circuit element and said pilot line ; - a service line arranged to pilot said circuit element by a pressure coming from a portion of said hydraulic line comprised between said second port (P2) and said control valve , said circuit element being piloted to close said discharge line when in said portion of said hydraulic line there is a first pressure, in case of intact tube (T), and to at least partially open said discharge line when in said portion of said hydraulic line there is a second pressure, lower than said first pressure, in case of ruptured tube (T) <EOS>