Patent ID: 8870154

Claim:
Valve actuator, for a flap of a fire stop valve which is placed in an arming position and which is actuated by an actuation command associated with an event, having a casing ( 3 ) and a drive shaft ( 4 ) which is carried by the casing ( 3 ) and which is fixedly joined to the flap ( 2 - 1 ) and connected to a mechanical actuation energy storage spring ( 70 ) which is biased into the arming position and which returns the flap ( 2 - 1 ) into an active position and actuation members ( 60 - 80 ) which are controlled by events (external temperature, internal temperature, electrical actuation and/or manual actuation), comprising: a carriage which is guided in translation, which is fixedly joined to the drive shaft comprises a rack ( 11 ) which engages with a toothed pinion ( 20 ) of the output shaft ( 4 ) which is connected to the flap ( 2 - 1 ) of the valve ( 2 ), which is provided with an arming stop, an arming device which is connected to the carriage by means of a connection which can be released by means of an actuation device as soon as the carriage is in the arming position, and a lever which is carried by the casing and which co-operates with the stop of the carriage in order to retain it in the arming position, characterised in that the carriage ( 10 ) which is guided in translation (in direction D) in the casing ( 3 ) between the arming position (direction A) and the actuated position (direction B) comprises: an abutment ( 13 ) for the mechanical actuation energy storage spring ( 70 ), an abutment member ( 12 ) for the arming member ( 30 ) which drives the carriage ( 10 ) from its actuated position to its arming position in order to then become separated from the abutment member ( 12 ) at the end of the arming travel, a locking recess ( 14 - 1 ) for receiving a locking member ( 42 ) which is carried by a locking arm ( 40 ), which is pivotably mounted in the casing ( 3 ) and which is urged by a spring ( 44 ) towards a locking position thereof, an unlocking lever ( 50 ) which is mounted in the casing and which co-operates, on the one hand, with a solenoid actuator ( 60 ) which retains the lever in the locking position and, on the other hand, with a spring ( 53 ) which urges the lever ( 50 ) towards an unlocked position and drives the arm ( 40 ) towards the unlocked position, a control circuit ( 5 ) which provides the actuation command by means of an action on the solenoid valve ( 60 ) and on the actuation member ( 30 ) for the arming movement of the carriage ( 10 ).