Abstract: The roller screw mechanism provides a screw having an outer thread, a nut surrounding and coaxial with the screw, the nut including an inner thread, and a plurality of rollers radially disposed between the screw and the nut and cooperating with the outer and inner threads. Magnets for attracting metal particles are disposed inside the roller screw mechanism.

Abstract: A planetary roller screw mechanism includes a screw shaft provided with at least one external thread, a nut provided with at least three internal threads and at least three rollers arranged, radially with respect to a central axis of the screw shaft, between the screw shaft and the nut. Each roller is provided with at least two external threads. The number of external threads of the screw shaft is a multiple of the number of external threads of a roller. The number of internal threads of the nut is a multiple of the number of external threads of a roller.

Abstract: An actuating device having a longitudinal shaft, an internal sleeve, an external sleeve, internal screw connecting means provided between the longitudinal shaft and the intermediate sleeve, external screw connecting means provided between the intermediate sleeve and the external sleeve. The direct efficiency of the internal screw connecting means is higher than the direct efficiency of the external screw connecting means. The self-releasable coupling means are provided between the longitudinal shaft and the internal sleeve.

Abstract: The roller screw mechanism provides a screw having an outer thread, a nut surrounding and coaxial with the screw, the nut including an inner thread, and a plurality of rollers radially disposed between the screw and the nut and cooperating with the outer and inner threads. Magnets for attracting metal particles are disposed inside the roller screw mechanism.

Abstract: A valve actuated device for a valve having a valve body and a valve translating member; a housing; a rotary and non-translating sleeve mounted in the housing and connected to an input rotary means; an axial shaft means positioned coaxially to the sleeve and adapted to be connected to the valve translating member; screw connecting means provided between the axial shaft means and the sleeve for convert applied rotation of the sleeve into axial translation of the axial shaft means; anti-rotation and axial guidance means installed between the housing and the shaft means; the anti-rotation and axial guidance means providing a linear ball bearing including a sleeve mounted to the housing and at least one rolling element recirculation system, the rolling elements thereof engaging axial groove of the shaft means.

Abstract: A planetary roller screw mechanism includes a screw shaft provided with at least one external thread, a nut provided with at least three internal threads and at least three rollers arranged, radially with respect to a central axis of the screw shaft, between the screw shaft and the nut. Each roller is provided with at least two external threads. The number of external threads of the screw shaft is a multiple of the number of external threads of a roller. The number of internal threads of the nut is a multiple of the number of external threads of a roller.

Abstract: The valve operator assembly is provided for a valve and includes a housing, an input member rotatably mounted, and a transmission mechanism including a translating element and a rotating element connected to the input member, said transmission mechanism being adapted to convert applied rotation of the input member into axial translation of said translating element. The assembly further includes at least one locking mechanism radially interposed between the transmission mechanism and the housing, and provided with friction means in radial contact with the housing, and with at least one pre-stressing element acting on said friction means to maintain said radial contact. The pre-stressing element and the friction means cooperate together to lock the transmission mechanism with the housing in a static position of said assembly.

Abstract: A valve operator assembly for a valve includes a valve body and an axially moveable valve translating member, a housing mounted on the valve, an input member rotatably mounted with respect to the housing, and a transmission mechanism. The transmission mechanism including a translating element connected to the valve translating member and a rotating element connected to the input member. The transmission mechanism configured to convert applied rotation of the input member into axial translation of the translating element. The valve operator assembly providing a spacing element having a tubular shape defining an axial bore through which passes the valve translating member and the translating element of the transmission mechanism. The spacing element connected by intermediate fixing means on the valve body on one end and on the housing on the other end to define cooperating mounting surfaces between the spacing element.

Abstract: A roller screw mechanism comprising a screw having an outer thread, a nut disposed around and coaxially with the screw. The nut includes an inner thread. A plurality of rollers are disposed radially between the screw and the nut and are each provided with an outer thread engaged with the outer and inner threads of the screw and of the nut and with two outer gear teeth. The mechanism additionally comprises two synchronizing gear teeth that are formed on the nut and are each engaged with one of the gear teeth of the rollers. The root diameter of each gear teeth is less than the inside diameter of the inner thread of the nut.

Abstract: The valve operator assembly is provided for a valve and comprises a housing 18, an input member 20 rotatably mounted, and a transmission mechanism 22 comprising a translating element 24 and a rotating element 28 connected to the input member, said transmission mechanism being adapted to convert applied rotation of the input member into axial translation of said translating element. The assembly further comprises at least one locking mechanism 23 radially interposed between the transmission mechanism 22 and the housing 18, and provided with friction means 82 freely movable in circumferential direction relative to the transmission mechanism and to the housing and with one freewheel 80 comprising a plurality of locking members mounted in radial contact with a track of said friction means, the freewheel and the friction means cooperating together to lock the transmission mechanism 22 with the housing 18 in a static position of said assembly.

Abstract: A valve operator assembly for a valve includes a valve body and an axially moveable valve translating member, a housing mounted on the valve, an input member rotatably mounted with respect to the housing, and a transmission mechanism. The transmission mechanism including a translating element connected to the valve translating member and a rotating element connected to the input member. The transmission mechanism configured to convert applied rotation of the input member into axial translation of the translating element. The valve operator assembly providing a spacing element having a tubular shape defining an axial bore through which passes the valve translating member and the translating element of the transmission mechanism. The spacing element connected by intermediate fixing means on the valve body on one end and on the housing on the other end to define cooperating mounting surfaces between the spacing element.

Abstract: A valve actuated device for a valve having a valve body and a valve translating member; a housing; a rotary and non-translating sleeve mounted in the housing and connected to an input rotary means; an axial shaft means positioned coaxially to the sleeve and adapted to be connected to the valve translating member; screw connecting means provided between the axial shaft means and the sleeve for convert applied rotation of the sleeve into axial translation of the axial shaft means; anti-rotation and axial guidance means installed between the housing and the shaft means; the anti-rotation and axial guidance means providing a linear ball bearing including a sleeve mounted to the housing and at least one rolling element recirculation system, the rolling elements thereof engaging axial groove of the shaft means.

Abstract: A roller screw mechanism comprising a screw, provided with an outer thread, a nut positioned around and coaxially to the screw, the nut being provided with an inner thread, and a plurality of rollers inserted between the screw and the nut, each comprising an outer thread engaged with the outer thread of the screw and with the inner thread of the nut. Each of the threads of the screw, rollers and nut comprise first and second axially opposite flanks, respectively forming a first and second angle with a plane perpendicular to the central axis of the screw, the first and second flanks of each thread of the rollers respectively being in contact with the first and second flanks of the nut's thread and with the first and second flanks of the screw's thread. The value of the first angle is different from the value of the second angle.

Abstract: The valve operator assembly is provided includes a housing, an input member rotatably mounted, and a transmission mechanism including a translating element and a rotating element connected to the input member, said transmission mechanism being adapted to convert applied rotation of the input member into axial translation of said translating element. The assembly further includes a locking mechanism provided with a casing mounted on the transmission mechanism and/or the housing, with a freewheel including a plurality of locking members mounted in radial contact with the transmission mechanism and with the casing, and with friction means axially disposed between the casing and the housing and mounted in axial contact with said housing. The friction means, the freewheel and the casing cooperate together to lock the transmission mechanism with the housing in a static position of said assembly.

Abstract: A valve operator assembly is adapted for use with a valve. The assembly comprises a housing, an input member rotatably mounted with respect to the housing and comprising a rotational drive input, and a transmission mechanism connected to the input member and comprising a stem, the transmission mechanism being adapted to convert applied rotation of the rotational drive input into axial translation of the stem. The assembly further comprises at least one elastic actuator axially located between the input member and the stem to obtain a compression of the actuator during an axial translation of the stem towards the input member and a release of the actuator during an axial translation in the opposite direction.

Abstract: The invention concerns a valve operator assembly for valve. The valve provides a valve body and a valve translating member axially moveable. The valve operator assembly provides a housing adapted to be mounted on the valve, an input member rotatably mounted with respect to the housing, and a transmission mechanism. The transmission mechanism provides a translating element connected to the valve translating member and a rotating element connected to the input member, the transmission mechanism being adapted to convert applied rotation of the input member into axial translation of the translating element. The valve operator assembly further provides a spacing element adapted to be connected on the valve body on one end and on the housing on the other end, the spacing element having an almost tubular shape defining an axial bore through which at least partly passes the valve translating member and the translating element of the transmission mechanism.

Abstract: An actuating device having a longitudinal shaft, an internal sleeve, an external sleeve, internal screw connecting means provided between the longitudinal shaft and the intermediate sleeve, external screw connecting means provided between the intermediate sleeve and the external sleeve. The direct efficiency of the internal screw connecting means is higher than the direct efficiency of the external screw connecting means. The self-releasable coupling means are provided between the longitudinal shaft and the internal sleeve.

Abstract: The system comprises a roller screw mechanism 12 which is provided with a screw 16 which comprises at least a first outer threaded portion 18, a nut 20 and a plurality of rollers 24 which cooperate with the first outer portion 18 and an inner thread of the nut. The system further comprises a roller thrust bearing 14 which is mounted on a second outer portion 52 of the screw and which is provided with a bushing 50 and a plurality of rollers 56 which comprise flanks which cooperate with flanks of the second outer portion 52 of the screw and the bushing 50. The flanks of the screw, the bushing and the rollers are configured so that, during a rotation of the screw, the rollers 56 are fixed axially relative to the screw 16 and relative to the bushing 50.

Abstract: The valve operator assembly is provided comprises a housing 18, an input member 20 rotatably mounted, and a transmission mechanism 22 comprising a translating element 24 and a rotating element 28 connected to the input member, said transmission mechanism being adapted to convert applied rotation of the input member into axial translation of said translating element. The assembly further comprises a locking mechanism 23 provided with a casing 80 mounted on the transmission mechanism and/or the housing, with a freewheel 82 comprising a plurality of locking members mounted in radial contact with the transmission mechanism and with the casing, and with friction means 84 axially disposed between the casing and the housing and mounted in axial contact with said housing. The friction means 84, the freewheel 82 and the casing 80 cooperate together to lock the transmission mechanism with the housing in a static position of said assembly.

Abstract: The valve operator assembly is provided for a valve and includes a housing, an input member rotatably mounted, and a transmission mechanism including a translating element and a rotating element connected to the input member, said transmission mechanism being adapted to convert applied rotation of the input member into axial translation of said translating element. The assembly further includes at least one locking mechanism radially interposed between the transmission mechanism and the housing, and provided with friction means in radial contact with the housing, and with at least one pre-stressing element acting on said friction means to maintain said radial contact. The pre-stressing element and the friction means cooperate together to lock the transmission mechanism with the housing in a static position of said assembly.