FR3013099A1 - VALVE WITH NUT OF INSTRUMENTAL MANEUVER - Google Patents

Abstract

Valve (10) having an operating rod (18) adapted to actuate a valve shutter (20), a servomotor (22) having an output shaft (24) adapted to control the operating rod ( 18), and an operating nut (32) forming an interface between the servomotor (22) and the operating rod (18) for transforming a rotational movement of the output shaft (24) of the servomotor (22) into a translational movement of the operating rod (18). The operating nut (32) then comprises a force measuring device (48) for measuring the force applied to the operating rod (18) by the maneuvering nut (32), and a transmitter (56). non-contact measurement data read by the force measuring device (48).

Description

The present invention relates to a valve comprising an instrumented maneuvering nut. More particularly, the invention relates to a valve comprising an actuating rod adapted to actuate a valve shutter. The valve also comprises a servomotor provided with an output shaft adapted to control the operating rod. An actuating nut forms an interface between the servomotor and the operating rod to transform a rotational movement of the output shaft of the servomotor into a translational movement of the operating rod.

During a diagnosis of the good functioning of a valve, for example of a motorized valve, a measurement of the force is carried out at the level of the operating rod in order to make sure of the tightness of the valve once. closed. The value of this force, which ensures that the closing function of the valve is effective, is hereinafter called the operability criterion. This criterion of operability is in particular a function of the torque delivered by the servomotor and the overall efficiency of the driveline of the valve. The force measurement then makes it possible to guarantee or not the sealing of the valve. A desired effort that is not achieved may be due to a problem with the valve servomotor or a problem at any level of the driveline. Thus, it is necessary to know if the entire kinematic chain is correct, and that at each interface to determine, in the opposite case, the defective component which has an impact on the overall response. It is not always possible today to determine the precise cause of the failure. In particular, it is not always possible to determine at what level of the kinematic chain of the valve the failure comes from. Also, in case of failure, it is now common to have to completely disassemble the valve to test each or almost every member of the valve and determine the failing organ. This complete disassembly is long, complex and leads to heavy maintenance to manage. The present invention is intended in particular to overcome these disadvantages and to improve the situation.

For this purpose, according to the invention, a valve of the above type is characterized in that said actuating nut comprises a force measuring device for measuring the force applied to the operating rod by the maneuvering nut. , and a contactless emitter of measurement data read by the force measuring device. Thanks to these arrangements, it is possible to know during operation the actuating force of the valve, to monitor the efficiency of the actuating nut, to reduce the removal operations, for example of the valve actuator, when the failure is a problem due to the maneuvering nut. The measured effort is made in identical configurations at each measurement. Such a valve also makes it possible to measure the force without weakening any member of the valve. Thus, a measuring device is inserted in a new interface of the kinematic chain of the valve, which remains in position on said valve even when it is operating. The measurement, made directly on the nut allows a precise knowledge of the transmission force, closer to the transmission zone of the force between the actuating nut and the operating rod. In preferred embodiments of the invention, one or more of the following provisions may be used in addition: the force measuring device comprises a force sensor provided with sensitive elements located on the actuating nut; the sensitive elements make it possible to produce a device for measuring effort that is easy to implement; the operating nut comprises machined zones, and the sensitive elements are arranged in the machined zones; the machined zones allow a discrete assembly of the sensitive elements on the nut without substantially modifying the architecture of the maneuvering nut; the actuating nut comprises a sleeve, inside which the operating rod extends, the sleeve comprises a first end, a second end and an annular flange arranged between the first and the second end, and in which the The sleeve further includes a machined area between the annular flange and the second end, a sensing element being provided in said machined area between the annular flange and the second end; the shape of the operating nut makes it possible to measure at different levels of the operating rod / operating nut interface; the sensitive elements are strain gauges; strain gauge sensors form stress sensors for reliable and reliable measurements and easy implementation; - The force measuring device is fixed non-releasably on the actuating nut; thus, the force measuring device remains permanently on the actuating nut, and it is possible to follow the behavior of the actuating nut during the operation of the valve; an internal processing module installed on the maneuver nut processes the data from the force measuring device before directing them to the contactless transmitter; the internal processing module serves as an interface between the contactless transmitter and the direct measurement device; - An external system to the actuating nut feeds without contact the force measuring device and receives the measurement data transmitted by the contactless transmitter; the external system is distinct from the actuating nut and makes it possible to supply power to the elements present on the operating nut, for example the non-contact emitter, the force measuring device, and possibly the module 20 internal treatment; a processing module external to the maneuvering nut processes the data coming from the measuring device; the measurement data recorded by the measuring device are transmitted by telemetry; telemetry transmission is a solution to achieve an absence of contact; other non-contact or wireless transmission modes may be used; - The valve further comprises a coupling sleeve connected to the booster and the actuating nut for coupling in rotation the output shaft of the booster and the actuating nut; the socket makes it possible in particular to transmit the movement between the servomotor and the actuating nut in an engaged position, but also to decouple the servomotor and the actuating nut in a disengaged position; the coupling sleeve comprises a device for measuring the torque delivered by the servomotor output shaft to the actuating nut and a contactless emitter of measurement data read by the torque measurement device delivered by the shaft; output from the servomotor to the actuating nut; the value of the torque at the output of the servomotor is directly measured without any deep structural modification of the valve. The present invention also relates to an actuating nut transforming a rotational movement of the output shaft of a servomotor into a translational movement of an operating rod of a valve as previously described, said nut comprising a device for measurement of the force applied to the operating rod by the actuating nut, and a contactless transmitter of measurement data read by the measuring device.

The invention also relates to a valve processing module as described for the implementation of data processing from the effort measuring device comprising data collection means, data processing means and means for processing data. diagnostics of an operating state of the valve. The invention also relates to a method of implementation by the processing module of the measured data, the method comprising the following steps: - associating a receiver at the appropriate operating nut to collect the data of the measuring device of a valve as previously described, - collect the data of the force measuring device of the valve as described. Optionally, the method may further comprise data collection steps of the torque measuring device delivered by the servomotor output shaft to the maneuvering nut and processing these collected data. The method may also include a step of comparing the data collected by the force measuring device and the torque measuring device. Finally, the invention is directed to a computer program product comprising instructions for implementing the method described, during execution of this program by a processor.

Other features and advantages of the invention will become apparent from the following description of one of its embodiments, given by way of non-limiting example, with reference to the accompanying drawings. In the drawings: - Figure 1 is a sectional view of a valve according to the invention with a processor, - Figure 2 is a detail view II of the valve of Figure 1 showing a drive rod and a nut FIG. 3 is a diagrammatic view from the front and in section along an axis AA of the operating nut of the valve of FIG. 1 comprising sensitive elements in a first configuration; FIG. 4 is a diagrammatic view in section and in section along an axis BB of the operating nut of the valve of FIG. 1 comprising sensitive elements in a second configuration, FIG. 5 is a schematic front view. and in section along the axis CC of a socket that can equip the valve of FIG. 1, FIG. 6 is a flowchart showing possible steps that can be implemented by a processor to perform a diagnosis of the operating state. of the valve, 2 5 - the figure 7 is a schematic view of a nuclear power plant having a secondary circuit provided with the valve of Figure 1. In the various figures, the same references designate identical or similar elements. Figure 1 shows a valve 10. The valve 10 of Figure 1 is a conventional gate valve. Although the following description is made with reference to the valve 10 of Figure 1, the invention is not limited to the gate valves and concerns all valves of similar structures. The valve 10 comprises a valve body 12 on which is mounted an arch 14 whose end opposite the valve body 12 constitutes the base of a stop box 16. The valve 10 further comprises an operating rod 18 of a shutter 20. The operating rod 18 is controlled by a servomotor 22 which controls the opening and closing of the shutter 20 of the valve 10. The servomotor 22 comprises an output shaft 24. The output shaft 24, as shown, extends longitudinally along a longitudinal axis. The output shaft 24 can be rotatable about the longitudinal axis. The output shaft 24 of the servomotor 22 is directly or indirectly connected to the operating rod 18. More specifically, the output shaft 24 can directly or indirectly control the operating rod 18, which itself will have an influence on the shutter 20 of the valve 10, and therefore on the closed position of the valve 10.

The operating rod 18 passes through the yoke 14. The operating rod 18 may, for example, extend longitudinally along the longitudinal axis and have a first end 26 and a second end 28 along the longitudinal axis. The operating rod 18 may comprise a threaded portion 30, for example towards its first end 26. The operating rod 18 may also, towards its second end 28, 20 open into the valve body 12. The part opening into the body valve 12 can be integral with the shutter 20. The abutment box 16 comprises a casing in which is located an actuating nut 32. The actuating nut 32 forms an interface between the servomotor 22 and the operating rod 18. More particularly, as shown, the operating nut 32 makes it possible to transform a rotational movement of the output shaft 24 of the servomotor 22 into a translation movement of the operating rod 18. maneuver 32 is for example made of a material such as bronze. In the present case, the operating nut 32 comprises a sleeve 34. The sleeve 34 has an outer surface 36 and an inner surface 38, opposite to the outer surface 36. The inner surface 38 of the sleeve 34 defines the hollow portion said sleeve 34. The sleeve 34 may be substantially cylindrical. The actuating nut 32 may extend longitudinally along the longitudinal axis. The actuating nut 32 may comprise a first end 40 and a second end 42 along the longitudinal axis. The operating nut 32 may comprise, as shown in FIGS. 2, 3 and 4, an annular collar 44. The annular flange 44 may for example be provided between the first end 40 and the second end 42, close to the second end 42 and at a non-zero distance from the second end 42 along the longitudinal axis. For example, bearings associated with the abutment box 16 can bear on either side of the annular collar 44, for the rotational guidance of the actuating nut 32. The hollow portion of the sleeve 34 is, at the less in part, threaded and cooperates with the operating rod 18. More particularly, the threaded portion 30 of the operating rod 18 cooperates with the threaded portion 46 of the actuating nut 32. A rotation of the actuating nut 32 Then, the operating rod 18 is translated. Thus, the rotational movement about the longitudinal axis of the output shaft 24 of the servomotor 22 is translated into a translation movement 20 along the longitudinal axis of the drive shaft. operating rod 18 via the operating nut 32, and more particularly by the cooperation of the thread (also called internal thread) of the operating nut 32 with the thread provided towards the first end 26 of the rod of BREAKER 18. The translational movement along the longitudinal axis of the operating rod 18 allows the opening or closing of the valve 10 via the shutter 20. The shutter 20 is, in a mode of embodiment of the invention, a cap that slides along a seat for the opening or closing of the valve 10. The actuating nut 32 comprises a force measuring device 48. The measuring device of effort 48 makes it possible to measure the force applied to the operating rod 18 by the operating nut 32. Thus, the force measuring device 48 gives the operating nut 32 a second function, that of measuring the force applied to the operating rod 18 by the actuating nut 32. The force measuring device 48 may be fixed non-releasably to the operating nut 32. The force measuring device 48 comprises specific instrumentation, for example sufficiently sensitive sensors, also known as Sensitive elements 50, to allow measurement of the force transmitted to the operating rod 18. The sensitive elements 50 may be strain gauges. The strain gauges may have specific cabling, for example the strain gauges may be wired as full bridge or half bridge. In the case of full bridge wiring, for example, four active gauges are integrated into a Wheatstone bridge. Other wiring configurations may be used, such as quarter-turn wiring, for example. In a bridge quarter mount, only one gauge is active.

The sensitive elements 50 are in this case assembled on the operating nut 32 so that they do not make little or no projection of the operating nut 32, and therefore does not interfere with the operation of the nut of actuating 32, and therefore valve 10. For example, machined areas 52 (which can be drilled, for example) 20 are provided on the actuating nut 32 and the sensitive elements 50 are arranged in the machined areas 52. The position of the sensitive elements 50 in these machined zones 52 allow a better sensitivity of the measurement. The machining performed is sufficient to allow measurements to be made with great sensitivity while avoiding altering the mechanical properties of the operating nut 32. FIG. 3 shows the operating nut 32 with sensitive elements arranged according to a first configuration. More particularly, the sensitive elements are distributed over the annular collar 44 and above the annular flange 44 between the first end 40 of the actuating nut 32 and the annular flange 44. The sensitive elements 50 can also be located between the second end 42 of the operating nut 32 and the annular flange 44, as shown in FIG. 4, in a second configuration, which is alternative or additional to the first configuration of FIG. Embodiments of the invention, the sensitive elements 50 may be located, alternately, or in a complementary manner, on other areas of the actuating nut 32. Once the data measured by the effort measuring device 48 (and more particularly via the sensitive elements 50), these must be processed. An internal processing module 54 can be installed on the operating nut 32. This internal processing module 54 can process the data coming from the effort measuring device 48 (for example by formatting them to facilitate their transmission) before the direct to an internal transmitter / receiver 56. The internal transmitter / receiver 56 may for example be located towards the first end 40 of the operating nut 32, as shown in Figure 3.

However, in alternative embodiments, the internal transmitter / receiver 56 can be located to other zones of the operating nut 32. The data processed by the internal processing module 54 on the operating nut 32 and / or measured on the operating nut 32 will then be transferred to the outside of the actuating nut 32. In this case, the internal transmitter / receiver 56 to the actuating nut 32 2 0 may be provided for transmit without contacting the data recorded by the force measuring device 48 and transmitted by the internal processing module 54 installed on the operating nut 32. A system external to the operating nut 32 can power without contact the device of measurement 48 and receives the measurement data transmitted by the internal emitter / receiver 56 without contact. The internal transmitter / receiver 56 can cooperate with an external transmitter / receiver 58, which is external to the operating nut 32. The external transmitter / receiver 58 can have two functions. The first function of the external transmitter / receiver 58 is to receive the data from the internal transmitter / receiver 56. In addition, the external transmitter / receiver 58 can be provided to power the transmitter / receiver without contact. internal 56 and / or the internal processing module 54. For example, the transmission of the data of the actuating nut 32 to the outside is effected by telemetry. However, other technologies or wireless protocols can be used. For example, by WIFI protocol, Zigbee, or Bluetooth. The internal transmitter / receiver 56 may be a mobile antenna 60, which is integral with the operating nut 32. This movable antenna 60 fixed on the operating nut 32 can cooperate with a fixed antenna 62 located, for example, in The movable antenna 60 is supplied without contact by the magnetic field created close by the fixed antenna 62. The mobile antenna is for example a very compact chip that can be inserted into the body of the operating nut 32. The movable antenna 60, present on the actuating nut 32, transmits to the fixed antenna 62 of the abutment box 16 the information processed by the internal processing module 54. After receiving this information, these can be transmitted to an external processing and power supply module 64, which is external to the operating nut 32. The function of the external processing and supply module 64 is to supply the transmitter / receiver external 58 and reprocess the donations the instrument (ie the force measuring device 48, the internal processing module 54 and the internal transmitter / receiver 56) provided on the operating nut 32. In addition, the processing module and external supply 64 may be able to collect data, process data and diagnose an operating state of the valve 10. The force measuring device 48 measures at any moment the force applied to the operating rod 18 The force transmitted by the screw-nut 32 is thus directly measured. An autonomous force measurement device 48 is then realized, communicating wirelessly with the outside, and which does not disturb the operation of the valve 10, whatever its state. The operating nut 32 may also include a rotation measuring device 66 for measuring the rotation of the operating nut 32. The rotational measuring device 66 may for example be a relative digital encoder.

By coupling the rotation measuring device 66 and the force measuring device 48, it is then possible to give an accurate indication of the travel of the operating rod 18 and to know the precise location where a peak of effort appears. An external processing and power supply module 64 may, for example, also process the data coming from the rotation measuring device 66. In a possible embodiment of the invention, the valve 10, and in particular the operating nut 32, communicates with a chain of acquisition of measurements so that it carries out various treatments of this measurement, in connection with a whole set of measurements carried out simultaneously on the valve 10.

The other measurements performed simultaneously on the valve 10 can be performed at the level of the thrust box, for example. In addition, the operating nut can cooperate with a bushing 68. The cooperation between the operating nut 32 and the bushing 68 may, for example, be effected by means of a key 70 (see FIG. ). The sleeve 68 may comprise an annular general section and cooperates in its hollow part with the actuating nut. For example, the operating nut 32 extends inside the bushing 68 towards its first end 40. The bushing 68 also cooperates directly with the output shaft 24 of the servomotor 22. The servomotor 22 will deliver by the rotation of its output shaft 24 a torque that will be transmitted directly to the bushing 68, then to the maneuvering nut 32. The bushing 68 serves as an interface between the actuating nut 32 and the booster 22 and allows to decouple if necessary, for example for maintenance, these two elements. More particularly, the socket 68 makes it possible to define two modes of operation, namely an operational mode and a maintenance mode.

In the operational mode, the bushing 68, coupled to the servomotor 22 and to the operating nut 32 ensures the transmission of the possible movement of the servomotor 22 to the operating nut 32 and the measurement of the torque delivered by the operating shaft 32. output 24 of the servomotor 22 during this movement. In the maintenance mode, a decoupling of the operating nut 32 from the valve 10 and the output shaft 24 of the booster 22 is provided via the bushing 68. In maintenance mode, it is that is to say during the decoupling of the actuating nut 32 and the booster 22, the shutter of the valve 10 remains in the same closed position. In this case, the actuating nut 32 is irreversible and its irreversibility prevents the rotation of the operating rod 18 following a longitudinal force on it and thus allows the shutter 20 to be held in position. In other words, the shutter 20, which is in a determined shutter position is subjected to longitudinal forces along the longitudinal axis. In operational mode, when a movement of the valve is completed, the servomotor 22 maintains a continuous force and allows a precise adjustment of the desired position of shutter. Thus a constant force is applied to the operating nut 32 which allows a precise maintenance of the position of the operating rod 18, and therefore of the shutter 20. When decoupling the actuating nut 32 and the servomotor 22 , the shutter 20 is always subjected to longitudinal forces along the longitudinal axis but, the servomotor 22 being decoupled from the actuating nut 32, no "counter-effort" exists to hold the shutter 20 in position. The longitudinal forces along the longitudinal axis applied to the shutter 20 will be transmitted to the operating rod 18. In the presence of a reversible actuating nut 32, the longitudinal force applied to the operating rod 18 implies the rotation of the operating nut 32 and the translation of the operating rod 18 in an open position of the unwanted and uncontrolled valve 10. In this case, advantageously the actuating nut 32 is irreversible and its irreversibility implies a blocking of the unwanted rotation of the actuating nut 32. The operating rod 18 can not translate and the shutter 20 remains in its initial position, insensitive to the longitudinal forces applied to it. The actuating nut 32 and the servomotor 22 are lubricated with grease and the efficiency of the servomotor 22 can change over time and in particular according to the number of operation. The bushing 68, as shown in FIG. 5, can be instrumented and provided with a torque measuring device 72 for measuring the torque that is output from the output shaft 24 of the servomotor 22 to the actuating nut. 32. The bushing may be provided with a non-contact emitter 73 of measurement data read by the torque measuring device 72 delivered by the servomotor output shaft to the actuating nut 32. The torque measuring device 72 may comprise specific instrumentation, as described above with reference to the actuating nut 32, which can allow the measurement of torque and / or effort within the coupling sleeve 68. The bushing 68 may comprise sensors regularly distributed on the outer periphery of the bushing 68. The torque measuring device 72 of the bushing 68 may be attached to the bushing 68, for example by gluing, which makes it possible to use a conventional bushing 68 of valve 10 by modifying it slightly. Thus, the rigidity of the coupling sleeve 68, and thus the rigidity of the valve 10 is little or no change compared to a conventional valve 10. If the bushing 68 is replaced with the torque measuring device 72 with a conventional bushing, the qualification for the accident conditions and in particular the seismic resistance of the valve 10 is not called into question. A temperature sensor may also be provided on the valve 10, at different locations of said valve 10. Thus, it is possible within the same valve 10, and during its operation to measure simultaneously, among others, the torque delivered by the output shaft 24 of the servomotor 22 to the operating nut 32, and / or the force transmitted by the operating nut 32 to the operating rod 18 and / or the temperature and / or the rotation of the nut. The valve 10 may for example be an element of an electrical valve system 75 of a nuclear power plant 76. The nuclear power plant 76, as shown in FIG. 7, comprises a primary circuit 78, a secondary circuit 80 and a tower The valve 10 is for example provided at the secondary circuit 80 of the nuclear power plant 76. In a possible embodiment of the invention, a processor 74 may be provided for executing a computer program product implementing data collection operations provided by a processing module and from the force measuring device 48 (and possibly also from the torque measuring device 72) of the valve 10 as well as processing of said data to diagnose a state of operation of the valve 10. The data is then provided by the external processing module 64 located outside the operating nut 32. The processor 74 will be able, from the value of the force transmitted to the operating rod 18, to diagnose an operating state of the valve 10, for example the behavior of the operating nut 32. According to the values obtained, the processor 74 will be able, from other functional parameters of the valve 10, to determine whether intervention should take place on the servomotor 22 only, or if the entire valve 10 is to be stopped. In an alternative embodiment, the processor 74 can execute a computer program product implementing data collection operations provided by the processing module 64 and issued solely from the force measuring device 48 associated with the operating nut 32. or from the force measuring device 48 associated with the operating nut 32 and the torque measuring device 72 associated with the bushing 68. FIG. 6 more particularly represents a flowchart of an exemplary method capable of being implemented by a computer program product when it is executed by a processor 74. The cell S10 of the flowchart 20 represents the measurement of the force on the operating rod 18 via the force measuring device of the actuating nut 32. The measurement, and more particularly the value of the measurement performed, is collected (step S10) and then checked (step S11) to ensure that it is not aberrant and that there was no error in the transmission of data. For example, a measurement of zero force, while the valve 10 is in operation may be considered aberrant. Once the measurement is verified (cell S11) and correct (state OK), there may be a step of comparison of the value of the force measured by the measuring device and the value of the theoretical or expected effort (cell S12). If the value of the expected or theoretical force and the value of the measured force are substantially equal (OK state), then the system will be able to diagnose a state of operation of the correct valve, for example a behavior of the correct operating nut 32 (cell S13). In the opposite case, if the value of the theoretical or expected effort (cell S15) and of the measured effort are substantially different (KO state), other tests may be necessary to ensure the state of exact operation of the valve 10 from the measurement made by the force measuring device present on the actuating nut 32 (cell S14). These tests may take into account the measurements made of temperature or torque and will then allow the diagnosis of a defective state of the valve, for example a faulty operation of the actuating nut 32 (cell S16) or otherwise a correct operating state (cell S17).

Claims (15)

REVENDICATIONS1. Valve (10) comprising: an operating rod (18) adapted to actuate a valve shutter (20), a servomotor (22) having an output shaft (24) adapted to control the operating rod (18), an actuating nut (32) forming an interface between the servomotor (22) and the actuating rod (18) for transforming a rotational movement of the output shaft (24) of the servomotor (22) into a translational movement of the operating rod (18), characterized in that said operating nut (32) comprises: a force measuring device (48) for measuring the force applied to the operating rod (18) by the operating nut (32), a transmitter (56) without measurement data contact recorded by the force measuring device (48). 2. Valve (10) according to claim 1, wherein the force measuring device (48) comprises a force sensor provided with sensitive elements (50) located on the actuating nut (32). 2 0 The valve (10) of claim 2, wherein the actuating nut (32) has machined areas (52), and the sensing elements (50) are arranged in the machined areas (52). Valve (10) according to claim 2 or 3, wherein the actuating nut (32) comprises a sleeve (34), within which the operating rod (18) extends, the actuating nut (32) has a first end (40), a second end (42) and an annular flange (44) arranged between the first and the second end (40, 42), and wherein the sleeve (34) comprises in addition, a machined area (52) between the annular flange (44) and the second end (42), a sensing element (50) being arranged in said machined area (52) between the annular flange (44) and the second end (42). 5. Valve (10) according to claim 4, wherein the sensitive elements (50) are strain gauges. The valve (10) according to any one of claims 1 to 5, wherein an internal processing module (54) installed on the actuating nut (32) processes the data from the force measuring device (48). ) before directing them to the contactless emitter (56). 7. Valve (10) according to any one of claims 1 to 6, wherein a system external to the actuating nut (32) feeds without contact the force measuring device (48) and receives the measurement data transmitted by the transmitter (56) without contact. 8. Valve (10) according to any one of claims 1 to 7, wherein an external processing module (64) to the actuating nut (32) processes the data from the measuring device. 9. Valve (10) according to any one of claims 1 to 8, further comprising a coupling sleeve (68) connected to the servomotor (22) and the actuating nut (32) for coupling in rotation the output shaft (24) of the servomotor (22) and the actuating nut (32). The valve (10) of claim 9, wherein the coupling bushing (68) comprises: a torque measuring device (72) for measuring the torque delivered by the servomotor output shaft (24). (22) to the actuating nut (32), and a non-contact transmitter of measurement data read by the torque measuring device (68). 11. Maneuvering nut transforming a rotational movement of the output shaft (24) of a servomotor (22) in a translational movement of an operating rod (18) of a valve (10) according to the invention. one of the preceding claims, comprising: a force measuring device (48) for measuring the force applied to the operating rod (18) by the actuating nut (32), a transmitter (56) without measuring data contact detected by the force measuring device (48). An electrical valve system (75) of a nuclear power plant (76) comprising a valve (10) according to any one of claims 1 to 10. 13. Processing module (54, 64) of a valve (10) according to claim 8 for implementing the processing of the data from the effort measuring device (48) comprising data collection means, data processing means and means for diagnosing a state of operation of the valve (10). 14. Method of implementation by the processing module (54, 64) according to claim 13 of the measured data comprising the following steps: - associating a receiver at the operating nut (32) adapted to collect the data of the force measuring device (48) of the valve (10) according to any one of claims 1 to 10, - collecting the data of the force measuring device (48) of the valve (10), - treating the collected data, - diagnose an operating state of the valve (10). 15. Computer program product comprising instructions for implementing the method according to claim 14, during an execution of this program by a processor (74).