Portable terminal for testing or adjusting a pneumatically operated valve

Abstract

A portable terminal (1) for testing or adjusting a pneumatically operated valve (R, R'), the portable terminal (1) comprising a housing (2) containing: a control device configured to output a control signal to open or close the valve; a pressure sensor configured to measure the pressure induced at the valve by the control signal at a given time; and a position sensor (30, 32) configured to measure the position at a given time of a moving element of a valve actuator that moves during the opening or closing of the valve. Figure for the abbreviation: Fig. 3

Description

Title of the invention: Portable terminal for testing or adjusting a pneumatically operated valve FIELD OF THE INVENTION

[0001] The present invention relates to a portable terminal for testing or adjusting a pneumatically operated valve. STATE OF THE ART

[0002] There are different types of pneumatically operated valves: linear gate control valves, rotary gate control valves, linear gate isolation valves, rotary gate isolation valves. In addition, the actuators of these valves vary: on / off type, with or without an analog positioner, with or without an electro-pneumatic converter, etc.

[0003] To test or adjust a pneumatically operated valve, a technician or operator conventionally uses a multitude of devices, most often repurposed from their original function (for example, a pressure regulator (pneumatic pressure reducer), a mechanic's ruler (which is imprecise, unreliable, and prone to damage), while others are too complex to operate (specialist tools such as current or pressure generators) for which only 5% of their capacity is used. Most of these devices are imprecise and allow only approximate valve adjustment. Furthermore, these tools are numerous because each unit requirement, each measurement, necessitates the use of a separate tool, which implies knowledge of its specific operation and origin (French or Anglo-Saxon for converting units of measurement, etc.).), their maintenance in specific conditions, and how to transport them to the intervention areas.

[0004] For example, it is customary to proceed as follows: • A control signal is generated using an autonomous generator (electric or pneumatic). • Pressure is measured using a pressure gauge (needle or digital). • A linear stroke is measured using a ruler, or an angular stroke, at with the help of a mechanical protractor • A driving pressure is generated with a self-contained pneumatic regulator.

[0005] It is realized that, depending on the type of valve and the type of parameters to be generated or measured, this requires many different tools. This greatly complicates the organization of the activity, as as many connection accessories are needed as there are types of equipment. Furthermore, this requires the provision of all calibration reports for the equipment used for the adjustment. Furthermore, the compatibility of all these resources is highly variable, making implementation tedious (requiring numerous trips to retrieve the various equipment without any guarantee of its proper functioning). Description of the invention

[0006] One object of the invention is to remedy the situation described above, by enabling a user to test or adjust a pneumatically operated valve in a simpler, more precise and faster manner.

[0007] This objective is achieved by a portable terminal for testing or adjusting a pneumatically operated valve, the portable terminal comprising a housing containing: • a control device configured to emit a control signal to open or close the tap; • a pressure sensor configured to measure pressure induced towards the tap by the control signal at a given instant; and • a position sensor configured to measure the position at a given moment of a moving element of a tap actuator that moves during the opening or closing of the tap.

[0008] The portable terminal may also include the following optional features, taken alone or combined with each other whenever technically possible.

[0009] Optionally, the control device includes an electrical output port to deliver a control current to an electropneumatic converter of the valve.

[0010] Optionally, the control device includes a dimmer to vary the intensity of the control current within a predefined range, for example the range from 4 milliamperes to 20 milliamperes.

[0011] Optionally, the control device includes a pressure port to deliver control pressure to the tap actuator.

[0012] Optionally, the handheld terminal includes a switch to configure the pressure port: • in a control mode, in which the pressure port delivers the control pressure, and • in a measurement mode, in which the pressure port communicates the induced pressure to the pressure sensor.

[0013] Optionally, the control device further includes a pressure regulator configured to set the control pressure to different values ​​contained within a predefined pressure range.

[0014] Optionally, the control device includes a pressure inlet for receiving input pressure from a pressure source external to the handheld terminal, and in which the pressure regulator is configured to generate the control pressure to the actuator from the input pressure.

[0015] Optionally, the control device includes a second pressure port to deliver a second control pressure to a valve positioner.

[0016] Optionally, the portable terminal further includes: • a second pressure sensor configured to measure a second pressure induced in the actuator by the control signal at the given instant, • a second switch to configure the second pressure port: • in a control mode in which the second pressure port delivers the control pressure to the positioner, • in a measurement mode, in which the second pressure port communicates the second induced pressure to the second pressure sensor.

[0017] Optionally, the regulator is configured to vary the control pressure within the predefined pressure range according to a first step, the pressure range has a first upper bound.

[0018] Optionally, the control device further includes a second pressure regulator configured to set the second control pressure to different values ​​contained within a second predefined pressure range, and to vary the second pressure within the second predefined pressure range in a second step, the second pressure range has a second upper limit.

[0019] Optionally, the second step is different from the first step, for example less than the second step and / or the second upper bound is different from the first upper bound, for example less than the first upper bound.

[0020] Optionally, the handheld terminal includes a display screen configured to display pressure and position.

[0021] Optionally, the case includes: • a base defining a lower compartment in which the control device, pressure sensor and position sensor are stored, • a lid delimiting an upper compartment in which the display screen is stored, the lid being movable in rotation relative to the base between • a closed position in which the casing is closed and the screen display is hidden by the user, • an open position in which the control device, the

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031] The pressure sensor and the position sensor are accessible by a user, and in which the display screen is visible to the user. Optionally, the handheld terminal also includes a force input port configured to receive a force measured by a strain gauge attached to the valve stem. Optionally, the handheld terminal includes a memory configured to store pressure and position in association with the given time. A kit is also available that includes: • the portable terminal as defined above, and • a computer program comprising program code instructions for displaying time curves including pressure and position on a computer screen, when this program is executed by the computer. A method for testing or adjusting a pneumatically operated valve using the portable terminal described above is also proposed; the method includes the following steps: • emission, by the control device, of a control signal to open or close the tap, • measurement, by the pressure sensor, of the pressure induced in the tap by the control signal at a given instant, • measurement, by the position sensor, of the position of a moving element at a given moment of a tap actuator which moves during the opening or closing of the tap. DESCRIPTION OF THE FIGURES Other features, purposes and advantages of the invention will become apparent from the following description, which is purely illustrative and not limiting, and which should be read in conjunction with the accompanying drawings on which: Fig. 1 is a side view of a pneumatically operated linear gate valve according to a first embodiment. Figure [Fig. 2] is a perspective view of a pneumatically operated rotary shutter valve according to a first embodiment. Fig. 3 is a perspective view of a portable terminal for testing or adjusting a pneumatically operated valve, according to one embodiment. [Fig.4] is a front view of a lower part of the handheld terminal shown in [Fig.3]. Figure 5 is a front view of the upper part of the portable terminal shown. on the [Fig.3].

[0032] [Fig.6] illustrates a graphical interface displayed by a display screen of the portable terminal shown in [Fig.3], according to one embodiment.

[0033] Figure 7 details a lower part of the graphical interface of Figure 6.

[0034] Fig. 8 represents a graphical interface of a computer program according to one embodiment, while the graphical interface renders a table of measured data.

[0035] Figure 9 represents the graphical interface of Figure 8, while the interface The graph displays a time curve of effort.

[0036] The [Fig. 10] represents the graphical interface of the [Fig.8] while the graphical interface renders a linear displacement time curve.

[0037] Fig. 11 represents the graphical interface of Fig. 8, while the graphical interface renders a time-domain pressure curve in the actuator.

[0038] The [Fig. 12] represents the graphical interface of the [Fig.8] while the graphical interface renders another time curve of instrumentation pressure.

[0039] The [Fig. 13] represents the graphical interface of the [Fig.8] while the graphical interface renders a curve representing the evolution of a stroke as a function of a pressure in the actuator.

[0040] Throughout the figures, similar elements bear identical references. DETAILED DESCRIPTION OF THE INVENTION 1 / Pneumatically operated valves

[0041] With reference to [Fig. 1], a pneumatically operated valve according to a first embodiment comprises two parts: a valve body C, and an actuator A.

[0042] The valve body C delimits a passage for a fluid (liquid or gas), and includes a shutter capable of being closed so as to obstruct the passage, and of being opened so as to allow the flow of a fluid into the passage.

[0043] The actuator includes a movable element relative to the tap body.

[0044] The moving element takes the form of a T-shaped rod extending along an axis, which is connected to the valve to open or close it. In this embodiment, the moving element is translationally movable, so that the obturator is moved translationally by this moving element. The valve is then said to have a "linear obturator".

[0045] The actuator A is a pneumatic actuator. This means that it is compressed air that causes a movement of the moving element, and ultimately of the shutter.

[0046] The valve also includes a sealing gasket J to ensure a seal between the moving element and the valve body. The sealing gasket is, for example, a packing gland.

[0047] When the valve is a shut-off valve (also called a shut-off valve "all or nothing"), actuator A is configured to position the shutter in only two positions: the open position and the closed position.

[0048] When the valve is a regulating valve, the actuator A can not only position the obturator in the two aforementioned positions, but also in a multitude of intermediate positions in which the obturator only partially obstructs the passage delimited by the valve body. Thus, the opening level of the passage can be selected using the actuator A, thereby regulating the flow rate of liquid passing through this passage.

[0049] The actuator A includes a stroke indicator. The stroke indicator comprises a protruding element II mounted on the rod T, and a scale 12 opposite the element II. In the embodiment shown in the figure, the protruding element is in the form of a washer. The relative positioning of the protruding element II with respect to the scale 12 allows a user to visually assess the position of the moving rod and, by extension, the valve's obturator.

[0050] The valve R may include an electropneumatic converter upstream of the actuator (not shown). Such a converter generates a pressure proportional to an electrical control current that the converter receives at its input.

[0051] The valve may also include a positioner between the electropneumatic converter and the actuator. The positioner receives the pressure generated by the electropneumatic converter and moves the movable stem T by adapting the pressure in the actuator A to the control pressure sent by the electropneumatic converter and the position of the stem T.

[0052] In conclusion, the valve R can be controlled directly with a pressure control signal, in which case this control signal directly induces a movement of the movable rod T of the actuator A, or it can be controlled with an electrical control current passed into the input of the electropneumatic converter.

[0053] Typically, the valve R includes a return element that forces the movable stem T into a safe position when no control signal is supplied to the valve R. For example, the safe position may be the stem position that closes the valve. In this case, receiving a control signal moves the actuator A to the open position, and as soon as the control signal ceases, the actuator returns to its safe position.

[0054] Figure 2 shows a pneumatically operated valve R' according to a second embodiment. This valve comprises the same elements as those mentioned above, and particularly an actuator comprising a movable element relative to the valve body. However, unlike valve R, the movable element of valve R' is rotatable relative to the valve body. This is referred to as a rotary valve.

[0055] 2 / Portable terminal 1 for testing / adjusting a pneumatically operated valve

[0056] With reference to [Fig.3], a portable terminal 1 for testing or adjusting either of the pneumatically operated valves described above comprises a housing 2.

[0057] The housing 2 includes a base 4, a cover 6, and a hinge system 8 connecting the cover 6 to the base 4.

[0058] Base 4 delimits a lower compartment for storing various equipment which will be described later.

[0059] The cover 6 delimits an upper compartment for storing other equipment, which will also be described later.

[0060] The cover 6 is mounted to rotate freely on the base 4, thanks to the hinge system 8. Thus, the cover 6 is mobile in rotation between an open position and a closed position.

[0061] When the cover 6 is in the closed position, the case 2 is sealed, so that a user cannot see the equipment stored inside. This equipment is therefore captive. When the cover 6 is in the open position, the user has access to and can see this equipment.

[0062] The case 2 includes a handle 10, allowing a user to carry the handheld terminal 1 when the case 2 is closed, in the manner of a briefcase.

[0063] The housing 2 includes a locking system for locking the housing in the closed position. The locking system is, for example, of the pressure type and may include two tabs mounted on the lid, designed to engage with the base.

[0064] The volume of the portable terminal 1 can be on the order of 45 liters. The dimensions of the case 2 in the closed position are, for example, 558 mm x 340 mm x 228 mm.

[0065] We will now detail the components of the portable terminal 1 which are stored in the case 2.

[0066] The portable terminal 1 includes a control device configured to emit a control signal to open or close one of the aforementioned pneumatically operated valves. It will be seen later that the control device can emit various types of control signals.

[0067] The control device is stored in the lower compartment.

[0068] The control device includes a first pressure control unit.

[0069] The first pressure control unit includes a first pressure port 14 for delivering a first control pressure to one of the aforementioned pneumatically operated valves. The first control pressure constitutes a first type of control signal emitted by the handheld terminal 1. The first pressure port 14 is adapted to be fluidly connected to the actuator of a valve via a pneumatic connection hose provided for this purpose. As will be seen later, the first The pressure delivered by the first pressure port 14 is intended to cause the movable stem T and the valve obturator R to move open or close. For example, when the safety position of valve R is its closed position, the control pressure delivered moves the actuator open.

[0070] The first pressure control unit further includes a first pressure regulator 16 configured to adjust the first control pressure delivered via the first pressure port 14 to different values ​​contained within a first range of predefined pressures.

[0071] The first pressure range goes from zero to a maximum value constituting an upper bound of the first pressure range, called the first upper bound.

[0072] The first regulator 16 can be discretely adjustable, that is to say, it only allows the pressure to be adjusted to values ​​separated by a constant step in the first predefined pressure range.

[0073] The first regulator 16 includes, for example, a wheel that is movable and rotates relative to the housing 2, the angular position of the wheel determining the pressure delivered by the first pressure port 14. By turning the wheel in one direction, a user can increment the first pressure delivered by the first pressure port 14 by an increment equal to the first step, and by turning the first wheel in the opposite direction, the user can decrement the first pressure delivered by the first pressure port 14 by the same increment (equal to the first step).

[0074] The first pressure control unit also includes a first pressure inlet suitable for being fluidly connected to a pressure source external to the portable terminal 1.

[0075] The first pressure inlet is preferably formed at the end of a flexible hose, which can be partially extracted from the housing 2 to facilitate its connection to the external pressure source, and which can be compressed or wound so as to remain confined within the housing 2.

[0076] The first pressure regulator 16 is adapted to generate the first control pressure delivered by the first pressure port 14 from an incoming pressure supplied by this external pressure source via the first pressure inlet. It can thus be seen that the first pressure regulator 16 acts as a regulator, since it sets the value of the first pressure to be delivered to the first pressure port 14 (according to the position of the first knob), this value being, in principle, different from the incoming pressure supplied by the external pressure source.

[0077] The control device further includes a second pressure control unit.

[0078] The second pressure control unit includes a second pressure outlet port 20 for delivering a second control pressure to a valve at Pneumatic control comprising a positioner without an electro-pneumatic converter. The second pressure port 20 is adapted to be fluidly connected to the valve positioner via a pneumatic connection cable 18 provided for this purpose. Just like the first control pressure delivered by the first pressure port 14, the second control pressure delivered by the second pressure port 20 is intended to cause the stem T and the valve disc R to move open or closed, by means of the positioner arranged upstream of the actuator. For example, when the valve is in its closed safety position, the delivered control pressure is communicated to the positioner, which moves the actuator open.

[0079] The second pressure control unit also includes a second regulator 22 to vary the pressure delivered via the pressure port in a second predefined pressure range.

[0080] The second range goes from zero to a maximum value constituting an upper bound of the second range, called the second upper bound.

[0081] The second regulator 22 can be discretely adjustable, that is to say, it can only allow the pressure to be adjusted to values ​​separated by a constant step in the second range of predefined pressures.

[0082] The second regulator 22 includes, for example, a second rotating movable knob, the angular position of the second knob determining the second control pressure delivered by the second pressure port 20. By turning the second knob in one direction, a user can increment the second pressure delivered by the second pressure port 20 by an increment equal to the second step, and by turning the second knob in the opposite direction, the user can decrement the second control pressure delivered by the second pressure port 20 by the same increment (equal to the second step).

[0083] The second pressure control unit also includes a pressure inlet suitable for being fluidly connected to a pressure source external to the terminal.

[0084] The second pressure inlet and the first pressure inlet are in fact one and the same inlet. In this way, the first pressure can be delivered to the first pressure port 14 and the second pressure to the second pressure port 20 based on an inlet pressure received via a single pressure inlet.

[0085] The second regulator 22 generates the pressure delivered by the pressure port from an incoming pressure supplied by this external pressure source via the second pressure inlet. Like the first regulator 16, the second regulator 22 acts as a regulator, since it sets the value of the second pressure to be delivered to the second pressure port 20 (depending on the position of the second knob). being thus in principle different from the pressure received at the inlet and supplied by the external pressure source.

[0086] Furthermore, the second wheel and the first wheel can be identical.

[0087] However, the first regulator 16 and the second regulator 22 preferably have different properties.

[0088] First, the second step may be different from the first step. For example, the second step may be shorter than the first.

[0089] Secondly, the second upper terminal may be different from the first upper terminal. For example, the second upper terminal may be lower than the first upper terminal. This allows the terminal to be compatible with a wider variety of taps, requiring varying pressures to be fully opened, for example.

[0090] In one embodiment, the first pressure range goes from 0 to 8 bars, while the second pressure range goes from 0 to 2 bars.

[0091] In a particular embodiment, the first and second dials can be positioned in the same number of angular positions, thus allowing the same number of pressure settings to be applied. Therefore, with two identical dials, the user can traverse a narrow range and a wider range with the same number of positions (but different increments). For example, suppose that the number of possible positions for the first and second dials is 10. In this case, the first increment could be 0.2 bar, and the second increment could be 0.8 bar.Ultimately, the user has a pressure control unit that allows for fine scanning of a narrow pressure range (the second pressure control unit), and also has a pressure control unit that allows for less fine but faster scanning of a wider pressure range (the first pressure control unit).

[0092] The control device also includes an electrical control unit.

[0093] The electrical control unit includes an electric current generator 24.

[0094] The electric current generator 24 includes a battery, so that the portable terminal 1 is electrically self-contained, meaning that there is no need to connect the terminal to a mains socket.

[0095] It should be noted in passing that the battery can also be used to power the other components present in the portable terminal 1.

[0096] The electrical control unit further includes an electrical output port 26 for delivering a control electrical current generated by the electrical current generator 24. The control electrical current constitutes a second type of control signal emitted by the handheld terminal 1 (in addition to the control signals (in pressure discussed previously). The electrical control current can be transmitted to the electro-pneumatic converter (via a cable provided for this purpose stored in pouch 52) as described previously, via an electrical connection cable connected on one side to the electrical output port 26 and on the other side to the electro-pneumatic converter of the industrial installation. The control current delivered by the electrical port is intended to cause the valve of tap R to open or close.

[0097] Generally, in a regulating valve, the opening level of the obturator is a function of the intensity of the control current. Therefore, the control device advantageously includes a dimmer 28 to vary the intensity of the control current within a predefined range.

[0098] In the illustrated embodiment, the dimmer 28 takes the form of a dial capable of rotating in a first direction to increase the current intensity, and in a second direction opposite to the first direction to reduce the current intensity. However, the dimmer could take other forms in other embodiments.

[0099] For example, the predefined range goes from 0 milliamperes to 24 milliamperes.

[0100] Just like the expansion valves described above, the variator 28 uses a current step to vary the intensity of the control current to be delivered in a discrete manner.

[0101] The current control unit also includes a means for adjusting the current step to different values, in particular 1 / 1000 of a milliampere, 1 / 100 of a milliampere, or 1 / 10 of a milliampere. In other words, by turning the knob one click, the control current intensity can be varied by 0.001 mA, 0.01 mA, or 0.1 mA, depending on the current step selected using the current step adjustment means. The current step adjustment means is a button in the illustrated embodiment.

[0102] The current control unit also includes a mode switch for configuring the current generator in the following modes: • A "constant value" mode, in which the control current intensity is fixed by the drive, • A “dynamic ramp” mode, in which the current generator automatically generates a current ramp, for example an upward ramp followed by a downward ramp.

[0103] The mode switch is, for example, another key that causes a mode change each time it is pressed

[0104] The duration of the ramps is also adjustable, for example via the dial while the control unit is in dynamic ramp mode.

[0105] The handheld terminal 1 also includes several sensors, which will be listed below.

[0106] The handheld terminal 1 includes at least one position sensor 30 and 32 configured to measure a position, at a given instant, of the moving element T of a tap actuator which moves during the opening or closing of the tap, for example the tap R or R'.

[0107] Each position sensor 30 or 32 is a removable element, stored in the lower compartment of the housing. To measure the position of the moving element of a tap, the position sensor is to be positioned on the tap.

[0108] The handheld terminal may include foam supports arranged in the base, so as to receive and secure the position sensors 30, 32.

[0109] The portable terminal 1 also includes an input port in position 34, fixed relative to the housing 2.

[0110] The input port in position 34 is adapted to be able to be connected to the position sensor 30 or 32 via data transmission cable, so that a position measurement made by the position sensor 30 or 32 can be received by the input port in position 34.

[0111] Terminal 1 comprises two different position sensors: • a linear position sensor 30, suitable for measuring the position of the moving element of the linear shutter valve actuator, and • an angular position sensor 32, suitable for measuring the angular position of the moving element of the rotary shutter valve.

[0112] For example, the linear position sensor 30 is of the cable type.

[0113] Furthermore, the angular position sensor 32 can be of the inductive type.

[0114] Either of the two position sensors 30 or 32 can be connected to the input port in position 34 via a suitable cord.

[0115] The portable terminal 1 further includes a first pressure sensor configured to measure a first pressure induced at a valve by a control signal emitted by the control device. In particular, the first measured pressure can be induced by the second pressure delivered via the second pressure port 20, or indirectly by the current delivered via the electrical output port 26 and subsequently processed by the electropneumatic converter discussed previously.

[0116] The portable terminal 1 also includes a first switch 36 which allows the first pressure port 14 to be configured in two different operating modes: a control mode and a measurement mode.

[0117] In the control mode, the first pressure port 14 delivers the first control pressure discussed previously, the value of this first pressure being set via the first regulator 16.

[0118] In the measurement mode, the first pressure port 14 is in fluidic communication with the first pressure sensor, so that a pressure from a valve and passing through the first pressure port 14 can be measured by the first pressure sensor. In this measurement mode, the first pressure regulator 16 is no longer in fluidic communication with the first pressure port 14.

[0119] In the illustrated embodiment, the first switch 36 includes a tap that rotates a quarter turn to switch from control mode to measurement mode or vice versa.

[0120] The portable terminal 1 further includes a second pressure sensor configured to measure a second pressure induced at a valve by a control signal emitted by the control device. In particular, the second measured pressure can be induced by the first pressure delivered via the first pressure port 14, or indirectly by the current delivered via the electrical output port 26 and subsequently processed by the electropneumatic converter discussed previously.

[0121] The portable terminal 1 also includes a second switch 38 which allows the second pressure port 20 to be configured in two different operating modes: a control mode and a measurement mode.

[0122] In the control mode, the second pressure port 20 delivers the second control pressure discussed previously, the value of this second pressure being set via the second regulator 22.

[0123] In the measurement mode, the second pressure port 20 is in fluidic communication with the second pressure sensor, so that a pressure from a valve and passing through the second pressure port 20 can be measured by the second pressure sensor. In this measurement mode, the second pressure regulator 22 is no longer in fluidic communication with the second pressure port 20.

[0124] In the illustrated embodiment, the second switch 38 includes a tap that rotates a quarter turn to switch from control mode to measurement mode or vice versa, just like the first switch 36.

[0125] The handheld terminal 1 also includes a force input port 40, which can be connected to a strain gauge attached to the moving stem of a valve, via a data transmission cable (stored in pouch 52). Thus, the handheld terminal 1 can obtain a force measurement provided by such a strain gauge.

[0126] The portable terminal 1 also includes a processor and memory.

[0127] The memory is adapted to store the measurements provided by the aforementioned sensors Previously. Memory can be of any type.

[0128] The processor is configured to control the storage of measurements provided by the sensors mentioned above. In particular, the processor is configured to timestamp the measurements, so as to store them in association with a specific time. corresponding measurement.

[0129] The processor is also configured to perform calculations, in particular unit conversion calculations for measurements provided by the sensors. Specifically, the processor is configured to convert a pressure in bars, measured by the first pressure sensor or by the second pressure sensor, into a pressure in Psi (pound-force per square inch). It should be noted that 1 Psi = 6.89476 kPa (kilopascal).

[0130] Thus, with the proposed portable terminal 1, it is possible to store several measurements from different sensors taken simultaneously (for example, a position measurement, a pressure measurement, and a force measurement). With the disparate equipment discussed in the introduction to this application, it is difficult to achieve the same level of precision.

[0131] This stored data can then be displayed in the form of a graph.

[0132] The mobile terminal also includes a USB port, to allow the export of data stored in memory to another device.

[0133] The stored data can serve as a basis for friction and force calculations to be even more precise on the settings of the taps.

[0134] The terminal also includes an on / off switch 42, that is to say a switch enabling the components of the portable terminal 1 to be switched on and off.

[0135] The on / off switch 42 may include an integrated indicator light which illuminates when the terminal is powered on.

[0136] The portable terminal 1 also includes a battery charge indicator 44.

[0137] The portable terminal 1 further comprises a panel 46 extending into the com lower compartment.

[0138] Arranged on panel 46: • The first pressure port 14, • The first dial 16, • The first switch 36, • The second pressure port 20, • The second dial 22, • The second switch 38, • The electrical output port 26, • The 40-force entry port, • The input port in position 34, • The on / off switch 42, • The battery charge indicator 44, • The current regulator.

[0139] The processor, memory, and pressure sensors are arranged under panel 46.

[0140] The panel 46 does not cover the entire lower compartment of the handheld terminal 1, so as to leave storage space available in the lower compartment for storing accessories. These accessories are as follows: • The linear position sensor 30, • The angular position sensor 32, • A set of pneumatic fittings of different sizes 48, • An articulated arm 50 that can help to fix the position sensors 30 or 32. • A spiral pneumatic hose 18 for connecting ports 14 or 20 to tap or its accessories.

[0141] With reference to [Fig. 5], the portable terminal 1 also includes a storage net 52 which, together with the lid, delimits a storage space for connection accessories 48 for connecting the housing to a tap. These connection accessories may include: • a Staubli® RBE 03 male to 1 / 8” male thread adapter, • a Staubli® RBE 03 male to 1 / 4” male thread adapter, • a Staubli® RBE 03 male to 3 / 8” male thread adapter, • a Staubli® RBE 03 male to 1 / 2” male thread adapter, • a Staubli® RBE 03 male / male adapter, • a Schrader® to Staubli® RBE 03 male adapter, • a suitable electrical connection cord to be connected to the electrical output port 26, • a position copying rod.

[0142] The portable terminal also includes a 54 display screen.

[0143] The display screen 54 is arranged in the upper compartment.

[0144] The display screen 54 is preferably a touch screen (to avoid the use (of a mouse or additional external device) which allows visualization and interaction directly and in real time with information from sensors and the processing of their data so that non-expert users can use and understand them without necessarily being experts in the field.

[0145] A transmission cord 56 connects the display screen 54 to the processor and the battery, so that the processor can transmit data to the display screen 54 to be displayed.

[0146] Figure 6 shows a graphical interface displayed on the display screen 54 on command from the processor.

[0147] The graphical interface comprises three areas: • a first zone 60, known as the "pressure zone", • a second zone 62, known as the “movement zone”, • a third zone 64, known as the effort zone”.

[0148] The pressure zone is located in the upper part of the display screen 54. The pressure zone features: • the pressure in bars measured by the first pressure sensor, • the pressure in Psi resulting from the conversion performed by the processor on the base 4 of the preceding pressure in bars, • the pressure in bars measured by the second pressure sensor, • the pressure in Psi resulting from the conversion performed by the processor on the base 4 of the preceding pressure in bars,

[0149] Displaying these pressures not only in bars but also in Psi simplifies the work of a user who has to test / adjust a tap (indeed, some working documents are written in English and the pressures are then indicated in Psi, which is an Anglo-Saxon unit of measurement).

[0150] The "displacement zone" is located in the middle of the display screen 54. The "displacement zone" shows the position measured by the position sensor connected to the input port in position 34.

[0151] We have seen previously that the handheld terminal 1 includes two different position sensors: a linear position sensor 30, and an angular position sensor 32. The position measured by the linear sensor 30 is a length (for example expressed in millimeters), and the position measured by the angular sensor 32 is an angle (for example expressed in degrees).

[0152] The second zone 62 includes a unit change button, allowing the unit to be changed to be displayed according to the type of sensor connected.

[0153] The force area includes a window for displaying curves showing the evolution of a force measured by a strain gauge connected to the force input port 40. To display a curve, the processor receives a sequence of force values ​​associated with different measurement times. The displayed curves unambiguously show the direction of deformation of the tap stem to a user.

[0154] The window covers, for example, a time interval of 30 seconds in one embodiment.

[0155] The effort zone 64 also includes several touch buttons.

[0156] The red button marked with a "T" allows you to draw a horizontal curve which This indicates the resistance of the packing gland when opening the tap. The horizontal curve thus drawn represents the level of friction of the packing gland during opening.

[0157] The blue button marked with a "C" allows a horizontal line to be drawn, indicating the resistance of the packing gland when closing the tap. The curve ho The radial curve thus drawn represents the level of friction of the press gasket during closing.

[0158] In each of the three areas mentioned above, a "RESET" button allows the data displayed in the corresponding area to be reset to zero.

[0159] 3 / Method for testing / adjusting a pneumatically operated valve

[0160] We will now describe the possible uses of the portable terminal 1 for testing / adjusting a pneumatically operated valve of any of the types described above.

[0161] Simulate an instrumentation signal (between 3 and 15 Psi)

[0162] When the valve to be adjusted is controlled by a pneumatic level sensor, it is useful to be able to generate a 3-15 Psi signal at will. The steps a user of handheld terminal 1 can follow are as follows: • Install a 48 fitting on the tap positioner in question, from among the fittings stored in case 2 of the portable terminal. • Connect the second pressure port 20 to the fitting using the pneumatic hose stored in case 2. • Ensure that the second switch 38 is in the position that configures the second pressure port 20 in control mode. • Vary the pressure delivered by the second pressure port 20, by manipulating the knob of the regulator 22. Powering an actuator

[0163] The handheld terminal 1 allows the pressure in the actuator of a pneumatically operated valve to be adjusted for several purposes: setting the pressure, checking the starting point, checking or adjusting the stroke, etc. An example of steps that a user of the handheld terminal 1 can perform for this purpose is as follows: • Install a fitting (48) on the actuator using the fittings stored in case 2 (for example a Staubli® male fitting RBE 03). • Connect one of the pressure ports to the actuator via the pneumatic hose stored in housing 2, for example the first pressure port 14, • Turn the first regulator 16 to the minimum to avoid overpressure. • Supply the first control unit with air by connecting the pressure inlet to an external air source (for example via a Staubli® RBE011 fitting in one embodiment). • Ensure that the first switch 36 is in the position that configures the first pressure port 14 in control mode. • Vary the pressure delivered by the first port, by manipulating the knob of the first regulator 16. Pressure reading

[0164] As previously stated, the first switch 36 or the second switch 38 must be positioned in measurement mode, in order to measure pressure using the first pressure sensor via the first pressure port 14, or to measure pressure using the second pressure sensor via the second pressure port 20. Installation of the linear position sensor 30

[0165] The handheld terminal 1 allows for precise measurement of the linear stroke of the valve. This measurement is performed via the linear position sensor 30 stored in the lower compartment of the housing 2. On regulating valves, the linear position sensor 30 can be attached to the position feedback rod. On on / off valves, a measuring spoon can be added. The measuring spoon is supplied with the case.

[0166] The steps to install the linear position sensor 30 may be as follows: • Fix the linear position sensor 30 onto the articulated arm. • Attach the articulated arm to a rigid and fixed part of the tap. • Attach the sensor wire to the copying rod or to a spoon (in the case of on / off taps). • Connect the position sensor to the input port in position 34. • Select the millimeter display mode by pressing the button that sets the unit of measurement in the displacement area. • Reset the "displacement" area by pressing the RESET button for this area displayed on the display screen 54.

[0167] The race readout is ready for use. Installation of the angular position sensor 32

[0168] The handheld terminal 1 also allows for precise measurement of the angular stroke of the tap. The steps for installing the angular position sensor 32 may be as follows: • Attach the angular displacement sensor to the articulated arm. • Attach the articulated arm to a rigid and fixed part of the tap. • Attach the angular position sensor 32 to the tap shaft (this attachment can, for example, be achieved using a magnet on the sensor). • Connect the position sensor to the input port in position 34. • Select the degree display mode by pressing the button that adjusts the unit of measurement in the displacement area, • Reset the "displacement" area by pressing the RESET button for this area displayed on the display screen 54.

[0169] The angular stroke reading is ready for use. Displaying effort

[0170] The force zone 64 of the graphical interface displayed on the display screen 54 allows the forces received by a strain gauge to be represented. The strain gauge to be used may be of the full-bridge type. This type of gauge consists of a single resistor; its installation is therefore simpler. It is important to note that the value measured by the case is not necessarily calibrated. In this case, it is not possible to know the value of the forces. The measurements provided on the force input port 40 by the strain gauge are then qualitative, and not quantitative. The measurement returned by the strain gauge is multidirectional.

[0171] The strain gauge can be glued to various locations on the valve to be tested / adjusted. To obtain an optimal and most representative measurement of the forces generated on the internals, it is preferable to glue the gauge to the moving stem of the valve when possible. The following steps can be carried out: • Degrease the surface to which the strain gauge is to be glued. • Glue the strain gauge (full bridge type), for example with cyanoacrylate type glue (ex: Loctite® 4242). • Connect the strain gauge to the force input port 40, using a data transmission cable stored in housing 2 (the gauge has no polarity). • Using the control device (either via a control pressure or an electrical control current, depending on the valve), pull the valve stem (for example, to an opening of approximately 75%), then press the "T" button. A red line appears in the force zone; this corresponds to the pulling force of the packing press. • Lower the tap stem to compress it (for example, to a closed position between 25 and 50%) and press button "C". A blue line appears in the force zone; this corresponds to the compression force of the packing press.

[0172] The difference in height between the aforementioned red line and blue line represents the friction forces of the press gasket. Test example

[0173] We will now detail an example of a test carried out using the handheld terminal 1 on a "closed by lack of air" (FMA) tap equipped with an electropneumatic converter.

[0174] The steps implemented by a user of the portable terminal 1 may be - the following: • Install the linear displacement sensor according to the sequence described above. • Configure the first pressure port 14 in measurement mode using the first switch 36, so that a pressure measurement can be made using the first pressure sensor. • Press the screen reset button in the pressure area. • Connect the electrical output port 26 to the electro-pneumatic converter from the tap, using an electrical connection cable supplied in box 2. • Glue the strain gauge onto the moving stem of the valve, and connect the strain gauge to the force input port 40 using a data transmission cable supplied in housing 2. • Using the electrical current generator 24, increase the intensity of the electrical current delivered via the electrical output port 26 up to 20 mA and ensure that the measurements acquired by the first pressure sensor and by the position sensor, displayed on the screen 54, change. If this is not the case, check the wiring. • Reduce the electrical current intensity to 4mA via the dimmer of the electrical control device. • Gradually increase the intensity of the electric current from 4 to 20 mA using the dimmer 24. • When the tap is at 75% of its stroke (which can be observed by the user by observing the tap stroke indicator), press the "T" button on the screen in the effort area. • Gradually decrease the intensity of the electric current from 20mA to 4mA using the dimmer. • When the tap is at 50% of its stroke, press the "C" button on the screen in the effort zone.

[0175] Once these steps have been completed, the window of the effort zone shown in [Fig.7] displays three different curves: • a curve representing the mechanical forces experienced by the tap stem during tension and compression phases. • When the tap is in its safety position (in this example: closed due to lack of air), the tap stem presses against the tap body (compression phase). This is point "A" on the graph. • When the tap is fully open, the force is at point "B". This is a tensile force, as the tap stem is pulled to open it. The resistive force is the friction generated by the packing gland. • A line (at point "C") representing the resistance of the packing press when opening the tap. • A line (at point “D”) representing the resistance of the packing press when closing the tap.

[0176] Using these points, we can define the resistance generated by the packing press when moving the valve in this way (noting PG = Packing Press).

[0177] We have:

[0178] FPG = (FC - FD) / 2

[0179] where: • ^PG denotes ... the resistive force generated by the friction of the press-fitting • FC denotes ... the force at point C (traction force) • FD designates .. .the force at point D (compression force)

[0180] The effort consumed by the packing press is as much effort lost in pressing the tap stem onto its seat.

[0181] The bearing force of the tap stem on the body (or closing force, denoted FF) is defined by:

[0182] FF = FB-FD

[0183] Where FB denotes the effort at point B (total effort)

[0184] The force generated by the actuator of a pneumatically operated valve is defined by the following formula:

[0185] p — £ rs

[0186] With: • P designates the pressure in the actuator (indicated on the display in the pressure area). • S designates the surface area of ​​the piston or diaphragm (intrinsic characteristic of the tap supplied by the manufacturer). • F denotes the corresponding force (or effort).

[0187] Thus, the force consumed by the packing press and the bearing force of the stem on the valve body can be defined. This method makes it possible to verify that the mechanical parameters of the valve will allow it to function.

[0188] To avoid having the operator perform calculations during setup, the data measured by the terminal, which is stored in memory, can be transmitted to a computer running a calculation and visualization program. This program allows, on the one hand, the plotting of the curves of the various physical quantities generated or measured by the device, and on the other hand, the verification of the general trend of these physical quantities.

[0189] The handheld terminal 1 and the calculation and visualization program form a kit.

[0190] Data is extracted from the terminal via a USB port.

[0191] The values ​​obtained allow us to ensure the conformity of the mechanical settings of the valve.

[0192] Figures 8 to 13 show a graphical interface that can be displayed on command of the program, when this program is executed by a computer.

[0193] This graphical interface includes a strip comprising several tabs: • A tab 70 displaying data in table format, entitled "Data log", • A tab 72 for displaying time curves, entitled "Curves", • A tab 74 displaying a stroke based on pressure, entitled "Race / pressure".

[0194] Pressing the "Data log" tab 70 triggers the display of an import button 71. By pressing the import button, a set of measurements obtained using the handheld terminal 1, and subsequently exported via the USB port of this handheld terminal 1, can be imported into the program.

[0195] More specifically, pressing the import button 71 generates and displays on the graphical interface a table showing the data stored in the memory of the handheld terminal 1. The table includes a time column and additional columns for the quantities measured by the handheld terminal. Each row of the table contains a set of measurements associated with a given measurement time. In the example in [Fig. 8], the table may thus include the following columns: time (measurement time), rod force (provided by the strain gauge), linear displacement (measured by the linear position sensor 30), pressure measured by the first pressure sensor (P Act), and pressure measured by the second pressure sensor (P Instrum).

[0196] Clicking the "Curve" tab 72 displays the data as time-domain curves. Clicking this button brings up a submenu containing several buttons, each allowing the user to display a curve with one of the measured quantities on its y-axis. The buttons are as follows: • Stem effort, • Linear displacement, • Pressure act, • Instrumental pressure,

[0197] Fig. 9 shows an example of a time curve of the evolution of the measurements taken by the strain gauge over time, displayed on the graphical interface of the program following a press of the "Rod Force" button.

[0198] Figure 10 shows an example of a time curve showing the evolution of measurements taken by the linear position sensor over time, displayed on the program's graphical interface following a press of the "Linear Displacement" button.

[0199] Fig. 11 shows an example of a time curve showing the evolution of the actuator pressure measurements measured by the first pressure sensor over time, displayed on the program's graphical interface following a press of the "Pressure Act" button.

[0200] Fig. 12 shows an example of a time curve showing the evolution of the instrumentation pressure measurements measured by the first pressure sensor over time, displayed on the program's graphical interface following a press of the "Instrument Pressure" button.

[0201] The "Run / Press" button 72 allows you to display: • a curve corresponding to the displacement of the tap (on the x-axis) as a function of the pressure in the actuator (on the y-axis). • A force calculation menu: In this menu, a user can specify the type of valve being inspected, the valve's diaphragm surface area, and a number of pressures at certain characteristic points of the selected valve, as documented in the corresponding technical note. Based on this information, the program calculates a friction force in daN and a clamping force in daN when a "calculate" button is pressed in this calculation menu. 4 / Advantages

[0202] The portable terminal 1 has many advantages: • It allows for simple diagnosis and requalification of the audited equipment. • The portable terminal 1 is ideally suited to industrial environments because it is very compact, robust, and self-powered. With this solution, a single operator can adjust a pneumatic valve in two hours, whereas conventional tools require several people for three to four hours. • Ease of use; it requires no special training, its operation is intuitive. The operator does not necessarily need to be a technical expert, which saves resources and streamlines on-site work organization. • Adaptability of the device to all types of pneumatic valves. The contents of the portable terminal 1 allow work on "on / off" valves, adjusting, whether they have linear or rotary movement. • Direct display of the tap stem deformation, which ensures the theoretical watertightness of the tap (actual watertightness can only be verified after the tap is pressurized, i.e., at the start of the installation). Having only the necessary and sufficient equipment, generic and adaptable, allows for better equipment management, better maintenance, avoids forgetting on site and the risks of equipment contamination. It allows visualization of the correct coupling between the actuator and the lower, moving part of the valve. If this coupling is incorrect, the valve will not be watertight upon commissioning; this will lead to rapid degradation of the valve body, an internal leak which, depending on the type of fluid in the pipes, can cause safety issues for personnel and the installation, as well as downtime and production losses.

Claims

Claims

1. Portable terminal (1) for testing or adjusting a pneumatically controlled tap (R, R'), the portable terminal (1) comprising a housing (2) containing: • a control device configured to emit a control signal for opening or closing the tap, • a pressure sensor configured to measure a pressure induced towards the tap by the control signal at a given instant, • a position sensor (30, 32) configured to measure a position at the given instant of a movable element of an actuator of the tap which moves during the opening or closing of the tap.

2. Portable terminal (1) according to the preceding claim, wherein the control device comprises an electrical output port (26) for delivering a control current to an electropneumatic converter of the valve.

3. A portable terminal (1) according to the preceding claim, wherein the control device comprises a dimmer for varying an intensity of the control current within a predefined range, for example the range from 4 milliamps to 20 milliamps.

4. A portable terminal (1) according to any preceding claim, wherein the control device comprises a pressure port (14) for delivering a control pressure to the valve actuator.

5. Portable terminal (1) according to the preceding claim, wherein the portable terminal (1) comprises a switch (36) for configuring the pressure port (14): • in a control mode, in which the pressure port (14) delivers the control pressure, • in a measurement mode, in which the pressure port (14) communicates the induced pressure to the pressure sensor.

6. A portable terminal (1) according to any one of claims 4 and 5, wherein the control device further comprises a pressure regulator (16) configured to set the control pressure to different values ​​within a predefined pressure range.

7. A portable terminal (1) according to the preceding claim, wherein the control device comprises a pressure inlet for receiving an input pressure from a pressure source external to the portable terminal (1), and wherein the pressure reducer (16) is configured to generate the control pressure to the actuator from the input pressure.

8. A portable terminal (1) according to any one of claims 4 to 7, wherein the control device comprises a second pressure port (20) for delivering a second control pressure to a positioner of the valve.

9. Portable terminal (1) according to the preceding claim, further comprising: • a second pressure sensor configured to measure a second pressure induced in the actuator by the control signal at the given instant, • a second switch (38) for configuring the second pressure port (20): • in a control mode in which the second pressure port (20) delivers the control pressure to the positioner, • in a measurement mode in which the second pressure port (20) communicates the second induced pressure to the second pressure sensor.

10. Portable terminal (1) according to any one of claims 8 and 9, in their dependence on claim 6, in which • the regulator (16) is configured to vary the control pressure in the predefined pressure range according to a first step, the pressure range has a first upper limit, • the control device further comprises a second regulator (22) configured to adjust the second control pressure to different values ​​contained in a second predefined pressure range, and to vary the second pressure in the second pressure range predefined according to a second step, the second pressure range has a second upper limit, • the second step is different from the first step, for example lower than the second step and / or the second upper limit is different from the first upper limit, for example lower than the first upper limit.

11. A portable terminal (1) according to any preceding claim, comprising a display screen (54) configured to display pressure and position.

12. A portable terminal (1) according to claim 11, wherein the housing (2) comprises: • a base (4) delimiting a lower compartment in which the control device, the pressure sensor and the position sensor (30, 32) are stored, • a cover (6) delimiting an upper compartment in which the display screen (54) is stored, the cover (6) being rotatable relative to the base (4) between • a closed position in which the housing (2) is closed and the display screen (56) is hidden from the user, • an open position in which the control device, the pressure sensor and the position sensor (30, 32) are accessible by a user, and in which the display screen (54) is visible to the user.

13. A portable terminal (1) according to any preceding claim, further comprising a force input port (40) configured to receive a force measured by a strain gauge attached to the valve stem.

14. A portable terminal (1) according to any preceding claim, comprising a memory configured to store the pressure and position in association with the given time.

15. Kit comprising: a portable terminal (1) according to any one of the res-

16. previous instructions, and • a computer for executing program code instructions for displaying time curves including pressure and position on a computer screen. A method of testing or adjusting a pneumatically operated valve using the portable terminal (1) according to any one of claims 1 to 14, the method comprising steps of: • emission, by the control device, of a control signal to open or close the valve, • measurement, by the pressure sensor, of a pressure induced in the valve by the control signal at a given time, • measurement, by the position sensor, of a position of a moving element at the given instant of a valve actuator which moves during the opening or closing of the valve.

Images