KR101371344B1 - Apparatus for remotely detecting position using oil hydraulic motor - Google Patents

Abstract

The present invention relates to an apparatus for remotely detecting a position and, more particularly, to an apparatus for remotely detecting a position using a hydraulic motor for detecting the opening and closing positions of a remote valve. The apparatus for remotely detecting a position using a hydraulic motor according to the present invention comprises a pair of hydraulic lines arranged on the opening side and closing side of a hydraulic actuator, which generates actuation pressure, respectively to supply or recover hydraulic oil; a hydraulic motor arranged at one side of the hydraulic lines to generate rotational force via the flow of the hydraulic oil; a counter for detecting the rotating number and rotating direction of the hydraulic motor and generating rotating number information and rotating direction information; a controller for receiving the rotating number information and the rotating direction information from the counter, calculating the value of flow supplied or recovered to or from either the opening side or closing side of the hydraulic actuator, determining the opening and closing positions of the valve based on the value of flow and generating opening and closing information in real time; and a position indicator for receiving opening and closing information from the controller and displaying the information. [Reference numerals] (20) Actuator

Description

Remote position detection device using hydraulic motors {APPARATUS FOR REMOTELY DETECTING POSITION USING OIL HYDRAULIC MOTOR}

The present invention relates to a remote position detection device, and more particularly, to a remote position detection device using a hydraulic motor for detecting the opening and closing position of a valve located at a far distance.

In general, when a valve is installed in a ship or the like, since the valve is installed at a depth deep like a tank or the sea, it is difficult for human access, so a remote controller is attached to the upper end of the valve to operate the valve remotely using hydraulic pressure.

Most remote-operated hydraulic actuators use an electric limit switch or potentiometer to check the valve position remotely, but the electric limit switch or potentiometer is highly accurate. There is a problem of inferior safety and water tightness due to use in the depth of water.

In addition, in the case of the electric limit switch, there is an inconvenience in that an electric line must be connected to the hydraulic operation unit by the limit switch on the valve side. Furthermore, there is a problem in that the electric wire is cut in the middle or the power supply is interrupted in case of power failure, and thus the position of the valve cannot be detected.

Republic of Korea Patent Publication No. 10-1040133 (2011.06.09.) Republic of Korea Patent Publication No. 10-2010-0066068 (2010.06.17.) Republic of Korea Patent Publication No. 10-2003-0066855 (2003.08.14.)

The present invention has been made to solve the above problems, an object of the present invention is to provide a remote position detection device that can accurately and safely detect the opening and closing position of the valve without a separate electric wire.

In addition, an object of the present invention is to provide a remote position detection device that can detect and display the open and close position of the valve without external power supply.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems to be solved by the present invention, which are not mentioned here, As will be appreciated by those skilled in the art.

The remote position detection device using the hydraulic motor according to the present invention includes a pair of hydraulic lines provided to supply or withdraw hydraulic oil to each of an open side and a shielding side of a hydraulic actuator for generating driving hydraulic pressure for opening and closing a valve; It is provided on one side of the hydraulic line, the hydraulic motor for generating a rotational force by the flow of the working oil; A counter for detecting rotational speed and rotational direction of the hydraulic motor and generating rotational speed information and rotational direction information; Receives the rotation speed information and the rotation direction information from the counter, calculates the flow rate value supplied or recovered to one of the open side or the shielding side of the hydraulic actuator, and determine the opening and closing position of the valve from the flow rate value in real time A controller for generating; And a position indicator which receives and displays the opening and closing position information from the controller.

In addition, the remote position detection device applying the hydraulic motor of the present invention, the generator is connected to the hydraulic motor for generating electrical energy; And a constant voltage circuit converting the generated electric energy into a constant voltage source and supplying the generated electric energy to the voltage source of the controller.

In addition, in the present invention, when the hydraulic motor is provided on the open side of the hydraulic line, when the flow value increases in the direction to be supplied, the controller determines that the valve is open, and continues to increase in the direction where the flow rate value is supplied in advance If the first flow rate threshold is exceeded, the controller determines that the valve is fully open, and if the flow value is increased in the direction in which the flow rate is recovered, the controller determines that the valve is shielded and continues in the direction in which the flow value is recovered. If the increase exceeds the second preset flow rate threshold, the controller determines that the valve is completely shielded.

In addition, the remote position detection device applying the hydraulic motor of the present invention, the first pressure sensor is provided on the open side of the hydraulic line, the first pressure sensor for generating the first pressure information by detecting the hydraulic pressure generated on the open side of the hydraulic actuator; And a second pressure sensor provided at the shielding side of the hydraulic line and configured to generate the second pressure information by sensing the hydraulic pressure generated at the shielding side of the hydraulic driver. The controller may further include the first pressure information or the second pressure information. Receiving and correcting the opening and closing position information of the valve according to the flow rate value.

In addition, in the present invention, even when the valve is determined to be in the fully open state, the first flow rate threshold value is determined if the first pressure information does not reach the preset first maximum value and the second pressure information does not reach the preset first minimum value. And increase the first flow rate threshold value when the first pressure information has already reached the first maximum value and the second pressure information has reached the first minimum value even when it is determined that the valve is in the open state. If the first pressure information does not reach the preset second minimum value and the second pressure information does not reach the preset second maximum value, even when the valve is determined to be fully shielded, the second flow rate threshold is increased. And if it is determined that the valve is in the closed state, if the first pressure information has already reached the second minimum value and the second pressure information has already reached the second maximum value, correcting the second flow rate threshold value to reduce it. It features.

In addition, the position indicator of the present invention, the first electromagnet for indicating the fully open state, the second electromagnet for indicating the operating state, and the third electromagnet for indicating the fully shielded state in the left and right directions in order A position electromagnet having a through portion formed in the middle of the up and down direction, and a display bar accommodated in the through portion of the position electromagnet and extending in the left and right directions, when opening and closing position information is supplied from the controller to the position electromagnet, Any one of the electromagnets and the third electromagnets may operate as a magnet so that the display bar moves to the electromagnet.

By the means for solving the above problems, the remote position detection device to which the hydraulic motor of the present invention is applied has an effect of accurately and safely detecting the open / close position of the valve remotely without an electric wire.

In addition, the remote position detection device to which the hydraulic motor of the present invention is applied has an effect of detecting and displaying the open / close position of the valve without external power supply.

1 is a view schematically showing a remote position detection apparatus using a hydraulic motor according to a first embodiment of the present invention.
2 is a view schematically showing a remote position detection apparatus using a hydraulic motor according to a second embodiment of the present invention.
3 is a view schematically showing a remote position detection apparatus using a hydraulic motor according to a third embodiment of the present invention.
4 is a schematic view for explaining a position indicator according to an embodiment of the present invention.

Specific matters including the problem to be solved, the solution to the problem, and the effects of the present invention as described above are included in the embodiments and drawings to be described below. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the accompanying drawings.

≪ Embodiment 1 >

1 is a view schematically showing a remote position detection apparatus using a hydraulic motor according to a first embodiment of the present invention.

As shown in Figure 1, the remote position detection device applying the hydraulic motor according to the first embodiment of the present invention, the hydraulic line 110, hydraulic motor 120, counter 130, controller 140 and The location indicator 150 is included.

The hydraulic lines 110 are provided in pairs for supplying or retrieving hydraulic oil to each of the open side and the shield side of the hydraulic actuator 20 for generating drive hydraulic pressure for opening and closing the valve 10. Specifically, the valve 10 is installed remotely from the remote position detector, such as a ship's tank or deep in the sea. In the case of the hydraulic actuator 20, in the form of a cylinder, the open side and the shielding side are separated by a cylinder head and a piston inside the cylinder. The hydraulic fluid may be supplied to the open side of the hydraulic actuator 20 through the hydraulic pump 30 to open the valve 10, and the hydraulic oil may be recovered from the open side of the hydraulic actuator 20 through the hydraulic pump 30 to provide a valve ( 10) can be shielded. On the shielding side of the hydraulic actuator 20, hydraulic fluid is recovered when the valve 10 is opened, and hydraulic fluid is supplied when the valve 10 is shielded. Accordingly, the hydraulic line 110 supplies the hydraulic oil to the open side hydraulic line 110a and the shielding side of the hydraulic driver 20 provided to supply or retrieve the hydraulic oil to the open side of the hydraulic driver 20. It is composed of a shielding side hydraulic line (110b) provided to recover.

The hydraulic motor 120 is provided on one side of the pair of hydraulic lines 110a and 110b and generates rotational force by the flow of the working oil. Specifically, as shown in FIG. 1, the hydraulic motor 120 may be installed in the open side hydraulic line 110a and rotate in accordance with the flow of hydraulic oil generated to open and close the valve 10. The rotation operation of the hydraulic motor 120 is used to detect the flow rate of the counter 130, and is also used to generate electrical energy of the generator 180 described later in the third embodiment.

The counter 130 detects the rotation speed and the rotation direction of the hydraulic motor 120 to generate the rotation speed information and the rotation direction information. That is, the counter 130 is composed of an encoder (counter) counting the number of revolutions in conjunction with the rotation of the hydraulic motor (120). The counter 130 detects not only the rotational speed of the hydraulic motor 120 but also the rotational direction, and determines whether the hydraulic oil is supplied from the open side hydraulic line 110a or vice versa as shown in FIG. 1. .

The controller 140 receives the rotation speed information and the rotation direction information from the counter 130, calculates a flow rate value supplied or recovered to one side of the open side or the shield side of the hydraulic actuator 20, and calculates a valve ( 10) determine the open and close position to generate the open and close position information in real time. Specifically, in the case of the hydraulic actuator 20, the open side and the shielding side in the form of a cylinder are separated by the cylinder head and the piston, so that the flow rate of the hydraulic oil sent to the open side or the shielding side 10 The open / close position of the can be checked remotely.

That is, by detecting the flow rate and the flow direction of the operation oil, it is possible to calculate the opening and closing position of the valve 10 as the ratio of the current flow rate in comparison to the total flow rate required for the operation of the hydraulic actuator (20). In addition, the flow rate detection method of the present invention has an advantage of excellent watertightness and safety as compared with the conventional electric limit switch.

The position indicator 150 receives and displays the opening and closing position information from the controller 140. In other words, the display can be divided into a fully open state, a completely shielded state, and an operating state.

Looking at the operation characteristics of the remote position detection device to which the hydraulic motor according to the first embodiment of the present invention configured as described above are as follows. At this time, in the first embodiment of the present invention, as shown in Figure 1, the case where the hydraulic motor 120 is provided on the open side (110a) of the hydraulic line as an example.

First, when hydraulic oil is supplied from the hydraulic pump 30 to the hydraulic driver 20, the hydraulic motor 120 is rotated in the direction in which the hydraulic oil 120 is supplied. The counter 130 generates the rotation speed information and the rotation direction information, and the controller 140 calculates the increase in the direction in which the flow rate value is supplied. Accordingly, the controller 140 determines that the valve 10 is open, and the position indicator 150 is displayed as in operation.

Subsequently, when the flow rate value continues to increase in the direction in which the flow rate is supplied and exceeds the preset first flow rate threshold value, the controller 140 determines that the valve 10 is completely opened, and the position indicator 150 It is marked as fully open. Here, the first flow rate threshold value is a total flow rate value required for the fully open operation of the valve 10 and is set in advance at the time of manufacture.

Subsequently, when hydraulic oil is recovered from the hydraulic driver 20 to the hydraulic pump 30, the hydraulic motor 120 is rotated in the recovery direction. The counter 130 generates the rotation speed information and the rotation direction information, and the controller 140 calculates the increase in the direction in which the flow rate value is recovered. Accordingly, the controller 140 determines that the valve 10 is being shielded, and the position indicator 150 is displayed as in operation.

Subsequently, if the flow rate value continues to increase in the recovery direction and exceeds the second preset flow rate threshold, the controller 140 determines that the valve 10 is completely shielded, and the position indicator 150 It is marked as full shield. Here, the second flow rate threshold value is a total flow rate value required for the complete shielding operation of the valve 10 and is set in advance at the time of manufacture.

As such, the remote position detection device using the hydraulic motor according to the first embodiment of the present invention has an advantage of accurately and safely detecting the open / close position of the valve remotely without a separate electric wire.

Second Embodiment

2 is a view schematically showing a remote position detection apparatus using a hydraulic motor according to a second embodiment of the present invention.

As shown in FIG. 2, the remote position detection apparatus using the hydraulic motor according to the second embodiment of the present invention includes a hydraulic line 110, a hydraulic motor 120, a counter 130, a controller 140, The position indicator 150 includes a first pressure sensor 160 and a second pressure sensor 170.

Here, the remote position detection device using the hydraulic motor according to the second embodiment of the present invention, like the remote position detection device using the hydraulic motor according to the first embodiment of the present invention, the hydraulic line 110, hydraulic pressure Motor 120, counter 130, controller 140, and position indicator 150, the structure and operating characteristics of each component being the same or similar to the first embodiment of the present invention, The description will refer to the first embodiment of the present invention described above with reference to FIG. 1 and will be omitted later.

The remote position detection device using the hydraulic motor according to the second embodiment of the present invention is provided on the open side hydraulic line 110a of the hydraulic line, and detects the hydraulic pressure generated on the open side of the hydraulic driver 20. The first pressure sensor 160 for generating the pressure information and the shielding side hydraulic line 100b among the hydraulic lines are provided, and the second pressure information is generated by detecting the hydraulic pressure generated at the shielding side of the hydraulic actuator 20. It further comprises a second pressure sensor 170 to. Here, the first pressure information and the second pressure information are values indicating only the oil pressure in the direction supplied to the hydraulic driver 20 on both the open side and the shielding side.

Further comprising such sensors, the controller 140 according to the second embodiment of the present invention receives the first pressure information or the second pressure information, to correct the opening and closing position information of the valve 10 according to the flow rate value It is possible.

That is, in the second embodiment of the present invention, in addition to the method according to the first embodiment of the present invention for detecting the flow rate of the hydraulic oil and calculating the valve opening and closing position, the pressure of the hydraulic oil sent to the hydraulic actuator 20 is constant. If the pressure is more than, to use the point to confirm that the opening and closing operation of the valve 10 is finished.

Specifically, even when the flow rate value exceeds the first flow rate threshold and the controller 140 determines that the valve 10 is fully open, the controller 140 reaches the first maximum value at which the first pressure information is preset. And whether the second pressure information has reached a preset first minimum value.

After checking, when the first maximum value and the first minimum value are reached, the valve 10 is finally determined to be fully open and displayed through the position indicator 150.

On the other hand, if the first maximum value and the first minimum value are not reached after confirmation, it is determined that the flow rate is partially insufficient until the actual full opening, and is corrected to increase the first flow rate threshold. That is, the first flow rate threshold value is changed to a flow rate value when the hydraulic oil is further supplied to the open side of the hydraulic actuator 20 to reach the first maximum value and the first minimum value. When the flow rate value exceeds the corrected first flow threshold value, the position indicator 150 is displayed as fully open.

Here, the first maximum value corresponds to the pressure value of the hydraulic oil represented by a predetermined value or more in the open side hydraulic line (110a) at the end of the opening operation of the valve 10, the first minimum value is the opening of the valve 10 Corresponds to the pressure value of the hydraulic oil represented by a predetermined value or less in the shielding side hydraulic line (110b) at the end of the operation.

On the other hand, even when the flow rate value does not reach the first flow threshold and the controller 140 is determined to be in the open state of the valve 10, the first pressure information has already reached the first maximum value and the second pressure is reached. If the information has already reached the first minimum value, it is determined that the valve 10 is already fully open and the first flow rate threshold is set somewhat higher, and is corrected to reduce the first flow rate threshold. When the lowered first flow rate threshold is exceeded, the position indicator 150 is displayed as fully open.

Similarly, even when the valve 10 is determined to be completely shielded by the second flow rate threshold value, the first pressure information does not reach the preset second minimum value and the second pressure information does not reach the preset second maximum value. If so, correct to increase the second flow threshold.

Further, even when it is determined that the valve 10 is being shielded by the second flow threshold, if the first pressure information has already reached the second minimum value and the second pressure information has already reached the second maximum value, the second flow threshold Correct it to decrease the value.

Here, the second minimum value corresponds to the pressure value of the hydraulic oil represented by a predetermined value or less in the open side hydraulic line (110a) at the time when the closing operation of the valve 10, the second maximum value is the shielding of the valve 10 Corresponds to the pressure value of the hydraulic oil represented by a predetermined value or more in the shielding side hydraulic line (110b) at the end of the operation.

As such, the remote position detection device using the hydraulic motor according to the second embodiment of the present invention has an advantage of more accurately detecting the open / close position of the valve from a remote location.

Third Embodiment

3 is a view schematically showing a remote position detection apparatus using a hydraulic motor according to a third embodiment of the present invention.

As shown in Figure 3, the remote position detection device applying the hydraulic motor according to the third embodiment of the present invention, the hydraulic line 110, hydraulic motor 120, counter 130, controller 140, The position indicator 150 includes a first pressure sensor 160, a second pressure sensor 170, a generator 180, and a constant voltage circuit 190.

Here, the remote position detection device using the hydraulic motor according to the third embodiment of the present invention, like the remote position detection device using the hydraulic motor according to the second embodiment of the present invention, the hydraulic line 110, hydraulic pressure The motor 120, the counter 130, the controller 140, the position indicator 150, the first pressure sensor 160 and the second pressure sensor 170, the structure and operation characteristics of each component Since it is the same as or similar to the second embodiment of the present invention, a detailed description thereof will be referred to the second embodiment of the present invention described above with reference to FIG.

The remote position detection device using the hydraulic motor according to the third embodiment of the present invention, the generator 180 is connected to the hydraulic motor to generate electrical energy, and converts the generated electrical energy into a constant voltage source, the controller 140 It is possible to further include a constant voltage circuit 190 for supplying a voltage source.

That is, in the third embodiment of the present invention, the hydraulic motor 120 rotated by the hydraulic pressure is used not only for detecting the flow rate but also for generating electric energy. There is an advantage that can detect and display the opening and closing position of the valve 10 without a power outage or external power supply.

4 is a view schematically showing a position indicator according to an embodiment of the present invention.

As shown in FIG. 4, the position indicator 150 according to an exemplary embodiment of the present invention includes a first electromagnet 151a for indicating a fully open state and a second electromagnet 151b for indicating an operating state. And, the third electromagnet 151c for indicating a completely shielded state is provided adjacent to each other in the left and right direction in order, the position electromagnet 151 and the through portion of the position electromagnet 151 having a through portion formed in the middle of the vertical direction When the opening and closing position information is supplied to the position electromagnet 151 from the controller 140, including the display bar 152, which is accommodated in the left and right directions, of the first electromagnet 151a to the third electromagnet 151c. Any one acts as a magnet, so that the display bar 152 can move to the electromagnet.

That is, the basic driving principle of the position indicator 150 is an electromagnet. It consists of three electromagnets, each of which acts on the “open”, “in operation” and “closed” information of the valve 10. The controller 140 displays the open information when the valve 10 is fully open, the closed information when the valve 10 is fully shielded, and the information in operation when the valve 10 is operating. Sent to). At this time, the above information is sent only 1 second to 2 seconds. By supplying the above information, the electromagnets 151a, 151b, and 151c corresponding to the information are operated, so that the indicator bar 152, which is an indicator, pops out to each position of the open or the closed, During operation, both ends of the display bar 152 are hidden inside. Even after the operation is completed or during operation, even if the hydraulic pressure stops, the position is displayed continuously.

In FIG. 4, three electromagnets are used to show three states of fully open and fully shielded during operation. However, only two fully electromagnets may be used to display only fully open and completely shielded. By using two electromagnets, it is also possible to represent four states of full shielding during full open, open operation, and shield operation.

As such, the remote position detection device using the hydraulic motor according to an embodiment of the present invention is a remote position detection device for a remotely operated hydraulic actuator, and the remote position detection device uses a hydraulic force used for driving a valve. The current state of the valve can be detected and informed. That is, the generator is mounted on the hydraulic motor to generate electricity, and the controller is driven using the generated electricity. The controller recognizes the valve opening / closing position through the counter connected to the hydraulic motor, and reads the pressure from the pressure sensor. It is possible to correct this and display it. Specifically, the remote position detection device using the hydraulic motor according to an embodiment of the present invention, the generator is mounted on the hydraulic motor to generate a DC voltage, generating power to generate a constant voltage, the hydraulic motor is equipped with a counter Position detection means for converting the opening and closing position of the valve into a numerical value and an electrical signal, position display means for displaying the current position of the valve even when the electric supply is cut off using the principle of electromagnet, And a control means for accurately calculating and displaying the valve position as values of the pressure sensor and the position detecting device respectively installed on the open side and the shielding side of the valve, and transmitting it to the position display means.

In terms of operating characteristics, a hydraulic motor is installed in one of the hydraulic lines required to drive the valve, and a generator is installed there. Since the electricity generated at this time is severely fluctuated in pressure, a constant voltage circuit is inserted to supply voltage to the controller.

In addition, by installing a counter in the hydraulic motor can extract the actual flow rate can be detected through this position of the actual valve.

In addition, the controller operates with the voltage received through the generator and the constant voltage circuit, and indicates the position of the valve through the flow value received through the counter. The controller may correct the open / close position by using pressure sensors respectively installed on the open side and the shield side of the hydraulic line to correct an error of the hydraulic motor.

The controller also sends the position of the valve to the position indicator. At this time, the controller sends three pieces of information: “open”, “active” and “closed”.

As described above, it is to be understood that the technical structure of the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the above description, and the meanings and ranges of the claims and their equivalents. All changes or modifications derived from the concept should be construed as being included in the scope of the present invention.

10: valve
20: hydraulic actuator
30: hydraulic pump
110: hydraulic line
110a: Open side hydraulic line
110b: shielded side unit line
120: hydraulic motor
130: counter
140:
150: position indicator
151: position electromagnet
151a: first electromagnet
151b: the second electromagnet
151c: third electromagnet
152: display bar
160: first pressure sensor
170: second pressure sensor
180: generator
190: constant voltage circuit

Claims (6)

A pair of hydraulic lines provided to supply or withdraw hydraulic oil to each of an open side and a shielding side of the hydraulic actuator for generating driving hydraulic pressure for opening and closing the valve;
A hydraulic motor provided at one side of the hydraulic line and generating a rotational force by the flow of the working oil;
A counter for detecting rotation speed and rotation direction of the hydraulic motor and generating rotation speed information and rotation direction information;
Receiving the rotation speed information and the rotation direction information from the counter, calculating a flow rate value supplied or recovered to one of the open side or the shielding side of the hydraulic actuator, and determining the opening / closing position of the valve from the flow rate value A controller for generating opening and closing position information in real time; And
A position indicator which receives and displays the opening / closing position information from the controller;
Remote position detection device using a hydraulic motor comprising a. The method of claim 1,
A generator connected to the hydraulic motor to generate electric energy; And
A constant voltage circuit converting the generated electric energy into a constant voltage source and supplying the generated electric energy to the voltage source of the controller;
Remote position detection device applying a hydraulic motor, characterized in that it further comprises. The method of claim 1,
When the hydraulic motor is provided on the open side of the hydraulic line,
If the flow rate value increases in the direction in which the flow rate is supplied, the controller determines that the valve is open and continues to increase in the direction in which the flow rate value is supplied. When the first flow rate threshold value is exceeded, the controller Judging that the valve is fully open,
If the flow rate value increases in the direction in which the flow rate is recovered, the controller determines that the valve is being shielded and continues to increase in the direction in which the flow rate value is recovered. When the flow rate value exceeds the second preset flow rate threshold, the controller A remote position detection device using a hydraulic motor, characterized in that it is determined that the valve is completely shielded. The method of claim 3,
A first pressure sensor provided at an open side of the hydraulic line and configured to generate first pressure information by detecting a hydraulic pressure generated at an open side of the hydraulic driver; And
A second pressure sensor provided at a shielding side of the hydraulic line and configured to generate second pressure information by sensing a hydraulic pressure generated at the shielding side of the hydraulic driver;
Further comprising:
And the controller receives the first pressure information or the second pressure information and corrects the opening / closing position information of the valve according to the flow rate value. 5. The method of claim 4,
Even when it is determined that the valve is fully open, the first flow rate threshold is increased when the first pressure information does not reach a preset first maximum value and the second pressure information does not reach a preset first minimum value. To make it work,
Even when it is determined that the valve is in the open state, if the first pressure information has already reached the first maximum value and the second pressure information has reached the first minimum value, the correction is made so as to reduce the first flow rate threshold. ,
Even when it is determined that the valve is in a fully shielded state, if the first pressure information does not reach a preset second minimum value and the second pressure information does not reach a preset second maximum value, the second flow rate threshold value is increased. To make it work,
Even when it is determined that the valve is in the closed state, if the first pressure information has already reached the second minimum value and the second pressure information has reached the second maximum value, the second flow rate threshold is corrected to decrease. Remote position detection device using a hydraulic motor, characterized in that. The method of claim 1,
The position indicator,
A first electromagnet for indicating a fully open state, a second electromagnet for indicating a state of operation, and a third electromagnet for indicating a state of complete shielding are sequentially provided in the left and right directions, and are disposed in the middle of the vertical direction. A position electromagnet having a through portion formed therein;
Including a display bar accommodated in the penetrating portion of the position electromagnet extending in the left and right directions,
When the opening and closing position information is supplied to the position electromagnet from the controller, any one of the first electromagnet or the third electromagnet is operated as a magnet, so that the display bar moves to the electromagnet. Remote location detector.

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