JP2544856B2 - Safety valve operation test device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation test device for a safety valve used in a pressure fluid accumulator represented by, for example, a main steam pipe of a thermal power plant. It can be attached to and used for accurate operation tests.

[0002]

2. Description of the Related Art As is well known, a pressure relief valve is provided in a pressure fluid accumulator such as a main steam pipe of a thermal power plant in order to prevent the fluid pressure inside the pressure accumulator from exceeding a specified value. Installed and tested for operation on a regular basis and as needed. As the operation test means of such a safety valve, the first method of actually increasing the fluid pressure inside the pressure accumulator to a specified value or more to confirm the opening of the valve body, and the method other than the fluid pressure inside the pressure accumulator in the valve body The external pressure in the opening direction is sequentially applied to the valve, and the opening pressure of the valve body is calculated based on the external pressure at the opening of the valve body and the fluid pressure in the pressure accumulating section. There is a second method of testing without increasing the above.

Of these, the first method is not used so much because it is necessary to stop the operation of the equipment using the pressure accumulator and there is a problem in safety, and the equipment remains in operation. In other words, the second method, which allows an operation test while the fluid pressure in the pressure accumulating section remains at the normal value, is now widely used. First, FIG. 4 shows a conventional safety valve actuation test device using such a second method.

This conventional device is applied to a main steam pipe safety valve of a pressurized water nuclear power plant.
The valve body 12 for opening and closing a part thereof, the valve body 13 that is connected to the valve body 12 and opens and closes the valve body 12 by moving in the vertical direction in the figure, and the valve body 13 A yoke 14 for movably supporting the middle and up and down directions, a spring 15 for urging the valve rod 13 downward in the drawing, that is, a direction for closing the valve body 12, and a valve against the urging force of the spring 15. A safety valve 17 having a detection unit 16 that detects that the main body 12 is in an open state is installed.

Of these, the detection unit 16 is a hydraulic pressure transducer 18 for measuring the hydraulic pressure supplied from the outside.
And a hydraulic jack 19 which is driven by hydraulic pressure supplied from the outside to pull the valve rod 13 upward in the drawing, that is, which gives a pulling load to the valve body 12 in the opening direction, and which is given to the valve rod 13 by the hydraulic jack 19. It is composed of a valve rod pull-up load cell 20 for measuring a pulling load.

The safety valve 17 includes a hydraulic pressure control device 21 for supplying hydraulic pressure to a hydraulic jack 19 via a hydraulic pressure transducer 18, a hydraulic pressure measured by the hydraulic pressure transducer 18, and a valve rod pull-up load cell 20. An operation test is performed by the control device 22 which processes and records the operation test result of the safety valve 17 based on the pulling load measured in 1 above, the steam pressure in the main steam pipe 11, and the like.

In this case, the hydraulic control device 21 controls the hydraulic pressure generated by the hydraulic pump 23 with the regulator 24 and outputs the hydraulic pressure via the relief valve 25 and the electromagnetic valve 26. The solenoid valve 28 that supplies the output hydraulic pressure to the detection unit 16, and the hydraulic device 2
7 and a hydraulic control panel 29 for operating and controlling the solenoid valve 28.

Further, the control device 22 controls the hydraulic pressure measured by the hydraulic pressure transducer 18 of the detector 16,
A data accumulator 31 into which the pull-up load measured by the valve rod pull-up load cell 20 and the steam pressure in the main steam pipe 11 measured by the steam pressure transducer 30 attached to the main steam pipe 11 are input. An arithmetic processing unit 32 having a function of data processing and recording the operation test result of the safety valve 17 based on various data accumulated in the data accumulating device 31.

In the safety valve actuation test device having the above-mentioned structure, when the steam pressure in the main steam pipe 11 is about 80% of the blowout set pressure of the safety valve 17, the hydraulic jack 19 applies a pulling load to the valve rod 13. The sum of the steam pressure in the main steam pipe 11 at the time of blowing and the pressure obtained by converting the lifting load of the valve rod 13 into steam is measured as the blowing pressure of the safety valve 17. Specifically, from the hydraulic control device 21 through the hydraulic pressure transducer 18, the hydraulic jack 1
The hydraulic pressure is supplied to 9 to sequentially increase the lifting load applied to the valve rod 13.

The fact that the safety valve 17 has started to blow out means that the hydraulic pressure measured by the hydraulic pressure transducer 18 and the pull-up load measured by the valve rod pull-up load cell 20 fluctuate (decrease) at the same time. The sum of the steam pressure in the main steam pipe 11 at that time and the pressure obtained by converting the lifting load of the valve rod 13 into steam is calculated as the blowing pressure of the safety valve 17, and the result is CR.
It is displayed on the T (cathode ray tube) screen or printed out, and the operation test of the safety valve 17 is performed there.

However, in the conventional safety valve operation test device as described above, the measured value of the pulling load of the valve rod 13 is used to detect that the safety valve 17 has reached the blowing operation and to calculate the blowing pressure of the safety valve 17. Therefore, it is necessary to install the valve rod pull-up load cell 20 on the safety valve 17, which causes a problem that the configuration becomes complicated. Further, since a large number of safety valves 17 are usually installed in the main steam pipe 11, it is economically disadvantageous to install the valve rod pull-up load cells 20 in all the safety valves 17, respectively. There is inconvenience.

Here, in particular, the automated conventional safety valve operation test device as described above is a safe and rational operation test for a large number of safety valves 17 installed in the main steam pipe 11 with a small number of workers. The hydraulic control device 21 and the control device 22 are collectively installed in a place distant from the main steam pipe 11, and hydraulic pressure is applied to each safety valve 17 via a pipe. It is said that the measurement results of the hydraulic pressure transducer 18 and the valve rod lifting load load cell 20 which are supplied or installed in each safety valve 17 are collected in the data accumulating device 31 via the wiring and are collectively processed by the arithmetic processing device 32. At present, for example, there is only one pressurized water nuclear power plant constructed on an overall scale.

On the other hand, recently, one safety valve 17
However, there is also a demand for the development of a small-scale portable safety valve operation test device that can automatically perform its operation test. And in such a portable safety valve operation test device, of course,
It is required to be small and lightweight, easily attachable to and detachable from the safety valve 17, easy to handle, and capable of obtaining highly accurate test results. Further, it is desired that the operation test be performed without providing the valve stem pull-up load cell 20 on the safety valve 17 to simplify the configuration and be economically advantageous.

[0014]

As described above, in the conventional automated safety valve actuation test device, for example, there is only a large-scale system constructed in one pressurized water nuclear power plant on an overall scale. , There is a strong demand for the development of a small portable safety valve actuation test device. Further, also in the development of this kind of portable safety valve operation test device, it is possible to simplify the structure and make it economically advantageous as a structure in which an operation test can be performed without providing a valve rod pull-up load cell on the safety valve. Is desired.

Therefore, the present invention has been made in consideration of the above circumstances. It is small and lightweight, can be easily attached to and detached from a safety valve, is easy to handle, can obtain highly accurate test results, and simplifies the configuration. An object of the present invention is to provide an extremely good safety valve operation test device which can be economically advantageous.

[0016]

A safety valve actuation test apparatus according to the present invention is installed in a pressure fluid accumulator, and when the fluid pressure in the pressure accumulator exceeds a specified value, the valve body is part of the accumulator. To prevent an increase in the fluid pressure in the pressure accumulating section, and has a cylinder that applies a pressure in the opening direction to the valve body by injecting a pressure fluid from an injection port opened to the outside. A safety valve configured to open the valve body even when the fluid pressure in the pressure accumulator is less than a specified value by injecting a pressure fluid into the cylinder during the operation test of the valve body.

The safety valve has a removable hose-like member at the inlet, and a pressure setting operation is performed until the fluid pressure in the cylinder of the safety valve reaches the set pressure via the hose-like member. A portable automatic pump device that automatically injects pressure fluid into the inlet of the safety valve,

The portable automatic pump device has a recorder for recording the fluid pressure in the hose-shaped member, and when the portable automatic pump device is injecting the pressurized fluid into the inlet of the safety valve, the valve of the safety valve is opened. Opening the valve body by detecting the fluctuation of fluid pressure in the hose-shaped member due to the opening of the body
A portable measuring device for measuring and recording the pressure in the cylinder immediately before , and for stopping the supply of the pressure fluid to the inlet of the safety valve by the portable automatic pump device to reduce the pressure in the cylinder is provided.

[0019]

According to the above-mentioned structure, the pressure setting operation is carried out until the fluid pressure in the cylinder of the safety valve reaches the set pressure through the removable hose-like member at the inlet of the safety valve. A portable automatic pumping device that automatically injects pressurized fluid, and a change in fluid pressure in the hose-shaped member due to the opening of the valve body of the safety valve is detected to detect the pressure in the cylinder immediately before opening the valve body. Since the portable measuring device for measuring and recording is provided, it is small and lightweight, can be easily attached to and detached from the safety valve, is easy to handle, and can obtain highly accurate test results. Further, since the opening of the valve body is detected by detecting the fluctuation of the fluid pressure in the hose-shaped member, there is no need to provide a valve rod pull-up load cell on the safety valve as in the prior art, Can be simplified and economically advantageous.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 33 is a main steam pipe, and an opening 35 for installing a safety valve 34 is formed on the peripheral side thereof. The safety valve 34 includes a valve body 36 that opens and closes the opening 35 of the main steam pipe 33, a valve rod 37 that is connected to the valve body 36 and opens and closes the valve body 36 by moving the valve body 36 in the vertical direction in the figure. A yoke 38 for movably supporting the valve rod 37 in the vertical direction in the drawing;
A spring 39 for urging the valve body 36 in the downward direction in the figure, that is, a direction in which the valve body 36 is closed, and a hydraulic pressure supplied from the outside through an inlet 40 pulls the valve rod 37 upward in the figure, that is, the valve. It is composed of a hydraulic cylinder 41 that gives a pulling force to the main body 36 in the opening direction.

With respect to such a safety valve 34,
A portable automatic pump device 42 and a portable measuring device 43 are provided. Of these, the portable automatic pump device 42
Is a high-pressure hose 44, one end of which is removable from the inlet 40 of the safety valve 34, an electric hydraulic pump 45 for generating hydraulic pressure in the hydraulic cylinder 41 via the high-pressure hose 44, and this electric hydraulic pressure. A hydraulic pressure transducer 46 for measuring the hydraulic pressure generated by the pump 45,
The electric hydraulic pump 4 can be operated by setting the pressure from the outside.
The hydraulic pressure adjusting manual valve 47 for setting the upper limit of the hydraulic pressure generated in 5 and the hydraulic pressure generating in the electric hydraulic pump 45 are increased at a constant increase rate until the pressure setting in the hydraulic adjusting manual valve 47 is reached. Pulsation prevention needle adjusting valve 48 to be controlled so as to be controlled, a solenoid valve 49 and an accumulator 50 for finely adjusting the output hydraulic pressure, and a connection for deriving the measured value of the hydraulic pressure by the hydraulic pressure transducer 46 to the outside. It has a terminal 51 and a connection terminal 52 for giving an operation stop signal to the electric hydraulic pump 45.

The portable measuring device 43 is supplied to the connection terminal 53 and the connection terminal 53 to which the measured value of the hydraulic pressure by the hydraulic pressure transducer 46 led to the outside through the connection terminal 51 is input. And a peak hold circuit 55 for detecting and holding the maximum value of the hydraulic pressure measurement value supplied to the connection terminal 53, and a recorder 54 for holding the measured value of the hydraulic pressure. A digital display 56 for digitally displaying the hold value, and a deviation alarm setter 57 for detecting a deviation between the maximum value of the hydraulic pressure measured value held in the peak hold circuit 55 and the hydraulic pressure measured value supplied to the connection terminal 53. , A relay 58 that is driven based on the deviation detected by the deviation alarm setter 57 to generate an operation stop signal to be given to the electric hydraulic pump 45. , And a connection terminal 59 for deriving an operation stop signal output from the relay 58 to the outside.

When conducting an operation test of the safety valve 34, first, one end of the high pressure hose 44 is connected to the safety valve 3
4 and the connection terminals 51 and 52 of the portable automatic pump device 42 and the connection terminals 53 and 59 of the portable measuring device 43 are connected by cables 60 and 61, respectively. Then, the hydraulic pressure adjusting manual valve 47 is operated to set the hydraulic pressure applied to the hydraulic cylinder 41, and then the electric hydraulic pump 45 is driven.

Then, the hydraulic pressure in the hydraulic cylinder 41 is sequentially increased at a constant rate of increase, and the hydraulic pressure at this time is measured by the hydraulic pressure transducer 46 one by one, and the measured value is connected via the connection terminals 51, 53. It is recorded in the recorder 54. Then, when the valve body 36 of the safety valve 40 is opened, the hydraulic pressure in the hydraulic cylinder 41 is slightly decreased. Therefore, the operation of the safety valve 34 is detected, and immediately before the hydraulic pressure in the hydraulic cylinder 41 is decreased. , That is, valve
The hydraulic pressure measurement value immediately before opening the main body 36 is held in the peak hold circuit 55 as the hydraulic pressure in the hydraulic cylinder 41 when the safety valve 34 is operated, and the digital display 5
6 is displayed digitally.

When the safety valve 34 is activated, the deviation alarm setter 57 detects the deviation between the maximum value of the hydraulic pressure held in the peak hold circuit 55 and the lowered hydraulic pressure measurement value, and the relay 58 is driven. Since the operation stop signal is supplied to the electric hydraulic pump 45 via the connection terminal 59, the cable 61 and the connection terminal 52, the operation of the electric hydraulic pump 45 is stopped and the hydraulic pressure is supplied to the inlet 40 of the safety valve 34. Hydraulic cylinder 41
The inside is depressurized, and the operation test of the safety valve 34 is performed there.

Here, the portable automatic pump device 42 is used.
2 has a substantially box-like configuration as shown in FIG. 2, and a front panel 62 thereof has switches 63, 64 for starting and stopping the operation.
And a rotary operator 65 for setting the hydraulic pressure.
, A precision pressure indicator 66 that supports the measured value of the hydraulic pressure transducer 46, and a power switch 67 are arranged, and a connector section 69 including the connection terminals 51 and 52 is arranged on the side panel 68. Hose 44
Has been extended. The height of the portable automatic pump device 42 is 450 m when viewed from the front panel 62.
m, width 300 mm, depth 400 mm.

The portable measuring device 43 is formed in a substantially box shape as shown in FIG.
A display surface 71 of the digital display 56, a display surface 72 of the recorder 54, a display content reset switch 73, and a power switch 74 are arranged, and a side panel 75 includes a connector portion including the connection terminals 53 and 59. 76 are arranged. The portable measuring device 43 is designed to have a height of 410 mm, a width of 200 mm, and a depth of 300 mm when viewed from the front panel 70.

Therefore, according to the configuration of the above embodiment, the inlet 40 of the safety valve 34 is supplied until the hydraulic pressure in the hydraulic cylinder 41 of the safety valve 34 reaches the set pressure by performing the pressure setting operation. A portable automatic pump device 42 that automatically injects hydraulic pressure via a removable high-pressure hose 44, and detects fluctuations in hydraulic pressure in the high-pressure hose 44 due to opening of the valve body 36 of the safety valve 34. A portable measuring device 43 for measuring and recording the hydraulic pressure in the hydraulic cylinder 41 immediately before opening the valve body 36.
Since it is equipped with and, it is small and lightweight, can be easily attached to and detached from the safety valve 34, is easy to handle, and can obtain highly accurate test results. Also, the valve body 36 is opened
Since it is detected by detecting the change in the hydraulic pressure in the high pressure hose 44, it is not necessary to provide a valve stem pulling load cell on the safety valve as in the conventional case, and the structure can be simplified. It can be economically advantageous. The present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the scope of the invention.

[0029]

As described above in detail, according to the present invention,
Compact and lightweight, easily attachable to and detachable from the safety valve, easy to handle, highly accurate test results can be obtained, and an extremely good safety valve operation test device that simplifies the configuration and is economically advantageous is provided. can do.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a safety valve operation test device according to the present invention.

FIG. 2 is an external view showing a portable automatic pump device of the same embodiment.

FIG. 3 is an external view showing a portable measuring device according to the same embodiment.

FIG. 4 is a block diagram showing a conventional safety valve operation test device.

[Explanation of symbols]

11 ... Main steam pipe, 12 ... Valve body, 13 ... Valve rod, 14 ... Yoke, 15 ... Spring, 16 ... Detection part, 17 ... Safety valve, 18 ... Hydraulic pressure transducer, 19 ... Hydraulic jack, 20 ... Valve rod pull-up Load load cell, 21 ... Hydraulic control device, 22 ... Control device, 23 ... Hydraulic pump, 24 ... Regulator, 25 ... Relief valve, 26 ... Electromagnetic valve, 27 ... Hydraulic device, 28 ... Electromagnetic valve, 29 ... Hydraulic control panel, 30 ... Steam pressure transducer, 31 ... Data collection device, 32 ...
Processing unit, 33 ... Main steam pipe, 34 ... Safety valve, 35 ...
Opening, 36 ... Valve main body, 37 ... Valve rod, 38 ... Yoke, 3
9 ... Spring, 40 ... Inlet, 41 ... Hydraulic cylinder,
42 ... Portable automatic pump device, 43 ... Portable measuring device,
44 ... High pressure hose, 45 ... Electric hydraulic pump, 46 ... Hydraulic pressure transducer, 47 ... Hydraulic adjustment manual valve, 48
... pulsation prevention needle manual valve, 49 ... solenoid valve, 50 ... accumulator, 51-53 ... connection terminal, 54 ... recorder, 5
5 ... Peak hold circuit, 56 ... Digital display, 57
... Deviation alarm setter, 58 ... Relay, 59 ... Connection terminal, 60, 61 ... Cable, 62 ... Front panel, 63,
64 ... Switch, 65 ... Rotation operator, 66 ... Precision pressure indicator, 67 ... Power switch, 68 ... Side panel, 69 ...
Connector part, 70 ... Front panel, 71, 72 ... Display surface,
73 ... Reset switch, 74 ... Power switch, 75 ...
Side panel, 76 ... Connector part.

Claims (1)

(57) [Claims] 1. A pressure fluid accumulator is installed in the accumulator, and when the fluid pressure in the accumulator exceeds a specified value, the valve body opens a part of the accumulator to increase the fluid pressure in the accumulator. And has a cylinder that applies pressure in the opening direction to the valve body by injecting a pressure fluid from an inlet opening to the outside, and from the inlet when performing an operation test of the valve body. A safety valve operation test device configured to open the valve body even when the fluid pressure in the pressure accumulator is less than a specified value by injecting pressure fluid into the cylinder. It has a flexible hose-shaped member,
A portable automatic pump device for automatically injecting a pressure fluid into the inlet of the safety valve via the hose-like member until the fluid pressure in the cylinder of the safety valve reaches a set pressure by performing a pressure setting operation. And a recorder for recording the fluid pressure in the hose-shaped member of the portable automatic pump device, wherein the safety valve is in a state where pressure fluid is being injected into the inlet of the safety valve by the portable automatic pump device. Of the fluid pressure in the hose-shaped member due to the opening of the valve main body, the pressure in the cylinder immediately before the opening of the valve main body is measured and recorded, and the portable automatic pump device is used. A safety valve actuation test, comprising: a portable measuring device for stopping the supply of the pressure fluid to the inlet of the safety valve to reduce the pressure in the cylinder. Device.