KR20180101898A - Valve leakage test equipment - Google Patents

Abstract

An object of the present invention is to provide a valve leakage test device simultaneously testing leakage from the inside of a valve body of a test target valve and evaluating the integrity of a solenoid valve operating the test target valve. The present invention relates to a valve leakage test device. The valve leakage test device, which tests test object valve leakage, includes a valve body having an inlet port and a discharge port, a piston member moved by air pressure to connect or disconnect the inlet port and the discharge port and accommodated in the valve body, a solenoid valve connected to the valve body for communication or blocking of an air supply line providing the air pressure for the piston member. The valve leakage test device includes a fluid supply unit connected to the inlet port so that a fluid testing leakage of the test object valve is supplied to the inlet port, a fluid discharge unit connected to the discharge port and discharging the fluid, a first pressure measurement unit connected to the fluid discharge unit in order to check leakage between the piston member and the valve body by measuring the pressure of the fluid discharged to the fluid discharge unit, and a second pressure measurement unit connected to the solenoid valve in order to check leakage of the solenoid valve.

Description

[0001] VALVE LEAKAGE TEST EQUIPMENT [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a leakage testing apparatus for a valve, and more particularly, to a leakage testing apparatus for a valve for ensuring soundness by checking leakage of a valve used in a power plant.

A valve used in a power plant is a device used to control the flow of fluids and to operate the equipment. A leakage test is conducted periodically for soundness evaluation to ensure efficiency and safety of operation.

In particular, the emergency diesel generator of a nuclear power plant is an important safety system for supplying the snow power required to safely shut down the nuclear power plant when the external power system of the nuclear power plant is out of power. Therefore, an admission valve used for the operation of the emergency diesel generator It is important to accurately measure the leakage of the valve to ensure soundness.

According to the leakage test method of the conventional valve, it is difficult to check the leakage of the valve seat from the inside of the valve, and it is difficult to test the leakage of the solenoid valve.

In addition, in the valve leakage test, since the test is performed at the floor of the work site without any additional equipment, it is difficult to install the test apparatus on the valve without damaging the apparatus. In the leakage test, There is a problem that a maintenance person is exposed to a safety accident.

SUMMARY OF THE INVENTION The present invention provides a valve leakage test apparatus for testing whether or not a valve to be tested leaks into a valve body and evaluating the integrity of a solenoid valve that operates the valve to be tested at the same time .

Another object of the present invention is to provide a valve leakage test apparatus for accurately measuring a leak test of a valve under test to secure the integrity of the valve under test and to improve the reliability of maintenance.

Another object of the present invention is to provide a leakage test device for a valve which prevents damage to the device by using a suitable device and ensures the safety of the operator from the fluid discharged at a high pressure do.

In order to achieve the above object, a leakage test apparatus for a valve according to the present invention comprises: a valve body having an inlet port and a discharge port; a valve body movable by air pressure to connect or disconnect the inlet port and the discharge port, And a solenoid valve connected to the valve body so as to communicate or close an air supply line for supplying air pressure to the piston member, the leak test apparatus for a valve for testing leakage of a valve under test, A fluid discharge portion connected to the discharge port and configured to discharge a fluid; a fluid discharge portion connected to the discharge port to discharge fluid to be tested, So as to confirm whether or not leakage between the piston member and the valve body has occurred, It includes a first pressure measuring unit connected to the unit, to determine whether there is any leak from the solenoid valve, a second pressure measurement is connected to the solenoid valve.

Preferably, the valve body has an internal flow path connecting the inlet port and the discharge port, and a step protruded on the internal flow path, wherein the piston member includes a valve seat And the first pressure measuring unit may be provided to check whether leakage occurs between the valve seat and the stepped portion when the piston member blocks the internal flow path.

Preferably, the valve to be tested further includes a first cover coupled to the valve body and having a first receiving groove for receiving the upper end of the piston member, and a second receiving groove for receiving the lower end of the piston member The piston member includes a first seal ring fitted to the outer circumferential surface of the upper end so as to be in close contact with the first receiving groove and a second seal ring fitted to the outer circumferential surface of the lower end so as to be in close contact with the second receiving groove, Wherein the first pressure measuring portion is configured to measure a pressure difference between the first sealing groove and the first sealing ring and between the second sealing groove and the second sealing ring when the piston member blocks the internal flow passage, Or the like.

Preferably, the valve to be tested may include a first accommodating groove in which the upper end of the piston member is accommodated, and a first cover having an air inlet formed therein to communicate with the first accommodating groove, Wherein the first pressure measuring unit includes a supply port connected to the inlet port, an inlet port connected to the air supply line, and an exhaust port exhausting the air inside the solenoid valve, So as to check whether the solenoid valve is leaked or not.

Preferably, the apparatus further includes a base frame provided with a support base for supporting the valve to be tested on an upper surface thereof and a fixing member coupled to a lower surface thereof, wherein the fixing member fixes the base frame to a ground surface, .

Preferably, the apparatus further includes a base frame provided on the upper side with a support for supporting the valve to be tested, a vertical frame vertically coupled to the base frame and provided on a side where the fluid discharge part is disposed, And a plate-shaped safety plate mounted on the vertical frame so as to collide with the fluid and spaced apart from the fluid discharge unit at a position corresponding to the fluid discharge unit.

Preferably, the silencer may further include a silencer coupled to the fluid discharge unit to attenuate noise generated when the fluid is discharged from the discharge port to the high-pressure fluid.

As described above, by using the leakage test apparatus for a valve according to the present invention, it is possible to test whether the valve seat of the valve to be tested, the first sealing ring and the second sealing ring are leaked, And an excellent effect of evaluating the integrity together can be obtained.

Therefore, according to the present invention, since the leakage test of the valve under test can be accurately measured, the integrity of the valve under test can be ensured and the maintenance reliability can be improved. For example, when the valve under test is used in an emergency diesel generator of a nuclear power plant, maintenance reliability can be ensured to enable the emergency diesel generator to start quickly in the event of a major accident.

In addition, according to the present invention, since the test subject valve can be stably fixed to the test site without being shaken by the fixing member, the accuracy of the test can be enhanced and damage to the device can be prevented.

In addition, according to the present invention, since the safety plate blocks the high-pressure discharge air discharged from the fluid discharge portion, the operator can be prevented from being exposed to a safety accident, and the peripheral device can be safely protected.

1 is a perspective view showing a valve leakage test apparatus according to an embodiment of the present invention.
2 is a front view showing a valve leakage test apparatus according to an embodiment of the present invention.
3 is a left side view showing the left side of Fig.
4 is a partial cross-sectional view showing the operation of the leakage test apparatus in a closed state of the valve to be tested.
5 is a partial cross-sectional view showing the operation of the leakage test apparatus in a state in which the valve to be tested is opened.
6 is a perspective view showing an example of a piston member applied to a valve to be tested.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the embodiments described below are embodiments suitable for understanding the technical characteristics of the leak test apparatus for a valve of the present invention. However, the technical features of the present invention are not limited by the embodiments to which the present invention is applied or explained in the following embodiments, and various modifications are possible within the technical scope of the present invention.

As in the embodiment shown in Fig. 1, the leakage test device for a valve 100 according to the present invention is based on testing whether or not the valve 10 to be tested leaks. The valve 10 to be tested to which the present invention is applied may be a valve that controls the flow of fluid (gas or liquid) and may be, for example, an admission valve used for the operation of an emergency diesel generator of a nuclear power plant . However, the object to be tested by the present invention is not limited to valves used in such an emergency diesel generator.

4 to 6, a valve body 20, a piston member 30, a solenoid valve 40, and a solenoid valve 40 are provided in the valve body 10, .

The valve body (20) has an inlet (21) and a discharge port (22). The valve body 20 includes an internal flow passage 23 connecting the inlet 21 and the discharge opening 22 and serving as a passage for air and has a step 25 protruding in a ring shape on the internal flow passage 23, .

The piston member 30 is moved by air pressure and is accommodated in the valve body 20 by connecting or disconnecting the inlet 21 and the outlet 22. Specifically, the piston member 30 can be provided so as to be movable up and down, and can be disposed on the inner flow path 23. The piston member 30 may be composed of an upper rod portion 31 and a lower disk portion 35. [ Air pressure may be applied to the upper surface 31a of the rod portion 31. [ The disc portion 35 is provided with a valve seat 37 which is in contact with the step 25 of the inner flow path 23 to seal the inner flow path 23 38 may be provided. The spring accommodation space 38 is provided with a spring 39 and the spring 39 can restore the position by moving the piston member 30 upward.

The solenoid valve 40 may be connected to the valve body 20 to communicate or close an air supply line 70 that provides air pressure to the piston member 30. For example, the solenoid valve 40 may include an inlet port 41, a supply port 42, and an exhaust port 43. The inlet port 41 is connected to the air supply line 70 to introduce air into the solenoid valve 40. The supply port 42 supplies the introduced air to the valve body 20 and the exhaust port 43, The air in the solenoid valve 40 can be exhausted. Here, the air supply line 70 may be connected to the inlet port 41 of the solenoid valve 40 at one side and to the inlet port 21 at the other side. A part of the air flowing into the inlet 21 flows into the solenoid valve 40 through the air supply line 70 to provide the air pressure for moving the piston member 30. [ Reference numeral 71 denotes an opening / closing valve for opening / closing the air supply line 70.

The valve 10 to be tested includes a first cover 50 coupled to the valve body 20 and formed with a first receiving groove 51 for receiving the upper end of the piston member 30, And a second cover 60 having a second receiving groove 61 for receiving a lower end of the first cover 30. Here, the first cover 50 may be formed with an air inlet 53 communicating with the first receiving groove 51. The piston member 30 has a first sealing ring 32 fitted to the outer circumferential surface of the upper end so as to come into close contact with the first receiving groove 51 and a second sealing ring 32 fitted to the outer circumferential surface of the lower end And may include a second sealing ring 36. Here, the first sealing ring 32 and the second sealing ring 36 may be, for example, an O-ring, but are not limited thereto.

The valve 10 to be tested is not limited to the valve described above and includes a piston member 30 accommodated in the valve body 20 and a solenoid valve 30 for controlling the operation of the piston member 30 40, various types of valves may be applied.

1 to 4, a valve leakage test apparatus 100 according to an embodiment of the present invention includes a fluid supply unit 200, a fluid discharge unit 300, a first pressure measurement unit 400, And a second pressure measuring unit 500.

The fluid supply part 200 can be connected to the inlet 21 so as to supply the fluid for testing the leakage of the valve 10 to be tested to the inlet 21. The fluid supply unit 200 includes a first flange 210 for sealing the inlet 21, a fluid supply line 220 installed in the first flange 210 to communicate with the inlet 21, And an opening / closing valve 230 for opening and closing the line 220. Reference numeral 211 denotes a sealing member for sealing between the valve body 20 and the first flange 210.

The fluid discharge portion 300 is connected to the discharge port 22 to discharge the fluid. The fluid discharge portion 300 includes a second flange 310 for sealing the discharge port 22, a fluid discharge line 320 provided in the second flange 310 so as to communicate with the discharge port 22, And an open / close valve 330 for opening and closing the discharge line 320. A reference numeral 311 denotes a sealing member sealing between the valve body 20 and the second flange 310.

The first pressure measuring unit 400 may measure the pressure of the fluid discharged to the fluid discharging unit 300 and measure the pressure of the fluid discharged from the fluid discharging unit 300 to check the leakage between the piston member 30 and the valve body 20. [ Lt; / RTI >

Specifically, the first pressure measuring unit 400 may be connected to the pipe branching at the fluid discharge line 320 to measure the pressure of the fluid flowing through the fluid discharge line 320. The first pressure measuring part 400 measures the pressure of the fluid discharge line 320 when the internal flow path 23 of the valve 10 to be tested is shut off so that the fluid is discharged to the discharge port 22 It can be confirmed whether it is leaked. Accordingly, the first pressure measuring part 400 can check whether or not leakage between the piston member 30 and the valve body 20 has occurred.

The second pressure measuring unit 500 may be connected to the solenoid valve 40 to check whether the solenoid valve 40 is leaked or not.

Specifically, the second pressure measuring part 500 may be connected to the exhaust port 43 of the solenoid valve 40. When the inlet port 41 and the supply port 42 of the solenoid valve 40 are connected so that the air in the air supply line 70 flows into the valve body 20, Can be measured. Accordingly, the second pressure measuring unit 500 can check the integrity of the solenoid valve 40 by checking whether the fluid leaks to the solenoid valve 40 and the amount of the leaked fluid.

The type of the first pressure measuring part 400 and the second pressure measuring part 500 is not limited and if the pressure of the fluid leaking to the fluid discharge line 320 and the exhaust port 43 can be measured, And the like can be applied without limitation.

As described above, by using the leakage test device for a valve according to the present invention, it is possible to test whether the valve seat inside the valve to be tested, the first sealing ring and the second sealing ring are leaked, It is possible to obtain an excellent effect of evaluating the soundness of the article.

Accordingly, the present invention can accurately measure the leakage test of the valve to be tested, so that the integrity of the valve to be tested can be secured and the maintenance reliability can be improved. For example, when the valve under test is used in an emergency diesel generator of a nuclear power plant, maintenance reliability can be ensured to enable the emergency diesel generator to start quickly in the event of a major accident.

More specifically, the first pressure measuring part 400 is provided to check whether the piston member 30 is leaking between the valve seat 37 and the step 25 when the internal flow path 23 is blocked . 4, when the air pressure is not applied to the inside of the valve body 20 by the operation of the solenoid valve 40, the piston member 30 is raised and the piston member 30 The stepped portion 25 provided on the valve body 20 is seated on the valve seat 37 on the valve seat 37 so that the internal flow path 23 can be shut off.

In this case, when the pressure of the fluid is sensed by the first pressure measuring unit 400, it is possible to confirm whether or not the leakage between the valve seat 37 and the step 25 is leaked.

The first pressure measuring part 400 is provided between the first receiving groove 51 and the first sealing ring 32 and between the first receiving groove 51 and the second receiving groove 32 when the piston member 30 blocks the inner flow passage 23. [ 61) and the second sealing ring (36).

The space between the upper end portion of the piston member 30 and the first receiving groove 51 can be sealed by the first sealing ring 32 and the space between the lower end portion of the piston member 30 and the second receiving groove 61, And can be sealed by the second sealing ring 36. Therefore, leakage may occur between the piston member 30 and the valve body 20 if the sealing is not smooth due to the damage of the first sealing ring 32 and the second sealing ring 36. [ The first pressure measuring unit 400 can check whether the first sealing ring 32 and the second sealing ring 36 leak.

1 to 3, the leakage testing apparatus 100 for a valve according to the present invention further includes a base frame 610. The base frame 610 is provided with a support table 611 for supporting the valve 10 to be tested on its upper surface and a fixing member 615 can be coupled to the lower surface thereof.

Specifically, the base frame 610 may be a base for supporting the valve 10 to be tested, and a wheel 613 may be mounted on the lower surface of the base frame 610 to facilitate movement thereof.

The fixing member 615 can fix the base frame 610 to the paper surface before the test subject valve 10 is installed after moving to the test site. The fixing member 615 is coupled to the lower surface of the base frame 610 and can be vertically and retractably provided. For example, the fixing member 615 is provided with the adjusting bolt 616, It can be stretched. Accordingly, when moving the base frame 610, the adjustment bolt 616 can be tightened so that the lower end of the fixing member 615 does not touch the ground. When the base frame 610 is fixed, the adjustment bolt 616 The base frame 610 can be fixed by adjusting the lower end of the fixing member 615 to touch the ground. However, the shape and fixing manner of the fixing member 615 are not limited to the illustrated one, and various modifications can be made if the base frame 610 can be fixed to the ground.

With this fixing member 615, the valve 10 to be tested can be stably fixed to the test site without being shaken, so that the accuracy of the leakage test can be enhanced.

Meanwhile, the valve leakage test apparatus 100 may further include a vertical frame 630 and a safety plate 633.

The vertical frame 630 may be vertically coupled to the base frame 610 and may be provided on a side where the fluid discharge portion 300 is disposed. The vertical frame 630 may be provided with a handle 631 to facilitate the movement of the base frame 610.

The safety plate 633 may be provided in a plate shape and may be mounted on the vertical frame 630. Further, the fluid outlet 300 may be spaced apart from and adjacent to the fluid outlet 300 so as to collide with the fluid discharged from the fluid outlet 300.

Accordingly, since the safety plate 633 blocks the high-pressure discharge air discharged from the fluid discharge part 300, it is possible to prevent the operator from being exposed to a safety accident and safely protect the peripheral device.

On the other hand, the valve leakage test apparatus 100 may further include a silencer 350.

The muffler 350 may be coupled to the fluid outlet 300 and more specifically may be coupled to the fluid outlet line 320 to dampen the noise generated when the high pressure fluid is discharged from the outlet 22 . Thereby, it is possible to prevent the operator from being exposed to the safety accident due to the high noise in the safety accident.

Hereinafter, the operation of the leakage test device for a valve 100 according to the present invention will be described with reference to FIGS. 1 to 5. FIG.

The leakage test apparatus 100 for a valve may be moved to a test site and the adjustment bolt 616 of the fixing member 615 may be adjusted to fix the base frame 610 to the ground.

The valve 10 to be tested may be installed on the support frame 611 of the base frame 610 and the fluid supply part 200 and the fluid discharge part 300 may be connected to the valve body 20. A first pressure measuring part 400 is installed on the fluid discharge part 300 and a second pressure measuring part 500 is installed on the solenoid valve 40.

4, the open / close valve 71 of the air supply line 70 is closed and the open / close valve 230 connected to the fluid supply line 220 is opened to supply the test fluid to the valve body 20, To the inlet (21)

At this time, the piston member 30 is lifted, and the valve seat 37 and the step 25 of the internal flow passage 23 come into close contact with each other to cut off the internal flow passage 23. The space between the upper end of the piston member 30 and the first receiving groove 51 can be sealed by the first sealing ring 32 and the space between the lower end of the piston member 30 and the second receiving groove 61 Can be sealed by the second sealing ring (36).

If the first pressure measuring part 400 is confirmed while the fluid is supplied to the fluid supply line 220 while the internal flow path 23 is closed as described above, You can check if it is leaked. Thus, the integrity of the valve seat 37, the sealing force of the first sealing ring 32 and the second sealing ring 36, and the soundness of the driving performance of the piston member 30 can be evaluated.

5, the open / close valve 71 of the air supply line 70 is opened and the open / close valve 230 connected to the fluid supply line 220 is opened to connect the test fluid to the valve body 20, To the inlet port 21 of the solenoid valve 40 and to the inlet port 41 of the solenoid valve 40.

At this time, the inlet port 41 and the supply port 42 of the solenoid valve 40 are connected to each other to connect the first receiving groove 51 and the upper surface 31a of the piston member 30 through the air inlet 53 Air can be introduced. The introduced air provides air pressure to the upper surface 31a of the piston member 30, and the piston member 30 is lowered by the air pressure. As the piston member 30 descends, the valve seat 37 and the step 25 are separated from each other and the internal flow passage 23 is communicated.

If the second pressure measuring unit 500 is confirmed in a state where the air is supplied through the air supply line 70 as described above, it is possible to confirm whether or not the solenoid valve 40 is leaked. Specifically, by measuring the pressure of the fluid leaked through the exhaust port 43 in the second pressure measuring unit 500, it is possible to confirm whether the solenoid valve 40 is malfunctioning or leaking. At this time, if there is no leakage, the solenoid valve 40 can be tested while operating the solenoid valve 40 to confirm the pressure change of the second pressure measuring part 500.

As described above, by using the leakage test apparatus for a valve according to the present invention, it is possible to test whether the valve seat of the valve to be tested, the first sealing ring and the second sealing ring are leaked, And an excellent effect of evaluating the integrity together can be obtained. Therefore, according to the present invention, since the leakage test of the valve under test can be accurately measured, the integrity of the valve under test can be ensured and the maintenance reliability can be improved.

Further, according to the present invention, since the test subject valve can be stably fixed to the test place without being shaken by the fixing member, the accuracy of the test can be increased. Further, since the safety plate blocks the high-pressure discharge air discharged from the fluid discharging portion, it is possible to prevent the operator from being exposed to a safety accident, and to safely protect the peripheral device.

While the invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made without departing from the scope of the present invention.

10: Test valve 20: Valve body
21: inlet 22: outlet
23: inner flow path 25: step
30: piston member 31: rod member
31a : upper surface 32 : first sealing ring
35 : disk portion 36: second sealing ring
37: valve seat 40: solenoid valve
41: inlet port 42: supply port
43: exhaust port 50: first cover
51: first receiving groove 53: air inlet
60: second cover 61: second receiving groove
70: air supply line
100: Leakage test device for valve 200: Fluid supply part
210: first flange 220: fluid supply line
300: fluid discharge part 310: second flange
320: fluid discharge line 350: silencer
400: first pressure measuring part 500: second pressure measuring part
610: Base frame 611 : Support
615 : Fixing member 616 : Adjusting bolt
630 : vertical frame 633 :

Claims (7)

A valve body having an inlet port and a discharge port; a piston member which is moved by air pressure to connect or disconnect the inlet port and the discharge port and is accommodated in the valve body; and an air supply line for supplying air pressure to the piston member, Or a solenoid valve connected to the valve body so as to close the valve body,
A fluid supply unit connected to the inlet to supply a fluid for testing leakage of the valve to be tested to the inlet;
A fluid discharge unit connected to the discharge port to discharge the fluid;
A first pressure measuring unit connected to the fluid discharging unit to measure a pressure of fluid discharged to the fluid discharging unit to check whether leakage occurs between the piston member and the valve body; And
And a second pressure measuring unit connected to the solenoid valve to check whether or not the solenoid valve is leaked. The method according to claim 1,
Wherein the valve body has an inner flow path connecting the inlet and the outlet, and a step formed on the inner flow path,
Wherein the piston member has a valve seat on which the step is seated to block the internal flow path,
Wherein the first pressure measuring unit is provided to check whether or not the leakage between the valve seat and the step is leaked when the piston member blocks the internal flow path. 3. The method of claim 2,
Wherein the valve to be tested comprises a first cover coupled to the valve body and having a first receiving groove in which the upper end of the piston member is received and a second cover having a second receiving groove in which the lower end of the piston member is received, Lt; / RTI >
Wherein the piston member includes a first sealing ring fitted to the outer peripheral surface of the upper end so as to be in close contact with the first receiving groove and a second sealing ring fitted to the outer peripheral surface of the lower end so as to be in close contact with the second receiving groove,
The first pressure measuring unit may check whether leakage occurs between the first housing groove and the first sealing ring and between the second housing groove and the second sealing ring when the piston member blocks the internal flow passage Wherein the valve is provided with a valve body. The method according to claim 1,
Wherein the valve to be tested comprises a first accommodating groove in which an upper end portion of the piston member is accommodated and a first cover in which an air inlet port communicates with the first accommodating groove,
Wherein the solenoid valve includes a supply port connected to the air inlet, an inlet port connected to the air supply line, and an exhaust port for exhausting air inside the solenoid valve,
And the second pressure measuring unit is connected to the exhaust port so as to measure the pressure of the fluid discharged to the exhaust port to check whether the solenoid valve is leaked. The method according to claim 1,
Further comprising: a base frame having a support base for supporting the valve to be tested on an upper side thereof and a fixing member being coupled to a lower side thereof,
Wherein the fixing member is provided so that the base frame is fixed to the ground and is vertically stretchable and shrinkable. The method according to claim 1,
A base frame on the upper side on which a support base for supporting the test subject valve is installed;
A vertical frame coupled to the base frame, the vertical frame being disposed on a side where the fluid discharge portion is disposed; And
And a plate-shaped safety plate mounted on the vertical frame so as to collide with the fluid discharged from the fluid discharge portion and spaced from the fluid discharge portion at a position corresponding to the fluid discharge portion, . The method according to claim 1,
Further comprising a silencer coupled to the fluid discharge portion to attenuate noise generated when the fluid is discharged to the high-pressure fluid at the discharge port.

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