KR101930423B1 - Apparatus for testing water hammering on check valve - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a check valve watertightness test apparatus, including a pump, a pressure tank, a check valve, a reservoir, a first opening / closing valve, The pump pressurizes the test fluid. The pressure tank is fluidly connected with the pump through the first flow path, and the test fluid which is pressurized from the pump and passed through the first flow path is stored. The check valve is installed between the pump and the pressure tank on the first flow path, and causes the test fluid pressurized by the pump to flow toward the pressure tank side. The reservoir stores the test fluid supplied to the pump side. The first on-off valve is provided on a second flow path branched from the first flow path and connecting the outlet port of the check valve and the reservoir, and selectively opens and closes the second flow path. When the test fluid is filled in the pressure tank, the control unit opens the second flow path to discharge a part of the test fluid to the reservoir through the second flow path while transferring the remaining part of the test fluid to the pressure tank through the first flow path, When the valve is subjected to the water hammer test, the second flow path is closed to control the first opening / closing valve so that the test fluid filled in the pressure tank impacts the check valve through the first flow path.

Description

[0001] Apparatus for testing water hammer on check valve [0002]

The present invention relates to a check valve water hammer test apparatus, and more particularly, to a check valve water hammer test apparatus capable of performing a water hammer test to verify the quality of a check valve installed in a fluid pipe without using a large flow path.

In general, valves have been used to control fluid flow from a very long time ago, and they regulate the pressure, direction and velocity, or flow, expressed in physical properties of the fluid. Valves are the most common and important control element that controls the flow of fluid in the final stages of each control step to match the fluidic physical conditions and amounts of fluid required by each process in the fluid line.

Among the various kinds of valves for controlling the fluid flow in the fluid channel, the check valve is a valve that operates to flow the fluid only in one direction and to close in the opposite direction to prevent reverse flow of the fluid, It can be divided into lift check valve, swing check valve, disc check valve, butterfly check valve and ball check valve in the structure principle.

In practical use, in a large fluid pipe such as a water pipe, a check valve, which is a check valve, is installed so that the fluid discharged from the pump does not flow back again.

However, if a failure or electric power failure occurs in the electric motor driving the pump, the fluid advances due to the inertia in the large fluid pipe, and the check valve closes while flowing backward toward the check valve. In this case, A large impact pressure is applied to the check valve, resulting in so-called water hammering.

That is, when the valve is suddenly opened and closed in a pipeline through which a fluid such as water flows, the hydraulic pressure and the flow velocity in the pipeline suddenly change instantaneously and the force (F = m * a) , The pressure is greatly raised and lowered, and the generated pressure wave reciprocates between the upstream and downstream ends, causing a water hammer such as vibrating the pipe or causing noise. As a result, May be repeatedly impacted or abraded to shorten the service life, and in the worst case, it may break the pipeline or cause a dangerous situation to the auxiliary facilities such as the pump and the motor.

Therefore, in order to verify the quality of the check valve, a water hammer test is indispensable to determine the degree of impact pressure to withstand. However, it is practically impossible to obtain a waterway to test it, and even if a large waterway is available to test it, impacts on the waterway during the water hammer test may cause damage to pumps, motors, there is a problem.

Korean Registered Patent No. 10-1390884 (Registered on Apr. 24, 2014, entitled: check valve backflow test apparatus and method)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a test system, Which is capable of simulating a substantial water hammer phenomenon with respect to a check valve without using a large water channel.

According to an aspect of the present invention, there is provided an apparatus for testing a water valve of a check valve, comprising: a pump for pressurizing a test fluid; A pressure tank fluidly connected with the pump through a first flow path and storing a test fluid which is pressurized from the pump and transferred through the first flow path; A check valve installed between the pump and the pressure tank on the first flow path and allowing the test fluid pressurized by the pump to flow to the pressure tank side; A reservoir for storing a test fluid supplied to the pump side; A first opening / closing valve provided on a second flow path branched from the first flow path and connecting the outlet port of the check valve and the reservoir, and selectively opening / closing the second flow path; A second on-off valve provided on a third flow path branched from the first flow path and connecting the pump and the reservoir, the second on-off valve selectively opening and closing the third flow path; And when the test fluid is filled in the pressure tank, the second flow path is opened to discharge a part of the test fluid to the reservoir through the second flow path while the remaining part of the test fluid flows through the first flow path, And the third flow path is closed so that all of the test fluid pressurized by the pump passes through the check valve. When the check valve is subjected to the water hammer test, the second flow path is closed, The test fluid may impinge on the check valve through the first flow path and open the third flow path to discharge all of the test fluid pressurized by the pump to the reservoir, And a control unit for controlling the valve.

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A second opening / closing valve provided on a third flow path branched from the first flow path and connecting the pump and the reservoir, the second on-off valve selectively opening / closing the third flow path; Wherein the second flow path is branched at a position between the check valve and the pressure tank in the first flow path and the third flow path is branched at a position between the pump and the check valve in the first flow path, .

The check valve watertightness test apparatus according to the present invention is characterized in that it comprises a check valve provided between the check valve and the pressure tank on the first flow path and configured to measure a pressure applied to the check valve And a sensor.

According to the check valve waterquake test apparatus of the present invention, it is possible to simulate a substantial water hammer phenomenon on a check valve without using a large water passage.

Further, according to the check valve water hammer test apparatus of the present invention, it is possible to eliminate the waiting time due to the inertia that may occur when the pump is stopped, and to quickly simulate the failure or halt of the pump.

1 is a schematic circuit diagram of an apparatus for testing a water valve of a check valve according to an embodiment of the present invention,
Fig. 2 is a view showing the flow of the test fluid when the test fluid is filled in the pressure tank in the water valve test apparatus of the check valve of Fig. 1,
3 is a view showing the flow of the test fluid when the check valve is subjected to a water hammer test in the water hammer test device of the check valve of FIG. 1,
Fig. 4 is a graph showing a change in pressure at an outlet port of a check valve of the check valve watertightness testing apparatus of Fig. 1;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a water valve test apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic circuit diagram of an apparatus for testing a check valve of a check valve according to an embodiment of the present invention. FIG. 2 is a schematic view of a check valve of FIG. FIG. 3 is a view showing a flow of a test fluid when a check valve is subjected to a water hammer test in the water hammer test apparatus of the check valve of FIG. 1, and FIG. 4 is a view showing the flow of the test water And a pressure change at an outlet port of the check valve of the apparatus.

Referring to FIGS. 1 to 4, the apparatus for testing a water-jacket of a check valve 100 according to the present embodiment can perform a water-resistance test for verifying the quality of a check valve installed in a fluid channel without using a large- A check valve 130, a reservoir 140, a first on-off valve 150, a second on-off valve 160, a pressure sensor 170 And a control unit (not shown).

The pump 110 pressurizes the test fluid f. The pump 110 is fluidly connected to the pressure tank 120 through the first flow path L1 and the test fluid f pressurized by the pump 110 is filled in the pressure tank 120 at a preset pressure .

1 to 3, the pump 100 of the present embodiment is shown as being composed of a plurality of centrifugal multi-stage pumps, but there is no limit to the number of the centrifugal multi-stage pumps, and the test fluid f such as water can be pressurized and supplied Various types of pumps can be used.

The pressure tank 120 is connected to the pump 110 through a first flow path L1 and a test fluid f which is pressurized by the pump 110 and transferred through the first flow path L1 .

The present invention does not directly use a pole channel having a length of several hundred meters as a test device for performing a water hammer test of the check valve 130 by generating a water hammer phenomenon in the check valve 130 in place of a large water channel . In this test apparatus 100, by using a pressure tank 120 having a pressure of 10 bar equivalent to a water head of about 100 m, it is possible to secure a pole equivalent channel for an effective test apparatus.

The check valve 130 is installed between the pump 110 and the pressure tank 120 on the first flow path L1 so that the test fluid f pressurized by the pump 110 flows toward the pressure tank 120 .

The check valve 130 allows the test fluid f discharged from the pump 110 to flow into the pressure tank 120. When the supply of the test fluid f from the pump 110 is blocked, (F), and various check valves may be used which require a water hammer test to verify the quality.

The reservoir 140 stores the test fluid f supplied to the pump 110 side.

2, when the test fluid f is filled in the pressure tank 120, a part of the test fluid f pressurized by the pump 110 while the second flow path L2, which will be described later, And is discharged to the reservoir 140 through the flow path L2. 3, when the check valve 130 is subjected to the water hammer test, all of the test fluid f pressurized by the pump 110 is released from the third flow path L3 while the third flow path L3, which will be described later, And is discharged to the reservoir 140.

The test fluid f discharged through the second flow path L2 and the test fluid f discharged through the third flow path L3 are stored in the reservoir 140 and the test fluid f stored in the reservoir 140 (f) may be supplied to the pump 110 side again.

The first on-off valve 150 selectively opens and closes the second flow path L2 and connects the outlet port 130b of the check valve and the reservoir 140 branched from the first flow path L1. L2.

Referring to FIG. 2, when the test fluid f is filled in the pressure tank 120, the first on-off valve 150 is opened. At this time, a part of the test fluid fressed by the pump 110 flows into the second flow path L2 while the second flow path L2 is opened and the outflow port 130b of the check valve and the reservoir 140 are fluid- And the remaining part of the test fluid f pressurized by the pump 110 is discharged through the first flow path L1 connecting the pump 110 and the pressure tank 120 to the reservoir 140 through the pressure And transferred to the tank 120.

Referring to FIG. 3, when the check valve 130 is subjected to a water hammer test, the first on-off valve 150 is closed. At this time, the second flow path L2 is closed and the flow path of the test fluid f filled in the pressure tank 120 to the reservoir 140 is blocked, and the test fluid f filled in the pressure tank 120, All of which are transmitted to the check valve 130 and apply an impact pressure to the check valve 130.

While the test fluid f pressed by the pump 110 is transferred to the pressure tank 120 and the test fluid f is filled in the pressure tank 120, the pressure in the pressure tank 120 is initially relatively low The check valve 130 can be kept open. However, when the test fluid f is continuously filled in the pressure tank 120, the pressure in the pressure tank 120 gradually rises, and the check valve 130 is not maintained in the open state and is gradually closed.

In order to properly perform the water hammer test of the check valve 130, it is preferable that the check valve 130 is opened and then the impact valve 130 is turned to the fully closed state by the reverse flow of the fluid, When the check valve 130 is gradually closed due to an increase in internal pressure in the pressure tank 120 during the filling of the pressure tank 120 as described above, the backflow of the test fluid f filled in the pressure tank 120 The impact pressure applied to the check valve 130 is relatively lowered. Therefore, the water hammer phenomenon of the check valve 130, which may occur in an actual industrial field, can not be accurately simulated.

The check valve 130 can be opened in the actual industrial field by selectively opening and closing the second flow path L2 connecting the check valve 130 and the reservoir 140 using the first on- The effect of the water hammer test can be doubled.

That is, while the test fluid f is being filled in the pressure tank 120, the first on-off valve 150 is opened so that a part of the test fluid fressed by the pump 110 flows through the second flow path L2 Even if the internal pressure in the pressure tank 120 is increased, the back pressure applied to the outlet port 130b of the check valve due to the opening of the second flow path L2 can be relatively lowered, , The check valve 130 can be kept open while the test fluid f is filled in the pressure tank 120.

Thereafter, when performing the water hammer test on the check valve 130, the first opening / closing valve 150 is closed, and at this time, the test fluid f filled in the pressure tank 120 flows back to the check valve 130 side, When the valve 130 is rapidly closed, sudden opening and closing of the check valve 130 may occur as in the case where the actual water hammer phenomenon occurs.

One end of the second flow path L2 of the present embodiment is branched on the first flow path L1 at a position between the outlet port 130b of the check valve and the pressure tank 120 and the other end is connected to the reservoir 140 .

The second on-off valve 160 selectively opens and closes the third flow path L3 and flows on the third flow path L3 branched from the first flow path L1 and connecting the pump 110 and the reservoir 140 Respectively.

Referring to FIG. 2, when the test fluid f is filled in the pressure tank 120, the second on-off valve 160 is closed. At this time, the test fluid f pressurized by the pump 110 is not discharged to the reservoir 140 while the third flow path L3 is closed, and all of the test fluid f is discharged through the first flow path L1 via the check valve 130 do.

Referring to FIG. 3, when the water hammer test is performed on the check valve 130, the second on-off valve 160 is opened. At this time, as the third flow path L3 is opened and the pump 110 and the reservoir 140 are connected, the test fluid f pressurized by the pump 110 does not flow to the check valve 130, L3. ≪ / RTI >

The pump 110 may be stopped and the failure or stop of the pump 110 may be simulated when the check valve 130 is tested for water hammer. However, in the present embodiment, the pump 110 is continuously operated, The failure of the pump 110 can be simulated by discharging the test fluid f that has been pressurized by the pump 110 using the valve 160 to the reservoir 140 without sending it to the check valve 130 .

Since the flow path connecting the pump 110 and the check valve 130 is very short, the water hammer test apparatus 100 of the present invention stops the operation of the pump 110 in order to simulate the failure or stop of the pump 110 The pressure is continuously applied to the inlet port 130a of the check valve for a predetermined time by inertia. Therefore, it is necessary to wait for a considerable period of time until the pressure applied to the inlet port 130a of the check valve substantially disappears, thereby causing a problem that the test time becomes long.

3, when performing the water hammer test on the check valve 130, instead of stopping the operation of the pump 110, the pump 110 is continuously operated and the second on-off valve 160 So that the test fluid f pressed by the pump 110 is discharged to the reservoir 140 without being transferred to the check valve 130 side.

It is possible to prevent the test fluid f pressed by the pump 110 from flowing to the check valve 130 without interrupting the operation of the pump 110, Time can be eliminated and the situation in which the pump 110 fails or stops in the actual fluid conduit and the fluid does not flow to the check valve 130 can be quickly simulated.

One end of the third flow path L3 of the present embodiment is branched on the first flow path L1 at a position between the pump 110 and the inlet port 130a of the check valve and the other end is formed to be connected to the reservoir 140 .

The pressure sensor 170 measures the pressure applied to the check valve 130 when the check valve 130 is subjected to the water hammer test and the pressure sensor 170 measures a pressure difference between the check valve 130 and the pressure tank 120 on the first flow path L1. Respectively.

4, the pressure sensor 170 is installed on the outlet port 130b side of the check valve to measure the impact pressure generated during the water hammer test. It is confirmed that when the pressure of the pressure tank 120 reaches the set pressure and the water hammer occurs, the impact pressure of about 3 to 4 times the set pressure is generated in the check valve 130. In the test apparatus 100 ) Is small as a whole, it can be confirmed that the water hammer phenomenon that may actually occur in the fluid channel can be normally simulated.

By changing the set pressure of the pressure tank 120, the impact pressure that can be measured through the pressure sensor 170 can also be changed.

The controller (not shown) controls the first on-off valve 150 and the second on-off valve 160.

Referring to FIG. 2, when the test fluid f is filled in the pressure tank 120, not only the test fluid f is filled in the pressure tank 120, but also the check valve 130 ) Is also preferably maintained in the open state.

Accordingly, the control unit opens the first open / close valve 150 to open the second flow path L2 so that a part of the test fluid f is discharged to the reservoir 140 through the second flow path L2, f to the pressure tank 120 through the first flow path L1. The check valve 130 can be kept open even if the internal pressure of the pressure tank 120 is increased by the filling of the test fluid f.

At this time, the control unit closes the second on-off valve 160 and closes the third flow path L3. Therefore, the test fluid f pressurized by the pump 110 passes through the check valve 130 through the first flow path L1 and is not discharged to the reservoir 140 through the third flow path L3.

3, when the check valve 130 is subjected to the water hammer test, the pump 110 is continuously operated without stopping the operation of the pump 110 in order to rapidly simulate the failure or stop of the pump 110. [ It is preferable to block the test fluid f that is pressurized by the pump 110 from being transferred to the check valve 130.

Accordingly, the control unit opens the second on-off valve 160 to open the third flow path L3. The test fluid f pressurized by the pump 110 is discharged to the reservoir 140 through the third flow path L3 and does not flow toward the check valve 130 side.

At this time, the control unit closes the first on-off valve 150 and closes the second flow path L2. Therefore, the test fluid f filled in the pressure tank 120 flows backward through the first flow path L1, and impact pressure is applied to the check valve 130, thereby performing the water hammer test on the check valve 130 Lt; / RTI >

The apparatus for testing the water quality of a check valve according to the present invention constructed as described above allows a part of the test fluid to be discharged to the outside while the test fluid passing through the check valve is filled in the pressure tank, The effect of simulating the actual water hammer phenomenon can be obtained.

When the check valve is subjected to the water hammer test, the apparatus for testing the water hammer of the check valve of the present invention constructed as described above discharges all of the test fluid pressurized by the pump to the reservoir while continuing to operate the pump. The waiting time due to the inertia of the pump can be eliminated, and the effect of quick simulation of the failure or stoppage of the pump can be obtained.

The scope of the present invention is not limited to the above-described embodiments and modifications, but can be implemented in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

100: Check valve water hammer test device
110: pump
120: Pressure tank
130: Check valve
140: Reservoir
150: first opening / closing valve
f: Test fluid
L1: first flow
L2:

Claims (4)

A pump for pressurizing the test fluid;
A pressure tank fluidly connected with the pump through a first flow path and storing a test fluid which is pressurized from the pump and transferred through the first flow path;
A check valve installed between the pump and the pressure tank on the first flow path and allowing the test fluid pressurized by the pump to flow to the pressure tank side;
A reservoir for storing a test fluid supplied to the pump side;
A first opening / closing valve provided on a second flow path branched from the first flow path and connecting the outlet port of the check valve and the reservoir, and selectively opening / closing the second flow path;
A second on-off valve provided on a third flow path branched from the first flow path and connecting the pump and the reservoir, the second on-off valve selectively opening and closing the third flow path; And
When the test fluid is filled in the pressure tank, the second flow path is opened to discharge a part of the test fluid to the reservoir through the second flow path while the remaining part of the test fluid flows into the pressure tank through the first flow path And the third flow path is closed to allow all of the test fluid pressurized by the pump to pass through the check valve. When the check valve is subjected to the water hammer test, the second flow path is closed and the test Closing valve and the second open / close valve so as to cause the fluid to impact the check valve through the first flow path, to open the third flow path, and to discharge all of the test fluid pressurized by the pump to the reservoir, And a control unit for controlling the water hammer of the check valve. delete The method according to claim 1,
And a second on-off valve provided on a third flow path branched from the first flow path and connecting the pump and the reservoir, the second on-off valve selectively opening and closing the third flow path,
The second flow path branches at a position between the check valve and the pressure tank in the first flow path,
And the third flow path is branched at a position between the pump and the check valve in the first flow path. The method according to claim 1,
And a pressure sensor installed between the check valve and the pressure tank on the first flow path for measuring a pressure applied to the check valve when the check valve is subjected to a water hammer test. Water hammer test equipment.

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