JPS5835849Y2 - valve testing equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a valve testing device for testing the presence or absence of liquid leakage from an inflow path to an outflow path when a valve is closed.

Generally, in a nuclear reactor for a nuclear power plant, a solenoid valve for switching a drive water channel is incorporated into a hydraulic control unit belonging to a control rod drive system.

In order to ensure the safety of the nuclear reactor, this solenoid valve is tested at predetermined intervals to check for liquid leakage from the valve seat. The valve whose presence is tested is called the "valve under test").

However, a conventional valve testing device includes a pressurized tank that stores liquid therein under pressure, a liquid guide pipe that guides the liquid in the pressurized tank to the inflow path of the valve under test, and the liquid guide. There is a known type of valve that includes an on-off valve installed in the middle of a pipe and a gauge tube that detects whether or not liquid leaks from the valve under test.

When performing a liquid leakage test on the valve under test,
Each time a test is conducted, the outlet of the liquid guiding pipe is connected manually to the inlet side of the valve under test, and the outlet side of the valve under test is connected to the gauge pipe, and then the on-off valve is opened and closed, and the valve under test is opened and closed. By doing this, the amount of liquid leaking when the valve is closed can be measured using a gauge tube.

However, in the conventional technology described above, the piping must be connected manually between the valve under test and the waveguide pipe, and between the valve under test and the gauge pipe, respectively, in a liquid-tight manner. This method has the disadvantage that it requires a great deal of effort and time to connect, and the efficiency of testing work is extremely low.

Particularly, when testing a large number of valves to be tested one after another, connecting the pipes one by one has the disadvantage that it is inefficient.

In addition, the location where the valve to be tested is installed is in a radiation environment, and the longer the test time, the more the test worker is exposed to radiation from the surrounding area, which poses a problem.

The present invention was developed in view of the drawbacks and problems of the prior art described above, and allows testing to be carried out by simply fixing the valve under test to a valve mounting jig on a testing table. The purpose of the present invention is to provide a valve testing device that does not require piping connection work.

In order to achieve the above object, the features of the configuration adopted by the present invention include a table for test work, a pressurized tank is placed on the table, and a valve under test is placed on the table. A valve mounting jig is provided, and the valve mounting jig is provided with an inflow connection hole and an outflow connection hole, one end of which is connected to the inflow and outflow paths of the valve under test, respectively. The other ends of the channel connection hole and the outflow channel connection hole are respectively connected to a liquid guide pipe and a gauge pipe connected to the pressurized tank.

The present invention will be described below based on embodiments shown in the drawings.

In FIGS. 1 and 2, reference numeral 1 is a chiffle, and on the table 1 there are placed a pressurized tank 2 for storing liquid, a valve mounting jig 3 for attaching the valve to be tested 3, and a pressure reducing valve 4.

A joint 5 is provided on the upper surface of the pressurized tank 2 for introducing compressed gas such as air or nitrogen gas to pressurize the liquid stored in the pressurized tank 2.

A gas pipe 7 is connected to the joint 5, with a pressure gauge 6 and the pressure reducing valve 4 interposed therebetween, which connects to a pressurized air source (not shown) such as a gas compressor or cylinder.

The valve mounting jig 3 has inflow passages Va and v of the valve V to be tested.
An inflow channel connection hole 3a and an outflow channel connection hole 3b, each of which is connected at one end to b, are bored therein.

A liquid guide pipe 9 with an on-off valve 8 interposed in the middle is connected between the other end of the inflow channel connection hole 3a and the pressurized tank 2, and the inside of the pressurized tank 2 is connected through the liquid guide pipe 9. The pressurized liquid stored in is guided to the inflow path Va.

A gauge tube 10 made of transparent glass, transparent synthetic resin, etc. is connected to the other end of the outlet connection hole 3b, and the gauge tube 10 has a scale.

Reference numeral 11 denotes a table 1 surrounding the valve mounting jig 3.
an enclosure provided above, the table 1 within the enclosure 11;
A drain port 12 is provided in the drain port 12 .

Further, below the drain port 12, a container 13 is attached to a support member 14 fixed to the table 1.

15 and 16 are a safety valve and a gas vent valve connected to the gas pipe 1, respectively.

17 is a drain valve connected to the liquid guide pipe 9.

The present invention is constructed as described above.Next, a method for testing valves using the valve testing device of the present invention will be described.

First, prior to the test, compressed gas from the pressure source was supplied to the pressure reducing valve 4.
The pressure is reduced to a predetermined pressure in the pressurized tank 2 via the gas pipe 7.
The liquid stored in the pressurized tank 2 is brought into a pressurized state.

At this time, the on-off valve 8, the gas vent valve 16, and the drain valve 1
Keep valve 7 closed.

Next, the inflow path Va, the outflow path Vb and the inflow path connection hole 3
a. Attach the valve to be tested (■) to the valve installation jig 3 without aligning it with the outlet connection hole 3b.

After that, the valve V to be tested is opened, and the inlet passage Va and the outlet passage Vb are opened.
At the same time, the on-off valve 8 is opened, and the liquid guiding pipe 9 is opened.
, inflow channel connection hole 3 a %Air stagnant in the inflow channel Va, outflow channel vb and outflow channel connection hole 3b is transferred to the gauge tube 1.
Exhaust via 0.

Then, the remaining air is completely released and the gauge tube 10
After the liquid level reaches an appropriate level, the valve to be tested (2) is closed to shut off the inflow path Va and the outflow path Vb.

The test is started in this state, and the change in the liquid level in the gauge tube 10 after a predetermined period of time is read from the scale attached to the gauge tube 10. Check for leakage from the seat and complete the test for the valve under test (■).

If there are multiple valves V to be tested, repeat the above steps.

At this time, liquid overflows from the valve mounting jig 3 and the like, but this overflowing liquid remains in the enclosure frame 11 and is discharged from the drain port 12 into the container 13.

After the Schete test is completed, only the drain valve 17 is opened, or the gas vent valve 16 is simultaneously opened to discharge the liquid and compressed gas stored in the pressurized tank 2 to the outside.

The present invention has been described in detail above, and since the equipment necessary for the leakage test is mounted on the table, the entire device can be configured compactly, and there is no need to connect piping. Therefore, it has many practical advantages and features, such as being able to shorten testing time and labor and improve work efficiency.

[Brief explanation of drawings]

Figures 1 and 2 are a front view and a side view showing an embodiment of the valve testing device of the present invention. 1...Table, 2...Pressure tank,
3... Front mounting jig, 3a... Inflow channel connection hole, 3b... Outlet channel connection hole, 4... Pressure reducing valve, 5... ...Joint, 6...Pressure gauge, 7
...Gas piping, 8...Opening/closing valve, 9...
...Liquid guide pipe, 10... Gauge pipe, 11.
... Enclosure, 12 ... Drain port, 13 ... Container, 14 ... Support member, 15 ... Safety valve, 16 ... ... Gas vent valve, 7 ... Drain valve, ■ ... Valve under test, Va
...Inflow path, b...Outflow path.

Claims (1)

[Scope of utility model registration request] A pressurized tank that stores liquid inside in a pressurized state, a liquid guide pipe that guides the liquid in the pressurized tank to the inflow path of the valve under test, and an on-off valve provided in the middle of the liquid guide pipe. , a valve testing device serving as a gauge tube for detecting the presence or absence of liquid leakage from the valve under test, having a table for testing work;
The pressurized tank is placed on the table, and a valve mounting jig for mounting the valve under test is provided on the table. An inflow channel connection hole and an outflow channel connection hole are drilled, one end of which is connected to the channel, and the other ends of the inflow channel connection hole and the outflow channel connection hole are connected to the liquid guiding pipe and the gauge pipe, respectively. Characteristic valve testing equipment.