JP6898202B2 - Repair valve leak measuring device and its measuring method - Google Patents

Description

The present invention relates to an air valve attached to a fluid pipeline of clean water, agricultural water, industrial water, etc. via a repair valve, and relates to a leak amount measuring device for the repair valve and a measuring method thereof.

For example, in a fluid pipe such as a water main, the effective cross-sectional area of the pipe may decrease due to air bubbles or air pools in the pipe, and the pipe capacity may decrease. Many air valves for water supply are installed. As an air valve of this type, a rapid air valve for water supply of the Japan Water Works Association JWWA B 137 is generally known, and such an air valve is, for example, an air valve from the water main to the branch side via a T-shaped pipe. It is provided via a repair valve for maintaining and managing the water supply (see Patent Document 1 and Patent Document 2). As the repair valve V, various modes such as a ball valve and a butterfly valve are used.

As an example of the rapid air valve 10 for water supply with a repair valve V, as shown in FIG. 6, a valve chamber 13 is formed inside a bottomed cylindrical guide member (guide) 12 provided inside the valve box 11. , The guide member 12 is formed with a large-volume exhaust / large-volume intake large communication port 15 and a small-volume exhaust / small-volume intake small communication port 16 that communicate with the pipeline connection port 14 at the bottom of the valve box 11. .. A lid 17 is attached to the valve box 11 at the upper part of the valve chamber 13. A rubber valve seat 18 is provided between the lid 17 and the upper portion of the guide member 12, and a protective cover 19 is provided on the upper portion of the lid 17. In the figure, h is an opening / closing handle. For example, in FIG. 6A, the chain line state of the handle h is the open (open) state of the repair valve V, and the solid line state is the close (closed) state of the repair valve V. It is in a state.

An air valve hole 20 is formed in the upper part of the valve chamber 13, and a reverse bowl-shaped floating valve body 21a and a float valve body 21b are housed in the valve chamber 13, and the floating valve body 21a and the float valve body 21b accommodate the float valve 21. Consists of. The float valve 21 opens and closes the air valve hole 20.
The floating valve body 21a has a rubber valve seat 23 having a small air valve hole 22, and the rubber valve seat 23 is fixed by a screw member 25 having a ventilation hole 24 in the center, and the screw member 25 is the center of the floating valve body 21a. It is fixed to.

As shown in FIG. 6A, the float valve 21 of the air valve 10 is lowered when water does not flow into the valve box 11, and the air valve 10 is connected to the outside of the guide member 12 from the pipeline connection port 14. An exhaust flow path is formed from the passage Dalian passage port 15 and the small communication port 16 to the air valve hole 20 at the upper part of the valve chamber 13. Therefore, it is possible to rapidly exhaust a large amount of air existing in the water pipe when the water pipe is newly constructed or when water is passed for the first time after the water supply is cut off.

As shown in FIG. 6B, when water a flows into the valve chamber 13 due to the exhaust of the air, the float valve 21 rises due to the water a flowing into the valve chamber 13, and the floating valve body 21a moves into the valve chamber. The air valve hole 20 at the top of 13 is closed. At this time, the floating valve body 21a is pressed against the valve seat 18 by (the area of the air valve hole 20) × (the force of the water pressure of the valve chamber 13). Further, the float valve body 21b is also pressed against the rubber valve seat 23 by (the area of the ventilation hole 24) × (the force of the water pressure of the valve chamber 13).
In this state, when air flows into the valve chamber 13 from the pipeline connection port 14 via the large communication port 15 or the small communication port 16, the water level in the valve chamber 13 drops, and the float valve body 21b becomes the above-mentioned (area of the ventilation hole 24). ) X (the force of the water pressure in the valve chamber 13), the weight of the valve exceeds the pressing force, and the valve opens (opens the ventilation hole 24) away from the small air valve hole 22 (rubber valve seat 23) (FIG. 6). (B) Chain line state). As a result, an exhaust flow path from the pipeline connection port 14 to the ventilation hole 24 is formed, so that the air in the water pipeline is exhausted to the outside.

Japanese Unexamined Patent Publication No. 10-318393 Japanese Unexamined Patent Publication No. 2001-221355

In such an air valve 10 with a repair valve V, when disassembling and inspecting and repairing the air valve 10, it is necessary to close the repair valve V (solid line in FIG. 6) and set the water pressure in the air valve 10 to 0 (zero). There is. To adjust the water pressure, as shown in FIGS. 6 (b) and 6 (c), the cover 19 is removed, the valve body retainer 35 is applied to the upper portion of the screw member 25, and the retainer rod (pressing pin) 36 is applied. It pierces the ventilation hole 24 (FIG. 6 (c)). Due to the piercing, the float valve body 21b can be easily pushed down by the thin pressing rod 36 because the external exposed area is circular and small with the diameter of the small air valve hole 22. When the float valve body 21b is pushed down (chain line state in the figure), air and water in the valve chamber 13 are discharged from the small air valve hole 22 through the ventilation hole 24 and the hole 35a of the valve body retainer 35. ..
At this time, if there is no leakage in the repair valve V, the internal pressure in the valve chamber 13 of the air valve 10 disappears, so that the floating valve body 21a can be easily lowered. When the floating valve body 21a is pushed down (see FIG. 4B), the water level in the valve chamber 13 and the like can be seen, and the leakage of the repair valve V can be accurately grasped. If there is no leakage, there is no problem even if the air valve 10 is removed.

On the other hand, when the repair valve V is not operated for a long period of time, the valve seat of the repair valve contains minerals such as scale and calcium, although it may be early or slow depending on the water quality, piping, and the type of valve in the piping. , Rust may adhere and water may not be completely stopped.
In this case, the float valve body 21b can be easily pushed down as described above, but even if the air and water in the valve chamber 13 are discharged from the small air valve hole 22, water leakage from the repair valve V Water pressure is applied to the inside of the valve chamber 13 (water continues to leak from the small air valve hole 22).

At this time, if the floating valve body 21a can be pushed down, the degree of leakage of the repair valve V can be confirmed, and if the amount of leakage is small, it can be determined whether or not inspection / repair is possible.
However, if the floating valve body 21a cannot be pushed down, it is judged by the amount of drainage (leakage amount) from the small air valve hole 22, but since the small air valve hole 22 has a small diameter, even a small amount of leakage is large. There is no big difference in the amount of water ejected even if there is a leak, and it is not easy to grasp the amount of leakage. Therefore, the floating valve body 21a is pushed down to grasp the leakage of the repair valve V.
The pushing down force P of the floating valve body 21a is proportional to the pressure receiving area of the floating valve body 21a and the water pressure of the connecting pipe (connection port), and the pressure receiving area is the square of the diameter of the air valve 10 as the diameter increases. It increases in proportion to. Therefore, even if the water pressure of the connecting pipes having the same diameter is different, the pushing force P will be significantly different if the diameter of the air valve 10 is different.

For example, if the connecting pipe is low pressure and the water pressure is 0.1 MPa (× 10.2 = 1.02 kgf / cm ² ), when the diameter is φ75, the pressure receiving area is 44.156 (≈ (7.5 / 2)). ^{At 2} × 3.14) cm ² , P≈45 (1.02 × 44.156) kgf, and when the diameter is φ150, the pressure receiving area is 176.6 (≈ (15/2) ² × 3.14). At cm ² , P≈180 kgf (1.02 × 176.6). Further, when the diameter is φ150 and the water pressure is high, for example, in the case of 1.2 MPa (× 10.2 = 12.24 kgf / cm ² ), P≈2160 kgf (12.24 × 176.6 = 2.16 Ton). Become. In addition, regardless of the diameter and the water pressure, there are cases where the small diameter is high pressure and the large diameter is low pressure.
Therefore, in the case of the former caliber: φ75, the pushing force P of the floating valve body 21a is ≈45 kgf. Therefore, if the entire weight of a person is placed on the floating valve body 21a, the floating valve body 21a can be pushed down. However, in the case of the latter caliber: φ150, P≈180 kgf or more (for example, 2.16 Tons), so that it is difficult for a normal person to push down the floating valve body 21a even if the entire weight is put on it. That is, even if the amount of leakage of the repair valve V is small, the floating valve body 21a cannot be easily pushed down if there is a leakage. Further, if the player tries to push it down forcibly, the floating valve body 21a is broken.

If the floating valve body 21a cannot be pushed down, it will be judged by the amount of drainage (leakage amount) from the small air valve hole 22 as described above, but since the small air valve hole 22 has a small diameter, a small amount of leakage will occur. However, even with a large amount of leakage, there is no big difference in the amount of water ejected, and it is not easy to grasp the amount of leakage.
Therefore, if the repair valve V is closed and the air valve 10 is removed from the repair valve V without pushing down the floating valve body 21a to grasp the leakage of the repair valve V, a large amount of leakage may occur. For example, a large amount of water is ejected from the water pipe through the repair valve V, and the ejected flow puts the operator at risk. In addition, it is necessary to cut off the water supply line in order to restore it.

Under such a situation, conventionally, when the repair valve V has leaked and the floating valve body 21a cannot be pushed down and the leak amount cannot be grasped, the air valve 10 is similar to the case where the leak amount is large. The air valve 10 is inspected and repaired after the water pipe is cut off.
However, water cutoff work for water pipes requires a lot of personnel and time, such as giving notice to consumers, passing water after the work, and taking measures against red water and cloudy water at the time of passing water.
On the other hand, most of the leaks of the repair valve V are usually a small amount of leaks, and there are very few (very) cases where a large amount of leaks actually occur so that water cutoff is required.

In the present invention, if the leak of the repair valve can be easily and safely measured under the above circumstances, it can be easily grasped that the leak is a small amount. The challenge is to be able to measure safely.

In order to achieve the above object, the present invention forms a closed space in the valve box of the air valve in which the air valve hole in the valve box opens in the air valve attached to the fluid pipeline via the repair valve. The sealed space is a leak amount measuring device for a repair valve having a pressure gauge and an on-off valve to the outside air.
With this configuration, when the repair valve is closed and the on-off valve is opened, if there is no water leakage from the on-off valve, there is no leakage in the repair valve, and if there is a leak in the repair valve, the water leakage passes through the closed space. Is discharged to the outside from the on-off valve. Therefore, the presence or absence of leakage of the repair valve can be confirmed by the presence or absence of water leakage.
If there is such water leakage, when the on-off valve is closed, even if the amount of leakage is small, the pressure inside the fluid pipeline raises the pressure inside the valve box through the air valve hole in the closed space, which is equal to the fluid pressure inside the fluid pipeline. Become. When the on-off valve is opened to open the closed space to the outside air while the fluid pressure is applied to the valve chamber, the leaked fluid is discharged from the on-off valve to the outside through the closed space. Therefore, if the leak amount is measured and the leak amount per unit time is large, the measured value (indicated value) of the pressure gauge does not decrease, so the leak amount of the repair valve is determined by the leak amount and the measured value by the pressure gauge. Can be grasped.

In the above configuration, the air valve has a float valve body, a floating valve body that opens and closes the air valve hole, and a guide of the floating valve body in the valve box, and the float valve body is a floating valve. It opens and closes a small air valve hole leading to the air valve hole of the body, and forms the closed space by pressing and fixing a cup-shaped container on the upper part of the valve box, and the container is equipped with the pressure gauge and the on-off valve and is idle. The valve body may be provided with a valve body retainer having a push-down pin that pushes down the float valve body through the small air valve hole to open the small air valve hole.
In the measurement method using the leak amount measuring device for the repair valve having this configuration, the float valve body is pushed down by the push-down pin to open the small air valve hole, so that the fluid flows into the closed space and is sealed with the fluid pressure in the valve box. Equalize the fluid pressure in space. When the pressure inside the valve box and the inside of the closed space become equal, the floating valve body can be easily pushed down. Therefore, the push-down pin is further pushed down to push down the floating valve body to open the air valve hole, and in the open state, When the on-off valve is opened and no fluid comes out, it is judged that the repair valve is securely closed and there is no leakage, while the fluid leaks from the on-off valve and the indicated value of the pressure gauge is less than the required value. If so, it is judged that the amount of leakage is such that the air valve can be removed, and if the required value of the pressure gauge reading value or more continues, it is judged that the amount of leakage is such that the air valve must be removed unless the fluid pipeline is cut off. .. The required value is appropriately determined by an empirical rule.

Since the present invention is configured as described above, the amount of leakage of the repair valve can be safely measured with a simple configuration. Therefore, when disassembling and inspecting and repairing the air valve, it is possible to minimize the need to cut off the water in the pipeline.

Front view showing an embodiment of a leak amount measuring device for an air valve with a repair valve according to the present invention. Top view of the same embodiment Right side view of cutting of the same embodiment Right side view of cutting for explaining the operation of the same embodiment Right side view of cutting for explaining the same effect Leakage calculation explanatory diagram of the repair valve in the same embodiment Cross-sectional view for explaining the operation of an air valve with a repair valve

An embodiment of the present invention is shown in FIGS. 1 to 5, and the air valve 10 and the repair valve V of this embodiment are repaired in the same manner as the conventional one shown in FIG. It is a rapid air valve for water supply (caliber: 150 mm) 10 with a valve V, and the same reference numerals indicate the same thing. The present invention is characterized in that, in the air valve 10 with a repair valve V, a leak amount measuring device 30 is provided above the valve box 11.

As shown in FIGS. 1 to 3, the leak amount measuring device 30 has a main body 31 having arms extended on both sides of the disk-shaped member, and a rod-shaped member 32 erected and fixed in the center of the main body 31. A through hole for a bolt 31b is formed in both side arms 31a of the main body 31.
A pressing bolt 33 is screwed into the rod-shaped member 32, and a valve body pressing bolt 34 is screwed into the pressing bolt 33 to penetrate the rod-shaped member 32. A cup-shaped valve body retainer 35 is located below the push bolt 34, and the valve body retainer 35 has a push-down pin 36 made of a steel wire inserted into the ventilation hole 24 of the floating valve body 21a. The valve body retainer 35 is pushed downward by screwing the push bolt 34 into the presser bolt 33.
Further, the rod-shaped member 32 is provided with an H-shaped frame 37 that can move in the vertical direction and cannot rotate, and hooks 38 are provided at both ends thereof so as to be swingable. A pressing bolt 33 is screwed through the frame 37, and the frame 37 moves up and down on the rod-shaped member 32 by screwing the pressing bolt 33 with respect to the rod-shaped member 32. The hook 38 is supported by a support shaft 38a, and the support shaft 38a is prevented from coming off by a fastener 38b.

An elbow pipe 41 is provided at one end of the main body 31, and the elbow pipe 41 is opened to the atmosphere via an air vent opening / closing valve (ball valve) 42, and a pressure gauge 43 is attached in the middle of the elbow pipe 41. An elbow pipe 44 is also provided at the other end of the main body 31, and an on-off valve (ball valve) 45 for measuring the amount of leakage is interposed in the elbow pipe 44.
Further, a tubular body 47 having the same axis as the valve box 11 is fixed to the lower surface of the main body 31, and a ring 48 is provided on the entire lower circumference of the tubular body 47. The ring 48 is connected to the valve box via a gasket 49. 11 It is brought into contact (pressure contact) with the upper surface. The main body 31, the tubular body 47, and the ring 48 are welded to each other to form an integral body.

The leak amount measuring device 30 of this embodiment has the above configuration. When attempting to disassemble, inspect, or repair a certain air valve 10 with a repair valve V, after closing the repair valve V, the cover 19 is removed and the air valve 10 is idle. The valve body retainer 35 is installed at the center of the valve body 21a by inserting the pressing pin 36 into the ventilation hole 24 (see FIG. 6 (a) → FIG. 6 (b) → FIG. 6 (c)).
After that, the leak amount measuring device 30 is placed on the upper part of the air valve 10, and as shown in FIGS. 1 to 3, first, the bolt 31b is screwed into the lid 17 of the valve box, the main body 31 is attached to the valve box 11, and the ring. 48 is pressed against the upper surface (lid 17) of the valve box 11 via the gasket 49 to form a closed space 47a in the upper part of the valve box 11 by the tubular body 47 or the like.
Next, the hook 38 is hooked on the flange of the valve box 11, and the hook 38 is stretched against the flange of the valve box by screwing the holding bolt 33 to firmly attach the leak amount measuring device 30 to the air valve 10. At this time, the tubular body 47 is further pressed against the upper surface (lid 17) of the valve box 11 via the ring 48, and the inside of the tubular body 47 is more reliably sealed (becomes watertight and a sealed space 47a is formed inside). Will be). In FIGS. 1 to 3, 4A, and B, water a is omitted.
Since the elbow pipes 41 and 44, the on-off valves 42 and 45, and the pressure gauge 43 are displaced outward from the center of the main body 31 to attach the leak amount measuring device 30 to the air valve 10, they do not get in the way and work. It has good properties and is less likely to damage them during work.

In this state, the ball valves 42 and 45 are opened, and the push bolt 34 is screwed down to push down. When the push bolt 34 comes into contact with the valve body retainer 35 and is further pushed down as the push bolt is pushed down, the push down pin 36 advances downward from the small air valve hole 22 and the float valve body 21b is moved from FIG. 3 to FIG. 4A. As shown in the above, the small air valve hole 22 is opened apart from the floating valve body 21a. Then, the air in the valve box 11 is released and the water is discharged. When the filling of the valve box 11 is confirmed (when the air is released), the ball valves 45 and 42 are slowly closed in that order. The indicated value (indicated pressure H) (MPa) of the pressure gauge 43 when the pressure gauge 43 is closed becomes the pressure in the valve chamber 13, that is, the pressure in the main pipe.

In this state, the water pressures of the upper part (sealed space 47a) and the lower part (inside the valve chamber 13) of the floating valve body 21a are the same (equal pressure). Therefore, the floating valve body 21a can be easily lowered, and further, the push bolt 34 is screwed and pushed down, and as shown in FIG. 4B, the floating valve body 21a is lowered via the valve body retainer 35. As a result, the inside of the closed space 47a and the inside of the valve chamber 13 communicate with each other through the air valve hole 20.
In this communication state, when the ball valve 45 is opened and water does not come out from the ball valve 45, the water pressure in the main pipe is not applied to the valve chamber 13, and the repair valve V is surely closed and leaks. Will be in a state where there is no. Therefore, the air valve 10 is removed from the repair valve V for overhaul and repair.

On the other hand, when the ball valve 45 is opened and water comes out from the bar valve 45, the amount of the water that comes out is measured and the value h of the pressure gauge 43 is confirmed. At this time, if the value h of the pressure gauge 43 is "0 (zero) MPa", the measured amount of water becomes the leak amount Q of the repair valve V, and the leak amount Q does not hinder even if the air valve 10 is removed. If the value is not found, the air valve 10 is removed from the repair valve V for overhaul and repair. The value is appropriately determined by an empirical rule. Since the elbow pipe 44 has a downward opening when measuring the leak amount Q, it is easy to receive the water leak from the elbow pipe 44 with a graduated container such as a beaker.

Further, even if the valve 45 is opened, if the value h of the pressure gauge 43 indicating the pressure in the closed space 47a is not "0PMa" but continues to indicate the pressure (h> 0), first, as shown in FIG. 5, the above. The indicated pressure H (MPa) of the pressure gauge 43 when the valves 45 and 42 are closed is converted into the main pipe internal pressure Hm (m) (Hm = (H / 0.098) × 10 (m)).
Next, the pressure h in the closed space 47a is converted into hm (m) (hm = (h / 0.098) × 10 (m)). Further, the leakage amount (outflow amount) Q from the valve 45 is converted into seconds (Q'= m ³ / s (sec)).
Further, the difference Δh (= Hm−hm) between the internal pressure Hm of the connecting pipe (main pipe) and the internal pressure hm of the air valve 10. To calculate.
After obtaining more values Hm (m), hm (m ), Q ' and ^(m 3 / s), firstly, from Delta] h, flows through the gap repair valves V (leaks) obtaining the flow velocity _{V 1} of the water (V ₁ = √ (2 · g · Δh), g: Gravitational acceleration 9.8 (m / sec ² ).

_{Next, the circulation area A 1} (= Q / V ₁ (m ² )) of the valve seat gap of the repair valve V is obtained from the flow velocity V _{1 and the leakage amount Q'.} On the other hand, when the leak amount measuring device 30 is not attached, the flow velocity V ₀ of the water flowing through the valve seat gap of the repair valve V is √ (2 · g · Hm) (m ³ / s), and the leak amount. _{The leakage amount Q 0} of the repair valve V when the measuring device 30 is not attached is “v ₀ · A ₁ (m ³ / s)”.

If the leakage amount Q ₀ is a value that does not hinder the removal of the air valve 10, the air valve 10 is removed from the repair valve V for overhaul and repair. Similarly, the above value is appropriately determined by an empirical rule. On the other hand, the amount of leakage Q ₀ is large, and when the air valve 10 is removed, a large amount of water is ejected from the water pipe through the repair valve V, and the ejected flow causes a dangerous amount such that the operator is endangered. If the amount cannot be reassembled, the water pipe (main pipe) provided with the air valve 10 is cut off and frozen, and then the air valve 10 is removed for inspection and repair. Similarly, the amount of leakage such as the dangerous amount is appropriately determined by an empirical rule.

For example, if the pressure inside the connecting pipe (main pipe) is H: 1.3 MPa, the value of the pressure gauge 43 is 0.05 MPa, and Q'= 0.005 m ³ / s (= 500 l / min),
Δh (= Hm-hm) = 1.295 MPa
From V ₁ = √ (2 · g · Δh), V ₁ : 50 m / s,
From A ₁ (= Q / V ₁ (m ² )), A ₁ : 0.0001 m ² ,
From v ₀ · A ₁ , Q ₀ = 303 (l / min).
This Q ₀ is a large amount of water leakage, After removing the air valve 10, the large amount of water is ejected, by the jet stream, a worker is exposed to danger.
The above calculation is performed by a dedicated device or a personal computer equipped with the calculation software.

The above embodiment, the opening and closing valve 42, 45 provided respectively provided elbow pipe 41 and 44, the measurement of the pressure h, the measurement of the leakage amount Q _0, if there is one of the on-off valve 42 or 45 It can be carried out. Therefore, one on-off valve 42 or 45 can be omitted, but since the on-off valve and the pressure gauge 43 are preferably separated from each other, it is preferable to omit the on-off valve 42. When the on-off valve 45 is omitted, the elbow pipe 44 is also omitted.
Further, in the above embodiment, the cup container (device main body 31, tubular body 47, ring 48) forming the closed space 47a is attached (pressure-welded) to the upper portion (lid 17) of the valve box 11 by the lid 31b. It was fastened to 17 and stretched to the lid 17 by the hook 38, but the bolt 31b and the like were omitted and only the hook 38 was stretched to the lid 17, or the hook 38 and the like were omitted and the bolt 31b and the like were omitted. It may be done only by such as. When the hook 38 or the like is omitted, the frame 37 can also be omitted, and the holding bolt 33 is also integrated with the rod-shaped member 32, and the valve body holding bolt 34 is screwed into the holding holding bolt 33 to hold the valve body holding 35. Lower.
Thus, the embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present invention is indicated by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

V Repair valve 10 Air valve 11 Valve box 12 Guide member (guide)
13 Valve chamber 14 Pipe connection port 15 Dalian port 16 Small communication port 17 Valve box lid 18 Rubber valve seat 19 Cover 20 Air valve hole (large air hole)
21 Float valve 21a Float valve floating valve body 21b Float valve body 22 Small air valve hole (valve seat)
23 Rubber valve seat (small air valve hole valve seat)
24 Ventilation hole (upper part of small air valve hole)
30 Leakage measuring device 31 Device body 32 Rod-shaped member 33 Pressing bolt 34 Valve body pressing Push bolt 35 Valve holding 36 Pushing pin 37 Frame 38 Hook 41, 44 Elbow pipe 42 Air bleeding ball valve (open / close valve)
43 Pressure gauge 45 Ball valve for flow rate measurement (open / close valve)
47 Cylinder 48 Ring 49 Gasket

Claims (3)

In the air valve (10) attached to the fluid conduit via the repair valve (V), the air valve (10) has a float valve (21) in the valve box (11) and the float valve (10). It has an air valve hole (20) to which the 21) comes into contact with and separates from the air valve hole (20).
A closed space (47a) through which the air valve hole (20) opens is formed on the outside of the valve box (11) so that it can be attached and detached, and the closed space (47a) is connected to the pressure gauge (43) and the outside air. Equipped with an on-off valve (45)
With the sealed space (47a) attached to the outside of the valve box (11) of the air valve (10), the repair valve (V) is closed and the float valve (21) is pushed down to push down the air valve hole (20). ), A fluid can flow into the closed space (47a) from the inside of the valve box (11) through the air valve hole (20), and the fluid pressure in the closed space (47a) is measured by the pressure gauge ( A method for measuring the amount of leakage of a repair valve, which measures with 43), opens the on-off valve (45), and measures the amount of fluid flowing out from the on-off valve (45). In the air valve (10) attached to the fluid pipeline via the repair valve (V), the valve box (11) of the air valve (10) has an air valve hole (20) in the valve box (11). A closed space (47a) to be opened is formed, and the closed space (47a) is a leak amount measuring device for a repair valve provided with a pressure gauge (43) and an on-off valve (45) to the outside air .
The air valve (10) is a float valve body (21b) in the valve box (11), a floating valve body (21a) that opens and closes the air valve hole (20), and the floating valve body (21a). It has a guide (12), and the float valve body (21b) opens and closes a small air valve hole (22) leading to an air valve hole (20) of the floating valve body (21a).
A cup-shaped container (31, 47, 48) is pressed and fixed to the upper portion of the valve box (11) to form the sealed space (47a), and the pressure gauge (43) and the pressure gauge (43) are placed in the container (31, 47, 48). The floating valve body (21a) is provided with an on-off valve (45), and the float valve body (21b) is pushed down through the small air valve hole (22) to open the small air valve hole (22). A valve body retainer (35) having a push-down pin (36) is provided, and the valve body retainer (35) floats when the small air valve hole (22) by the push-down pin (36) is further pushed down in an open state. A leak amount measuring device for a repair valve in which the valve body (21a) is pushed down to open the air valve hole (20). The method for measuring a leak amount of a repair valve by the leak amount measuring device for a repair valve according to claim 2, wherein the float valve body (21b) is pushed down by the push-down pin (36) to open a small air valve hole (22). By opening, a fluid flows into the closed space (47a), the fluid pressure in the valve box (11) is made equal to the fluid pressure in the closed space (47a), and the push-down pin (36) is pushed down to make the floating valve. When the body (21a) is pushed down to open the air valve hole (20) and the on-off valve (45) is opened to prevent fluid from flowing out, the repair valve (V) is securely closed. It is judged that there is no leakage, while if the fluid leaks from the on-off valve (45) and the indicated value of the pressure gauge (43) is less than the required value, the air valve (10) may be removed. If it is judged to be the amount and the indicated value of the pressure gauge (43) is equal to or more than the required value, the leak amount of the repair valve is judged to be the leak amount that the air valve (10) must not be removed unless the water flow line is cut off. Method.

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