JP2021113600A - Exhaust valve unit - Google Patents

Abstract

To improve air exhaust efficiency during delivery of a liquid (during a normal operation).SOLUTION: An exhaust valve unit 100 includes: a first exhaust valve 10 which is configured to close when a liquid in a liquid pipe 1 flows thereinto during delivery of the liquid and open to discharge a gas when the gas in the liquid pipe 1 flows thereinto; a second exhaust valve 20 which is configured to discharge a gas in the liquid pipe 1 flowing thereinto during an initial stage of the delivery of the liquid, then be closed by the liquid in the liquid pipe 1 flowing thereinto, and keep a valve closed state; an inflow passage (a first passage 41 and a second passage 42) which is connected to the first exhaust valve 10 and the second exhaust valve 20 and the liquid pipe 1 and into which the liquid and the gas flow from the liquid pipe 1; and a restriction part (a projection 43 and a space 44) which is provided at the inflow passage and restricts flow of the gas flowing from the liquid pipe 1 toward the second exhaust valve 20 during the delivery of the liquid.SELECTED DRAWING: Figure 1

Description

The present application relates to an exhaust valve unit including a plurality of types of exhaust valves.

As an exhaust valve attached to a liquid pipe for sending a liquid such as water and discharging a gas in the pipe, for example, a rapid exhaust valve disclosed in Patent Document 1 and an automatic exhaust valve disclosed in Patent Document 2 are used. Are known. The quick exhaust valve is configured to rapidly discharge a large amount of air existing in the pipe at the initial stage of liquid feeding to close the valve, and then maintain the valve closed state. The automatic exhaust valve has a smaller exhaust capacity than the rapid exhaust valve, and is configured to open the valve each time air flows in during liquid feeding to discharge the air.

Japanese Unexamined Patent Publication No. 2003-194247 Japanese Unexamined Patent Publication No. 2005-61523

When the above-mentioned two types of exhaust valves are provided in the liquid pipe, it may be difficult for air to be discharged from the automatic exhaust valve depending on how they are provided. That is, there is a case where the air discharge efficiency is deteriorated at the time of liquid feeding.

The technique disclosed in the present application has been made in view of such circumstances, and an object thereof is to improve the air discharge efficiency during liquid feeding (normal operation).

The technique disclosed in the present application is an exhaust valve unit provided in a liquid pipe to which a liquid is sent. The exhaust valve unit includes a first exhaust valve, a second exhaust valve, an inflow path, and a regulating unit. The first exhaust valve is configured to close when the liquid in the liquid pipe flows in during liquid feeding and open when the gas in the liquid pipe flows in to discharge the gas. The second exhaust valve is configured to discharge the gas of the liquid pipe that flows in at the initial stage of liquid feeding, and then close the valve by the liquid of the liquid pipe that has flowed in to maintain the valve closed state. .. The inflow path is connected to the first exhaust valve and the second exhaust valve and the liquid pipe, and liquid and gas flow in from the liquid pipe. The regulation unit is provided in the inflow path and regulates the flow of the gas flowing from the liquid pipe toward the second exhaust valve at the time of the liquid feeding.

Another technique disclosed in the present application is an exhaust valve unit provided in a liquid pipe to which a liquid is sent, which includes a first exhaust valve, a second exhaust valve, a communication passage, and a regulation unit. The first exhaust valve is configured to close when the liquid in the liquid pipe flows in during liquid feeding and open when the gas in the liquid pipe flows in to discharge the gas. The second exhaust valve includes a casing having an inflow port and an outflow port, a flow path connecting the inflow port and the outflow port, and a valve chamber provided in the flow path, and the inflow port is connected to the liquid pipe. Has been done. The second exhaust valve discharges the gas of the liquid pipe flowing into the inflow port from the outlet at the initial stage of liquid feeding, and then closes the valve with the liquid of the liquid pipe flowing into the inflow port. It is configured to maintain the valve closed state. One end of the communication passage communicates with a portion of the second exhaust valve on the inflow port side of the valve chamber in the flow path, and the other end is connected to the first exhaust valve. The regulating unit is provided on the inflow port side of the flow path of the second exhaust valve with respect to the valve chamber, and regulates the flow of gas flowing from the liquid pipe toward the valve chamber at the time of delivering the liquid. ..

According to the technique disclosed in the present application, it is possible to improve the air discharge efficiency during liquid feeding (normal operation).

FIG. 1 is a partial cross-sectional view showing a schematic configuration of an exhaust valve unit according to the first embodiment. FIG. 2 is a cross-sectional view showing a schematic configuration of the first exhaust valve. FIG. 3 is a cross-sectional view showing a main part of the second exhaust valve. FIG. 4 is a partial cross-sectional view showing a schematic configuration of the exhaust valve unit according to the second embodiment. FIG. 5 is a partial cross-sectional view showing a schematic configuration of the exhaust valve unit according to the third embodiment.

Hereinafter, embodiments of the present application will be described with reference to the drawings. It should be noted that the following embodiments are essentially preferred examples and are not intended to limit the scope of the techniques disclosed in the present application, their applications, or their uses.

(Embodiment 1)
The first embodiment of the present application will be described with reference to FIGS. 1 to 3. The exhaust valve unit 100 of the present embodiment is provided in the liquid pipe 1 in which the liquid is sent to the user side, and discharges the gas existing in the liquid pipe 1. In this embodiment, water and air will be described as examples of liquid and gas, respectively. The liquid pipe 1 extends in the horizontal direction.

The exhaust valve unit 100 includes a first exhaust valve 10, a second exhaust valve 20, an inflow path, and a regulation unit. All of the exhaust valve units 100 are provided above the liquid pipe 1.

The first exhaust valve 10 closes when the water in the liquid pipe 1 flows in during liquid feeding (normal operation), and opens when the air in the liquid pipe 1 flows in to discharge the air. It is a so-called automatic exhaust valve that is configured in. Specifically, as shown in FIG. 2, the first exhaust valve 10 includes a casing 11, a valve seat 16, and a float 18 (valve body).

The casing 11 is formed with an inflow port 12, a valve chamber 13, a discharge passage 14, and an outflow port 15. The inflow port 12 is provided coaxially with the outflow port 15 and communicates with the valve chamber 13. The discharge passage 14 communicates with the outlet 15. The first exhaust valve 10 is provided in a state in which the inflow port 12 opens downward and the outflow port 15 opens upward. That is, the axial centers of the inflow port 12 and the outflow port 15 extend in the vertical direction.

The valve seat 16 is formed in a substantially cylindrical shape, and a valve hole 17 is formed inside. The valve seat 16 is provided above the valve chamber 13. The valve seat 16 is provided so that the valve hole 17 extends in a direction oblique to the vertical direction. The valve chamber 13 communicates with the discharge passage 14 through the valve hole 17. That is, in the casing 11, the inflow port 12, the valve chamber 13, the valve hole 17, the discharge passage 14, and the outflow port 15 form one flow path.

The float 18 is formed in a hollow spherical shape and is freely arranged in the valve chamber 13. The float 18 is configured to open and close the valve hole 17 by ascending and descending according to the water level of the valve chamber 13 and taking off and seating on the valve seat 16. That is, the float 18 closes (closes) the valve hole 17 by sitting on the valve seat 16 and opens (opens) the valve hole 17 by leaving the valve seat 16. In this way, the first exhaust valve 10 closes when the water level in the valve chamber 13 rises to a predetermined position, while it opens when air flows into the valve chamber 13 and the water level drops below the predetermined position to release air. It is configured to discharge.

The second exhaust valve 20 discharges the air of the liquid pipe 1 that flows in at the initial stage of liquid feeding (at the initial stage of operation), and then closes the valve with the water of the liquid pipe 1 that has flowed in to maintain the valve closed state. It is a so-called quick exhaust valve that is configured as such. Specifically, as shown in FIG. 3, the second exhaust valve 20 includes a casing 21, a valve seat 28, and a float 31 (valve body), and has a larger exhaust capacity than the first exhaust valve 10. ..

The casing 21 has a substantially cylindrical main body 22 extending vertically and a lid 23 for closing the upper opening of the main body 22. The casing 21 is formed with an inflow port 24, an outflow port 25, a flow path 27, and a valve chamber 32. The inflow port 24 is provided at the lower end of the main body 22, and the outflow port 25 is provided on the lid 23. That is, the inflow port 24 and the outflow port 25 are provided at the upper part and the lower part of the casing 21, respectively. The inflow port 24 is provided coaxially with the outflow port 25, and has a diameter larger than that of the outflow port 25.

The flow path 27 extends vertically and connects the inflow port 24 and the outflow port 25. The valve chamber 32 is provided in the upper part of the flow path 27. The valve chamber 32 is configured to guide the ascent and descent of the float 31, which will be described later, and to regulate the lower limit position of the float 31. Further, a through hole 33 for communicating with the flow path 27 is formed in the lower portion of the valve chamber 32.

The valve seat 28 is formed in an annular shape, and a valve hole 29 is formed inside. The valve seat 28 is provided above the valve chamber 32. The valve seat 28 is provided so that the valve hole 29 opens in the vertical direction. The valve hole 29 of the second exhaust valve 20 has a much larger hole diameter than the valve hole 17 of the first exhaust valve 10. The valve chamber 32 communicates with the outlet 25 via the valve hole 29. That is, in the second exhaust valve 20, the inflow port 24, the flow path 27, the valve chamber 32, the valve hole 29, and the outflow port 25 form one flow path.

The float 31 is formed in a hollow spherical shape and is freely arranged in the valve chamber 32. The float 31 is configured to take off and seat on the valve seat 28 due to the pressure difference between the upstream and downstream of the valve hole 29, and open and close the valve hole 29. That is, when the float 31 is seated on the valve seat 28 due to the pressure increase on the upstream side (valve chamber 32 side) and the valve hole 29 is closed (valve closed), the pressure difference between the upstream and downstream is less than a predetermined value (for example,). Unless the pressure becomes zero), the valve hole 29 is not opened (opened) even if the water level in the valve chamber 32 drops. As described above, the second exhaust valve 20 is opened only at the initial stage of liquid feeding to discharge the air, and the valve closed state is maintained and the air is not discharged at the time of the subsequent liquid feeding.

The inflow path is connected to the first exhaust valve 10, the second exhaust valve 20, and the liquid pipe 1, and water and air flow in from the liquid pipe 1. Specifically, as shown in FIG. 1, a pipe 40 is connected between the first exhaust valve 10 and the second exhaust valve 20 and the liquid pipe 1.

The pipe 40 is integrally formed by casting. The inflow path described above is formed in the pipe 40. The inflow path has a first flow path 41 and a second flow path 42.

The first flow path 41 is a straight flow path extending vertically, and is connected to the first exhaust valve 10 and the liquid pipe 1. More specifically, the upper end of the first flow path 41 is connected to the inflow port 12 of the first exhaust valve 10 via the pipe 60. The flow path diameter of the first flow path 41 is larger than the diameter of the inflow port 12 of the first exhaust valve 10 and the pipe diameter of the pipe 60.

One end of the second flow path 42 is connected to a side portion below the upper end of the first flow path 41, and the other end is connected to the second exhaust valve 20. More specifically, the second flow path 42 is a 90-degree curved flow path that extends horizontally from the first flow path 41 and then extends vertically upward. The other end of the second flow path 42 is directly connected to the inflow port 24 of the second exhaust valve 20.

A pipe 65 is connected to the outlet 15 of the first exhaust valve 10. A pipe 70 is connected to the outlet 25 of the second exhaust valve 20. The pipe 65 and the pipe 70 are air outflow pipes and are open to the outside air.

The regulation unit is provided in the inflow path described above, and regulates the flow of the air flowing in from the liquid pipe 1 toward the second exhaust valve 20 at the time of liquid feeding. In other words, the regulation unit is a guide unit that guides the air flowing from the liquid pipe 1 to the first exhaust valve 10 side at the time of liquid feeding.

As shown in FIG. 1, the regulating portion has a space 44 and a protrusion 43. The space 44 is formed above the connection portion of the first flow path 41 with the second flow path 42. The protrusion 43 projects downward at the connection portion with the first flow path 41 in the second flow path 42. In the regulation section, the air flowing in from the liquid pipe 1 is accumulated in the space 44, so that the flow of air toward the second exhaust valve 20 side is regulated. Further, the flow of the air accumulated in the space 44 toward the second exhaust valve 20 side is regulated by the protrusion 43.

Further, the exhaust valve unit 100 has a vacuum relieving mechanism for relieving the vacuum state of the liquid pipe 1 and the inflow path. Specifically, the casing 21 of the second exhaust valve 20 is provided with an emergency inflow port 26. The emergency inflow port 26 communicates with a portion of the flow path 27 below the valve chamber 32. The emergency inflow port 26 is connected to the pipe 80 via a check valve 35. The pipe 80 is an air inflow pipe and is open to the outside air. The check valve 35 allows only the flow of air from the pipe 80 side to the emergency inflow port 26 side. In this vacuum elimination mechanism, when the liquid pipe 1, the inflow path, or the like is in a vacuum state, air flows into the flow path 27 from the emergency inflow port 26, so that the vacuum state is eliminated.

<motion>
At the initial stage of liquid feeding (initial stage of operation) of the liquid pipe 1, a large amount of air in the liquid pipe 1 first flows into the first flow path 41. Most of the air that has flowed into the first flow path 41 flows to the second exhaust valve 20 side, which has a larger exhaust capacity than the first exhaust valve 10, and is discharged. Therefore, a large amount of air is rapidly discharged at the initial stage of liquid feeding. During liquid transfer (during normal operation) after a large amount of air has been discharged in this way, water flows into the first exhaust valve 10 and the second exhaust valve 20 via the first flow path 41, and therefore, the first exhaust gas. The valve 10 and the second exhaust valve 20 are closed.

At the time of liquid feeding, a small amount of air flows into the first flow path 41. The air that has flowed into the first flow path 41 floats up and reaches the space 44. The air that has reached the space 44 is discharged through the first exhaust valve 10. When the amount of air reaching the space 44 is larger than the amount of air discharged from the first exhaust valve 10, the air is accumulated in the space 44. The air accumulated in the space 44 can stay in the space 44 because the flow toward the second exhaust valve 20 is restricted. Further, the air accumulated in the space 44 can stay in the space 44 more because the flow toward the second exhaust valve 20 is regulated by the protrusion 43. Therefore, the efficiency of discharging air from the first exhaust valve 10 is improved.

If air flows to the second exhaust valve 20 at the time of liquid feeding, the second exhaust valve 20 does not open and the air is not discharged. Then, the air stays in the piping system and the air discharge efficiency deteriorates, which is solved in the present embodiment.

As described above, the exhaust valve unit 100 of the above embodiment includes a first exhaust valve 10, a second exhaust valve 20, an inflow path, and a regulation unit. The first exhaust valve 10 is configured to close when the water in the liquid pipe 1 flows in during liquid feeding and to open the valve when the air in the liquid pipe 1 flows in to discharge the air. The second exhaust valve 20 is configured to exhaust the air of the liquid pipe 1 that flows in at the initial stage of liquid feeding, and then closes the valve with the water of the liquid pipe 1 that has flowed in to maintain the valve closed state. .. The inflow path is connected to the first exhaust valve 10, the second exhaust valve 20, and the liquid pipe 1, and water and air flow in from the liquid pipe 1. The regulation unit is provided in the inflow path and regulates the flow of the air flowing from the liquid pipe 1 toward the second exhaust valve 20 at the time of liquid feeding.

According to the above configuration, a large amount of air in the liquid pipe 1 can be rapidly discharged from the second exhaust valve 20 at the initial stage of liquid feeding. At the time of liquid feeding, the flow of the air flowing into the inflow path toward the second exhaust valve 20 is restricted, so that the air can flow toward the first exhaust valve 10. Therefore, the discharge of air from the first exhaust valve 10 can be promoted, and the air discharge efficiency can be improved.

Further, in the exhaust valve unit 100 of the above embodiment, the first exhaust valve 10 and the second exhaust valve 20 are provided above the liquid pipe 1. The inflow path is formed so as to extend vertically, and is connected to a first flow path 41 connected to the first exhaust valve 10 and the liquid pipe 1, and one end connected to a side portion below the upper end of the first flow path 41. The other end is provided with a second flow path 42 connected to the second exhaust valve 20. The regulating portion has a space 44 above the connecting portion of the first flow path 41 with the second flow path 42.

According to the above configuration, the discharge of air from the first exhaust valve 10 can be promoted by a simple configuration.

Further, the regulating portion has a protrusion 43 that projects downward at the connecting portion of the second flow path 42 with the first flow path 41. According to this configuration, in combination with the space 44, the flow of air toward the second exhaust valve 20 can be further regulated. Therefore, the discharge of air from the first exhaust valve 10 can be further promoted, and the air discharge efficiency can be improved.

(Embodiment 2)
The second embodiment of the present application will be described with reference to FIG. The exhaust valve unit 100 of the present embodiment is such that the configuration of the inflow path and the regulation unit is changed in the first embodiment. Here, the points different from the above-described first embodiment will be mentioned.

The inflow path of the present embodiment is also connected to the first exhaust valve 10, the second exhaust valve 20, and the liquid pipe 1 as in the first embodiment, and water and air flow in from the liquid pipe 1. Specifically, a pipe 50 is connected between the first exhaust valve 10 and the second exhaust valve 20 and the liquid pipe 1. The pipe 50 is integrally formed by can-making welding, and the above-mentioned inflow path is formed. The inflow path has a first flow path 51, a second flow path 52, and a third flow path 53.

The first flow path 51 is a straight flow path extending vertically and is connected to the first exhaust valve 10 and the liquid pipe 1. More specifically, the upper end of the first flow path 51 is connected to the inflow port 12 of the first exhaust valve 10 via the pipe 60. The flow path diameter of the first flow path 51 is larger than the diameter of the inflow port 12 of the first exhaust valve 10 and the pipe diameter of the pipe 60.

The second flow path 52 is a linear flow path extending horizontally and is connected to the first flow path 51. More specifically, one end of the second flow path 52 is connected to a side portion below the upper end of the first flow path 41, and the other end is closed. The third flow path 53 is a straight flow path extending vertically, and is connected to the second flow path 52 and the second exhaust valve 20. More specifically, the third flow path 53 is connected to a portion where one end is closer to the first flow path 51 side than the closed end of the second flow path 52, and the other end is connected to the inflow port 24 of the second exhaust valve 20. It is directly connected.

The regulation part of the present embodiment is substantially the same as the regulation part of the first embodiment in which the protrusion 43 is omitted. That is, the exhaust valve unit 100 has a space 54 as a regulating portion. The space 54 is formed above the connection portion of the first flow path 51 with the second flow path 52. Similar to the first embodiment, this regulation unit regulates the flow of air toward the second exhaust valve 20 side by accumulating the air flowing in from the liquid pipe 1 in the space 54. Other configurations, actions and effects are the same as those in the first embodiment.

(Embodiment 3)
The third embodiment of the present application will be described with reference to FIG. In the exhaust valve unit 100 of the present embodiment, the inflow path is omitted and the configuration of the regulation unit is changed in the first embodiment. Here, the points different from the above-described first embodiment will be mentioned.

The exhaust valve unit 100 of the present embodiment includes a first exhaust valve 10, a second exhaust valve 20, a communication passage 91, and a regulation unit.

The second exhaust valve 20 of this embodiment is directly connected to the liquid pipe 1. That is, in the second exhaust valve 20, the inflow port 24 is connected to the liquid pipe 1. Further, the second exhaust valve 20 is provided with an outflow port 34 instead of the emergency inflow port 26 of the first embodiment. The position of the outflow port 34 in the casing 21 is the same as the position of the emergency inflow port 26 in the first embodiment. That is, the second exhaust valve 20 has two outlets 25 and 34. The configuration of the first exhaust valve 10 is the same as that of the first embodiment.

The communication passage 91 communicates the portion of the flow path 27 of the second exhaust valve 20 below the valve chamber 32 (that is, the inflow port 24 side) with the first exhaust valve 10. Specifically, a pipe 90 is connected between the first exhaust valve 10 and the second exhaust valve 20. The pipe 90 is provided so that the axis extends horizontally. The first exhaust valve 10 is connected to the upper part of the pipe 90. A communication passage 91 is formed in the pipe 90. The communication passage 91 is connected to the outflow port 34 of the second exhaust valve 20 and the inflow port 12 of the first exhaust valve 10.

The regulating portion is provided below the valve chamber 32 in the flow path 27 of the second exhaust valve 20 (that is, on the inflow port 24 side), and the flow of the air flowing in from the liquid pipe 1 toward the valve chamber 32 at the time of liquid feeding is provided. To regulate. Specifically, the exhaust valve unit 100 has a baffle plate 58 as a regulating portion. The baffle plate 58 is formed in the shape of a container with an open lower end. The baffle plate 58 is provided at a portion of the flow path 27 corresponding to the outlet 34. The open area of the lower end of the baffle plate 58 is substantially the same as the flow path area of the flow path 27.

At the initial stage of liquid feeding (initial stage of operation) of the present embodiment, first, a large amount of air in the liquid pipe 1 flows into the flow path 27 of the second exhaust valve 20. Most of the air that has flowed into the flow path 27 wraps around the baffle plate 58 through the outflow port 34 and is discharged from the second exhaust valve 20. Therefore, a large amount of air is rapidly discharged. During liquid transfer (during normal operation) after a large amount of air has been discharged in this way, water flows into the valve chamber 32 and the first exhaust valve 10 through the flow path 27, and therefore, the first exhaust valve 10 and the first exhaust valve 10 2 The exhaust valve 20 is closed.

At the time of liquid feeding, a small amount of air flows into the flow path 27 of the second exhaust valve 20. The air that has flowed into the flow path 27 floats and reaches the inside of the baffle plate 58. That is, the ascending air to the valve chamber 32 is blocked by the baffle plate 58. The amount of air that has reached the inside of the obstacle plate 58 gradually increases and overflows from the obstacle plate 58. The overflowing air flows into the first exhaust valve 10 through the outflow port 34 and the communication passage 91 and is discharged.

In this way, at the time of liquid delivery, the baffle plate 58 regulates the flow of air toward the valve chamber 32. Therefore, also in the present embodiment, it is possible to further promote the discharge of air from the first exhaust valve 10, and it is possible to improve the air discharge efficiency. Other configurations, actions and effects are the same as those in the first embodiment.

The technique disclosed in the present application may have the following configuration for the exhaust valve unit 100 of the above embodiment.

For example, in the exhaust valve unit 100 of the third embodiment, the obstruction plate 58 (regulatory portion) may be formed in a flat plate shape other than the container shape, and has a shape capable of restricting the flow of air toward the valve chamber 32. Anything can be used as long as it is available.

Further, in the exhaust valve unit 100 of each of the above embodiments, a liquid other than water may be targeted, and a gas other than air may be targeted.

The techniques disclosed in this application are useful for exhaust valve units.

1 Liquid piping 1
10 1st exhaust valve 20 2nd exhaust valve 41 1st flow path (inflow path)
42 Second flow path (inflow path)
43 Protrusion (Regulatory part)
44 Space (Regulation Department)
51 First flow path (inflow path)
52 Second flow path (inflow path)
53 Third flow path (inflow path)
54 Space (Regulation Department)
58 Obstruction board (Regulation Department)
100 Exhaust valve unit

Claims (5)

An exhaust valve unit installed in a liquid pipe to which liquid is sent.
A first exhaust valve configured to close the valve when the liquid in the liquid pipe flows in during liquid feeding and open the valve when the gas in the liquid pipe flows in to discharge the gas.
A second exhaust valve configured to discharge the gas of the liquid pipe that flows in at the initial stage of liquid feeding, and then close the valve by the liquid of the liquid pipe that has flowed in to maintain the valve closed state.
An inflow path connected to the first exhaust valve and the second exhaust valve and the liquid pipe, and inflow of liquid and gas from the liquid pipe,
An exhaust valve unit provided in the inflow path and provided with a regulating unit that regulates the flow of gas flowing from the liquid pipe toward the second exhaust valve at the time of liquid feeding. In the exhaust valve unit according to claim 1,
The first exhaust valve and the second exhaust valve are provided above the liquid pipe.
The inflow path is formed so as to extend vertically, and is connected to a first flow path connected to the first exhaust valve and the liquid pipe, and one end connected to a side portion below the upper end of the first flow path. The other end is provided with a second flow path connected to the second exhaust valve.
The exhaust valve unit is characterized in that the restricting portion has a space above the connecting portion of the first flow path with the second flow path. In the exhaust valve unit according to claim 1 or 2.
The first exhaust valve and the second exhaust valve are provided above the liquid pipe.
The inflow path is formed so as to extend vertically, and has a first flow path connected to the first exhaust valve and the liquid pipe, one end connected to a side portion of the first flow path, and the other end. Equipped with a second flow path connected to the second exhaust valve
The exhaust valve unit is characterized in that the restricting portion has a protrusion protruding downward at a connecting portion of the second flow path to the first flow path. An exhaust valve unit installed in a liquid pipe to which liquid is sent.
A first exhaust valve configured to close the valve when the liquid in the liquid pipe flows in during liquid feeding and open the valve when the gas in the liquid pipe flows in to discharge the gas.
It is provided with a casing having an inflow port and an outflow port, a flow path connecting the inflow port and the outflow port, and a valve chamber provided in the flow path, and the inflow port is connected to the liquid pipe. The gas of the liquid pipe that sometimes flows into the inflow port is discharged from the outlet, and then the valve is closed by the liquid of the liquid pipe that has flowed into the inflow port to maintain the valve closed state. The second exhaust valve and
A communication passage for communicating the inflow port side portion of the second exhaust valve with respect to the valve chamber and the first exhaust valve in the flow path.
It is provided on the inflow port side of the flow path of the second exhaust valve with respect to the valve chamber, and includes a regulating unit that regulates the flow of gas flowing in from the liquid pipe toward the valve chamber at the time of liquid feeding. An exhaust valve unit characterized by being In the exhaust valve unit according to claim 4,
The first exhaust valve and the second exhaust valve are provided above the liquid pipe.
The inlet and outlet of the second exhaust valve are provided at the lower and upper parts of the casing, respectively.
The flow path of the second exhaust valve is formed so as to extend vertically.
The exhaust valve unit is characterized in that the regulating portion is formed in the shape of a container having an open lower end.

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