JP6846187B2 - Valve device - Google Patents

Description

The technique disclosed herein relates to a valve device.

Various valve devices have been known conventionally, and one of them is a drain trap.

For example, the drain trap disclosed in Patent Document 1 discharges the inflowing drain while blocking the outflow of the inflowing steam. The drain trap has an orifice member in which an opening through which the drain passes is formed. If the opening is clogged with foreign matter, the drain cannot be drained properly. Therefore, the drain trap is provided with a cleaning mechanism for removing foreign matter from the opening. The cleaning mechanism removes foreign matter from the opening by penetrating the opening through a rod-shaped member.

JP-A-2007-138984

In the cleaning mechanism as described above, it is necessary to appropriately penetrate the opening through a predetermined member. If the penetration by the predetermined member is inappropriate, there is a possibility that the foreign matter in the opening cannot be removed well.

The technique disclosed herein has been made in view of this point, and the purpose thereof is to appropriately remove foreign matter in the opening.

The valve device disclosed herein includes an opening and an orifice member in which a continuous flow path is formed in the opening, and a cleaning mechanism for removing foreign matter in the opening, and the cleaning mechanism is the flow path. A cleaning unit that moves inside, penetrates the opening, and recedes from the opening, a drive unit that drives the cleaning unit, and the cleaning unit with respect to a flow path wall that partitions the flow path. It has a guide for guiding and centering the cleaning portion and the opening.

According to the valve device, foreign matter in the opening can be appropriately removed.

FIG. 1 is a cross-sectional view of the drain trap. FIG. 2 is an enlarged cross-sectional view centered on the cleaning mechanism. FIG. 3 is an enlarged cross-sectional view of the cleaning mechanism in a state where foreign matter is removed from the opening. FIG. 4 is an enlarged cross-sectional view showing an example of a cleaning mechanism when the cleaning unit retracts in a configuration without a guide.

Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of the drain trap 1. FIG. 2 is an enlarged cross-sectional view of the cleaning mechanism 30.

The drain trap 1 is provided in, for example, a steam system, and automatically discharges the drain (condensate) generated by the condensation of steam. As shown in FIG. 1, the drain trap 1 includes a casing 10 which is a closed container, an orifice member 20 which is housed in the casing 10 and has an opening 21 formed therein, a float 18 which opens and closes the opening 21, and an opening. It is provided with a cleaning mechanism 30 for cleaning the portion 21. The drain trap 1 is a so-called float type drain trap. The drain trap 1 is an example of a valve device.

The casing 10 has a main body portion 11 and a bottom portion 12 bolted to the main body portion 11. A valve chamber 13, a drain inflow path 14, and a drain outflow path 15 are formed in the casing 10. In the drain trap 1, the drain flows into the valve chamber 13 from the inflow passage 14 and flows out to the outside through the outflow passage 15.

The valve chamber 13 is partitioned by a main body portion 11 and a bottom portion 12. The inflow path 14 is formed in the main body 11 and communicates with the upper part of the valve chamber 13. An orifice member 20 screwed to the bottom 12 is provided in the lower portion of the valve chamber 13. The outflow passage 15 is formed so as to straddle the main body portion 11, the bottom portion 12, and the orifice member 20.

The orifice member 20 is formed with an opening 21 and a first outflow path 22 continuous with the opening 21. The opening 21 is formed in a circular shape. The first outflow passage 22 communicates with the valve chamber 13 through the opening 21. The first outflow passage 22 extends along the axis X. The axis X of the first outflow path 22 coincides with the center of the opening 21.

Specifically, as shown in FIG. 2, the flow path wall 22a for partitioning the first outflow passage 22 is formed in a cylindrical shape extending along the axis X. The end of the first outflow passage 22 near the opening 21 is formed in a tapered shape in which the inner diameter decreases toward the opening 21.

As shown in FIG. 1, a second outflow passage 16 communicating with the first outflow passage 22 is formed in the main body portion 11 and the bottom portion 12. The first outflow passage 22 and the second outflow passage 16 constitute the outflow passage 15.

A hollow spherical float 18 is provided in the valve chamber 13 in a free state. The float 18 opens and closes the opening 21 and thus the outflow path 15 by taking off and sitting on the orifice member 20. The bottom portion 12 is provided with a float seat 19 with which the float 18 comes into contact with the opening 21 closed. Although only one float seat 19 is shown on the back side in FIG. 1, two float seats 19 are actually provided on the front side and the back side.

The cleaning mechanism 30 automatically removes foreign matter adhering to the opening 21. The cleaning mechanism 30 is provided on the bottom portion 12 and is arranged outside the valve chamber 13. The cleaning mechanism 30 guides the cleaning unit 40 for removing foreign matter from the opening 21, the case 31, the bimetal 32 for driving the cleaning unit 40, and the cleaning unit 40, and is the core of the cleaning unit 40 and the opening 21. It is provided with a guide 50 for taking out.

The case 31 is formed in a substantially cylindrical shape. The case 31 is arranged coaxially with the first outflow path 22. As shown in FIG. 2, a partition wall 31a is formed at the end of the case 31 closer to the first outflow path 22. The partition wall 31a is formed with an insertion hole 31b through which the cleaning portion 40 is inserted and an introduction hole 31c for introducing the drain flowing through the outflow passage 15 into the case 31. The insertion hole 31b is formed substantially in the center of the partition wall 31a. A plurality of introduction holes 31c are formed around the insertion holes 31b. As shown in FIG. 1, an adjusting member 31d is screwed to the end of the case 31 farther from the first outflow path 22. An insertion hole 31e through which the cleaning portion 40 is inserted is formed at substantially the center of the adjusting member 31d.

The bimetal 32 is a temperature-responsive member that deforms in response to temperature. Specifically, the bimetal 32 is a plate-shaped member obtained by adhering two types of metals or alloys having different coefficients of thermal expansion. The bimetal 32 is formed by spirally winding a twisted plate-shaped wire obtained by superimposing two metals or alloys. The bimetal 32 is formed in a coil shape as a whole. When the temperature of the bimetal 32 becomes low, the radius of the spiral becomes small, and the overall length of the bimetal 32 (the length in the axial direction of the spiral) becomes long. On the other hand, when the temperature of the bimetal 32 becomes high, the radius of the spiral becomes large and the overall length of the bimetal 32 becomes short. In this way, the bimetal 32 expands and contracts in the axial direction of the spiral as the temperature changes. The bimetal 32 is an example of a drive unit.

The bimetal 32 is arranged at a position where it is exposed to the fluid that has passed through the orifice member 20. Specifically, the bimetal 32 is housed in the case 31. Since the drain flows into the case 31 through the introduction hole 31c, the bimetal 32 is exposed to the drain. The temperature of the bimetal 32 changes according to the temperature of the drain, and the bimetal 32 expands and contracts accordingly.

The cleaning unit 40 moves in the first outflow path 22, penetrates the opening 21, and recedes from the opening 21. As shown in FIG. 2, the cleaning portion 40 is provided at the cylindrical shaft portion 41 extending along the first outflow path 22 and at the tip of the shaft portion 41, and penetrates the opening 21 to form the opening 21. It has a removing portion 42a for removing foreign matter, and a reducing portion 42b provided on the rear side of the removing portion 42a in a direction penetrating the opening 21 and thinner than the removing portion 42a.

The shaft portion 41 is inserted into the insertion hole 31b of the case 31 and is arranged coaxially with the case 31, that is, coaxially with the first outflow path 22. The tip portion 42 of the shaft portion 41 is exposed from the case 31. The shaft portion 41 is inserted into the bimetal 32 in the case 31. As shown in FIG. 1, the base end portion of the shaft portion 41 is slidably inserted into the insertion hole 31e of the adjusting member 31d. A collar-shaped receiving portion 41a is provided in a portion of the shaft portion 41 inside the case 31. One end of the bimetal 32 is fixed to the receiving portion 41a, while the other end of the bimetal 32 is fixed to the adjusting member 31d (see FIG. 1).

The tip portion 42 of the shaft portion 41 is formed in a substantially truncated cone shape so that the outer diameter increases toward the tip end. The outer diameter of the most tip portion of the tip portion 42 is the largest, and this portion is the removal portion 42a. Of the tip portion 42, the portion formed in a reverse taper shape in which the outer diameter increases toward the tip portion is the reduced portion 42b.

The outer diameter (thickness) of the removing portion 42a is slightly smaller than the inner diameter of the opening 21 of the orifice member 20. The removing portion 42a removes the foreign matter adhering to the opening 21 by penetrating the opening 21 from the first outflow passage 22 side to the valve chamber 13 side. Hereinafter, the moving direction of the removing portion 42a at this time is referred to as a "penetration direction", and the direction opposite to the moving direction is referred to as a "backward direction".

The portion of the shaft portion 41 to which the tip portion 42 is connected is formed in a columnar shape having an outer diameter smaller than that of the other portion of the shaft portion 41.

The guide 50 includes two protrusions 51 that protrude from the cleaning portion 40 and slide with respect to the flow path wall 22a. Specifically, the two protrusions 51 are composed of one columnar pin 52. The pin 52 is immovably fitted (that is, fixedly fitted) to a hole formed through the shaft portion 41 in the radial direction. The pin 52 penetrates the shaft portion 41 in the radial direction, and both ends of the pin 52 project in the radial direction from the outer peripheral surface of the shaft portion 41. That is, both ends of the pin 52 form two protrusions 51. The two protrusions 51 are arranged at positions offset by 180 degrees with respect to the axis Y of the shaft portion 41. The amount of protrusion of the two protrusions 51 from the outer peripheral surface of the shaft portion 41 is substantially the same. The tip of each protrusion 51 is formed in a substantially hemispherical shape and is rounded. The distance from the tip of one protrusion 51 to the tip of the other protrusion 51 (that is, the total length of the pin 52) is substantially the same as the inner diameter of the first outflow path 22. The protrusion 51 slides with respect to the flow path wall 22a of the first outflow passage 22 when the cleaning portion 40 moves.

The operation of the drain trap 1 configured in this way will be described.

The float 18 is seated on the orifice member 20 when there is no or little drain in the casing 10, such as when starting a steam system in which the drain trap 1 is installed. That is, the opening 21 is closed.

When the steam system is started from this state, drainage starts to flow into the casing 10 from the inflow path 14. The drain that has flowed into the casing 10 accumulates in the lower part of the valve chamber 13. When the amount of drain stored in the valve chamber 13 increases, the float 18 floats and separates from the orifice member 20. As a result, the opening 21 is opened and the outflow path 15 is opened. The drain flows out through the outflow channel 15.

On the other hand, when steam flows into the casing 10 from the inflow passage 14, the steam stays in the upper part of the valve chamber 13, while the drain of the valve chamber 13 flows out from the outflow passage 15 and decreases. Eventually, the float 18 sits on the orifice member 20. In this way, the opening 21 is closed and the discharge of steam from the casing 10 is prevented.

In this way, the drain trap 1 passes the inflowing drain and causes it to flow out, while blocking the outflow of the inflowing steam.

Subsequently, the operation of the cleaning mechanism 30 will be described. FIG. 3 is an enlarged cross-sectional view of the cleaning mechanism 30 in a state where foreign matter is removed from the opening 21. FIG. 4 is an enlarged cross-sectional view showing an example of a cleaning mechanism 30 when the cleaning unit 40 retracts in a configuration without a guide.

As described above, when the drain flows out from the casing 10, a part of the drain flowing through the outflow passage 15 flows into the case 31 of the cleaning mechanism 30 through the introduction hole 31c. Since this drain has a relatively high temperature, the bimetal 32 in the case 31 also has a relatively high temperature. The bimetal 32 is in a relatively contracted state, and the cleaning portion 40 is located at a position retracted from the opening 21 of the orifice member 20. Specifically, the removing portion 42a is located in the first outflow passage 22. In this state, the drain can circulate in the first outflow channel 22.

As the drain trap 1 continues to be used, foreign matter may eventually accumulate in the opening 21 of the orifice member 20. When foreign matter is deposited on the opening 21 and the drain hardly or hardly flows out from the opening 21, the bimetal 32 is not exposed to the drain and the bimetal 32 becomes relatively low temperature. Then, the bimetal 32 extends, the cleaning portion 40 advances toward the opening 21, and the tip portion 42 penetrates the opening 21 as shown in FIG. At this time, the removing portion 42a removes the foreign matter adhering to the opening 21.

The foreign matter is usually stuck to the edge of the opening 21. If the removing portion 42a is too thin with respect to the opening 21, the removing portion 42a will be used only for the portion of the foreign matter adhering to the opening 21 through which the removing portion 42a has passed, or only a portion through which the removing portion 42a has passed and a small portion around it. Is removed, and foreign matter may remain on the edge of the opening 21. On the other hand, since the outer diameter of the removing portion 42a is set to be slightly smaller than the inner diameter of the opening 21, it is possible to remove foreign matter near the edge of the opening 21 by penetrating the foreign matter by the removing portion 42a. It can, and by extension, even the foreign matter stuck to the edge can be peeled off.

Here, when the cleaning mechanism 30 penetrates the opening 21 through the cleaning portion 40, the cleaning mechanism 30 penetrates the tip portion 42 up to the reduced portion 42b from the opening portion 21. If the removing portion 42a stays in the opening 21, it becomes difficult for the cleaning portion 40 to retreat to the original position after penetrating the opening 21. Specifically, as described above, after penetrating the opening 21, the cleaning unit 40 retreats to the original position when the outflow of drain from the opening 21 is resumed and the bimetal 32 becomes hot. However, when the removing portion 42a stays in the opening 21, the gap between the opening 21 and the removing portion 42a is small, so that drain hardly flows out from the opening 21. As a result, the bimetal 32 does not easily reach a high temperature, and the cleaning unit 40 does not retract. On the other hand, since the outer diameter of the reduced portion 42b is sufficiently smaller than that of the opening 21, the gap between the opening 21 and the cleaning portion 40 becomes large when the reduced portion 42b protrudes from the opening 21. As a result, a sufficient drainage distribution area in the opening 21 can be secured even when the cleaning portion 40 penetrates the opening 21. As a result, after removing the foreign matter in the opening 21, the drain flows out of the opening 21 again, and the bimetal 32 is exposed to the high temperature drain again. The temperature of the bimetal 32 rises again, the bimetal 32 contracts, and the cleaning portion 40 recedes from the opening 21.

When the cleaning mechanism 30 operates in this way, the guide 50 guides the cleaning unit 40. The guide 50 guides the cleaning unit 40 to the flow path wall 22a of the first outflow passage 22 to center the cleaning unit 40 and the opening 21.

Specifically, the protrusion 51 slides against the flow path wall 22a while the cleaning portion 40 moves forward and backward. Since the distance between the tips of the two protrusions 51 is substantially the same as the inner diameter of the first outflow path 22, and the amount of protrusion of the two protrusions 51 from the shaft 41 is substantially the same, the shaft 41 is a pin. It is positioned substantially in the center of the first outflow path 22 in the axial direction of 52. In addition, the two protrusions 51 are arranged at positions 180 degrees different from each other around the axis Y of the shaft portion 41, and the distance between the tips of the two protrusions 51 is approximately one to the inner diameter of the first outflow path 22. Therefore, the shaft portion 41 is positioned substantially at the center of the first outflow path 22 even in the axial direction of the pin 52 and the direction orthogonal to the axial center Y of the shaft portion 41. In this way, the axis Y of the shaft portion 41 is positioned so as to substantially coincide with the axis X of the first outflow path 22. Since the axis X of the first outflow path 22 coincides with the center of the opening 21, the axis Y of the shaft 41 substantially coincides with the center of the opening 21. In this way, the shaft portion 41 can be positioned in the two axial directions, that is, in the plane orthogonal to the axis Y of the shaft portion 41, even with only the two protrusions 51.

When the axis Y of the cleaning portion 40 and the center of the opening 21 substantially coincide with each other, foreign matter stuck to the edge of the opening 21 can be evenly removed. If the axis Y of the cleaning portion 40 and the center of the opening 21 deviate from each other, the foreign matter stuck to the edge of the opening 21 will be removed in a biased manner, and the foreign matter tends to remain on a part of the edge. Become. On the other hand, if the axis Y of the cleaning portion 40 and the center of the opening 21 are substantially aligned with each other, the cleaning portion 40 penetrates substantially the center of the opening 21, so that a foreign substance stuck to the edge of the opening 21 Can be removed as uniformly as possible.

In addition, by substantially aligning the axis Y of the cleaning portion 40 with the center of the opening 21, the cleaning portion 40 can be smoothly retracted after penetrating. Specifically, since the cleaning mechanism 30 advances the cleaning unit 40 until the reduced portion 42b protrudes from the opening 21, a portion thicker than the reduced portion 42b protrudes from the opening 21. If the axis Y of the cleaning portion 40 and the center of the opening 21 are deviated from each other, the tip portion 42 may be caught in the opening 21 when the cleaning portion 40 retracts, as shown in FIG. As a result, the cleaning unit 40 may not be properly retracted to its original position, and as a result, the distribution area of the opening 21 may not be sufficiently secured. On the other hand, by substantially aligning the axis Y of the cleaning unit 40 with the center of the opening 21, it is possible to prevent the tip 42 from being caught in the opening 21 when the cleaning unit 40 is retracted, and the cleaning unit 40 can be prevented from being caught in the opening 21. Can be smoothly retreated.

Since the cleaning unit 40 is inserted into the insertion hole 31b of the case 31, it is positioned to some extent by the insertion hole 31b. However, since the insertion hole 31b is separated from the opening 21, the positioning accuracy at the tip portion 42 is not high. On the other hand, since the guide 50 guides the cleaning unit 40 with respect to the flow path wall 22a of the first outflow path 22 adjacent to the opening 21, the cleaning unit 40 can be accurately positioned with respect to the opening 21. it can.

As described above, the drain trap 1 includes the orifice member 20 in which the opening 21 and the first outflow path 22 (flow path) continuous with the opening 21 are formed, and the cleaning mechanism 30 for removing foreign matter in the opening 21. The cleaning mechanism 30 is formed in a rod shape extending along the first outflow path 22, has a cleaning portion 40 penetrating the opening 21 and retreating from the opening 21, and a bimetal 32 (bimetal 32) for driving the cleaning portion 40. It has a drive unit) and a guide 50 that guides the cleaning unit 40 to the flow path wall 22a that partitions the first outflow path 22 and centers the cleaning unit 40 and the opening 21.

According to this configuration, by guiding the cleaning portion 40 with the guide 50, the cleaning portion 40 and the opening 21 can be centered, so that foreign matter in the opening 21 can be appropriately removed. At this time, since the guide 50 guides the cleaning unit 40 with reference to the flow path wall 22a of the first outflow path 22 adjacent to the opening 21, the cleaning unit 40 can be guided relatively close to the opening 21. it can. As a result, the cleaning portion 40 and the opening portion 21 can be centered with high accuracy. As a result, foreign matter in the opening 21 can be appropriately removed.

Further, the cleaning unit 40 is provided with a shaft portion 41 extending along the first outflow path 22 and a removing portion 42a provided on the shaft portion 41 to remove foreign matter in the opening 21 by penetrating the opening 21. It has a reduced portion 42b which is provided on the rear side in the direction of penetrating the opening 21 from the portion 42a and is thinner than the removing portion 42a, and the cleaning mechanism 30 has a cleaning mechanism 30 when penetrating the opening 21 through the cleaning portion 40. It penetrates up to the reduced portion 42b.

According to this configuration, after the cleaning unit 40 removes the foreign matter from the opening 21, a portion thicker than the reduced portion 42b, that is, the removing portion 42a protrudes from the opening 21. Therefore, when the cleaning portion 40 retracts, the tip portion 42 may be caught in the opening portion 21. On the other hand, since the cleaning portion 40 and the opening portion 21 are centered by the guide 50, the cleaning portion 40 can be smoothly retracted without the tip portion 42 being caught in the opening portion 21.

The guide 50 includes a plurality of protrusions 51 that protrude from the cleaning portion 40 and slide with respect to the flow path wall 22a.

According to this configuration, the protruding portion 51 protruding from the shaft portion 41 slides with the flow path wall 22a, so that a gap is formed between the shaft portion 41 and the flow path wall 22a in a portion other than the protruding portion 51. Will be done. Therefore, even in the configuration in which the shaft portion 41 is guided with respect to the flow path wall 22a, a sufficient drain flow area can be secured between the shaft portion 41 and the flow path wall 22a.

Further, the flow path wall 22a is formed in a cylindrical shape extending along the axis X of the first outflow path 22, and the protruding portions 51 are located at at least two locations offset by 180 degrees with respect to the axis Y of the cleaning portion 40. It is provided.

According to this configuration, at least two protrusions 51 are arranged on the diameter of the flow path wall 22a. Therefore, the shaft portion 41 is positioned not only in the direction in which the two protrusions 51 are lined up, but also in the direction in which the two protrusions 51 are lined up and in the direction orthogonal to both the axis Y of the shaft portion 41.

Further, the bimetal 32 is formed of a temperature-responsive member that deforms according to the temperature of the drain (fluid) flowing through the orifice member 22 to move the cleaning portion 40, and is exposed to the fluid that has passed through the orifice member 20. Have been placed.

According to this configuration, the cleaning unit 40 is automatically advanced and retracted according to the temperature of the drain flowing through the orifice member 22. When the cleaning unit 40 is manually or electrically driven, even if the tip portion 42a is caught in the opening 21 when retracting, there is a possibility that the catching can be eliminated by increasing the force for retracting the cleaning unit 40. There is. However, when the cleaning unit 40 is driven by a temperature-responsive member such as a bimetal 32, the driving force of the cleaning unit 40 is determined by the performance of the temperature-responsive member, and it is difficult to increase it as needed. Therefore, in a configuration in which the cleaning unit 40 is driven by a temperature-responsive member, it is particularly effective to center the cleaning unit 40 and the opening 21.

<< Other Embodiments >>
As described above, the above-described embodiment has been described as an example of the technology disclosed in the present application. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate. It is also possible to combine the components described in the above embodiment to form a new embodiment. In addition, among the components described in the attached drawings and detailed explanations, not only the components essential for problem solving but also the components not essential for problem solving in order to illustrate the above-mentioned technology. Can also be included. Therefore, the fact that these non-essential components are described in the accompanying drawings or detailed description should not immediately determine that those non-essential components are essential.

The embodiment may have the following configuration.

For example, the drain trap 1 is not limited to a steam trap that blocks the discharge of steam, but may be an air trap that blocks the discharge of air, a gas trap that blocks the discharge of gas, or the like.

Further, the technique disclosed herein is not limited to the drain trap 1, and can be applied to any valve device that controls the flow of gas or liquid as a fluid.

The guide 50 has two protrusions 51, but the number of protrusions 51 is not limited to two. For example, the number of protrusions 51 may be 3 or more. Further, the guide 50 may be composed of a member other than the protruding portion 51.

The drive unit that drives the cleaning unit 40 is not limited to the bimetal 32. The cleaning unit 40 may be driven manually. Further, the cleaning unit 40 may be electrically driven by an electric motor or the like.

As described above, the techniques disclosed herein are useful for valve devices.

1 Drain trap (valve gear)
20 Orifice member 21 Opening 22 First outflow path (flow path)
22a Flow path wall 30 Cleaning mechanism 32 Bimetal (drive unit)
40 Cleaning part 41 Shaft part 42a Removal part 42b Reduction part 50 Guide 51 Protruding part X Axial center of the first outflow path (Axial center of the flow path)
Y The axis of the cleaning section

Claims (5)

An orifice member having an opening and a continuous flow path formed in the opening,
A cleaning mechanism for removing foreign matter from the opening is provided.
The cleaning mechanism
A cleaning portion formed in a rod shape extending along the flow path, penetrating the opening, and retreating from the opening.
The drive unit that drives the cleaning unit and
A valve device having a guide for guiding the cleaning portion with respect to a flow path wall for partitioning the flow path to center the cleaning portion and the opening. In the valve device according to claim 1,
The cleaning portion includes a shaft portion extending along the flow path, a removing portion provided on the shaft portion and removing foreign matter in the opening by penetrating the opening, and the opening rather than the removing portion. It is provided on the rear side in the direction of penetrating the portion, and has a reduced portion thinner than the removed portion.
The cleaning mechanism is a valve device characterized in that when the opening is penetrated through the cleaning portion, the cleaning mechanism is penetrated to the reduced portion. In the valve device according to claim 1 or 2.
The valve device is characterized in that the guide includes a plurality of protruding portions that protrude from the cleaning portion and slide with respect to the flow path wall. In the valve device according to claim 3,
The flow path wall is formed in a cylindrical shape extending along the axis of the flow path.
The valve device is characterized in that the protruding portions are provided at at least two locations deviated by 180 degrees from the axis of the cleaning portion. In the valve device according to any one of claims 1 to 4.
The drive unit is formed of a temperature-responsive member that deforms according to the temperature of the fluid flowing through the orifice member to move the cleaning unit, and is arranged at a position exposed to the fluid that has passed through the orifice member. A valve device characterized by that.

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