Valve device

Abstract

To further improve the cooling performance of a valve body in a valve device.SOLUTION: A valve device is equipped with a valve box 2 provided in a fluid supply path 10, a valve body 20 that moves forward / backward in the valve box 2 to open / close the fluid supply path 10, a refrigerant passage 32 that is provided in the valve body 20 and in which a refrigerant supplied from the outside of the valve box 2 circulates, a hood 5 that stores the valve body 20 in an opening-valve state, a valve seat 45 that is provided in the valve box 2 and on which a peripheral edge portion of the valve body 20 in a closing-valve state abuts, and a space A that suppress the transmission of heat from the fluid supply path 10 side to the valve body 20 in the opening-valve state, between an end portion 20a on the fluid supply path 10 side of the valve body 20 in the opening-valve state and the valve seat 45.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a valve device provided in a high-temperature fluid supply passage. [Background technology]

[0002] An example of a valve device installed in a high-temperature fluid supply passage is described in Patent Document 1. This valve device is a gate valve with a cooling structure, and a valve element that opens and closes the passage is attached to a housing consisting of a valve box and a bonnet (referred to as a cap portion in Patent Document 1) that can move up and down. The bonnet serves as a space to accommodate the valve element when in the open position.

[0003] The valve body consists of two circular steel valve plates connected by a pair of spiral plates that form a cooling water flow path from the center to the outer periphery. An annular seat ring is welded to the outer periphery of these connected valve plates.

[0004] The seat ring has a peripheral wall provided with a water inlet and a water outlet for cooling water supplied to the cooling water flow path, and a pair of hollow valve stems are connected in parallel to the water inlet and the water outlet. The upper part of the valve stem has a water inlet and an outlet, respectively. The cooling water is supplied from the inlet, passes through the interior of the valve stem, enters the spiral cooling water flow path inside the seat ring through the water inlet, passes through the center of the valve disc, passes through the inside of the valve stem, and is discharged from the outlet. This allows the entire valve disc to be uniformly cooled.

[0005] Also known is the valve gear described in Patent Document 2. This valve gear opens and closes a hot blast pipe leading to a blast furnace, and includes a valve plate that can be raised and lowered inside a housing consisting of a valve body and a bonnet, and an annular air cooling passage adjacent to a seal valve seat that the valve plate contacts and separates from. The air cooling passage is connected to a cooling air source. Cooling air supplied from the cooling air source passes through the air cooling passage and is supplied to the housing interior space through a cooling gap that opens into the sealing surface of the seal valve seat. In the closed valve state, the cooling gap of the seal valve seat is closed by the valve plate. This interrupts the inflow of cooling air into the housing interior space, allowing the seal valve seat to be cooled (see lines 1 to 8 on the bottom left of page 2 of Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-262286 [Patent Document 2] Japanese Patent Application Publication No. 60-132191 Summary of the Invention [Problem to be solved by the invention]

[0007] In the valve device of Patent Document 2, in the open state, the valve disc (valve plate) is separated from the sealing valve seat, so the cooling gap is opened and cooling air flows into the housing. At this time, the valve disc is pulled up inside the bonnet (cover) provided on the top of the valve box, so the cooling air ejected from the cooling gap does not directly hit the valve plate.

[0008] However, depending on the type of fluid handled in the hot air pipeline and the specifications of the facility, there is a demand for an even greater cooling effect on the valve plate, which requires more efficient cooling of the valve plate in both the closed and open valve states.

[0009] SUMMARY OF THE INVENTION It is therefore an object of the present invention to further improve the cooling performance of the valve body in a valve device provided in a high-temperature fluid supply passage. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides a valve device comprising: a valve box provided in a fluid supply passage; a valve element that opens and closes the fluid supply passage by moving back and forth within the valve box; a refrigerant passage provided within the valve element through which refrigerant supplied from outside the valve box flows; a bonnet that accommodates the valve element in an open valve state; a valve seat provided in the valve box against which the peripheral edge of the valve element in a closed valve state abuts; and a space between the valve seat and the end of the valve element on the fluid supply passage side in the open valve state, which prevents heat from the fluid supply passage side from being transferred to the valve element in the open valve state.

[0011] In addition, a configuration can be adopted that includes a first cooling gas supply section that sprays cooling gas supplied from outside the valve box into the space through a first spray passage provided on the bonnet side of the valve seat.

[0012] Further, a configuration may be adopted in which the cooling gas jetted out from the first jet passage is jetted in a direction perpendicular to the direction of the advancement and retreat of the valve body.

[0013] In each of these aspects, a configuration can be adopted in which a guide is provided on the bonnet side of the space to restrict movement of the valve body in a direction perpendicular to the direction of advancement and retreat.

[0014] Here, a configuration can be adopted which includes an annular passage inside the valve box arranged circumferentially along the valve seat, and a second cooling gas supply section which supplies cooling gas supplied from outside the valve box into the valve box through a second ejection passage drawn out from the annular passage inside the valve box.

[0015] In addition, in each of these aspects, a configuration can be adopted in which the fluid supply passage on either axial side of the valve body is hotter than the fluid supply passage on the opposite side, the first ejection passage is positioned on the opposite side of the valve body, and a third cooling gas supply section is provided that ejects cooling gas supplied from outside the valve box into the fluid supply passage on the one side of the valve body. [Effects of the Invention]

[0016] The present invention can further improve the cooling performance of the valve plate in a valve device provided in a high-temperature fluid supply passage. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is an enlarged longitudinal sectional view showing a main part of an embodiment of the present invention. [Figure 2] FIG. [Figure 3] Right side view of Figure 2 (however, the valve disc is shown in the open state) [Figure 4] Enlarged view of the main part of Figure 1 DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of the present invention will be described with reference to Figures 1 to 4. In this embodiment, the configuration of the present invention will be described using, as an example, a valve device 1 provided in a pipeline 10 for supplying a thermal fluid (hereinafter referred to as a fluid supply path 10) leading to a blast furnace.

[0019] As shown in FIG. 1, the valve device 1 is configured as a gate valve, with a valve box 2 provided midway through a fluid supply line 10 and a valve disc 20 that can move back and forth within the valve box 2. The fluid supply line 10 is opened and closed as the valve disc 20 moves back and forth within the valve box 2. In FIG. 1, the left side is the upstream side and the right side is the downstream side. A valve box valve seat 45 is provided upstream of the valve disc 20 within the valve box 2, and comes into contact with and separates from a valve disc seat portion 34 provided on the periphery of the valve disc 20. The valve disc seat portion 34 and the valve box valve seat 45 (hereinafter simply referred to as the valve seat 45) are each annular, and abut against each other over their entire circumference in the closed valve state. In addition, an annular guide ring 7 is provided downstream of the valve disc 20 within the valve box 2. The guide ring 7 faces the valve disc seat portion 34 of the valve disc 20 in the closed valve state. Hereinafter, the direction parallel to the axis of the linear fluid supply channel 10 will be referred to as the axial direction, and the direction perpendicular to the axis will be referred to as the radial direction.

[0020] When the valve is closed, the peripheral edge of the valve element 20 is pressed against the valve seat 45 by a force from the downstream side where the pressure is relatively high. For this reason, in this embodiment, a one-sided valve seat is used, in which the valve seat 45 is provided only on the upstream side. However, depending on the application of the valve device 1, the valve seats 45 may be provided on both the upstream and downstream sides. In this case, the guide ring 7 on the downstream side can be omitted.

[0021] The inner surface of the fluid supply passage 10 in the valve box 2, except for the space into which the valve disc 20 enters, is covered with refractories 13, 14 made of a material that can withstand high heat and has heat retention properties. The refractory 13 is arranged on the inner surface of the passage 11 on the upstream side of the valve disc 20, and the refractory 14 is arranged on the inner surface of the passage 12 on the downstream side. A recess 8 into which the valve disc 20 enters is provided between the upstream passage 11 and the downstream passage 12. The inner surface of the recess 8 is also covered with a similar refractory 15. Reference numeral 9 in FIGS. 1 to 3 denotes a drain, and reference numeral 9a in FIGS. 2 and 3 denotes a drain valve.

[0022] The valve box 2 is provided at its top with a hollow mounting portion 3 that protrudes outward beyond the outer surface of the cylindrical body that constitutes the fluid supply passage 10. Furthermore, a cover member 4 is attached to the top of the mounting portion 3 via flanges 3a, 4a. The valve box 2 (including the mounting portion 3) and the cover member 4 together constitute a housing H. The interior of the mounting portion 3 and the cover member 4 also function as a bonnet 5 that houses the valve element 20 in the open state. The inner surfaces of the mounting portion 3 and the cover member 4 are also covered with a refractory material 16, similar to the interior of the fluid supply passage 10. Hereinafter, the valve box 2 and the cover member 4 will be collectively referred to as the housing H.

[0023] A valve stem 6 is attached to the valve element 20. The valve stem 6 extends upward within the bonnet 5 and is pulled out to the outside of the housing H. The valve stem 6 is driven by a drive device, so that the valve element 20 moves back and forth along the axial direction of the valve stem 6. That is, the valve element 20 moves to one side (down) along the axial direction of the valve stem 6 to close the valve, and moves to the other side (up) to open the valve.

[0024] A refrigerant passage 32 through which a refrigerant supplied from outside the housing H flows is provided within the valve disc 20. As shown in Fig. 1, the valve disc 20 includes two metal (steel) valve plates 24, 25 on the front and rear sides, which sandwich the refrigerant passage 32 located in the center in the thickness direction. The outside of the upstream valve plate 24 is covered with a refractory material 21, and the outside of the downstream valve plate 25 is covered with a refractory material 22. An annular seat ring 27 is attached to the outer periphery of the valve disc 20, and the end face of the seat ring 27 forms a valve seat portion 34 of the valve disc.

[0025] A pair of spiral plates are disposed in the disk-shaped space sandwiched between the valve plates 24, 25 and the seat ring 27. The spiral plates form a single refrigerant passage 32 that runs from a supply port provided on the outer periphery of the valve plates 24, 25 toward the center, and then from the center to a discharge port provided on the outer periphery.

[0026] The supply port and the discharge port are connected to a pair of refrigerant passages 31 provided in each of the two valve stems 6, respectively. The pair of refrigerant passages 31 are connected to a refrigerant supply source (not shown). The refrigerant supplied from the refrigerant supply source passes through the refrigerant passage 31 inside one of the valve stems 6, enters the refrigerant passage 32 from the supply port, passes through the center of the valve element 20, and then returns from the discharge port through the refrigerant passage 31 inside the other valve stem 6 to the refrigerant supply unit 30, thereby forming a refrigerant supply section. The valve element 20 is cooled by this refrigerant supply unit 30. In this embodiment, air is used as the refrigerant handled by the refrigerant supply unit 30, but a refrigerant made of a gas other than air, or a refrigerant made of a liquid, may also be used.

[0027] Furthermore, the valve device 1 has a space A between the end (bottom) 20a of the valve element 20 on the fluid supply path 10 side in the open state and the valve seat 45, which suppresses heat transfer from the fluid supply path 10 side to the valve element 20 in the open state. That is, as shown in FIGS. 3 and 4 , the end 20a of the valve element 20 on the fluid supply path 10 side in the open state is located closer to (higher than) the bonnet 5 than the valve seat 45 in the valve box 2, and is also located closer to (higher than) the bonnet 5 than the guide ring 7. The presence of the space A that suppresses heat transfer between the valve seat 45 and the end 20a of the valve element 20 increases the distance between the valve element 20 and the fluid supply path 10, thereby reducing thermal stress in the valve element 20, particularly thermal stress at the bottom 20a of the valve element 20. That is, the space A functions as a thermal buffer space between the fluid supply path 10 side and the mounting portion 3 and bonnet 5 side.

[0028] The valve device 1 also includes a first cooling gas supply unit 60 that sprays cooling gas supplied from outside the valve box 2 and the bonnet 5, i.e., from outside the housing H, into the space A within the valve box 2 through a first ejection passage 62 (hereinafter referred to as a first opening 62 in the embodiment) provided on the bonnet 5 side of the valve seat 45. In this embodiment, the first cooling gas supply unit 60 introduces cooling gas supplied from the gas supply source 50 through a communication passage 51 into an introduction passage 61 provided on the bonnet 5 side of the fluid supply path 10, and the introduced gas is ejected into the valve box 2 through the first opening 62, as shown in FIG. 4. A flow rate adjustment valve 64 is provided in the communication passage 51, so that the amount of gas ejected can be adjusted and the ejection can be stopped when not required.

[0029] In this way, by providing the first cooling gas supply unit 60 that sprays the cooling gas into the space A, the cooling gas forms an air layer, i.e., an air curtain, that separates the space in the fluid supply path 10 from the inside of the bonnet 5. The formation of such an air layer improves the cooling performance of the valve body 20 in the open state (including reduction in the thermal influence from the thermal fluid). In addition, the amount of heat received by the bottom 20a of the valve body 20 can be reduced.

[0030] It is desirable that the first opening 62 be open and face the space A. For this reason, it is desirable that the distance w1 between the end (top) 20b of the valve disc 20 on the bonnet 5 side in the closed state and the end (bottom) 20a of the valve disc 20 on the bonnet 5 side in the open state be set larger than the distance w1 between the end (top) 20b of the valve disc 20 on the bonnet 5 side in the closed state and the second opening 62 (see FIG. 4). In this embodiment, the cooling gas is ejected from the first opening 62 in a direction perpendicular to the direction of advancement and retreat of the valve disc 20 and parallel to the flow direction of the fluid supply path 10. However, the angle of this ejection direction can be adjusted as long as an air layer is formed that separates the space in the fluid supply path 10 from the space in the bonnet 5. However, it is desirable that the ejection direction be a direction that intersects the direction of advancement and retreat of the valve disc 20.

[0031] As described above, by providing the space A between the valve seat 45 and the end 20a of the valve element 20 to suppress heat transfer, the distance between the valve element 20 and the fluid supply path 10 can be increased, but this increases the distance the valve element 20 moves in the forward and backward directions during valve opening and closing operations. Generally, the range of movement of the valve element 20 in the forward and backward directions is set so that the valve element valve seat portion 34 on the valve element 20 side does not separate from the valve seat 45 on the valve box 2 side. This is because if the valve element valve seat portion 34 separates from the valve seat 45 in the open state, the end 20a of the valve element 20 may interfere with the valve seat 45 when the valve element 20 moves in the valve closing direction, potentially hindering the opening and closing of the valve element 20. Furthermore, if the movement distance of the valve element 20 becomes long, the amplitude of the swing of the valve element 20 (the amplitude of the swing of the valve element 20 in the front and back directions) during the opening and closing operation of the valve may become large. This is because the valve stem 6 connected to the valve element 20 is supported at the top of the bonnet 5. If the amplitude of the swing of the valve element 20 is large, the valve element 20 may hit the valve seat 45 during the valve closing operation. For this reason, in this embodiment, a guide 70 is provided on the bonnet 5 side of the space A in the housing H, which restricts the movement of the valve element 20 in a direction perpendicular to the opening and closing direction (the direction in which the valve stem 6 moves forward and backward) and in a direction parallel to the flow direction of the fluid supply path 10.

[0032] The guide 70 is composed of a pair of plate-like members attached within the mounting portion 3. As shown in FIG. 4 , the distance L1 between the plate surfaces 70a, 70a of the pair of plate-like members is set to be slightly larger than the maximum width L2 of the valve disc 20 in the front-to-back direction. Therefore, the front and back surfaces of the valve disc 20 are restrained by the plate surfaces 70a, 70a, thereby restricting the swing of the valve disc 20. The provision of the guide 70 can prevent the end 20a of the valve disc 20 from interfering with the valve seat 45 when the valve disc 20 moves in the valve closing direction. The guide 70 is not limited to the plate-like member described above, and may be a member of various shapes that faces the front and back surfaces of the valve disc 20. For example, the guide 70 may be a ridge, rail, or the like that extends in the opening and closing direction of the valve disc 20, i.e., the forward and backward direction of the valve stem 6. The guide 70 may also be attached to the inside of the cover member 4, in addition to or instead of the mounting portion 3.

[0033] The valve device 1 also has a second cooling gas supply section 40 that supplies cooling gas supplied from a gas supply source 50 located outside the valve box 2 and the bonnet 5, i.e., outside the housing H, into the valve box 2 through a second ejection passage 44 (hereinafter referred to as the second opening 44 in the embodiment), which is a cooling gap provided in the valve seat 45.

[0034] As shown in FIG. 1 , the second cooling gas supply unit 40 is connected to a gas supply source 50 via a communication passage 51, and the cooling gas is introduced into an annular passage (second annular passage) 43 provided in the valve box 2 via an annular introduction passage (first annular passage) 46 provided along the outer periphery of the fluid supply path 10. The second opening 44 is drawn out from the annular passage 43 in the valve box. The annular introduction passage 46 is located radially outward of the annular passage 43 in the valve box, and the two are connected by a connecting passage 47 extending radially. In this embodiment, the annular introduction passage 46 is provided integrally with the valve box 2, but it may be separate from the valve box 2. In this embodiment, air is used as the cooling gas, but gases other than air may be used.

[0035] Cooling gas supplied from a gas supply source 50 is introduced into the annular introduction passage 46 through gas inlets 49 connected to communication passages 51. A plurality of gas inlets 49 are provided around the axis of the fluid supply passage 10, ensuring smooth gas supply to the annular introduction passage 46. A pressure-regulating damper 48 is provided at the connection between the annular introduction passage 46 and the gas inlets 49, ensuring that the pressure inside the annular introduction passage 46 is maintained above a certain level. A plurality of connecting passages 47 connecting the annular introduction passage 46 and the valve body annular passage 43 are also provided around the axis of the fluid supply passage 10, ensuring smooth gas supply from the annular introduction passage 46 to the valve body annular passage 43. These configurations ensure a stable supply of cooling gas to the valve body annular passage 43. The pressure adjustment damper 48 is equipped with, for example, blades or an opening / closing plate that opens to the downstream side (the annular introduction passage 46 side) when the pressure on the upstream side (the gas introduction port 49 side) exceeds a certain level.

[0036] The valve seat 45 is a hollow annular member, the interior of which forms the valve body annular passage 43, a passage for cooling gas. The second opening 44 is drawn from the valve body annular passage 43. The cooling gas is supplied into the valve body 2 through the second opening 44 and provides cooling for the valve disc 20 and various components of the valve body 2. If the cooling gas were introduced into a simple circulation-type cooling device without the second opening 44, the temperature of the cooling gas would quickly rise, potentially making it impossible to maintain cooling performance. This is because gas refrigerants tend to increase in temperature more easily than liquid refrigerants. In contrast, in this embodiment, the cooling gas is released through the second opening 44, and cooling gas is continuously supplied from the gas supply source 54 into the valve body annular passage 43 to replenish it. This allows for improved cooling performance for the valve seat 45 while using a gas refrigerant.

[0037] Furthermore, both the annular introduction passage 46 and the annular passage 43 within the valve box 2 are located upstream of the valve box 2, and this upstream position is blocked from hot air by the valve seat 45 when the valve is closed. Therefore, when the downstream side is relatively hotter than the upstream side, the thermal influence from the hotter downstream side is reduced. Furthermore, the cooling gas flows in the same direction as and generally parallel to the flow direction of the thermal fluid in the fluid supply path 10, forming an air layer (air curtain) separating the space within the fluid supply path 10 from the space within the bonnet 5. This is thought to be because the cooling gas is drawn by the flow of the thermal fluid in the fluid supply path 10, forming an air layer with a lower temperature than the thermal fluid between the space within the fluid supply path 10 and the space within the bonnet 5. The formation of such an air layer improves the cooling performance (including reduction of thermal influence from the thermal fluid) of the guide ring 7 (or the downstream valve seat 45 if the guide ring 7 is not provided). Here, the aforementioned first cooling gas supply section 60 forms an air layer through the first opening 62, thereby exhibiting a high heat insulation effect, and the second cooling gas supply section 40 also has the function of forming an air layer.

[0038] The second openings 44 may be holes, for example, circular in cross section, provided at predetermined intervals around the circumferential direction of the valve seat 45, or may be slits provided continuously in an annular shape around the circumferential direction of the valve seat 45. By providing the second openings 44 with a plurality of holes, the holes can function as nozzles to increase the force of the injection of the cooling gas. Furthermore, by providing the second openings 44 with circumferential slits, the guide ring 7 (or the downstream valve seat 45 when no guide ring 7 is provided) can be effectively cooled around the entire circumference. The slits can be provided continuously around the entire circumference, or may be arranged intermittently around the circumference.

[0039] In addition, in this embodiment, the valve device 1 is equipped with a third cooling gas supply section 80 that sprays cooling gas supplied from outside the valve box 2 and the bonnet 5, i.e., from outside the housing H, into the fluid supply path 10 through a third ejection passage 82 (hereinafter referred to as the third opening 82 in the embodiment).

[0040] In the embodiment, a usage scenario is assumed in which, in a closed valve state, the flow path 12, which is the fluid supply path 10 downstream of the valve element 20, is at a higher temperature and pressure than the flow path 11, which is the fluid supply path 10 upstream. This usage scenario corresponds, for example, to a case in which the valve device 1 is a burner shutoff valve or the like provided in the fluid supply path 10 connecting a hot stove that supplies hot air to a blast furnace and a burner, which is its heat source. That is, in a closed valve state, the fluid supply path 10 on the downstream side (one side) shown on the right side of the figure is at a higher pressure and a higher temperature than the fluid supply path 10 on the upstream side (the opposite side) shown on the left side of the figure. For this reason, the third opening 82 of the third cooling gas supply unit 80 is configured to eject cooling gas toward the fluid supply path 10 on the downstream side (one side), which is the higher temperature side. In this embodiment, the third cooling gas supply unit 80 introduces the cooling gas supplied from the gas supply source 50 through the connecting passage 52 into an introduction passage 81 provided on the bonnet 5 side of the fluid supply path 10, and the introduced gas is sprayed into the fluid supply path 10 through the third opening 82, as shown in Figure 4.

[0041] As a result, the cooling gas forms an air layer, i.e., an air curtain, that separates the space in the high-temperature side fluid supply path 10 from the valve element 20. The formation of such an air layer improves the cooling performance of the valve element 20 in the closed valve state (including reducing the thermal influence from the thermal fluid), and prevents a rise in temperature on the surface of the valve element 20. Note that the communicating passage 52 may be provided with a flow rate adjustment valve similar to the first cooling gas supply part 60, so that the cooling gas is ejected only in the closed valve state, for example.

[0042] The third opening 82 penetrates the wall of the hollow member that constitutes the introduction passage 81 and also penetrates the refractory material 14 that is the inner wall of the fluid supply passage 10. The angle of the penetration direction of the third opening 82, i.e., the ejection direction of the cooling gas, may be changed as long as an air layer can be formed along the surface of the valve element 20 that faces the fluid supply passage 10 in the closed state. The ejection direction is preferably parallel to the opening / closing direction of the valve element 20 (the direction in which the valve stem 6 moves back and forth), but may be inclined relative to that direction.

[0043] In these embodiments, the first opening 62 and the third opening 82 are each a hole with a circular cross section, and the first opening 62 and the third opening 82 are configured to be arranged in parallel at a predetermined interval along the width direction of the fluid supply path 10. However, in other embodiments, for example, the first opening 62 and the third opening 82 may be elongated holes formed along the width direction of the fluid supply path 10.

[0044] In the above embodiment, the first cooling gas supply unit 60, the second cooling gas supply unit 40, and the third cooling gas supply unit 80 are configured to receive cooling gas from a common gas supply source 50, but they may also be supplied with cooling gas from separate gas supply sources.

[0045] Furthermore, in the above embodiment, it is assumed that in the closed valve state, the flow path 12, which is the fluid supply path 10 downstream of the valve element 20, is at a higher temperature and pressure than the flow path 11, which is the fluid supply path 10 upstream, but the present invention is not limited to such an application, and the valve device 1 of the present invention can be applied to various fluid supply paths 10 that handle high-temperature thermal fluids. For example, in addition to the burner shutoff valve described above, the valve device 1 of the present invention can also be applied to a hot blast valve provided in the fluid supply path 10 connecting a hot blast stove and a blast furnace. [Explanation of symbols]

[0046] 1 Valve gear 2 Valve box 5. Bonnet 10 Fluid supply path 20 Valve body 60 First cooling gas supply section 61 Entry Passage 62 First jet passage (first opening) 40 Second cooling gas supply section 43 Annular passage in valve box 44 Second ejection passage (second opening) 45 Valve seat 70 Guide 80 Third cooling gas supply section 81 Gas supply passage 82 Third Jet Passage (Third Opening)

Claims

1. a valve body (2) provided in a fluid supply path (10); a valve element (20) that opens and closes the fluid supply path (10) by moving back and forth within the valve box (2); a refrigerant passage (32) provided in the valve body (20) through which a refrigerant supplied from outside the valve box (2) flows; a bonnet (5) that houses the valve body (20) in an open state; a valve seat (45) provided in the valve box (2) and against which a peripheral portion of the valve body (20) in a closed state abuts; a space (A) between an end (20a) of the valve element (20) on the fluid supply path (10) side in an open state and the valve seat (45), the space (A) suppressing heat transfer from the fluid supply path (10) side to the valve element (20) in an open state; Equipped with The valve device includes a first cooling gas supply section (60) that ejects cooling gas supplied from outside the valve box (2) into the space (A) through a first ejection passage (62) that is provided on the bonnet (5) side of the valve seat (45).

2. 2. The valve device according to claim 1, wherein the cooling gas ejected from the first ejection passage (62) is ejected in a direction perpendicular to the direction of the advancement and retreat of the valve body (20).

3. 3. The valve device according to claim 1, further comprising a guide (70) on the bonnet (5) side of the space (A) for restricting movement of the valve body (20) in a direction perpendicular to the direction of advance and retreat.

4. 4. A valve device as described in any one of claims 1 to 3, further comprising an annular passage (43) inside the valve box arranged circumferentially along the valve seat (45), and a second cooling gas supply section (40) that supplies cooling gas supplied from outside the valve box (2) into the valve box (2) through a second jet passage (44) drawn out from the annular passage (43) inside the valve box.

5. the fluid supply passage (10) on either side of the valve body (20) in the axial direction has a higher temperature than the fluid supply passage (10) on the opposite side, and the first jet passage (62) is arranged on the opposite side of the valve body (20), 5. A valve device as described in any one of claims 1 to 4, further comprising a third cooling gas supply section (80) that sprays cooling gas supplied from outside the valve box (2) into the fluid supply path (10) on one side of the valve body (20).

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