JP2023035008A - valve device - Google Patents

Abstract

To further lower the temperature 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, a refrigerant passage 32 that is provided in the valve body 20 and in which a refrigerant circulates, refractories 21 and 22 that are respectively provided on a first surface side that is either one surface of the valve body 20 and on a second surface side that is the opposite side surface to the first surface in a flowing direction of the fluid supply path 10, a hood 5 that stores the valve body 20 in an opening-valve state, and a cooling gas supply portion 40 that supplies cooling gas into the valve box 2 through an opening 44 drawn out from a valve body inner annular passage 43 provided in a circumferential direction along the valve seat 45. The fluid supply path 10 on the second surface side of the valve body 20 in a closing-valve state has higher temperature than the fluid supply path 10 on the first surface side, and the refractory 22 on the second surface side is set to be thicker than the refractory 21 on the first surface side.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a valve device provided in a high-temperature fluid supply passage.

2. Description of the Related Art For example, Patent Document 1 discloses a valve device provided in a high-temperature fluid supply path. This valve device is a sluice valve having a cooling structure, and a valve body for opening and closing a flow path moves up and down inside a housing consisting of a valve box and a bonnet (referred to as a cap portion in Patent Document 1) provided on top of the valve body. freely installed. The bonnet serves as an accommodation space for the valve body in the valve open position.

The valve element is formed by connecting two disk-shaped valve plates made of steel plate by a pair of spiral plates that form a cooling water flow path from the center to the outer peripheral edge thereof. An annular seat ring is attached by welding to the outer peripheral edges of the connected valve plates.

The peripheral wall of the seat ring is provided with a water supply port and a water discharge port for supplying cooling water to the cooling water flow path, and a pair of hollow valve stems are connected in parallel to the water supply port and the water discharge port. An inlet and an outlet for cooling water are provided on the upper portion of the valve stem. Cooling water is supplied from the inlet, passes through the inside of the valve stem, enters the spiral cooling water flow path inside the seat ring from the water supply port, passes through the center of the valve body, and passes through the inside of the valve stem from the drain port. and discharged from the exit. As a result, the entire valve body is uniformly cooled.

JP-A-2003-262286

According to the valve device described in Patent Literature 1, it is possible to cool the members that constitute the valve body by the refrigerant (cooling water) passing through the inside of the valve body. However, there is a demand to further lower the temperature of the valve plate depending on the type of fluid handled in the hot air duct and the specifications of the facility.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to further reduce the temperature of a valve body in a valve device provided in a high-temperature fluid supply passage.

In order to solve the above-described problems, the present invention provides a valve body provided in a fluid supply path, a valve body that opens and closes the fluid supply path by advancing and retracting in the valve body, and a valve body provided in the valve body. A refrigerant passage through which refrigerant supplied from outside the valve body flows, a first surface side of the valve element along the flow direction of the fluid supply passage, and an opposite side of the first surface. The refractories provided on the side of the second surface, which is the side surface, respectively, the bonnet that accommodates the valve body in the open state, and the peripheral edge of the valve body that is provided in the valve body and in the closed state are in contact with each other. a valve seat, an annular passage in the valve box provided in the circumferential direction along the valve seat, and a cooling gas supplied from outside the valve box through an opening drawn out from the annular passage in the valve box. and a cooling gas supply unit for supplying cooling gas to the inside of the valve body, wherein the temperature of the fluid supply path on the side of the second surface of the valve body is higher than that of the fluid supply path on the side of the first surface in the valve closed state. , the refractory on the side of the second surface is thicker than the refractory on the side of the first surface.

Further, in order to solve the above-described problems, the present invention provides a valve body provided in a fluid supply path, a valve element for opening and closing the fluid supply path by advancing and retracting in the valve body, and a valve body provided in the valve body. a refrigerant passage through which refrigerant supplied from outside the valve box flows; a first surface side of the valve element along the flow direction of the fluid supply passage; A refractory provided on the side of the second surface opposite to the second surface, a bonnet that accommodates the valve body in the open state, and a peripheral edge of the valve body that is provided in the valve body and in the closed state a valve seat in contact, an annular passage in the valve box provided in the circumferential direction along the valve seat, and a cooling gas supplied from outside the valve box through an opening drawn out from the annular passage in the valve box. a cooling gas supply unit for supplying cooling gas into a valve box, wherein the refrigerant passage extends from a supply port provided at the end of the valve body on the bonnet side through the center of the valve body and through the valve body. a first flow path extending to the bottom side end of the valve body; and outlets branched from the bottom side end to both sides across the first flow path and provided at the bonnet side end of the valve body. and a second flow path portion leading to the valve device.

Here, the refrigerant passage is configured by a partition wall provided in the valve body, and an end portion of the partition wall is interposed at a bending point of the flow path of the refrigerant passage. is preferably formed in a smooth arc shape along the flow direction of the flow path on both sides of the bend point.

INDUSTRIAL APPLICABILITY The present invention can further reduce the temperature of the valve body in the valve device provided in the high-temperature fluid supply passage.

1 is an enlarged vertical cross-sectional view of a main portion showing a first embodiment of the present invention; Front view of the same embodiment Sectional view of the valve body of FIG. FIG. 2 is an enlarged vertical cross-sectional view of a main portion showing a second embodiment of the present invention; Cross-sectional view of the valve body of FIG. Enlarged view of main part of Fig. 5 Enlarged view of main part of Fig. 5 Enlarged view of main part of Fig. 5 Enlarged view of main part of Fig. 5

A first embodiment of the invention will be described with reference to FIGS. 1 to 3. FIG. In this embodiment, the configuration of the present invention will be described by taking as an example a valve device 1 provided in a hot fluid supply pipeline 10 (hereinafter referred to as a fluid supply path 10) leading to a blast furnace.

As shown in FIG. 1, the valve device 1 is of a gate valve type in which a valve box 2 is provided in the middle of a fluid supply path 10 and a valve body 20 is provided in the valve box 2 so as to be freely movable back and forth. The fluid supply path 10 is opened and closed as the valve body 20 advances and retreats 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 body valve seat 45 is provided on the upstream side of the valve body 20 in the valve body 2 . The valve body valve seat portion 34 and the valve body valve seat 45 (hereinafter simply referred to as the valve seat 45) are provided in an annular shape, respectively, and are in contact with each other over the entire circumference when the valve is closed. An annular guide ring 7 is provided on the downstream side of the valve body 20 inside the valve body 2 . The guide ring 7 faces the valve body valve seat portion 34 of the valve body 20 in the valve closed state. Hereinafter, the direction parallel to the axial center of the fluid supply path 10 forming a linear shape is referred to as the axial direction, and the direction orthogonal to the axial center is referred to as the radial direction.

The peripheral portion of the valve body 20 is pressed against the valve seat 45 by receiving force from the downstream side where the pressure is relatively high when the valve is closed. Therefore, in the embodiment, a one-sided valve seat in which the valve seat 45 is provided only on the upstream side is adopted. Depending on the application of the valve device 1, the valve seats 45 may be provided on both the upstream side and the downstream side. In this case, the guide ring 7 on the downstream side can be omitted.

The inner surface of the fluid supply path 10 in the valve body 2, except for the space into which the valve body 20 enters, is covered with refractories 13 and 14 made of a material that can withstand high heat and has heat retention performance. A refractory 13 is arranged on the inner surface of the flow path 11 on the upstream side of the valve body 20 , and a refractory 14 on the inner surface of the flow path 12 on the downstream side. Between the upstream channel 11 and the downstream channel 12, a recess 8 into which the valve body 20 enters is provided. The inner surface of the recess 8 is also covered with a similar refractory 15 . Reference numeral 9 shown in FIGS. 1 to 3 denotes a drain, and reference numeral 9a shown in FIG. 2 denotes a drain valve. As these refractories, for example, refractory bricks and the like are adopted.

The valve box 2 has a hollow mounting portion 3 on its upper portion that protrudes outward from the outer surface of the cylindrical body forming the fluid supply passage 10 . Further, a lid member 4 is attached to the upper portion of the attachment portion 3 via flanges 3a and 4a. A housing H is composed of the valve box 2 (including the mounting portion 3 ) and the lid member 4 . Moreover, the insides of the mounting portion 3 and the lid member 4 function as a bonnet 5 that accommodates the valve body 20 in the open state. The inner surfaces of the mounting portion 3 and the lid member 4 are also covered with the same refractory 16 as the inside of the fluid supply path 10 . The valve box 2 and the lid member 4 are collectively referred to as a housing H hereinafter.

A valve stem 6 is attached to the valve body 20 . The valve stem 6 extends upward inside the bonnet 5 and is pulled out of the housing H. As shown in FIG. The valve stem 6 is driven by a driving device to move forward and backward in the axial direction of the valve stem 6, and the valve body 20 moves forward and backward together with the valve stem 6 in the same direction. That is, the valve body 20 closes the valve when the valve stem 6 moves (downwards) along the axial direction of the valve stem 6 to one side, and moves to the other side along the axial direction of the valve stem 6 ( rise) to open the valve.

In addition, the valve device 1 supplies cooling gas supplied from a gas supply source provided outside the valve body 2 and the bonnet 5, that is, outside the housing H, through an opening 44, which is a cooling gap provided in the valve seat 45. A cooling gas supply unit 40 for supplying the inside of the valve box 2 is provided. The valve seat 45 is made of a hollow annular member, the inside of which serves as a passage 43 for the cooling gas, and the opening 44 is led out from the passage 43 . By providing the cooling gas supply unit 40 in this manner, the metal surface of the valve seat 45 can be efficiently cooled.

A refrigerant passage 32 through which refrigerant supplied from outside the housing H flows is provided in the valve body 20 . As shown in FIG. 1, the valve body 20 includes two metal (steel) valve plates 24 and 25 sandwiching a coolant passage 32 arranged in the center in the thickness direction. The outer side of the valve plate 24 on the upstream side is covered with a refractory material 21 and the outer side of the valve plate 25 on the downstream side is covered with a refractory material 22 . An annular seat ring 27 is attached to the outer peripheral edge of the valve body 20 , and the end surface of the seat ring 27 constitutes a valve body valve seat portion 34 . As shown in FIG. 1, a pair of spiral plates ( partition walls) 51 and 52 are arranged. The spiral plates 51 and 52 form the coolant passage 32 .

A pair of refrigerant passages 37 and 38 provided in the valve stem 6 are connected to a supply port R and a discharge port K provided at the top of the valve body 20, that is, at the end on the bonnet 5 side. A pair of coolant passages 37 and 38 communicate with a coolant supply source (not shown). Refrigerant supplied from a refrigerant supply source flows into the starting end T of the outer peripheral passage U from the supply port R through the refrigerant passage 37 inside one valve rod 6 . The outer passage U is an annular space 33 formed by a seat ring 27 having a U-shaped cross section and an annular member 35 located on the inner diameter side thereof. Refrigerant advances from the starting end T along the peripheral edge of the valve body 20 through the outer peripheral passage U and reaches the inlet V of the inflow-side spiral passage W. As shown in FIG. Further, the refrigerant gradually advances from the inlet V through the inflow side spiral passage W toward the inner diameter side, reaches the central portion X of the valve body 20, and then advances from the central portion X to the outflow side spiral passage Y. As shown in FIG.

At the central portion X, the inflow spiral passage W and the outflow spiral passage Y are bent at an angle of about 180°. 52b intervenes. The end portions 51a and 52b are formed in a smooth arc along the flow direction of the flow path on both sides of the bending point.

The refrigerant advances from the central portion X through the outflow-side spiral passage Y and reaches the exit Z of the outflow-side spiral passage Y while gradually moving radially outward. Then, the refrigerant advances from the exit Z of the outflow side spiral passage Y to the discharge port K, and returns to the refrigerant supply source through the refrigerant passage 38 inside the other valve stem 6 . The coolant supply section 30 for cooling the valve element 20 is configured as described above. In this embodiment, air is used as the coolant handled by the coolant supply unit 30, but it may be a coolant composed of a gas other than air, or a coolant composed of a liquid.

Further, as described above, the valve body 20 has the refractory 21 on the outside of the valve plate 24 on the upstream side and the refractory 22 on the outside of the valve plate 25 on the downstream side. In this embodiment, the surface facing the upstream side of the valve body 20 along the flow direction of the fluid supply path 10 is called the first surface, and the surface facing the downstream side (the surface opposite to the first surface) is called the second surface. . In the embodiment, in the closed state, the flow path 12, which is the fluid supply path 10 on the second surface side (downstream side) of the valve body 20, is the fluid supply path 10 on the first surface side (upstream side). Assuming a usage pattern in which the temperature is higher than that of the flow path 11, the thickness t2 of the member of the refractory 22 on the side of the second surface, which is the high temperature side, is set to the thickness t2 of the refractory 21 on the side of the first surface, which is the low temperature side. is set to be thicker than the thickness t1 of the member. In particular, when the valve device 1 is a burner cutoff valve or the like provided in the fluid supply path 10 connecting the hot blast furnace that supplies hot air to the blast furnace and the burner that is the heat source, as in this embodiment, The downstream side can be hotter than the upstream side when the valve is closed.

Regarding this point, in the conventional valve device, the cross section of the valve body is symmetrical about the valve stem along the flow direction of the fluid supply passage. However, in the present invention, the cross section of the valve body 20 is made asymmetrical along the flow direction of the fluid supply passage 10, so that the heat load received from the upstream side and the downstream side can be obtained without changing the overall thickness of the valve body 20. A heat-resistant structure that takes into account the difference in That is, the refractory 22 on the side of the second surface, which is the high temperature side of the valve body 20, is set thicker than the refractory 21 on the side of the first surface, which is the relatively low temperature side. This makes it possible to more effectively reduce the heat transfer to the valve body 20 from the side having a high heat load in the valve closed state, particularly in the fully closed state.

When the valve device 1 is a burner cutoff valve or the like, the temperature of the downstream side may be higher than that of the upstream side when the valve is closed as in this embodiment. It is also conceivable that the difference in heat load is reversed. That is, when the side where the heat load (heat demand) on the valve body 20 is large in the closed state is the upstream side and the side where the heat load (heat demand) is small is the downstream side, the upstream side is the high temperature side of the second surface, and the downstream side is the low temperature side. It corresponds to the side of the first surface. Therefore, the refractory 21 on the upstream side, which is the side of the second surface, is set thicker than the refractory 22 on the downstream side, which is the side of the first surface.

A second embodiment of the invention is shown in FIGS. 4-6D. As shown in FIG. 4, the basic configuration of the valve device 1 is the same as that of the above-described embodiment, and therefore the refrigerant passage 32 and the like, which are the points of difference, will be mainly described below.

As shown in FIG. 5, the refrigerant passage 32 of this embodiment extends from the supply port R provided at the top of the valve body 20, that is, at the end on the bonnet 5 side, through the center of the valve body 20, and the valve It has a first channel portion S that reaches the bottom side end A of the body 20 . In addition, the refrigerant passage 32 branches from the bottom side end A into two routes on both sides of the first flow passage portion S, and each route reaches the discharge port K provided at the top of the valve body 20. It is a second flow path portion.

The first channel portion S is a linear channel formed by front and back valve plates 24 and 25 and a pair of vertical partition walls 36 and 36 . Refrigerant supplied from the refrigerant supply source flows through the refrigerant passage 37 inside one valve stem 6 from the supply port R into the first flow passage portion S, and reaches the bottom side end portion A that serves as a connection point to the second flow passage portion. up to. The second flow path portion is composed of an outer peripheral passage B, a first arcuate passage D, a second arcuate passage F, a third arcuate passage H, and an outlet guide passage J in order along the flow direction of the refrigerant.

The outer passage B is an annular space 33 formed by a seat ring 27 having a U-shaped cross section and an annular member 35 located on the inner diameter side thereof, and extends from the bottom side end A to both sides in the width direction of the valve body 20 . ing. Further, the side surface of the seat ring 27 covering the outer peripheral passage B serves as a valve body valve seat. Refrigerant flows from the bottom side end A along the peripheral edge of the valve body 20 through the outer peripheral passage B and reaches the inlet C of the first arcuate passage D on the top side of the valve body 20 . Refrigerant advances from the inlet C through the first arcuate passage D toward the bottom, and reaches the inlet E of the second arcuate passage F located on the inner diameter side of the first arcuate passage D at the bottom of the valve body 20 . Further, the refrigerant advances from the inlet E through the second arcuate passage F toward the top side, and reaches the inlet G of the third arcuate passage H located on the inner diameter side of the second arcuate passage F at the top of the valve body 20 . Further, the refrigerant proceeds from the inlet G toward the bottom side through the third arcuate passage H and reaches the inlet I of the outlet guide passage J at a position near the center of the valve body 20 . The outlet guide path J is a linear flow path provided on both sides of the first flow path portion S. Refrigerant flows from the inlet I through the outlet guide passage J to the outlet K, and then through the refrigerant passages 38; 38a, 38b inside the other valve stem 6 and returns to the refrigerant supply source. As described above, the coolant supply section 30 is configured to cool the valve body 20 in order from the inlet R to the center of the valve body, the lower part of the valve body, and the valve seat surface (periphery of the valve body). The refrigerant handled by the refrigerant supply unit 30 is the same as in the above-described embodiment.

The first arcuate passage D, the second arcuate passage F, the third arcuate passage H, and the outlet guide passage J are composed of front and back valve plates 24, 25, arcuate partition walls 31, 32, 35, and a pair of vertical partition walls. 36, 36 and outer vertical partition walls 37, 37 arranged along the vertical partition walls 36, 36 and the like. Portions of the outer vertical partition walls 37 , 37 near the bottom are arc-shaped along the arc-shaped partition wall 31 .

The conventional valve device disclosed in Patent Document 1 and the like described above is of a water-cooled type, and gives priority to cooling the peripheral portion of the valve body and, in particular, to cooling the bottom portion of the valve body when the valve body is fully opened. This is because when the refrigerant is water, the temperature of the refrigerant (water temperature) rises relatively little even with a structure that cools the central portion of the valve after cooling the valve seat surface (peripheral portion of the valve). because there was However, if the refrigerant is a gas such as air, the temperature of the refrigerant will rise in such a structure, and the cooling performance for the central portion of the valve body may not be sufficient. Moreover, even with the same water-cooled type, if there is a demand for more effective cooling of the central portion of the valve body, the above structure has limitations in improving the cooling performance.

Therefore, according to the present invention, in order to supply the refrigerant to a place to be preferentially cooled first, the central portion of the valve body 20, the bottom portion of the valve body 20, and the peripheral portion of the valve body 20 are arranged in this order as in the above configuration. A flow path of the coolant passage 32 is configured. That is, by providing the first flow path portion S, the structure is such that cooling of the central portion of the valve body 20 is prioritized over the valve seat surface of the valve body 20 (peripheral portion of the valve body).

Further, the second flow path section that follows the first flow path section S is configured to be divided into two routes from the bottom side end A of the first flow path section S. As shown in FIG. That is, in the refrigerant passage 32, the first flow passage portion S and the second flow passage portion (peripheral passage B) are connected at the bottom portion of the valve body 20 in a three-forked form. As a result, the second flow path portion cools the peripheral edge portion of the valve body 20, which has a high priority for cooling, in the two routes of the outer peripheral passage B, and then the refrigerant gradually advances to the inner diameter side of the valve body 20. It will be. In other words, by adopting a cooling system in which the valve body 20 is divided into two parts in the width direction, the cooling performance for the peripheral portion of the valve body 20 can be enhanced.

In this embodiment, as shown in FIG. 5, the refrigerant passage 32 includes partition walls 31, 32, 35, 36, and 37 (hereinafter, all names are unified to partition walls) provided in the valve body 20. ), and end portions 31b, 32a, 35a, 36a, and 37a of partition walls 31, 32, 35, 36, and 37 are interposed at bending points of the flow path. That is, at points where the flow path bends, the ends 31b, 32a, 35a, 36a, and 37a of the partition walls 31, 32, 35, 36, and 37 are located inside the curves of the bend points.

In this embodiment, the outer shapes of the ends 31b, 32a, 35a, 36a, and 37a intervening at the bend point of the flow path are formed in smooth arcs along the flow direction of the flow paths on both sides of the bend point. It is In general, when the cross-sectional area of the flow path is not constant, the flow velocity of the fluid locally changes. By streamlining the tip of the wall surface at the position where the flow velocity becomes high or the position where the fluid separates from the wall surface, vibration, noise, and cavitation in the case of water cooling can be reduced. In this embodiment, cavitation can be reduced by forming the end of the wall surface of the coolant passage 32 into a smooth arc shape along the flow direction at the position where the wall surface of the flow channel of the coolant passage 32 is interrupted. Here, a smooth arc means a rounded shape that does not impede the flow of fluid without steps or discontinuities, such as an arc shape, a tapered shape, or a streamline shape.

Examples of such shapes are shown in FIGS. 6A to 6D. Arrows in each figure indicate the flow direction of the coolant. In FIG. 6A, at the connecting portion between the end portion 35a of the partition wall 35 and the end portion 36a of the partition wall 36, the outer shape of the ridgeline portion of the connecting portion is a smooth arc. In the drawing, the contour of the ridgeline is arc-shaped (R-shaped), but it may be a smooth C-cut. In FIG. 6B, the shape of the end 32a of the partition wall 32 is a smooth arc. The arcuate portion 32c on the upstream side facing the flow path with a large degree of curvature is set to have a smaller curvature (larger curve radius) than the arcuate portion 32d on the downstream side. In FIG. 6C, the shape of the end portion 31a of the partition wall 31 is a smooth arc. The arcuate portion 31d on the downstream side facing the channel with a large degree of curvature is set to have a smaller curvature (larger curve radius) than the arcuate portion 31c on the upstream side. In FIG. 6D, the shape of the end 37a of the partition wall 37 is a smooth arc. The arcuate portion 37c on the upstream side facing the flow path with a large degree of curvature is set to have a smaller curvature (larger curve radius) than the arcuate portion 32d on the downstream side. In addition, in the first embodiment, the end portions 51a and 52b of the partition walls 51 and 52 are formed in a smooth arc shape, which is expected to have the same effect as described above.

In addition, for the valve body 20 having the refrigerant passage 32 in the second embodiment, the structure of the refractories 21 and 22 in the first embodiment, that is, the structure of the refractory 22 on the high temperature side in the closed state A configuration in which the thickness is thicker than the thickness of the refractory 21 on the low temperature side can also be applied.

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 cutoff valve described above, the valve device 1 of the present invention can also be applied to a hot air valve provided in a fluid supply passage 10 connecting a hot air furnace and a blast furnace.

1 Valve Device 2 Valve Box 5 Bonnet 10 Fluid Supply Path 20 Valve Elements 21, 22 Refractory Material 32 Refrigerant Passage 43 Circular Passage in Valve Box 44 Opening 45 Valve Seat A Bottom Side End K Discharge Port R Supply Port S First Channel Department

Claims (3)

a valve box (2) provided in the fluid supply path (10);
a valve body (20) for opening and closing the fluid supply path (10) by advancing and retreating in the valve box (2);
a refrigerant passage (32) provided in the valve body (20) through which refrigerant supplied from outside the valve box (2) flows;
A first surface side, which is one of the surfaces of the valve body (20) along the flow direction of the fluid supply channel (10), and a second surface side, which is a surface opposite to the first surface. Refractories (21, 22) respectively provided in
a bonnet (5) that accommodates the valve body (20) in an open state;
a valve seat (45) which is provided in the valve body (2) and abuts against a peripheral edge of the valve body (20) in a closed state;
a valve body annular passage (43) provided in the circumferential direction along the valve seat (45);
A cooling gas supply section (40) for supplying cooling gas supplied from outside the valve box (2) into the valve box (2) through an opening (44) led out from the inner valve box annular passage (43). )and,
with
In the valve closed state, the fluid supply passage (10) on the second surface side of the valve body (20) has a higher temperature than the fluid supply passage (10) on the first surface side. The refractory (22) on the side of the valve device is set thicker than the refractory (21) on the first surface side. a valve box (2) provided in the fluid supply path (10);
a valve body (20) for opening and closing the fluid supply path (10) by advancing and retreating in the valve box (2);
a refrigerant passage (32) provided in the valve body (20) through which refrigerant supplied from outside the valve box (2) flows;
A first surface side, which is one of the surfaces of the valve body (20) along the flow direction of the fluid supply channel (10), and a second surface side, which is a surface opposite to the first surface. Refractories (21, 22) respectively provided in
a bonnet (5) that accommodates the valve body (20) in an open state;
a valve seat (45) which is provided in the valve body (2) and abuts against a peripheral edge of the valve body (20) in a closed state;
a valve body annular passage (43) provided in the circumferential direction along the valve seat (45);
A cooling gas supply section (40) for supplying cooling gas supplied from outside the valve box (2) into the valve box (2) through an opening (44) led out from the inner valve box annular passage (43). )and,
with
The refrigerant passage (32) extends from a supply port (R) provided at the end of the valve body (20) on the bonnet (5) side through the center of the valve body (20). A first flow path portion (S) reaching the bottom side end portion (A) of (20), and the valve branched from the bottom side end portion (A) to both sides across the first flow path portion (S), respectively and a second flow path portion leading to a discharge port (K) provided at the end of the body (20) on the bonnet (5) side. The refrigerant passage (32) is constituted by partition walls (31, 32, 35, 36, 37, 51, 52) provided in the valve body (20). The ends (31b, 32a, 35a, 36a, 37a, 51a, 52a) of the partition walls (31, 32, 35, 36, 37, 51, 52) are interposed at the bending points of the flow path of 3. The end portion (31b, 32a, 35a, 36a, 37a, 51a, 52a) according to claim 1 or 2, wherein the end portions (31b, 32a, 35a, 36a, 37a, 51a, 52a) are formed in a smooth arc shape along the flow direction of the flow path before and after the bending point. valve device.

Images