Valve insulation structure and valve

Abstract

An object of the present invention is to provide a valve insulation structure and a valve that can provide insulation between the fluid passing through the flow path and the valve drive unit, and can prevent condensation from occurring on the valve drive unit due to the valve drive unit becoming cold. [Solution] The butterfly valve 12 is configured to include a valve box 14 having a protruding portion 18 protruding from a cylindrical portion 16, a seat ring 24 having a cylindrical portion 26 fitted into the cylindrical portion 16 of the valve box 14, a valve body 30 arranged within the cylindrical portion 26 of the seat ring 24, a neck member 40 connected to the protruding portion 18 of the valve box 14, a valve stem 32 whose penetrating tip is fixed to the valve body 30, and a roughly ring-shaped space portion 70 provided between the valve box 14 and the seat ring 24.

Description

[Technical field]

[0001] The present invention relates to a valve insulation structure constituting a valve such as a butterfly valve, and to the valve. [Background technology]

[0002] Conventionally, butterfly valves (valves) are used to close or open the flow of a fluid. FIG. 3 shows a butterfly valve 100 as an example. The butterfly valve 100 includes a valve body 104, a seat ring 110, a valve body 108, a neck member 112, and a valve stem 106. The valve body 104 includes a tubular portion 103 and a protruding portion 105 protruding from the tubular portion 103. The seat ring 110 includes a cylindrical portion 109, and is configured so that the cylindrical portion 109 is fitted into the cylindrical portion 103 of the valve body 104. The valve body 108 is disposed within the cylindrical portion 109 of the seat ring 110. The inner hollow portion of the cylindrical portion 109 constitutes the flow path 102. The neck member 112 has a flange (fixing portion) 118 to be fixed to a valve driving portion (not shown) having a rotation driving means, a control means, etc., and is configured to be connected to the protruding portion 105 of the valve box 104. The valve stem 106 rotatably passes through the neck member 112, the protruding portion 105 of the valve box 104, and the seat ring 110, and its penetrating tip (not shown) is fixed to the valve disc 108 and configured to rotate together with the valve disc 108 around the rotation center C0. The seat ring 110 has a seat portion 114 against which the valve disc 108 abuts. The lower portion of the tubular portion 116 of the neck member 112 is inserted into the protruding portion 105 of the valve box 104.

[0003] The butterfly valve 100 is used by fixing the flange 118 of the neck member 112 to the valve drive unit. When the fluid passing through the flow path 102 of the butterfly valve 100 is low temperature, the low temperature is transferred to the flange 118 via the valve body 108, the seat ring 110, the valve body 104, and the cylindrical part 116 of the neck member 112, and then to the valve drive unit to which the flange 118 is fixed (heat moves from the valve drive unit on the high temperature side to the fluid on the low temperature side). This may cause the valve drive unit to become cold, resulting in condensation on the valve drive unit. When condensation occurs on the valve drive unit, the dripping of the condensation causes stains on the ceiling or wall of the factory or the like on which the condensation has dripped. In addition, the dripping of the condensation may cause the equipment around the valve drive unit to not operate smoothly or may cause corrosion. There is a document on preventing condensation on the butterfly valve itself (see Patent Document 1). However, none of the documents are related to the present invention. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-2359 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a valve insulation structure and a valve that can provide insulation between a fluid passing through a flow path and a valve drive section, and can prevent condensation from occurring on the valve drive section due to the valve drive section becoming cold. [Means for solving the problem]

[0006] The valve insulation structure of the present invention is as follows: A valve body having a cylindrical portion and a connecting portion continuous with the cylindrical portion; a seat ring having a cylindrical portion, the cylindrical portion being fitted into the tubular portion of the valve body; a valve body disposed within the cylindrical portion of the seat ring; A neck member having a fixing portion fixed to a valve driving portion and a connecting portion directly or indirectly connected to a connecting portion of the valve body; A valve stem that is rotatably inserted through the neck member, the connection portion of the valve body, and the seat ring and has a penetrating end fixed to the valve body; The valve insulation structure of the valve is provided with The valve body; The seat ring; A substantially ring-shaped space portion provided between the valve body and the seat ring; The present invention is characterized in that it is composed of:

[0007] The valve insulation structure of the present invention is characterized in that, in the valve insulation structure, a substantially ring-shaped insulation member is provided in the space.

[0008] In addition, the valve insulation structure of the present invention is characterized in that, in the valve insulation structure, the insulation member is configured to be radially divided into a plurality of parts.

[0009] The valve insulation structure of the present invention is as follows: A valve body having a cylindrical portion and a connecting portion continuous with the cylindrical portion; a seat ring having a cylindrical portion, the cylindrical portion being fitted into the tubular portion of the valve body; a valve body disposed within the cylindrical portion of the seat ring; A neck member having a fixing portion fixed to a valve driving portion and a connecting portion directly or indirectly connected to a connecting portion of the valve body; A valve stem that is rotatably inserted through the neck member, the connection portion of the valve body, and the seat ring and has a penetrating end fixed to the valve body; The valve insulation structure of the valve is provided with The valve body; The neck member; An intervening member having thermal insulation properties interposed between the connection portion of the valve body and the neck member; The present invention is characterized in that it is composed of:

[0010] The valve of the present invention is A valve body having a cylindrical portion and a connecting portion continuous with the cylindrical portion; a seat ring having a cylindrical portion, the cylindrical portion being fitted into the tubular portion of the valve body; a valve body disposed within the cylindrical portion of the seat ring; A neck member having a fixing portion fixed to a valve driving portion and a connecting portion directly or indirectly connected to a connecting portion of the valve body; A valve stem that is rotatably inserted through the neck member, the connection portion of the valve body, and the seat ring and has a penetrating end fixed to the valve body; A substantially ring-shaped space portion provided between the valve body and the seat ring; The present invention is characterized by comprising:

[0011] The valve of the present invention is characterized in that the valve further includes a substantially ring-shaped heat insulating member disposed within the space.

[0012] The valve of the present invention is characterized in that the heat insulating member is divided into a plurality of parts radially.

[0013] The valve of the present invention further includes an auxiliary valve rod that is rotatably inserted through the seat ring from a direction opposite to the valve rod and has a tip end fixed to the valve body in the penetrating direction, The heat insulating member is characterized in that it rotatably holds the auxiliary valve rod.

[0014] The valve of the present invention is A valve body having a cylindrical portion and a connecting portion continuous with the cylindrical portion; a seat ring having a cylindrical portion, the cylindrical portion being fitted into the tubular portion of the valve body; a valve body disposed within the cylindrical portion of the seat ring; A neck member having a fixing portion fixed to a valve driving portion and a connecting portion directly or indirectly connected to a connecting portion of the valve body; A valve stem that is rotatably inserted through the neck member, the connection portion of the valve body, and the seat ring and has a penetrating end fixed to the valve body; An intervening member having thermal insulation properties interposed between the connection portion of the valve body and the neck member; The present invention is characterized by comprising: Effect of the Invention

[0015] According to the present invention as set forth in claims 1 and 5, a space in which air with low thermal conductivity exists is provided between the valve body and the seat ring, so that it is possible to prevent low temperatures from being transmitted from the seat ring to the valve body. This makes it possible to prevent low temperatures of the fluid in the flow path from being transmitted to the valve actuator via the seat ring, the valve body, and the neck member (it is possible to prevent heat from being transferred from the valve actuator on the high temperature side to the fluid on the low temperature side). This makes it possible to provide insulation between the low temperature fluid and the valve actuator, and it is possible to prevent the valve actuator from becoming cold and causing condensation on the valve actuator.

[0016] According to the valve insulation structure of the present invention as set forth in claims 4 and 9, since an interposing member having thermal insulation properties is provided between the connection part of the valve body and the neck member, the low temperature of the fluid is less likely to be transmitted from the connection part to the neck member. Therefore, the low temperature of the fluid is less likely to be transmitted to the valve actuator via the valve body and the neck member, and insulation between the low-temperature fluid and the valve actuator can be achieved, thereby preventing condensation from occurring on the valve actuator. [Brief description of the drawings]

[0017] [Figure 1] 1 is a front cross-sectional view showing a valve insulation structure and a valve according to the present invention. [Diagram 2] FIG. 2 is a perspective view showing a state in which the valve shown in FIG. 1 is assembled. [Diagram 3] FIG. 1 is a perspective view showing a conventional valve. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] An embodiment of a valve insulation structure and a butterfly valve (valve) according to the present invention will be described with reference to the drawings. In Fig. 1 and Fig. 2, reference numerals 10 and 11 denote the valve insulation structure according to the present invention, and reference numeral 12 denotes the valve according to the present invention. The valve insulation structures 10, 11 and the butterfly valve 12 will be described below with reference to Fig. 1 and Fig. 2.

[0019] (composition) (Valve box 14) The butterfly valve 12 includes a valve body 14 having a cylindrical portion 16 and a protruding portion (connecting portion) 18 that is continuous with the cylindrical portion 16 and protrudes from the cylindrical portion 16 and has a hollow portion 76. The valve body 14 is formed by connecting valve body components 14(1) and 14(2) with bolts 20 and nuts 22. The valve body 14 is formed from aluminum (pure aluminum or aluminum alloy). The valve body 14 may be formed from a metal other than aluminum.

[0020] (Seat ring 24 and flow passage 27) The butterfly valve 12 includes a seat ring 24 having a cylindrical portion 26, the cylindrical portion 26 being fitted into the tubular portion 16 of the valve box 14. The seat ring 24 is made of rubber or resin. The seat ring 24 is made of, for example, EPDM (ethylene propylene rubber) or NBR (nitrile rubber), and may be made of other rubber or resin. The seat ring 24 includes two bulging portions 25 that sandwich a heat insulating member 58 (described later) in the Y-axis direction (flow path direction). The seat ring 24 has a seat portion 28 with which a valve body 30 (described later) abuts. The seat portion 28 protrudes from an inner surface 26I of the cylindrical portion 26 and is a curved band-like shape. The cross-sectional shape of the seat portion 28 is not particularly limited. The inner hollow portion of the cylindrical portion 26 constitutes a flow path 27.

[0021] (Valve body 30) The butterfly valve 12 includes a valve element 30 disposed within the cylindrical portion 26 of the seat ring 24. The valve element 30 is generally disk-shaped or generally disc-shaped. The valve element 30 is made of stainless steel. The valve element 30 may be made of a metal other than stainless steel. The valve element 30 includes a fixing hole 34 into which a valve stem 32 (described later) is inserted and fixed, and a fixing hole 38 into which an auxiliary valve stem 36 (described later) is inserted and fixed.

[0022] (Neck member 40) The butterfly valve 12 includes a neck member 40 having a flange (fixing portion) 42 fixed to a valve driving portion 46 by a bolt (not shown) and a cylindrical connecting portion 44 indirectly connected to a protruding portion 18 of the valve box 14. The neck member 40 is made of aluminum, but may be made of a metal other than aluminum. The valve driving portion 46 has a rotation driving means and a control means for rotating the valve body 30 and a valve stem 32 described later. The valve driving portion 46 may be a known type such as a lever type, a gear type, a cylinder type, or an electric type. The connecting portion 44 is fixed to the protruding portion 18 of the valve box 14 by a bolt 78 via an intermediate member 48 described later. The flange 42 is provided with a space 43 in which air with low thermal conductivity is present. The space 43 can improve the heat insulating effect between the flange 42 and the valve driving portion 46.

[0023] (Stem 32) The butterfly valve 12 includes a valve stem 32 that is rotatably inserted through the neck member 40, the intermediate member 48 described below, the valve body 14, and the seat ring 24, and has a penetrating end 52 fixed to the valve body 30. The valve stem 32 is made of stainless steel, and may be made of stainless steel metal. The valve stem 32 has a penetrating rear end 54 fixed to a rotating shaft 56 that is rotated by a rotary drive means. The rotating shaft 56, the valve stem 32, and the valve body 30 are rotated together by the valve drive unit 46 around a rotation center C1 relative to the valve body 14, the seat ring 24, etc. The valve stem 32 has a hollow portion 55 in which air with low thermal conductivity is present. This is for thermal insulation between the valve stem 32 and the rotating shaft 56.

[0024] (Space 70 and heat insulating member 58) The butterfly valve 12 includes a substantially ring-shaped space 70 provided between the tubular portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24. The butterfly valve 12 includes a substantially ring-shaped heat insulating member 58 in the space 70 between the tubular portion 16 and the cylindrical portion 26. The heat insulating member 58 is formed from a resin having heat insulating properties, for example, from POM (polyacetal), but may be formed from a resin having heat insulating properties other than POM. The heat insulating member 58 is sandwiched between the tubular portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24, and is sandwiched between the two bulging portions 25 of the seat ring 24. The heat insulating member 58 is formed by combining heat insulating member components 58(1), 58(2), 58(3), and 58(4). The heat insulating member components 58(1), 58(2), 58(3), and 58(4) are arranged clockwise and combined to form a substantially ring shape. That is, the heat insulating member 58 is radially divided into four heat insulating member components 58(1), 58(2), 58(3), and 58(4). Each of the heat insulating member components 58(1), 58(2), 58(3), and 58(4) includes a contact plate 57 that contacts the cylindrical portion 26 of the seat ring 24, a plurality of arc-shaped bulging portions 59 that bulge from the contact plate 57 toward the valve box 14, and a plurality of fins 61 that are continuous with the contact plate 57 and the two opposing bulging portions 59. A plurality of spaces (where no member is present) are formed that are surrounded by two opposing bulging portions 59 among the plurality of bulging portions 59 and two opposing fins 61 among the plurality of fins 61. Air with low thermal conductivity can be present in each of these spaces.

[0025] The heat insulating member component 58(1) has a hole 62 into which the valve rod 32 is inserted. The heat insulating member component 58(1) is sandwiched between the tubular portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24, and the valve rod 32 is inserted into the hole 62 and sandwiched between the two bulging portions 25 of the seat ring 24, thereby restricting movement in the XYZ directions relative to the valve box 14, etc. The heat insulating member component 58(3) has a hole 64 into which the auxiliary valve rod 36 described below is inserted. In this specification, a penetrating part is called a "hole," and a non-penetrating part having a bottom surface is called a "hole." The hole 64 in the heat insulating member component 58(3) holds the auxiliary valve rod 36 rotatably. The insulation member component 58(3) is sandwiched between the tubular portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24, and the auxiliary valve rod 36 is inserted into the hole 64 and sandwiched between the two bulge portions 25 of the seat ring 24, thereby restricting movement in the X, Y and Z directions relative to the valve box 14, etc.

[0026] The heat insulating member components 58(2) and 58(4) are sandwiched between the heat insulating member components 58(1) and 58(3), respectively. The heat insulating member components 58(2) and 58(4) are sandwiched between the tubular portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24, and are sandwiched by the two bulging portions 25 of the seat ring 24. By being sandwiched between the heat insulating member components 58(1) and 58(3), movement in the XYZ directions relative to the valve box 14, etc. is restricted. For this reason, the heat insulating member components 58(1) can be attached to the cylindrical portion 26 of the seat ring 24, and the heat insulating member components 58(3) can be attached to and held in the cylindrical portion 26, so that the heat insulating member components 58(2) and 58(4) can be sandwiched between the heat insulating member components 58(1) and 58(3). In this state, by combining valve box components 14(1) and 14(2) so as to encase insulation member components 58(1), 58(2), 58(3), and 58(4), it becomes easy to attach the entire insulation member 58 to the seat ring 24, etc.

[0027] (Interposition member 48) The butterfly valve 12 includes an intervening member 48 interposed between the protruding portion 18 of the valve box 14 and the connecting portion 44 of the neck member 40. The intervening member 48 is formed of a resin having thermal insulation properties. The intervening member 48 is formed of, for example, POM (polyacetal), but may be formed of a resin having thermal insulation properties other than POM. The intervening member 48 includes a sandwiched portion 66 sandwiched between the protruding portion 18 and the connecting portion 44, and a tubular portion 68 into which the valve stem 32 is inserted and which is inserted into a hollow portion 76 of the protruding portion 18. The intervening member 48 is fixed by fixing the protruding portion 18 and the connecting portion 44 with a bolt 78, so that the sandwiched portion 66 is sandwiched and fixed between the protruding portion 18 and the connecting portion 44.

[0028] (Auxiliary valve stem 36) The butterfly valve 12 includes an auxiliary valve rod 36 that rotatably penetrates the seat ring 24 from the direction opposite to the valve rod 32 and has a penetrating direction tip 80 fixed to the valve body 30. The auxiliary valve rod 36 is made of stainless steel, but may be made of a metal other than stainless steel. The auxiliary valve rod 36 is inserted into a hole 64 of the heat insulating member component 58(3) and is rotatably held by the inner circumferential wall and bottom surface 74 of the hole 64.

[0029] (Valve insulation structure 10 and 11) The valve insulation structure 10 constitutes a butterfly valve 12, and is composed of a valve body 14, a seat ring 24, a space 70, and an insulation member 58. The valve insulation structure 11 constitutes a butterfly valve 12, and is composed of a valve body 14, a neck member 40, and an intermediate member 48.

[0030] (Action and Effects) The action and effect of the insulation between the fluid flowing through the flow passage 27 of the butterfly valve 12 of the present invention and the valve driver 46 will be described below. In the case of the butterfly valve 12, when a low-temperature fluid flows through the flow passage 27, the low temperature of the fluid flowing through the flow passage 27 is transferred to the cylindrical portion 26 of the seat ring 24, which has a large contact area with the fluid (heat moves from the cylindrical portion 26 on the high-temperature side to the fluid on the low-temperature side). As a result, the low temperature is transferred to the outer circumferential surface of the cylindrical portion 26.

[0031] Here, a space 70 exists between the tubular portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24. Since the thermal conductivity of the air in the space 70 is low, the low temperature of the outer circumferential surface of the cylindrical portion 26 is difficult to be transmitted to the cylindrical portion 16 through the space 70 (heat is difficult to be transferred from the cylindrical portion 16 on the high temperature side to the cylindrical portion 26 on the low temperature side). In addition, in the space 70, the lower temperature air moves downward along the gap between the outer circumferential surface of the cylindrical portion 26 and the heat insulating member 58, and the higher temperature air moves upward close to the protruding portion 18 at the upper part of the valve box 14. Therefore, the low temperature is difficult to be transmitted to the protruding portion 18 and the neck member 40 close to the protruding portion 18 (the intermediate member 48 exists between the protruding portion 18 and the neck member 40, but the action and effect of the intermediate member 48 will be described later). As a result, low temperature is less likely to be transmitted to the flange 42 of the neck member 40, and is less likely to be transmitted to the valve driver 46 in contact with the flange 42. Furthermore, the flange 42 is provided with a space 43 in which air with low thermal conductivity exists in order to improve the heat insulating effect between the flange 42 and the valve driver 46. Therefore, when the valve driver 46 is located above the butterfly valve 12, low temperature is not transmitted from the flange 42 to the valve driver 46 (heat does not move from the valve driver 46 on the high temperature side to the flange 42 on the low temperature side). According to the present invention, the above-mentioned action can provide heat insulation between the low temperature fluid and the valve driver 46, and it is possible to prevent the valve driver 46 from becoming cold and causing condensation on the valve driver 46.

[0032] Furthermore, according to the present invention, since insulation between the low-temperature fluid and the valve driver 46 can be achieved, it is not necessary to form the butterfly valve from stainless steel, which has low thermal conductivity, in order to achieve insulation between the low-temperature fluid and the valve driver 46. Therefore, the butterfly valve can be formed from aluminum or the like, which is different from stainless steel, which is expensive and heavy. This reduces the cost of the butterfly valve and makes it easier to manufacture.

[0033] Furthermore, since the heat insulating material 58 is provided in the space 70 between the tubular portion 16 of the valve box 14 and the cylindrical portion 26 of the seat ring 24, two layers, an air layer with low thermal conductivity and a heat insulating material layer with low thermal conductivity, exist in the space 70. This makes it more difficult for the low temperature of the outer peripheral surface of the cylindrical portion 26 to be transmitted to the valve driver 46 via the valve box 14. Also, due to heat loss caused by heat transfer between different objects, it makes it more difficult for the low temperature of the outer peripheral surface of the cylindrical portion 26 to be transmitted to the valve driver 46 via the valve box 14. This significantly produces the effect of the present invention, which is to insulate the low-temperature fluid in the flow path 27 from the valve driver 46.

[0034] According to the present invention, since the insulating interposition member 48 is provided between the protrusion 18 of the valve box 14 and the connection portion 44 of the neck member 40, the low temperature is less likely to be transmitted from the protrusion 18 to the connection portion 44. Also, due to heat loss caused by heat transfer between different objects, the low temperature is less likely to be transmitted from the protrusion 18 to the connection portion 44. Therefore, the low temperature in the flow path 27 is less likely to be transmitted to the valve actuator 46 via the valve box 14 and the neck member 40, and the effect of the present invention of insulating the low temperature fluid in the flow path 27 and the valve actuator 46 is more prominent. According to the present invention, due to the synergistic effect of the space 70, the insulating member 58, and the interposition member 48, the effect of the present invention of insulating the low temperature fluid in the flow path 27 and the valve actuator 46 is more prominent.

[0035] In addition, the valve stem 32 has a hollow portion 55 in which air with low thermal conductivity exists, and is long and has a small cross-sectional area, so that the low temperature of the fluid in the flow path 27 is hardly transmitted from the valve element 30 to the valve actuator 46 via the valve stem 32. In addition, the low temperature transmitted to the auxiliary valve stem 36 via the valve element 30 is blocked near the hole 64 of the heat insulating member component 58(3) and does not transmit to the valve body 14, and the low temperature transmitted from the valve element 30 to the auxiliary valve stem 36 does not transmit to the valve actuator 46 via the valve body 14, etc.

[0036] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be implemented by making appropriate modifications within the scope of producing the same action and effect. For example, the valve of the present invention is not limited to a butterfly valve, and the type of valve is not limited as long as it is a valve that uses a low-temperature fluid. Furthermore, the butterfly valve of the present invention includes single-axis eccentric, double-axis eccentric, and triple-axis eccentric. Furthermore, the heat insulating member constituting the present invention is not limited to being divided into four pieces, and may be formed as a single unit, or may be divided into two, three, five or more pieces. [Explanation of symbols]

[0037] 10, 11: Valve insulation structure 12: Butterfly valve (valve) 14: Valve box 14(1): 14(2): Valve body components 16: Cylindrical section 18:Protruding part (connecting part) 24: Seat ring 25:bulge 26: Cylindrical part 26I:Inner 27: Flow path 28: Seat section 30: Valve body 32: Valve stem 36: Auxiliary valve stem 40: Neck member 42: Flange (fixed part) 43: Space 44: Connection 46: Valve drive unit 48: Intervening member 55: Hollow part 56: Rotation axis 57: Contact plate 58: Insulation material 58(1), 58(2), 58(3), 58(4): Thermal insulation component parts 59:bulge 61: Finn 66: Clamped part 68: Cylindrical part 70: Space part 74: Bottom C1: Center of rotation

Claims

1. A valve body having a cylindrical portion; a seat ring having a cylindrical portion disposed within the tubular portion of the valve body; A valve insulation structure for a valve including: An outer diameter dimension of the cylindrical portion of the seat ring is made smaller than an inner diameter dimension of the tubular portion of the valve body, and an outer peripheral surface of the cylindrical portion of the seat ring and an inner peripheral surface of the tubular portion of the valve body are spaced apart from each other. The valve insulation structure is a substantially ring-shaped closed space portion formed between an outer peripheral surface of a cylindrical portion of the seat ring and an inner peripheral surface of a tubular portion of the valve body; A heat insulating member that is a member separate from the valve body and the seat ring is further provided in the space portion, A valve insulation structure, characterized in that the space is partitioned by the insulation member and divided into a plurality of spaces filled with air.

2. A valve insulation structure as described in claim 1, wherein the insulation member is configured to be pressed and clamped in the radial direction between the outer peripheral surface of the cylindrical portion of the seat ring and the inner peripheral surface of the tubular portion of the valve box.

3. The valve insulation structure according to claim 2 , wherein the heat insulating member is divided into a plurality of parts in a radial direction.

4. The valve body further has a connecting portion continuous with the cylindrical portion, and the valve further includes a neck member having a fixing portion fixed to a valve driving portion and a connecting portion directly or indirectly connected to the connecting portion of the valve body, and a valve rod that is rotatably inserted through the neck member, the connecting portion of the valve body, and the seat ring, and a penetrating tip is fixed to the valve body, The valve insulation structure is The valve insulation structure according to claim 2 or 3, further comprising an intervening member having thermal insulation properties interposed between the connecting portion of the valve body and the neck member.

5. The valve insulation structure according to any one of claims 1 to 4, The valve body; The seat ring; The valve body.

6. The valve insulation structure according to claim 4, The valve body; The seat ring; The valve body, The neck member; The valve comprises the valve stem.

7. An auxiliary valve rod is rotatably inserted through the seat ring from the opposite direction to the valve rod, and a tip end in the insertion direction is fixed to the valve body, The valve of claim 6 , wherein the insulating member is configured to rotatably hold the auxiliary valve stem.

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