JP2024009081A - Fixing device for face-to-face telescopic valve - Google Patents

Abstract

An object of the present invention is to provide a fixing device for a face-to-face telescopic valve that reliably centers a movable flange without complication and facilitates face-to-face telescopic work.
[Solution] A valve is provided with a movable flange 3 on a fixed flange 10 of a valve box 2 so as to be movable back and forth so as to expand and contract between surfaces, and this valve includes a fixing bolt that fixes the fixed flange 10 and the movable flange 3. 6, one end of the fixing bolt 6 can be inserted into a communication hole 25 formed in the movable flange 3, and the other end is screwed into a screw hole 21 formed in the fixed flange 10. A head bolt 9 was screwed and fixed to the end of the fixing flange 10 side.
[Selection diagram] Figure 8

Description

The present invention is particularly suitable for installation in the middle of existing piping, and relates to a fixing device for a face-to-face telescopic valve that can be adjusted by expanding and contracting the face-to-face in accordance with the distance between the pipes connected on both sides.

For example, when replacing a butterfly valve connected to an existing water pipe due to wear or damage, it is necessary to connect a new butterfly valve between the pipes on both sides with their faces aligned. In contrast, a surface that can be connected to existing piping, etc. by adjusting the distance between surfaces by expanding and contracting the flange surface with respect to the body of the valve itself, without requiring a separate part to adjust the distance between the surfaces. A telescopic butterfly valve is known.

As this type of face-to-face telescopic butterfly valve, one in which the face-to-face distance is adjusted by fastening a bolt (threaded rod) and a nut is generally used. In such a valve, a movable flange pipe is inserted into a socket formed in a cylindrical body so that it can move forward and backward, and the distance between the flange part formed in the body and the flange part on the flange pipe side is adjusted. , these flange portions are fixed to each other by one threaded rod and four nuts at each fastening location. In this case, while inserting the threaded rod into the bolt insertion holes formed in the flange on the body side and the flange on the flange pipe side, nuts are attached to both sides of each flange on the body side and the flange pipe side of the threaded rod. By screwing these four nuts together and adjusting the screwing positions of these four nuts, the flange pipe and the body can be adjusted to have a predetermined distance between them.

On the other hand, in the butterfly valve of Patent Document 1, a movable valve box is inserted in a receptacle of a cylindrical valve box in a state that it can move back and forth, and a plurality of stud bolts fixed to the movable valve box side and adjustment/fastening nuts are used. The distance between the flanges of the cylindrical valve box and the movable valve box is adjusted. When the movable valve box is inserted into the cylindrical valve box, the stud bolt is inserted into the bolt insertion hole in the flange of the cylindrical valve box, and the bolt is adjusted and tightened so that it is clamped from both sides of the flange. By screwing, two adjusting and tightening nuts are attached to one stud bolt.

On the other hand, in the butterfly valve of Patent Document 2, a short flange pipe is inserted into the valve box, and the distance between the flanges is adjustable by bolt members. The bolt member integrally includes a first threaded portion having a right-handed thread and a second threaded portion having a left-handed thread, and the first and second threaded portions are provided on the valve box side and the flange short pipe side. Opposite threaded holes are respectively provided for threading into the parts. In this valve, the flange short pipe is moved in the opposite direction with respect to the valve box by rotating the bolt member, and the distance between the flange surfaces is adjusted.

JP2002-340223A Japanese Patent Application Publication No. 2006-125417

In the face-to-face telescopic butterfly valve described in paragraph [0003] above, four nuts are screwed onto one threaded rod at each fastening point, and nuts are screwed onto both sides of each flange part of the body side flange part and the movable side flange pipe. Since the nuts are tightened, it is necessary to adjust each of the four nuts in order to expand and contract the movable flange pipe. In other words, when widening the distance between the two flanges, loosen the two nuts placed on the outside of each flange, and then move the two nuts placed on the inside in the direction that separates the flanges. On the other hand, when narrowing the distance between the two flanges, loosen the two nuts on the inside of each flange, and then move the two nuts on the outside so that the flanges approach each other. It will be tightened. In this way, it is necessary to adjust the loosening side nut and the tightening side nut for one threaded rod, making it difficult to match the specified spacing, and furthermore, the large number of nuts makes it difficult to adjust the loosening side nut and tightening side nut. becomes more complex and time-consuming.

On the other hand, in the butterfly valve of Patent Document 1, in order to expand and contract the movable valve box, two adjusting/fastening nuts attached to both sides of the fixed flange portion of the cylindrical valve box are adjusted with respect to one stud bolt. There is a need to. When extending or contracting the movable flange, first loosen the nut on the opposite side of the fixed flange portion to the extension/contraction operation side, and then tighten the nut on the extension/contraction operation side to extend/contract the movable flange. For this valve as well, it is necessary to adjust both sides of the movable flange side and the tightening nut at each fastening point, so it is difficult to adjust the distance between the specified faces like the above-mentioned face-to-face telescopic butterfly valve. .

Furthermore, in the butterfly valves mentioned above, the flange portion is tightened by screwing multiple nuts onto a single bolt, so if the nut to be loosened first is not loosened or is not loosened enough, When the nut on the tightening side is tightened, the flange on the movable side cannot be expanded or contracted to an appropriate position. In this case, it becomes difficult to adjust the distance between the flange surfaces to a predetermined dimension.

In these butterfly valves, the flange portion on the movable side is adjusted to extend or contract to a predetermined position, thereby maintaining the fixed state between the surfaces. As a result, when attempting to connect the flange section of external piping to the movable flange section after face-to-face adjustment, if the gap between the movable flange section and the external flange section becomes wider than necessary, it is possible to The tightness of the packing may be insufficient, and in this case, the sealing performance of the packing may not be sufficiently ensured, and water may leak from the joint of the flange.

In either case, the structure is such that the bolt is directly inserted into the bolt insertion hole in the flange part to expand and contract the body side and the movable side, so the inner peripheral surface of the insertion hole on the movable side is rubbed by the external thread of the bolt. The paint may peel off and rust may occur.

On the other hand, in Patent Document 2, the bolt member requires a right-hand thread and a left-hand thread, and each flange portion of the valve box side and the flange short pipe requires a threaded hole into which the right-hand thread and left-hand thread of the bolt member are screwed. Therefore, these processing operations require time and effort. Moreover, in addition to requiring precision during processing, the bolt member has right-handed and left-handed threads, and the telescopic structure uses threaded holes in each flange corresponding to the bolt member, making it less versatile. In particular, the bolt member cannot be used in existing face-to-face telescopic butterfly valves.

The present invention was developed in order to solve the above-mentioned problems, and its purpose is to reliably center a movable flange without complication and to facilitate surface-to-surface expansion and contraction work. An object of the present invention is to provide a fixing device for a telescopic valve.

In order to achieve the above object, the invention according to claim 1 is a valve that expands and contracts between surfaces by providing a movable side flange on a fixed flange of a valve box so as to be able to move forward and backward. A fixing bolt is provided for fixing the flange, and one end of the fixing bolt can be inserted into a communication hole formed in the movable flange, and the other end is screwed into a threaded hole formed in the fixed flange. This is a fixing device for a face-to-face telescopic valve in which a bolt with a head is screwed and fixed to the end on the fixed flange side.

The invention according to claim 2 is a fixing device for a face-to-face telescopic valve, in which the headed bolt is a hexagonal bolt.

The invention according to claim 3 is a fixing device for a face-to-face telescopic valve, in which the head of a hexagonal bolt is covered with a resin cap.

According to the invention according to claim 1, when expanding and contracting between the surfaces, the movable side flange can be moved forward and backward with respect to the valve box in a state centered around the flow path by the fixing bolt, and the distance between the surfaces can be reliably adjusted. In addition to making it possible to perform expansion and contraction operations, the head bolt allows the fixing bolt to be moved forward and backward easily, and the head prevents the fixing bolt from coming off from the fixing flange.

According to the invention according to claim 2, the fixing bolt can be reliably moved forward and backward by turning the head of the hexagonal bolt using a general tool or the like.

According to the invention according to claim 3, since the head of the hexagonal bolt is covered with a resin cap, there are useful effects such as the ability to rapidly rotate the fixing bolt with fingers.

FIG. 1 is a perspective view showing an embodiment of the face-to-face telescoping valve of the present invention. FIG. 2 is a partially cutaway front view of FIG. 1; 3 is an enlarged sectional view of section A in FIG. 2. FIG. FIG. 4 is an enlarged cross-sectional view showing the telescopic nut of FIG. 3 rotated clockwise. FIG. 4 is an enlarged cross-sectional view showing the telescopic nut of FIG. 3 rotated to the left. FIG. 3 is a front view showing a state in which external piping is connected to the face-to-face telescoping valve of FIG. 2; 7 is an enlarged view of part B in FIG. 6. FIG. 8 is a sectional view showing the vicinity of the fixing bolt in FIG. 7. FIG.

EMBODIMENT OF THE INVENTION Below, embodiment of the face-to-face telescopic valve in this invention is described in detail based on drawing. 1 and 2 show an embodiment of the face-to-face telescopic valve of the present invention, and FIG. 3 shows an enlarged sectional view of section A in FIG. 2.

The face-to-face telescopic valve (hereinafter referred to as the valve body 1) in the present invention is a telescopic butterfly valve, and in this example is provided with a nominal diameter of 300A. This nominal diameter size may be 250A or less or 350A or more. The valve body 1 includes a valve box 2, a movable flange 3, a long bolt 4, a telescopic nut 5, a fixing bolt 6, and a fixing nut 7. For example, the valve body 1 has a valve body 2, a movable flange 3, a long bolt 4, a telescopic nut 5, a fixing bolt 6, and a fixing nut 7. or as part of a new pipe, and is connected between the pipes by a flange connection.

The valve box 2 has a flow path 8 therein, a fixed flange 10 at one end, and a connecting flange 11 with the outside at the other end. The fixed flange 10 is formed in a substantially rectangular shape on the side where it is attached to the movable flange 3, and a seal member 12 made of a rubber material is attached to the inner periphery of the valve box on the fixed flange 10 side. A movable flange 3 is provided on the fixed flange 10 so as to be movable back and forth, so that the distance W between the connecting flange 11 and a movable flange portion 23 (described later) is extendable and retractable. The connection flange 11 is provided in a shape that can be connected to the flange portion 14 of the external piping 13 shown in FIG.

The fixing flange 10 is provided with an insertion hole 20 into which the telescopic nut 5 is inserted, and a threaded hole 21 into which the fixing bolt 6 is screwed. The insertion holes 20 are formed at two diagonal locations on the fixed flange 10 with an inner diameter slightly larger than the outer diameter near the center of the telescopic nut 5, and the screw holes 21 are formed at four locations on the fixed flange 10 at predetermined intervals. be done.

In the movable side flange 3, an insertion tube portion 22 is formed on the side to be attached to the valve box 2, and a movable flange portion 23 is integrally formed on the other end side of the insertion tube portion 22. The insertion cylinder part 22 is formed to have an outer diameter that can be inserted into the inner periphery of the valve box 2, and after insertion, the insertion cylinder part 22 can move forward and backward into the valve box 2 while being sealed by the sealing member 12 on the outer periphery side. The movable flange portion 23 is formed in a shape that can be connected to the flange portion 14 of the external pipe 13, and a female thread portion 24 is formed in the movable flange portion 23 at a position concentric with the insertion hole 20 of the fixed flange 10. Communication holes 25 are formed at four locations in the movable flange portion 23 concentrically with the fixed flange screw holes 21, and the fixing bolts 6 can be inserted into each of these communication holes 25. Further, on a concentric circle of the communication hole 25 centered on the flow path 8, another plurality of communication holes 25 are formed at equal intervals, and a mounting bolt/nut 26 can be attached to each of these communication holes 25. It has become.

The fixing bolts 6 are provided at four locations, with one end temporarily attached to the communication hole 25 of the movable flange 3 by a fixing nut 7 and the other end screwed into the screw hole 21 of the fixed flange 10. As a result, the movable flange 3 can move forward and backward with respect to the valve box 2 while being centered around the flow path 8 by the four fixing bolts 6 and fixing nuts 7.

As shown in FIG. 8, a hexagonal bolt 9 is screwed and fixed to the other end of the fixing bolt 6 from the movable flange 3 attachment side, and the head 9a of the hexagonal bolt 9 is turned using a general tool or the like. This allows the fixing bolt 6 to move forward and backward. Further, the head 9a prevents the fixing bolt 6 from coming off from the fixing flange 10. Further, a cap 27 made of resin is attached to cover the head 9a, and the fixing bolt 6 can be rotated with fingers from above the cap 27 for fast forwarding.

1 to 3, the long bolt 4 has a male thread 30 formed on its outer periphery, and in a state where the male thread 30 is screwed into the female threaded portion 24, the fixed flange 10 is attached to the movable flange portion 23 by a fixing nut 31. It is fixed at two locations facing the insertion hole 20 of. The long bolt 4 is formed to have a length that is slightly left over when the insertion cylinder portion 22 of the movable side flange 3 is inserted into the inside of the valve box 2. The telescopic nut 5 is screwed into the corresponding part. The number of long bolts 4 is two for a nominal diameter of 350A or less, and four for a nominal diameter of 400A or more, and is changed as appropriate depending on the nominal diameter of the valve body 1.

The telescoping nut 5 is formed into a cylindrical shape, and has a female thread 32 formed on the inner circumference side to be screwed into the male thread 30 of the long bolt 4, while the outer periphery near the center of the telescoping nut 5 has a fixed flange insertion hole 20. The extension nut 5 is rotatably attached to the insertion hole 20 . The telescopic nut 5 has its outer circumferential side inserted into the fixed flange insertion hole 20 with the female screw 30 screwed into the male thread 32, so that when the telescoping nut 5 is rotated, it does not move against the fixed flange 10. As a result, the movable flange 3 can be expanded and contracted, thereby making it possible to expand and contract the distance W between the connecting flange 11 and the movable flange portion 23.

The front and rear ends of the telescopic nut 5 are provided with an elongated engaging portion 40 and a reduced engaging portion 41, each having a diameter larger than the portion inserted into the insertion hole 20. One side is provided so as to be engageable with the side surface of the fixed flange 10. Therefore, the telescopic nut 5 is prevented from coming off from the fixed flange 10, and even when the movable flange 3 expands and contracts relative to the fixed flange 10, one of the telescopic nuts 5 is not engaged with the fixed flange 10. Retained. Note that washers 47 are provided between the elongated engagement portion 40 and the fixed flange 10 and between the reduced engagement portion 41 and the fixed flange 10 in order to protect the painted surface and reduce frictional resistance.

At this time, when the distance in the axial direction from the engagement surface of the extension engagement part 40 and the fixed flange 10 to the engagement surface of the reduced engagement part 41 and the fixed flange 10 is L, and the thickness of the fixed flange 10 is t. , are formed so that the distance L is longer than the thickness t (distance L>thickness t). Therefore, when connecting the external piping 13 to the movable flange 3 while the movable flange 3 is extended, the telescopic nut 5 is placed on the extended side with respect to the fixed flange 10 due to the difference between the distance L and the thickness t. A movable gap S is formed. In this way, by making the telescopic nut 5 movable to the extension side through the gap S, a seal having a rubber thickness M can be formed between the movable flange portion 23 and the flange portion 14 of the external piping 13, as shown in FIG. When the gasket 42 is interposed, the tightening margin N of the gasket 42 is ensured.

In this example, as shown in FIGS. 3 to 5, the extension engagement portion 40 is composed of an engagement nut, and this engagement nut 40 is screwed and fixed to the rear end side of the extension nut 5. On the other hand, the reduction engaging portion 41 is composed of a flange portion, and the flange portion 41 is formed on an end surface of a nut operating portion 43 provided on the distal end side of the telescoping nut 5. The nut operation part 43 is formed in an elongated shape, and the above-mentioned female screw 32 is formed on a part of its inner periphery.

A polygonal part 44 such as a hexagonal or octagonal shape is formed on the outer peripheral side of the tip of the nut operating part 43, and the nut operating part 43 can be rotated by grasping this polygonal part 44 with fingers or a tool (not shown). ing. A male threaded portion 45 is formed on the distal end side of the nut operating portion 43, and a female threaded portion 46 formed on the inner periphery of the engagement nut 40 is screwed into this male threaded portion 45, thereby fixing them together. Thereby, when the nut operation part 43 is rotated, the entire telescopic nut 5 is rotated with respect to the fixed flange 10. The male threaded portion 45 and the female threaded portion 46 are threaded in a tightening direction during the extension operation to prevent loosening.

1 and 2, a valve body 51 is rotatably attached within the valve box 2 via a stem 50, and a flow path 8 is provided so as to be openable and closable by rotating the valve body 51 through 90°. A manual operation mechanism 52 connected to a stem 50 and equipped with an internal deceleration mechanism (not shown) is mounted on the upper part of the valve box 2. By rotating a handle operation section 53 provided on this manual operation mechanism 52, the valve can be operated. The body 51 can be opened and closed.

In the above embodiment, the telescoping nut 5 is provided with the engagement nut 40 and the nut operation part 43, and these are combined and integrated. As long as the movable flange 3 can be extended and contracted with respect to the fixed flange 10 by rotation, the components and shape thereof are not limited.

Next, the procedure and operation when connecting the valve body 1 of the above-described embodiment to the external piping 13 will be explained.
In this example, a case will be described in which a butterfly valve that is connected between predetermined surfaces of the existing external piping 13 and needs to be replaced is replaced with the valve body 1 of the above embodiment. Before connecting the valve body 1, the old butterfly valve is removed from the existing external piping 13 in advance.

FIG. 3 shows the state of the valve body 1 before connection. In order to connect from this state, first grasp the polygonal part 44 of the nut operating part 43 and rotate it clockwise as shown by the arrow in FIG. Do it like this. As a result, while the entire telescopic nut 5 rotates idly with respect to the fixed flange 10, the telescopic nut 5 moves to the left in the figure due to the screw engagement between the male thread 30 and the female thread 32 with respect to the long bolt 4, and is reduced. The end surface side of the engaging portion (flange portion) 41 abuts on the right end surface of the fixed flange 10 .

When the telescopic nut 5 is further rotated clockwise, the leftward movement of the telescopic nut 5 is restricted by the abutment of the collar 41 against the fixed flange 10, so that the long bolt 4 is moved to the right with respect to the telescopic nut 5. As a result, the movable flange 3 fixed integrally with the long bolt 4 moves to the right with respect to the fixed flange 10, and the movable flange portion 23 of the movable flange 3 and the connecting flange 11 The distance W between the two surfaces is reduced. In this state, the valve body 1 is inserted between the predetermined surfaces of the external pipes 13, 13.

Then, the connecting flange 11 of the valve box 2 is connected to the flange portion 14 of the external piping 13 disposed on the right side of the valve body 1 via a gasket 42 with a plurality of mounting bolts and nuts 26. Thereby, the right side connection flange 11 and the flange portion 14 of the external pipe 13 are fixed in a sealed state.

Next, in FIGS. 1 and 2, on the left side of the valve body 1, the four fixing bolts 6 attached to the fixed flange 10 are inserted through the communication hole 25 of the movable side flange 3 to the flange of the external piping 13 arranged on the left side. They are inserted into the mounting holes 54 formed in the portions 14, and the valve body 1 is temporarily fixed in a centered state between the external piping 13 on both the left and right sides. At this time, the sealing gasket 42 is sandwiched between the movable side flange 3 and the flange part 14 of the external piping 13, and the gasket 42 is lightly sandwiched between the movable side flange 3 and the external piping 13. becomes. Although the fixing bolts 6 are provided at four locations in this embodiment, the number may be changed as appropriate depending on the nominal diameter and pressure.

When the nut operating part 43 is rotated counterclockwise from the state shown in FIG. As shown in FIG. 5, the end surface side of the elongated engagement portion (engagement nut) 40 comes into contact with the left side surface of the fixed flange 10.

When the telescopic nut 5 is further rotated to the left, the engagement nut 40 comes into contact with the fixed flange 10, which restricts the movement of the telescopic nut 5 in the right direction. Move as if being pushed to the left. As a result, the movable flange 3 integrated with the long bolt 4 moves to the left, and the distance W between the movable flange portion 23 and the connecting flange 11 is extended to enable adjustment between the predetermined surfaces.

In this case, by setting the distance L to be longer than the thickness t of the fixed flange, when the movable flange 3 is in the extended state in FIG. A gap S is formed between them. This allows the movable flange 3 to move to the left with respect to the fixed flange 10 along with the telescopic nut 5 by this gap S, thereby ensuring the tightness N of the gasket 42 shown in FIG. 7.

From this, in FIG. 6, after the movable flange 3 is extended, the fixed flange 10 and the flange portion 14 of the left external piping 13 are tightened with the fixed bolt 6, fixed nut 7, and mounting bolt/nut 26. , the movable flange 3, the long bolt 4, and the telescopic nut 5 slide to the left so as to be drawn toward the external piping flange portion 14. At this time, by setting the gap S to be larger than the tightening allowance N of the gasket 42 in advance, sealing performance between the movable side flange 3 and the external piping flange part 14 is ensured while the gasket 42 is crushed by the tightening allowance N. You can connect with it. By tightening and fixing the communication holes 25 other than the communication holes 25 into which the fixing bolts 6 are inserted and the mounting holes 54 formed in the external piping flange portion 14 with the mounting bolts and nuts 26, the flange The adhesion between them is improved, and the sealing performance when the gasket 42 is tightened is further improved.

As described above, by rotating the telescopic nut 5, the movable flange 3 can be expanded and contracted with respect to the fixed flange 10, and the distance W between the connecting flange 11 and the movable flange portion 23 can be expanded and contracted, and the valve body 1 can be expanded and contracted. In either case, the distance W can be adjusted and connected to the external piping 13 with a single operation by rotating the telescopic nut 5 clockwise or counterclockwise, which not only improves operability but also allows the user to rotate the telescopic nut 5 easily. Since the distance W between the surfaces can be expanded and contracted simply by moving, work errors can be reduced.
Moreover, by alternately loosening or tightening the two telescoping nuts 5, the movable flange 3 can be easily expanded and contracted while being maintained in a substantially horizontal state, allowing for reliable and accurate connection to the external piping 13 in a centered state. becomes. In addition, the operability with a ratchet wrench etc. is improved.

When rotating the telescopic nut 5 in either the left or right direction, an engagement nut (extensible engagement portion) 40 on the rear end side of the telescopic nut 5 or a nut operating portion 43 provided on the tip end side of the telescopic nut 5 is used. The movable side fixed to the long bolt 4 corresponds to the amount of rotation when the telescopic nut 5 is rotated with the flange (reduced engagement part) 41 in contact with the end face of the fixed flange 10 to prevent it from coming off. The flange 3 can be expanded and contracted little by little while being finely adjusted to set accurate face-to-face dimensions.

The above-mentioned telescopic nut 5 is attached with the cylindrical portion of the telescopic nut 5 inserted into the insertion hole 20 of the fixed flange 10, so when the telescopic nut 5 moves in the telescopic direction with respect to the fixed flange 10, There is no fear that the insertion hole 20 will be scraped by the outer periphery of the telescopic nut 5, and even if a coating is provided, it will be prevented from peeling off and rust will occur. The smooth rotation of the telescopic nut 5 provides high operability.

The telescopic nut 5 can be easily manufactured without any special processing, and can be easily attached to the fixed flange 10 by screwing the nut operation part 43 and the engagement nut 40. Furthermore, even if an existing or new face-to-face telescopic valve has a shape different from the valve body 1 of the above embodiment, if the insertion hole for the long bolt 4 is formed in the fixed flange, this insertion hole can be used. It is also possible to attach a telescoping nut 5 to the surface and provide a configuration in which the distance between the surfaces can be adjusted using the telescoping nut 5.

In the above embodiment, the long bolt 4 is made of stainless steel, and the telescopic nut 5 is made of brass. This is because galling is less likely to occur if these are dissimilar metals. In addition, since the color of the telescopic nut 5 is different from that of the other bolts and nuts 26, it is difficult to make a mistake in the connection procedure between the valve body 1 and the external piping 13, and not only can the connection be made reliably and accurately in the centered state, Work errors can be prevented and work time can be shortened.

The telescopic structure of the face-to-face telescopic valve of the present invention can be widely applied to valves other than butterfly valves, and can be used, for example, to gate valves, pressure reducing valves, check valves, and other various valves. In either case, the valve of the present invention can be connected not only to horizontal piping but also to vertical piping. Also at this time, by connecting the valve body to the flange portion 14 of the external pipe 13 with the fixing bolt 6, the valve body can be placed in a predetermined state and sealing performance can be maintained reliably.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above, and the present invention is not limited to the scope of the invention described in the claims of the present invention. It is possible to make various changes.

1 Valve body 2 Valve box 3 Movable flange 4 Long bolt 5 Expandable nut 10 Fixed flange 13 External piping 40 Engagement nut (extension engagement part)
41 Flange part (reduced engagement part)
43 Nut operation part L Distance N Tightening allowance S Gap t Thickness of fixed flange W Between surfaces

Claims (3)

A movable side flange is provided on a fixed flange of a valve box so as to be movable back and forth, and the valve can expand and contract between surfaces, and this valve is provided with a fixing bolt that fixes the fixed flange and the movable side flange, and the fixing bolt is , one end side can be inserted into a communication hole formed in the movable side flange, the other end side is screwed into a screw hole formed in the fixed flange, and a head is attached to the end of the fixed bolt on the fixed flange side. A fixing device for a face-to-face telescopic valve, characterized by screwing and fixing a bolt. The device for fixing a face-to-face telescopic valve according to claim 1, wherein the head bolt is a hexagonal bolt. 3. The interplane telescopic valve fixing device according to claim 2, wherein the head of the hexagonal bolt is covered with a resin cap.

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