JP6963952B2 - Gate valve - Google Patents

Description

The present invention relates to a sluice valve having a valve body sheet and a valve box sheet.

Conventionally, as a sluice valve of this type, as shown in FIGS. 17 and 18, for example, a valve body 101, a valve rod 102, and a valve body that moves up and down guided by a guide groove provided in the valve box 101. Some have 104 and. The valve box 101 has openings 105 formed at both ends, a valve box flow path 106 communicating between both openings 105, and a valve body accommodating chamber 107. The valve body accommodating chamber 107 has an internal space 108 for the valve body 104 to move in the opening direction O.

The valve body 104 is connected to the valve rod 102 via a screw top 109, and moves up and down by the rotation of the valve rod 102.

A pair of valve box seats 110a and 110b facing each other in the flow path axial center direction A of the valve box flow path 106 are provided in the valve box 101. Further, a pair of valve body seats 112a and 112b that are in pressure contact with the valve box seats 110a and 110b at the closed position Ps are provided on the valve body 104.

The valve body 104 is a connecting wall provided between one partition wall 114a provided with one valve body sheet 112a, the other partition wall 114b provided with the other valve body sheet 112b, and both partition walls 114a and 114b. It has 115 and. A gap 116 open to the outer periphery of the valve body 104 is formed between one partition wall 114a and the other partition wall 114b.

According to this, as shown in FIG. 17, by lowering the valve body 104 to the closed position Ps, one valve body sheet 112a is pressed against one valve box sheet 110a, and the other valve body sheet 112b is in contact with the other. The valve box flow path 106 is shut off by the valve body 104 by pressure contacting the valve box sheet 110b.

In this state, even if an external force acts on the valve box 101 and the valve box 101 is distorted and the valve box seats 110a and 110b are deformed, the rigidity of the valve body 104 is reduced at the portion of the connecting wall 115. The connecting wall 115 is bent and deformed to absorb the strain of the valve box 101, whereby the valve body sheets 112a and 112b are deformed following the valve box sheets 110a and 110b, and the valve body sheets 112a and 112b and the valve It is possible to prevent a gap from being generated between the box sheets 110a and 110b and maintain the water-stopping property.

The sluice valve as described above is described in, for example, Patent Document 1 below.

JP 2000-28012

However, in the above-mentioned conventional type, the narrower the cross-sectional area of the connecting wall 115 of the valve body 104, the lower the rigidity of the valve body 104 and the easier it is to deform. When a large external force that is not normally considered is applied to the valve box 101 to cause distortion in the valve box 101, the strength of the valve body 104 is insufficient and the valve body 104 is damaged at the site of the connecting wall 115. There is a risk of doing so.

An object of the present invention is to provide a sluice valve capable of maintaining water stoppage and preventing damage to the valve body even when an external force acts on the valve box to cause distortion or the like. ..

In order to achieve the above object, the first invention is a sluice valve provided with a valve body in a valve box.
The valve box has openings formed at both ends, a valve box flow path communicating between both openings, and a valve body accommodating chamber.
The valve body storage chamber has an internal space for the valve body to move in the opening direction.
The internal space communicates from the valve box flow path in the opening direction of the valve body.
A pair of valve box seats facing each other in the direction of the flow path axis of the valve box flow path are provided in the valve box.
A pair of annular valve body sheets that are pressed against the valve box seat in the closed position are provided on the valve body.
The valve body has one valve plate portion provided with one valve body seat, the other valve plate portion provided with the other valve body seat, and a connecting portion provided between both valve plate portions.
An open gap is formed on the outer circumference of the valve body between one valve plate portion and the other valve plate portion.
The cross-sectional area of the connecting portion in the opening / closing direction of the valve body is set within a range of 30% or more and 70% or less of the area of the plane surrounded by one of the valve body sheets .
The cross-sectional area of the connecting portion included in the region on the opening direction side from the reference plane passing through the center of the valve body sheet and orthogonal to the opening / closing direction is larger than the cross-sectional area of the connecting portion included in the region on the closing direction side from the reference plane. , Is set to be narrower,
When the valve box seat is deformed while the valve body is deformed in the push-back direction when it is pushed back from the valve box seat in the closed position, the valve body follows the valve box seat and is deformed in the direction opposite to the push-back direction. If the amount when trying to return to the original shape is the deformable amount of the valve body,
The deformable amount of the valve body in the region on the opening direction side from the reference plane is larger than the deformable amount of the valve body in the region on the closing direction side from the reference plane .

According to this, by moving the valve body to the closed position, one valve body sheet is pressed against one valve box sheet, the other valve body sheet is pressed against the other valve box sheet, and the valve box flow path. Is blocked by the valve body.

In this state, even if an external force acts on the valve box and the valve box is distorted and the valve box seat is deformed, the rigidity of the valve body is reduced at the connection part, so that the connection part is deformed. Absorbs the distortion of the valve box, thereby preventing the valve body seat from deforming following the valve box seat and creating a gap between the valve body seat and the valve box seat, and providing water stoppage. Can be maintained.

At this time, since the cross-sectional area of the connecting portion in the opening / closing direction of the valve body is set within a range of 30% or more and 70% or less of the area of the plane surrounded by one of the valve body sheets, for example, an earthquake. Even if a large external force that is not normally considered is applied to the valve box and the valve box is distorted due to such factors, the strength of the valve body is not insufficient and the valve body is at the connection part. It can be prevented from being damaged.

Further, since the internal space of the valve body accommodating chamber communicates from the valve box flow path in the opening direction of the valve body, the valve box is structurally closed with the portion on the opening direction side where the internal space is formed opposite. It is more easily deformed by an external force than the part on the directional side. Therefore, for example, when a large external force that is not normally considered due to an earthquake or the like acts on the valve box and the valve box is distorted, the amount of deformation of the valve box seat is determined by the portion on the opening direction side having the internal space. It is larger than the part on the opposite closing direction side.

On the other hand, the cross-sectional area of the connecting portion included in the region on the opening direction side from the reference plane is set to be narrower than the cross-sectional area of the connecting portion included in the region on the closing direction side from the reference plane. Therefore, the rigidity of the valve body is lower in the portion included in the region on the opening direction side from the reference plane than in the portion included in the region on the closing direction side from the reference plane. Therefore, the deformable amount of the valve body sheet is larger in the region on the opening direction side from the reference plane than in the region on the closing direction side from the reference plane, whereby the deformation amount in the opening direction side portion of the valve box seat. Even if is larger than the amount of deformation in the opposite closed direction portion, the valve body seat is deformed sufficiently following the deformation of the valve box seat, and a gap is generated between the valve body seat and the valve box seat. Can be prevented.

In the sluice valve of the second invention, the cross-sectional shape of the connecting portion in the opening / closing direction of the valve body is circular.
The center in the radial direction of the connecting portion is set on the closing direction side with respect to the center of the valve body seat.
In the sluice valve of the third invention, the cross-sectional shape of the connecting portion in the opening / closing direction of the valve body is circular.
The cross-sectional shape of the outer peripheral portion of the connecting portion is an arc shape recessed inward in the radial direction of the connecting portion.

According to this, since the local stress generated at the base portion between the connection portion and the valve plate portion is dispersed, damage to the base portion can be prevented.

In the sluice valve according to the fourth invention, the cross-sectional shape of the connecting portion in the opening / closing direction of the valve body is circular.
The gap between one valve plate portion and the other valve plate portion is formed in a tapered shape that expands in the thickness direction of the valve body toward the radial outer side of the connecting portion.

According to this, since the outer peripheral edge of the valve plate portion of the valve body is easily deformed, the valve body sheet is easily deformed following the valve box sheet, and a gap is created between the valve body sheet and the valve box sheet. It can be prevented from occurring.

In the sluice valve in the fifth invention, the valve box can be connected to the pipe via a seismic joint.

According to this, even if a large external force that is not normally considered is applied due to an earthquake, it is possible to prevent the pipe from coming off the valve box.

In the sluice valve according to the sixth invention, the valve box has sockets at both ends.
The socket has an opening on the end face and has a lock ring and a lock ring mounting groove inside.
The lock ring is fitted into the lock ring mounting groove and
A reinforcing member is provided on the outer surface of the valve box over the formed portion of the lock ring mounting groove of one receiving port and the forming portion of the lock ring mounting groove of the other receiving port.

According to this, when a detaching force acts on the pipe due to an earthquake, the protrusion formed at the insertion port of the pipe engages with the lock ring from the inner side of the receiving port of the valve box, so that the pipe separates from the valve box. Can be prevented.

At this time, the detaching force acts on the valve box starting from the lock ring with which the protrusion is engaged. Therefore, by providing the reinforcing member over the formed portion of the lock ring mounting groove of one receiving port and the forming portion of the lock ring mounting groove of the other receiving port, the strength of the valve box against the withdrawal force is improved. , The amount of deformation of the valve box seat can be reduced.

In the sluice valve according to the seventh invention, the cross-sectional area of the connecting portion in the opening / closing direction of the valve body is within the range of 40% or more and 60% or less or 45% of the area of the plane surrounded by one of the valve body sheets. It is set within the range of 55% or less.
The sluice valve on the board.

In the sluice valve in the eighth invention, a valve rod insertion hole is formed in the valve body, and the sluice valve is formed.
The valve stem insertion hole penetrates the connection and
The cross-sectional area of the connecting portion in the opening / closing direction of the valve body including the valve rod insertion hole is set within the range of 50% or more and 95% or less of the area of the plane surrounded by one of the valve body sheets. It is a thing.

As described above, according to the present invention, even if an external force acts on the valve box with the valve body closed and the valve box is distorted and the valve box seat is deformed, the rigidity of the valve body is at the connection portion. The deformation of the connection part absorbs the distortion of the valve box, which causes the valve body seat to follow the valve box seat and deform, and between the valve body seat and the valve box seat. It is possible to prevent the formation of gaps and maintain the water stopping property.

At this time, since the cross-sectional area of the connecting portion in the opening / closing direction of the valve body is set within a range of 30% or more and 70% or less of the area of the plane surrounded by one of the valve body sheets, for example, an earthquake. Even if a large external force that is not normally considered is applied to the valve box and the valve box is distorted due to such factors, the strength of the valve body is not insufficient and the valve body is at the connection part. It can be prevented from being damaged.

It is sectional drawing of the sluice valve in the 1st Embodiment of this invention, and shows the state which the valve body is closed. The same is a cross-sectional view of the sluice valve, showing a state in which the valve body is opened. The same is a side view of a part of the sluice valve notched. The same is a plan view of a part of the sluice valve notched. The same is a perspective view of the valve body of the sluice valve. The same is a front view of the valve body of the sluice valve. The same is a side view of the valve body of the sluice valve. FIG. 6 is a view taken along the line XX in FIG. FIG. 7 is a view taken along the line XX in FIG. 7. Similarly, it is a front view of the valve body of the sluice valve, and the shaded portion shows the area of the circular plane surrounded by one valve body sheet. The same is a partially enlarged cross-sectional view of the valve body sheet and the valve box sheet of the sluice valve, showing how the valve body is deformed in the push-back direction at the closed position. Similarly, it is a partially enlarged cross-sectional view of the valve body seat and the valve box seat of the sluice valve. Shows how it is about to return. It is a side view of the valve body of the sluice valve in the 2nd Embodiment of this invention. It is a figure which shows the cross-sectional shape of the connection part of the valve body of the sluice valve in the 3rd Embodiment of this invention. It is a figure which shows the cross-sectional shape of the connection part of the valve body of the sluice valve in the 4th Embodiment of this invention. It is a figure which shows the cross-sectional shape of the connection part of the valve body of the sluice valve in the 5th Embodiment of this invention. It is sectional drawing of the conventional sluice valve, and shows the state which the valve body is closed. FIG. 17 is a view taken along the line XX in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
In the first embodiment, as shown in FIGS. 1 to 4, 1 is a pipe line buried in the ground, and a sluice valve 4 is connected between one pipe 2 and the other pipe 3. ing. The sluice valve 4 has a valve box 11, a valve body 12 provided in the valve box 11, a valve rod 13 for moving the valve body 12 to the closed position Ps and an open position Po, and a lid body 14. There is.

The valve box 11 and one pipe 2 are connected via one seismic joint 15. The seismic joint 15 includes one receiving port 16 provided at one end of the valve box 11, an insertion port 5 provided at the end of one pipe 2, a lock ring 17, a lock ring holder 18. A ring-shaped seal member 19 made of an elastic material such as rubber, an annular push ring 20 that presses the seal member 19 toward the back of the socket 16, and a connecting tool 21 that connects the push ring 20 to the end of the socket 16. It has a protrusion 6 formed on the outer periphery of the insertion port 5. The insertion port 5 of one pipe 2 is inserted into one receiving port 16 of the valve box 11.

The receiving port 16 has an opening 22 on the end surface and a lock ring mounting groove 23 inside. The seal member 19 is pushed into the depth of the receiving port 16 by the push ring 20, is sandwiched between the outer peripheral surface of the insertion port 5 and the inner peripheral surface of the receiving port 16, and is compressed in the radial direction. As a result, the outer peripheral surface of the insertion port 5 and the inner peripheral surface of the receiving port 16 are sealed.

The connector 21 has a plurality of T-type bolts 24 and nuts 25, and the push ring 20 is connected to the end flange of the receiving port 16 via the T-type bolt 24 and the nut 25.

Further, the lock ring 17 is fitted into the lock ring mounting groove 23 via the lock ring holder 18. When a detaching force F acts on one of the pipes 2 due to an earthquake or the like, the protrusion 6 of the insertion port 5 engages with the lock ring 17 from the back side of the receiving port 16, so that the one pipe 2 becomes the valve box 11. It is prevented from being separated from one of the receiving ports 16.

Further, the valve box 11 and the other pipe 3 are connected to each other via the other seismic joint 27. The other seismic joint 27 has the same configuration as the one seismic joint 15.

Further, the valve box 11 is formed in the cylindrical body portion 31 constituting the receiving port 16, the openings 22 formed at both ends of the body portion 31 (that is, the end faces of the receiving port 16), and the body portion 31. It has a valve box flow path 32 that communicates between both openings 22 and a valve body accommodating chamber 33.

The valve body accommodating chamber 33 is a square cylindrical member, and is erected upward on the upper portion of the body portion 31. The valve body accommodating chamber 33 has an internal space 34 for the valve body 12 to move in the opening direction O (upward direction). The internal space 34 communicates with the valve box flow path 32 in the opening direction O (upward direction) of the valve body 12.

The lid body 14 is attached to the upper end portion of the valve body accommodating chamber 33. Further, the valve rod 13 is rotatably held in a state of penetrating the lid body 14 and plunging into the internal space 34 of the valve body accommodating chamber 33. The valve stem 13 has a male screw 35 on the outer peripheral surface and is screwed into a spinning top member 36 having a female screw.

A pair of annular valve box seats 40, 41 facing each other in the flow path axial center direction A of the valve box flow path 32 are provided in the valve box 11. The valve box seats 40 and 41 are arranged with respect to the flow path axis 37 so that the distance between the valve box seats 40 and 41 is wider toward the opening direction O side (upper side) and narrower toward the closing direction S side (lower side). It is slightly inclined.

Further, as shown in FIG. 1, a pair of annular valve body sheets 43, 44 that are in pressure contact with the valve box sheets 40, 41 at the closed position Ps are provided on the valve body 12. The valve box seats 40 and 41 and the valve body seats 43 and 44 are each made of metal such as stainless steel.

As shown in FIGS. 5 to 9, the valve body 12 has a disk-shaped valve plate portion 46 having one valve body seat 43 and a disk-shaped other valve having the other valve body seat 44. Guide the plate portion 47, the connecting portion 48 provided between the valve plate portions 46, 47, the holder members 49, 50 for holding the frame member 36, and the valve body 12 in the opening / closing directions O, S (vertical direction). It has guides 51 and 52 to be used.

As shown in FIG. 7, the valve body 12 has a wedge shape in which the thickness becomes thinner toward the S side (lower side) in the closing direction in a side view.

One holder member 49 is provided above one valve plate portion 46, and the other holder member 50 is provided above the other valve plate portion 47. The top member 36 is fitted into both valve plate portions 46 and 47 and is held by the valve body 12.

Further, one guide 51 is provided on both side portions of one valve plate portion 46, and the other guide 52 is provided on both side portions of the other valve plate portion 47. A pair of guide protrusions 54 are provided in the valve box 11, and the guide protrusions 54 are inserted between one guide 51 and the other guide 52.

By rotating the valve rod 13, the frame member 36 moves in the axial direction (vertical direction) in a state of being screwed into the valve rod 13, so that the valve body 12 moves in the opening / closing directions O and S together with the frame member 36. .. At this time, the valve body 12 is guided in the opening / closing directions O and S via the guides 51 and 52 and the guide protrusion 54.

A gap 55 opened on the outer periphery of the valve body 12 is formed between one valve plate portion 46 and the other valve plate portion 47. Further, the valve body 12 is formed with a valve rod insertion hole 56 penetrating in the opening / closing directions O and S (vertical direction). The valve stem insertion hole 56 penetrates the connection portion 48. As shown in FIG. 9, the cross-sectional shape of the connecting portion 48 in the radial direction of the valve body 12 is an arc shape obtained by dividing a circle having a predetermined radius r from the center 57 of the connecting portion 48 into two by the valve rod insertion hole 56. be.

The cross-sectional area B (the area of the cross-sectional area shown by the diagonal line in FIG. 9) of the connecting portion 48 in the radial direction (opening / closing direction) of the valve body 12 is surrounded by one of the valve body sheets 43 (or the valve body sheet 44). It is set within a range of 30% or more and 70% or less of the area C of the circular plane (the area of the area shown by the diagonal line in FIG. 10). The numerical values of 30% or more and 70% or less may be more preferably set to 40% or more and 60% or less, and may be set to 45% or more and 55% or less as the optimum range. good. It should be noted that each of the above numerical values is based on the results obtained by repeating trial production and experiments.
Further, as shown in FIG. 9, the center 57 of the connecting portion 48 in the radial direction is set lower than the center 58 of the valve body seats 43 and 44, passes through the center 58 of the valve body seats 43 and 44, and opens and closes. The cross-sectional area b1 of the connecting portion 48 included in the region on the opening direction O side (upper side) from the virtual reference plane 60 orthogonal to the directions O and S is in the region on the closing direction S side (lower side) from the reference plane 60. It is set narrower than the cross-sectional area b2 of the included connection portion 48. The cross-sectional area B of the connecting portion 48 is the sum of the cross-sectional area b1 and the cross-sectional area b2.

Further, as shown in FIGS. 7 and 8, the cross-sectional shape of the outer peripheral portion of the connecting portion 48 is a semicircular shape (an example of an arc shape) recessed inward in the radial direction of the valve body 12.

Further, as shown in FIGS. 1 to 4, on the outer surface of the valve box 11, a portion forming the lock ring mounting groove 23 of one receiving port 16 and a forming portion of the lock ring mounting groove 23 of the other receiving port 16 are formed. A plurality of reinforcing members 62 to 65 (ribs) are provided. Of these, the lower surface reinforcing member 62 is formed on the bottom portion of the valve box 11, and the side surface reinforcing members 63 and 64 are formed on both side portions of the valve box 11. Further, the upper surface reinforcing member 65 is formed on the upper portion of the valve box 11 and is divided by the valve body accommodating chamber 33.

The operation in the above configuration will be described below.

By connecting a handle (not shown) to the tip of the valve stem 13 and operating the handle to turn the valve stem 13 in the opening direction, the valve body 12 is opened together with the spinning top member 36 as shown in FIG. It moves to O (upward) and reaches the open position Po. As a result, the valve box flow path 32 is opened, and the fluid flows between the pipes 2 and 3 and the inside of the valve box 11 of the sluice valve 4. At this time, the valve body 12 is housed in the internal space 34 of the valve body accommodating chamber 33 at the open position Po, and the valve rod 13 is inserted into the valve rod insertion hole 56 of the valve body 12.

Further, by operating the handle in the opposite direction and turning the valve stem 13 in the closing direction, the valve body 12 moves in the closing direction S (downward) together with the spinning top member 36 to reach the closing position Ps, as shown in FIG. Reach. As a result, one valve body sheet 43 is pressed against one valve box sheet 40, the other valve body sheet 44 is pressed against the other valve box sheet 41, and the valve box flow path 32 is blocked by the valve body 12. NS. At this time, the valve stem 13 is removed from the valve stem insertion hole 56 of the valve body 12.

Further, when a detachment force F (an example of an external force) acts on one of the pipes 2 due to an earthquake, the protrusion 6 of the insertion port 5 of the one pipe 2 is unilaterally from the back side in the one receiving port 16 of the valve box 11. By engaging with the lock ring 17 of the above, it is possible to prevent one of the pipes 2 from being separated from the valve box 11.

Similarly, when a detachment force F (an example of an external force) acts on the other pipe 3, the protrusion 6 of the insertion port 5 of the other pipe 3 is from the back side in the other receiving port 16 of the valve box 11. By engaging with the other lock ring 17, it is possible to prevent the other pipe 3 from coming off the valve box 11.

Even if the valve box 11 is distorted due to the detachment force F due to the earthquake acting on the valve box 11 as described above in the state where the valve body 12 reaches the closed position Ps, even if one of the valve box seats 40 is deformed. Since the rigidity of the valve body 12 is reduced at the position of the connecting portion 48, the strain of the valve box 11 is absorbed by the deformation of the connecting portion 48, whereby one valve body seat 43 becomes one valve box seat. It is deformed following 40 to prevent a gap from being generated between one valve body seat 43 and one valve box seat 40, and the one valve body seat 43 and one valve box seat 40 The water stoppage between can be maintained.

Similarly, it is possible to prevent the other valve body seat 44 from being deformed following the other valve box seat 41 and creating a gap between the other valve body seat 44 and the other valve box seat 41. The water stoppage between the other valve body seat 44 and the other valve box seat 41 can be maintained.

At this time, the cross-sectional area B of the connecting portion 48 in the radial direction of the valve body 12 (see the shaded portion in FIG. 9) is the area C of the circular plane surrounded by one of the valve body sheets 43 (or the valve body sheet 44). Since it is set within the range of 30% or more and 70% or less of (see the shaded portion in FIG. 10), the detachment force F as described above acts on the valve box 11 to cause distortion in the valve box 11. Even in this case, the strength of the valve body 12 is not insufficient, and it is possible to prevent the valve body 12 from being damaged at the connection portion 48.

As shown in FIG. 1, when the valve body 12 reaches the closed position Ps, the pushing force by the valve rod 13 acts on the valve body 12 in the closing direction S (downward direction). Therefore, as shown in FIG. 11, the valve body 12 is slightly deformed in the push-back direction 67 pushed back from the valve box seats 40 and 41, and at the closed position Ps, the valve body 12 is pushed back in the push-back direction as described above. It is kept in a deformed state of 67. The push-back direction 67 and the direction of the withdrawal force F are opposite to each other.

In this state, an earthquake occurs, and as shown in FIG. 12, the release force F acts on the valve box 11, so that even if one of the valve box seats 40 is slightly deformed in the direction of the release force F, the valve body 12 Is deformed in the push-back direction 67 in advance, so that the valve body 12 is deformed in the direction 68 opposite to the push-back direction 67 and tries to return to the original shape. As a result, one valve body seat 43 is deformed in the direction of the withdrawal force F following the one valve box seat 40, and a gap is generated between the one valve body seat 43 and the one valve box seat 40. Can be prevented.

Similarly to the above, even when the other valve box seat 41 is slightly deformed in the direction of the withdrawal force F, the other valve body seat 44 follows the other valve box seat 41 in the direction of the withdrawal force F. It is possible to prevent the deformation and the formation of a gap between the other valve body seat 44 and the other valve box seat 41.

Further, as shown in FIG. 2, since the internal space 34 of the valve body accommodating chamber 33 communicates from the valve box flow path 32 in the opening direction O (upward direction), the valve box 11 is structurally in the internal space 34. The portion on the O side (upper side) in the opening direction in which the is formed is more easily deformed with respect to the detaching force F than the portion on the S side (lower side) in the opposite closing direction. Therefore, as shown in FIG. 1, when the detaching force F acts on the valve box 11 and the valve box 11 is distorted, the amount of deformation of the valve box seats 40 and 41 is on the opening direction O side (upper side). The portion of is larger than the portion on the S side (lower side) in the opposite closing direction.

On the other hand, as shown in FIG. 9, by setting the center 57 of the connecting portion 48 lower than the center 58 of the valve plate portions 46 and 47, the area from the reference surface 60 to the O side (upper side) in the opening direction is set. The cross-sectional area b1 of the connecting portion 48 included in is set narrower than the cross-sectional area b2 of the connecting portion 48 included in the region on the closing direction S side (lower side) from the reference surface 60. As a result, the rigidity of the valve body 12 is higher than that of the portion included in the region on the opening direction O side (upper side) from the reference surface 60 than the portion included in the region on the closing direction S side (lower side) from the reference surface 60. descend. Therefore, the deformable amount of the valve body seats 43 and 44 is such that the region on the opening direction O side from the reference surface 60 is larger than the region on the closing direction S side from the reference surface 60, whereby each valve box seat. Even if the amount of deformation in the portion of 40, 41 on the O side (upper side) of the opening direction is larger than the amount of deformation in the portion on the opposite closing direction S side (lower side), the valve body seats 43 and 44 are each valve box seat. It deforms sufficiently following the deformation of 40 and 41, and there are gaps between one valve body seat 43 and one valve box seat 40 and between the other valve body seat 44 and the other valve box seat 41. It can be prevented from occurring.

The deformable amount of the valve body sheets 43 and 44 corresponds to the deformable amount when the valve body 12 is deformed in advance in the push-back direction 67.

Further, as shown in FIGS. 7 and 8, since the cross-sectional shape of the outer peripheral portion of the connecting portion 48 is a semicircular shape recessed inward in the radial direction of the valve body 12, the connecting portion 48 and one of the valve plate portions 46 The local stress generated at the base portion of and the local stress generated at the base portion between the connecting portion 48 and the other valve plate portion 47 are dispersed, and damage to the root portion can be prevented.

Further, the release force F acts on the valve box 11 starting from the lock ring 17 with which the protrusions 6 of the pipes 2 and 3 are engaged. Therefore, as shown in FIGS. 1 to 4, each of the reinforcing members 62 to 65 is formed by forming a lock ring mounting groove 23 of one receiving port 16 and forming a lock ring mounting groove 23 of the other receiving port 16. The strength of the valve box 11 with respect to the withdrawal force F can be improved, and the amount of deformation of the valve box seats 40 and 41 can be reduced. Further, reinforcing members are provided between the formed portion of one lock ring mounting groove 23 and the end face of one receiving port 16 and between the forming portion of the other lock ring mounting groove 23 and the end face of the other receiving port 16. It can be unnecessary.

(Second Embodiment)
In the second embodiment, as shown in FIG. 13, the gap 55 between one valve plate portion 46 and the other valve plate portion 47 is in the radial direction of the valve body 12 over the entire circumference of the valve body 12. The outer side is formed in a tapered shape that expands in the thickness direction T of the valve body 12.

According to this, since the outer peripheral edge portions of the valve plate portions 46 and 47 are easily deformed, the valve body seats 43 and 44 are easily deformed following the valve box seats 40 and 41, and one of the valve bodies is easily deformed. It is possible to prevent gaps from being generated between the seat 43 and one valve box seat 40 and between the other valve body seat 44 and the other valve box seat 41.

(Third Embodiment)
In the third embodiment, as shown in FIG. 14, the center 57 of the connecting portion 48 is located at the same position as the center 58 of the valve body seats 43 and 44, and the cross-sectional shape of the connecting portion 48 is from the centers 57 and 58. A circle having a predetermined radius r is divided into two by a valve rod insertion hole 56, and the upper portion is horizontally removed to form an arc shape.

As a result, the cross-sectional area b1 of the connecting portion 48 included in the region from the virtual reference surface 60 passing through the common centers 57 and 58 and orthogonal to the opening / closing directions O and S to the opening direction O side (upper side) becomes the reference surface. It is set narrower than the cross-sectional area b2 of the connecting portion 48 included in the region from 60 to the S side (lower side) in the closing direction.

According to this, the same actions and effects as those of the first embodiment described above can be obtained.

(Fourth Embodiment)
The fourth embodiment is a modification of the third embodiment described above, and as shown in FIG. 15, the connecting portion 48 included in the region on the O side (upper side) of the opening direction from the reference surface 60. The radius of curvature of the outer peripheral edge and the radius of curvature of the outer peripheral edge of the connecting portion 48 included in the region on the S side (lower side) in the closing direction from the reference surface 60 are different.

As a result, the cross-sectional area b1 of the connecting portion 48 included in the region on the opening direction O side (upper side) from the reference surface 60 is included in the region on the closing direction S side (lower side) from the reference surface 60. It is set narrower than the cross-sectional area b2 of.

According to this, the same actions and effects as those of the first embodiment described above can be obtained.

(Fifth Embodiment)
In the fifth embodiment, the valve body sheet 43 (or the valve body sheet 44) having the cross-sectional area B (the area of the cross-sectional area shown by the diagonal line in FIG. 9) of the connecting portion 48 in the radial direction of the valve body 12 is either one. ) Is set within a range of 30% or more and 70% or less of the area C (the area of the area shown by the diagonal line in FIG. 10) of the circular plane surrounded by), and as shown in FIG. The area of a circular plane in which the cross-sectional area D (the area of the cross-sectional area shown by the diagonal line in FIG. 16) of the connecting portion 48 including the insertion hole 56 is surrounded by one of the valve body sheets 43 (or the valve body sheet 44). It is set within the range of 50% or more and 95% or less of C (the area of the area shown by the diagonal line in FIG. 10).

The numerical values of 50% or more and 95% or less may be more preferably set to 65% or more and 95% or less, and may be set to 80% or more and 95% or less as the optimum range. good.

In each of the above embodiments, as an example of the external force acting on the valve box 11, the detaching force F generated by the earthquake is mentioned, but the detaching force F is not limited to such a detaching force F.

In each of the above embodiments, as shown in FIG. 1, receiving ports 16 are provided at both ends of the valve box 11, and the insertion ports 5 of the pipes 2 and 3 are inserted into the receiving ports 16 of the valve box 11. However, insertion ports 5 are provided at both ends of the valve box 11, one insertion port 5 of the valve box 11 is inserted into a receiving port 16 formed in one pipe 2, and the other insertion port 5 of the valve box 11 is inserted. It may be inserted into the receiving port 16 formed in the other tube 3. Alternatively, the receiving port 16 may be provided at any end of the valve box 11, and the insertion port 5 may be provided at the opposite end.

In each of the above embodiments, the opening / closing directions O and S are set in the vertical direction, but the opening / closing directions are not limited to the vertical direction. Further, the cross-sectional shape of the connecting portion 48 is not limited to any of the shapes shown in FIGS. 9, 14, and 15, and the connecting portion included in the area on the O side (upper side) in the opening direction from the reference surface 60. The cross-sectional area b1 of 48 may be set narrower than the cross-sectional area b2 of the connecting portion 48 included in the region on the S side (lower side) in the closing direction from the reference surface 60.

2, 3 Pipe 4 Gate valve 11 Valve box 12 Valve body 15, 27 Seismic joint 16 Receptacle 17 Lock ring 22 Opening 23 Lock ring mounting groove 32 Valve box flow path 33 Valve body accommodation chamber 34 Internal space 40, 41 Valve box Seat 43,44 Valve body Seat 46, 47 Valve plate part 48 Connection part 55 Gap 58 Valve body center 60 Reference surface 62 to 65 Reinforcing member A Flow path axial center direction B Cross-sectional area of connection b1 Cross-sectional area of connection b2 Cross-sectional area of connection part C Area of circular plane D Cross-sectional area of connection part including valve rod insertion hole T Thickness direction of valve body Ps Fully closed position O Opening direction S Closing direction

Claims (8)

It is a sluice valve with a valve body inside the valve box.
The valve box has openings formed at both ends, a valve box flow path communicating between both openings, and a valve body accommodating chamber.
The valve body storage chamber has an internal space for the valve body to move in the opening direction.
The internal space communicates from the valve box flow path in the opening direction of the valve body.
A pair of valve box seats facing each other in the direction of the flow path axis of the valve box flow path are provided in the valve box.
A pair of annular valve body sheets that are pressed against the valve box seat in the closed position are provided on the valve body.
The valve body has one valve plate portion provided with one valve body seat, the other valve plate portion provided with the other valve body seat, and a connecting portion provided between both valve plate portions.
An open gap is formed on the outer circumference of the valve body between one valve plate portion and the other valve plate portion.
The cross-sectional area of the connecting portion in the opening / closing direction of the valve body is set within a range of 30% or more and 70% or less of the area of the plane surrounded by one of the valve body sheets .
The cross-sectional area of the connecting portion included in the region on the opening direction side from the reference plane passing through the center of the valve body sheet and orthogonal to the opening / closing direction is larger than the cross-sectional area of the connecting portion included in the region on the closing direction side from the reference plane. , Is set to be narrower,
When the valve box seat is deformed in the state where the valve body is deformed in the push-back direction when it is pushed back from the valve box seat in the closed position, the valve body follows the valve box seat and is deformed in the direction opposite to the push-back direction. If the amount when trying to return to the original shape is the deformable amount of the valve body,
A sluice valve characterized in that the deformable amount of the valve body in the region on the opening direction side from the reference plane is larger than the deformable amount of the valve body in the region on the closing direction side from the reference plane. The cross-sectional shape of the connection part in the opening / closing direction of the valve body is circular.
The sluice valve according to claim 1, wherein the center in the radial direction of the connecting portion is set on the closing direction side with respect to the center of the valve body seat. The cross-sectional shape of the connection part in the opening / closing direction of the valve body is circular.
The sluice valve according to claim 1 or 2, wherein the cross-sectional shape of the outer peripheral portion of the connecting portion is an arc shape recessed inward in the radial direction of the connecting portion. The cross-sectional shape of the connection part in the opening / closing direction of the valve body is circular.
Claim 1 is characterized in that the gap between one valve plate portion and the other valve plate portion is formed in a tapered shape that expands in the thickness direction of the valve body toward the radial outer side of the connection portion. Item 3. The sluice valve according to any one of items 3. The sluice valve according to any one of claims 1 to 4, wherein the valve box can be connected to a pipe via a seismic joint. The valve box has sockets on both ends
The socket has an opening on the end face and has a lock ring and a lock ring mounting groove inside.
The lock ring is fitted into the lock ring mounting groove and
5. A claim 5 is characterized in that a reinforcing member is provided on the outer surface of the valve box over the formed portion of the lock ring mounting groove of one receiving port and the forming portion of the lock ring mounting groove of the other receiving port. The sluice valve described in. The cross-sectional area of the connecting portion in the opening / closing direction of the valve body is 40% or more and 60% or less, or 45% or more and 55% or less of the area of the plane surrounded by one of the valve body sheets. The sluice valve according to any one of claims 1 to 6, wherein the sluice valve is set to. A valve rod insertion hole is formed in the valve body,
The valve stem insertion hole penetrates the connection and
The cross-sectional area of the connecting portion in the opening / closing direction of the valve body including the valve rod insertion hole is set within a range of 50% or more and 95% or less of the area of the plane surrounded by one of the valve body sheets. The sluice valve according to any one of claims 1 to 7, wherein the sluice valve is characterized in that.

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