JP7349350B2 - Valve box and gate valve - Google Patents

Description

The present invention relates to a valve box having a socket and a valve box seat, and a gate valve having such a valve box.

Conventionally, this type of gate valve has a valve body 111, a valve body 112 provided in the valve body 111, and a valve stem that moves the valve body 112 in opening and closing directions O and S, as shown in FIG. 11, for example. 113.

As shown in FIGS. 11 to 13, the valve box 111 includes a body 115 having end openings 114 at both ends, and a valve body housing chamber 116 that accommodates the valve body 112 that has moved in the opening direction O. ing. A valve body flow path 117 communicating with both end openings 114 is formed within the body portion 115 . The valve body housing chamber 116 is provided in the body portion 115 and has a valve body housing space 118 therein. The valve body housing space 118 communicates with the valve box flow path 117 via an internal opening 119 formed in the body 115 .

Inside the body portion 115 and in the middle of the valve box flow path 117, a pair of annular valve box seats 121 are provided facing each other in the flow path axis direction A of the valve box flow path 117. Internal opening 119 is located between the upper ends of both valve box seats 121.

Further, the body portion 115 has sockets 122 at both ends. A lock ring housing groove 123 is formed on the inner circumference of the socket 122 over the entire circumference. A lock ring 125 is housed in the lock ring housing groove 123 to prevent the tube 124 inserted into the socket 122 from coming off.

Valve body seats 126 are provided on both sides of the valve body 112, respectively. In the closed position Ps, the valve body seat 126 contacts the valve body seat 121 over the entire circumference, and the valve body flow path 117 is blocked by the valve body 112 .

Further, a reinforcing member 127 is provided on the outer surface of the body portion 115. The reinforcing member 127 is located on the outer side of the flow path axis 128 of the valve box flow path 117, and is formed at a position overlapping the flow path axis 128 in a side view, as shown in FIG.

The socket 129 of the pipe 124 is inserted into the socket 122 of the valve box 111, and the valve box 111 and the pipe 124 are joined. A protrusion 130 is provided on the outer periphery of the tip of the insertion port 129. As shown in FIG. 11, when a detachment force F acts on the pipe 124 due to an earthquake or the like, the protrusion 130 engages the lock ring 125 from the back side of the socket 122, causing the socket 129 to move away from the socket 122. You can prevent them from leaving.

According to this, when a detachment force F acts on the pipe 124 as shown in FIG. 11 and the protrusion 130 engages with the lock ring 125, an external force f1 in the tensile direction is applied to the valve body 111 as shown in FIG. and external force f2 in the bending direction act, and the valve box 111 tends to deform in the direction of these external forces f1 and f2. When the valve box 111 deforms, the valve box seat 121 also deforms, and as shown in FIG. There is a problem in that a gap is generated and the fluid in the valve box 111 leaks from the upstream side to the downstream side of the valve body 112, resulting in a decrease in the water stop function. In order to prevent such deterioration of the water stop function, a reinforcing member 127 is provided on the outer surface of the body 115 to reduce deformation of the valve box 111.
Note that the valve box 111 of the gate valve 110 as described above is described in, for example, Patent Document 1 below.

JP2019-60380

However, in the conventional type described above, when an external force f1 in the tensile direction and an external force f2 in the bending direction are applied to the valve box 111, water leakage occurs, unlike a soft seal gate valve in which the valve body is made of an elastic material such as rubber. It is known that this occurs easily. In other words, in a soft seal gate valve, the valve body follows the deformation of the valve body to some extent by elastically deforming, so it is possible to secure surface pressure between the valve body and the valve body, and prevent water leakage. be.
On the other hand, as shown in FIG. 11, in the metal seat gate valve 110 in which the valve body seat 126 and the valve body seat 121 are formed of metal, almost no elastic deformation of the valve body 112 can be expected. Leakage occurs due to severe deformation. As shown in FIG. 13, the lower part between both valve box seats 121 is closed by the bottom 115a of the body 115, but the upper part between both valve box seats 121 is opened through an internal opening 119 into a valve body housing space. 118, the rigidity is lower than that below between both valve box seats 121. Therefore, when an external force f1 in the tensile direction and an external force f2 in the bending direction are applied to the valve box 111, the upper end side of the valve box seat 121 (i.e., the valve body housing space 118 side) is moved to the lower end side (i.e., the bottom of the body 115). 115a side), and fluid leakage is more likely to occur mainly on the upper end side of the valve box seat 121 (that is, on the valve body housing space 118 side).

The present invention effectively prevents fluid in the valve body from leaking from the upstream side of the valve body to the downstream side when the valve body is placed in the closed position while the valve body is subjected to a separation force of the pipe. An object of the present invention is to provide a valve box and a gate valve that can improve water stop function.

In order to achieve the above object, the first invention is a valve box for a gate valve, comprising:
It has a body with end openings at both ends, and a valve body housing chamber that accommodates the valve body moved in the opening direction,
A valve box flow path communicating with the openings at both ends is formed in the body,
The valve body housing chamber is provided in the body and has a valve body housing space inside.
The valve body housing space communicates with the valve box flow path through an internal opening formed in the body,
An annular valve box seat is provided within the body and in the middle of the valve box flow path,
The body has a pair of left and right side walls, an arcuate bottom wall provided between the bottoms of both side walls, and has a socket at at least one end,
A lock ring accommodating groove is formed on the inner periphery of the socket to accommodate a lock ring to prevent the tube inserted into the socket from coming off;
A first reinforcing member is provided on the outer surface of the trunk,
The first reinforcing member is located on the outer side of the end of the valve body seat on the side of the valve body housing space , and is connected to the attachment point of the valve body seat and the lock ring along the flow path axis of the valve body flow path. It is formed across the formation location of the accommodation groove,
A second reinforcing member located closer to the closing direction of the valve body than the first reinforcing member is provided on the outer surface of the side wall of the body,
The outer surface of the body between the first reinforcing member and the second reinforcing member is formed into a straight line in a cross section perpendicular to the flow path axis of the valve box flow path,
The distance between the first reinforcing member and the second reinforcing member is set to be greater than or equal to the thickness of the root portion of the first reinforcing member and greater than or equal to the thickness of the root portion of the second reinforcing member.

According to this, when the detachment force of the pipe is applied to the valve box and an external force in the tensile direction and an external force in the bending direction are applied to the valve box, the end of the valve box seat on the valve body housing space side is easily deformed. However, since the first reinforcing member is located on the outside of the end of the valve body seat on the valve body housing space side, the deformation of the end of the valve body seat on the valve body housing space side is greatly reduced. can be reduced to

In addition, since the detachment force of the pipe is applied to the valve box through the lock ring accommodated in the lock ring accommodation groove, the first reinforcing member is attached to the mounting location of the valve box seat and the location where the lock ring accommodation groove is formed. By forming the valve body over a wide range, the strength of the valve body against detachment force is improved, and deformation of the valve body seat is further reduced.

As a result, when the valve body is placed in the closed position, there is no gap between the valve body seat and the valve body seat, effectively preventing fluid in the valve body from leaking from the upstream side of the valve body to the downstream side. This improves the water-stopping function.

In addition, when the separation force of the pipe is applied to the valve box and an external force in the tensile direction and bending direction is applied to the valve box, deformation of the valve box seat can be further reduced, and the water stop function is improved. Improve further.

Furthermore, since the outer surface of the body between the first reinforcing member and the second reinforcing member is formed linearly in a cross section perpendicular to the flow path axis of the valve box flow path, the outer surface is When casting the valve box, the body portion between the first reinforcing member and the second reinforcing member becomes The flow of the hot water becomes better, and the occurrence of poor hot water circulation can be prevented. Moreover, when painting the outer surface of the valve box, since the paint is sufficiently supplied between the first reinforcing member and the second reinforcing member, it is possible to eliminate unpainted parts.

Further, since the distance between the first reinforcing member and the second reinforcing member is set to be greater than or equal to the thickness of the root portion of the first reinforcing member and greater than the thickness of the root portion of the second reinforcing member, Compared to the case where the above-mentioned interval is set narrower than the thickness of the above-mentioned root part, when casting the valve box, the flow of molten metal in the body between the first reinforcing member and the second reinforcing member is better. This can prevent the occurrence of poor hot water circulation. Moreover, when painting the outer surface of the valve box, since the paint is sufficiently supplied between the first reinforcing member and the second reinforcing member, it is possible to eliminate unpainted parts.

The second invention is a valve box for a gate valve,
It has a body with end openings at both ends, and a valve body housing chamber that accommodates the valve body moved in the opening direction,
A valve box flow path communicating with the openings at both ends is formed in the body,
The valve body housing chamber is provided in the body and has a valve body housing space inside.
The valve body housing space communicates with the valve box flow path through an internal opening formed in the body,
An annular valve box seat is provided within the body and in the middle of the valve box flow path,
The body has a pair of left and right side walls, an arcuate bottom wall provided between the bottoms of both side walls, and has a socket at at least one end,
A lock ring accommodating groove is formed on the inner periphery of the socket to accommodate a lock ring to prevent the tube inserted into the socket from coming off;
A first reinforcing member is provided on the outer surface of the trunk,
The first reinforcing member is located on the outer side of the end of the valve body seat on the side of the valve body housing space, and is connected to the attachment point of the valve body seat and the lock ring along the flow path axis of the valve body flow path. It is formed across the formation location of the accommodation groove,
A second reinforcing member located closer to the closing direction of the valve body than the first reinforcing member is provided on the outer surface of the side wall of the body,
The height from the root to the tip of the second reinforcing member is lower than the height from the root to the tip of the first reinforcing member.
In the valve box according to the third aspect of the invention, the end of the valve box seat on the side of the valve body housing space is included within the thickness of the root portion of the first reinforcing member.

In the valve box according to the fourth aspect of the present invention, the first and second reinforcing members have a tapered shape in which the thickness of the tip portion is thinner than the thickness of the root portion.
According to this, when casting the valve box, the flow of the molten metal between the first reinforcing member and the second reinforcing member is improved, and occurrence of poor molten metal running can be prevented. Moreover, when painting the outer surface of the valve box, since the paint is sufficiently supplied between the first reinforcing member and the second reinforcing member, it is possible to eliminate unpainted parts.

In the valve box according to the fifth aspect of the present invention, the first and second reinforcing members are formed parallel to the flow path axis of the valve box flow path.
The sixth invention is a gate valve having the valve box according to any one of the first to fifth inventions,
It has a valve body provided in the valve box and a valve stem that moves the valve body in the opening and closing direction,
A valve body seat is provided on the valve body,
In the closed position, the valve body seat contacts the valve body seat, and the valve body flow path is blocked by the valve body.

As described above, according to the present invention, when the valve body is placed in the closed position, no gap is generated between the valve body seat and the valve box seat, and the fluid in the valve body flows from the upstream side to the downstream side of the valve body. Leakage can be effectively prevented and the water stop function is improved.

1 is a sectional view of a gate valve according to a first embodiment of the present invention. FIG. 2 is a side view of the valve box of the gate valve. It is a sectional view of the same valve box. FIG. 2 is a partially cutaway plan view of the valve box. 4 is a view taken along the line XX in FIG. 3. FIG. FIG. 2 is an enlarged sectional view of the first and second reinforcing members of the valve box. It is a partially cutaway front view of the valve box. It is a sectional view of the valve box in the 2nd embodiment of the present invention. It is a sectional view of the valve box in the 3rd embodiment of the present invention. It is a sectional view of the valve box in the 4th embodiment of the present invention. FIG. 2 is a cross-sectional view of a conventional gate valve. It is a partially notched side view of the gate valve in the same embodiment. It is a sectional view of the valve box of the gate valve.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)

In the first embodiment, as shown in FIG. 1, 1 is a pipe line buried underground, and a gate valve 4 is connected between one pipe 2 and the other pipe 3. The gate valve 4 includes a cast valve body 11, a valve body 12 provided in the valve body 11, a valve stem 13 that moves the valve body 12 in opening and closing directions O and S, and a lid body 14. ing. In FIG. 1, the gate valve 4 is installed with the axis 15 of the valve stem 13 in the vertical direction.

As shown in FIGS. 2 to 5, the valve box 11 includes a body portion 18 having end openings 16 and 17 at both ends, and a valve body storage chamber 19 that accommodates the valve body 12 that has moved in the opening direction O. have. The body portion 18 has cylindrical sockets 20 and 21 at both ends, and between the sockets 20 and 21, a pair of left and right side walls 22 and an arc-shaped socket provided between the bottoms of the side walls 22. It has a bottom wall portion 24 of.

A valve body channel 25 is formed in the body 18 and communicates with the openings 16 and 17 at both ends. Further, the valve body housing chamber 19 is a square cylindrical member that is integrally provided in the upper part of the body portion 18, and has a valve body housing space 27 therein.

A lower portion of the valve body housing space 27 communicates with the valve box flow path 25 via an internal opening 28 formed in the body 18 . A pair of annular valve box seats 30 and 31 are provided in the body 18 and in the middle of the valve box channel 25 so as to face each other in the channel axis direction A of the valve box channel 25. The internal opening 28 opens between the upper ends of both valve box seats 30 and 31.

As shown in FIG. 1, the lid 14 is attached to the upper end of the valve body housing chamber 19. As shown in FIG. Further, the valve rod 13 is rotatably held in a state in which it penetrates the lid body 14 and enters the valve body housing space 27 in the valve body housing chamber 19 . The valve stem 13 has a male thread 33 on its outer peripheral surface, and is screwed into a piece member 34 having a female thread inside the valve body 11.

The valve body 12 has a wedge shape in which the thickness becomes thinner toward the closing direction S (lower side) when viewed from the side. The valve body 12 is provided with a pair of annular valve body seats 35 and 36 that press against the valve body seats 30 and 31 in the closed position Ps. Further, the top member 34 is provided at the upper end of the valve body 12 and moves in the opening and closing directions O and S together with the valve body 12 as the valve stem 13 rotates.

As shown in FIGS. 1 and 3, end flanges 38 and 39 are provided at the tips of both sockets 20 and 21 of the valve box 11, respectively. Furthermore, lock ring housing grooves 40 and 41 are formed on the inner circumferences of the sockets 20 and 21, respectively, over the entire circumference. The lock ring housing grooves 40, 41 house lock rings 42, 43 for preventing the tubes 2, 3 from coming off, and lock ring holders 44, 45.
Next, the connection structure between one pipe 2 and the gate valve 4 will be explained below.

One of the tubes 2 has an insertion port 46 at its end, and a protrusion 48 is formed around the entire circumference of the tip of the insertion port 46. An insertion port 46 of one pipe 2 is inserted into one socket 20 of the gate valve 4.

Further, the outer periphery of one socket 46 and the inner periphery of one socket 20 are sealed over the entire circumference by one annular sealing member 50 made of an elastic material such as rubber. One of the sealing members 50 is pressed toward the inner side of one of the sockets 20 by one of the annular press rings 52 . Note that one push ring 52 and one end flange 38 are connected by a plurality of bolts 54 and nuts 55. The protrusion 48 of one of the sockets 46 is located further back of one of the sockets 20 than one of the lock rings 42 is.

Further, the connection structure between the other pipe 3 and the gate valve 4 is similar to the connection structure between the one pipe 2 and the gate valve 4 described above, and the other pipe 3 has an inlet 47 at the end, A protrusion 49 is formed on the outer periphery of the tip of the insertion port 47 over the entire circumference. The socket 46 of the other pipe 3 is inserted into the other socket 21 of the gate valve 4 .

The outer periphery of the other socket 47 and the inner periphery of the other socket 21 are sealed over the entire periphery by the other seal member 51 . The other sealing member 51 is pressed toward the back of the other socket 21 by the other press ring 53 . Note that the other push ring 53 and the other end flange 39 are connected by a plurality of bolts 54 and nuts 55. The protrusion 49 of the other socket 47 is located deeper in the other socket 21 than the other lock ring 43 is.
Next, the reinforcing structure of the valve box 11 will be explained below.
As shown in FIGS. 2 and 4 to 7, first and second reinforcing members 61 and 62 are provided on both outer surfaces of the body 18 of the valve box 11, respectively.

The first and second reinforcing members 61 and 62 are arranged along the flow path axis 26 of the valve box flow path 25 from the location where one lock ring accommodation groove 40 is formed to the attachment location of both valve box seats 30 and 31, respectively. The lock ring housing groove 41 is formed over the area where the other lock ring housing groove 41 is formed.

Further, as shown in FIG. 5, the first reinforcing member 61 is located on both outer sides of the end B of the valve box seats 30, 31 on the valve body housing space 27 side (that is, the upper end B of the valve box seats 30, 31). It is located in The upper ends B of the valve box seats 30 and 31 are included within the thickness T1 of the root portion of the first reinforcing member 61. Note that the thickness T1 of the root portion of the first reinforcing member 61 refers to an arc-shaped rounded portion (R The thickness includes the part).

Further, the second reinforcing member 62 is located closer to the closing direction S of the valve body 12 than the first reinforcing member 61 (that is, on the lower side) and on both the outer sides of the left and right ends C of the valve box seats 30 and 31. and is provided on the outer surface of both side wall portions 22 of the body portion 18.
As shown in FIG. 2, the first and second reinforcing members 61 and 62 are each formed parallel to the flow path axis 26 of the valve box flow path 25.

As shown in FIG. 5, the outer surface 18a of the body 18 between the upper and lower portions of the first reinforcing member 61 and the second reinforcing member 62 is formed in a cross section perpendicular to the channel axis 26 of the valve box channel 25. , formed in a straight line.

As shown in FIG. 6, the first reinforcing member 61 has a tapered shape in which the thickness T2 at the tip portion is thinner than the thickness T1 at the root portion. Similarly, the second reinforcing member 62 has a tapered shape in which the thickness T4 at the tip portion is thinner than the thickness T3 at the root portion. The thickness T1 of the root portion of the first reinforcing member 61 and the thickness T3 of the root portion of the second reinforcing member 62 are the same dimension, and the thickness T2 of the tip portion of the first reinforcing member 61 and the thickness T3 of the root portion of the second reinforcing member 61 are the same. This dimension is the same as the thickness T4 of the tip portion of the reinforcing member 62.
Incidentally, the thickness T3 of the root portion of the second reinforcing member 62 refers to an arc-shaped rounded portion (R The thickness includes the part). Further, the thickness T2 of the tip end portion of the first reinforcing member 61 refers to an arc-shaped rounded portion (R portion ). Furthermore, the thickness T4 of the tip end portion of the second reinforcing member 62 refers to an arcuate rounded portion (R portion ).

The vertical distance D between the first reinforcing member 61 and the second reinforcing member 62 is equal to or greater than the thickness T1 of the root portion of the first reinforcing member 61 and greater than or equal to the thickness T3 of the root portion of the second reinforcing member 62. is set to .
Further, the height H1 from the root portion to the tip portion of the first reinforcing member 61 and the height H2 from the root portion to the tip portion of the second reinforcing member 62 are set to be the same.
The operation of the above configuration will be explained below.

As shown in FIG. 1, when a detachment force F is applied to the pipes 2 and 3 due to an earthquake, etc., the protrusions 48 and 49 engage with the lock rings 42 and 43 from the back side of the sockets 20 and 21. It is possible to prevent the sockets 46 and 47 from coming off the sockets 20 and 21.

At this time, as shown in FIGS. 2 and 3, an external force f1 in a tensile direction and an external force f2 in a bending direction act on the valve body 11, so the valve body 11 tends to deform in the direction of these external forces f1 and f2. do. Here, the lower part between both the valve box seats 30 and 31 is closed by the bottom wall part 24 of the body part 18, but the upper part between both the valve box seats 30 and 31 is closed by the valve body through the internal opening 28. Since it is open to the accommodation space 27, the rigidity is lower than that of the lower part between the valve box seats 30 and 31. As a result, when an external force f1 in a tensile direction and an external force f2 in a bending direction are applied to the valve box 11, as shown in FIG. The upper end B) of the valve box seats 30, 31 is more easily deformed than the end E of the valve box seats 30, 31 on the bottom wall 24 side (that is, the lower end E of the valve box seats 30, 31).

On the other hand, the first reinforcing member 61 is located on both outer sides of the end B of the valve body seats 30, 31 on the valve body housing space 27 side (that is, the upper end B of the valve body seats 30, 31). Therefore, deformation of the end portion B of the valve body seats 30, 31 on the valve body housing space 27 side can be significantly reduced.

In addition, as shown in FIGS. 2 and 4, the first and second reinforcing members 61 and 62 are connected from the formation location of one lock ring housing groove 40 to the mounting location of both valve box seats 30 and 31, and then to the other. By forming the lock ring accommodation groove 41 over the formation location, the strength of the valve box 11 against the external force f1 in the tensile direction and the external force f2 in the bending direction is improved, and deformation of the valve box seats 30, 31 is further reduced. .

Thereby, as shown by the solid line in FIG. 1, when the valve body 12 is moved to the closed position Ps and the valve body flow path 25 is blocked by the valve body 12, one valve body seat 35 30, and the other valve body seat 36 is in pressure contact with the other valve body seat 31, and between the one valve body seat 35 and one valve body seat 30, and between the other valve body seat 36 and the other valve body seat 30. No gap is generated between the valve body seat 31 and the fluid in the valve body 11 to be effectively prevented from leaking from the upstream side to the downstream side of the valve body 12, and the water stop function is improved. .

Further, as shown in FIGS. 5 and 6, the outer surface 18a of the body 18 between the upper and lower portions of the first reinforcing member 61 and the second reinforcing member 62 is connected to the channel axis 25 of the valve box channel 25. It is formed into a straight line in a cross section perpendicular to . As a result, when casting the valve body 11, the first reinforcing member 61 and the second reinforcing member The flow of hot water in the body 18 between the member 62 is improved, and occurrence of poor hot water circulation can be prevented. Moreover, when painting the outer surface of the valve box 11, since the paint is sufficiently supplied between the first reinforcing member 61 and the second reinforcing member 62, it is possible to eliminate unpainted parts.

Further, the vertical distance D between the first reinforcing member 61 and the second reinforcing member 62 is equal to or greater than the thickness T1 of the root portion of the first reinforcing member 61 and the thickness of the root portion of the second reinforcing member 62. It is set to T3 or higher. As a result, when casting the valve body 11, the distance between the first reinforcing member 61 and the The flow of hot water in the body 18 between the second reinforcing member 62 and the second reinforcing member 62 is improved, and the occurrence of poor hot water circulation can be prevented. Moreover, when painting the outer surface of the valve box 11, since the paint is sufficiently supplied between the first reinforcing member 61 and the second reinforcing member 62, it is possible to eliminate unpainted parts.

Further, the first reinforcing member 61 has a tapered shape in which the thickness T2 at the tip portion is smaller than the thickness T1 at the root portion. It has a tapered shape smaller than the thickness T3. Thereby, when casting the valve box 11, the flow of the molten metal between the first reinforcing member 61 and the second reinforcing member 62 is improved, and the occurrence of poor running of the molten metal can be prevented. Moreover, when painting the outer surface of the valve box 11, since the paint is sufficiently supplied between the first reinforcing member 61 and the second reinforcing member 62, it is possible to eliminate unpainted parts.
(Second embodiment)
In the second embodiment, as shown in FIG. 8, the height H2 of the second reinforcing member 62 is set lower than the height H1 of the first reinforcing member 61.
(Third and fourth embodiments)
In the first embodiment, as illustrated in FIG. Although it is completely included within the thickness T1 of the root portion of the member 61, in the third embodiment, as shown in FIG. The outer peripheral side at the end B may not be included within the thickness T1.
Further, a portion of the end portion B of the valve box seats 30 and 31 may be arranged so as not to be included within the thickness T1 of the root portion of the first reinforcing member 61.
Alternatively, as a fourth embodiment, as shown in FIG. 10, the outer peripheral side of the end B of the valve box seats 30, 31 is included within the thickness T1 of the root portion of the first reinforcing member 61. , the inner peripheral side of the end portion B does not need to be included within the range of the thickness T1.
According to this, the strength of the valve box 11 is improved in the fourth embodiment shown in FIG. 10 compared to the third embodiment shown in FIG. The reduction effect is large.

In each of the above embodiments, as shown in FIG. 3, the body 18 of the valve box 11 has cylindrical sockets 20 and 21 at both ends, but only at one end. It may have a mouth 20 or a socket 21.

In each of the above embodiments, as shown in FIG. 6, the thickness T1 of the root portion of the first reinforcing member 61 and the thickness T3 of the root portion of the second reinforcing member 62 are set to the same dimension. Different dimensions may be used. Further, although the thickness T2 of the tip end portion of the first reinforcing member 61 and the thickness T4 of the tip end portion of the second reinforcing member 62 are the same size, they may be different sizes.

2, 3 Pipe 4 Gate valve 11 Valve box 12 Valve body 13 Valve stems 16, 17 End opening 18 Body 19 Valve body housing chambers 20, 21 Socket 22 Side wall 24 Bottom wall 25 Valve box flow path 26 Flow Road axis center 27 Valve body housing space 28 Internal openings 30, 31 Valve box seats 35, 36 Valve body seats 40, 41 Lock ring housing grooves 42, 43 Lock ring 61 First reinforcing member 62 Second reinforcing member 18a Outer surface B of the body between the upper and lower portions of the first reinforcing member and the second reinforcing member End portion D of the valve box seat on the side of the valve body housing space Vertical distance H1 between the first reinforcing member and the second reinforcing member Height of the first reinforcing member H2 Height of the second reinforcing member O Opening direction Ps Closed position S Closing direction T1 Thickness of the base portion of the first reinforcing member T2 Thickness of the tip portion of the first reinforcing member T3 Thickness of the root portion of the second reinforcing member T4 Thickness of the tip portion of the second reinforcing member

Claims (6)

A valve box for a gate valve,
It has a body with end openings at both ends, and a valve body housing chamber that accommodates the valve body moved in the opening direction,
A valve box flow path communicating with the openings at both ends is formed in the body,
The valve body housing chamber is provided in the body and has a valve body housing space inside.
The valve body housing space communicates with the valve box flow path through an internal opening formed in the body,
An annular valve box seat is provided within the body and in the middle of the valve box flow path,
The body has a pair of left and right side walls, an arcuate bottom wall provided between the bottoms of both side walls, and has a socket at at least one end,
A lock ring accommodating groove is formed on the inner periphery of the socket to accommodate a lock ring to prevent the tube inserted into the socket from coming off;
A first reinforcing member is provided on the outer surface of the trunk,
The first reinforcing member is located on the outer side of the end of the valve body seat on the side of the valve body housing space , and is connected to the attachment point of the valve body seat and the lock ring along the flow path axis of the valve body flow path. It is formed across the formation location of the accommodation groove,
A second reinforcing member located closer to the closing direction of the valve body than the first reinforcing member is provided on the outer surface of the side wall of the body,
The outer surface of the body between the first reinforcing member and the second reinforcing member is formed into a straight line in a cross section perpendicular to the flow path axis of the valve box flow path,
The distance between the first reinforcing member and the second reinforcing member is set to be greater than or equal to the thickness of the root portion of the first reinforcing member and greater than or equal to the thickness of the root portion of the second reinforcing member. A bento box. A valve box for a gate valve,
It has a body with end openings at both ends, and a valve body housing chamber that accommodates the valve body moved in the opening direction,
A valve box flow path communicating with the openings at both ends is formed in the body,
The valve body housing chamber is provided in the body and has a valve body housing space inside.
The valve body housing space communicates with the valve box flow path through an internal opening formed in the body,
An annular valve box seat is provided within the body and in the middle of the valve box flow path,
The body has a pair of left and right side walls, an arcuate bottom wall provided between the bottoms of both side walls, and has a socket at at least one end,
A lock ring accommodating groove is formed on the inner periphery of the socket to accommodate a lock ring to prevent the tube inserted into the socket from coming off;
A first reinforcing member is provided on the outer surface of the trunk,
The first reinforcing member is located on the outer side of the end of the valve body seat on the side of the valve body housing space, and is connected to the attachment point of the valve body seat and the lock ring along the flow path axis of the valve body flow path. It is formed across the formation location of the accommodation groove,
A second reinforcing member located closer to the closing direction of the valve body than the first reinforcing member is provided on the outer surface of the side wall of the body,
A valve box characterized in that the height from the root portion to the tip portion of the second reinforcing member is lower than the height from the root portion to the tip portion of the first reinforcing member. 3. The valve box according to claim 1, wherein the end of the valve box seat on the side of the valve body housing space is included within the thickness of the root portion of the first reinforcing member. The valve according to any one of claims 1 to 3, wherein the first and second reinforcing members have a tapered shape in which the thickness of the tip portion is thinner than the thickness of the root portion. box. The valve box according to any one of claims 1 to 4, wherein the first and second reinforcing members are formed parallel to the flow path axis of the valve box flow path. A gate valve having the valve box according to any one of claims 1 to 5 above,
It has a valve body provided in the valve box and a valve stem that moves the valve body in the opening and closing direction,
A valve body seat is provided on the valve body,
A gate valve characterized in that in a closed position, a valve body seat abuts a valve body seat and a valve body flow path is blocked by the valve body.

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