JP2014111971A - Gate valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress cutting of a sealing member in a gate valve.SOLUTION: A reinforcement member 105 for suppressing deformation of a sealing member 104b is vulcanized and bonded to a part closer in Z2 direction than a first guide part 101d, closer to Z1 direction than a second guide part 101e, and closer to Y1 direction than an end A1 on the Z1 direction side and an end A2 on the Z2 direction side of a bottom surface adhesion part A of the sealing member 104b attached to a valve element 104 of a gate valve 100.

Description

  The present invention relates to a gate valve that is connected to a pipe through which a fluid flows, and that blocks the fluid flow path.

  FIG. 1 shows an example of a conventionally known soft seal gate valve (hereinafter referred to as “gate valve”). As shown in FIG. 1, the gate valve 10 includes a valve box 11 connected to a pipe (not shown), a valve rod 13 having a thread formed on the outer peripheral surface, and a female screw piece screwed into the valve rod 13. 14 and a valve body 12 capable of moving back and forth in a direction parallel to the rotation axis of the valve stem 13. The valve body 12 includes a cored bar 12a that forms the main body of the valved body 12, a seal member 12b that is attached to the periphery of the cored bar 12a and made of an elastic material, and a pressing plate 12c that presses the seal member 12b against the cored bar 12a. Have. The female screw piece 14 is installed in a hole (not shown) of the cored bar 12a.

  In the above configuration, when the valve stem 13 is rotated in one rotational direction, the female screw piece 14 and the valve body 12 both move in the Y1 direction of FIG. 1 and the seal member 12b is pressed against the bottom surface 11a of the valve box 11. . As a result, the space between the valve box 11 and the cored bar 12a is sealed (sealed) by the seal member 12b, and the flow path inside the valve box 11 is blocked (referred to as "closed state"). On the other hand, when the valve stem 13 is rotated in the other rotation direction, the female screw piece 14 and the valve body 12 both move in the Y2 direction in FIG. 1, thereby separating the seal member 12b from the bottom surface 11a of the valve box 11. The flow path is opened (referred to as “open state”), and the fluid flows in the X1 direction.

Japanese Patent No. 4515906 Japanese Patent Publication No. 01-35229 Japanese Utility Model Publication No. 53-23930

  In the gate valve 10, when the valve body 12 is moved in the Y1 direction in order to shift from the open state to the closed state, the interval between the valve body 12 and the bottom surface 11a is gradually narrowed (the opening degree of the valve is gradually decreased). ), The dynamic pressure of the fluid flowing between the valve body 12 and the bottom surface 11a increases as the opening degree decreases. When a fluid having a high dynamic pressure flows between the valve body 12 and the bottom surface 11a, the dynamic pressure acts on the seal member 12b, and the T direction (an oblique direction between the X1 direction and the Y1 direction) shown in FIG. ), The seal member 12b may be stretched and dragged out. FIG. 2 is an enlarged view of a portion surrounded by a broken line in FIG. 1, and is an explanatory view showing a state in which the seal member 12 b is pulled out from the valve body 12. In FIG. 2, a chain line portion indicated by reference numeral 12 b ′ indicates a dragged portion of the seal member.

  When the seal member 12b is dragged out as shown in FIG. 2, when the gate valve 10 is completely closed, the seal member 12b is cut by the core metal 12a (or the pressing plate 12c) and the bottom surface 11a. Problem arises. Specifically, the sealing member 12b attached to the upstream side (X2 direction side) of the flow path in the valve body 12 is sandwiched between the metal core 12a and the bottom surface 11a and is cut, and the flow in the valve body 12 is The seal member 12b attached to the downstream side (X1 direction side) of the path has a problem of being sandwiched between the pressing plate 12c and the bottom surface 11a and being cut.

  This invention is made | formed in view of the above problem, and it aims at suppressing that a sealing member will be cut | disconnected in a gate valve.

  In order to achieve the above object, according to the present invention, the flow path is formed in the valve box, and the flow is moved in the traveling direction toward the bottom surface of the flow path inside the valve box. A valve body for shifting the path from an open state to a closed state; and a wall portion inside the valve box that is formed to extend in the traveling direction and is fitted with the valve body to advance the valve body In a gate valve provided with first and second guide portions for guiding in a direction, a direction perpendicular to the traveling direction and crossing the flow path is defined as a first direction, and a direction opposite to the first direction is defined as a second direction. Then, the first guide portion is formed on the first direction side of the wall portion of the valve box, the second guide portion is formed on the second direction side of the wall portion of the valve box, and the valve The body includes a main body portion and an elastic member that seals between the main body portion and the valve box in the closed state, and the elastic portion Has a bottom surface contact portion which is separated from the bottom surface portion in the open state and is in close contact with the bottom surface portion in the closed state and is convex toward the traveling direction, and among the elastic members, The portion closer to the second direction than the first guide portion, the portion closer to the first direction than the second guide portion, and the first direction side of the bottom surface contact portion A reinforcing member that suppresses deformation of the elastic member is bonded to an end portion and a portion closer to the traveling direction than the end portion on the second direction side.

  Usually, in the gate valve, when the opening degree (the opening degree of the valve) is lowered in order to shift from the open state to the closed state, both guide parts (first and second guide parts) are provided around the valve body. In the direction of travel (hereinafter referred to as “lower side”), the degree of decrease in the flow resistance is more remarkable than in the vicinity of the head and the direction opposite to the travel direction (hereinafter referred to as “upper side”). Here, the lower the flow resistance, the lower the static pressure and the higher the flow rate and flow rate and the higher the dynamic pressure.

  Therefore, when the opening of the gate valve is lowered, the dynamic pressure received by the valve body as a whole increases, but the degree of increase in dynamic pressure is not so high in the vicinity of both guide parts and in the upper part, and in the lower part. As a result, the degree of increase in dynamic pressure is significantly increased.

  That is, according to the gate valve configuration of the present invention, a reinforcing member that suppresses deformation of the elastic member is bonded to a portion of the elastic member where the degree of increase in dynamic pressure is high when the opening of the valve is lowered. Will be. Therefore, even if the elastic member receives a high dynamic pressure, the elastic member can be prevented from being stretched and dragged out, so that the problem that the elastic member is cut can be suppressed. .

  Further, the gate valve of the present invention is a case where a cross section obtained by cutting the elastic member on a plane perpendicular to the axis of the flow path is virtually set, and in the cross section, (a) Virtually setting a midpoint of a line segment having both ends of the first direction side and the second direction side as ends, (b) parallel to the traveling direction and starting from the midpoint And (c) a second straight line obtained by rotating the first straight line by 45 degrees in one rotational direction with the midpoint as a rotation center, and a second straight direction extending in the other rotational direction. When the third straight line obtained by rotating the first straight line by 45 degrees is set virtually, in the cross section, at least a part of the reinforcing member is located between the second straight line and the third straight line. An adhesion position of the reinforcing member with respect to the seal member may be determined.

  In the gate valve of the present invention, when the opening degree of the valve is lowered, the portion between the second straight line and the third straight line in the cross section has the highest increase in dynamic pressure. That is, according to the gate valve of the present invention, the elastic member is stretched by the dynamic pressure because at least a part of the reinforcing member is bonded in a range where the degree of increase in the dynamic pressure becomes the highest when the opening of the valve is lowered. Therefore, it is possible to effectively suppress the situation of being dragged out.

  Further, in the present invention, the reinforcing member is formed with a protruding portion that protrudes toward the main body portion, and the main body portion is located closer to the traveling direction than the protruding portion. In addition, a hooking portion that protrudes toward the elastic member and hooks the protruding portion may be formed.

  Thereby, even if a high dynamic pressure acts on the reinforcing member and the reinforcing member is pulled, the protruding portion of the reinforcing member is hooked on the hooking portion, so that the reinforcing member can be further prevented from being dragged out.

  In the present invention, the valve body may include a pressing plate that presses the elastic member against the main body, and the pressing plate may be bonded to the elastic member as the reinforcing member.

  Even with such a configuration, when the elastic member receives a high dynamic pressure, it is possible to suppress a situation in which the elastic member is stretched and dragged out, so that the elastic member is cut. There exists an effect that generation | occurrence | production can be suppressed.

  According to the gate valve of this invention, there exists an effect that generation | occurrence | production of the problem that an elastic member will be cut | disconnected can be suppressed.

It is the figure which showed the conventional gate valve, Comprising: It is the figure which showed typically the cross section at the time of cutting a gate valve by the plane parallel to the axis | shaft of the flow path of a gate valve, and the axis | shaft of a valve rod. It is the figure which expanded and showed the broken-line part shown in FIG. 1, Comprising: It is explanatory drawing which shows a mode that the sealing member was dragged out from the valve body. (A) is a figure which shows the open state of the gate valve of 1st Embodiment, and is a cross section at the time of cutting a gate valve by the plane parallel to the axis | shaft of the flow path of a gate valve, and the axis | shaft of a valve stem. It is the figure shown in. (B) is a figure for demonstrating the positional relationship of the seal member in the gate valve of the state shown to (a), a reinforcement member, and the wall part of a valve box. It is a disassembled perspective view of the valve body shown in Fig.3 (a). It is the figure which showed a mode that the gate valve shown in Fig.3 (a) was in the closed state. It is a perspective view of the reinforcement member adhere | attached on the sealing member shown to Fig.3 (a). (A) is the front view which showed the sealing member attached to the X2 direction side among the valve bodies shown in FIG. (B) is the figure which showed the side which faces a metal core among the sealing members shown to (a). (C) is a bottom view of the seal member shown in (a). (D) is the figure which expanded and showed the location enclosed by the broken-line part shown in FIG. (A) It is the 1st schematic diagram for demonstrating the positional relationship of a sealing member and a reinforcement member, (b) is a 1st schematic diagram for demonstrating the positional relationship of a sealing member and a reinforcement member. is there. (A) is the figure which showed the valve body of the gate valve which concerns on the 1st modification which is a variation of 1st Embodiment, and is parallel to the axis | shaft of the flow path of a gate valve, and a plane parallel to the axis | shaft of a valve stem. It is the figure which showed typically the cross section at the time of cut | disconnecting a valve body. (B) is a front view of the sealing member attached to the X2 direction side of the valve body shown to (a). (C) is a bottom view of the seal member shown in (a). (D) is the figure which expanded and showed the inner side of the broken line shown to (a). (A) is the figure which showed the valve body of the gate valve which concerns on the 2nd modification which is a variation of 1st Embodiment, and is parallel to the axis | shaft of the flow path of a gate valve, and parallel to the axis | shaft of the valve stem. It is the figure which showed typically the cross section at the time of cut | disconnecting a valve body. (B) is a front view of the sealing member attached to the X2 direction side of the valve body shown to (a). (C) is a bottom view of the seal member shown in (a). (D) is the figure which expanded and showed the inner side of the broken line shown to (a). It is sectional drawing which showed a part of valve body which concerns on the 3rd modification which is a variation of 1st Embodiment. (A) is a figure which shows the valve body of the gate valve which concerns on 2nd Embodiment, and shows the cross section when a valve body is cut | disconnected by the plane parallel to the axis | shaft of the flow path of a gate valve, and parallel to the axis | shaft of a valve stem. It is the figure shown typically. (B) is the figure which expanded and showed the inner side of the broken line shown to (a). (C) is sectional drawing which showed a part of valve body which concerns on the 4th modification which is a variation of 2nd Embodiment. (D) is sectional drawing which showed a part of valve body which concerns on the 5th modification which is a variation of 2nd Embodiment. (E) is sectional drawing which showed a part of valve body which concerns on the 6th modification which is a variation of 2nd Embodiment. It is the bottom view which showed the bottom face contact | adherence part among the sealing members shown in FIG.3 (b). It is explanatory drawing which shows the compression direction of the sealing member attached to the valve body of a gate valve.

[First embodiment]
The gate valve (soft seal gate valve) according to the first embodiment of the present invention is connected to a pipe for flowing a fluid, and is for opening and closing the fluid flow path. Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

(Overall configuration of gate valve)
FIG. 3A is a view showing the gate valve 100 of the first embodiment, and is partitioned by a plane parallel to the axis of the flow path of the gate valve 100 (the axis of the pipe portion 101a) and parallel to the axis of the valve stem. It is the figure which showed typically the cross section at the time of cut | disconnecting the valve 100. FIG. FIG. 3B is an explanatory view showing the positional relationship among the seal member 104b, the reinforcing member 105, and the wall portion of the valve box 101 in the gate valve 100 in the state shown in FIG. FIG. 4 is an exploded perspective view of the valve body shown in FIG. FIG. 5 is a view showing the gate valve 100 shown in FIG. 3A and showing a closed state in which the flow path is closed.

  In the drawings of the present application, the X1 direction indicates a direction in which the fluid flows in parallel with the flow path axis, and the X2 direction indicates a direction opposite to the X1 direction. The Y1 direction is one direction perpendicular to the X1 direction, and the direction of movement of the valve body when shifting from the open state in which the flow path of the gate valve is open to the closed state in which the flow path of the gate valve is closed ( Direction of travel). The Y2 direction is the reverse direction of the Y1 direction, and indicates the moving direction (retraction direction) of the valve body when shifting from the closed state to the open state. Further, the Z1 direction is one direction perpendicular to the X1 direction and perpendicular to the Y1 direction, and refers to a direction from right to left as viewed from an observer who has the X1 direction as the line-of-sight direction and the Y2 direction as the upward direction. The Z2 direction refers to the opposite direction of the Z1 direction.

  In FIG. 3 (a), the reference sign Z1 indicates the direction perpendicular to the paper surface and the direction from the near side of the paper surface toward the far side of the paper surface, and the reference sign Z2 indicates The direction perpendicular to the plane of the paper and pointing from the far side of the plane of the paper toward the near side of the plane of the paper. That is, in FIG. 3 (a), the direction perpendicular to the paper surface and from the front side of the paper surface toward the back side of the paper surface is the Z1 direction, and the direction perpendicular to the paper surface and from the back side of the paper surface to the paper surface. The direction toward the front side is the Z2 direction. The interpretation of the above symbols is the same in other drawings.

  As shown in FIG. 3A, the gate valve 100 of the present embodiment includes a valve box 101 connected to a pipe (not shown), a valve stem 102 having a thread formed on the outer peripheral surface, a valve A female thread piece 103 that is screwed into the thread of the rod 102 and a valve body 104 that can move forward and backward in a direction perpendicular to the direction of fluid flow in the valve box 101 are provided. In addition, the cross section of the valve body 104 shown to Fig.3 (a) shows typically the cross section cut | disconnected by the HH line | wire of FIG.

  As shown in FIG. 3 (a), the valve box 101 has a cylindrical portion that forms a flow path through which a fluid flows, an opening 101f that is formed in the tubular portion 101a, and a valve body. And an accommodating portion 101 c for accommodating 104. The accommodating part 101c and the pipe part 101a are connected via an opening 101f, and the inside of the accommodating part 101c and the inside (flow path) of the pipe part 101a communicate with each other. Further, the end portion on the X1 direction side of the tube portion 101a and the end portion in the X2 direction of the tube portion 101a are connected to a pipe (not shown).

  Further, as shown in FIGS. 3A and 3B, the wall portion of the valve box 101 is a portion that is formed on the Y1 direction side and desires the valve body 104 on the Y2 direction side. The bottom surface portion 101b has a shape that is recessed toward the Y1 direction. Specifically, in the bottom surface portion 101b, the alternate long and short dash line connecting the symbols T1 and T2 in FIG. 3B corresponds to the bottom surface portion 101b. In FIG. 3B, the alternate long and short dash line is a line indicating the contour of the wall portion of the valve box 101, and the alternate long and short dash line particularly indicates the contour of the bottom surface portion 101b.

  As shown in FIGS. 3A and 4, the valve body 104 includes a cored bar (valve body main body) 104 a that forms the main body of the valve body 104, and a seal member ( Elastic member) 104b and a pressing plate 104c pressing the sealing member 104b against the cored bar 104a.

  The female screw piece 103 is installed in a hole (not shown) of the cored bar 104a. The valve stem 102 is formed with a thread (male thread portion) for screwing the female thread piece 103 on the Y1 direction side, and a cap (not shown) is attached to an end portion on the Y2 direction side.

  In the gate valve 100 of the present embodiment, the valve box 101 and the cored bar 104a are made of a casting. The sealing member 104b is made of rubber (elastic material), but is not particularly limited to rubber as long as it has a sealing function by elastic force, and may be, for example, a fluororesin. The presser plate 104c, the female screw piece 103, and the valve stem 102 are made of metal such as stainless steel, but are not particularly limited to stainless steel.

  As shown in FIG. 3B, a first guide part 101 d and a second guide part 101 e are formed on the wall part inside the valve box 101. The first guide portion 101d and the second guide portion 101e are convex rails formed to extend in the Y1 direction and the Y2 direction in order to guide the valve body 104 in the Y1 direction and the Y2 direction.

  The first guide portion 101d is formed on the wall portion on the Z1 direction (first direction) side of the inner wall portion of the valve box 101. The 2nd guide part 101e is formed in the wall part by the side of Z2 direction (2nd direction) among the wall parts inside the valve box 101. As shown in FIG. 101 d of 1st guide parts and the 2nd guide part 101e comprise a part of valve box 101, and consist of castings. The Z1 direction and the Z2 direction are perpendicular to the Y1 direction and correspond to the direction crossing the flow path of the valve box 101.

  Also, as shown in FIG. 4, a concave guide receiving portion 104f that fits with the second guide portion 101e (convex rail) is formed on the Z2 direction side of the core metal 104a, and Z1 of the core metal 104a. On the direction side, a concave guide receiving portion 104f (not shown) that fits with the first guide portion 101d (convex rail) is formed.

  The valve body 104 is configured such that the Z1 direction side guide receiving portion 104f and the first guide portion 101d are fitted, and the Z2 direction side guide receiving portion 104f and the second guide portion 101e are fitted. Mounted on the box 101. Thus, when an external force in the Y1 direction or the Y2 direction is applied to the valve body 104, the valve body 104 is guided (guided) in the Y1 direction or the Y2 direction.

  The first guide portion 101d and the second guide portion 101e may be concave rails, and the guide receiving portion 104f may be convex.

  In the gate valve 100 described above, as shown in FIG. 3A, the state where the seal member 104b of the valve body 104 is separated from the bottom surface portion 101b and the flow path is opened corresponds to the open state. . In the open state, fluid flows in the X1 direction in the flow path. On the other hand, as shown in FIG. 5, the sealing member 104b of the valve body 104 is in close contact with the bottom surface portion 101b, and the space between the inner surface of the valve box 101 and the cored bar 104a is sealed (sealed) by the sealing member 104b. The state in which the flow path is blocked by the cored bar 104a and the seal member 104b corresponds to the closed state.

  When the operator rotates the valve stem 102 in one direction in the open state, an external force in the Y1 direction is applied to the female thread piece 103 and the valve body 104, and the valve body 104 is moved in the Y1 direction by the action of the external force. Move to. Thereby, the gate valve 100 can be shifted from the open state to the closed state.

  On the other hand, when the operator rotates the valve stem 102 in the other direction in the closed state, an external force in the Y2 direction is applied to the female screw piece 103 and the valve body 104, and the valve body 104 is caused by the action of the external force. Move in the Y2 direction. Thereby, the gate valve 100 can be shifted from the closed state to the open state.

(About fluid dynamic pressure)
In the gate valve 100, when the opening degree (valve opening degree) is lowered by moving the valve body 104 in the Y1 direction in order to shift from the open state to the closed state, Among them, the flow resistance is significantly reduced on the Y1 direction side (the bottom surface portion 101b side and the lower side) than on the vicinity of both guide portions 101d and 101e and on the Y2 direction side (the accommodating portion 101c side and the upper side). Here, the lower the flow resistance, the lower the static pressure, the higher the dynamic pressure, and the higher the flow velocity and flow rate (Because the sum of dynamic pressure and static pressure is constant according to Bernoulli's theorem, As the pressure decreases, the dynamic pressure (flow velocity) increases.

  Therefore, when the opening degree of the gate valve 100 is lowered, the dynamic pressure received by the valve body 104 increases as a whole, but the degree of increase of the dynamic pressure is not so much in the vicinity of both the guide portions 101d and 101e and the Y2 direction side. Although not high, the degree of increase in dynamic pressure is remarkably high on the Y1 direction side.

  In other words, in the vicinity of the opening 101f, which is the connection portion between the housing portion 101c and the tube portion 101a in FIG. 3A, the flow path becomes narrower by lowering the opening of the gate valve 100, but it is complicated. Since it is configured, the dynamic pressure is not increased as much as the vicinity of the bottom surface portion 101b. This also applies to the vicinity of both guide portions 101d and 101e shown in FIG. On the other hand, in the vicinity of the bottom surface portion 101b shown in FIGS. 3 (a) and 3 (b), when the flow path is narrowed by decreasing the opening of the gate valve 100, the flow velocity becomes remarkably high. The dynamic pressure is also significantly increased. That is, in the gate valve 100 of FIG. 3A, the dynamic pressure indicated by reference numeral 50 is not so high, but the dynamic pressure indicated by reference numeral 60 is extremely high.

(Reinforcing members)
As described above, in the gate valve 100, when the opening degree is low, the dynamic pressure on the Y1 direction side becomes extremely high, and in particular, the dynamic pressure in the gap between the valve body 104 and the bottom surface portion 101b becomes maximum. . Therefore, a high dynamic pressure acts on the Y1 direction side of the seal member 104b attached to the valve body 104.

  In this regard, when the seal member does not reinforce the dynamic pressure, as explained with reference to FIG. 2 (prior art), the portion of the seal member 12b where the high dynamic pressure acts is stretched and dragged out. End up. When the sealing member 12b attached to the X2 direction side of the valve body 12 is dragged out as described above, it is sandwiched between the metal core 12a and the bottom surface 11a and cut when it is closed. Problem arises. Further, when the seal member 12b attached to the X1 direction side of the valve body 12 is dragged out as described above, the seal member 12b is sandwiched between the pressing plate 12c and the bottom surface 11a and cut when the seal member 12b is closed. Problem arises.

  In contrast, in the gate valve 100 of the present embodiment, a reinforcing member 105 as shown in FIG. 6 is vulcanized and bonded to the seal member 104b. FIG. 6 is a perspective view showing the appearance of the reinforcing member 105 before being vulcanized and bonded to the seal member 104b. FIG. 7A is a front view showing the seal member 104b attached to the upstream side (X2 direction side) of the flow path in the valve body 104 and showing the side opposite to the side facing the cored bar 104a. FIG. 7B is a view showing the side of the seal member 104b shown in FIG. 7A facing the cored bar 104a. FIG. 7C is a bottom view of the seal member 104b shown in FIG. FIG. 7D is an enlarged view of a portion surrounded by a broken line portion shown in FIG.

  Hereinafter, the reinforcing member 105 will be described in detail. The reinforcing member 105 is a metal member that is vulcanized and bonded to the seal member 104b. When the reinforcing member 105 made of metal is bonded to the seal member 104b, the seal member 104b has high rigidity in the vicinity of the bonded portion, and deformation due to fluid dynamic pressure is suppressed.

  As shown in FIGS. 6 and 7, the reinforcing member 105 is located on the Y1 direction side and buried in the seal member 104b, and the reinforcing member 105 is located on the Y2 direction side and buried in the seal member 104b. The non-buried portion 105b is not formed. As will be described later, the non-buried portion 105b is covered with a thin film of rubber that is not buried in the seal member 104b.

  As shown in FIGS. 7A and 7B, the buried portion 105a has an edge on the Y1 direction side along the edge on the Y1 direction side of the seal member 104b, and the seal member It is molded according to the shape of the buried portion in 104b. The buried portion 105a is indicated by a broken line in FIGS. 3B, 7 and 8.

  The non-buried portion 105b is a portion protruding from the seal member 104b. As shown in FIG. 7D, the non-embedded portion 105b extends in the Y2 direction from the protruding portion a protruding toward the core metal 104a and the end portion of the protruding portion a on the core metal 104a side. And a standing portion b.

  The non-buried portion 105b is not buried in the seal member 104b, but is covered with a rubber thin film without exposing its metal surface. The reason why the thin film is covered in this way is that, in the process of vulcanizing and bonding the reinforcing member 105 to the seal member 104b, rubber flows between the mold and the reinforcing member 105, and this rubber adheres to the non-embedded portion 105b. Because.

(Reinforcing member mounting position)
Next, the position where the reinforcing member 105 is attached to the seal member 104b will be described in detail.

  As shown in FIG. 3B, a portion of the seal member 104b that is closer to the Z2 direction than the first guide portion 101d and closer to the Z1 direction than the second guide portion 101e. A reinforcing member 105 is attached. That is, in FIG. 3B, the reinforcing member 105 is positioned in a range on the Z2 direction side from the broken line indicated by reference numeral 101d and in a range on the Z1 direction side from the broken line indicated by reference numeral 101e. Yes.

  Further, in the present embodiment, a portion of the seal member 104b that is separated from the bottom surface portion 101b in the open state, is in close contact with the bottom surface portion 101b in the closed state, and is convex toward the Y1 direction. Let it be a bottom contact portion A (see FIG. 3B). As shown in FIG. 3B, the bottom surface contact portion A is a portion of the seal member 104b that faces the bottom surface portion 101b on the Y1 direction side so that it can be in close contact with the bottom surface portion 101b that is recessed in the Y1 direction. Furthermore, it is convex toward the Y1 direction.

  As shown in FIG. 3B or FIG. 8A, the most end portion on the Z1 direction side of the bottom surface contact portion A is defined as the end portion A1, and the most end portion on the Z2 direction side of the bottom surface contact portion A is shown. When the end portion is the end portion A2, the reinforcing member 105 is not bonded to the portion of the seal member 104b that is closer to the Y2 direction than the end portion A1 and the end portion A2, and the end portion A1 and the end portion A2 A reinforcing member 105 is bonded to a portion close to the Y1 direction.

  That is, in FIG. 8A, when the line segment D having the end A1 and the end A2 as both ends is virtually set, the seal member 104b is reinforced on the Y2 direction side of the line D. The member 105 is not bonded, and the reinforcing member 105 is bonded to the Y1 direction side of the line segment D. FIG. 8 is a schematic diagram for explaining the positional relationship between the seal member 104b and the reinforcing member 105, and a line indicated by a one-dot chain line is a virtually set line. 3 and 8, among the edges of the seal member 104b, the end A1, the end A2, and the both ends and the line facing the bottom surface portion 101b on the Y1 direction side correspond to the bottom surface contact portion A.

  The merit of determining the position of the reinforcing member 105 in this way is as follows. In the gate valve 100, when the opening degree is lowered, the degree of increase in the dynamic pressure on the Y1 direction side is extremely high, although the degree of increase in the dynamic pressure in the vicinity of both the guide portions 101d and 101e and the Y2 direction side does not become so high. In particular, the dynamic pressure in the gap between the valve body 104 and the bottom surface portion 101b is maximized. Therefore, a high dynamic pressure acts on the Y1 direction side of the seal member 104b except for the vicinity of both guide portions 101d and 101e. That is, according to the present embodiment, the reinforcing member for suppressing the deformation of the seal member 104b due to the dynamic pressure in the portion of the seal member 104b where the degree of increase in the dynamic pressure is high when the opening degree of the gate valve 100 is lowered. 105 is adhered. Therefore, even if the sealing member 104b receives a high dynamic pressure, it is possible to suppress a situation in which the sealing member 104b is stretched and dragged out, so that the sealing member 104b is cut into the core metal 104a and the holding plate 104c. The occurrence of problems can be suppressed.

  In the present embodiment, the attachment position of the reinforcing member 105 is determined based on the second straight line 85 and the third straight line 86 shown in FIG. Hereinafter, this point will be described with reference to FIG.

  First, a cross section (hereinafter referred to as a “virtual cross section”) in which the seal member 104b is cut in a plane perpendicular to the flow path axis of the valve box 101 is virtually set. Then, as shown in FIG. 8A, a midpoint Q0 of the line segment D is virtually set in the virtual cross section. Next, in the virtual cross section, a first straight line 84 (a straight line having no end point) that is parallel to the Y1 direction and extends in the Y1 direction starting from the middle point Q0 is virtually set. Further, as shown in FIG. 8 (a), a second straight line 85 obtained by rotating the first straight line 84 by 45 degrees in one rotational direction around the center point Q0 and a first straight line 84 in the other rotational direction. A third straight line 86 rotated 45 degrees is virtually set. Then, in the virtual cross section, the adhesion position of the reinforcing member 105 to the seal member 104b is determined so that at least a part of the reinforcing member 105 is located between the second straight line 85 and the third straight line 86. In other words, in the present embodiment, at least a part of the reinforcing member 105 is positioned in a portion of the seal member 104b closer to the center of the flow path than the second straight line 85 and the third straight line 86.

  Advantages in the case where the bonding position is thus determined will be described below. FIG. 13 is a bottom view of the bottom surface contact portion A, and is a view showing a portion on the center side of the flow path from the second straight line 85 and the third straight line 86 shown in FIG.

  As shown in FIG. 13, in the bottom surface contact portion A, the central portion of the flow path from the second straight line 85 and the third straight line 86 is on the upstream side (X2 direction side) or the downstream side (X1 direction side). Since it is convex toward the surface, it is more easily pulled when dynamic pressure acts. Therefore, in the present embodiment, as described with reference to FIG. 8A, at least a part of the reinforcing member 105 is between the second straight line 85 and the third straight line 86 (second straight line 85) in the virtual cross section. The bonding position of the reinforcing member 105 to the seal member 104b is determined so as to be positioned on the center side of the flow path from the third straight line 86. As a result, the situation in which the seal member 104b is extended and dragged out by the dynamic pressure can be effectively suppressed.

  Furthermore, in the present embodiment, at least a part of the reinforcing member 105 is located between the second straight line 85 and the third straight line 86 in FIG. The position of the reinforcing member 105 is determined based on the fourth straight line 87 and the fifth straight line 88. This point will be described below with reference to FIGS. 8A and 8B.

  First, in the virtual cross section set as described above, the fourth straight line 87 obtained by rotating the first straight line 84 by 80 ° in one rotation direction around the midpoint Q0 shown in FIG. A fifth straight line 88 obtained by rotating the first straight line 84 by 80 ° in the rotation direction is virtually set. The midpoint Q0 and the first straight line 84 shown in FIG. 8B are set in the same manner as shown in FIG. 8A.

  In the virtual cross section, the end portion on the Z1 direction side and the end portion on the Z2 direction side of the reinforcing member 105 protrude from the range between the second straight line 85 and the third straight line 86 shown in FIG. On the other hand, the reinforcing member 105 is positioned so as to fit between the fourth straight line 87 and the fifth straight line 88 shown in FIG. By positioning in this way, the reinforcing range in the seal member 104b can be widened, and the situation in which the seal member 104b is dragged out by dynamic pressure can be more effectively suppressed. .

In the present embodiment, the position of the reinforcing member 105 is determined so that all of the following conditions 1 to 3 are satisfied. However, even if the conditions 2 and 3 are not satisfied, only the condition 1 is satisfied. It is possible to suppress the situation where the seal member 104b is dragged out within the scope of the present invention. However, if not only the condition 1 but also the condition 2 is satisfied, the above situation can be effectively suppressed. Furthermore, if not only the conditions 1 and 2 but also the condition 3 is satisfied, the above-described situation can be more effectively achieved. The situation can be suppressed.
Condition 1: Of the seal member 104b, a portion closer to the Z2 direction than the first guide portion 101d, a portion closer to the Z1 direction than the second guide portion 101e, and the end A1 and The reinforcing member 105 is bonded to the portion closer to the Y2 direction than the end portion A2 (the reinforcing member 105 is not bonded to the end portion A1 and the portion closer to the Y2 direction than the end portion A2).
Condition 2: In the above-described virtual cross section, at least a part of the reinforcing member 105 is positioned between the second straight line 85 and the third straight line 86 in FIG.
Condition 3: In the virtual cross section described above, the end portion on the Z1 direction side and the end portion on the Z2 direction side of the reinforcing member 105 protrude from the range between the second straight line 85 and the third straight line 86 in FIG. On the other hand, it is located between the fourth straight line 87 and the fifth straight line 88 in FIG.

  In the above, for convenience, the positional relationship between the sealing member 104b and the reinforcing member 105 in the virtual cross section has been described using the schematic diagram of FIG. 8 that is not strictly a cross sectional view. It is obvious from FIG. 8 that the above conditions 2 and 3 are satisfied in the virtual cross section.

(Other feature points)
As shown in FIG. 7D, the non-embedded portion 105b of the reinforcing member 105 has a protruding portion a that protrudes toward the cored bar 104a. On the other hand, the cored bar 104a is formed with a hooking part B that protrudes toward the seal member 104b on the Y1 direction side of the protruding part a. Then, when the reinforcing member 105 is pulled in the Y1 direction or the T direction in FIG. 2, the protruding portion a is hooked on the hooking portion B. Thereby, even if the high dynamic pressure acts on the reinforcing member 105 and the reinforcing member 105 is pulled in the Y1 direction or the T direction in FIG. 2, the protruding portion a of the reinforcing member 105 becomes the hooking portion B of the metal core 104a. Since it is hooked, it can suppress further that the reinforcement member 105 is dragged out.

  Moreover, according to this embodiment, as shown in FIG.7 (d), in the part facing the metal core 104a among the sealing members 104b, the convex part b1 which protrudes in the direction of the metal core 104a is provided. Is formed. On the other hand, the cored bar 104a is formed with a concave part a1 into which the convex part b1 is fitted. According to such a configuration, there is an advantage that it is possible to further suppress dragging of the seal member 104b by fitting the convex portion b1 of the seal member 104b into the concave portion a1 of the core metal 104a.

  In the configuration of the present embodiment, the distance d (see FIG. 7D) between the pressing plate 104c and the reinforcing member 105 may be zero. That is, the surface of the reinforcing member 105 on the side of the pressing plate 104c may be exposed from the seal member 104b and may be in contact with the pressing plate 104c.

  Further, according to the configuration of the present embodiment, as shown in FIG. 7D, the thickness in the X1 direction in the portion on the Y1 direction side of the end portions A1 and A2 (see FIG. 8) in the seal member 104b. In the thickest part, the reinforcing member 105 is unevenly distributed on the side of the pressing plate 104c. Such a configuration has an advantage that the influence of the reinforcing member 105 on the compression rate of the seal member 104b can be suppressed. On the other hand, the configuration of FIG. 11 to be described later is included in one modification of the present invention because the attachment position of the reinforcing member 405 is restricted by the conditions 1 to 3, and the seal member 104b is dragged out. However, since the reinforcing member 405 is located near the center of the thickness direction (X1 direction) in the seal member 104b, the above advantage is not obtained (compression on the Y1 direction side from the reinforcing member 405). Rate goes up).

(Modification)
Next, a first modification that is a variation of the first embodiment will be described. In the following description, the same members as those described above are denoted by the same reference numerals, and the description thereof is omitted.

  Fig.9 (a) is a figure which shows the valve body 104 of the gate valve which concerns on a 1st modification. FIG.9 (b) is a front view of the sealing member 104b attached to the X2 direction side among the valve bodies 104 shown to Fig.9 (a). FIG. 9C is a bottom view of the seal member 104b shown in FIG. FIG. 9D is an enlarged view showing the inside of the broken line shown in FIG.

  The valve body 104 shown in FIG. 9 is different from the valve body 104 shown in FIG. 3 in that a reinforcing member 205 is vulcanized and bonded to the seal member 104b instead of the reinforcing member 105.

  Further, the attachment position of the reinforcing member 205 shown in FIG. 9 is subject to the same restrictions as the attachment position of the reinforcing member 105 shown in FIGS. That is, the attachment position of the reinforcing member 205 is determined at the same position as the attachment position of the reinforcing member 105 shown in the above-described conditions 1 to 3.

  As shown in FIGS. 9A and 9B, the reinforcing member 205 of this modification is a plate-like metal member, and is bent so as to conform to the shape of the bottom surface contact portion A of the seal member 104b. It is a thing. Further, as shown in FIGS. 9C and 9D, the reinforcing member 205 includes an embedded portion 205a embedded in the seal member 104b, and a core from the seal member 104b that is not embedded in the seal member 104b. And a protruding portion 205b protruding toward the gold 104a. The protruding portion 205b shown in FIG. 9 is covered with a rubber thin film without exposing its metal surface, like the non-buried portion 105b shown in FIG.

  Further, as shown in FIG. 9D, the cored bar 104a is formed with a concave groove C into which the protruding part 205b is fitted, and the wall part on the Y1 direction side of the groove C hooks the reinforcing member 205. It becomes the hook part C1. That is, when the reinforcing member 205 is pulled in the Y1 direction or the T direction in FIG. 2, the protruding portion 205b is hooked on the hook portion C1. Thereby, even if the high dynamic pressure acts on the seal member 104b and the reinforcing member 205 is pulled in the Y1 direction or the T direction in FIG. 2, the protruding portion 205b of the reinforcing member 205 is applied to the hooking portion C1 of the core metal 104a. Since it is hooked, it can suppress further that the reinforcement member 205 is dragged out.

  Although the reinforcing member 205 according to the first modification shown in FIG. 9 is obtained by bending a plate-like metal member, it is of course possible to change the shape of the reinforcing member 205 as appropriate. For example, as in the second modification shown in FIG. 10, a reinforcing member 305 formed by curving a columnar metal member may be attached to the seal member 104b.

  Fig.10 (a) is a figure which shows the valve body 104 of the gate valve which concerns on a 2nd modification. FIG.10 (b) is a front view of the sealing member 104b attached to the X2 direction side among the valve bodies 104 shown to Fig.10 (a). FIG. 10C is a bottom view of the seal member 104b shown in FIG. FIG.10 (d) is the figure which expanded and showed the inner side of the broken line shown to Fig.10 (a).

  Further, the mounting position of the reinforcing member 305 shown in FIG. 10 is subject to the same restrictions as the mounting position of the reinforcing member 105 shown in FIGS. That is, the attachment position of the reinforcing member 305 is determined at the same position as the attachment position of the reinforcing member 105 shown in the above-described conditions 1 to 3.

  Further, the reinforcing member 305 has a buried portion 305a buried in the seal member 104b, and a protruding portion 305b that is not buried in the seal member 104b and protrudes from the seal member 104b toward the core metal 104a. Yes. The protruding portion 305b shown in FIG. 10 is covered with a rubber thin film without exposing its metal surface, like the non-buried portion 105b shown in FIG. 7 and the protruding portion 205b shown in FIG.

  Further, the cored bar 104a shown in FIG. 10 (d) is formed with a concave groove E into which the protruding part 305b is fitted, and the wall part on the Y1 direction side of the groove E is a hooking part for hooking the reinforcing member 305. E1. When the reinforcing member 305 is pulled in the Y1 direction or the T direction in FIG. 2, it is possible to prevent the protruding portion 305b from being hooked by the hooking portion E1 and the reinforcing member 305 from being dragged out.

  In addition, all of the reinforcing members 105, 205, and 305 described above partially have non-buried portions that are not buried in the seal member 104b. For example, the third modified example of FIG. Like the valve body 104, the reinforcing member 405 may be entirely embedded in the seal member 104b.

  The valve body 104 shown in FIG. 11 is different from the valve body 104 shown in FIG. 9 in that a reinforcing member 405 is vulcanized and bonded to the seal member 104b instead of the reinforcing member 205. Other points are shown in FIG. This is the same as the valve body 104 shown. Further, the mounting position of the reinforcing member 405 shown in FIG. 11 is also subject to the same mounting position restrictions as the reinforcing member 205 shown in FIG.

(Differences from the prior art)
By the way, patent document 2 (Japanese Patent Publication No. 01-35229 gazette) has shown the point by which the support member which goes around the inner periphery of a pipe part is embed | buried under the valve seat member by the side of a pipe part in a butterfly valve. Below, the difference of the structure of this embodiment and patent document 2 is demonstrated.

(Difference 1)
In the butterfly valve as shown in Patent Document 2, since the range in which the dynamic pressure is high over the entire inner circumference of the pipe part at a very small opening, the inner part of the pipe part is similar to the technique of Patent Document 2. It is necessary to embed the support member so as to go around the circumference. On the other hand, since the present embodiment is the gate valve 100, as described above, the range in which the degree of increase in dynamic pressure is high is limited to the lower side (Y1 direction side), so the lower side of the seal member 104b. The reinforcing member 105 is necessary only in this range.

  Further, if the technical idea of Patent Document 2 is applied to a gate valve, the reinforcing member is bonded to the upper side (Y2 direction side) of the valve body in the sealing member. The restraint between the seal member on the upper side of the valve body and the valve box becomes large, and therefore, the adhesion between the seal member on the lower side of the valve body and the bottom surface portion of the valve box is reduced, and the water stoppage is deteriorated. The problem that occurs. On the other hand, according to the configuration of the present embodiment, as shown in FIG. 8A, the portion of the seal member 104b that is closer to the Y1 direction than the end A1 and the end A2 of the bottom surface contact portion A. Although the reinforcing member 105 is bonded to the end portion A1 and the portion closer to the Y2 direction than the end portion A2, the reinforcing member 105 is not bonded to the sealing member 104b without deteriorating the water stoppage. There is an effect that it is possible to suppress the occurrence of a problem such as cutting.

(Difference 2)
In the butterfly valve of Patent Document 2, since the cross-sectional shapes of the annular valve seat member (rubber) and the support member (reinforcing member) are the same over the entire circumference, the compression direction of the valve seat member (rubber) is on the entire circumference. It is constant across.

In contrast, gate valve, as shown in FIG. 14 is different compression direction of the rubber in the seal member 504b ₂ of the seal member 504b ₁ and Y1 direction side of the Y2 direction side (upper side) (lower side) . In the configuration of FIG. 14, similarly to the butterfly valve, when a reinforcing member is temporarily attached so as to extend over the entire circumference of the sealing member 504 _b (the sealing member 504 _{b 1} and the sealing member 504 _{b 2} having different compression directions). If fitted if the reinforcing member in each), also joined manufacturing errors of the reinforcing member not only fabrication errors of the core metal, the variation in the compressibility of the sealing member 504b ₁ and the sealing member 504b ₂ of the compression ratio becomes larger This causes a problem that the water stoppage is lowered. In this respect, in the gate valve 100 of the present embodiment, as shown in FIG. 3, the reinforcing member 105 is not attached to the Y2 direction side of the end portions A1 and A2 of the seal member 104b, and is more than the end portions A1 and A2. Since the reinforcing member 105 is attached to the Y1 direction side, the above problem does not occur.

(Difference 3)
Gate valve, as shown in FIG. 14, different shapes and thickness in the sealing member 504b ₂ of Y2 direction side seal member 504b ₁ and Y1 direction side (upper side) (lower side), the total of provisionally sealing member 504b Even if it is going to manufacture the reinforcement member over the circumference, the shape becomes complicated and there is a problem of high cost (the valve seat member of the butterfly valve is a simple ring and the shape is not complicated).

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. In the following description, the same members as those described above are denoted by the same reference numerals, and the description thereof is omitted.

  Fig.12 (a) is sectional drawing which shows the valve body 12 of the gate valve which concerns on 2nd Embodiment. FIG.12 (b) is the figure which expanded and showed the inner side of the broken line shown to Fig.12 (a).

  In the valve body 12 of the second embodiment shown in FIGS. 12A and 12B, the reinforcing members 105, 205, and 305.405 shown in the first embodiment are not bonded to the seal member 104b. Instead, a part of the seal member 104b is vulcanized and bonded to the pressing plate 104c.

  Moreover, the adhesion position of the sealing member 104b and the pressing plate 104c in the valve body 104 in FIG. 12A is subject to the same restrictions as the attachment position of the reinforcing member 105 shown in FIGS. That is, the bonding position between the sealing member 104b and the pressing plate 104c in the valve body 104 in FIG. 12A is determined to be the same position as the mounting position of the reinforcing member 105 shown in the conditions 1 to 3 described above.

  In FIG. 12A and FIG. 12B, the adhesion point between the seal member 104b and the pressing plate 104c is a thick line indicated by the reference symbol F.

  According to the configuration shown in FIGS. 12A and 12B described above, a portion of the seal member 104b, which has a high degree of increase in dynamic pressure when the valve opening is lowered, is applied to the pressing plate 104c. It will be vulcanized. Therefore, even if the seal member 104b receives a high dynamic pressure, the pressing plate 104c functions as a reinforcing member that increases the rigidity of the seal member 104b, and the situation where the seal member 104b is extended and dragged out can be suppressed. There exists an effect that generation | occurrence | production of the problem that the sealing member 104b will be cut | disconnected can be suppressed.

  Further, according to the configuration shown in FIG. 12 (b), as in the configuration of FIG. 7 (d), the portion of the seal member 104b facing the cored bar 104a projects toward the cored bar 104a. Convex part b1 is formed. On the other hand, the cored bar 104a is formed with a concave part a1 into which the convex part b1 is fitted. Therefore, there is an advantage that it is possible to further suppress dragging of the seal member 104b by fitting the convex portion b1 of the seal member 104b into the concave portion a1 of the cored bar 104a.

  In addition, the convex part b1 and the recessed part a1 shown in FIG.12 (b) are not essential structures, For example, like the valve body 12 of the 4th modification shown by FIG.12 (c), convex part b1 and A configuration in which the recess a1 is not formed may be used. However, the valve body 12 in FIG. 12B suppresses the seal member 104b from being dragged out by the amount of the convex part b1 and the concave part a1 compared to the valve body 12 in FIG. High effect.

  Further, as in the valve body 104 of the fifth modification shown in FIG. 12D, a protruding portion G protruding toward the seal member 104b in the portion of the pressing plate 104c that is bonded to the seal member 104b. May be formed. According to such a configuration, there is an advantage that the action of pressing the seal member 104b against the cored bar 104a by the protrusion G is further strengthened, and the dragout of the seal member 104b can be further suppressed.

  In the fifth modification shown in FIG. 12D, the protrusion G is formed by bending the pressing plate 104c so that the edge of the pressing plate 104c protrudes toward the seal member 104b. For example, FIG. As in the sixth modification shown in (e), the protrusion G1 can also be formed by bending the pressing plate 104c so that the edge of the pressing plate 104c protrudes on the opposite side of the seal member 104b. . Similarly to the protrusion G of FIG. 12D, the protrusion G1 of the sixth modification shown in FIG. 12E also has a configuration protruding toward the seal member 104b, and the seal member 104b is directed to the cored bar 104a. It has a function to support the pressing action.

  In the second embodiment described above, in the step of vulcanizing and bonding the sealing member 104b to the pressing plate 104c, masking (rubber) on the side of the pressing plate 104c opposite to the side facing the sealing member 104b. To prevent adhesion). Therefore, according to the configuration of the second embodiment, the cost is higher than the configuration of the first embodiment.

  In the present embodiment, the bonding position between the seal member 104b and the pressing plate 104c in FIG. 12A is subject to the same restrictions as the attachment position of the reinforcing member 105 shown in FIGS. However, there is no particular limitation. That is, the seal member 104b is vulcanized and bonded not only to the end portions A1 and A2 (see FIG. 3B) but also to the holding plate 104c not only on the Y1 direction side but also on the Y2 direction side from the end portions A1 and A2. It may be. Further, the entire surface of the seal member 104b facing the pressing plate 104c may be vulcanized and bonded to the pressing plate 104c.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The gate valve of the present invention can be suitably used for water supply, sewerage, agricultural water supply, industrial water supply, and the like.

84 1st straight line 85 2nd straight line 86 3rd straight line 100 Gate valve 101 Valve box 101b Bottom face part 101d 1st guide part 101e 2nd guide part 104 Valve body 104a Core metal (main part)
104b Seal member (elastic member)
105 Reinforcing member 205 Reinforcing member 205b Protruding part 305 Reinforcing member 305b Protruding part 405 Reinforcing member A Bottom surface adhering part A1 End part A2 End part B Hanging part C1 Hanging part D Line segment E1 Hanging part Q0 Mid point a Protruding part

Claims (4)

A valve box in which a flow path is formed, a valve body that moves in a traveling direction toward the bottom surface of the flow path inside the valve box, and moves the flow path from an open state to a closed state; A first guide portion and a second guide portion, which are formed so as to extend in the advancing direction at a wall portion inside the valve box and which are fitted with the valve body and guide the valve body in the advancing direction. In the gate valve provided,
Assuming that one direction perpendicular to the traveling direction and crossing the flow path is a first direction and a direction opposite to the first direction is a second direction, the first guide portion is the first of the wall portions of the valve box. Formed on the direction side, the second guide part is formed on the second direction side of the wall of the valve box,
The valve body has a main body portion and an elastic member that seals between the main body portion and the valve box in the closed state,
The elastic member has a bottom surface contact portion that is separated from the bottom surface portion in the open state and is in close contact with the bottom surface portion in the closed state and is convex toward the traveling direction,
Of the elastic member, a portion closer to the second direction than the first guide portion, a portion closer to the first direction than the second guide portion, and a bottom contact portion of the elastic member A partition member, wherein a reinforcing member that suppresses deformation of the elastic member is bonded to an end portion on the first direction side and a portion closer to the traveling direction than an end portion on the second direction side. valve. When virtually setting a cross section of the elastic member in a plane perpendicular to the axis of the flow path;
In the cross section, (a) virtually setting a midpoint of a line segment having both ends of the bottom-contacting portion on the first direction side and the end on the second direction side, (b) A first straight line that is parallel to the advancing direction and extends in the advancing direction starting from the midpoint is set virtually, and (c) the first straight line is rotated 45 degrees in one rotation direction with the midpoint as the rotation center. When virtually setting the second straight line and the third straight line obtained by rotating the first straight line by 45 degrees in the other rotation direction,
The bonding position of the reinforcing member to the elastic member is determined so that at least a part of the reinforcing member is located between the second straight line and the third straight line in the cross section. The gate valve according to 1. The reinforcing member is formed with a protruding portion that protrudes toward the main body portion,
The hook portion for hooking the protruding portion is formed on the main body portion, which is positioned on the side of the moving direction from the protruding portion and protrudes toward the elastic member. The gate valve according to 1 or 2. The valve body has a pressing plate that presses the elastic member against the main body,
The gate valve according to claim 1 or 2, wherein the pressing plate is bonded to the elastic member as the reinforcing member.

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