Valve device

Abstract

To provide a valve device capable of improving watertightness.SOLUTION: A valve device 1 includes a valve element 100 that can open and close a fluid flow path by moving up and down, a valve chamber 11 that forms a part of the flow path and into which the valve element 100 enters when closing the flow path, and a valve accommodating section 14 that is disposed above the valve chamber 11 and into which the valve element 100 retreats when opening the flow path. The valve element 100 includes a body 110, a first seal portion 120 that is provided at the bottom of the body 110 and capable of sealing between the body and the inner surface of the valve chamber 11, and a second seal portion 130 that is provided on the body 110 so as to extend upward from the first seal portion 120 toward the upstream side of the flow path and capable of sealing between the body and the inner surface of the valve accommodating section 14 that extends in the up-down direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a valve device technology for opening and closing a fluid flow path. [Background technology]

[0002] Conventionally, the technology of a valve device for opening and closing a fluid flow path is well known, as described in Patent Document 1, for example.

[0003] The valve device (automatic farmland water supply device) described in Patent Document 1 has a plate-shaped water stop valve that can open and close a water supply channel by moving up and down. The water stop valve has an elastic outer periphery that has a lower surface, an upstream contact surface, and a downstream contact surface. The water stop valve can close the water supply channel by contacting each surface of the elastic outer periphery with the inner surface of a valve chamber that constitutes part of the water supply channel.

[0004] Furthermore, the stop valve has flanges that protrude toward the upstream and downstream sides. The stop valve can seal a horizontal step formed in the valve chamber by bringing the flanges into contact with the step from above. This makes it possible to prevent water from flowing into the space formed above the water supply passage (the space housing the stop valve, drive mechanism, etc.).

[0005] However, the technology described in Patent Document 1 has a configuration in which a horizontal step is sealed with a flange, so there is room for improvement in that if dirt, mud, etc. accumulates on the horizontal step, there is a risk that sufficient water-stopping properties may not be obtained. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6754877 Summary of the Invention [Problem to be solved by the invention]

[0007] One aspect of the present disclosure has been made in consideration of the above-mentioned circumstances, and a problem to be solved by the present disclosure is to provide a valve device capable of improving water-stopping performance. [Means for solving the problem]

[0008] The problem to be solved by one embodiment of the present disclosure has been described above. Next, the means for solving this problem will be described.

[0009] A valve device according to one aspect of the present disclosure is a valve device comprising a valve body capable of opening and closing a fluid flow path by moving up and down, a valve chamber forming a part of the flow path and into which the valve body enters when closing the flow path, and a valve accommodating section disposed above the valve chamber and into which the valve body retreats when opening the flow path, wherein the valve body comprises a main body section, a first seal section provided at a lower part of the main body section and capable of sealing against an inner surface of the valve chamber, and a second seal section provided on the main body section extending upward from the first seal section toward the upstream side of the flow path and capable of sealing against an inner surface of the valve accommodating section extending in the up and down direction. By configuring in this way, it is possible to improve the water stopping property.

[0010] In addition, in one embodiment of the present disclosure, the main body portion has an axis along the vertical direction and is formed in an approximately cylindrical shape with a curved side surface, and the second seal portion is provided along the side surface of the main body portion. By configuring in this way, it is possible to improve the water stopping property.

[0011] Furthermore, a valve device according to one embodiment of the present disclosure further includes an axial member connected to the main body portion for moving the main body portion up and down, the axial member being connected at a position eccentric to the upstream side of the flow path relative to the axis of the main body portion. With this configuration, by offsetting the main body portion rearward, the pressing force of the second seal portion against the inner surface of the valve accommodating portion is reduced, making it possible to reduce sliding resistance.

[0012] Moreover, the valve device according to one aspect of the present disclosure further includes a pressing portion that presses the valve body toward the upstream side of the flow path when the valve body moves to a position where it blocks the flow path. By configuring in this manner, the water pressure caused by the fluid flowing through the flow path is maximized when the flow path is blocked, but by pressing the second seal portion against the inner surface of the valve accommodating portion, water leakage from the flow path upward (towards the valve accommodating portion) can be effectively prevented.

[0013] Moreover, the valve device according to one aspect of the present disclosure further includes an adjustment portion capable of adjusting the position of the valve body relative to the valve housing portion. By configuring it in this manner, the relative position of the valve body with respect to the valve accommodating portion can be adjusted to adjust the distance and contact between the second seal portion and the inner surface of the valve accommodating portion so as to appropriately prevent water leakage.

[0014] In addition, in one embodiment of the present disclosure, a lower end portion of the second seal portion is disposed inside a cutout portion formed in the first seal portion. With this configuration, it is possible to prevent the second seal portion from peeling off from the lower end portion due to sliding against the inner surfaces of the valve accommodating portion and the valve chamber.

[0015] In addition, in one embodiment of the present disclosure, a lower end portion of the second seal portion is arranged so as to be in close contact with the first seal portion. With this configuration, it is possible to close the flow passage without bonding the first seal portion and the second seal portion.

[0016] In addition, according to one embodiment of the present disclosure, a lower end portion of the second seal portion is bent in a direction away from the inner surface of the valve accommodating portion. With this configuration, it is possible to prevent the second seal portion from peeling off from the lower end portion due to sliding against the inner surfaces of the valve accommodating portion and the valve chamber. Effect of the Invention

[0017] According to one aspect of the present disclosure, water stopping properties can be improved. [Brief description of the drawings]

[0018] [Figure 1] 1 is a side cross-sectional view showing an overall configuration of a valve device according to an embodiment of the present invention. [Diagram 2] 1 is a front cross-sectional view showing an overall configuration of a valve device according to an embodiment of the present invention; [Diagram 3] AA cross-sectional view and its partially enlarged view. [Figure 4] 4 is an exploded side view showing a valve body and a partially enlarged view thereof; FIG. [Diagram 5] FIG. [Figure 6] 1A is an enlarged front view showing a winding portion, and FIG. 1B is an enlarged front view showing another example of the winding portion. [Figure 7] 1A is a schematic plan view of the valve device in a state where the valve body is retracted upward to open the flow path, and FIG. [Figure 8] (a) is a schematic plan view showing the valve device in a state where the valve disc has moved downward to close the flow path, and (b) is a schematic side cross-sectional view of the same. [Figure 9] 1A is a schematic cross-sectional side view showing a valve device according to a first modified example, and FIG. 1B is a schematic cross-sectional side view showing a valve device according to a second modified example. [Figure 10] 13A and 13B are schematic side sectional views showing a valve device according to a third modified example, and a partially enlarged view thereof. [Figure 11] 13A is a schematic plan view showing a state in which the valve body is retracted upward and the flow path is opened in a valve device according to a fourth modified example, and FIG. [Figure 12] 13A is a schematic plan view showing a state in which the valve body has moved downward to close the flow path in a valve device according to a fourth modified example, and FIG. [Figure 13] 13A is a schematic plan view showing a valve device according to a fifth modified example, and FIG. [Figure 14]13A is a schematic cross-sectional side view showing a valve device according to a sixth modified example, and FIG. 13B is a schematic cross-sectional side view showing a valve device according to a seventh modified example. [Figure 15] 13A is a schematic side view of a valve body of a valve device according to an eighth modified example, (b) is a schematic bottom view of the valve body of the valve device according to the eighth modified example, and (c) is a bottom perspective view of a first seal portion of the eighth modified example. [Figure 16] 13A is a rear view of the valve device according to the ninth modified example, and FIG. 13B is a side cross-sectional view of the valve device according to the ninth modified example. [Figure 17] 13A is a front view showing a valve device according to a ninth modified example, and FIG. 13B is a top perspective view showing a first seal portion and a second seal portion of the valve device according to the ninth modified example. [Figure 18] 10A is a rear view of the valve device according to the tenth modified example, and FIG. 10B is a side cross-sectional view of the valve device according to the tenth modified example. [Figure 19] 10A is a front view of a valve device according to a tenth modified example, and FIG. 10B is a top perspective view of a first seal portion and a second seal portion of the valve device according to a tenth modified example. [Figure 20] (a) A schematic side view of a first seal portion according to a first modified example. (b) A schematic side view of a first seal portion according to a second modified example. (c) A schematic side view of a first seal portion according to a third modified example. (d) A schematic side view of a first seal portion according to a fourth modified example. (e) A schematic side view of a first seal portion according to a fifth modified example. (f) A schematic side view of a first seal portion according to a sixth modified example. [Figure 21] 13A is a schematic side view showing how dust is caught between the first seal and the bottom, and FIG. 13B is a schematic side view showing the first seal according to the seventh modified example and how dust flows below it. [Figure 22] (a) A schematic side view of a first seal portion according to an eighth modified example, (b) A schematic side view of a first seal portion according to a ninth modified example, (c) A schematic side view of a first seal portion according to a tenth modified example, and (d) A schematic front view of a first seal portion according to the tenth modified example. [Figure 23] FIG. 2 is a schematic plan view showing a valve device having a mounting plate and an irrigation channel. [Figure 24]1A is a schematic side view of a valve device having a mounting plate, and FIG. 1B is a schematic front view of a valve device having a mounting plate. [Diagram 25] 1A is a schematic side view of a valve device having a mounting plate according to a first modified example, and FIG. 1B is a schematic front view of a valve device having a mounting plate according to a first modified example. [Figure 26] 13A is a schematic side view showing a valve device having a mounting plate according to a second modified example, and FIG. 13B is a schematic side view showing a valve device having a mounting plate according to a third modified example. [Figure 27] FIG. 13 is a schematic plan view showing a valve device having a mounting plate according to a fourth modified example, and an irrigation channel. [Figure 28] FIG. 13 is a schematic side view showing a valve device having a mounting plate according to a fourth modified example, and an irrigation channel. [Figure 29] FIG. 13 is a schematic front view showing a valve device equipped with a mounting plate according to a fourth modified example. [Diagram 30] FIG. [Diagram 31] FIG. [Diagram 32] FIG. 2 is a schematic cross-sectional view showing the internal structure of the electric actuator. [Diagram 33] FIG. 4 is a schematic cross-sectional view showing the internal structure of the actuator body as viewed from the front side. [Diagram 34] FIG. 4 is a schematic cross-sectional view showing the internal structure of the actuator body as viewed from the right side. [Diagram 35] FIG. [Diagram 36] FIG. 4 is a cross-sectional view showing a cover member included in the main body case. [Figure 37] FIG. 4 is a cross-sectional view showing a holding member included in the main body case. [Figure 38] 13 is a diagram showing the area surrounding the drop stopper when the cover member is in a closed state. FIG. [Figure 39] 13 is a diagram showing the area surrounding the drop stopper when the cover member is in an open state; FIG. [Diagram 40] FIG. 4 is a front view showing the electric actuator when the cover member is in an open state. [Diagram 41] FIG. 4 is a diagram showing a connecting portion between the cover member and the holding member. [Diagram 42] 11A to 11C are diagrams illustrating an operation when the cover member is changed from an open state to a closed state. [Diagram 43] FIG. 4 is a perspective view showing a peripheral portion of a groove portion of the holding member through which wiring passes. [Diagram 44] FIG. 4 is a diagram showing the periphery of a groove portion of the holding member through which wiring passes. [Diagram 45] FIG. 4 is a diagram showing the surrounding area of ​​a through hole through which wiring of the electric actuator passes. [Figure 46] 1A is a front view of a groove formed in a lower portion of a side wall, and FIG. [Figure 47] 4 is an enlarged cross-sectional view showing an upper portion of the valve housing portion and a lower portion of the side wall portion. FIG. [Figure 48] (a) is a plan view showing the bearing portion, and (b) is a front sectional view showing the bearing portion. [Figure 49] FIG. 4 is an enlarged cross-sectional view showing a state in which a side wall portion is attached to a valve housing portion. [Figure 50] FIG. 4 is a side view showing a state in which an electric actuator is attached to the valve device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] In the following description, the directions indicated by arrows U, D, F, B, L and R in the figures are defined as upward, downward, forward, backward, leftward and rightward, respectively.

[0020] Hereinafter, a valve device 1 according to one embodiment of the present invention will be described.

[0021] The valve device 1 shown in Figures 1 and 2 constitutes a part of a fluid flow path and opens and closes the flow path. In this embodiment, as an example, the valve device 1 is assumed to be used in a flow path (open channel) for supplying water from an irrigation channel to a rice field, but the present invention is not limited to this and can be applied to various flow paths. The valve device 1 mainly comprises a valve box 10, a valve body 100, a valve stem 20, a handle 30, and a pressing part 40. In Figure 2, the first seal part 120 is shown in cross section cut at the center between the front and rear to help understand the structure.

[0022] The valve box 10 forms a part of the flow path and houses each component of the valve device 1. The valve box 10 mainly includes a valve chamber 11, an upstream portion 12, a downstream portion 13, and a valve housing portion 14.

[0023] The valve chamber 11 is the portion into which the valve element 100 enters when closing the flow path (when the valve element 100 descends). The valve chamber 11, together with the upstream portion 12 and downstream portion 13, is formed in a cylindrical shape extending forward and backward. The valve chamber 11, the upstream portion 12, and the downstream portion 13 have roughly the same inner diameter. The valve chamber 11, the upstream portion 12, and the downstream portion 13 form part of the flow path of water that flows forward and backward. Although not shown in the figure, the upstream portion 12 and the downstream portion 13 may be connected to an appropriate member that forms the flow path. For example, the upstream portion 12 may be connected to a pipe of an irrigation channel.

[0024] In this embodiment, water flows from the front side to the rear side. The upstream section 12 is formed upstream of the valve chamber 11 in the direction of water flow. The downstream section 13 is formed downstream of the valve chamber 11 in the direction of water flow.

[0025] The valve accommodating portion 14 is a portion into which the valve element 100 retreats when the flow path is opened (when the valve element 100 rises). The valve accommodating portion 14 is formed so as to branch off from the valve chamber 11 which forms the water flow path. Specifically, the valve accommodating portion 14 is formed in a cylindrical shape extending upward from the valve chamber 11. The inner diameter of the valve accommodating portion 14 is formed so as to be approximately the same as the inner diameter of the valve chamber 11. The inner surface of the valve accommodating portion 14 is formed so as to extend along the up-down direction (vertical direction). The valve accommodating portion 14 is provided with a guide rail 14a.

[0026] The guide rail 14a shown in Figs. 1 and 3 is for preventing the rotation of the valve body 100. The guide rail 14a is formed in a longitudinal shape extending in the vertical direction. When viewed in the longitudinal direction (in a plan view), the guide rail 14a is formed in a substantially C-shape with an open front. The guide rail 14a is fixed to the inner surface of the valve accommodating portion 14 (in the present embodiment, the rear part of the inner surface). The guide rail 14a is provided so as to extend from the upper part (near the bearing portion 21) to the lower end of the valve accommodating portion 14.

[0027] The valve disc 100 is capable of opening and closing the water flow path (specifically, the valve chamber 11). The valve disc 100 is arranged so as to be movable up and down from the valve chamber 11 to the valve housing portion 14. The valve disc 100 can open the water flow path by ascending to retreat into the valve housing portion 14. The valve disc 100 can also close the water flow path by descending to enter the valve chamber 11. The detailed configuration of the valve disc 100 will be described later.

[0028] The valve rod 20 is for raising and lowering the valve body 100 up and down. The valve rod 20 is formed in a substantially cylindrical (rod-like) shape, and is arranged so as to extend up and down inside the valve housing portion 14. The valve rod 20 is arranged at the center (axis) of the valve housing portion 14. The valve rod 20 is rotatably supported by a bearing portion 21 provided at the upper portion of the valve housing portion 14. A male thread is formed at the lower portion of the valve rod 20 (particularly, the portion below the bearing portion 21). The lower portion of the valve rod 20 is connected to the valve body 100 (main body portion 110). The male thread of the valve rod 20 is screwed into a female thread formed on the valve body 100. This allows the valve body 100 to be raised and lowered up and down as the valve rod 20 rotates.

[0029] In this embodiment, as shown in Fig. 3, the valve rod 20 is connected to a position eccentric to the front side (upstream side of the flow path) of the axis C of the valve disc 100 (main body 110). Therefore, the valve disc 100 (main body 110) supported by the valve rod 20 is disposed in the valve housing portion 14 so as to be eccentric slightly rearward with respect to the valve housing portion 14 (see Fig. 2). For convenience of explanation, Fig. 3 shows an example in which the valve rod 20 is significantly eccentric forward from the axis C, but the amount of eccentricity is not particularly limited, and for example, the actual amount of eccentricity in the present application is assumed to be smaller than that shown in the example.

[0030] The handle 30 is an operating tool for rotating the valve stem 20. The handle 30 is fixed to the valve stem 20 above the bearing portion 21. By rotating the handle 30, the valve body 100 can be manually raised and lowered, and the water flow path can be opened and closed. Although not illustrated in this embodiment, a drive mechanism for rotating the valve stem 20 (e.g., a motor serving as a drive source for rotating the valve stem 20, and a control unit for controlling the operation of the motor, etc.) can be provided above the valve housing portion 14, thereby allowing the valve body 100 to be automatically opened and closed.

[0031] The pressing part 40 is for pressing the valve body 100 toward the upstream side of the flow path when the valve body 100 moves to a position where it blocks the flow path. The pressing part 40 is, for example, a bolt with a curved head. The pressing part 40 is provided so as to penetrate the rear wall surface in the lower part of the valve accommodating part 14 (near the connection part with the valve chamber 11) from the front to the rear. The pressing part 40 is inserted from the inside to the outside of the valve accommodating part 14 and fixed to the valve accommodating part 14. In this embodiment, the pressing part 40 is disposed inside the guide rail 14a and provided so as to penetrate the guide rail 14a. The front-rear position of the pressing part 40 (the amount of protrusion toward the inside of the valve accommodating part 14) can be arbitrarily adjusted by adjusting the tightening position of the pressing part 40.

[0032] The configuration of the valve body 100 will be specifically described below.

[0033] The valve body 100 shown in FIGS. 4 and 5 mainly comprises a main body portion 110, a first seal portion 120, and a second seal portion .

[0034] The main body 110 is a part that forms the main structure of the valve body 100. The main body 110 has an axis along the up-down direction and is formed in a generally cylindrical shape with curved side surfaces. The main body 110 mainly includes an expanded diameter portion 111, a wedge portion 112, a wound portion 113, an end pressing portion 114, and a clamping portion 115.

[0035] The expanded diameter portion 111 is a portion formed by expanding the diameter of both the upper and lower ends of the main body portion 110. The expanded diameter portion 111 is formed to have a larger diameter than the upper and lower intermediate portions of the main body portion 110. The upper and lower expanded diameter portions 111 are formed to have the same diameter. The expanded diameter portion 111 is formed with a guide notch 111a (see FIG. 3) and a sealing notch 111b (see FIG. 5).

[0036] The guide cutout 111a shown in FIG. 3 is a recess formed so that the guide rail 14a provided on the valve box 10 can pass through. The guide cutout 111a is formed by cutting out the rear part of the expanded diameter part 111. The left and right width of the guide cutout 111a is formed slightly larger than the left and right width of the guide rail 14a so that the guide rail 14a can pass through. The guide cutout 111a is formed in each of the upper and lower expanded diameter parts 111. The guide rail 14a is arranged inside the guide cutout 111a, so that the rotation of the main body part 110 (valve body 100) is restricted. Furthermore, by arranging the guide cutout 111a and the guide rail 14a at the rear part of the valve body 100 and the valve accommodating part 14, the rotation can be restricted in a state in which the valve body 100 can be moved upstream by the pressing part 40.

[0037] 4 is a recess formed so that the second seal portion 130 can be disposed therein. The sealing notch 111b is formed by cutting out both left and right end portions of the lower expanded diameter portion 111. The front-to-rear width of the sealing notch 111b is formed to be slightly larger than the front-to-rear width of the second seal portion 130.

[0038] 3 and 4 is a portion that comes into contact with the pressing portion 40. The wedge portion 112 is formed so as to protrude rearward from the side surface (rear portion) of the main body portion 110. An inclined surface 112a that slopes from bottom to top toward the rear is formed at the lower portion of the wedge portion 112. By forming the inclined surface 112a, the pressing portion 40 that comes into contact with the wedge portion 112 from below can be smoothly guided when the main body portion 110 (valve body 100) descends.

[0039] The winding portion 113 shown in FIG. 4, FIG. 5, and FIG. 6(a) is a portion around which the lower end of the second seal portion 130 is wound. The winding portion 113 is formed on the bottom surface of the main body portion 110 in a pair on the left and right. The winding portion 113 is formed so as to protrude downward from both the left and right ends of the bottom surface of the main body portion 110. The winding portion 113 is formed in a plate shape having a predetermined thickness in the front and rear. The winding portion 113 is formed in the center of the front and rear of the main body portion 110. The outer surface of the winding portion 113 is formed in an R-shape (curved surface) that slopes downward and inward when viewed from the front (see FIG. 5). In addition, the lower end surface of the winding portion 113 is formed in a curved surface that bulges downward so as to make it easier to wind the second seal portion 130. The radius of curvature of the outer surface and the lower end surface of the winding portion 113 may be constant over the entire area, or may not be constant.

[0040] 5 is a portion for pressing down the lower end of the second seal portion 130 wound around the winding portion 113. The end holding portion 114 is formed in a plate shape with the plate surface facing left and right. The end holding portion 114 is disposed on the left and right inner sides of the winding portion 113. A predetermined gap is formed between the end holding portion 114 and the winding portion 113.

[0041] The clamping portion 115 shown in FIG. 4 is for clamping the first seal portion 120 from the front and rear. The clamping portion 115 is formed of, for example, a plate-shaped member bent into an L-shape. The clamping portion 115 is provided at least in front of and behind the winding portion 113 in a side view (see FIG. 4). For example, the clamping portion 115 can be provided only at a position facing the left and right winding portions 113 in the front and rear. For example, the clamping portion 115 can be provided in the entire left and right areas from the left end to the right end of the main body portion 110, including a position facing the left and right winding portions 113 in the front and rear. The clamping portion 115 is disposed so that the plate surface of one of the two plate-shaped portions formed approximately perpendicular to each other faces the front and rear and extends downward from the bottom surface of the main body portion 110. For convenience of explanation, the clamping portion 115 is appropriately omitted from FIG. 2, FIG. 5, etc.

[0042] The first seal portion 120 shown in Figs. 4 and 5 is provided at the bottom of the main body portion 110 and is capable of sealing between the main body portion 110 and the inner surface of the valve chamber 11. The first seal portion 120 is formed in a plate shape having a predetermined thickness in the front and rear directions. Specifically, the thickness of the first seal portion 120 is formed to be slightly larger than the distance between the pair of front and rear clamping portions 115. The thickness of the first seal portion 120 is also formed to be larger than the width of the second seal portion 130 described below. The first seal portion 120 is formed in a substantially semicircular shape that bulges downward when viewed from the front. The lower surface (curved surface) of the first seal portion 120 is formed to have a shape that can abut against the inner surface of the valve chamber 11 (see Fig. 2). The first seal portion 120 is formed of a material that has elasticity and a relatively low hardness (for example, rubber sponge, etc.).

[0043] The first seal portion 120 of this embodiment is formed in three parts, front and rear. Specifically, the first seal portion 120 has a pair of front and rear side portions 121 and a central portion 122 disposed between the pair of side portions 121. Notches 122a are formed in the upper left and right ends of the central portion 122. As a result, recesses (notches 122a) are formed in the upper left and right ends of the first seal portion 120, into which the second seal portion 130 wound around the winding portion 113 can be inserted.

[0044] The first seal portion 120 is attached to the lower part of the main body portion 110. At this time, the wound portion 113 and the second seal portion 130 wound around the wound portion 113 are inserted into the cutout portion 122a. In addition, the pair of front and rear side portions 121 and the central portion 122, which are divided into three parts, are clamped from the front and rear by the pair of front and rear clamping portions 115, thereby being fixed together.

[0045] The pair of front and rear side portions 121 and center portion 122 divided into three may be fixed to each other using adhesive, double-sided tape, or the like. The number of divisions of the first seal portion 120 is not particularly limited, and it is possible to form it in two or four or more divisions. The first seal portion 120 may be formed as an integral unit without being divided. The thicknesses of the pair of front and rear side portions 121 and center portion 122 may be the same (uniform) or different from each other. The materials of the pair of front and rear side portions 121 and center portion 122 may be the same or different from each other.

[0046] The second seal portion 130 is capable of sealing between the main body portion 110 and the inner surface of the valve accommodating portion 14 extending in the up-down direction. The second seal portion 130 is formed in a longitudinal shape having a generally constant width. The second seal portion 130 is formed of an elastic member (e.g., rubber sponge, etc.). In particular, the second seal portion 130 is preferably made of a silicone rubber sponge with an outer skin in order to reduce friction with the inner surface of the valve accommodating portion 14. The second seal portion 130 is provided in the main body portion 110 so as to extend upward from the first seal portion 120 toward the upstream side of the flow path.

[0047] Specifically, both ends (lower end) of the second seal portion 130 are wound around a pair of left and right winding portions 113 formed on the main body portion 110. The lower end of the second seal portion 130 is wound around the winding portion 113 from the outside to the inside, and the end of the second seal portion 130 is inserted between the winding portion 113 and the end pressing portion 114. By bending the lower end of the second seal portion 130 in a direction away from the inner surface of the valve accommodating portion 14 (toward the inside of the main body portion 110) in this manner, it is possible to prevent the end face of the second seal portion 130 from contacting the inner surface of the valve accommodating portion 14, and it is possible to prevent the second seal portion 130 from peeling off from the main body portion 110 due to friction with the valve accommodating portion 14. In addition, the end pressing portion 114 can suppress the end of the second seal portion 130 from coming off the winding portion 113. As a result, it is possible to hold the lower end of the second seal portion 130 to the main body portion 110 without fixing it to the main body portion 110 with a screw or the like.

[0048] In this embodiment, as shown in FIG. 6(a), an example is shown in which the lower end of the second seal portion 130 is sandwiched between the winding portion 113 and the end pressing portion 114, but the present invention is not limited to this. For example, as shown in FIG. 6(b), it is also possible to configure without providing the end pressing portion 114. In this case, as shown in FIG. 6(b), it is also possible to wind the second seal portion 130 around the winding portion 113 so that the end face of the lower end of the second seal portion 130 faces the inside of the left and right. In this case, the lower end of the second seal portion 130 may be fixed to the winding portion 113 by adhesion or the like, or may be fixed by being sandwiched from the front and back by the first seal portion 120.

[0049] As shown in FIG. 4, the second seal portion 130 is disposed so as to extend vertically upward in a straight line from the wound portion 113. At this time, the second seal portion 130 is disposed so as to pass through a sealing notch 111b formed in the lower expanded diameter portion 111. Furthermore, the second seal portion 130 is bent forward above the lower expanded diameter portion 111. As a result, the second seal portion 130 is formed in a curved shape in a side view. In this way, the second seal portion 130 is disposed in a horseshoe shape (approximately C-shape) in a plan view (see FIG. 7(a)) that surrounds the front half of the main body portion 110 from the center of the front-rear direction to the front end portion of the main body portion 110.

[0050] As described above, the lower end of the second seal portion 130 wound around the winding portion 113 is disposed inside the notch portion 122a of the first seal portion 120. This can prevent the second seal portion 130 from peeling off from the lower end. In particular, in this embodiment, the lower end of the second seal portion 130 is sandwiched from the front and rear by a pair of side portions 121 of the first seal portion 120, and is disposed so as to be in close contact with the first seal portion 120. This can improve the water-stopping property at the connection portion between the first seal portion 120 and the second seal portion 130 without bonding. Also, in this embodiment, the first seal portion 120 and the second seal portion 130 are not fixed (bonded) with an adhesive, double-sided tape, or the like. In this way, by separating the first seal portion 120 and the second seal portion 130, it becomes easy to replace only the first seal portion 120, which is easily damaged by being sandwiched by dust or the like. The first seal portion 120 and the second seal portion 130 can be brought into close contact with each other by, for example, being clamped from the front and rear by the clamping portion 115 described above.

[0051] The following describes how the valve device 1 configured as described above blocks the flow path. For ease of explanation, in the figures from Fig. 7 onwards, each part of the valve device 1 described up to this point is shown in a simplified schematic form. In addition, in some plan views such as Fig. 7(a) and Fig. 8(a), the second seal portion 130 is hatched to make it easier to see.

[0052] First, as shown in FIG. 7, a state in which the valve body 100 is retracted upward (to the valve housing portion 14) and the flow path is open will be described.

[0053] When the valve body 100 is retracted upward (to the valve housing portion 14), the inner surface of the valve chamber 11 is separated from the first seal portion 120 and the second seal portion 130, and the flow path is opened.

[0054] In this state, since the valve rod 20 is connected at a position offset forward with respect to the axis C of the main body 110 as described above, the main body 110 (valve body 100) is positioned at a position offset slightly rearward with respect to the valve housing portion 14. As a result, the front part of the second seal portion 130 and the inner surface of the valve housing portion 14 (particularly the front side of the inner surface) are in light contact with each other or are positioned so as to be spaced apart from each other. Note that, although a state in which there is a gap between the second seal portion 130 and the inner surface of the valve housing portion 14 is illustrated in FIG. 7, there does not necessarily have to be a gap.

[0055] In the state shown in FIG. 7, friction between the second seal portion 130 and the valve housing portion 14 is reduced, so that the driving force required to move the valve body 100 up and down can be reduced.

[0056] Next, a state in which the valve body 100 has advanced downward (to the valve chamber 11) and the flow path is closed, as shown in FIG. 8, will be described.

[0057] When the valve body 100 has advanced downward (into the valve chamber 11), the inner surfaces of the valve chamber 11 and the valve accommodating portion 14 come into contact with the first seal portion 120 and the second seal portion 130, sealing the gap between the valve body 100 and the valve chamber 11 and the valve accommodating portion 14, thereby blocking the flow path.

[0058] In this state, the wedge portion 112 provided on the main body portion 110 comes into contact with the pressing portion 40, and the pressing portion 40 presses the main body portion 110 forward (upstream of the flow path). As a result, the valve rod 20 undergoes slight elastic deformation, displacing the main body portion 110 forward, and the front portion of the second seal portion 130 is pressed against the inner surface of the valve accommodating portion 14. In this way, when the valve body 100 enters the valve chamber 11, the first seal portion 120 and the second seal portion 130 can close the flow path.

[0059] Particularly in this embodiment, the wedge portion 112 is formed at the same height as the front end portion of the second seal portion 130. This allows the pressing force on the wedge portion 112 to be transmitted to the front end portion of the second seal portion 130 without waste, and the water blocking ability of the second seal portion 130 can be effectively improved.

[0060] In addition, since the inner surface of the valve housing portion 14 is formed to extend in the vertical direction, there is no risk of dirt, mud, etc. accumulating on the inner surface. This makes it possible to prevent dirt, etc. from being caught between the second seal portion 130 and the inner surface of the valve housing portion 14, and improves the water-stopping ability of the second seal portion 130.

[0061] It is also preferable to set the positions, shapes, etc. of the pressing portion 40 and the wedge portion 112 so that the pressing portion 40 presses the wedge portion 112 forward only when the valve body 100 has descended to the lowest portion (the position where the flow path is blocked). With this configuration, the valve body 100 can be raised and lowered with a small driving force up to the position where the pressing portion 40 presses the wedge portion 112, so that the driving force of the valve body 100 can be effectively reduced.

[0062] Furthermore, if dirt or the like accumulates at the bottom of the valve chamber 11, the first seal portion 120 elastically deforms to embrace the dirt or the like. Therefore, even if dirt or the like accumulates at the bottom of the valve chamber 11, the flow path can be appropriately blocked. Note that it is preferable to form the front-to-rear thickness of the first seal portion 120 to be somewhat large so that when dirt or the like is trapped in this way, a portion that does not separate from the inner surface of the valve chamber 11 and maintains watertightness remains.

[0063] Various modified examples of the valve device 1 will be described below.

[0064] FIG. 9 shows a valve device 1A according to a first modified example (FIG. 9(a)) and a valve device 1B according to a second modified example (FIG. 9(b)).

[0065] In the valve device 1A according to the first modification (FIG. 9(a)), the wedge portion 112 is disposed at a position higher than the front end portion of the second seal portion 130. When the valve body 100 is pressed by the pressing portion 40, the lower portion of the valve rod 20 is elastically deformed forward with the upper portion of the valve rod 20 (the portion supported by the bearing portion 21 (see FIG. 1)) as a fulcrum, and the valve body 100 is displaced forward. Therefore, by disposing the wedge portion 112 at a position higher than the front end portion of the second seal portion 130 (the fulcrum side of the valve rod 20) as in the first modification, the amount of forward displacement of the valve body 100 (second seal portion 130) can be increased. This can effectively improve the watertightness of the second seal portion 130.

[0066] In the valve device 1B according to the second modified example (FIG. 9(b)), the wedge portion 112 is positioned lower than the front end of the second seal portion 130. By positioning the wedge portion 112 lower than the front end of the second seal portion 130 (on the opposite side to the fulcrum of the valve stem 20) as in the second modified example, the water pressure acting on the valve body 100 can be received at a lower position, and thus tilting of the axis of the valve body 100 can be suppressed. This makes it possible to suppress the retreat of the front end of the second seal portion 130 due to tilting of the valve body 100 caused by water pressure, and improves water stopping performance.

[0067] As shown in the first and second modified examples (see FIG. 9), the wedge portion 112 can be disposed at any position. It is also possible to configure the wedge portion 112 and the pressing portion 40 so that their positions can be changed (positions can be adjusted) to any position.

[0068] FIG. 10 shows a valve device 1C according to a third modified example.

[0069] In the valve device 1C according to the third modification, an adjustment unit 50 is provided at the rear of the main body 110. The adjustment unit 50 is capable of adjusting the position of the valve body 100 relative to the valve housing 14. The adjustment unit 50 is formed, for example, by a bolt having a curved head. The adjustment unit 50 is provided so as to penetrate the rear side surface at the upper part of the main body 110 from front to rear. The adjustment unit 50 is disposed with its head facing rearward. As a result, when the valve body 100 is disposed in the valve housing 14, the head of the adjustment unit 50 comes into contact with the rear inner side surface of the valve housing 14.

[0070] By adjusting the tightening position of the adjustment part 50 relative to the main body part 110, it is possible to change the amount of protrusion of the adjustment part 50 rearward from the main body part 110. This makes it possible to press the head of the adjustment part 50 against the inner surface of the valve accommodating part 14 and adjust the front-rear position of the main body part 110 (valve body 100).

[0071] By adjusting the front-to-rear position of the main body 110, it is possible to arbitrarily adjust the degree of contact between the second seal portion 130 and the inner surface of the valve accommodating portion 14. By appropriately adjusting the degree of contact between the second seal portion 130 and the inner surface of the valve accommodating portion 14, it is possible to appropriately prevent leakage of water circulating in the fluid.

[0072] 10, in particular, when the valve body 100 has the flow path open, the pressing portion 40 is not in contact with the wedge portion 112, and so a gap is likely to form between the front end of the second seal portion 130 and the inner surface of the valve accommodating portion 14. Therefore, by appropriately adjusting this gap (the degree of contact between the front end of the second seal portion 130 and the inner surface of the valve accommodating portion 14) using the adjustment portion 50, it is possible to appropriately prevent water leakage due to water pressure when the flow path is open (before the flow path is completely closed).

[0073] 11 and 12 show a valve device 1D according to a fourth modified example.

[0074] In the above embodiment (see Figures 7 and 8, etc.), a valve device 1 is exemplified in which the inner diameter of the valve accommodating portion 14 is configured to be approximately the same as the inner diameter of the valve chamber 11. However, it is also possible to form the inner diameter of the valve accommodating portion 14 to be larger than the inner diameter of the valve chamber 11, for example, as in a valve device 1D relating to a fourth modified example (see Figures 11 and 12).

[0075] For example, in the above embodiment (see Figs. 7 and 8, etc.), the inner diameter of the valve accommodating portion 14 is configured to be approximately the same as the inner diameter of the valve chamber 11, and therefore both left and right ends of the second seal portion 130 are configured to always be in contact with the inner surface of the valve accommodating portion 14. In other words, even when the valve body 100 is retreated into the valve accommodating portion 14 to open the flow path (see Fig. 7), both left and right ends of the second seal portion 130 are always in contact with the inner surface of the valve accommodating portion 14 and are compressed.

[0076] In contrast, in the valve device 1D according to the fourth modified example (see Figs. 11 and 12), the inner diameter of the valve housing portion 14 is configured to be larger than the inner diameter of the valve chamber 11. The second seal portion 130 is provided in the main body portion 110 so as to have a left-right width corresponding to the inner diameter of the valve chamber 11 in order to close the flow path (valve chamber 11). Therefore, in a state in which the valve body 100 retreats to the valve housing portion 14 and opens the flow path (see Fig. 11), gaps are formed between the left and right ends of the second seal portion 130 and the inner surface of the valve housing portion 14 (or the left and right ends of the second seal portion 130 are in light contact with the inner surface of the valve housing portion 14), and the second seal portion 130 is hardly compressed. Therefore, in the valve device 1D according to the fourth modified example, friction between the second seal portion 130 and the inner surface of the valve housing portion 14 when the valve body 100 is moved up and down is reduced, so that the driving force for moving the valve body 100 up and down can be reduced.

[0077] Incidentally, in the valve device 1D according to the fourth modified example, when the valve body 100 has advanced downward (into the valve chamber 11), the wedge portion 112 is pressed forward by the pressing portion 40. This brings the inner surfaces of the valve chamber 11 and the valve accommodating portion 14 into contact with the first seal portion 120 and the second seal portion 130, sealing the gap between the valve body 100 and the valve chamber 11 and the valve accommodating portion 14, thereby closing the flow path.

[0078] FIG. 13 shows a valve device 1E according to a fifth modified example.

[0079] The valve device 1E according to the fifth modified example shows an example in which the valve body 100 is formed in a shape other than a cylindrical shape (a circular shape in a plan view). Specifically, the valve device 1E according to the fifth modified example shows an example in which the valve body 100 is formed in a polygonal shape in a plan view (a hexagonal shape tapered toward the front in the illustrated example). In this way, the shape of the valve body 100 is not particularly limited, and it can be any shape that can open and close the fluid flow path.

[0080] FIG. 14 shows a valve device 1F according to a sixth modified example (FIG. 14(a)) and a valve device 1G according to a seventh modified example (FIG. 14(b)).

[0081] In the above embodiment, an example is shown in which the second seal portion 130 is bent and formed to surround the front half of the main body portion 110 (see Figure 1, etc.), but the present invention is not limited to this, and the shape of the second seal portion 130 can be changed as desired.

[0082] For example, in a valve device 1F according to a sixth modified example shown in Fig. 14(a), the second seal portion 130 is formed in an inverted L-shape in side view. Thus, in a valve device 1G according to a seventh modified example shown in Fig. 14(b), the second seal portion 130 has a portion (lower portion) that extends vertically in a straight line, a vertical middle portion that extends linearly forward and upward, and a portion (front end portion) that extends horizontally.

[0083] FIG. 15 shows a valve body 100 of a valve device 1H according to an eighth modified example.

[0084] In the valve body 100 according to the eighth modified example, the first seal portion 120 is integrally formed without being divided. The first seal portion 120 according to the eighth modified example is formed in a shape corresponding to the main body portion 110. Specifically, the first seal portion 120 is formed in a circular shape having approximately the same diameter as the main body portion 110 when viewed from the bottom. The surface of the first seal portion 120 is formed to have a shape that follows the valve box 10 (valve chamber 11 and valve accommodating portion 14). In particular, the lower end surface of the first seal portion 120 is formed in a shape that allows it to appropriately abut against the inner surface of the valve chamber 11 when the valve body 100 descends to close the flow path.

[0085] In this way, the first seal portion 120 according to the eighth modified example has approximately the same front-to-rear width (thickness in the flow path direction) as the main body portion 110. By configuring in this way, it is possible to ensure a maximum thickness in the flow path direction of the first seal portion 120. As a result, even if the first seal portion 120 embraces dust or the like when the valve body 100 descends and the first seal portion 120 abuts against the inner surface of the valve chamber 11, it is likely that a portion of the first seal portion 120 that maintains watertightness without being separated from the inner surface of the valve chamber 11 will remain. Note that the shape of the first seal portion 120 is not limited to this, and can be changed as desired.

[0086] 16 and 17 show a valve device 1J according to a ninth modified example.

[0087] The valve device 1J according to the ninth modified example can open and close the fluid flow path by raising and lowering the valve body 300, similarly to the above embodiment (see Figs. 1 and 2, etc.). A specific description will be given below. Note that descriptions of members having functions common to the above embodiment (see Figs. 1 and 2, etc.) will be omitted as appropriate.

[0088] The valve device 1J mainly comprises a valve frame 210, a valve body 300, a valve stem 220, and a pressing portion 240.

[0089] The valve frame 210 forms a part of the flow path, and is provided with the various components that constitute the valve device 1. The valve frame 210 mainly includes a partition portion 211, a guide portion 212, a bottom portion 213, and a bearing portion 214.

[0090] The partitioning parts 211 are disposed so as to face each other in the flow direction (front-rear direction) of the fluid in the flow channel. The partitioning parts 211 are formed in a plate shape having a predetermined thickness. A rectangular opening 211a through which the fluid can flow is formed in the lower part of the partitioning part 211.

[0091] The guide portion 212 guides the valve body 300 (main body portion 310) so that it can slide up and down. One guide portion 212 is disposed behind each of the left and right ends of the partition portion 211. The pair of left and right guide portions 212 are disposed at a predetermined distance from each other in the left-right direction. The guide portion 212 is disposed at a predetermined gap (a gap through which the main body portion 310 can move) between itself and the partition portion 211 in the front-rear direction. For convenience, the guide portion 212 is not shown in FIG. 16(b).

[0092] The bottom portion 213 forms the bottom surface of the flow path and supports the partition portion 211. The bottom portion 213 is formed so as to extend rearward from the lower end portion of the partition portion 211.

[0093] The bearing portion 214 is a portion that rotatably supports the valve rod 220. The bearing portion 214 is provided at the center rear portion of the upper end portion of the partition portion 211.

[0094] In the valve frame 210 configured in this manner, a valve chamber 210a is defined behind the lower part (opening 211a) of the partition part 211. The valve chamber 210a is a portion into which the valve element 300 enters when closing the flow path. Furthermore, in the valve frame 210, a valve accommodating part 210b is defined behind the upper part of the partition part 211. The valve accommodating part 210b is a portion into which the valve element 300 retreats when opening the flow path.

[0095] As shown in FIG. 16, the valve chamber 210a and the valve accommodating portion 210b do not necessarily have to be formed so as to surround the periphery of the valve body 300, but may be any that define a space in which the valve body 300 can be disposed.

[0096] The valve element 300 is capable of opening and closing the water flow path. The valve element 300 is arranged so as to be movable up and down from the valve chamber 210a to the valve housing portion 210b. The valve element 300 is arranged behind the partition portion 211. The valve element 300 mainly includes a main body portion 310, a first seal portion 320, and a second seal portion 330.

[0097] The main body 310 is a portion that forms the main structure of the valve body 300. The main body 310 is formed in a rectangular flat plate shape with the plate surface facing in the front-rear direction. The lower end of the main body 310 is bent backward. As a result, the main body 310 is formed in a roughly L-shape when viewed from the side. A pair of left and right wedge portions 312 are formed on the left and right ends of the back surface of the main body 310.

[0098] The first seal portion 320 is provided at the bottom of the main body portion 310, and is capable of sealing between the main body portion 310 and the inner surface of the valve chamber 210a (the upper surface of the bottom portion 213). The first seal portion 320 is formed in a rectangular parallelepiped shape. By forming the front-to-rear width of the first seal portion 320 to be somewhat large, it is possible to maintain watertightness when the first seal portion 320 traps dust or the like.

[0099] The second seal portion 330 is capable of sealing between the main body portion 310 and the inner surface (the rear surface of the partition portion 211) of the valve accommodating portion 210b extending along the up-down direction. The second seal portion 330 is formed in a longitudinal shape having a generally constant width. The second seal portion 330 is provided in the main body portion 310 so as to extend upward from the first seal portion 320 toward the upstream side of the flow path.

[0100] Specifically, the lower end (both ends) of the second seal portion 330 are connected to both left and right ends of the front upper part of the first seal portion 320. The second seal portion 330 is arranged so as to extend upward from the lower end on the front side surface of the main body portion 310. The upper parts of the second seal portion 330 extending from the left and right are connected to each other near the upper part of the main body portion 310. As a result, the second seal portion 330 is formed into an inverted U-shape when viewed from the front. In this way, the second seal portion 330 is arranged so as to follow both left and right ends and the upper end of the front side surface of the main body portion 310.

[0101] In this modified example, the first seal portion 320 and the second seal portion 330 are formed integrally. However, it is also possible to form the first seal portion 320 and the second seal portion 330 as separate bodies, for example, as in the above embodiment (see FIG. 5, etc.).

[0102] The valve stem 220 is for raising and lowering the valve body 300 up and down. An upper part of the valve stem 220 is rotatably supported by a bearing part 214. A lower part of the valve stem 220 is connected to the valve body 300 (main body part 310). The male thread of the valve stem 220 is screwed into the female thread of the valve body 300 (main body part 310).

[0103] The pressing portion 240 is for pressing the valve body 300 toward the upstream side of the flow path when the valve body 300 moves to a position where it blocks the flow path. The pressing portion 240 is disposed at a position where it comes into contact with the wedge portion 312 when the valve body 300 descends to a position where it blocks the flow path. The pressing portion 240 is supported by an appropriate member (not shown). It is also possible to configure the pressing portion 240 so that its front-rear position can be adjusted as desired. Note that, for the sake of convenience, the pressing portion 240 is not shown in FIG. 6(a).

[0104] In the valve device 1J configured in this manner, as in the valve device 1 of the above embodiment (see Figures 1 and 2, etc.), the flow path can be opened and closed by rotating the valve rod 220 to raise and lower the valve body 300 up and down.

[0105] The second seal portion 330 is provided so as to extend upward from the first seal portion 320 toward the upstream side of the flow path, and seals between the second seal portion 330 and the rear surface (the inner surface of the valve accommodating portion) of the partition portion 211 extending in the up-down direction. This prevents dirt, mud, etc. from accumulating between the second seal portion 330 and the partition portion 211, improving the sealing performance.

[0106] When the valve body 300 has advanced downward (to the valve chamber 210a) (as shown in FIGS. 16 and 17), the partition portion 211 and the bottom portion 213 (the inner surfaces of the valve chamber 210a and the valve accommodating portion 210b) come into contact with the first seal portion 320 and the second seal portion 330, respectively, and the flow path is blocked. In this state, the wedge portion 312 is pressed forward by the pressing portion 240. This displaces the main body portion 310 forward, and the second seal portion 330 is pressed against the back surface of the partition portion 211.

[0107] 18 and 19 show a valve device 1K according to a tenth modified example.

[0108] The valve device 1K according to the tenth modification is a valve device 1J according to the ninth modification with a partial modification. In the following, the parts of the valve device 1K according to the tenth modification that differ from the valve device 1J according to the ninth modification will be described, and the description of the other common parts will be omitted as appropriate.

[0109] The wedge portions 312 in the valve device 1K are formed at both left and right ends of the back surface of the main body portion 310. More specifically, the wedge portions 312 are formed at positions facing the guide portion 212 in the front-rear direction. Moreover, the wedge portions 312 are formed at a slightly lower position compared to the ninth modified example (see FIG. 16).

[0110] The pressing portion 240 in the valve device 1K is disposed at a position where it comes into contact with the wedge portion 312 when the valve body 300 descends to a position where it closes the flow path. The pressing portion 240 is disposed so as to penetrate the guide portion 212 from the front to the rear, and is fixed to the guide portion 212.

[0111] The second seal portion 330 in the valve device 1K is formed to have a wider left-right width than the second seal portion 330 according to the ninth modified example (see Figs. 16 and 17). Both left and right side portions of the second seal portion 330 are formed at positions overlapping with the wedge portion 312 in rear view (see Fig. 18(a)). This allows the second seal portion 330 to be strongly pressed against the rear surface of the partition portion 211 when the wedge portion 312 is pressed forward by the pressing portion 240, thereby improving water stopping performance.

[0112] 20 to 22 show modified examples of the first seal portion 120 shown in FIG. 4 and the like.

[0113] A cutout 123 is formed in the lower part of the first seal part 120a according to the first modification shown in FIG. 20(a). The cutout 123 is formed so as to cut out the lower part of the first seal part 120a from left to right. The cutout 123 is formed in a slit shape with a relatively small front-to-rear width. The depth (vertical width) of the cutout 123 is not particularly limited, but it is preferable to form it larger than the diameter of the dust or the like that is expected to flow under the first seal part 120a. By forming two cutouts 123 in this way, the lower part of the first seal part 120a is divided into three parts along the front-to-rear direction. Note that the illustrated example shows an example in which two cutouts 123 are formed, but the number of cutouts 123 is not particularly limited.

[0114] By forming the cutout 123 in this manner, the lower part of the first seal portion 120a is divided into front and rear parts. As a result, even if dust or the like is trapped in one of the divided parts and the part is deformed when the valve body 100 is lowered, the deformation is unlikely to be transmitted to the other part divided by the cutout 123. Therefore, even if dust or the like is trapped, the deterioration of the water stopping ability can be suppressed. The other modified examples shown in Figs. 20 and 22 can also achieve the same effect (suppression of deterioration of the water stopping ability). The configurations of the other modified examples will be described below.

[0115] The first seal portion 120b according to the second modification shown in Fig. 20(b) is formed by dividing the first seal portion 120a according to the first modification into three parts, front and rear (by combining three members). For example, the first seal portion 120b according to the second modification can be formed by a pair of front and rear side portions 121 and a central portion 122 disposed between the pair of side portions 121, similar to the first seal portion 120 shown in Fig. 4 etc.

[0116] Although a detailed description is omitted, the first seal portion 120c and the like according to the other modified examples shown in FIG. 20 and FIG. 22 can be divided into a plurality of parts (combining a plurality of members) in the same manner as the first seal portion 120b according to the second modified example. In this case, the number of divisions is not particularly limited. The materials of the divided members may be the same or different from each other. For example, by disposing a relatively low hardness (soft) material between relatively high hardness materials, the soft material can absorb deformation caused by dust or the like being trapped, and the deformation of one member can be prevented from being transmitted to other members, thereby preventing a decrease in water-stopping properties.

[0117] The first seal portion 120c according to the third modified example shown in Fig. 20(c) is obtained by modifying the shape of the notch 123 of the first seal portion 120a according to the first modified example. Specifically, the notch 123 of the first seal portion 120c is formed in a shape (valley shape) in which the front-rear width increases toward the bottom. By increasing the width of the notch 123 in this manner, clogging of the notch 123 with dirt or the like can be suppressed.

[0118] 20(d) to 20(f) show variations in the shape of the notch 123. For example, as in the first seal portion 120d according to the fourth modified example shown in FIG. 20(d), the notch 123 can be formed in a curved shape (an arc shape convex upward in side view). Also, as in the first seal portion 120e according to the fifth modified example shown in FIG. 20(e), the notch 123 can be formed in a curved shape different from that of the fourth modified example (an arc shape convex downward in side view). Also, as in the first seal portion 120f according to the sixth modified example shown in FIG. 20(f), it is possible to form only one of the pair of front and rear opposing surfaces of the notch 123 so as to be inclined and the other so as to extend vertically. In this way, the shape of the notch 123 can be changed arbitrarily.

[0119] Next, a modification of the first seal portion 120 for preventing the trapping of dust or the like will be described.

[0120] First, with reference to FIG. 21, an outline of the configuration for preventing debris T from being caught between the first seal portion 120 and the bottom of the flow path (valve chamber 11) will be described.

[0121] Assume that debris T flows under the first seal portion 120 when the valve body 100 (first seal portion 120) begins to descend to close the flow path (left diagram in FIG. 21(a)). In this case, debris T attempts to flow from the front to the rear under the first seal portion 120, but if the gap between the first seal portion 120 and the bottom of the valve chamber 11 becomes small, debris T becomes caught between the first seal portion 120 and the bottom (right diagram in FIG. 21(a)). It is undesirable for debris T to become caught under the first seal portion 120 from the viewpoint of ensuring watertightness.

[0122] In order to prevent the debris T from being caught, it is possible to form the shape of the bottom surface of the first seal portion 120 so that the outflow side (rear portion) is higher than the inflow side (front portion) rather than being horizontal, as in the first seal portion 120g according to a seventh modified example shown in Fig. 21(b). With this configuration, even if the first seal portion 120g descends, a gap through which the debris T can pass can be secured, so that the debris T can be prevented from getting caught in the first seal portion 120. Below, the conditions for preventing the debris T from being caught between the first seal portion 120g and the bottom of the valve chamber 11 in this manner will be specifically described.

[0123] In order to prevent debris T from getting caught between the first seal portion 120g and the bottom of the valve chamber 11, the condition is that "the gap between the first seal portion 120g and the bottom of the valve chamber 11 (the flow path for debris T) does not become smaller than the height of debris T by the time the debris T passes through the lower end of the inlet side of the first seal portion 120g and reaches the lower end of the outlet side."

[0124] In particular, when it is assumed that the debris T passes through the inlet end of the first seal portion 120g at a timing when the height of the debris T and the gap at the inlet end of the first seal portion 120g are almost the same (see the left diagram in FIG. 21(b)), the above condition becomes strictest. In this case, the condition is that "the difference in the vertical positions of the inlet side lower end and the outlet side lower end of the first seal portion 120g (hereinafter referred to as "shortening amount y") is equal to or greater than the amount of descent of the valve body 100 (first seal portion 120g) within the time it takes for the debris T to pass under the first seal portion 120g." This condition is expressed mathematically as follows:

[0125] (Number 1) y ≧ V1 × (W / V2)

[0126] Here, W (cm) is the front-to-rear width of the first seal portion 120. Furthermore, V1 (cm / sec) is the descending speed of the valve body 100 (first seal portion 120). Furthermore, V2 (cm / sec) is the speed (fluid flow velocity) of the debris T. Furthermore, y (cm) is the amount of shortening (minimum amount of shortening).

[0127] By setting the shortening amount y so as to satisfy the above formula 1, it is possible to prevent the dirt T from being caught (caught) in the first seal portion 120g.

[0128] In addition to the above formula (Mathematical Formula 1), the shape of the front and rear midpoints of the opposing first seal portion 120 must be located above the straight line L (see Figure 21 (b)) connecting the lower end of the inlet side and the lower end of the outlet side (not protruding below the straight line L).

[0129] Incidentally, since the flow velocity of a fluid is related to the water depth of the irrigation channel (the deeper the water depth, the faster the flow velocity), from the viewpoint of preventing debris T from getting stuck, it is preferable to apply a flow velocity to Equation 1 that is set lower (shallower) than the general (usual) water depth of the irrigation channel. Furthermore, the above Equation 1 is theoretical, and in practice it is preferable to set the shortening amount y by further taking into account a safety factor. In other words, it is preferable to set "actual y = y × safety factor".

[0130] FIG. 22 shows a modification of the first seal portion 120 that satisfies the above-mentioned conditions (Equation 1 and line L (see FIG. 21)).

[0131] The first seal portion 120h according to the eighth modified example shown in Fig. 22(a) is formed by extending downward the front end portion (the frontmost portion among the portions partitioned by the notch portion 123) of the first seal portion 120c according to the third modified example (see Fig. 20(c)). In this manner, by extending the inlet side lower end of the first seal portion 120h downward, it is possible to prevent the debris T from getting caught, similar to the example shown in Fig. 21(b).

[0132] The first seal portion 120i according to the ninth modified example shown in Fig. 22(b) is obtained by forming the bottom of the first seal portion 120c according to the third modified example (see Fig. 20(c)) in an inclined shape. Specifically, the vertical width of the lower part of the first seal portion 120i divided by the cutout portion 123 is formed to become shorter in stages from the front to the rear. In this way, it is also possible to form the bottom of the first seal portion 120c in an inclined shape from front to rear.

[0133] The first seal portion 120j according to the tenth modification shown in FIG. 22(c) and FIG. 22(d) is provided with a plate-shaped portion 124 on the front surface of the first seal portion 120a according to the first modification (see FIG. 20(a)). The plate-shaped portion 124 is formed in a fan shape that is one size larger than the main body portion (dashed line portion) of the first seal portion 120j when viewed from the front (FIG. 20(d)). As a result, the outer peripheral portion of the plate-shaped portion 124 is formed so as to protrude outward from the main body portion of the first seal portion 120j. A plurality of slits 124a are formed in the outer peripheral portion of the plate-shaped portion 124 along the circumferential direction. As a result, even after the outer peripheral portion of the plate-shaped portion 124 comes into contact with the valve chamber 11, water flows through the slits to prevent an increase in water pressure on the inflow side, and deformation of the outer peripheral portion of the plate-shaped portion 124 can be prevented.

[0134] By providing the plate-shaped portion 124 in this manner, it is possible to prevent large debris T that may become trapped in the first seal portion 120j when the valve body 100 (first seal portion 120j) descends from flowing below the first seal portion 120j.

[0135] The slits 124a may be formed more densely, and the outer peripheral portion of the plate-shaped portion 124 may be formed in a comb shape, a brush shape, or the like. Also, the slits 124a do not necessarily have to be formed. The plate-shaped portion 124 may be formed of a material different from that of the other portions of the first seal portion 120j. For example, the main body of the first seal portion 120j may be formed of rubber sponge, and the plate-shaped portion 124 may be formed of ordinary rubber.

[0136] In the following, a configuration for mounting the valve device 1 and the like as described above to the irrigation channel 2 will be described.

[0137] FIG. 23 shows an example of an irrigation channel 2. The irrigation channel 2 is an open channel (U-shaped ditch) that guides water to be supplied to a paddy field (farm field). An outlet section 3 is formed midway in the flow direction of the irrigation channel 2 to take in water into the paddy field. The outlet section 3 is composed of an open channel (U-shaped ditch) formed to connect the irrigation channel 2 and the paddy field. An attachment groove 3a is formed in a pair of side walls of the outlet section 3 to attach the valve device 1. The attachment groove 3a is formed by cutting out the side walls of the outlet section 3 from top to bottom.

[0138] 23 and 24 show the valve device 1 having a mounting plate 60. The mounting plate 60 is for mounting the valve device 1 to the irrigation channel 2. The mounting plate 60 is formed in a rectangular plate shape. The material of the mounting plate 60 is not particularly limited, but it can be formed from, for example, a hard PVC plate, an expanded PVC plate, recycled plastic, etc. The mounting plate 60 is placed with the plate surface facing the front-rear direction (the direction in which the valve chamber 11, the upstream portion 12, and the downstream portion 13 of the valve box 10 are aligned). A through hole 61 is formed in the lower center of the mounting plate 60, penetrating the mounting plate 60 from front to rear. The inner diameter of the through hole 61 is formed to be approximately the same as the outer diameter of the upstream portion 12. The upstream portion 12 of the valve box 10 is inserted into the through hole 61.

[0139] The mounting plate 60 is disposed at the rear end of the upstream section 12 (at a position adjacent to the valve accommodating section 14). An upper portion of the mounting plate 60 (above the upstream section 12) is fixed to the valve accommodating section 14 by a bolt 71. A lower portion of the mounting plate 60 (below the upstream section 12) is fixed to the leg 11a of the valve device 1 by the bolt 71. The leg 11a is a member for placing the valve device 1 in a stable position on the ground or the like, and is fixed to the bottom of the valve box 10. When fixing the mounting plate 60, a spacer 72 can be used as necessary.

[0140] 23 and 24 are merely examples and are not limiting. For example, it is possible to use fasteners other than the bolts 71 for fastening, or to adhere the plate with an adhesive or the like. In addition, the object to which the mounting plate 60 is fixed is not limited to the valve housing portion 14 or the leg portion 11a, and the mounting plate 60 can be fixed to any portion.

[0141] The valve device 1 with the mounting plate 60 fixed in this manner can be attached to the irrigation channel 2 by inserting the mounting plate 60 into the mounting grooves 3a of the hanging portion 3. Specifically, both left and right ends of the mounting plate 60 are inserted into the pair of mounting grooves 3a, respectively. This fixes the valve device 1 to the hanging portion 3. Note that at this time, both left and right ends of the mounting plate 60 may be cut as desired to match the spacing between the pair of mounting grooves 3a. Water flowing through the irrigation channel 2 is supplied to the rice paddy through the valve device 1. By opening and closing the valve device 1 as desired, water can be supplied to the rice paddy at any time.

[0142] When the valve device 1 is attached to the irrigation channel 2 using a mounting plate 60 as shown in Fig. 24, the member supporting the valve device 1 (mounting plate 60) is positioned at a position offset from the center of gravity of the valve device 1 (generally near the axis of the valve housing portion 14). In such a configuration, the valve device 1 is supported in a so-called cantilevered state, and a force is generated in the direction in which the valve device 1 falls from the front side to the rear side, centered around the vicinity of the lower end portion. Therefore, in the example of Fig. 24, the mounting plate 60 is positioned as close to the center of gravity (near the valve housing portion 14) as possible, thereby suppressing the force causing the valve device 1 to fall.

[0143] It is also possible to purposely arrange the valve device 1 in an inclined state by utilizing the above-mentioned misalignment between the center of gravity and the mounting plate 60. For example, by arranging the valve device 1 so that it is inclined backward and downward, it is possible to promote the discharge of water from within the valve box 10.

[0144] 25 to 29 show a modification of the mounting plate 60 shown in FIGS.

[0145] The mounting plate 60a according to the first modified example shown in Fig. 25 includes a receiving portion 62. The receiving portion 62 is a portion that supports the valve device 1 from below. The receiving portion 62 is formed in a plate shape extending horizontally. The receiving portion 62 is provided so as to protrude rearward from the lower portion of the mounting plate 60a (below the valve box 10). The leg portion 11a provided on the valve box 10 is placed on the receiving portion 62.

[0146] In this way, the mounting plate 60a can support the valve device 1 from below via the receiving portion 62, so that the force that would cause the cantilevered valve device 1 to fall backward can be suppressed.

[0147] 26(a) shows a mounting plate 60b according to a second modified example, which is disposed midway between the front and rear of the upstream section 12. The mounting plate 60b is provided at a position slightly farther away from the valve accommodating section 14 and the leg section 11a than the mounting plate 60 shown in Fig. 24, and is therefore fixed with bolts 71 to the upstream section 12, rather than to the valve accommodating section 14 and the leg section 11a.

[0148] In this way, the mounting plate 60b can be provided at any position in the upstream section 12. The mounting plate 60b can also be provided at any position in the downstream section 13, rather than in the upstream section 12. The mounting plate 60b can also be provided in the valve chamber 11 (near the center of gravity of the valve device 1). When the mounting plate 60b is provided in the valve chamber 11, a substantially U-shaped cutout corresponding to the outer shape of the valve chamber 11 may be formed instead of the circular through hole 61.

[0149] A mounting plate 60c according to a third modified example shown in FIG. 26(b) is attached so as to be fitted into the upstream section 12. Specifically, a pipe 63 is provided on the mounting plate 60c so as to penetrate the mounting plate 60c from the front to the rear. The pipe 63 is formed so as to protrude rearward from the mounting plate 60c. The outer diameter of the pipe 63 is formed so as to be substantially the same as the inner diameter of the upstream section 12. The pipe 63 is fitted into the inside of the upstream section 12 from the front and fixed by a bolt 71. In this way, the mounting plate 60c can also be disposed outside (forward) the upstream section 12.

[0150] An attachment plate 60d according to a fourth modified example shown in Figs. 27 to 29 is for attaching the valve device 1 to the irrigation channel 2 in which a pipe 4 is provided, rather than to the hanging portion 3 (see Fig. 23).

[0151] The pipe 4 is for taking in water from the irrigation channel 2 into the rice paddies. The pipe 4 is installed so as to penetrate the side of the irrigation channel 2 from front to back. The pipe 4 is formed so as to protrude rearward from the irrigation channel 2. The valve device 1 can be connected to the irrigation channel 2 by fitting the pipe 4 into the upstream portion 12 of the valve device 1.

[0152] The mounting plate 60d is fixed to the valve housing 14 and the leg 11a by bolts 71, similar to the mounting plate 60 shown in FIG. 24. A bracket 64 is provided on the back of the mounting plate 60d. A pair of brackets 64 are provided on the left and right sides of the upper part of the mounting plate 60d, sandwiching the valve housing 14. The bracket 64 has a through hole penetrating in the vertical direction. A pile 73 with its longitudinal direction facing the vertical direction is inserted and fixed in the through hole of the bracket 64. A longitudinal member such as a single pipe can be used as the pile 73. The lower part of the pile 73 is buried in the ground of the paddy field (field). In this way, the valve device 1 is supported via the mounting plate 60d. The mounting plate 60d according to the fourth modification does not need to be attached to the hanging port 3 (see FIG. 23), so it can be formed with a narrower left-right width than the mounting plate 60 shown in FIG. 23.

[0153] As described above, the valve device 1 according to this embodiment has the following features: A valve element 100 that can open and close a fluid flow path by moving up and down; a valve chamber 11 that forms a part of the flow path and into which the valve element 100 enters when the flow path is closed; a valve housing portion 14 that is disposed above the valve chamber 11 and into which the valve body 100 retreats when the flow path is opened; A valve device 1 comprising: The valve body 100 is A main body portion 110, a first seal portion 120 provided in a lower portion of the main body portion 110 and capable of sealing with an inner surface of the valve chamber 11; a second seal portion 130 provided on the main body portion 110 so as to extend upward from the first seal portion 120 toward the upstream side of the flow path and capable of sealing with an inner surface of the valve accommodating portion 14 extending along the up-down direction; It is equipped with the following. By configuring in this manner, it is possible to improve the water stopping ability. Specifically, since the second seal portion 130 seals between the second seal portion 130 and the inner surface of the valve housing portion 14 extending in the vertical direction, dirt, mud, etc. are not accumulated between the second seal portion 130 and the inner surface of the valve housing portion 14, and the sealing ability can be improved. Furthermore, by providing the second seal portion 130 only on the upstream side of the valve body 100 as in this embodiment, it is possible to reduce the sliding resistance between the second seal portion 130 and the valve housing portion 14.

[0154] In addition, the main body 110 is The cylinder has an axis along the vertical direction and a curved side surface. The second seal portion 130 is It is provided along the side surface of the main body portion 110. By configuring in this way, it is possible to improve the water stopping property.

[0155] The valve device 1 also includes: The valve further includes a valve stem 20 (shaft member) connected to the main body 110 for moving the main body 110 up and down. The valve stem 20 is It is connected at a position eccentric to the upstream side of the flow path with respect to the axis C of the main body portion 110 . With this configuration, by offsetting the main body portion 110 rearward, the pressing force of the second seal portion 130 against the inner surface of the valve accommodating portion 14 decreases, and the sliding resistance can be reduced.

[0156] The valve device 1 also includes: The valve device further includes a pressing portion 40 that presses the valve element 100 toward the upstream side of the flow path when the valve element 100 moves to a position where it closes the flow path. With this configuration, the water pressure of the fluid flowing through the flow path becomes maximum when the flow path is blocked, but water leakage from the flow path upward (toward the valve accommodating portion 14) can be effectively prevented by pressing the second seal portion 130 against the inner surface of the valve accommodating portion 14. In addition, since the second seal portion 130 presses the valve element 100 when the valve element 100 moves to a position where it blocks the flow path, the sliding resistance between the second seal portion 130 and the inner surface of the valve accommodating portion 14 can be reduced when the valve element 100 is in any other position.

[0157] In addition, the valve device 1C is The valve device further includes an adjustment section 50 capable of adjusting the position of the valve body 100 relative to the valve housing section 14 . By configuring it in this manner, the relative position of the valve body 100 with respect to the valve accommodating portion 14 can be adjusted to adjust the distance and contact between the second sealing portion 130 and the inner surface of the valve accommodating portion 14 so as to appropriately prevent water leakage.

[0158] The lower end of the second seal portion 130 is It is disposed inside the notch 122 a formed in the first seal portion 120 . With this configuration, it is possible to prevent the second seal portion 130 from peeling off from the lower end portion due to sliding against the inner surfaces of the valve accommodating portion 14 and the valve chamber 11.

[0159] The lower end of the second seal portion 130 is It is disposed so as to be in close contact with the first seal portion 120 . With this configuration, the flow path can be blocked without bonding the first seal portion 120 and the second seal portion 130 together.

[0160] The lower end of the second seal portion 130 is It is bent in a direction away from the inner surface of the valve accommodating portion 14 . With this configuration, it is possible to prevent the second seal portion 130 from peeling off from the lower end portion due to sliding against the inner surfaces of the valve accommodating portion 14 and the valve chamber 11.

[0161] The valve rod 20 according to this embodiment is one embodiment of a shaft member according to the present invention.

[0162] Although one embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0163] For example, in the above embodiment, an example was shown in which the pressing portion 40 that presses the valve body 100 forward was provided, but the present invention is not limited to this, and it is not necessarily required to provide the pressing portion 40.

[0164] In the above embodiment, the valve rod 20 is offset forward with respect to the axis C of the cylindrical valve body 100 to reduce the sliding resistance between the front end of the second seal portion 130 and the inner surface of the valve housing portion 14, but a similar configuration can be adopted even for a valve body 100 formed in a shape other than cylindrical. That is, regardless of the shape of the valve body 100, it is possible to provide the valve rod 20 at a position where the contact condition (sliding resistance) between the front end of the second seal portion 130 and the inner surface of the valve housing portion 14 is appropriate.

[0165] In addition, in the above embodiment, an example was shown in which the pressing portion 40 and the adjustment portion 50 were constructed using bolts, but the present invention is not limited to this, and the pressing portion 40 and the adjustment portion 50 can be constructed using any material (such as a plate material formed into an appropriate shape).

[0166] The valve device 1 etc. configured as described above can also be operated using an appropriate operating device. This makes it possible to remotely operate the valve device 1 etc., or to automatically operate it based on an appropriately set schedule or the detection results of the water level etc. An example of the configuration of an electric actuator 416 for operating the valve device 1 etc. configured as described above will be described below.

[0167] 30 to 32, the electric actuator 416 is a device for operating a water supply control device such as the above-mentioned valve device 1, and includes an actuator body 422 and a mounting base 424 for mounting the actuator body 422 to the water supply control device. Note that the electric actuator 416 is not limited to the above-mentioned valve device 1, and can also be used to operate (open and close) the displacement mechanism of a water supply control device such as other water faucets and downspouts.

[0168] 33 and 34, the actuator body 422 includes a main body case 430 including a cover member 432 and a holding member 434. The cover member 432 has a cylindrical side wall 464 and a disk-shaped top wall 466 that seals the upper end of the side wall 464. On the other hand, the holding member 434 has a bottom wall 472 and a first fitting portion 474 that fits into the side wall 464 of the cover member 432 from below, and the cover member 432 and the holding member 434 are detachable from each other. The specific configuration of the main body case 430 will be described later.

[0169] A solar panel 436 is attached on the main body case 430. The solar panel 436 is supported at a predetermined angle by a metal holder 438. The solar panel 436 is provided so as to be rotatable laterally with respect to the main body case 430 (i.e., the orientation of the solar panel 436 can be changed). Specifically, an annular groove 464a extending in the circumferential direction is formed on the outer peripheral surface of the upper end of a side wall 464 of a cover member 432 provided in the main body case 430. Meanwhile, the holder 438 has a rectangular plate-shaped mounting portion 438a having an insertion hole formed in the center, rectangular plate-shaped leg portions 438b rising from both ends of the mounting portion 438a, and a support portion 438c extending at a predetermined angle from the upper end of the leg portion 438b. Then, the solar cell panel 436 is fixed onto the support portion 438c, and the inner edge portion (the peripheral portion of the insertion hole) of the mounting portion 438a is slidably fitted into the annular groove 464a, whereby the solar cell panel 436 is rotatably attached to the main body case 430. Although not shown, a screw for preventing rotation is attached from the outside to the leg portion 438b, and by pressing the side wall 464 from the outside with this screw, unintentional rotation of the solar cell panel 436 is prevented (i.e., rotation is prevented).

[0170] As shown in Figs. 30 and 31, the solar cell panel 436 is connected to an electronic board 446 provided in the main body case 430 via a wiring 440. The wiring 440 connected to the solar cell panel 436 is provided so as to extend in the vertical direction along the outer surface of the side wall 464, and is drawn into the main body case 430 through a groove-shaped wiring cover 442 that forms a wiring path together with the side wall 464, and a through hole 464b formed at the lower end of the side wall 464. At this time, the wiring 440 is adjusted to a length that can correspond to the rotation of the solar cell panel 436, and a surplus portion depending on the direction in which the solar cell panel 436 faces can be stored in a space formed between the solar cell panel 436 and the top wall 466. A cable gland 444 (a wiring holding member) is provided in the mounting portion 438a of the holder 438, and the cable gland 444 prevents unintended displacement of the wiring 440. Furthermore, the wiring 440 is provided with a connection portion 440a (connector), and this connection portion 440a is disposed at the bottom of the main body case 430 (see FIG. 40).

[0171] 33 and 34, the inside of the main body case 430 accommodates an electronic board 446, a storage battery 448, and a drive mechanism including a motor 450 and a rotating shaft 452. In other words, the components accommodated in the main body case 430 include electric parts (electrical equipment) such as the electronic board 446, the storage battery 448, and the motor 450. In addition, a part of the rotating shaft 452 is provided so as to protrude downward from the main body case 430.

[0172] Although not shown, the electronic board 446 is provided with a control unit including a CPU and memory, a wireless communication unit including a wireless communication module, and the like. The control unit is electrically connected to the motor 450, an operation panel 454 (see FIG. 40), a wireless communication unit, a sensor terminal, and the like. The CPU of the control unit is responsible for the overall control of the electric actuator 416, and controls the driving of the motor 450, etc. The memory is a comprehensive reference to ROM, RAM, HDD, etc., and stores a control program that controls the operation of the electric actuator 416, and functions as a work area when the CPU operates. The wireless communication unit is connected to an antenna, and performs wireless communication with an external device such as a repeater via the antenna.

[0173] The storage battery 448 is provided in the upper part inside the main body case 430, and stores the power generated by the solar panel 436. The motor 450 (drive source of the drive mechanism) is provided on the upper surface of the raised bottom part 472a of the bottom wall 472, and is driven by the power stored in the storage battery 448. A rotating shaft 452 extending in the vertical direction is connected to the tip of the output shaft 450a of the motor 450.

[0174] The rotating shaft 452 includes a square rod-shaped shaft body 452a, the upper end of which is fixed to the output shaft 450a, and a square cylindrical movable part 452b, which is fitted on the shaft body 452a so as to be slidable in the vertical direction (axial direction). A coupling part 452c, which is connected to the valve rod 20 of the valve device 1, is formed at the lower end of this movable part 452b. Such a rotating shaft 452 rotates around its axis upon receiving a driving force from the motor 450, and rotates the valve rod 20 of the valve device 1. When the rotating shaft 452 is attached to a water supply control device in which the valve rod 20 moves up and down by rotation, the movable part 452b moves up and down with the up and down movement, thereby expanding and contracting. In addition, although not shown, a locking part such as a ball flange is provided at the upper part of the shaft body 452a, and a locked part such as a round hole that engages with the locking part is provided at the upper part of the movable part 452b. The locked portion of the movable portion 452b is locked to the locking portion of the shaft body 452a, so that the rotating shaft 452 can be held in a contracted state (a state in which the movable portion 452b is in the upper position). This makes it possible to form a space for manually rotating the handle 30 (i.e., inserting the hand) after the connection between the rotating shaft 452 and the valve stem 20 of the valve device 1 is released when the electric actuator 416 breaks down.

[0175] An operation panel 454 (see FIG. 40) and a power switch 456 for the user to directly operate the electric actuator 416 are provided at the bottom inside the main body case 430. The operation panel 454 is appropriately provided with operation sections such as an up switch (button), a down switch, and a setting dial for the electronic board 446, confirmation lamps indicating whether the power is on or off, whether there is an abnormality, and the type of operation mode, and a wiring connection terminal (an example of a wiring connection section) for checking the log of the electronic board 446.

[0176] As shown in FIG. 35, the mounting base 424 includes a cylindrical side wall 460. An inspection opening 460a is formed in the side wall 460 for checking the operation of the rotating shaft 452 and for performing maintenance work such as the above-mentioned handle operation and cleaning. A lid 460b constituting a part of the side wall 460 is attached to the inspection opening 460a in a detachable (openable and closable) manner. A plurality of holes 460c are formed in the upper end of the side wall 460 and are arranged at predetermined intervals in the circumferential direction. A groove 461 used for fixing the valve device 1 is formed in the lower end of the side wall 460. The detailed configuration of the groove 461 will be described later.

[0177] Next, the configuration of main body case 430 will be specifically described with reference to Figures 36 and 37 in addition to Figures 33 and 34. As described above, main body case 430 includes cover member 432 and holding member 434 which are detachable from each other.

[0178] 33, 34, and 36, the cover member 432 is formed in a cylindrical shape with a top having a cylindrical side wall 464 and a disk-shaped top wall 466 that seals the upper end of the side wall 464. The cover member 432 is formed of a synthetic resin such as hard polyvinyl chloride. The inside diameter of the side wall 464 of the cover member 432 is, for example, 140 mm.

[0179] In this embodiment, the side wall 464 and the top wall 466 of the cover member 432 (and thus the main body case 430) are formed to have an airtight structure. As a result, even if the lower surface side (bottom wall side) of the main body case 430 is not airtight, air cannot escape from the main body case 430 when the electric actuator 416 is submerged, so that water can be prevented from entering the main body case 430. In other words, even if the electric actuator 416 is submerged, air can be stored in the main body case 430, so that water can be stopped at a certain flood level (water level) where the water pressure is balanced with the air pressure (internal pressure) in the main body case 430. Therefore, by arranging the electric components such as the electronic board 446, the storage battery 448, and the motor 450, which are likely to break down when submerged, above the flood level, the electric components can be prevented from getting wet even if the electric actuator 416 is submerged during a flood or the like.

[0180] However, in this invention, "airtight" refers to maintaining airtightness and watertightness during the service life to such an extent that even if the main body case 430 is submerged, the air in the main body case 430 does not leak from that part. In addition, when calculating the flooding level at the time of submersion, the lower end X of the part having the airtight structure of the cover member 432 is used, and if the side wall 464 has a connecting part or a hole that is not airtight, the upper edge position of the connecting part or the hole becomes the lower end X. In this embodiment, the upper edge position of the hole 464c formed to bolt the holding member 434 to the lower end of the side wall 464 becomes the lower end X. The length from the lower end X of the cover member 432 to the lower surface of the top wall 466, that is, the height dimension of the internal space of the cover member 432, is, for example, 300 [mm]. The method of calculating the flooding level is described in JP 2017-193914 A by this applicant, so please refer to it.

[0181] As described above, an annular groove 464a for rotatably supporting the holder 438 of the solar cell panel 436 is formed in the outer peripheral surface of the upper end of the side wall 464 of the cover member 432. Furthermore, a through hole 464b (see FIG. 30) for passing the wiring 440 is formed in the lower end of the side wall 464, and a plurality of holes 464c for bolting the holder 434 to the side wall 464 are formed lined up at predetermined intervals in the circumferential direction.

[0182] Furthermore, a first buffer 468 and a second buffer 470 formed of a buffer material such as a closed-cell sponge are provided in the upper part of the inside of the cover member 432. The first buffer 468 is formed in a disk shape and attached to the lower surface of the top wall 466. The first buffer 468 abuts (presses) the storage battery 448 from above, thereby restricting the vertical movement (wobbling) of the storage battery 448. On the other hand, the second buffer 470 is formed in a cylindrical shape and attached to the upper part of the inner surface of the side wall 464. The second buffer 470 abuts against the storage battery 448 from the side, thereby restricting the lateral movement of the storage battery 448. In addition, each of the first buffer 468 and the second buffer 470 also functions as a gap filling member that fills a space (gap) in the cover member 432. The first buffer 468 and the second buffer 470 reduce the gap volume (air) in the main body case 430, thereby lowering the level of water entering the main body case 430 when submerged. The first buffer 468 and the second buffer 470 may be formed separately or integrally. The shapes of the first buffer 468 and the second buffer 470 can be changed as appropriate. For example, the first buffer 468 may be formed in a square plate shape, and the second buffer 470 may be divided into a plurality of pieces and arranged in a circumferential direction.

[0183] As shown in Figs. 33, 34 and 37, the holding member 434 has a disk-shaped bottom wall 472 and is made of metals such as aluminum and stainless steel, and synthetic resins such as hard polyvinyl chloride. The bottom wall 472 has a raised bottom part 472a in the shape of a rectangular cylinder at its center. The top wall of the raised bottom part 472a is provided at a height position higher than the expected flood level when submerged, and the motor 450 is attached to the top surface of the top wall of the raised bottom part 472a. In addition, an air vent hole 472b is formed in the upper part (top wall) of the raised bottom part 472a, and a filter 472c is provided in the air vent hole 472b. The air vent hole 472b prevents air pockets that do not contribute to the increase in air pressure inside the main body case 430 from being formed below (inside) the raised bottom part 472a when submerged. It also functions as an air vent in normal times.

[0184] The holding member 434 also includes a first fitting portion 474 that protrudes in the up-down direction from the peripheral edge of the bottom wall 472. The first fitting portion 474 is a fitting portion that is fitted into the side wall 464 of the cover member 432 from below, and includes a cylindrical fixing portion 474a that extends downward from the peripheral edge of the bottom wall 472, and two curved plate-like guide portions 474b that extend upward to face each other from the peripheral edge of the bottom wall 472. A plurality of first bolt holes 474c (an example of a hole) that screw into first fixing bolts 480 (an example of a fixing member) are formed in the fixing portion 474a at predetermined intervals in the circumferential direction. The cover member 432 is fixed to the holding member 434 by fitting the fixing portion 474a into the lower end portion of the side wall 464 of the cover member 432 and fastening a first fixing bolt 480 to a first bolt hole 474c through a hole 464c formed in the side wall 464. On the other hand, the guide portion 474b is a portion that guides the up and down movement (attachment / detachment) of the cover member 432 with respect to the holding member 434, and is also used as a support portion (leg portion) of a stand 482 to which the storage battery 448 is attached.

[0185] Furthermore, the holding member 434 includes a flange portion 476 that protrudes outward from the lower end of the fixing portion 474a of the first fitting portion 474, and a short cylindrical second fitting portion 478 that protrudes downward from the lower surface of the flange portion 476. The flange portion 476 supports the lower end of the side wall 464 of the cover member 432, and is a portion that is supported by the upper end of the side wall portion 460 of the mounting base 424. A plurality of second bolt holes 478a that screw into second fixing bolts 484 are formed in the second fitting portion 478 at predetermined intervals in the circumferential direction. The second fitting portion 478 is fitted into the upper end portion of the side wall portion 460 of the mounting base 424, and the second fixing bolt 484 is fastened to the second bolt hole 478a through the hole 460c of the mounting base 424, thereby fixing the mounting base 424 to the lower end portion of the retaining member 434 (and thus the main body case 430) (see Figure 32).

[0186] 30 to 32, such an electric actuator 416 is used in a state where a first fitting portion 474 of a holding member 434 is fitted into a lower end portion of a side wall 464 of a cover member 432 and fastened with a first fixing bolt 480. That is, under normal circumstances, the cover member 432 is held by the holding member 434 in a reference position where the cover member 432 covers the drive mechanism and internal devices such as an electronic board 446.

[0187] Here, when it becomes necessary to check or operate internal devices such as an operation unit disposed in main body case 430, or to attach or detach connection part 490a of wiring 490, it is possible to remove cover member 432. However, it takes time to remove cover member 432. In addition, since solar cell panel 436 is fixed to cover member 432, it is necessary to perform an operation of disconnecting connection part 440a of wiring 440 for solar cell panel 436 in order to remove cover member 432. Furthermore, it is also conceivable to provide cover member 432 with an openable and closable door, but this would result in incomplete waterproofing of cover member 432 (main body case 430).

[0188] Therefore, in this embodiment, by providing a drop stopper 486 capable of holding the cover member 432 at an open position above the reference position, it is possible to check, inspect, and operate the internal device without removing the cover member 432 or providing a door on the cover member 432. The configuration of the drop stopper 486 will be specifically described below.

[0189] As shown in Figs. 37 to 39, the drop stopper 486 is provided on one of the guide parts 474b of the first fitting part 474 of the holding member 434. The drop stopper 486 is formed in an arm shape extending in the vertical direction, and an engagement part 486a protruding outward is formed at the upper end of the drop stopper 486. The drop stopper 486 is attached to the guide part 474b so as to be swingable laterally with the lower end as a fulcrum, and can be displaced between a retracted position (see Fig. 38) where the engagement part 486a is retracted inward from the inner surface of the side wall 464 of the cover member 432, and a protruding position (see Fig. 39) where the engagement part 486a protrudes outward from the inner surface of the side wall 464. In addition, a biasing member 488 such as a compression coil spring is provided at the upper end of the drop stopper 486. The biasing member 488 biases the drop stopper 486 outward, that is, in the direction from the retracted position toward the protruding position.

[0190] In the electric actuator 416 having such a drop stopper portion 486, when the cover member 432 is pulled up after the first fixing bolt 480 is released from the first bolt hole 474c, as shown in Fig. 39, when the lower end of the side wall 464 passes the locking portion 486a of the drop stopper portion 486, the drop stopper portion 486 is displaced to the protruding position by the biasing force of the biasing member 488. Then, the cover member 432 is locked by the locking portion 486a of the drop stopper portion 486 in the protruding position, so that the cover member 432 is held in the open position even if the operator releases his / her hand from the cover member 432.

[0191] 40, when the cover member 432 is in the open position, the operation panel 454 arranged at the lower part inside the main body case 430 and the connection parts 440a, 90a of the wiring 440, 90 are exposed to the outside. Therefore, an operator can operate the operation parts such as the up / down switch provided on the operation panel 454 and check the state of the electric actuator 416 using the confirmation lamp without removing the cover member 432. In addition, an operator can easily disconnect and connect the connection parts 440a, 90a of the wiring 440, 90.

[0192] When returning the cover member 432 from the open position to the reference position, it is preferable to press the drop stopper portion 486 with a finger and move it to the retracted position to release the lock (stop) of the cover member 432 by the drop stopper portion 486. When the lock by the drop stopper portion 486 is released, the cover member 432 can return (descend) to the reference position while being guided by the guide portion 474b of the first fitting portion 474.

[0193] 41, a drop-out prevention bolt having a thread 480a formed only at the tip is used as the first fixing bolt 480. Also, an inclined surface 474d is formed on the upper side of the first bolt hole 474c of the fixing portion 474a of the first fitting portion 474, which is inclined downward so as to approach the inner surface of the side wall 464. By using a drop-out prevention bolt as the first fixing bolt 480, when the first fixing bolt 480 is released from the first bolt hole 474c, the first fixing bolt 480 is prevented from falling off the cover member 432, and the first fixing bolt 480 is prevented from being lost. Furthermore, as shown in FIG. 42, an inclined surface 474d is formed on the upper side of the first bolt hole 474c. Therefore, even if the first fixing bolt 480 is retracted inward, it is gradually pushed outward by the inclined surface 474d, thereby preventing the first fixing bolt 480 from getting caught on the fixing portion 474a of the first fitting portion 474 while the cover member 432 is descending.

[0194] 30, a through hole 492 for passing a wire 490 connecting a sensor terminal such as a water level sensor and an electronic board 446 (controller) is provided on the contact surface between the lower end of the side wall 464 of the cover member 432 and the flange 476 of the holding member 434. In addition to the wire 490 for the sensor terminal, the through hole 492 can be used to pass wires for electrical components disposed outside the main body case 430, such as an antenna, a camera, and a solar panel, as appropriate. Also, as shown in FIG. 40 and FIG. 43 to FIG. 45, a groove 494 for fitting the wire 490 is provided on the upper surface of the flange 476 of the holding member 434 at a position corresponding to the through hole 492.

[0195] In this embodiment, a notch 464d is formed at the lower end of the side wall 464, and a plurality of ribs 496 (three in this embodiment) are formed on the upper surface of the flange portion 476, thereby providing a plurality of through holes 492 (two in this embodiment) and a groove portion 494. The rib 496 is formed in an L-shape having a horizontal piece 496a that is fitted into the notch 464d at the lower end of the side wall 464 and a vertical piece 496b that extends along the inner surface of the side wall 464. The horizontal piece 496a (first rib) of the rib 496 forms the through hole 492 together with the notch 464d at the lower end of the side wall 464. By providing the through hole 492 (a portion not having airtightness) at the lower end of the side wall 464 of the cover member 432, the airtightness of the cover member 432 is ensured to the maximum extent. In addition, the horizontal pieces 496a of the ribs 496 also function as positioning portions for positioning the cover member 432 relative to the holding member 434 in the circumferential direction.

[0196] On the other hand, each of the vertical pieces 496b (second ribs) of the rib 496 is thicker toward the bottom, and a groove 494 that narrows toward the bottom is formed on the back side of the through hole 492. By fitting the wiring 490 into this groove 494, the wiring 490 can be positioned so as not to move when the cover member 432 is moved to the open position or removed. Although not shown, it is preferable to attach a sleeve (stopper) having an outer diameter larger than the width of the groove 494 to a portion of the wiring 490 that is inside (on the electronic board 446 side) the portion that fits into the groove 494. As a result, even if the wiring 490 is pulled outward, the sleeve is caught by the rib 496, and the wiring 490 is prevented from being pulled outward any further.

[0197] Further, a deformable member 498 formed of an open-cell sponge or the like is provided in the through hole 492 (between the ribs 496). The deformable member 498 is deformable between an expanded state in which the through hole 492 is sealed and a compressed state in which the wiring 490 can be inserted through the through hole 492. That is, when the through hole 492 is not used, the deformable member 498 is in an expanded state to seal the through hole 492, thereby appropriately preventing insects and the like from entering the main body case 430. Note that the deformable member 498 may be provided in the notch 464d at the lower end of the side wall 464 (i.e., the cover member 432 side) instead of or in addition to being provided between the ribs 496 (i.e., on the holding member 434 side).

[0198] As described above, according to this embodiment, the cover member 432 is provided with the drop prevention portion 486 capable of holding the cover member 432 in the open position above the reference position. Therefore, the cover member 432 (side wall 464 and top wall 466) has an airtight structure to ensure the waterproofing of the main body case 430, and the internal devices such as the operating unit can be easily checked without removing the cover member 432.

[0199] In the above-described embodiment, an electric actuator 416 using a direct-coupled type drive mechanism in which the rotating shaft is directly coupled to a motor (drive source) is exemplified. However, the present invention is not limited to this, and it is also possible to use, for example, a drive mechanism equipped with a reduction mechanism.

[0200] Moreover, the configuration of the stopper portion 486 shown in the above embodiment is merely an example, and the specific configuration of the stopper portion 486 can be changed as appropriate.

[0201] The following describes the configuration for mounting the above-mentioned electric actuator 416 to the valve device 1. Specifically, the configuration of the lower part (side wall part 460) of the electric actuator 416 and the configuration of the upper part (valve housing part 14 and bearing part 21) of the valve device 1 will be described.

[0202] 35, 46, and 47, a groove 461 used for fixing to the valve device 1 is formed at the lower end of the side wall 460. As shown in Fig. 35, the groove 461 is formed at three locations at equal intervals (90 degree intervals) in the circumferential direction of the side wall 460. In the following, of the three grooves 461, the groove 461 formed on the right side of the paper in Fig. 35 will be focused on and a specific configuration of the groove 461 will be described.

[0203] The groove portion 461 is formed by cutting out the lower end portion of the side wall portion 460 toward the upper side. The groove portion 461 includes a slit portion 461a having a substantially constant width along the up-down direction, a circular portion 461b formed at the upper end portion of the slit portion 461a, and a circular countersunk portion 461c formed to recess the periphery of the circular portion 461b.

[0204] 35 and 47, a protrusion 463 that protrudes inward is formed on the inner surface of the side wall portion 460. The protrusion 463 is formed to protrude radially inward from the vicinity of the lower end portion of the side wall portion 460 (slightly above the groove portion 461). The protrusion 463 is formed to extend over approximately the entire circumferential area of ​​the side wall portion 460.

[0205] The area or shape of the protruding portion 463 is not particularly limited as long as it can come into contact with the upper end of the valve housing portion 14 as described below.

[0206] As shown in Figures 2 and 48, a bearing portion 21 is provided on the upper portion of the valve housing portion 14. Note that the bearing portion 21 is illustrated in a simplified form in Figure 2. Also, in Figure 48, the handle 30 is not illustrated.

[0207] 48, the bearing portion 21 mainly includes a bearing mount 22 and a bearing 23. The bearing mount 22 is made of metal such as aluminum or stainless steel, or synthetic resin such as rigid polyvinyl chloride.

[0208] The bearing mount 22 is for mounting the bearing 23 to the valve housing portion 14. The bearing mount 22 mainly includes a plate-shaped portion 22a and a fixed portion 22b.

[0209] The plate-shaped portion 22a is a portion to which a bearing 23, which will be described later, is fixed. The plate-shaped portion 22a is formed in a rectangular shape (square shape) in a plan view. The diagonal line (the distance from one vertex to the opposite vertex) of the plate-shaped portion 22a is formed to be approximately the same as the inner diameter of the valve accommodating portion 14. A through hole 22c for inserting the valve rod 20 is formed in the center of the plate-shaped portion 22a.

[0210] In the illustrated example, the plate-shaped portion 22a is formed in a rectangular shape, but the shape of the plate-shaped portion 22a is not particularly limited. For example, the plate-shaped portion 22a may be formed in a substantially circular shape having a diameter substantially equal to the inner diameter of the valve accommodating portion 14.

[0211] The fixing portion 22b is a portion for fixing the bearing mount 22 to the valve accommodating portion 14. The fixing portion 22b is formed so as to extend upward from four vertices of the plate-shaped portion 22a, which is formed in a substantially rectangular shape. As a result, four fixing portions 22b are formed at equal intervals in the circumferential direction of the valve accommodating portion 14. In the illustrated example, the plate-shaped portion 22a and the fixing portion 22b are formed from a single plate material, but it is also possible to form the plate-shaped portion 22a and the fixing portion 22b from separate members and fix them by an appropriate method (for example, welding, etc.).

[0212] The fixed portion 22b is formed with a pair (two) of upper and lower through holes 22d. A female thread (not shown) is formed in the through holes 22d of the fixed portion 22b so that bolts B1 and B2, which will be described later, can be fastened. In addition, the valve accommodating portion 14 is formed with a pair of upper and lower through holes 14b at positions facing the through holes 22d formed in the fixed portion 22b.

[0213] As shown in Fig. 48, the bearing mount 22 is disposed inside (near the upper end) of the valve accommodating portion 14. In this state, the through hole 22d formed in the fixing portion 22b is aligned with the through hole 14b formed in the valve accommodating portion 14. Thereafter, as shown in Fig. 47, a bolt B1 is inserted from the outside of the valve accommodating portion 14 into the lower through hole 14b and fastened to the through hole 22d of the fixing portion 22b. This fixes the bearing mount 22 to the valve accommodating portion 14.

[0214] The bearing 23 shown in Fig. 48 is a member that rotatably supports the valve rod 20. Specifically, the bearing 23 is composed of a bearing and a housing portion that houses the bearing. The bearing 23 is fixed to the center of the upper surface of the bearing mount 22. The valve rod 20 inserted into the through hole 22c of the bearing mount 22 is rotatably supported by the bearing 23.

[0215] Next, a procedure for attaching the electric actuator 416 to the upper part of the valve device 1 as shown in Figs. 32 and 50 will be described.

[0216] 47, the bolt B2 is inserted into the upper through-hole 14b of the valve housing portion 14. At this time, the bolt B2 is tightened to a position where the head of the bolt B2 is spaced a certain distance from the outer circumferential surface of the valve housing portion 14.

[0217] Next, the side wall portion 460 of the electric actuator 416 is brought close to the valve accommodating portion 14 from above, and the side wall portion 460 is arranged to cover the upper part of the valve accommodating portion 14. At this time, by aligning the position of the bolt B2 with the position of the groove portion 461 of the side wall portion 460, the position of the side wall portion 460 with respect to the valve accommodating portion 14 can be determined.

[0218] 49, when the side wall portion 460 is placed over the valve accommodating portion 14, the upper end of the valve accommodating portion 14 comes into contact with a protrusion 463 formed on the side wall portion 460. This causes the side wall portion 460 to be supported by the valve accommodating portion 14. At this time, since the bolt B2 is not in contact with the side wall portion 460, the load of the electric actuator 416 is not applied to the bolt B2, and therefore the fastening (rotation) of the bolt B2 is not hindered.

[0219] In this state, the electric actuator 416 can be fixed to the valve device 1 (valve accommodating portion 14) by fastening the bolt B2. At this time, the head of the bolt B2 is accommodated in the countersunk portion 461c. In this manner, the bearing portion 21 (fixing portion 22b) can be used to fix the bearing portion 21 to the valve accommodating portion 14 and to fix the electric actuator 416 to the valve accommodating portion 14. This makes it possible to reduce the number of parts and simplify the configuration.

[0220] As described above, the grooves 461 are formed in three locations on the side wall 460, and therefore three of the four fixing parts 22b formed on the bearing mount 22 are used to fix the electric actuator 416 (side wall 460). The remaining fixing part 22b can be used to fix a lid 460b (see FIG. 30, etc.) that closes the inspection hatch 460a. For example, the lid 460b can be fixed to the fixing part 22b using a wing bolt or the like. [Explanation of symbols]

[0221] 1 Valve gear 11 Valve chamber 14 Valve housing 20 Valve stem 100 Valve body 110 Main body 120 First seal part 122a Notch 130 Second seal part

Claims

1. a valve body that can open and close a fluid flow path by moving up and down; a valve chamber that forms a part of the flow path and into which the valve element enters when the flow path is closed; a valve housing portion that is disposed above the valve chamber and into which the valve body retreats when the flow path is opened; A valve device comprising: The valve body is A main body portion, a first seal portion provided at a lower portion of the main body portion and capable of sealing with an inner surface of the valve chamber; a second seal portion provided on the main body portion so as to extend upward from the first seal portion toward the upstream side of the flow path and capable of sealing between the main body portion and an inner surface of the valve accommodating portion extending along a vertical direction; A valve device comprising:

2. The main body portion is The cylinder has an axis along the vertical direction and a curved side surface. The second seal portion is Provided along the side surface of the main body, The valve arrangement of claim 1.

3. Further, a shaft member is provided which is connected to the main body portion and moves the main body portion up and down. The shaft member is The main body is connected to a position eccentric to the upstream side of the flow path from the axis of the main body. The valve arrangement of claim 2.

4. The valve body may further include a pressing portion that presses the valve body toward an upstream side of the flow path when the valve body moves to a position where the valve body closes the flow path. The valve arrangement of claim 1.

5. Further comprising an adjustment unit capable of adjusting the relative position of the valve body with respect to the valve housing portion. The valve arrangement of claim 1.

6. The lower end of the second seal portion is The first seal portion is disposed on the inner side of the notch formed in the first seal portion. The valve arrangement of claim 1.

7. The lower end of the second seal portion is The first seal portion is disposed so as to be in close contact with the first seal portion.

7. The valve arrangement of claim 6.

8. The lower end of the second seal portion is The valve accommodating portion is bent in a direction away from the inner surface thereof. A valve arrangement according to any one of claims 1 to 7.

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