JP5855853B2 - Disc valve device for irrigation - Google Patents

Description

  The present invention relates to a disk valve that opens and closes the opening of the water conduit so that a certain amount of water is stored in the water reservoir in the water conduit that guides irrigation water supplied from a storage dam to the reservoir. The present invention relates to a disc valve that opens and closes an opening of a water conduit by a valve body through a lever and a valve rod by vertically moving a float in a float chamber provided in the water storage tank.

  In growing rice and other agricultural crops, it is necessary to manage water suitable for each growing season. Therefore, in recent years, various irrigation techniques have been proposed and put into practical use. For example, as an irrigation device that automatically stops irrigation when the water level of a paddy field reaches a predetermined water level, the water level sensor detects the water level of the paddy field, and the motor-operated valve is set so that the detected water level matches a preset target water level. Something that operates is used. In order to keep the water level constant, a so-called float valve is also used in which the water level is detected by a float and the valve is closed by a buoyancy acting on the float when the water level reaches a predetermined value.

  Furthermore, a transmission / distribution channel organization (agricultural pipeline) for reducing the amount of water from a water source such as a storage dam and using it as agricultural water is also widely used. Pipelining of such agricultural canals began in the 1960s, and in 1990, approximately 200,000 hectares of water, or 16% of the developed paddy fields, could be supplied through agricultural pipelines.

  Such agricultural irrigation pipelines are usually composed of pipelines for water transmission and distribution, and adjustment ponds, pressurizing pumps, pressure regulating facilities (depressurized water tanks), water hydrants, etc. Yes, this pressure regulation facility (depressurized water tank) requires equipment to keep the water level of the pressure regulation facility constant. That is, when water is pumped to a pipeline (pipeline) using a high head such as a pump or a reservoir or a dam, the water is stored in a farm pond or the pressure is cut in the middle of the pipeline. In order to create the water surface, a decompression and water level adjustment device is required. As such a pressure reducing and water level adjusting device, a disk valve has been conventionally used for the purpose of preventing trouble caused by earth and sand mixed in water, dust, etc., or a water hammer.

  Such a disk valve is composed of a float that moves up and down in the float chamber in the water tank due to fluctuations in the water level in the water tank, and a valve body that opens and closes the opening of the conduit pipe by the vertical movement of the float. Is disclosed, for example, in Patent Document 1 (Japanese Utility Model Laid-Open No. 61-35281).

  In this Patent Document 1, in order to solve the problem that the opening of the disk valve decreases when the water level is close to the maximum water level and the minute opening continues for a long time, a water conduit provided in the water storage tank is provided. In the disk valve that is opened and closed by a valve body through a lever and a valve rod by the vertical movement of the float in the float chamber provided in the water reservoir, the upward opening communicates with the water reservoir provided in the float chamber. A shutter with multiple openings is provided at the mouth, and this shutter is moved up and down by a sub-float installed in the water tank. When the water level in the water tank approaches the highest level, the communication port is closed and the highest level is reached. Has proposed a disk valve configured to open a communication port.

Japanese Utility Model Publication No. 61-35281

  As described above, it has been proposed to use the float's buoyancy to double the force by the lever principle and close the opening of the water conduit provided in the water tank. However, since the discharge pressure of the water discharged from the opening of the water conduit provided in the water tank increases in proportion to the height difference from the water source, it is not possible to reliably close the opening of the water conduit. It was not easy.

If the opening of the water conduit cannot be completely closed, the pressure of the water discharged from the gap may cause deformation of the disk valve itself or the packing. In addition, it was considered that the water leaked when the opening of the water conduit was not completely blocked caused a load on the float and the lever and valve rod operating in conjunction with the float.
Therefore, the first object of the present invention is to provide a disk valve for an irrigation facility that can reliably close the opening of the water conduit while utilizing the buoyancy of the float.

In addition, when installing and maintaining irrigation facilities, if the disk valve installed in the irrigation facility increases in size, it will hinder the transportation and installation of the equipment that makes it up, and it will be difficult to perform maintenance. There was a problem. Furthermore, the increase in the size of the disc valve has led to an increase in the size of the irrigation facility itself, making it difficult to secure not only the installation area of the disc valve but also the installation location of the irrigation facility itself.
Accordingly, a second object of the present invention is to provide a disk valve for an irrigation facility that is capable of reliably closing the opening of the water conduit as described above, but further reducing the size.

To solve any of the above problems, and doubling the float buoyancy by two or more lever handset up of the present invention, and so as to close the opening of the water conduit by a disk-shaped valve element at the force irrigation use disk valve device, i.e. there is provided a irrigation disk valve device having a double leverage slave Organization.

That is, in the present invention, a disk that operates in conjunction with the vertical movement of the float in the float chamber provided in the water tank, with the opening of the water conduit provided in the irrigation water storage area such as a pond or water tank. a irrigation disk valve device for opening and closing by Jo of the valve body, the buoyancy of the float with increasing by more than one lever slave Organization, the valve body, closing the opening of the conduit in the increased force An irrigation disk valve device is provided.

The two or more lever slave Organization inputs a first lever slave Organization doubling this by entering the buoyancy of the float, the power of the first lever slave Organization, further doubling the force a second lever slave Organization for outputting, further as in the third lever slave Organization doubling this by entering the power of the second lever slave Organization, using a plurality of lever sub Organization Thus, a larger force can be obtained, and the opening of the water conduit can be closed by the disc-shaped valve body. Wherein each lever handset structure may be configured by an arm member that swings about a fulcrum (lever crank member), the arm member is as if each comprise a fulcrum, the force point, the action point Composed.

In the above present invention, the two or more lever slave Organization is input and the first lever slave Organization for inputting the buoyancy of float force point, a force at the working point in the first lever slave Organization to consists of a second lever slave Organization, the valve body on the disk can be configured so as to open and close the opening of the conduit by the force of the action point of the second lever slave Organization.

It said first lever slave Organization may be constituted by the arm members constituted by using the steel. The arm member has a power point to which the buoyancy of the float is input through an upper joint formed in a shaft shape or a rod shape, a fulcrum pivotally attached to a disk body that is a fixed structure, and the fulcrum as a center. And an action point located on the opposite side of the force point. At this time, the distance from the fulcrum to the action point is set to at least twice the distance from the fulcrum to the force point, preferably about 4 times. And in this working point, and pivotally mounted to Lower joint formed in the shaft-like or rod-like, to input the power of the working point to the power point of the second lever slave Organization. The second lever slave Organization also using the arm member configured with steel, working point at a distance from the point of force, and the fulcrum is provided further ahead. Fulcrum of the second lever slave Organization may also be pivotally attached to the disk body. The distance from the fulcrum of the second lever slave Organization to the power point, more than twice the distance from the fulcrum to the point, preferably set to about 3 times.

Then, the point of action of the second lever slave Organization, pivotally attached to the shaft-like or rod-disk joints, the distal end of the disk joint is connected to an umbrella-shaped disk canopy. A disc member that serves as a valve body is provided on the lower surface of the disc canopy, and the disc member is disposed so as to face the opening of the water conduit and close the opening.

By the structure described above, first entered force action point of the lever handset structure of, would be doubled by double leverage slave Organization, it converts the buoyancy of the float to a larger force The force can be changed to close the opening of the water conduit of the disk member.

In particular, the above construction, the force point of the second lever slave Organization placed below the working point of the first lever slave Organization, the second lever handset acting point and the fulcrum of the structure first by placing the fulcrum side of the lever slave Organization, it is possible to miniaturize the entire irrigation disk valve device.

Moreover, the point of action of the second lever slave Organization upper and lower center position of the swinging range is preferably set to be present in the second lever slave Organization fulcrum same horizontal plane . This is to reduce the moving distance in the lateral direction of the action point of the second lever slave Organization. For example, in the state where the fulcrum and the action point of the second lever slave Organization are on the same horizontal plane, it constitutes a point of action of the second lever slave Organization, to be present in below the virtual line can do.

Further, in the present invention, the disc shaped valve body (i.e. "disc member") is provided on the bottom center of the canopy member formed like an umbrella, it is increased by the two or more lever slave Organization It is desirable that the applied force is distributed and input to two or more locations on the canopy member. That, is dispersed in a position to be a point symmetry about the disk-shaped valve body, it is desirable to enter an increased force by the two or more lever slave Organization. This is because the disc-shaped valve body can be stably moved by this configuration, and the opening of the water conduit can be reliably closed without causing the valve body to be glazed.

And in irrigation disk valve device according to the present invention, the two or more lever handset structure includes a first lever slave Organization for inputting the buoyancy of the float to the power point, the action of the first lever slave Organization consists of a second lever slave Organization for inputting a force at the point, the second lever slave Organization is present under the canopy member formed like an umbrella disk-shaped valve body is provided, the It is desirable that the disc-like valve body provided on the canopy member is configured to be pulled downward. By constructing the canopy member on which the water pressure of the irrigation water discharged from the opening of the water conduit acts, rather than pushing it down, it eliminates the disc-shaped valve disc and so on, thereby ensuring more reliable guidance. This is because the opening of the water pipe can be closed.

According to irrigation disk valve device of the present invention configured as described above, the double leverage slave Organization, by changing the buoyancy of the float in the greater force, the opening of the conduit provided in the water tank Can be occluded.

  As a result, even when the discharge pressure of the water released from the opening of the water conduit provided in the water storage tank increases in proportion to the height difference from the water source, the opening of the water conduit is opened with a stronger force. It is possible to provide a disk valve for an irrigation facility that can be blocked and can reliably block the opening of a water conduit.

  And since leakage from the opening of the water conduit after the blockage can be surely prevented, deformation of the disc valve itself and packing etc. can be eliminated by the pressure of the leakage water, and the leaked water can cause the float and float A load is not generated on the lever and valve rod that operate in conjunction with each other.

Furthermore, in irrigation disc valve device according to the present invention, by using two lever slave Organization, while being capable reliably close the opening of the water conduit are also irrigation disk downsized as further overall It can be a valve device.

Thereby, when installing and maintaining an irrigation facility, it is possible to easily carry and install the equipment that constitutes the disk valve to be installed, and to easily perform the work during maintenance. Furthermore, it is possible to increase the degree of freedom of the disk valve installation area and the installation location of the irrigation facility itself.

Longitudinal sectional view of the disk valve device for irrigation according to the present embodiment viewed from the lateral direction (A) is an AA arrow sectional view in the disk valve device for irrigation in FIG. 1, (B) a perspective side view showing a canopy member provided with an opening of a water conduit and a disk-shaped valve body, (C1) is ( B) CC main part perspective sectional view, (C2) is a top perspective view corresponding to (C1), (D1) is a DD direction main part perspective sectional view in (B), (D2) is ( D1) Top perspective view Fragmentary vertical cross-sectional view showing an enlarged second lever handset構近near The exploded view which shows the installation condition with respect to the canopy member of the disk-shaped valve body which obstruct | occludes the opening of a water conduit Longitudinal section showing the operating state of the irrigation disc valve device

Hereinafter, the irrigation disk valve device 10 according to the present embodiment will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an irrigation disk valve device 10 according to the present embodiment as viewed from the lateral direction, and FIG. 2A is a sectional view taken along line AA in the irrigation disk valve device 10 of FIG. And (B) is a perspective side view showing a canopy member provided with an opening 15 of a water conduit and a disc-like valve body (16), and (C1) is a perspective sectional view taken along a CC direction in (B). Yes, (C2) is a top perspective view corresponding to (C1), (D1) is a perspective sectional view in the DD direction in FIG. 2 (B), and (D2) corresponds to (D1). It is a top perspective view. Further, FIG. 3 is a fragmentary vertical cross-sectional view showing an enlarged second lever handset構近near, 4 for canopy member of the disk-shaped valve element which closes the opening 15 of the conduit (16) FIG. 5 is an exploded view showing an installation state, and FIG. 5 is a longitudinal sectional view showing an operating state of the irrigation disk valve device 10.

An irrigation disk valve device 10 according to this embodiment is installed in an irrigation water storage area such as a pond or a water storage tank, and as shown in FIG. 1, a float chamber 11 provided mainly in the water storage tank, , a float 12 provided in the float chamber 11, and two lever handset configuration to increase the buoyancy of the float 12 (13, 14), the opening 15 of the conduit opening into the water tank, the opening And a disc canopy 17 having a disc-like valve body (16) for opening and closing the disc.

  The float chamber 11 is formed in a cylindrical body that is open in the vertical direction, and the water level therein is configured to be the same as the water level in the water storage tank. In the present embodiment, a disk base 21 serving as a base is installed on the bottom surface of the water storage tank, and a plurality of column-shaped casing foots 22 are erected on the bottom, and a cylindrical shape is formed above the casing foot 22. A float chamber 11 is configured by installing a casing 18. In particular, since the casing 18 has a cylindrical shape, the lower part of the float chamber 11 defined inside the casing 18 is open. For this reason, the dust inside the chamber 11 (that is, the casing 18) is temporarily assumed. Even if it enters, it can be released without difficulty from below.

  In the float chamber 11 defined by the casing 18, a float 12 formed in a hollow shape is accommodated so as to be movable in the vertical direction. That is, the float 12 is configured to float on the water surface in the casing 18, and moves up and down in the casing 18 in conjunction with the rise or fall of the water level in the casing 18. The float 12 is provided with an adjustment plug 19 for adjusting buoyancy by injecting water or the like into the internal space or discharging water or the like. That is, in this embodiment, it is a hollow cylindrical float 12 whose upper and lower end portions are closed, and the upper buoyancy adjustment comprising an opening through which water can be injected into the float 12 and a member for closing the same on the upper surface. A plug 19 is provided, and a lower buoyancy adjustment plug 19 comprising an opening through which water injected into the float 12 can be discharged and a member for closing the water is provided on the lower surface of the float 12. In the float 12 formed as described above, when the buoyancy is reduced, water may be injected from the upper buoyancy adjustment plug 19 or the lower buoyancy adjustment plug 19. On the other hand, when increasing the buoyancy, for example, air can be injected from the upper buoyancy adjustment plug 19 and the water inside can be discharged from the lower buoyancy adjustment plug 19.

The buoyancy and the like of the float 12 is made to be conveyed to the lever slave Organization, in this embodiment, the lever slave Organization is classified into a first type lever for inputting force from the float 12 to the force point first an upper arm 13 constituting the lever slave Organization, lower arm 14 constituting the second lever handset structure classified to the two lever for inputting force acting point of the upper arm 13 to pivot It is made up of.

To enter the buoyancy or the like of the float 12 relative to the lever slave Organization of such a configuration, the arbor length, optionally between the force point of the upper arm 13 constituting the float 12 a first lever slave Organization A rod-shaped upper joint 23 formed so as to be adjustable is provided. That is, the upper joint 23 is pivotally attached to the upper surface of the float 12 at the proximal end side, and the distal end thereof is pivotally attached to the power point of the upper arm 13. In particular, in the present embodiment, in order to make it possible to arbitrarily adjust the axial center length of the upper joint 23, an expansion / contraction tube whose extension / contraction length can be adjusted by a screw or the like is used. By making the axial length of the upper joint 23 adjustable, for example, when a lot of irrigation water needs to be stored, the axial length of the upper joint 23 is shortened to reduce the amount of irrigation water stored. The axial center length of the upper joint 23 can be set long.

The upper arm 13 to which the buoyancy of the float 12 is input via the upper joint 23 is pivotally attached to the disk body 20 existing in the water storage tank, and swings around the pivoted portion as a fulcrum. It is configured as follows. The disc body 20 is provided at the upper end of a body foot 27 made of steel or the like standing on the disc base 21. When viewed from the side, the disc body 20 projects a portion that supports the upper arm 13 obliquely upward. And is bent so as to lack a lower part than the fulcrum of the upper arm 13, and a disc canopy 17 described later is arranged in this portion.

Further, the upper arm 13 is configured to increase the width of the fulcrum portion and gradually decrease the width toward the power point or the action point. By forming in this way, sufficient strength can be ensured and the weight can be reduced as much as possible. As shown in FIG. 2, two upper arms 13 can be used in parallel.
As described above, an action point that swings up and down around the fulcrum by the operation of the float 12 is provided on the distal end side of the upper arm 13 that is pivotally attached to the disc body 20. A lower joint 24 extending downward is pivotally attached to this action point. Particularly in the present embodiment, the upper arm 13 is set such that the distance from the fulcrum to the force point is four times the distance from the fulcrum to the action point. As a result, a force four times the force point is generated at the action point.

The lower end of the Lower joints 24 provided at the point of application of the upper arm 13 is pivotally attached to the force point of the lower arm 14 constituting the second lever slave Organization. As shown in FIG. 3, the fulcrum of the lower arm 14 is pivotally attached to the disk body 20, and the action point is provided near the fulcrum. In this embodiment, since the distance from the fulcrum to the force point is set to about 3.2 times the distance from the fulcrum to the action point, the force is about 3.2 times the force input to the force point. Can be output to the point of action. As a result, it is possible to output a point of action of the second lever slave Organization to increase the buoyancy of the float 12 to about 12.8 times. Incidentally, Lower joints 24 connecting the force point of the lower arm 14 constituting the second lever slave Organization and the action point of the upper arm 13 constituting the first lever slave Organization, as with the upper joint 23 axis In order to make it possible to adjust the length of the core arbitrarily, a telescopic tube whose length of expansion and contraction can be adjusted with screws is used.

The lower arm 14 is configured such that when the force point is in the center (D / 2) of the swing range (D) of the action point, the force point is on the same plane as the fulcrum. Particularly in the present embodiment, in a state where the lower arm 14 is inclined most downward, that is, in a state where the force point is on the same plane as the fulcrum, the action point is lower than the imaginary line (L) connecting the fulcrum and the force point. Is provided. With this configuration, it is possible to minimize the horizontal displacement of the working point during the swinging of the lower arm 14 constituting the second lever slave Organization. In addition, in the state where the lower arm 14 is located at the lowest position, the force point exists on the same horizontal plane as the fulcrum, so that the upward force from the upper arm 13 can be used to the maximum and guided by a stronger force. The opening 15 of the water pipe can be closed.

  The lower arm 14 is configured such that two lower arms 14 are arranged in parallel to form a pair, and a disk joint 25 formed in a shaft shape is attached to an operating point of each lower arm 14. ing. The tip of the disk joint 25 is connected to an umbrella-shaped disk canopy 17. With this configuration, the disc canopy 17 can move up and down in accordance with the swing of the lower arm 14.

In particular, in the present embodiment, as shown in FIG. 1, a nozzle member 28 composed of a pipe having substantially the same inner diameter as the delivery pipe 26 is connected to the opening of the delivery pipe 26 that guides irrigation water into the water storage tank. The opening of the nozzle member 28 connected to the pipe 26 is used as the opening 15 of the water conduit. Note that the delivery tube 26 and the nozzle member 28 is integrated by a flange provided on the respective bonding surfaces, the nozzle member 28. It is pivotally attached to the disc body 20 by a flange 33 protruding from the side surface. It is also desirable to provide a speed reduction ring 42 with a narrowed inner diameter in order to reduce the pressure of irrigation water guided from the delivery pipe 26 at the lower end side of the nozzle member 28 .

As shown in FIGS. 2 and 4, a disk guide 31 is provided on the side surface of the nozzle member 28 to guide the vertical movement of the disk joint 25 and eliminate the displacement in the horizontal direction. In the present embodiment, it is embodied as a groove-shaped guide that supports the plate member that is provided protruding from the disk joint 25 so as to sandwich the plate member. Further, such a disk guide 31 can be provided not only at the position where the disk joint 25 exists but also at other positions at predetermined intervals. When the disk guide 31 is provided at another position, a plate member 39 protruding toward the center is provided inside the umbrella-shaped disk canopy 17 that moves up and down by the disk joint 25, and the plate member 39 is guided. It can be constituted as follows. By providing the plurality of disc guides 31 as described above, the disc canopy 17 can be moved up and down in the vertical direction.

  A disk member 16 serving as a valve body (16) for closing the opening 15 of the water conduit is installed on the lower surface of the disk canopy 17. In this embodiment, the disk member 16 is attached to the disk canopy 17 in a swingable state. In particular, the disk member 16 is fixed to the disk canopy 17 by a split pin, and the surface on which the lower arm 14 swings. It is attached so that it can swing in a direction orthogonal to the direction.

  As shown in FIG. 4, the disc member 16 is fixed to the disc canopy 17 by welding or the like, and has a disc cap 34 having a bearing portion provided with a drill hole below, and a split pin on the bearing portion. A disc main body 36 comprising a projection portion fixed by a shaft 35 and the like, and a disc portion provided below the projection portion, a disc packing 37 covering the side and bottom surfaces of the disc portion of the disc main body 36, and the disc It can be configured with a packing presser 38 having a flange portion for holding the packing and having a pin fitted to the disc body.

The operation of the irrigation disk valve device 10 configured as described above will be described with reference to FIG. 5. When the water level in the water tank rises (HWL), the float 12 also moves in the casing 18 together with this. To rise. The buoyancy of the float 12 is input to the power point of the upper arm 13 via the upper joint 23 and pushes up the power point. Along with this, a downward force is generated at the action point of the upper arm 13, and this pushes down the force point of the lower arm 14 via the lower joint 24. The Lower joint 24 since it is composed of a second kind of lever sub Organization, the working point around the fulcrum acts downward force, thereby, a disk provided Re此and disk canopy 17 The main body can be pulled down to close the opening 15 of the water conduit.

  On the other hand, when the irrigation water in the water tank does not reach a certain water level, the float 12 is also present at a low position, and the upper arm 13 is also present at a position where the power point is lower than the fulcrum. At this time, the action point of the upper arm 13 exists at a position higher than the fulcrum, and the power point of the lower arm 14 is pulled up via the lower joint 24. As a result, the operating point of the lower arm 14 is also pushed upward, the disk canopy 17 and the disk member 16 provided therethrough are also pushed up via the disk joint 25, and the opening 15 of the water conduit is opened. In the irrigation disk valve device 10 according to the present embodiment, the upper arm 13 at the low water level (LWL) is provided in the disk body 20 in order to adjust the inclination of the upper arm 13 at this time to a certain range. Is provided with a low water level stopper 30.

Then, the irrigation disk valve device 10 in the present embodiment, the force point of the upper arm 13 is first kind lever slave Organization fulcrum, the opposite direction to the arrangement direction of the point, the second kind lever slave Organization The force point, the action point, and the fulcrum of the lower arm 14 are arranged in this order. This makes it possible to reduce the overall length of the two lever handset structure, it is possible to reduce the size of the irrigation disc valve device 10. Particularly in this embodiment, by being arranged two levers handset configuration as described above, the point of lower arm 14 is comprised to be present under the fulcrum of the upper arm 13, the As described above, since the disk body 20 is provided with the recess for accommodating the disk canopy 17, the disk canopy can be raised and lowered without difficulty.

  The disk valve device for irrigation of the present invention can be used in irrigation facilities in the agricultural field, and in addition to water and sewage management facilities, liquid fuel storage facilities, and liquid storage facilities in various factories, It can be used as a valve for storing a certain amount.

Therefore, the disk valve device for irrigation according to the present invention can be used not only for irrigation facilities but also for various applications.

10 Disc valve device for irrigation 11 Float chamber 12 Float 13 Upper arm 14 Lower arm 15 Conduit opening 16 Disc member 17 Disc canopy 18 Casing 19 Adjustment plug 20 Disc body 21 Disc base 22 Casing foot 23 Upper joint 24 Lower joint 25 Disc Joint 26 Delivery tube
28 nozzle member
27 body foot

Claims (5)

The opening of the water conduit provided in the irrigation water storage area such as a pond or a water tank is opened and closed by a disc-shaped valve body that operates in conjunction with the vertical movement of the float in the float chamber provided in the water tank. An irrigation disc valve device,
Float buoyancy, to convert to the opening and closing forces for opening and closing the opening of the aqueduct, comprise two or more levers handset structure constituted by an arm member that swings about a fulcrum,
The two or more lever mechanisms are composed of a first lever mechanism that inputs float buoyancy as a force point and a second lever mechanism that inputs a force at an action point in the first lever mechanism,
The disc-shaped valve body is provided at the center of the bottom surface of the canopy member formed in an umbrella shape,
The opening and closing force of the valve body is increased by the two or more lever mechanisms, and distributed and input to two or more locations of the canopy member,
The valve body is characterized in that for opening and closing the opening of the conduit in the opening and closing force of the acting point of increased size has been the second lever mechanism, irrigation disk valve device.
The power point of the second lever mechanism is installed below the operating point in the first lever mechanism, and the operating point and fulcrum of the second lever mechanism are installed on the fulcrum side of the first lever mechanism. Tei Ru, irrigation disk valve device according to claim 1.
The working point of the second lever slave Organization has its vertical center position of the rotation range is set to lie on the horizontal surface of the second supporting point of leverage slave Organization, according to claim 2 Disc valve device for irrigation.
The first lever mechanism is a first-type lever, and the distance from the fulcrum to the action point is more than twice the distance from the viewpoint to the force point,
The second lever mechanism is a second-type lever, and the distance from the fulcrum to the force point is at least twice as long as the distance from the fulcrum to the action point . Disc valve device for irrigation.
The two or more lever handset structure includes a first lever slave Organization for inputting the buoyancy of the float to the force point, a second leverage slave unit to enter a force at the working point in the first lever slave Organization Consists of
The second lever slave Organization is present under the canopy member formed like an umbrella disk-shaped valve body is provided, pulling downward the disk-shaped valve body provided in the canopy member, wherein Item 5. The disk valve device for irrigation according to any one of Items 1 to 4.