Check valve and its manufacturing method

Abstract

To provide a check valve capable of preventing paint from peeling off and replacing a stopper easily.SOLUTION: A check valve 10 comprises: a valve box 11 with flanges 11a, 11b for connecting to water pipes; a valve body 12 housed in the valve box 11; an arm 14 to which the valve body 12 is connected by bolts; a rotational shaft 15 penetrating the arm 14; a pin 16 penetrating the arm 14 and the rotational shaft 15; and a bearing 17 supporting the rotational shaft 15. The arm 14 has a stopper plate 18a, and the stopper plate 18a has a holding hole 20a for holding a stopper 19a. The valve box 11 has a stopper plate 18b, and the stopper plate 18b has a holding hole 20b for holding a stopper 19b.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a check valve and a method for manufacturing the same. [Background technology]

[0002] Swing-type check valves that are connected to water pipes have been known for some time (see, for example, Patent Document 1). The check valve in Patent Document 1 includes a valve box having an upstream flange and a downstream flange necessary for connection to a water pipe, a valve body stored in the valve box, and a rotating shaft that rotatably supports the valve body, and the valve box has an opening through which tap water passes when it flows from the upstream flange to the downstream flange.

[0003] When the water pressure of the tap water flowing from the upstream flange to the downstream flange is lower than a predetermined pressure, the valve disc abuts against the valve body to close the opening, and the tap water is stopped by the valve disc. On the other hand, when the water pressure of the tap water flowing from the upstream flange to the downstream flange is higher than a predetermined pressure, the valve disc separates from the valve body to open the opening, and the tap water passes through the check valve.

[0004] On the other hand, the valve disc may suddenly open its opening due to the high water pressure of tap water flowing from the upstream flange to the downstream flange, causing a strong impact on the valve box, which may damage the valve box. In response to this, the check valve in Patent Document 1 is equipped with a stopper on the valve box, and even if the valve disc suddenly opens its opening and causes a strong impact on the valve box, the stopper absorbs the impact, preventing the valve box from being damaged by a direct impact.

[0005] When the stopper is molded integrally with the valve body, the surface of the stopper is usually coated with an anti-rust paint. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2015-190485 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, when the valve disc repeatedly hits the stopper, the paint on the surface of the stopper peels off, causing problems such as the paint becoming contaminated as dust in the tap water. In addition, if the stopper is damaged by the repeated collision of the valve disc with the stopper, the stopper cannot be replaced alone because it is molded integrally with the valve body, and the valve body must be replaced.

[0008] In order to replace the check valve body, the check valve must be removed from the water pipe, and the removal of the check valve is carried out after an alternative route for tap water has been secured to avoid a water outage. In other words, the check valve body is replaced with a new valve body after the check valve is removed from the water pipe, which poses the problem of an extremely large workload in replacing the check valve body.

[0009] That is, the conventional check valve has a problem in that it is difficult to prevent the paint from peeling off and the stopper cannot be easily replaced.

[0010] An object of the present invention is to provide a check valve which prevents paint from peeling off and enables a stopper to be easily replaced, and a method for manufacturing the same. [Means for solving the problem]

[0011] In order to achieve the above object, the check valve according to claim 1 comprises a valve body connected to a pipeline through which a fluid flows and having a flow path for the fluid, a valve element which rotates to open and close an opening of the flow path, a first restricting means for restricting the rotation of the valve element, a first mounting means in which the first restricting means is mounted, a second restricting means against which the valve element rotates and against which the first restricting means collides, and a second mounting means in which the second restricting means is mounted, wherein the first mounting means has a first retaining means for retaining the first restricting means, the second mounting means has a second retaining means for retaining the second restricting means, and the first restricting means and the second restricting means are formed of a material including stainless steel. The first retaining means is a first retaining hole that retains the first restricting means, the second retaining means is a second retaining hole that retains the second restricting means, the first restricting means and the second restricting means are bolts, the first retaining hole and the second retaining hole are bolt holes corresponding to the bolts, and the bolts are screwed into the bolt holes.It is characterized by the fact that

[0012] In order to achieve the above object, claims 5 a valve body connected to a pipeline through which a fluid flows and having a flow path for the fluid; a valve body that rotates to open and close an opening of the flow path; a first restricting means that restricts the rotation of the valve body; a first arrangement means in which the first restricting means is arranged; a second restricting means against which the valve body rotates and against which the first restricting means collides; and a second arrangement means in which the second restricting means is arranged, wherein the first arrangement means has a first retaining means that retains the first restricting means, and the second arrangement means has a second retaining means that retains the second restricting means, the first restricting means and the second restricting means are made of a material including stainless steel, the first retaining means is a first retaining hole that retains the first restricting means, the second retaining means is a second retaining hole that retains the second restricting means, the first restricting means and the second restricting means are bolts, the first retaining hole and the second retaining hole are bolt holes corresponding to the bolts, and the bolts are screwed into the bolt holes, The manufacturing method includes: First arrest hole and the second restricting means is attached to the Second arrest hole The present invention is characterized in that it has a mounting step for mounting the device to the Effect of the Invention

[0013] According to the present invention, peeling of paint can be prevented and the stopper can be easily replaced. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing an outline of the internal structure of a check valve according to an embodiment of the present invention, illustrating the check valve with the valve body in a fully closed state. [Diagram 2] FIG. 2 is an enlarged view of the stopper periphery in FIG. [Diagram 3] 2 is a diagram showing the check valve in FIG. 1 with the valve body in a fully open state. [Figure 4] FIG. 4 is an enlarged view of the stopper periphery in FIG. [Diagram 5] FIG. 2 is a diagram illustrating a modification of the check valve of FIG. 1. [Figure 6] 2 is a flowchart showing the steps of a method for manufacturing the check valve of FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0016] 1 to 4 are diagrams used to explain the internal structure of a check valve 10 according to an embodiment of the present invention. FIG. 1 is a diagram showing the internal structure of the check valve 10, and shows the check valve 10 with the valve body 12 in a fully closed state. FIG. 2 is an enlarged view of the area around stoppers 19a and 19b in FIG. 1. FIG. 3 is a diagram showing the check valve 10 with the valve body 12 in a fully open state in FIG. 1. FIG. 4 is an enlarged view of the area around stoppers 19a and 19b in FIG. 3.

[0017] The check valve 10 in FIG. 1 includes a valve box 11 having flanges 11a and 11b for connection to a water pipe (pipeline), a valve element 12 stored in the valve box 11, a cover 13 attached to the valve box 11, an arm 14 (connection means) to which the valve element 12 is connected by a bolt, a rotating shaft 15 penetrating the arm 14, a pin 16 penetrating the arm 14 and the rotating shaft 15, and a bearing 17 for rotatably supporting the rotating shaft 15. The valve box 11 has an inflow passage 11c through which tap water (fluid) flows from the water pipe into the inside of the valve box 11, an outflow passage 11d through which the tap water flowing in from the inflow passage 11c flows out, an opening 11e which is one end of the inflow passage 11c, and an internal flow passage 11f which is a flow passage for tap water between the inflow passage 11c and the outflow passage 11d. The valve element 12, the arm 14, and the rotating shaft 15 rotate together around the rotating shaft 15 to open and close the opening 11e.

[0018] When the pressure of tap water flowing from the water pipe into the inlet passage 11c is lower than a predetermined pressure, the valve body 12 closes the opening 11e (fully closed state, Figs. 1 and 2). Therefore, at this time, the tap water does not enter the internal flow path 11f and the outlet passage 11d. On the other hand, when the pressure of tap water flowing from the water pipe into the inlet passage 11c is higher than a predetermined pressure, the valve body 12 opens the opening 11e. Therefore, at this time, the tap water sequentially enters the internal flow path 11f and the outlet passage 11d, and flows out from the outlet passage 11d into the water pipe.

[0019] The valve element 12 rotates together with the arm 14 and the rotating shaft 15 to open the opening 11e, but when the pressure of tap water flowing from the water pipe into the inflow passage 11c is very high, it rotates suddenly to open the opening 11e. If the valve element 12 collides with the valve box 11 and the valve box 11 or the valve element 12 is damaged, the valve box 11 or the valve element 12 must be replaced, which is economically and laborious. Therefore, in order to prevent the valve element 12 from rotating suddenly to open the opening 11e and directly colliding with the valve box 11, the check valve 10 is provided with stopper plates 18a, 18b (first arrangement means, second arrangement means), and the stopper plates 18a, 18b have retaining holes 20a, 20b (first retaining means, second retaining means, first retaining hole, second retaining hole) for retaining the stoppers 19a, 19b (first regulating means, second regulating means).

[0020] In this embodiment, the stopper plate 18a and the stopper 19a are disposed on the arm 14, and the stopper plate 18b and the stopper 19b are disposed on the valve box 11. When the valve element 12 rotates suddenly to open the opening 11e, the stopper 19a collides with the stopper 19b and the rotation of the valve element 12 is restricted, thereby preventing the valve element 12 from directly colliding with the valve box 11 and damaging the valve box 11 or the valve element 12. When the rotation of the valve element 12 is restricted by the stoppers 19a and 19b, the valve element 12 opens the opening 11e to the maximum (fully open state, Figures 3 and 4).

[0021] For the stoppers 19a and 19b, for example, hexagonal bolts made of stainless steel (including stainless steel; the same applies below), titanium, or resin, which have excellent corrosion resistance, are used, and bolt holes corresponding to the hexagonal bolts are formed as retaining holes 20a and 20b in the stopper plates 18a and 18b, and the hexagonal bolts are screwed into the bolt holes. Therefore, the threaded parts of the hexagonal bolts are retained in the retaining holes 20a and 20b, and the heads of the hexagonal bolts function as the stoppers 19a and 19b. Specifically, when the valve body 12 is in a fully open state, the head of the hexagonal bolt serving as the stopper 19a provided on the arm 14 abuts against the head of the hexagonal bolt serving as the stopper 19b (FIG. 4).

[0022] The arrangement of the stoppers 19a and 19b is not particularly limited as long as the valve body 12 opens the opening 11e, the stoppers 19a and 19b come into contact with each other, and the valve body 12 does not come into contact with the valve box 11. For example, the arrangement of the stopper 19a may be unchanged, and only the arrangement of the stopper 19b may be changed from the valve box 11 to the cover body 13 (check valve 50 in FIG. 5). In this case, too, when the valve body 12 is in the fully open state, the head of the hexagonal bolt serving as the stopper 19a comes into contact with the head of the hexagonal bolt serving as the stopper 19b. Furthermore, the shape of the stoppers 19a and 19b is not particularly limited as long as the stoppers 19a and 19b come into contact with each other and the valve body 12 does not come into contact with the valve box 11.

[0023] According to the check valve 10 of Fig. 1, the stoppers 19a, 19b are made of, for example, hexagonal bolts made of stainless steel, titanium, or resin, which have excellent corrosion resistance. Since the hexagonal bolts are resistant to rust, there is no need to apply anti-rust paint to the stoppers 19a, 19b. Therefore, even if the stoppers 19a, 19b repeatedly collide with each other, the paint will not peel off and fall into the tap water, and it is possible to prevent the paint from peeling off and falling into the tap water.

[0024] The stoppers 19a, 19b are held in the holding holes 20a, 20b formed in the stopper plates 18a, 18b. If the stoppers 19a, 19b are made of, for example, stainless steel, titanium, or resin hexagonal bolts having excellent corrosion resistance, and the holding holes 20a, 20b formed in the stopper plates 18a, 18b are bolt holes corresponding to the hexagonal bolts, the stoppers 19a, 19b can be easily replaced, and there is no need to replace the valve box 11. Therefore, even if the stoppers 19a, 19b are damaged or deteriorated, the stoppers 19a, 19b can be easily replaced without requiring extensive work to replace the valve box 11.

[0025] Fig. 6 is a flowchart showing the steps of a method for manufacturing the check valve 10 of Fig. 1. In the method for manufacturing the check valve 10 of Fig. 6, it is assumed that rust-resistant stainless steel hexagonal bolts are used as the stoppers 19a, 19b, and that the retaining holes formed in each of the stopper plates 18a, 18b are bolt holes corresponding to the stainless steel hexagonal bolts used as the stoppers 19a, 19b.

[0026] 6, first, the components of the check valve 10, specifically, the valve box 11 to which the bearing 17 and the stopper plates 18a, 18b are attached, the valve body 12, the cover 13, the arm 14, the rotating shaft 15, the pin 16, and the stoppers 19a, 19b are prepared (S61), and the valve body 12 is fixed to the arm 14 with a bolt, and the rotating shaft 15 passes through the arm 14 (S62). The rotating shaft 15, which passes through the arm 14 to which the valve body 12 is fixed, is supported by the bearing 17, and the pin 16 passes through the arm 14 and the rotating shaft 15 to fix the arm 14 and the rotating shaft 15 (S63). In this embodiment, the rotating shaft 15 is supported by two bearings 17, and the pin 16 passes through the arm 14 and the rotating shaft 15 at the middle between the two bearings 17.

[0027] Next, the stopper plates 18a, 18b are formed with the retaining holes 20a, 20b for attaching the stoppers 19a, 19b (S64, forming step), and the stainless steel hexagonal bolts serving as the stoppers 19a, 19b are screwed into the bolt holes serving as the retaining holes 20a, 20b (S65, mounting step). Finally, the cover 13 is fixed to the valve box 11 with bolts (S66), and the check valve 10 is completed.

[0028] According to the manufacturing method of the check valve 10 of Fig. 6, the retaining holes 20a, 20b for attaching the stoppers 19a, 19b are formed in the stopper plates 18a, 18b (S64), and the stainless steel hexagonal bolts serving as the stoppers 19a, 19b are screwed into the bolt holes serving as the retaining holes 20a, 20b (S65), so that the stoppers 19a, 19b can be easily formed. At this time, since the stainless steel hexagonal bolts serving as the stoppers 19a, 19b are screwed into the retaining holes 20a, 20b (S65), even if the stoppers 19a, 19b are damaged or deteriorated, the stoppers 19a, 19b can be easily replaced.

[0029] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. [Explanation of symbols]

[0030] 10. Check valve 11 Valve box 11e aperture 12 Valve body 14 Arm 15 Rotational Axis 18a, 18b Stopper plate 19a, 19b Stopper 20a,20b Retention hole

Claims

1. a valve body connected to a pipeline through which a fluid flows and having a flow path for the fluid; a valve body that rotates to open and close an opening of the flow path; a first restricting means for restricting rotation of the valve body; a first mounting means in which the first restricting means is mounted; a second restricting means against which the valve body rotates and the first restricting means collide; and a second arrangement means in which the second restriction means is arranged, the first arrangement means has a first holding means for holding the first regulating means, the second arrangement means has a second holding means for holding the second regulating means, the first restriction means and the second restriction means are formed of a material including stainless steel, The first retaining means is a first retaining hole that retains the first restricting means, and the second retaining means is a second retaining hole that retains the second restricting means, A check valve characterized in that the first regulating means and the second regulating means are bolts, the first retaining hole and the second retaining hole are bolt holes corresponding to the bolts, and the bolts are screwed into the bolt holes.

2. a rotation axis when the valve body rotates; a connecting means for connecting the valve body and the rotating shaft; 2. The check valve of claim 1, further comprising:

3. 3. The check valve according to claim 2, wherein the first restricting means and the first arranging means are provided in the connecting means, and the second restricting means and the second arranging means are provided in the valve body.

4. 4. The check valve according to claim 1, wherein the second mounting means is a stopper plate attached to the valve body.

5. A method for manufacturing a check valve comprising: a valve body connected to a pipeline through which a fluid flows, and having a flow path for the fluid; a valve disc which rotates to open and close an opening of the flow path; first regulating means for regulating rotation of the valve disc; first mounting means on which the first regulating means is mounted; second regulating means against which the valve disc rotates and against which the first regulating means collides; and second mounting means on which the second regulating means is mounted, wherein the first mounting means has first retaining means for retaining the first regulating means, and the second mounting means has second retaining means for retaining the second regulating means, the first restriction means and the second restriction means are formed of a material including stainless steel, The first retaining means is a first retaining hole that retains the first restricting means, and the second retaining means is a second retaining hole that retains the second restricting means, the first restricting means and the second restricting means are bolts, the first retaining hole and the second retaining hole are bolt holes corresponding to the bolts, and the bolts are screwed into the bolt holes; The manufacturing method of a check valve is characterized in that it includes an attachment step of attaching the first regulating means to the first restraining hole and attaching the second regulating means to the second restraining hole.

6. 6. The method for manufacturing a check valve according to claim 5, further comprising a forming step of forming the first retaining hole in the first mounting means and forming the second retaining hole in the second mounting means prior to the mounting step.

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