KR102102563B1 - Valve with corrosion and rust prevetnion structure - Google Patents

Abstract

According to the present invention, a valve comprises: a valve body installed in a pipe; a disk rotatably installed in the valve body to open and close a flow path of the valve body; a corrosion prevention film covering the surface of the disk to prevent corrosion of the disk; a shaft coupled to the disk by penetrating the valve body to apply torque to the disk; a disk pin connected to at least a portion of the disk by penetrating the shaft; and a shaft fixing unit protruding from the disk and allowing the shaft and the disk pin to be inserted thereinto in directions perpendicular to each other. The shaft fixing unit includes: an insertion hole allowing the shaft to be inserted thereinto, wherein at least a portion thereof is not coated with the corrosion prevention film; a first O-ring unit arranged on the insertion hole to enclose the shaft to prevent corrosion on the inner circumferential surface of the insertion hole; a pin hole penetrating the outer surface of the shaft fixing unit to be formed in a direction perpendicular to the insertion hole to allow the disk pin to be inserted thereinto; and a second O-ring unit arranged on the pin hole to enclose the disk pin to prevent corrosion on the inner circumferential surface of the pin hole.

Description

Valve with corrosion and rust prevention structure {VALVE WITH CORROSION AND RUST PREVETNION STRUCTURE}

The present invention relates to a valve, and more specifically, to a valve that is installed in the piping to open and close the flow path.

In general, a valve is a device that is installed on a portion of a pipe formed by a pipe or the like forming a passage for a fluid to stop the flow of fluid or to control the flow of fluid to be maintained.

Among these valves, the butterfly valve or the ball valve is configured to open and close the pipeline according to the rotation of the disc installed inside the valve body. For example, a disk is rotatably installed in a valve body connected to the shaft and connected to the shaft, and rotated by a driving device connected to the shaft to open and close the pipe. In addition, the gate valve is a valve in which the disc of the valve moves up and down to open and close the flow path in the vertical direction.

These valves are compressed to each other when they are closed on the inner circumferential surface of the valve body and the outer circumferential surface of the disc, thereby blocking leakage. Specifically, a watertight device (sealing unit, seat ring) is arranged to block the gastric clearance in order to prevent the fluid from leaking into the clearance between the disk and the body of the valve while the flow of fluid is stopped.

On the other hand, corrosion occurs when the surface of the valve comes into contact with the fluid, whereby rust may occur. In particular, since the fluid does not flow in a closed state, a strong water pressure is applied to the disk. In addition, due to this, fluid flows into the connecting portion of the disc and the shaft, and there is a possibility that corrosion occurs in the connecting portion.

In particular, after a hole is made in the disc, a method of combining the disc and the shaft using a shaft and a pin may be used in the connection portion of these valves, but there is a problem in that corrosion is vulnerable.

In the way that the disk pin is not used, it is also possible to process the end of the shaft into a square as shown in Registered Utility Model No. 20-0457200 (announced on December 08, 2011) and join it to the square groove of the disk. It also has a difficult problem with solid coupling.

Accordingly, the present invention proposes a new mechanism that can solve the various problems described above.

The first object of the present invention is to provide a valve capable of preventing corrosion while the disc and the shaft are correctly combined.

The second object of the present invention is to provide a disk fastening structure of a valve that does not generate rust even after a long period of use.

In order to achieve the problems of the present invention, a shaft and a disc pin are disposed on one side of a disc coated with an anti-corrosion film, and a valve capable of preventing corrosion and rust is prevented by using a structure for sealing the holes for assembling and cutting. Implement

More specifically, the valve includes a valve body installed in a pipeline, a disk rotatably installed inside the valve body to open and close the flow path of the valve body, and a surface of the disk to prevent corrosion of the disk A corrosion preventing film covering the shaft, a shaft that penetrates the valve body and engages the disc to apply rotational force to the disc, a disc pin that penetrates the shaft and is connected to at least a portion of the disc, and protrudes from the disc , The shaft and the disk pin includes a shaft fixing portion formed to be inserted in a direction perpendicular to each other, the shaft fixing portion, the shaft is inserted, at least a portion of the insertion hole is not coated with the corrosion prevention film, the insertion It is arranged in the insertion hole to prevent corrosion on the inner circumferential surface of the hole and surrounds the shaft The first O-ring portion, a pinhole formed in a direction perpendicular to the insertion hole through the outer surface of the shaft fixing portion so that the disk pin is inserted, and is disposed in the pinhole to prevent corrosion on the inner peripheral surface of the pinhole And a second O-ring part surrounding the disk pin.

In one embodiment of the present invention, the pinhole is formed to penetrate the shaft fixing portion by cutting, so that the corrosion preventing film is not applied to the inner peripheral surface of the pinhole. The shaft fixing part protrudes from one surface of the disk, and the insertion hole and the pin hole may be formed parallel to one surface of the disk in a direction perpendicular to each other. The disk pin and the pinhole may be disposed in a direction perpendicular to the flow path while the flow path of the valve body is closed.

In another embodiment of the present invention, the first O-ring portion is provided with O-rings respectively disposed at both ends of the insertion hole. The shaft fixing part has the insertion hole, and has a boss protruding from one surface of the disk, and the pin hole is provided with the first part of the boss, the shaft and the second part of the boss along the longitudinal direction of the disk pin. The second O-ring portion may be formed to pass through in turn, and may have an O-ring disposed in the first pin hole of the first portion and the second pin hole of the second portion, respectively.

In another embodiment of the present invention, the valve body faces the shaft fixing portion and a shaft through portion into which the shaft is inserted is formed, and the shaft through portion has an O-ring surrounding the shaft. A circumferential protrusion protrudes from an inner circumferential surface of the shaft through portion to form a stepped jaw in the opening of the shaft through portion, and an O-ring surrounding the shaft may be caught in the circumferential protrusion.

In another embodiment of the present invention, the anti-corrosion film is formed of a polyurethane composition, the polyurethane composition, a prepolymer prepared by the reaction of isocyanate and alkoxysilane, and acrylic acid 2-hydroxyethyl ester, acrylic acid 2- And at least one selected from the group consisting of hydroxyethyl ether, acrylic acid 2-hydroxypropyl ester, acrylic acid 2-hydroxypropyl ether, ethylene glycol methyl ether acrylate, ethylene glycol ethyl ether acrylate, and grisidyl methacrylate. .

In addition, the present invention, the valve body is installed in the pipeline, the disk is rotatably installed inside the valve body, to open and close the flow path of the valve body, and to cover the surface of the disk to prevent corrosion of the disk , A corrosion-prevention film formed of a polyurethane composition, a shaft that penetrates the valve body and engages the disc to apply a rotational force to the disc, a disc pin that penetrates the shaft and is connected to at least a portion of the disc, and And a shaft fixing part having an insertion hole formed on one surface of the shaft fixing part so that the shaft is inserted, and a pin hole formed in a direction perpendicular to the insertion hole on the other surface of the shaft fixing part so that the disk pin is inserted. , The insertion hole and the pin hole are cut by after the anti-corrosion film is applied to cover the disk. It is formed by, and to provide a valve characterized in that the O-ring is fitted to the shaft and the disc to be placed in the opening of the insertion hole and the pinhole so as to limit the fluid flowing into the insertion hole and the pinhole.

The effects of the present invention obtained through the above-described solution are as follows.

First, the present invention applies a sealing structure to the processed structure after painting the anti-corrosion film, so that the part in contact with the fluid is an anti-corrosion film, and the other parts are prevented from corrosion by a sealing structure. Therefore, a new type of valve prevents corrosion and rust prevention.

Second, as described above, since the insertion hole and the pin hole can be processed during the valve installation process, corrosion can be prevented, and a complicated structure or manufacturing process is not required for this.

Third, by using a structure in which the shaft and the disk pin are disposed on one side of the disk, the present invention is a mechanism in which the hydraulic pressure is not pressurized to the sealing structure in the closed state, and a strong force is not applied in the shear direction of the disk pin in the open state. Implement Using this mechanism, a valve that is resistant to corrosion and can be prepared for shear failure of the disc pin can be implemented.

Fourth, in particular, by coating a corrosion-resistant film with a polyurethane composition having a new composition resistant to corrosion, rust can be prevented even when the valve is used for a long time.

1 is a front view of a valve having a corrosion and rust prevention structure according to an embodiment of the present invention.
Figure 2 is a cross-sectional view taken along the AB cross-section of the butterfly valve of Figure 1;
Figure 3 is a cross-sectional view taken along the CD cross-section of the butterfly valve of Figure 1;
4 is an enlarged view of part E of FIG. 2.
5 is an enlarged view of part F of FIG. 3.
6 is a front view of a valve having a corrosion and rust prevention structure according to another embodiment of the present invention.
7 is a cross-sectional view taken along the AB section of the ball valve of FIG. 6;
8 is a cross-sectional view of the shaft fixing portion of the ball valve of FIG. 6 viewed in the CD direction.
9 is an enlarged view of a portion G of FIG. 7.

Hereinafter, a valve having a corrosion and rust prevention structure related to the present invention will be described in detail with reference to the drawings. In the present specification, the same or similar reference numerals are assigned to the same or similar configurations in different embodiments, and the description is replaced with the first description.

In the following description of the present invention, when it is determined that a detailed description of known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. Throughout the specification, when a part “includes” a certain component, it means that the component may further include other components, not exclude other components, unless specifically stated otherwise. Terms such as "... part" and "... module" mean a unit that processes at least one function or operation.

The singular expression used in this specification includes the plural expression unless the context clearly indicates otherwise.

1 is a front view of a valve having a corrosion and rust prevention structure according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the AB cross-section of the butterfly valve of FIG. 1, and FIG. 3 is a butterfly valve of FIG. 1 It is a cross-sectional view taken along the CD cross-section, and these drawings show the closed state of the valve.

Referring to these drawings, the valve may be a butterfly valve. The present invention is not limited to butterfly valves, but is applicable to all types of valves, such as ball valves and check valves, in which a disc is coupled to a shaft. However, for convenience of description, the butterfly valve will be described as an example in this embodiment.

The butterfly valve 100 includes a valve body 110 having a flow path at which both ends are opened, and a disk 120 that opens and closes the flow path of the valve body 110.

The valve body 110 is made of a metal material and is formed in a substantially cylindrical shape. The inner space 111 formed inside the valve body 110 forms a flow path through which the fluid flows. That is, the valve body 110 is formed to have an inner space 111 at which both ends are open. Both ends of the valve body 110 are connected to a pipe (or pipe), and both ends of the valve body 110 are opened to continuously extend the flow path without breaking. That is, the valve body is installed in the pipeline to perform the function of opening and closing the pipeline.

In this case, a fastening hole (not shown) for fastening with the pipe may be formed on the flange of the valve body 110. In addition, a support for supporting the body 110 may be installed under the valve body 110 when mounted on a flat surface.

In the inner space 111 of the valve body 110, a disk 120 capable of opening and closing the flow path of the valve body is installed.

The disk 120 is rotatably mounted inside the valve body 110 to open and close the flow path. That is, the disk 120 is opened in a state in which the flow path is closed as described in FIGS. 1 and 2 (hereinafter referred to as a closed state) while rotating relative to the shaft 130 to be described later (hereinafter, It is said to be open). In order to fully open the flow path, the disk 120 must be rotated approximately 90 degrees from the closed state along the rotation path.

Butterfly valve 100 according to an embodiment of the present invention is mounted on the inner circumferential surface of the valve body 110 forming the inner space 111 between the disk 120 and the inner circumferential surface of the valve body 110 It may further include a sealing member (seat ring) formed to seal.

More specifically, the sealing member (not shown) is disposed on the inner circumferential side of the valve body 110 while being in contact with the disk 120 in a state where the flow path is blocked. Accordingly, it is possible to prevent or alleviate the leakage of fluid through the gap between the valve body 110 and the disc 120.

In addition, at least a portion of the sealing member may be made of an elastic material, for example, may be made of a rubber or urethane material exhibiting elasticity.

Referring to this drawing, the disk 120 includes a shaft fixing portion 123, and a shaft 130 rotatably mounted to the valve body 110 is fixed to the shaft fixing portion 123. The shaft 130 penetrates the valve body 110 and engages the disk 120 to apply rotational force to the disk 120.

The disk 120 includes a front surface disposed to face the direction in which the fluid flows and a rear surface disposed at a position opposite to the front surface. In this case, the shaft fixing portion 123 is disposed on either the front or rear side, and the shaft fixing portion 123 faces the shaft through portion 112 disposed on the outer circumferential surface of the valve body 110. It can be formed to look. Through this structure, the shaft penetrates the valve body 110 and is coupled to the disk 120 at the shaft fixing part 123.

In this example, a mechanism in which rust is not generated even in long-term use may be applied by preventing corrosion of the disk and peripheral parts together with a structure in which the disk and the shaft are firmly coupled. Hereinafter, a valve having such a corrosion and rust prevention structure will be described in more detail with reference to the drawings.

FIG. 4 is an enlarged view of part E of FIG. 2, and FIG. 5 is an enlarged view of part F of FIG. 3.

Referring to these drawings, first and second shafts 131 and 132 may be disposed on both sides of the disk 120. One of the first and second shafts 131 and 132 may be a shaft connected to a driving device, and the other may be a shaft supporting the disk 120 on the opposite side of a driving shaft provided in the driving device. . For example, the driving shaft of the driving device and the first shaft 131 are connected to apply rotational force to the first shaft 131. In this case, the drive device may be an electric motor or a manual handle.

Meanwhile, an environment in which rust is generated may be formed by the connection structure between the disk and the shaft, and in this example, a mechanism for preventing this may be provided.

For example, an anti-corrosion film 170 may be formed to cover the surface of the disk to prevent corrosion of the disk. The anti-corrosion film 170 may be coated on the surface of the disk by spraying or the like. In addition, the anti-corrosion film may be formed on the inner circumferential surface of the valve body. That is, the anti-corrosion film 170 is applied to the portion where the fluid is in contact with the valve body and the disk, to prevent corrosion of the metal material.

In this case, the anti-corrosion film 170 may be formed of a polyurethane composition. More specifically, the polyurethane composition may include a prepolymer prepared by the reaction of isocyanate and alkoxysilane. In addition to this, the polyurethane composition is 2-hydroxyethyl ester of acrylic acid, 2-hydroxyethyl ether of acrylic acid, 2-hydroxypropyl ester of acrylic acid, 2-hydroxypropyl ether of acrylic acid, ethylene glycol methyl ether acrylate, ethylene glycol ethyl It may include at least one selected from the group consisting of ether acrylate, grisidyl methacrylate. According to such a composition, it is possible to exert a function of preventing corrosion for a long time, especially in the case of fluid contact inside the valve.

Existing polyurethane has insufficient stability to moisture, so it is difficult to form a film with a spray or brush, and bubbles are easily formed on the surface of the film, causing corrosion of valves or pipelines such as water infiltration through pores generated at this time. In particular, due to the lack of chlorine and oxygen resistance of the membrane, it was unable to maintain a corrosion protection function for a long time.

However, the composition of the anti-corrosion film 170 is easy to control the viscosity and can suppress the generation of carbon dioxide gas by reaction with moisture, which is a disadvantage of the polyurethane coating, to form a high-strength film without micropores on the film surface. In addition, the bonding properties of alkoxysilane and acrylic acid provide flexibility and rigidity, so that the anti-corrosion film 170 is excellent in chemical resistance, water resistance, durability, adhesion, abrasion resistance, and impact resistance.

Furthermore, the composition of the anti-corrosion film 170 has cavitation resistance, and the low-viscosity coating can be applied by a spray brush, roller, knife, or other easily accessible method, thereby easily preventing the anti-corrosion film 170 in a short time. Can form.

However, in order to completely apply the inside of the valve to the anti-corrosion film 170, a manufacturing difficulty occurs. In particular, it is very important to secure the accuracy of the connection between the shaft and the disc, and for this, it is necessary to remove a part of the corrosion preventing film 170. In this example, a sealing structure is added to a structure in which a part of the anti-corrosion film 170 is removed to prevent corrosion while accurately connecting the shaft and the disk.

As an example of this, the first and second shafts 131 and 132 are respectively connected to the disk 120 by a disk pin 140 penetrating through the shaft 130 and connected to at least a portion of the disk 120. Can be concluded. The disk pin 140 penetrates the shaft 130 and is connected to at least a portion of the disk 120. More specifically, the shaft fixing part 123 protrudes from the disk 120, and the shaft 130 and the disk pin 140 are inserted in the perpendicular direction from the shaft fixing part 123, A pin insertion hole 133 into which the disk pin 140 is inserted is formed in the shaft 130.

For example, the shaft fixing part 123 has a boss 124 protruding from either the front or rear of the disk 120, and the boss 124 is parallel to the disk 120 It can be extended to form a shaft insert.

The shaft insertion portion may include an insertion hole 126 into which the shaft 120 is inserted, and a pinhole 127 penetrating the outer surface of the shaft insertion portion to the insertion hole 126.

The pin hole 127 is formed in a direction perpendicular to the insertion hole 126 through the outer surface of the shaft fixing portion 123 so that the disk pin 140 is inserted. That is, the insertion hole 126 is formed on one surface of the shaft fixing part so that the shaft is inserted, and the pin hole 127 is perpendicular to the insertion hole on the other surface of the shaft fixing part so that the disk pin is inserted. Is formed by. More specifically, the shaft fixing part 123 protrudes from one surface of the disk 130, and the insertion hole 126 and the pin hole 127 are parallel to one surface of the disk 130 in a direction perpendicular to each other. Is formed.

According to the drawing, the pinhole 127 is formed to sequentially penetrate the first portion of the boss, the shaft, and the second portion of the boss along the longitudinal direction of the disk pin 140. Through this, the pin hole 127 has a first pin hole 127a and a second pin hole 127b disposed on both side walls of the insertion hole 126, and is formed in a direction perpendicular to the insertion hole 126. do. The disk pin 140 may be fixed by a nut passing through the first pin hole 127a, the pin insertion hole 133, and the second pin hole 127b. In this case, the nut can be a hexagon nut.

The shaft fixing part 123 is formed on both sides based on the center of the disk 120, and the first shaft fixing part 123a and the first shaft 131 and the second shaft 132, respectively, are connected. A two-shaft fixing portion 123b may be provided. The first shaft fixing portion 123a and the second shaft fixing portion 123b are provided with the insertion hole 126, the first pin hole 127a, and the second pin hole 127b, respectively, and the disc pin 140 and Can be concluded.

At this time, in order to reduce the shear force applied to the disk pin 140 in the open state, the first pin hole 127a, the pin insertion hole 133, and the second pin hole 127b are respectively parallel to the disk 120. It can be formed in one direction.

In addition, the disk pin 140 and the pinhole 127 are disposed in a direction perpendicular to the flow path in a state where the flow path of the valve body 110 is closed. Therefore, when the disk 120 is closed by rotating approximately 90 degrees along the rotation path, there may be an advantage that there is almost no pressure difference between the inlets of the first pin hole 127a and the second pin hole 127b.

In this case, the shaft 130 penetrates the valve body 110 and is inserted into the insertion hole 126. For example, a shaft penetrating portion 112 into which the shaft 130 is inserted may be formed on the valve body 110 facing the shaft fixing portion 123.

In the valve of the structure described above, it is very important that the shaft and the disc are engaged in the correct position of the valve body. To this end, in a state in which the disk is temporarily coupled to the valve body, a manufacturing method of processing the shaft through portion 112 and the insertion hole 126 may be used. In addition, after the shaft is inserted into the shaft through portion 112 and the insertion hole 126, the first pin hole 127a, the pin insertion hole 133, and the second pin hole 127b are cut, and thereafter Assemble the disc pin. According to this manufacturing process, a very accurate combination is possible.

Meanwhile, an area in which the anti-corrosion film 170 is not applied may be formed in at least a part of the insertion hole 126 or the pin hole 127 by the cutting process. For example, the pinhole 127 is formed to penetrate the shaft fixing part 113, for example, the boss 124 by cutting, so that the corrosion preventing film 170 is applied to the inner circumferential surface of the pinhole 127. It may not be.

According to the drawing, the shaft fixing portion includes a first O-ring portion 161 and a second O-ring portion 162 to prevent corrosion on the inner circumferential surface of the insertion hole 126 or the pin hole 127.

The first O-ring portion 161 is disposed in the insertion hole 126 and is formed to surround the shaft 130. For example, the first O-ring unit 161 may include O-rings disposed at both ends of the insertion hole 126, respectively. O-ring grooves into which the O-rings are inserted may be formed in a portion of the shaft 130 that is inserted into the insertion hole 126, and the O-ring grooves are each at a distance (actually a short distance) corresponding to the length of the insertion hole. Can be separated. In this case, for more precise sealing, it is also possible that a plurality of O-rings are respectively disposed at both ends of the insertion hole 126. For example, a plurality of O-rings are disposed at one end adjacent to the shaft through portion 112 in the insertion hole 126, thereby securing an assembly tolerance.

The second O-ring part 162 is disposed in the pinhole to surround the disk pin 140. For example, the second O-ring unit 162 may include O-rings disposed in the first pin hole 127a and the second pin hole 127b, respectively. According to the illustration, the O-rings may be disposed at outer entrances of the first pin hole 127a and the second pin hole 127b. For this structure, an O-ring groove into which O-rings are fitted may be formed on the inner circumferential surfaces of the first pin hole 127a and the second pin hole 127b.

As described above, the insertion hole and the pin hole are formed by cutting after the corrosion-prevention layer is applied to cover the disk, and an O-ring is fitted to the shaft and the disk to be disposed in the opening of the insertion hole and the pin hole. The flow of fluid into the insertion hole and the pin hole may be restricted.

In addition, according to the illustration, an area to which the anti-corrosion film is not applied may be formed on the shaft through portion 112, and in order to seal this portion, the shaft through portion 112 has an O-ring surrounding the shaft 130. 163 may be disposed.

For example, the circumferential protrusion 114 protrudes from the inner circumferential surface of the shaft through portion to form a stepped jaw in the opening of the shaft through portion 112, and the O-ring 163 surrounding the shaft 130 is the circumferential protrusion 114 ).

According to the structure described above, a part in contact with the fluid is a corrosion-prevention film, and the other part is a sealing structure to prevent corrosion, and a new type of valve can be implemented. In addition, since the insertion hole and the pin hole can be processed during the valve installation process, it is possible to prevent corrosion and to be accurately combined, and a complicated structure or manufacturing process is not required for this.

Meanwhile, the corrosion and rust prevention structure of the present invention described above can be applied to various valves. As such an example, as shown in FIGS. 6 to 10, a ball valve having a corrosion and rust prevention structure is also possible.

Figure 6 is a front view of a valve having a corrosion and rust prevention structure according to another embodiment of the present invention, Figure 7 is a cross-sectional view taken along the AB section of the ball valve of Figure 6, Figure 8 is the shaft of the ball valve of Figure 6 Fig. 9 is an enlarged view of portion G of Fig. 7 when the fixing part is viewed in the CD direction.

Referring to these drawings, the valve 200 is a ball valve, and may have an example corrosion and rust prevention structure described with reference to FIGS. 1 to 5.

In this case, the structures of the valve body 210, the anti-corrosion film (not shown), the shaft 230, the disc pin 233, the shaft fixing portion 223, and the shaft through portion 212 are illustrated in FIGS. It is the same as the example of FIG. 5, and the description is replaced with the above. However, the difference between the above-described example is that the shaft fixing portion 223 is formed on the ball disk of the ball valve, which will be described.

Referring to Figure 6, the disk 220 of the ball valve is made of a ball having a through hole in one direction. In FIG. 6, the left side of the C-D line represents a closed state perpendicular to the flow path of the through hole, and the right side represents an open state in which the flow path is opened while the disk 220 rotates relative to the shaft 230. In order to fully open the flow path, the disk 220 must rotate approximately 90 degrees from the closed state along the rotation path.

The shaft fixing part 223 is formed on the left and right sides of the disk 220, and the shaft 230 is coupled to the shaft fixing part 223.

The shaft fixing part 223 includes bosses 224 formed on both sides of the disk 220, and the boss 224 extends in a direction away from the disk 220 to form a shaft insert. .

The shaft insertion portion may include an insertion hole 226 into which the shaft 220 is inserted, and a pin hole 227 penetrating through the outer surface of the shaft insertion portion to the insertion hole 226.

The pin hole 227 has a first pin hole 227a and a second pin hole 227b disposed on both side walls of the insertion hole 226, and the disk pin 240 is the first pin hole 227a, It may be fixed by a nut passing through the pin insertion hole 233 and the second pin hole 227b.

According to the drawing, the shaft fixing portion includes a first O-ring portion 261 and a second O-ring portion 262 to prevent corrosion on the inner circumferential surface of the insertion hole 226 or the pin hole 227. The structures of the first O-ring part 261 and the second O-ring part 262 and their surrounding structures are the same as the examples of FIGS. 1 to 5 described above, and the description is replaced with the above-described contents.

Further, according to the drawing, an area in which the anti-corrosion film is not applied may be formed on the shaft through portion 212, and in order to seal this portion, the shaft through portion 212 has an O-ring surrounding the shaft 130. 263 may be disposed.

According to the example described above, even in the ball valve, a portion in contact with the fluid is a corrosion-preventing film, and the other portion is a sealing structure to prevent corrosion, and a new type of structure may be applied.

In the present invention, the valve described above is not limited to the configuration and method of the above-described embodiments, but the above-described embodiments may be modified in various ways.

In addition, in the present invention, not only the above-described embodiments are limited, but all or some of the embodiments may be selectively combined.

Claims (10)

A valve body installed in the pipeline;
A disc rotatably installed inside the valve body to open and close the flow path of the valve body;
An anti-corrosion film covering the surface of the disc to prevent corrosion of the disc;
A shaft passing through the valve body and engaging the disc to apply rotational force to the disc;
A disc pin passing through the shaft and connected to at least a portion of the disc; And
It protrudes from the disk, and includes a shaft fixing portion that is inserted such that the shaft and the disk pins are perpendicular to each other,
The shaft fixing portion,
An insertion hole into which the shaft is inserted, and at least a portion of which the anti-corrosion film is not applied;
A first O-ring portion disposed in the insertion hole to prevent corrosion on the inner circumferential surface of the insertion hole and surrounding the shaft;
A pin hole formed in a direction perpendicular to the insertion hole through the outer surface of the shaft fixing portion so that the disk pin is inserted; And
It is disposed in the pinhole to prevent corrosion on the inner circumferential surface of the pinhole and includes a second O-ring portion surrounding the disk pin,
The shaft fixing part has the insertion hole and has a boss protruding from one surface of the disk,
The insertion hole and the pin hole are disposed in a direction perpendicular to each other, each formed in a direction parallel to the one surface,
The first O-ring portion has O-rings disposed at both ends of the insertion hole,
The pinhole is formed to sequentially pass through the first portion of the boss, the shaft and the second portion of the boss along the longitudinal direction of the disk pin,
The second O-ring portion includes an O-ring disposed in the first pin hole of the first portion and the second pin hole of the second portion, respectively.
The anti-corrosion film is formed of a polyurethane composition,
The polyurethane composition,
A free polymer prepared by the reaction of isocyanate and alkoxysilane; And
It is combined with the alkoxysilane of the prepolymer, and 2-hydroxyethyl ester of acrylic acid, 2-hydroxyethyl ether of acrylic acid, 2-hydroxypropyl ester of acrylic acid, 2-hydroxypropyl ether of acrylic acid, ethylene glycol methyl ether acrylate, ethylene A valve comprising at least one selected from the group consisting of glycol ethyl ether acrylate and grisidyl methacrylate. According to claim 1,
The pinhole is formed so as to penetrate the shaft fixing portion by cutting, the valve characterized in that the anti-corrosion film is not applied to the inner peripheral surface of the pinhole. delete According to claim 2,
The disk pin and the pinhole, characterized in that the valve body is arranged in a direction perpendicular to the flow path in a closed state. delete delete According to claim 1,
The valve body is formed with a shaft through portion facing the shaft fixing portion and into which the shaft is inserted,
A valve characterized in that an o-ring surrounding the shaft is disposed in the shaft through portion. The method of claim 7,
The circumferential protrusion protrudes from the inner circumferential surface of the shaft through portion to form a stepped jaw in the opening of the shaft through portion,
A valve characterized in that the O-ring surrounding the shaft is engaged with the circumferential protrusion. delete A valve body installed in the pipeline;
A disc rotatably installed inside the valve body to open and close the flow path of the valve body;
An anticorrosion film covering the surface of the disk to prevent corrosion of the disk and formed of a polyurethane composition;
A shaft passing through the valve body and engaging the disc to apply rotational force to the disc;
A disc pin passing through the shaft and connected to at least a portion of the disc; And
And a shaft fixing part having an insertion hole in which the shaft is inserted, and a pin hole formed in a direction perpendicular to the insertion hole so that the disk pin is inserted,
The insertion hole and the pin hole are formed by cutting after the anti-corrosion film is applied to cover the disk,
O-rings are fitted to the shaft and the disk to limit fluid from entering the insertion hole and the pinhole, and are disposed in the openings of the insertion hole and the pinhole.
The shaft fixing part has the insertion hole, and has a boss protruding from one surface of the disk,
The insertion hole and the pin hole are disposed in a direction perpendicular to each other, each formed in a direction parallel to the one surface,
O-rings are respectively disposed at both ends of the insertion hole to restrict fluid from flowing into the insertion hole,
The pinhole is formed to sequentially pass through the first portion of the boss, the shaft and the second portion of the boss along the longitudinal direction of the disk pin,
O-rings are respectively disposed in the first pin hole of the first part and the second pin hole of the second part to limit fluid from entering the pin hole,
The anti-corrosion film is formed of a polyurethane composition,
The polyurethane composition,
A free polymer prepared by the reaction of isocyanate and alkoxysilane; And
It is combined with the alkoxysilane of the prepolymer, and 2-hydroxyethyl ester of acrylic acid, 2-hydroxyethyl ether of acrylic acid, 2-hydroxypropyl ester of acrylic acid, 2-hydroxypropyl ether of acrylic acid, ethylene glycol methyl ether acrylate, ethylene A valve comprising at least one selected from the group consisting of glycol ethyl ether acrylate and grisidyl methacrylate.

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