KR102095179B1 - Valve structure which has improved durability and which is ease to assemble - Google Patents

Abstract

Disclosed is an easily assembled valve structure with improved durability. According to the present invention, the valve structure comprises a body (410, 610), a cylindrical watertight sheet (40′, 60′), and a disk (440, 640), wherein the watertight sheet (40′, 60′) includes a lower sheet (420, 620), a disk shaped upper sheet (422, 622), a disk shaped sheet packing (424, 624), and a fixing bolt (426, 626), and the disk (440, 640) includes a protrusion ring (450, 650).

Description

Valve structure which has improved durability and which is ease to assemble

The present invention relates to a valve structure, and particularly to a valve structure with improved durability and easy assembly.

A movable mechanism that allows the passage to be opened or closed to allow fluid to flow through, or to block or control, is called a valve. Valves are classified or referred to in various ways depending on the purpose, structural type, etc., and adjust the flow rate by seating on the valve seat or falling off the valve seat.

1 shows a conventional valve structure applied to a ready-operated valve. When the valve structure shown in FIG. 1 is applied to a ready-operated valve, the inlet 12 is the primary side through which the fluid flows, and the outlet 12a is defined as the secondary side through which the fluid is discharged, the inlet 12 Between the outlet (12a) and the communication hole 12 is formed, the communication hole 12 is provided with a cylindrical seat ring (14). The communication hole 12 is configured to be selectively closed by a disk 20 acting on one side in the axial direction of the seat ring 14. The disk 20 has one side rotatably coupled to the body 10 and a hinge 22, and the other side is formed as a free end and configured to open and close the communication hole 12 by rotation. On one side of the disk 20, a disk packing 30 that is substantially airtight in contact with the seat ring 14 is fixed by a disk washer 40 and a fixing screw 80. In addition, the one side of the body 10 is sealed to the cover 52, the tertiary side operating unit is provided with a diaphragm 50 is installed, the actuator 52 is fixed to the diaphragm 50, the actuator 52 Is pressed by the hinge lever 72 coupled to the body 10 to rotate the locking lever 70 so that the disk 20 is always in a closed position. The side on which the actuator is installed is defined as a tertiary side where another pressure is applied.

However, the pre-actuated valve including the valve structure as described above is a form in which the disc packing is formed in a plane to suppress the primary water pressure by forcibly pressing the locking lever 70 to lift the free end of the disc 20 Therefore, there is a problem in that a pressing mark of the seat ring 14 is generated in the disc packing 30. In addition, since the force pressed against the seat ring 14 at the fixed end and the free end of the disc packing 30 is different, the disc packing 30 is not constantly pressed. Because of this, when it is opened once and then closed again, the marks pressed by the seat ring 14 do not return to the same position as they occur at different positions of the disc packing 30, and a leak occurs, and furthermore, when the time passes, As the elasticity of the disc packing 30 disappears due to aging and curing, there is a problem that most sheet leakage occurs. In addition, when the body is processed, the upper height of the seat ring 14 and the center of rotation of the disk 20 have a small tolerance between the hinge 22, and thus there is a problem that processing is difficult. That is, if the hinge 22 is low, no matter how much it is pressed with the locking lever 70, the free end of the disc 20 is not pressed, and conversely, if the hinge 22 is high, a leak occurs at the fixed end of the disc. It is. In addition, since the disc 20 pressed by the locking lever 70 is pressed infinitely without a special resistance means, excessive force is continuously applied to the disc packing, and eventually the third pressure changes (decreases) over time. If it occurs, there is a problem that a leak occurs due to deformation of the disc packing.

A ready-operated valve employing another conventional valve structure for solving this problem is disclosed in Korean Patent Publication No. 10-1523886. 2 is a cross-sectional view showing a ready-operated valve to which another conventional valve structure is applied. Referring to FIG. 2, a bent portion surrounding the edge of the disc washer is formed around the disc packing, and a reinforcing portion surrounding the bent portion of the disc packing is configured to protrude downward, and a stopper for restricting the rotation of the disc is formed according to the primary water pressure. The adhesion strength was changed so that no leakage occurred even when the primary pressure was changed.

In addition, when the actuator 60 is operated by the pressure applied to the tertiary side and pushes the locking lever 70, the locking lever 70 rotates about the hinge 72 and presses the upper surface of the disc 20, and the disc (20) is rotated in the direction of closing the seat ring (14) around the hinge (22). The disk 20 is further limited in rotation at a position where the lower end of the stopper 26, which protrudes from the free end to the lower part, contacts the body 10. Therefore, in the closed state, the contact distance between the disc packing 30 and the seat ring 14 is always maintained at a constant distance, and when the disc packing 30 is rotated by the pressing of the locking lever 70, the seat ring 14 Strong contact does not occur, and only the contact state is maintained. In particular, since the stopper 26 is provided, the disc 20 is no longer pressed even when the pressure is largely acting on the tertiary side, so that a problem with the seating marks remaining or damaged in the disc packing 30 can be prevented.

On the other hand, in the above state, the high pressure of the fluid flowing in from the primary side acts on the surface of the disc washer 40. This action force is pressed against the disc packing 30 through the disc washer 40. At this time, the disk packing 30, which is a rubber material, is compressed between the disks 20 and eventually results in the radial expansion. Therefore, the disk packing 30 extending outward in the radial direction is caught by the reinforcing part 24 of the disk 20, filling the inner space of the reinforcing part 24, pressing the disk packing 30 down, and seating. The top surface of the ring 14 is pressed into contact. Therefore, the inflowing fluid applied to the primary side maintains airtightness, and as the water pressure increases, the force acting on the disk packing 30 increases and proportionally increases the contact force between the disk packing 30 and the seating 14. This increases the airtightness.

However, the fluid resists the stretching of the disk packing 30 as well as the action of pressing the disk washer 40. This is because the extending portion is the bent portion 32, because the position of the bent portion 32 is located in the opposite direction to the direction of the hydraulic pressure. Moreover, since the disk washer 40 is fixed through the fixing screw 80 at the center, the part deformed by elasticity due to pressure becomes the outer side rather than the center, so when the outer part partially presses the disk packing 30 There is also a problem that the increase in the bent portion 32 also interferes. In addition, a stopper is installed to prevent excessive pressure from being applied. In this case, if the height of the stopper is high due to a machining tolerance, the bent portion 32 is not pressed against the seat 14, and if it is low, the bent portion 32 is prevented. ) Is pressed against the sheet 14 so that the bent portion 32 is damaged.

Another conventional invention for solving the above-mentioned problems of the prior art is disclosed in Korean Patent Registration No. 10-1631050. Referring to FIG. 3, the pre-actuated valve according to the published patent extends the bending of the disk packing in a U-shape rather than using the force of the disk washer pressing the disk packing in order to solve the problems occurring in the prior art as described above. The bent portion is intended to be detachable from the surface of the disc washer and to form a gap to deform outward by hydraulic pressure to press the seat ring so that the pressure sealing can be made efficiently. In order to make this principle more efficient, the inner edge of the end of the bent portion is formed in a curved shape so that the bent portion is well deformed by fluid pressure. In addition, the rounding of the seating edges makes it possible to cause less damage to the bent portions in the seating edges by the sealing method by bending deformation. In addition, through the above principle, even if a stopper for limiting the rotation of the disk is not provided, fluid sealing can be smoothly performed.

To this end, the ready-to-operate valve includes a body 10 having a communication hole 12 formed therein, a seat ring 14 installed in the communication hole 12 of the body 10, and one side of the body 10 ) Is hinged to the other side, the other side is formed as a free end, the outer surface is selectively in contact with the seat ring 14, the disk 20 to selectively open and close the communication hole 12, and the outer surface of the disk 20 Disc packing 30 which is disposed in contact with the seat ring 14 so as to maintain airtightness, and a disk washer 40 which is in contact with the outer surface of the disk packing 30 and screwed to the disk 20. The bent portion 32 surrounding the edge of the disc washer 40 is configured to extend around the disc packing 30, and the bent portion of the disc packing 30 is provided on the disc 20. 32) the reinforcing part 24 surrounding the protrusion is configured to protrude downward, and the disk washer 40 has a A stepped portion 42 is formed in the seat portion, and the stepped portion 42 is a ready-operated valve configured to be fitted to the bent portion 32 of the disc packing 30, wherein the bent portion 32 is The inner circumferential surface is separated from the outer circumferential surface of the step portion 42 of the disk washer 40, and a round portion 32b formed in a curved shape is formed at an inner edge of the end 32a of the bent portion 32, and the bending is performed. The end portion 32a of the portion 32 is spaced apart from the boundary stepped portion 42a of the disc washer 40 and the step portion 42, and the pressure receiving space is provided between the end portion 32a and the stepped portion 42a of the bent portion 32. (42b) is formed, the fluid toward the inner side from the communication hole 12 side is accommodated in the pressure receiving space (42b) while the bending portion 32 exerts a force spreading to the outside of the bending portion (32) The outer surface is to be in close contact with the seat ring 14, the seat ring round portion 14a is formed at the inner edge of the seat ring 14 It is done.

However, in the conventional valve structure as described above, in order to wrap the disc packing 30 in the disc washer 40, the metal disc washer 40 must be inserted into the disc packing 30 made of soft rubber. There is a problem in that it has to be carried out by demanding manual work, and in the process, the edge portion of the disc packing 30 is deformed, causing a defect. In addition, in the process of opening and closing the valve, when excessive pressure is applied to the disc packing 30 due to the tolerance of the valve, leakage occurs frequently due to the occurrence of a mark due to pressing and leakage even if it does not adhere properly. There is a problem that a problem such as occurs.

The present invention has been developed to solve the above problems, and the technical problem to be achieved by the present invention is to improve durability and facilitate assembly by watertightness by using a difference in water pressure acting on the seat portion without applying disk packing. Is to provide a structure.

The valve structure having improved durability and easy assembling according to the present invention for achieving the above-described problems includes bodies 410 and 610 having communication holes 400 and 600 formed therein, and communication holes 400 of the bodies 410 and 610, Cylindrical water-tight seat (40 ', 60') inserted into the 600, and the bottom surface is seated on the upper surface of the water-tight sheet (40 ', 60') to block the discharge of firefighters through the communication holes (400, 600) Discs 440 and 640, wherein the watertight sheets 40 'and 60' have lower discs 420 and 620 having a disc-shaped upper surface having a first inner diameter D1, and lower discs 420, Disk-shaped upper sheets 422 and 622, which are in close contact with the upper surfaces of the first inner diameter D1 and have a second inner diameter D2 equal to or smaller than the first inner diameter D1, and lower sheets 420 and 620 and upper sheets 422, 622) disk-shaped sheet packing (424, consisting of an inner diameter smaller than the second inner diameter (D2) and extending to the center of the communication holes (400, 600) by a certain length 624, and fixing bolts 426 and 626 fixedly coupled to the lower sheets 420 and 620 through the upper sheets 422 and 622 and the sheet packings 424 and 624, and the disk 440. , 640, has a belt shape on its bottom surface and is formed to protrude to a certain height and includes protruding rings 450 and 650 that are smaller than the second inner diameter D2 and larger than the inner diameter of the sheet packings 424 and 624. It is characterized by being made.

In addition, it is preferable that the inner edges of the protruding rings 450 and 650 further include curved round portions 452 and 652.

In addition, the sheet packing 424 is synthesized by adding and mixing 10 to 30 parts by weight of EPDM, 2 to 5 parts by weight of cellulose fiber, and 0.5 to 1 part by weight of titanium oxide (TiO2) based on 100 parts by weight of rubber. It is more preferred.

The valve structure according to the present invention is made of a watertight structure using a difference in water pressure acting on a seat portion without applying a disc packing, so that assembly is not only easy, but pressure is not applied to the contact portion for watertightness during the opening and closing process. Therefore, there is an effect of improving durability. In particular, when applied to a pre-actuated valve, there is an advantage that the swing type platter is free from the pressure generated in the process of opening and closing and the allowable range for clearance is wide.

1 is a sectional view showing an example when applied to a pre-operated valve as a conventional valve structure,
2 and 3 is a cross-sectional view showing a ready-operated valve to which another conventional valve structure is applied,
Figure 4 is a cross-sectional view showing the structure of a ready-operated valve applying a valve structure according to an embodiment of the present invention,
FIG. 5 is an enlarged view showing a core portion of FIG. 4;
6 is a cross-sectional view for explaining the effect of the valve structure according to the present invention,
Figure 7 is a bottom perspective view showing the structure of the disk constituting the valve structure according to the invention,
8 is an exploded perspective view showing the structure of the watertight seat 40 'constituting the valve structure according to the present invention, and
9 is a cross-sectional view showing an example of an angle type globe valve structure to which a valve structure according to an embodiment of the present invention is applied.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

4 is a cross-sectional view showing a pre-operated valve to which a valve structure according to an embodiment of the present invention is applied, and FIG. 5 is an enlarged view of a main part in FIG. 4.

4 and 5, the valve structure according to the present invention is a valve structure that opens and closes a passage to allow fluid to flow through, or to block or control the fluid. Cylindrical water-tight sheet 40 ', which is inserted into the communication hole 400, and its bottom surface is seated on the upper surface of the water-tight sheet 40', and disc 440 blocking the discharge of fire water through the communication hole 400 It is made including.

The watertight sheet (40 ', 60'),

A disc having a second inner diameter D2 equal to or smaller than the first inner diameter D1 by being in close contact with the upper surface of the lower seat 420 and the lower seat 420 having a disc-shaped upper surface having a first inner diameter D1. The upper sheet 422, the lower sheet 420 and the upper sheet 422 is mediated between the second inner diameter (D2) and consists of an inner diameter smaller than the disc length of the communication hole 400 by a certain length It comprises a seat packing 424, and a fixing bolt 426 that is fixedly coupled to the lower sheet 420 through the upper sheet 422 and the seat packing 424,

The disk 440,

It has a belt shape on the bottom surface and is formed to protrude to a constant height, and includes a protruding ring 450 made of an inner diameter smaller than the second inner diameter D2 and larger than the inner diameter of the sheet packing 624. The disk 440 may be integrally formed to form a single clapper, or may be formed of a disk assembly 442 and a disk body 444 to form a clapper.

In addition, a round portion 652 having a curved surface is formed at an inner edge of the protruding ring 650.

In the above embodiment, it is shown as an example that is applied to a ready-operated valve that is opened and closed by a diaphragm. That is, inlet and outlet are formed at the upper and lower portions of the valve body, spaces are formed inside, vents and outlets are formed at the sides, and a watertight seat is formed inside the valve body, and the watertight seat is opened through the inlet. A hole is formed. In addition, the valve opening and closing control unit of the diaphragm method is coupled to the inside of the valve body to control the movement of the fluid by opening and closing the seat seat, and the valve opening and closing control unit is coupled to the seat mounting unit to close or open the opening hole. It includes a housing having a clapper hinged with 410 and a 430, a diaphragm for elevating and operating the clapper, and a chamber through which the diaphragm is coupled and fluid enters and exits.

6 is a cross-sectional view for explaining the effect of the valve structure according to the present invention. Referring to Figure 6, the valve structure according to the present invention as described above, the disk 440 is closed while the hydraulic pressure of the primary side is discharged from the communication hole 400 to the valve body 410, but the disk 440 is closed Because it is a state, it is intensively applied to the bottom surface of the sheet packing 424.

At this time, as shown in Fig. 7, the bottom surface of the disk 440 has a belt-shaped protrusion ring 450 which is formed to protrude to a certain height, so that the seating pressure 424 is brought into contact with the protrusion ring 450. Since the protruding rings 450 and 650 are smaller than the second inner diameter D2 and larger than the inner diameter of the seat packing 424, the inner end of the seat packing 424 is bent in a direction in which water pressure is applied. As a result, the watertightness of the disk 440 and the communication hole 400 is achieved.

At this time, the valve structure is made of a structure in which water-tightness is made by using a difference in water pressure acting on the seat portion, not a structure of applying packing to the disc side to be opened and closed, and the disk 440 is applied to the upper surface of the water-tight seat 40 '. When the primary water pressure is applied in the close state, it is sealed, so that pressure is not applied to the contact portion for watertightness during the opening and closing process, so durability is improved compared to the prior art. In addition, there is an advantage in that the problem of water leakage is greatly improved since a difficult process of inserting the disc into the rubber packing is not required and there is no possibility of damage to the actual watertight part in the process.

In addition, as shown in FIG. 8, the structure of the watertight sheet 40 'is shown as an exploded perspective view. Referring to Figure 8, the lower sheet 420 having a disc-shaped upper surface, the upper sheet 422 of a disc-shaped close contact with the upper surface of the lower sheet 420, the lower sheet 420 and the upper sheet 422 between the mediation It is made of a soft rubber seat packing 424 made of an inner diameter smaller than the second inner diameter D2 and extending to the center side of the communication hole 400 by a predetermined length, and the fixing bolt 426 as shown in FIG. The upper sheet 422 and the sheet packing 424 are penetrated and fixedly coupled to the lower sheet 420. The fixing bolt 426 should prevent the head from protruding.

It is more preferable that the lower sheets 420 and 620 have a first inner diameter D1 and the inner diameters of the upper sheets 422 and 622 with a second inner diameter D2 smaller than the first inner diameter D1.

The valve structure according to the present invention as described above is made of a structure in which water-tightness is made by using a difference in water pressure acting on a seat portion without applying disk packing, as well as easy assembly and pressure on the contact portion for watertightness in the opening and closing process. Since this is not applied, there is an effect of improving durability. In particular, when applied to a pre-actuated valve, there is an advantage that the swing type platter is free from the pressure generated in the process of opening and closing and the allowable range for clearance is wide.

9 is a cross-sectional view showing an example of an angle type globe valve structure to which a valve structure according to an embodiment of the present invention is applied. Referring to FIG. 9, an angle type globe valve to which a valve structure according to the present invention is applied is a valve structure that opens and closes a passage to allow fluid to flow through, or to block or control fluid,

The body 610 having a communication hole 600 formed therein, and a cylindrical water-tight sheet 60 'inserted into the communication hole 600 of the body 610, and the bottom thereof, the upper surface of the water-tight sheet 60' Included in the disk 640 to block the discharge of firefighters through the communication hole 600 is seated in,

The watertight sheet 60 ',

As in the embodiment described with reference to FIG. 6, the lower sheet 620 having a disc-shaped upper surface having a first inner diameter D1 and the upper surface of the lower sheet 620 are in close contact with the first inner diameter D1 It is a disc-shaped upper sheet 622 having a second inner diameter D2 and a lower inner diameter of the inner diameter smaller than the second inner diameter D2 and mediated by a predetermined length. It comprises a disc-shaped sheet packing 624 extending to the center side of the 600, and fixing bolts 626 that are fixedly coupled to the lower sheet 620 through the upper sheet 622 and the sheet packing 624. under,

The disk 640,

It has a belt shape on the bottom surface and is formed to protrude to a certain height, and includes a protruding ring 650 that is smaller than the second inner diameter D2 and larger than the inner diameter of the sheet packing 624.

The angle-type globe valve to which the valve structure according to the present invention is applied as described above is rotated by a handle 660 to lower the opening / closing rod 662, so that the hydraulic pressure of the primary side is closed from the communication hole 600 in the state where the disc 640 is closed. Although the disk 640 is closed to be discharged to the body 610, it is intensively applied to the bottom surface of the seat packing 424.

At this time, as described with reference to FIG. 7, the bottom surface of the disk 440 is formed with a band-shaped protruding ring 650 protruding to a certain height so that the sheet packing 624 contacts the protruding ring 650. Water pressure is applied, and the protruding ring 650 is made smaller than the second inner diameter D2 and larger than the inner diameter of the seat packing 624, so the inner end of the seat packing 624 is bent in a direction in which water pressure is applied. As a result, the watertightness of the disk 640 and the communication hole 600 is achieved.

At this time, the valve structure is made of a structure in which watertight is made by using a difference in water pressure acting on a seat portion, not a structure of applying packing to the disc side to be opened and closed, and the disk 640 is applied to the upper surface of the watertight seat 60 '. When the primary water pressure is applied in the close state, it is sealed, so that pressure is not applied to the contact portion for watertightness during the opening and closing process, so durability is improved compared to the prior art. In addition, there is an advantage in that the problem of water leakage is greatly improved since a difficult process of inserting the disc into the rubber packing is not required and there is no possibility of damage to the actual watertight part in the process.

Meanwhile, the sheet packing 424 is synthesized by adding and mixing 10 to 30 parts by weight of EPDM, 2 to 5 parts by weight of cellulose fiber, and 0.5 to 1 part by weight of titanium oxide (TiO2) with respect to 100 parts by weight of rubber. do.

[Example 1]

100 parts by weight of rubber, 20 parts by weight of EPDM, 3 parts by weight of cellulose fiber, 0.7 parts by weight of titanium oxide (TiO2)

[Example 2]

100 parts by weight of rubber, 20 parts by weight of EPDM, 3 parts by weight of cellulose fiber, 0.5 parts by weight of titanium oxide (TiO2)

[Example 3]

100 parts by weight of rubber, 20 parts by weight of EPDM, 3 parts by weight of cellulose fiber, 1 part by weight of titanium oxide (TiO2)

[Comparative Example 1]

100 parts by weight of rubber

[Comparative Example 2]

100 parts by weight of rubber, 10 parts by weight of EPDM, 3 parts by weight of cellulose fiber

[Comparative Example 3]

100 parts by weight of rubber, 20 parts by weight of EPDM, 0.7 parts by weight of titanium oxide (TiO2)

The sheet packing made as described above was applied to compare and evaluate the close and leak state and long-term resilience and durability when opened and closed 10,000 times at room temperature.

In the close and leak state, ◎ is very good and no leak is found, ○ is good in close contact and less than 10 times, a small amount of leak is found, △ is good in close contact but less than 10 times and less than 50 times A leak is found in, × indicates that the adhesion is normal or poor, and a leak exceeding 50 times is found. In the long-term resilience, ◎ is excellent in resilience, so that the deformation is less than 1%, ○ is deformed because it is excellent in resilience Retaining less than 5%, Δ indicates that the resilience is usually more than 5% and less than 10%, and × indicates that the resilience is poor and the deformation exceeds 10%. In addition, in durability, ◎ maintains the surface adhesion to the same state as the initial one, ○ maintains a decrease in surface adhesion of less than 5%, △ decreases the surface adhesion to more than 5% and less than 10%, × degrades surface adhesion It indicates that it exceeds 10%.

division Close and
Leak long time
dynamic stability durability Example 1 ◎ ○ ○ Example 2 ◎ ○ ○ Example 3 ◎ ○ ○ Comparative Example 1 △ × △ Comparative Example 2 ○ ○ △ Comparative Example 3 ◎ △ ×

When the rubber synthesized by adding and mixing EPDM, cellulose fiber, and titanium oxide (TiO2) with respect to the rubber as in Examples 1 to 3 was used, the rubber material as in Comparative Example 1 was compared. It showed very good adhesion and leakage.

On the other hand, in the case of Comparative Example 2, in which the cellulose fiber was added in an amount close to the smaller amount in the proper amount but the titanium oxide (TiO2) was not added, the adhesion and leakage prevention and long-term resilience were relatively excellent, but the durability was insufficient. appear. In addition, in the case of Comparative Example 3 in which an appropriate amount of EPDM was added but cellulose fiber 3 parts by weight was not added, it was found that adhesion and leakage prevention due to addition of EPDM are very excellent, but long-term resilience is insufficient, and durability is particularly rapidly decreased.

Therefore, it can be seen that adding EPDM to the rubber increases the adhesion and leak-proofing ability, but it is possible to supplement the weakened durability with titanium oxide, and further enhance the long-term resilience by adding cellulose fiber. have.

40 ', 60': Watertight sheet
400, 600: communication hole 410, 610: body
420, 620: lower seat 422, 622: upper seat
440, 640: Disc 424, 624: Seat packing
426, 626: Fixed bolt
D1: first inner diameter D2: second inner diameter
450, 650: Protrusion ring
452, 652: Round part

Claims (3)

In the valve structure for opening and closing the passage to pass through, block or control the fluid,
Body (410, 610) is formed with communication holes (400, 600) inside;
Cylindrical water-tight sheets (40 ', 60') are inserted into the communication holes (400, 600) of the body (410, 610); And
The bottom surface is seated on the upper surface of the watertight sheet (40 ', 60') discs (440, 640) to block the discharge of firefighters through the communication holes (400, 600);
The watertight sheet (40 ', 60'),
Second inner diameter (D2) equal to or smaller than the first inner diameter (D1) by being in close contact with the upper surfaces of the lower sheets (420, 620) having a disc-shaped upper surface having a first inner diameter (D1) It is composed of a disc-shaped upper sheet (422, 622), the lower sheet (420, 620) and the upper sheet (422, 622) is mediated between the inner diameter smaller than the second inner diameter (D2) of the communication hole by a predetermined length ( 400, 600, the disc-shaped sheet packing (424, 624) extending to the center side, and the upper sheets (422, 622) and the sheet packing (424, 624) through the fixed seat (420, 620) coupled It comprises a fixing bolt (426, 626),
The disk (440, 640),
It has a belt shape on the bottom surface and is formed to protrude to a certain height, and is characterized by comprising a protruding ring (450, 650) that is smaller than the second inner diameter (D2) and larger than the inner diameter of the seat packings (424, 624). Valve structure with improved durability and easy assembly. The method of claim 1, wherein the inner edge of the protruding ring (450, 650) is improved durability and the valve structure is easy to assemble, characterized in that it further comprises a curved portion (452, 652). The method of claim 1 or claim 2, wherein the sheet packing (424),
Durability is improved, characterized in that 10 to 30 parts by weight of EPDM, 2 to 5 parts by weight of cellulose fiber, and 0.5 to 1 part by weight of titanium oxide (TiO2) are added and mixed with respect to 100 parts by weight of rubber, Valve structure for easy assembly.

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