KR20170037432A

KR20170037432A - Triple eccentric butterfly valve having resilient airtight structure

Info

Publication number: KR20170037432A
Application number: KR1020150137052A
Authority: KR
Inventors: 박성택; 박정민
Original assignee: (주) 포엠엔지니어링; 박정민; 박성택
Priority date: 2015-09-25
Filing date: 2015-09-25
Publication date: 2017-04-04

Abstract

The present invention relates to a triple eccentric valve having a resilient airtight structure, and more particularly, to a triple eccentric valve having a resilient airtight structure in which a valve disc is elastically contacted with a valve seat having a plurality of resilient grooves, .
To this end, the present invention provides a valve assembly comprising: a valve body having a through-passage having a circular cross section formed at a central portion thereof; A valve seat ring disposed along an inner peripheral surface of the valve body, A retainer disposed along the inner circumferential surface of the through-passage of the valve body, the retainer being adapted to fix the valve seat ring according to the contact with the outer surface of the valve seat ring; A valve disc rotatably accommodated in the through passage of the valve body and selectively opening and closing the through passage as the outer circumferential surface contacts or separates from the through hole formed at the central portion of the valve seat ring; A valve disc accommodated and rotatable in the through passage of the valve body to open and close the oil in the through passage; And a valve shaft having a valve shaft rotatably coupled to the valve disc and selectively rotating the valve disc when the valve disc is coupled to the valve disc, the valve disc having a primary eccentricity in which a center of a flow path of the valve body is offset from a center of rotation of the valve disc, Wherein the inner surface of the valve seat ring includes a valve body having an inner surface on which an inner surface of the valve seat ring is connected to an outer surface of the valve body, And the other outer surface is disposed in contact with the retainer, and one or more elastic grooves are formed on the inner and outer surfaces of the valve seat ring, respectively.

Description

TRIPLE ECCENTRIC BUTTERFLY VALVE HAVING RESILIENT AIRTIGHT STRUCTURE,

The present invention relates to a triple eccentric valve having a resilient airtight structure, and more particularly, to a triple eccentric valve having a resilient airtight structure in which a valve disc is elastically contacted with a valve seat having a plurality of resilient grooves, .

In general, a butterfly valve is a valve that is formed to open and close a flow path formed inside a valve body by a disk, and usually, the disk is rotated by a stem to open and close the flow path, But also to supply fluids such as water, steam or gas at high temperature and high pressure.

Such a butterfly valve is divided into various types and forms according to the material of the valve seat to be coupled to the valve body, the shape of the disk, or the position where the stem is coupled to the disk. Usually, It is common to set the tube center of the body and the center of the disk or stem eccentrically.

A conventional butterfly valve having a multiple eccentric structure will be described with reference to the drawings. 1, the valve body 11 is provided with a disk 12 rotatably disposed inside the valve body 11 and having a circular cross-sectional shape for opening and closing an internal passage of the valve, A valve seat 13 is provided for contacting the circumferential surface of the disk 12 to maintain airtightness during opening and closing of the disk 12. A stem 14 for rotational driving is coupled to one surface of the disk 12 .

In this configuration, a primary eccentric X is formed in which the center of the disk 12 is displaced from the center of the channel of the valve body 11, and the center of the stem 14 and the center of the valve seat 13 A second eccentricity Y is formed and a third eccentric Z is formed in which the extension line of both end faces in which the disk 12 and the valve seat 13 are in contact with each other and the extension line of the heart of the valve body 11 are displaced Structure.

The triple eccentric butterfly valve is advantageous in that the opening and closing of the disk 12 is smooth and the airtight effect can be enhanced as compared with the double eccentric structure in which the first eccentric X and the second eccentric Y are formed, In the case of the conventional triple eccentric butterfly valve, since the shape of the valve seat 13 formed on the valve body 11 is different from that of the opposite side surfaces, the valve body 11 is manufactured by directly processing the valve body 11 This is followed by a hassle in production.

The disc 12 is further provided with a seat ring 15 which is in contact with the valve seat 13 so that the seat ring 15 can be moved directly There is a problem that the reduction of elasticity and deformation and abrasion can easily occur due to exposure.

Particularly, since the triple eccentric butterfly valve according to the related art has a structure as described above, when the fluid of high temperature and high pressure is used, there is a problem that deformation and abrasion degree of the seat ring 15 becomes worse, There is a limit to maintaining a reliable airtightness even when the airtightness with respect to the flow direction (forward direction) is reduced and a differential pressure is generated in the reverse direction with respect to the flow direction of the fluid.

Korean Unexamined Patent Publication (No. 10-2011-0098129) 2011. 09. 01.

SUMMARY OF THE INVENTION The present invention has been devised to solve the above problems and provides a coupling structure between a valve seat ring and a valve disc capable of maintaining rigid airtightness in both directions of fluid flow (positive and negative directions) The present invention provides a triple eccentric valve having a resilient airtight structure capable of greatly reducing the elasticity of the valve seat and minimizing the deformation and wear of the valve seat while maximizing the operation and hermetic effect, thereby greatly increasing the life of the device and reliability of operation.

The present invention has the following features in order to achieve the above object.

The present invention relates to a valve body in which a through passage having a circular cross section is formed at a central portion thereof; A valve seat ring disposed along an inner peripheral surface of the valve body, A retainer disposed along the inner circumferential surface of the through-passage of the valve body, the retainer being adapted to fix the valve seat ring according to the contact with the outer surface of the valve seat ring; A valve disc rotatably accommodated in the through passage of the valve body and selectively opening and closing the through passage as the outer circumferential surface contacts or separates from the through hole formed at the central portion of the valve seat ring; A valve disc accommodated and rotatable in the through passage of the valve body to open and close the oil in the through passage; And a valve shaft having a valve shaft rotatably coupled to the valve disc and selectively rotating the valve disc when the valve disc is coupled to the valve disc, the valve disc having a primary eccentricity in which a center of a flow path of the valve body is offset from a center of rotation of the valve disc, Wherein the inner surface of the valve seat ring includes a valve body having an inner surface on which an inner surface of the valve seat ring is connected to an outer surface of the valve body, And the other outer surface is disposed in contact with the retainer, and one or more elastic grooves are formed on the inner and outer surfaces of the valve seat ring, respectively.

The elastic groove is formed in at least one of the inner and outer surfaces of the valve seat ring, and the positions of the elastic grooves formed on the inner and outer surfaces are formed to have different radii from the center of the valve seat ring do.

The valve seat ring is integrally formed with the retainer, and the valve seat ring is formed with a pair of through holes passing through the inner and outer surfaces of the valve seat ring, The valve seat ring is fixed to the valve body by the position fixing pin.

In addition, the inner circumferential surface of the valve seat ring according to an embodiment of the present invention is formed in a curved shape in which a central portion thereof is recessed in a vertical section, and the outer circumferential surface of the valve disc is in the form of a curved line, Tight contact with the inner circumferential surface of the seat ring.

In addition, the inner circumferential surface of the valve seat ring according to another embodiment of the present invention is formed in a curved shape with its central portion protruding in its vertical section.

According to the present invention, since a plurality of elastic grooves are formed in the valve seat ring, when the valve seat ring is brought into contact with the valve disc, elasticity is applied to the valve seat ring, so that the pressure contact is made.

In addition, the resilient pressing contact increases the resistance against the pressure applied to the entire surface of the disk by the flow of the fluid in the reverse direction, that is, in the state where the valve disk is closed, thereby further enhancing the airtight effect.

In addition, since the valve seat ring and the retainer are integrally formed to reduce the number of workings during assembly, the productivity and the defective rate can be reduced.

Further, since the contact surface between the valve seat ring and the valve disc is formed as a curved surface rather than a straight surface, the airtightness is further improved.

1 is a view showing a conventional triple eccentric valve.
2 is a perspective view of a triple eccentric valve according to an embodiment of the present invention.
3 is an exploded perspective view of a triple eccentric valve according to an embodiment of the present invention.
4 is a front view of Fig.
5 is a cross-sectional view taken along line AA 'of FIG.
6 is a cross-sectional view taken along line BB 'of FIG.
7 is a view showing a valve disk according to an embodiment of the present invention.
8 is a view of a valve seat ring according to an embodiment of the present invention.
9 is a view showing a contact structure of a valve seat ring and a valve disk according to another embodiment of the present invention.
10 is a view showing a contact structure of a valve seat ring and a valve disc according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the sake of convenience, the size, line thickness, and the like of the components shown in the drawings referenced in the description of the present invention may be exaggerated somewhat. The terms used in the description of the present invention are defined in consideration of the functions of the present invention, and thus may be changed depending on the user, the intention of the operator, customs, and the like. Therefore, the definition of this term should be based on the contents of this specification as a whole.

FIG. 2 is a perspective view of a triple eccentric valve according to an embodiment of the present invention, FIG. 3 is an exploded perspective view of a triple eccentric valve according to an embodiment of the present invention, FIG. 4 is a front view of FIG. 1, 4 is a cross-sectional view taken along line AA 'of FIG. 4, and FIG. 6 is a cross-sectional view taken along line BB' of FIG.

FIG. 7 is a view showing a valve disk according to an embodiment of the present invention, and FIG. 8 is a view showing a valve seat ring according to an embodiment of the present invention.

Referring to the drawings, a triple eccentric valve 100 according to an embodiment of the present invention includes a valve body 20, a valve seat ring 30, a retainer 40, a valve disc 50, and a valve shaft 60 .

Here, the valve body 20 is formed with a circular cross-sectional passage at its center to guide the movement of fluid including water. The valve body 20 is configured to accommodate the valve seat ring 30, the retainer 40, and the valve disc 50 to interrupt the flow of the fluid in the through passage.

The valve seat ring 30 is fixed to the seating surface 21 of the valve body 20 in contact with the inner surface of the valve seat ring 30. The retainer 40 is disposed on the outer surface of the valve seat ring 30, Lt; / RTI >

In addition, the valve seat ring 30 can be integrally formed with the retainer 40, thereby reducing the number of assemblies when assembling the triple eccentric valve 100, and reducing the assembly failure rate .

The valve seat ring 30 is formed with a pair of through holes 32 passing through the inner and outer surfaces of the valve seat ring 30. The valve seat ring 30 is inserted into the valve body 20 through the through holes 32, 60, the valve seat ring 30 is fixed to the valve body 20.

The position fixing pin 60 may be formed so as to have substantially the same diameter as the through hole 32 and the through groove 22 of the valve body 20 so as to fix the valve seat ring 30 in a press- The outer circumferential edge of the positioning pin 60 may be threaded so as to be screwed into the through hole 32 and the inner groove of the through groove 22 of the valve body 20. [

The position fixing pin 60 may be configured to first penetrate the retainer 40 and then to be fixed to the through groove 22 of the valve body 20 through the through hole 32 of the valve seat ring 30, One side and the other side are positioned in the through hole 32 of the valve seat ring 30 and the through groove 22 of the valve body 20 so that the position between the valve seat ring 30 and the valve body 20 is fixed It is possible.

On the other hand, at least one elastic groove 32 is formed on the outer surface and the inner surface of the valve seat ring 30, and the elastic groove 31 is formed along the arc of the inner and outer surfaces of the valve seat ring 30 And their positions are formed to have different radii from the center of the valve seat ring 30, respectively.

In the case where two or more elastic grooves 32 are formed on the outer surface and the inner surface of the valve seat ring 30 and the nearest elastic grooves 32 are formed on the outer surface from the center of the valve seat ring 30, (32) are formed on the inner surface, and then the outer surface and the inner surface are alternately formed in order.

This is because the outer circumferential surface 53 of the valve disc 50 is formed on the inner circumferential surface of the valve seat ring 30 in such a manner that the elastic grooves 32 on the outer surface and the inner surface are alternately and gradually moved away from the center of the valve seat ring 30 So that the valve seat ring 30 is compressed toward the center line without bending inward or outward even when the valve seat 30 is pressed.

The valve seat ring 30 according to the present invention is preferably made of a metal material having elasticity, and more preferably, an inconel alloy containing nickel as a main component is adopted to minimize the reduction of elasticity at high temperature and high pressure, Corrosion and the like are minimized to prolong the life of the valve seat ring 30 and prevent deformation and damage.

The valve disc 50 is rotatably received in the through passage of the valve body 20 and has an outer circumferential surface in a through hole 31 formed in a central portion of the valve seat ring 30, 30, the through-flow passage is selectively opened or closed.

The valve disc 50 includes a connection rib 51 for allowing the valve disc 50 to rotate together with the valve shaft 60 when the valve shaft 60 rotates, And a disk 52 configured to selectively contact the inner circumferential surface to open and close the through passage.

Here, the inner circumferential surface of the valve seat ring 30 and the outer circumferential surface of the disk 52 may be formed to correspond to each other in shape so as to improve airtightness.

5 and 6, both ends of the inner circumferential surface of the valve seat ring 30 and the inclination of both ends of the outer circumferential surface of the valve disc 50 are different from each other to constitute the triple eccentricity, The inclination of the end closer to the opposite end is formed to be larger.

Accordingly, as the valve shaft 60 is rotated and restored at a predetermined angle, the valve disc 50 is in pressure contact with or disengaged from the valve seat ring 30, and the flow of the fluid is interrupted through the through passage.

The most important characteristic of the triple eccentric valve 100 according to the present invention is that the elastic groove 32 of the valve seat ring 30 allows the valve disc 50 and the valve seat 30, The contact between the rings 30 forms a press contact rather than a simple contact.

This pressure contact can withstand the forward or reverse pressure of the flow path to improve the airtight performance, where further the airtight effect is maximized as the pressure contacting surface constitutes a surface contact rather than a line contact.

FIG. 9 is a view showing a contact structure of a valve seat ring and a valve disc according to another embodiment of the present invention, and FIG. 10 is a view showing a contact structure of a valve seat ring and a valve disc according to another embodiment of the present invention .

The triple eccentric valve 100 according to the present embodiment forms a curved surface in which the inner circumferential surface end portion of the valve seat ring 30 and the outer circumferential surface 53 of the valve disc 50 are not straight, So that it can withstand more strongly.

Accordingly, when the flow rate of the fluid or the flow rate per unit time is large, the external pressure is large, so that the triple eccentric valve 100 according to the present embodiment can be effectively used.

The inner circumferential surface of the valve seat ring 30 according to the present embodiment is formed in a curved shape with its vertical section recessed at its center, and the outer circumferential surface 53 of the valve disc 50 in contact therewith has a curved shape So that airtight contact can be established as the valve seat ring 30 is shaped in correspondence with the inner circumferential surface of the valve seat ring 30.

Accordingly, even if the valve disc 50 is rotated by the external pressure, an external force greater than that of the above-described embodiment must be applied to rotate the valve disc 50.

The reason why the valve can be applied as a valve even when the contact area between the outer circumferential surface 53 of the valve disc 50 and the inner circumferential surface of the valve seat ring 30 increases and the frictional resistance according to the shape increases as in the present embodiment, This is because the valve seat ring 30 is elastically compressed or restored according to the formation of the elastic groove 32.

10, the valve seat ring 30 is formed in a curved shape with a protruding central portion, so that the valve seat ring 30 is pressed against the valve seat ring 30 as shown in FIG. 9, Line contact.

Accordingly, when the valve disc 50 rotates, the frictional resistance along the valve seat ring 30 is small, so that the valve disc 50 can be rotated even with a small force.

This valve seat ring 30 according to Fig. 10 is suitable for a case in which the external pressure is small, that is, in the case of a valve having a small amount of oil or a small flow rate.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

20: valve body 21: seat face
30: valve seat ring 31: through hole
32: elastic groove 33: through hole
40: retainer 50: valve disc
60: Position fixing pin 100: Triple eccentric valve

Claims

A valve body (20) having a circular cross section through passage formed at a central portion thereof;
A valve seat ring (30) disposed along an inner peripheral surface of the valve body (20) where a through passage is formed;
A retainer (40) disposed along the inner circumferential surface of the through passage of the valve body (20) and fixing the valve seat ring (30) according to an outer surface of the valve seat ring (30);
A valve seat ring 30 rotatably disposed in the through passage of the valve body 20 and having a through hole 31 formed at the center of the valve seat ring 30, A disk 50;
And a valve shaft (60) selectively received inside the valve body (20) to selectively rotate the valve disc (50) in association with the valve disc (50)
A first eccentric X in which the center of the flow path of the valve body 20 is offset from a center of rotation of the valve disc 50 and a second eccentricity X in which the center of the valve shaft 60 and the center of the valve disc 50 are displaced, (Y) and a third-order eccentric (Z) in which the center of the flow path of the valve body (20) is displaced from a point where an extension line of both outer peripheral surfaces of the valve disc (50)
The inner surface of the valve seat ring 30 is in contact with the seating surface 21 formed on the inner circumferential surface of the valve body 20 and the outer surface of the valve seat ring 30 is disposed in contact with the retainer 40, Wherein at least one elastic groove (32) is formed on an inner surface and an outer surface of the valve seat ring (30), respectively.

The method according to claim 1,
The elastic groove path 32 is formed at least one in each of the circular arc on the inner surface and the outer surface of the valve seat ring 30. The position of the elastic groove path 32 formed on the inner surface and the outer surface of the valve seat ring 30, , Respectively, of the elastic member (20) are formed to have different radii from the center of the triple eccentric valve.

3. The method of claim 2,
The valve seat ring 30 is integrally formed with the retainer 40. The valve seat ring 30 is formed with a pair of through holes 33 penetrating the inner and outer surfaces of the valve seat ring 30 And the valve seat ring (30) is fixed to the valve body (20) by a position fixing pin (60) inserted through the through hole (33) and inserted into the valve body Triple Eccentric Valve with Structure.

The method of claim 3,
The inner circumferential surface of the valve seat ring 30 is formed in a curved shape with its central vertical section being recessed, and the outer circumferential surface of the valve disc 50 in contact therewith is formed in a curved shape with its vertical cross- 30), and the airtight contact is made to correspond to the inner peripheral surface of the triple eccentric valve.

The method of claim 3,
Wherein the inner circumferential surface of the valve seat ring (30) is formed in a curved shape with its vertical section projecting at its center.