KR102236693B1 - butterfly valve with expandable packing structure - Google Patents

Abstract

The present invention relates to a butterfly valve having a flexible packing structure, which is to stably and reliably achieve airtightness. The butterfly valve of the present invention comprises: a valve body for forming a flow passage; a fixed flange; a valve disk installed in the valve body; a flexible flange; a flexible packing gland; a flexible packing interposed between the flexible flange and the flexible packing gland; and a fastening unit for firmly coupling the flexible flange and the flexible packing gland.

Description

Butterfly valve with expandable packing structure

The present invention relates to a butterfly valve having an expandable packing structure, and more particularly, a valve body provided in a cylindrical shape to form a flow path inside, and a valve body transverse to the flow path so as to rotate and open the flow path. It includes a valve disk that is built up in the valve and a fixed flange integrally formed at an outer diameter end of one side of the valve body, and the distance between the faces between the flange provided on the opposite side and the fixed flange is adjusted to be symmetrical to the fixed flange. There is no need to cut the valve separately, and it is possible to ensure that airtightness is stably and surely achieved by adopting an expandable packing structure, and it is installed in a sturdy fastening structure, so that the butterfly valve has a telescopic packing structure that can show excellent water resistance. About.

In general, a butterfly valve is composed of a hollow valve body, a disk rotatably installed inside the valve body, and a driving unit that controls the flow of fluid by rotating the disk. It is generally configured to include a handle mounted outside the valve body so that it can be manipulated.

In such a butterfly valve, the watertightness between the inner circumferential surface of the valve body and the outer circumferential surface of the disk in contact with each other is very important. This is because if the watertightness between the inner circumferential surface of the valve body and the outer circumferential surface of the disk is poor, the fluid leaks.

In the conventional butterfly valve, as shown in FIG. 1, a separate body sheet is formed on the inner circumferential surface of the valve body 10 that is directly connected to the pipe, and the body sheet and the outer circumferential surface of the disk 20 are in close contact with each other. The flow path formed inside the valve body 10 is opened and closed. At this time, a seat ring made of a rubber material may be further attached to the inner circumferential surface of the body sheet or the outer circumferential surface of the disk 20 in contact with each other in order to improve watertightness.

An example of a butterfly valve according to the prior art is disclosed in Korean Utility Model Registration No. 20-0406344 (registered on January 10, 2006, hereinafter referred to as'Patent Document 1').

However, such a conventional sealing structure has a problem in that water tightness may be deteriorated because the flow of fluid passing through the flow path is opened and closed by a body seat mounted on the inner circumferential surface of the valve body and a disk in contact with the body seat.

In addition, there is a problem in that the repetitive opening and closing operation causes frequent contact between the body sheet and the disk, and such contact causes deterioration and deformation of the outer peripheral surface of the body sheet and the disk, so that the initial sealing effect may not be maintained.

Republic of Korea Utility Model Registration No. 20-0406344 (registered on January 10, 2006)

An object of the present invention is a valve body provided in a cylindrical shape to form a flow path inside, a valve disk installed in the valve body in a transverse direction to the flow path so as to rotate and open the flow path, and an outer diameter end of one side of the valve body. It includes a fixed flange formed integrally, but the distance between the faces between the flange provided on the opposite side and the fixed flange is adjusted to be symmetrical to the fixed flange, so there is no need to cut the pipe separately when replacing or installing the valve, and adopts a telescopic packing structure. It is to provide a butterfly valve with a telescopic packing structure that can ensure that airtightness is stably and surely achieved, and is installed with a sturdy fastening structure to exhibit excellent water-repellent performance.

In order to achieve the above object, a butterfly valve having an expandable packing structure according to the present invention includes: a valve body provided in a cylindrical shape to form a flow passage inside; A fixing flange integrally formed at one end of the outer diameter of the valve body; A valve disk installed in the valve body in a transverse direction to the flow path so as to rotate and open the flow path; A telescopic flange which is symmetrically fitted to the fixed flange by slidingly fitted to the other end of the outer diameter of the valve body so as to be detachably coupled to the fixed flange so that the distance between the fixed flange and the fixed flange is adjustable; A telescopic packing gland that is first fitted into the valve body before the telescopic flange is fitted into the valve main body and coupled to the outer diameter end of the other side of the valve main body together with the telescopic flange; A telescopic packing interposed between the telescopic flange and the telescopic packing gland to ensure airtightness; And a fastening unit that is fastened to a circumferential portion of the elastic flange and the elastic packing gland so that the elastic flange and the elastic packing gland are firmly coupled to each other.

Here, the expansion and contraction packing is provided in the form of a ring having a pressing groove in a'V' shape toward the expansion and contraction flange in cross section, and the expansion and contraction flange is formed on one surface facing the expansion and contraction packing, and a pressing wedge portion protrudes toward the pressing groove. When the elastic packing gland is coupled, the pressing groove of the elastic packing interposed between the elastic packing gland is pressed so that the outer diameter of the elastic packing is expanded, and the elastic packing gland supports the elastic flange. It is preferable that the packing seating groove is recessed so that the elastic packing is inserted and seated on one side facing.

In addition, the fastening unit includes an anti-loosening bolt fixedly coupled to the telescopic flange through the telescopic packing gland, and the telescopic packing gland in the anti-loosening bolt after the anti-loosening bolt is fixedly coupled to the telescopic flange. A nut holder coupled to a portion exposed to the outside of the nut holder, a nut coupled to the nut holder to prevent loosening, and after the nut is coupled to the nut holder, the nut holder is coupled to the nut holder so that the nut holder is the loosening prevention bolt It is preferable to include a snap ring to prevent separation from and off.

According to the present invention, a valve body provided in a cylindrical shape and forming a flow path inside, a valve disk installed in the valve body in a transverse direction to the flow path so as to rotate and open the flow path, and an outer diameter end of one side of the valve body integrally It includes a fixed flange formed with a fixed flange, but the distance between the faces between the fixed flange and the flange provided on the opposite side to be symmetrical to the fixed flange is adjusted so that there is no need to cut the pipe separately when replacing or installing the valve, and by adopting the telescopic packing structure, it is airtight. It is possible to provide a butterfly valve having a telescopic packing structure that can be made to be stably and surely achieved, and is installed in a sturdy fastening structure so that excellent water-repellent performance can be exhibited.

1 is a perspective view showing an example of a butterfly valve according to the prior art;
Figure 2 is a side cross-sectional view of a butterfly valve having a telescopic packing structure according to the present invention,
FIG. 3 is an enlarged view of area “A” of FIG. 2;
Figure 4 is a side cross-sectional view and a front view of the expansion flange according to the present invention,
Figure 5 is a side cross-sectional view and a front view of the expansion packing gland according to the present invention,
Figure 6 is a side cross-sectional view of the expansion packing according to the present invention,
7 is a side view and a front cross-sectional view of the anti-loosening bolt according to the present invention,
8 is a front view of a nut holder according to the present invention.

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

The butterfly valve having an expandable packing structure according to the present invention, as shown in Figs. 2 and 3, the valve body 100, the fixed flange 110, the valve disk 200, and the expansion flange ( 300), and the expansion packing gland 400, the expansion packing 500, and a fastening unit 600.

As shown in FIG. 2, the valve body 100 is provided in a cylindrical shape and penetrated in a horizontal structure to induce the flow of various flowing substances, such as a fluid such as water or a gas such as gas. ) To form.

Here, the valve body 100 may be provided with a power motor, a gear box, an operation handle, etc. as a driving means or a driving control means for controlling the rotational opening and closing of the valve disk 200 on the outside.

The valve body 100 may be made of cast iron or stainless steel cast steel when used for low pressure depending on its intended use, and may be made of spheroidal graphite cast iron or cast steel when used for medium/high pressure.

The fixing flange 110 is integrally formed at the end of the outer diameter of one side of the valve body 100, as shown in FIG. 2.

At this time, it is preferable that the expansion and contraction installation part 103 is formed in a stepped shape so that the outer diameter is slightly reduced on the outer circumferential surface of the opposite end of the valve body 100 on which the fixing flange 110 is formed.

Accordingly, the expansion flange 300, the expansion packing gland 400, and the expansion packing 500 may be easily fitted to the expansion and contraction installation part 103 so that the valve body 100 may be easily installed.

As shown in FIG. 2, the valve disk 200 is installed in the valve body 100 in the transverse direction to the flow passage 101 so as to rotate and open the flow passage 101.

More specifically, the valve disk 200 forms a circular plate-shaped body, and a rotation shaft 210 is connected to the central portion thereof.

As shown in Figs. 2 and 3, the expansion flange 300 is fitted in a sliding manner to the other end of the outer diameter of the valve body 100 so as to be symmetrical to the fixed flange 110, and is detachably coupled to the fixed flange 110. The distance between the and is adjustable.

Accordingly, the interplanar distance between the expansion flange 300 and the fixed flange 110 provided on the opposite side symmetrically to the fixed flange 110 is provided so that it is possible to easily work without cutting a separate pipe when replacing or installing a valve. You can make this happen.

The expansion and contraction packing gland 400, as shown in FIGS. 2 and 3, is first fitted into the valve body 100 before the expansion and contraction flange 300 is fitted into the valve body 100 and is coupled to the expansion and contraction flange 300. It is coupled to the other end of the outer diameter of the valve body 100 together.

The elastic packing 500, as shown in FIG. 3, is made of an elastic material such as rubber, and is interposed between the expansion flange 300 and the expansion packing gland 400 so that airtightness is achieved.

The fastening unit 600, as shown in Figure 3, is fastened to the circumferential portion of the expansion flange 300 and the expansion packing gland 400 so that the expansion flange 300 and the expansion packing gland 400 are firmly Let it be combined.

Accordingly, the distance between the faces between the telescopic flange 300 and the fixed flange 110 provided on the opposite side symmetrically to the fixed flange 110 is adjusted so that the pipe does not need to be cut separately when the valve is replaced or installed, and the telescopic packing By adopting a structure, it is possible to ensure that airtightness is stably and surely achieved, and it is possible to provide a butterfly valve having a telescopic packing structure that can be installed with a sturdy fastening structure to exhibit excellent water-stop performance.

As an embodiment of the present invention, as shown in Figs. 3 to 6, the elastic packing 500 is in the form of a ring having a'V'-shaped pressing groove 510 toward the expansion flange 300 in cross section. It is provided, and the expansion flange 300 has a pressing wedge part 310 protruding toward the pressing groove 510 on one surface facing the expansion packing 500, and when combined with the expansion packing gland 400, the expansion packing gland ( By pressing the pressing groove 510 of the expansion packing 500 interposed between the 400) and the outer diameter of the expansion packing 500 is expanded, the expansion packing gland 400 is on one side facing the expansion flange 300 It is preferable that the packing seating groove 410 is recessed so that the elastic packing 500 is inserted and seated.

Accordingly, when the expansion flange 300 and the expansion packing gland 400 are coupled by the fastening unit 600, the expansion packing 500 interposed between the expansion flange 300 and the expansion packing gland 400 It is pressed by pressure to both sides by the expansion flange 300 and the expansion packing gland 400, and in particular, the pressed wedge part 310 of the expansion flange 300 has a'V' shape cross section of the expansion packing 500 The pressing groove 510 forming the shape is pressed and the pressing groove 510 is gradually wider so that the airtightness can be safely maintained even if a high pressure is applied to the butterfly valve.

Here, as shown in FIG. 4, it is preferable that the pressed wedge portion 310 is not sharply formed to the end in cross-section, and the end is slightly bluntly formed in a shape having a cut surface.

On the other hand, the fastening unit 600, as shown in Figure 3, through the expansion packing gland 400, the loosening prevention bolt 610 fixedly coupled to the expansion flange 300, and the loosening prevention bolt 610 After being fixedly coupled to the expansion flange 300, the nut holder 620 coupled to the portion exposed to the outside of the expansion packing gland 400 from the loosening prevention bolt 610, and the nut holder 620 prevents loosening. The nut 630 is coupled to the nut 630 and the nut 630 is coupled to the nut holder 620 and then coupled to the nut holder 620 to prevent the nut holder 620 from being separated and separated from the loosening prevention bolt 610. Includes a snap ring (640).

Accordingly, the coupling between the expansion flange 300 and the expansion packing gland 400 is installed in a rigid fastening structure, so that excellent water-repellent performance may be displayed.

On the other hand, as shown in Figures 3 and 4 (b), the expansion flange 300 is a bolt fastening portion 320 is formed at regular intervals to be fastened by fitting an anti-loosening bolt 610 to the circumferential portion of the outer extended portion 3 and 5(b), the elastic packing gland 400 is fitted with an anti-loosening bolt 610 at a position corresponding to the bolt fastening part 320 so that the bolt fastening part 320 It is preferable that the bolt fastening hole 420 to be fastened through through is formed through.

At this time, it is preferable to perform a lock tight treatment at a portion inserted and fastened from the loosening prevention bolt 610 to the bolt fastening part 320.

Accordingly, after the loosening prevention bolt 610 is fastened to the bolt fastening part 320, it can be prevented from being easily loosened.

In addition, as shown in FIG. 7, a key groove 611 is formed on one side of the outer surface of the loosening prevention bolt 610, and as shown in FIG. 8, a key groove 611 is formed on the inner diameter of the nut holder 620. It is preferable that the key protrusion 621 engaged with the) is formed to protrude.

Accordingly, it is possible to forcibly prevent the loosening of the nut 630 in the loosening prevention bolt 610, and the nut holder 620 is secured by the snap ring 640 so that it does not slide out of the loosening prevention bolt 610. It can be made to be united.

On the other hand, as shown in Figure 6, in the elastic packing 500 according to the present invention, in the innermost center where the pressing groove 510 is formed in the side cross-sectional shape, an elastic reinforcing groove (groove) in an approximately circular arc shape ( 520) is formed.

Accordingly, when the pressing wedge portion 310 is pressed, the pressing groove 510 is more easily opened by the elastic reinforcing groove 520 so that the outer diameter of the elastic packing 500 can be expanded more easily, When the pressure of the pressed wedge portion 310 is relieved, the pressed groove 510 can be contracted by rapid restoration, and the elastic packing 500 may not be torn or damaged in the pressed groove 510 even with repeated elongation and contraction. can do.

Although the technical aspects have been described above and in the accompanying drawings, the technical idea of the present invention is for the purpose of explanation, and is not limited thereto, and those having ordinary technical knowledge in the technical field of the present invention It will be appreciated that the present invention can be variously modified and changed without departing from the technical scope of the claims to be described later.

100: valve body 101: flow passage
103: new installation part 110: fixed flange
200: valve disc 210: rotating shaft
300: expansion flange 310: pressed wedge
320: bolt fastening part 400: expansion packing gland
410: packing seating groove 420: bolt fastening hole
500: expansion packing 510: pressed groove
520: elastic reinforcement groove 600: fastening unit
610: anti-loosening bolt 611: key groove
620: nut holder 621: key projection
630: nut 640: snap ring

Claims (3)

A valve body 100 provided in a cylindrical shape and forming a flow passage 101 inside;
A fixing flange 110 integrally formed at one end of the outer diameter of the valve body 100;
A valve disk 200 installed in the valve body 100 in a transverse direction to the flow path 101 so as to rotate and open the flow path 101;
A telescopic flange 300 which is symmetrically fitted with the fixed flange 110 to the other end of the outer diameter of the valve body 100 in a sliding manner so as to be detachably coupled to the fixed flange 110 so that the distance between the fixed flange 110 and the fixed flange 110 is adjustable;
Before the expansion flange 300 is fitted into the valve body 100, it is first fitted and coupled to the valve body 100, and the expansion and contraction coupled to the other end of the outer diameter of the valve body 100 together with the expansion flange 300 Packing gland 400;
A telescopic packing 500 interposed between the telescopic flange 300 and the telescopic packing gland 400 to ensure airtightness; And
A fastening unit 600 that is fastened to the circumferential portion of the elastic flange 300 and the elastic packing gland 400 so that the elastic flange 300 and the elastic packing gland 400 are firmly coupled;
Including,
The elastic packing 500 is provided in the form of a ring having a'V'-shaped pressing groove 510 toward the expansion flange 300 in cross section, and the expansion flange 300 includes the elastic packing 500 The pressing wedge part 310 protrudes toward the pressing groove 510 on one side facing the expansion packing 500 interposed between the expansion packing gland 400 when combined with the expansion packing gland 400 ) By pressing the pressing groove 510 of the expansion and contraction packing 500 so that the outer diameter of the expansion and contraction packing 500 is expanded, and the expansion and contraction packing gland 400 is inserted into one surface facing the expansion and contraction flange 300 The packing seating groove 410 is recessed to be seated,
The fastening unit 600 includes an anti-loosening bolt 610 fixedly coupled to the expansion flange 300 through the expansion packing gland 400, and the loosening prevention bolt 610 is the expansion flange 300 ) After being fixedly coupled to the nut holder 620 that is coupled to the portion exposed to the outside of the elastic packing gland 400 from the loosening prevention bolt 610, and the nut holder 620 to prevent loosening. After the nut 630 is coupled to the nut holder 620 and the nut 630 is coupled to the nut holder 620, the nut holder 620 is separated and separated from the loosening prevention bolt 610. Includes a snap ring 640 to prevent,
The elastic reinforcing groove 520 is formed in a circular arc shape in the innermost center where the pressing groove 510 starts to be formed in the side cross-section of the elastic packing 500,
Lock-tight treatment is performed at the portion inserted and fastened from the loosening prevention bolt 610 to the bolt fastening part 320,
A key groove 611 is formed on one side of the outer surface of the loosening prevention bolt 610, and a key protrusion 621 engaged with the key groove 611 is protruded in the inner diameter of the nut holder 620. Butterfly valve with a flexible packing structure.

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