KR102366828B1 - butterfly valve with expandable packing structure and composite seat structure - Google Patents

Abstract

The present invention relates to a butterfly valve having an expandable packing structure and a composite seat structure, which can stably and reliably secure airtightness, comprising: a valve body for forming a flow passage; a fixed flange; a valve disk installed in the valve body; an expandable flange; an expandable packing gland; an expandable packing; a fastening unit; a composite seat provided to have a conical cross section; and a conical body seat.

Description

Butterfly valve with expandable packing structure and composite seat structure {butterfly valve with expandable packing structure and composite seat structure}

The present invention relates to a butterfly valve having a telescopic packing structure and a composite seat structure, and more particularly, a valve body provided in a cylindrical shape to form a flow passage inside, and a flow passage to rotate and open and close the flow passage. It includes a valve disk axially installed on the valve body and a fixed flange integrally formed on the outer diameter end of one side of the valve body. It can be easily repaired so that no leaks occur even if it occurs, and the distance between the flange and the fixed flange, which is provided symmetrically on the opposite side of the fixed flange, is adjusted, so that there is no need to separately cut the pipe when replacing or installing the valve. It relates to a butterfly valve having a flexible packing structure and a composite seat structure that can ensure that airtightness is achieved stably and reliably by adopting the

In general, a butterfly valve is composed of a hollow valve body, a disk rotatably installed inside the valve body, and a drive unit that rotates the disk to control the flow of fluid, and the drive unit connects the shaft and the shaft, which are the rotating shafts of the disk. It is common to include a handle mounted on the outside of the valve body so that it can be operated.

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 not good, 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 directly connected to the pipe, and the outer circumferential surface of the body sheet and 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 using 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 Republic of Korea Utility Model Registration No. 20-0406344 (registered on January 10, 2006, hereinafter referred to as 'Patent Document 1') and the like.

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 simply opened and closed by the body seat mounted on the inner circumferential surface of the valve body and the disk in contact with the body seat.

In addition, the repeated 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 passage inside, a valve disk axially installed on the valve body in a horizontal direction to a flow passage to rotate and open and close the flow passage, and at one end of the outer diameter of the valve body Including a fixed flange integrally formed, but equipped with a composite seat on the outer peripheral surface of the outer end of the valve disk to ensure perfect water retention performance, can be easily repaired to prevent leakage even after long-term use, and symmetrically to the fixed flange The face-to-face distance between the provided flange and the fixed flange is adjusted, so there is no need to separately cut the pipeline when replacing or installing the valve. It is to provide a butterfly valve having a telescopic packing structure and a composite seat structure capable of exhibiting excellent water performance.

In order to achieve the above object, a butterfly valve having a telescopic packing structure and a composite seat 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 with an outer diameter end of one side of the valve body; a valve disk axially installed on the valve body in a transverse direction to the flow passage to pivotally open and close the flow passage; a telescopic flange fitted to the other outer diameter end of the valve body symmetrically to the fixed flange in a sliding manner and detachably coupled thereto so that the separation distance from the fixed flange is adjustable; an expansion and contraction packing gland which is first fitted into the valve body before the expansion flange is fitted into the valve body and is coupled to the other outer diameter end of the valve body together with the expansion flange; Expansion packing to be interposed between the expansion flange and the expansion sealing gland to achieve airtightness; a fastening unit which is fastened to a peripheral portion of the expansion and contraction flange and the expansion and contraction packing gland so that the expansion and contraction flange and the expansion and contraction packing gland are firmly coupled; a composite seat provided to have a conical cross section on an outer peripheral portion facing the expansion and contraction flange from the valve disk when the valve disk is rotated and closed; and a conical body seat provided to have a conical cross section symmetrical to the conical cross section of the composite seat on the inner circumferential surface of the valve body so as to be in close contact with the outer circumferential surface of the composite seat when the valve disk is rotated and closed. characterized.

Here, the composite seat includes a conical metal sheet provided to have a conical cross section around the outer end of the valve disk, and a conical rubber sheet provided to have a conical cross section on the outside of the conical metal sheet, and the conical shape Conical seat gland provided to have a conical cross section on the outside of the rubber seat and pressurizing the conical rubber sheet interposed between the conical metal seat and the valve disk when combined with the conical metal sheet it is preferable

And, the expansion and contraction packing is provided in the form of a ring having a 'V'-shaped pressing groove toward the expansion flange in cross section, and the expansion flange is formed with a wedge pressed toward the pressing groove on one surface facing the expansion and contraction packing. and presses the pressing groove of the telescopic packing interposed between the telescopic packing gland and the telescopic packing gland when combined with the telescopic packing gland so that the outer diameter of the telescopic packing is expanded, and the telescopic packing gland has the telescopic flange It is preferable that the packing seating groove is recessed so that the elastic packing is inserted and seated on one surface facing.

According to the present invention, a valve body provided in a cylindrical shape to form a flow passage inside, a valve disk axially installed on the valve body in a horizontal direction to the flow passage so as to rotate and open and close the flow passage, and one end of the outer diameter of the valve body It includes a fixed flange formed of The face-to-face distance between the flange and the fixed flange is adjusted so that there is no need to separately cut the pipe when replacing or installing the valve. It is possible to provide a butterfly valve having a telescopic packing structure and a composite seat structure capable of exhibiting excellent water resistance performance.

1 is a perspective view showing an example of a butterfly valve according to the prior art;
2 is a side cross-sectional view of a butterfly valve having a telescopic packing structure and a composite seat structure according to the present invention;
3 is an enlarged view of area “A” of FIG. 2;
4 is an enlarged view of the “B” area of FIG. 2;
5 is a side cross-sectional view and a front view of the expansion flange according to the present invention;
6 is a side cross-sectional view and a front view of the expansion and contraction packing gland according to the present invention;
7 is a side cross-sectional view of the elastic packing according to the present invention;
8 is a side view and a front cross-sectional view of an anti-loosening bolt according to the present invention;
9 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.

A butterfly valve having a telescopic packing structure and a composite seat structure according to the present invention, as shown in FIGS. 2 to 4 , includes a valve body 100 , a fixing flange 110 , and a valve disk 200 . And, the expansion flange 300, the expansion and contraction packing gland 400, the expansion packing 500, the fastening unit 600, the composite sheet 700, and the conical body sheet (800).

As shown in FIG. 2 , the valve body 100 is provided in a cylindrical shape and passes through the flow passage 101 in a horizontal structure to induce the flow of various fluid materials, for example, a fluid such as water or a gas such as a gas. ) to form

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

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

The fixing flange 110 is integrally formed with the outer diameter end 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 such that the outer diameter is slightly reduced on the outer peripheral 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 can be easily fitted to the expansion and contraction installation part 103 to be easily installed in the valve body 100 .

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

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 symmetrically fitted to the other outer diameter end of the valve body 100 in a sliding manner and is detachably coupled to the fixing flange 110 . The distance between the and is provided to be adjustable.

Accordingly, the distance between the surfaces between the expansion and contraction flange 300 and the fixed flange 110 provided on the opposite side of the fixed flange 110 symmetrically is adjustable so that it is easy to work without separately cutting the pipe when replacing or installing the valve. can make this happen.

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

As shown in FIG. 3 , the expansion packing 500 is made of an elastic material such as rubber and is interposed between the expansion flange 300 and the expansion packing gland 400 to achieve airtightness.

The fastening unit 600, as shown in FIG. 3, is fastened to the periphery 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 attached. to be combined.

The composite seat 700, as shown in FIGS. 2 and 4, has a conical cross section on the outer periphery of the valve disk 200 toward the expansion and contraction flange 300 when the valve disk 200 is rotated and closed. provided

The conical body seat 800 is, as shown in FIGS. 2 and 4, the composite seat 700 on the inner peripheral surface of the valve body 100 so as to be in close contact with the outer peripheral surface of the composite seat 700 when the valve disk 200 is rotated and closed. ) is provided to have a conical cross section that is symmetrical with the conical cross section.

Accordingly, the composite seat 700 is provided on the outer circumferential surface of the outer end of the valve disk 200 so that water retention performance is perfect, and it can be easily repaired to prevent leakage even after long-term use, and is symmetrical to the fixing flange 110 . The distance between the facets between the expansion flange 300 and the fixed flange 110 provided on the opposite side is adjusted so that it is not necessary to separately cut the pipe when replacing or installing the valve. It is possible to provide a butterfly valve having a flexible packing structure and a composite seat structure that can be installed with a strong fastening structure to exhibit excellent water-holding performance.

As an embodiment of the present invention, the composite seat 700, as shown in FIG. 4, a conical metal sheet 710 provided to have a conical cross section around the outer end of the valve disk 200, and a conical shape A conical rubber sheet 720 provided to have a conical cross section on the outside of the metal sheet 710, and a conical rubber sheet 720 provided to have a conical cross section on the outside of the conical rubber sheet 720, the valve disk 200 and the conical metal sheet It is preferable to include a conical seat gland 730 that presses and presses the conical rubber sheet 720 interposed between the conical metal sheet 710 when combined with the 710 .

Accordingly, even if a slight leak occurs in the conical metal sheet 710, the conical rubber sheet 720 on the back side of the conical metal sheet 710 completely suppresses the leakage, so that the conical metal sheet 710, the conical rubber sheet 720 ) and the conical seat gland 730, the composite sheet 700 is configured so that the water-resistance performance is perfect.

Here, the conical seat gland 730, the conical rubber seat 720 and the conical metal seat 710, and the fastening bolt 740 so that they are firmly coupled to the valve disk 200 are the conical seat gland 730, It is preferably fastened to the valve disk 200 across the conical rubber seat 720 and the conical metal seat 710 .

Accordingly, even if water leakage occurs due to long-term use, the fastening bolt 740 is simply tightened and the conical seat gland 730 presses the conical rubber sheet 720 more closely, so that leakage does not occur even after long-term use Maintenance work can be done easily to avoid it.

On the other hand, as shown in FIG. 4 , the first packing material 750 in the form of an O-ring is interposed between the valve disk 200 and the composite seat 700 in the valve disk 200 . A seating groove in which the packing material 750 is installed is recessed, and the first packing material 750 is seated and installed in the seating groove, and the first packing material 750 is installed between the valve disk 200 and the conical metal seat 710. ) is preferably provided.

Accordingly, the watertight structure between the valve disk 200 and the composite seat 700 by the first packing material 750 can be made more firmly.

On the other hand, as shown in FIG. 4, the conical body seat 800 has a second packing material such that an O-ring-shaped second packing material 810 is interposed between the conical body seat 800 and the inner circumferential surface of the valve body 100. A seating groove in which the 810 is installed is recessed, and the second packing material 810 is seated and installed in the seating groove, so that the second packing material 810 is installed between the conical body seat 800 and the valve body 100 . It is desirable to have it available.

Accordingly, the watertight structure between the valve body 100 and the conical body seat 800 by the second packing material 810 can be made more firmly.

On the other hand, as an embodiment of the present invention, as shown in FIGS. 3 and 7 , the expansion and contraction packing 500 is a ring having a 'V'-shaped pressing groove 510 toward the expansion and contraction flange 300 in cross section. 3 and 5, the expansion flange 300 is pressed toward the pressing groove 510 on one surface facing the expansion and contraction packing 500, the wedge portion 310 is formed to protrude and the expansion and contraction packing When combined with the gland 400, the pressing groove 510 of the telescopic packing 500 interposed between the telescopic packing gland 400 is pressed so that the outer diameter of the telescopic packing 500 is expanded, and Figs. 6, it is preferable that the packing seating groove 410 is recessed so that the expansion and contraction packing 500 is inserted and seated on one surface of the expansion and contraction packing gland 400 facing the expansion flange 300.

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 is It is pressed by pressing on both sides by the expansion flange 300 and the expansion packing gland 400, and in particular, the pressing wedge part 310 of the expansion flange 300 is a 'V' shaped cross section of the expansion packing 500. By pressing the pressing groove 510 forming the shape, the pressing groove 510 is gradually widened so that airtightness can be safely maintained even when a high pressure is applied to the butterfly valve.

Here, as shown in FIG. 5 , the pressing wedge 310 is not formed sharply to the end in cross-section, but is preferably formed slightly bluntly in the form of having a cut surface.

On the other hand, the fastening unit 600, as shown in FIG. 3, penetrates the expansion and contraction packing gland 400 and is fixedly coupled to the expansion flange 300 with an anti-loosening bolt 610 and an anti-loosening 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 and contraction packing gland 400 from the loosening prevention bolt 610 and the nut holder 620 are prevented from loosening After the nut 630 is coupled to the nut holder 620 and the nut 630 is coupled to the nut holder 620, it is coupled to the nut holder 620 to prevent the nut holder 620 from being separated from the loosening prevention bolt 610. and a snap ring 640 .

Accordingly, the coupling between the expansion and contraction flange 300 and the expansion and contraction packing gland 400 is installed in a strong fastening structure, so that excellent water performance can be exhibited.

On the other hand, as shown in FIGS. 3 and 5 (b), the expansion and contraction flange 300 has a bolt fastening part 320 to which a loosening prevention bolt 610 is fitted and fastened to the periphery of the outer edge extension part is formed at regular intervals. As shown in FIGS. 3 and 6 (b), the expansion and contraction packing gland 400 is fitted with an anti-loosening bolt 610 at a position corresponding to the bolt fastening part 320, and the bolt fastening part 320. It is preferable that the bolt fastening hole 420 to be through-fastened toward the is formed through.

At this time, it is preferable to perform a lock-tight treatment on the 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. 8 , a key groove 611 is formed on one side of the outer surface of the loosening prevention bolt 610 , and as shown in FIG. 9 , the 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 protrusion is formed.

Accordingly, the loosening of the nut 630 from the anti-loosening bolt 610 can be forcibly prevented, and the snap ring 640 prevents the nut holder 620 from sliding off the anti-loosening bolt 610. can make it tied.

On the other hand, as shown in FIG. 7, in the innermost center where the pressing groove 510 starts to be formed on the side cross-section in the expansion and contraction packing 500 according to the present invention, an elastic reinforcing groove in an approximately circular arc shape (groove) ( 520) is formed.

Accordingly, when pressing by the pressing wedge 310, the pressing groove 510 is more easily opened by the elastic reinforcing groove 520, so that the expansion of the outer diameter of the elastic packing 500 can be made more easily, When the pressure of the pressing wedge 310 is relieved, the pressing groove 510 can be contracted by rapid restoration, and the expansion and contraction packing 500 is not torn or damaged in the pressing groove 510 part even after repeated stretching 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 description, and does not limit the invention, and those of ordinary skill in the art It will be understood that various modifications and changes of the present invention can be made without departing from the technical scope of the present invention as set forth in the claims to be described below.

100: valve body 101: flow passage
103: telescopic installation part 110: fixed flange
200: valve disk 210: axis of rotation
300: expansion flange 310: pressed wedge part
320: bolt fastening part 400: expansion packing gland
410: packing seating groove 420: bolt fastening hole
500: expansion packing 510: pressing groove
520: elastic reinforcement groove 600: fastening unit
610: anti-loosening bolt 611: key groove
620: nut holder 621: key turning
630: nut 640: snap ring
700: composite sheet 710: conical metal sheet
720: conical rubber sheet 730: conical seat gland
740: fastening bolt 750: first packing material
800: conical body sheet 810: second packing material

Claims (3)

a valve body 100 provided in a cylindrical shape to form a flow passage 101 inside;
a fixing flange (110) integrally formed with an outer diameter end of one side of the valve body (100);
a valve disk 200 axially installed on the valve body 100 in a horizontal direction to the flow passage 101 so as to open and close the flow passage 101 by rotation;
Expansion flange 300 that is fitted in a sliding manner to the other outer diameter end of the valve body 100 symmetrically to the fixing flange 110 and is detachably coupled to the fixing flange 110 so that the separation distance from the fixing flange 110 is adjustable;
Before the expansion flange 300 is fitted into the valve body 100, it is first fitted into the valve body 100 and coupled to the other side outer diameter end of the valve body 100 together with the expansion flange 300. packing gland 400;
Expansion packing 500 which is interposed between the expansion flange 300 and the expansion packing gland 400 so that airtightness is achieved;
A fastening unit 600 that is fastened to the periphery 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 coupled;
a composite seat 700 provided to have a conical cross section on the outer peripheral portion of the valve disk 200 toward the expansion and contraction flange 300 when the valve disk 200 is rotated and closed; and
To have a conical cross section symmetrical to the conical cross section of the composite seat 700 on the inner circumferential surface of the valve body 100 so as to be in close contact with the outer circumferential surface of the composite seat 700 when the valve disk 200 is rotated and closed. Conical body sheet 800 provided;
including,
The composite seat 700 includes a conical metal sheet 710 provided to have a conical cross section around the outer end of the valve disk 200, and a conical cross section on the outside of the conical metal sheet 710. The conical rubber sheet 720 provided to have, and the conical metal sheet provided to have a conical cross section on the outside of the conical rubber sheet 720, when combined with the valve disk 200 and the conical metal sheet 710, the conical metal sheet It includes a conical seat gland 730 that presses and presses the conical rubber sheet 720 interposed between it and 710,
The expansion and contraction 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 is the expansion and contraction packing 500 . A pressing wedge 310 is formed to protrude toward the pressing groove 510 on one surface facing, and the elastic packing 500 interposed between the elastic packing gland 400 and the elastic packing gland 400 when combined with the elastic packing gland 400 ) so that the outer diameter of the elastic packing 500 is expanded by pressing the pressing groove 510 of the telescopic packing 500, the telescopic packing gland 400 is inserted into the telescopic packing 500 on one surface facing the expansion flange 300 A packing seating groove 410 is recessed to be seated,
The fastening unit 600 includes an anti-loosening bolt 610 that passes through the telescopic packing gland 400 and is fixedly coupled to the telescopic flange 300 , and the anti-loosening bolt 610 includes the telescoping flange 300 . ) and then the nut holder 620 coupled to the portion exposed to the outside of the expansion and contraction 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 holder 620 is coupled to the nut holder 620, the nut holder 620 is separated from the loosening prevention bolt 610. Includes a snap ring (640) to prevent,
The expansion flange 300 has a bolt coupling part 320 to which the loosening prevention bolt 610 is fitted and fastened to the periphery of the outer edge extension part is formed at regular intervals, and the expansion and contraction packing gland 400 is the bolt coupling part A bolt fastening hole 420 is formed through which the anti-loosening bolt 610 is fitted at a position corresponding to (320) to be through-fastened toward the bolt fastening part 320,
A lock-tight treatment is performed on the part inserted and fastened from the anti-loosening bolt 610 to the bolt fastening part 320,
A key groove 611 is processed on one side of the outer surface of the anti-loosening bolt 610, and a key protrusion 621 engaged with the key groove 611 is protruded from the inner diameter of the nut holder 620,
A first packing member 750 is installed in the valve disc 200 so that a first packing member 750 in the form of an O-ring is interposed between the valve disc 200 and the composite seat 700 . A seating groove is formed to be recessed, and a first packing material 750 is installed to be seated in the seating groove, and a first packing material 750 is provided between the valve disk 200 and the conical metal sheet 710 and ,
A second packing material 810 is installed on the conical body seat 800 so that a second packing material 810 in the form of an O-ring is interposed between the conical body seat 800 and the inner circumferential surface of the valve body 100 . The groove is recessed, and the second packing material 810 is seated and installed in the seating groove, and a second packing material 810 is provided between the conical body seat 800 and the valve body 100. A butterfly valve having a telescopic packing structure and a composite seat structure.

delete delete

Images