KR20180043651A - Metal Butterfly valve with corrosion resistance - Google Patents

Abstract

The present invention relates to a butterfly valve of corrosion-resistant metallic material, comprising: a valve main body dividedly formed of corrosion-resistant metal material and capable of being disassembled and assembled; a plastic lining fixed to the inner circumferential surface of the valve main body; a valve disc formed of stainless steel and rotationally provided on the inner circumferential surface of the lining to open and close a duct; a disc seat detachably attached to the valve disc and in contact with the inner circumferential surface of the lining; a front and rear valve stem rotationally inserted into a disc boss formed in the valve main body and fixedly coupled to the valve disc to rotate the valve disc.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a butterfly valve,

The present invention relates to a butterfly valve of a corrosion-resistant metallic material, and more particularly, to a butterfly valve of a corrosion-resistant metallic material which facilitates replacement and repair of a component constituting a butterfly valve.

Generally, a butterfly valve is a valve installed on a pipe for supplying various kinds of water such as drinking water, industrial water, agricultural water, etc., and by opening and closing the pipe by rotating the disk in a disk shape, .

Such butterfly valves are widely used in construction fields, buildings, apartments, industrial plants, factories, sewage and wastewater treatment plants, and water treatment plants.

For example, a butterfly valve is installed on a pipe for transferring fluids such as various kinds of industrial water, seawater, wastewater or chemical chemicals. The butterfly valve rotates the valve disk inside the valve body as the handle rotates, And is used to control the flow of the fluid.

That is, the butterfly valve is provided with a valve disc rotatably installed inside a valve body connected to a conduit by a valve stem, and the valve disc thus installed is rotated by driving a driving device or a handle connected to the valve stem, Thereby controlling the flow of the fluid.

At this time, a disk sheet for holding the fluid tightness is mounted between the inner circumferential surface of the valve body and the outer circumferential surface of the valve disk.

Such a conventional butterfly valve is disclosed in Korean Patent Laid-Open No. 10-2009-0036101 (hereinafter referred to as "prior art document").

The conventional butterfly valve will be described in more detail with reference to the prior art documents. The butterfly valve includes a valve body connected to a pipe by using flange portions on both sides, a valve stem rotatable by external operation, And a fastening means such as a bolt or a pin for coupling the valve stem to the valve disc, and the like, which are provided on the outer circumferential surface of the disc, and which hermetically and tightly seal the fluid flowing through the duct.

Here, the valve stem can be rotated through an automatic type of driving means such as a cylinder or a motor or a manual type of handle, and in the case of a disc seat, a rubber material having excellent durability and corrosion resistance against high temperature or high pressure fluids, , EPDM, FP and the like can be used.

Normally, machines and valves used in industrial flange sites, waterworks sludge treatment facilities, sewage treatment plants, wastewater treatment plants are always exposed to corrosive fluids and corrosive gases, so application of corrosive materials is essential.

However, the conventional butterfly valve formed of a cast iron product has a small countermeasure against it, so that the deterioration of the function due to corrosion and the shortening of the life span of the butterfly valve become major drawbacks.

That is, since the conventional butterfly valve is a cast product, it is necessary to apply a coating for rust prevention to a portion which is in direct contact with the corrosive fluid, so that the workability due to the troublesome operation is deteriorated and the coating layer is not peeled off for a long time, The fly valve is eventually corroded by the corrosive fluid.

In addition, the conventional butterfly valve is disadvantageous in that maintenance and repair are difficult because the valve body is a cast product and can not be disassembled and assembled.

The butterfly valve as described above and the detailed description thereof are described in detail in the following prior art documents, so that a detailed description thereof will be omitted.

Korean Patent Laid-Open No. 10-2009-0036101

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a butterfly valve which can be disassembled and assembled into a valve body, The purpose is to provide.

Another object of the present invention is to provide a butterfly valve of a corrosion-resistant metallic material in which a valve body is made of stainless steel so that painting work for rust prevention is not required.

According to an aspect of the present invention, there is provided a butterfly valve of a corrosion-resistant metallic material, including: a valve body divided and formed by a corrosion-resistant metallic material so as to be disassembled and assembled; a plastic lining fixedly secured to an inner circumferential surface of the valve body; A valve disc rotatably provided on an inner circumferential surface of the lining to open and close the channel, a disc seat detachably attached to the valve disc and in contact with the inner circumferential surface of the lining, and a disc boss rotatably inserted into the disc boss formed in the valve body, And a butterfly valve of corrosion-resistant metallic material including front and rear valve stems coupled to the disc to rotate the valve disc.

A first bushing made of a plastic material is inserted into each of the disk bosses into which the front and rear valve stems are inserted, a second bushing made of a non-metallic material is inserted into the first bushing, The first bushing may have an inner protrusion formed on its inner side to support the second bushing and an outer protrusion on the outer side thereof may be protruded from the outer boss.

In addition, the disk boss through which the front valve stem is coupled is provided with a packing member in contact with the first bushing, and at the end of the packing member is provided a compression bushing supported in contact with the packing member, And an adapter having an actuator installed on one side of the disk boss may be provided at an end of the disk boss.

The rear valve stem is provided with a snap ring for supporting the second bushing in contact with the second bushing. The rear valve stem is detachably attached to the outer end of the disc boss into which the rear valve stem is inserted, .

Meanwhile, the valve body and / or the valve disc may be formed of stainless steel.

According to the butterfly valve of the corrosion-resistant metallic material of the present invention, since the valve body is formed in a structure divisible into two halves so that the valve can be disassembled and assembled, maintenance of the butterfly valve is facilitated and the maintenance property is improved. There is an effect that can be used.

According to the present invention, since the valve body is formed of the corrosion-resistant metallic material and the plastic lining is provided on the inner circumferential surface in contact with the corrosive fluid, it is not necessary to perform a separate painting operation for rust prevention on the valve body, .

Therefore, according to the butterfly valve of the corrosion-resistant metallic material of the present invention, it is possible to prevent the function and the life of the valve from being shortened.

1 is a perspective view of a butterfly valve of a corrosion-resistant metallic material according to the present invention.
Fig. 2 is a front structural view of Fig. 1. Fig.
Fig. 3 is a rear view of the configuration of Fig. 1. Fig.
Fig. 4 is a plan view of Fig. 1. Fig.
5 is an exploded perspective view of a butterfly valve of a corrosion-resistant metallic material according to the present invention.
Fig. 6 is a view showing a separation between a valve body and a plastic lining according to the present invention.
7 is a cross-sectional view taken along the line AA of Fig.
8 is a cross-sectional view taken along line BB of Fig.
9 is a view showing the valve disk of the butterfly valve of the corrosion-resistant metallic material according to the present invention being opened.

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

The terms used in the present invention are defined in consideration of the functions of the present invention and may vary depending on the intention or custom of the user or the operator. Therefore, the definitions of these terms are meant to be in accordance with the technical aspects of the present invention As well as the other.

Therefore, the term "and / or" used in the present invention is used to mean at least one of the constituents listed before and after, and "one or more" means one or more than two.

In addition, optional terms such as "first" and "second" used in the present invention are used to distinguish one element from another element, and the element is not limited thereto .

1 to 9 are views showing a butterfly valve of a corrosion-resistant metallic material according to the present invention.

1 to 5, a butterfly valve 100 of a corrosion-resistant metallic material according to the present invention includes a valve body 110, which is disassembled and assembled in two halves, A valve disc 130 rotatably provided on an inner circumferential surface of the lining 120 to open and close a channel and a valve disc 130 detachably mounted on an outer circumferential surface of the valve disc 130, And a valve disc 130 rotatably inserted into the disc bosses 111 and 112 formed in the valve body 110 and coupled and fixed to the valve disc 130, And a front and rear valve stem 160 (161) that rotates.

As shown in FIGS. 5 and 6, the valve body 110 is bisected on both sides of the valve body 110. However, the valve body 110 may be disassembled and assembled into several pieces. The valve body 110 thus disassembled and assembled can be formed in the shape of the valve body 110 by being formed of a corrosion-resistant metal material and pressed.

The valve body 110 made of a corrosion-resistant metallic material is an alloy of nickel and chromium. The valve body 110 is superior in corrosion resistance and heat resistance to carbon steel and is formed of at least 27 types of stainless steel having a low content of iron. .

Particularly, the front and rear disc bosses 111 and 112, to which the front valve stem 160 and the rear valve stem 161 are respectively coupled, are protruded from the unit members of the valve body 110, And coupling flanges 113 and 114, which are fastened as bolts and nuts, protrude in the axial direction of the valve body 110 so as to face each other.

The valve body 110 is divided into a plurality of unit flanges 113 and 114 by the bolts and the nuts, And the valve body 110 can be disassembled by loosening the bolts and nuts from the coupling flanges 113 and 114. [

The lining 120 inserted in the inner circumferential surface of the valve body 110 is injection-molded into a cylindrical shape and then processed.

The lining 120 is connected to the front valve stem 160 and the rear valve stem 161 coupled to the respective disk bosses 111 and 112 of the valve body 110, So that the valve body 110 is reinforced.

Particularly, since the plastic lining 120 is provided on the inner circumferential surface of the valve body 110, it is possible to prevent the corrosive fluid flowing in the channel of the butterfly valve 100 from directly contacting the inner circumferential surface of the valve body 110 Corrosion of the valve body 110 can be prevented as much as possible.

9, the valve disc 130 is rotatably provided on the inner circumferential surface of the plastic lining 120 to control the flow of the fluid by opening and closing the channel of the lining 120.

The valve disc 130 is made of a corrosion resistant metallic material such as stainless steel and can be formed into various shapes. In this embodiment, the valve disc 130 is formed of a bowl member, (130) as an example.

Therefore, as shown in FIGS. 7 and 8, the valve disc 130 thus formed is formed in a double structure of a plurality of plates rather than a single plate, thereby improving the durability of the valve disc 130.

A fixed block 131 protrudes from one side of the valve disc 130 and a front valve stem 160 and a rear valve stem 161 are inserted into the two fixed blocks 131, The fixing pins 133 are coupled to the fixing block 131 in a direction perpendicular to the direction of the connection of the valve blocks 160 and 161 so that the valve stems 160 and 161 are respectively fixed to the fixed block 131 .

At this time, the fixing pin 133 coupled to the fixed block 131 may be fixed to the fixed block 131 by welding.

The valve disc 130 has an engaging portion 132 which is engaged with the engaging protrusion 141 of the disc seat 140 to be described later and is engaged with the engaging protrusion 141, (132) is formed with a concave-convex groove corresponding to the engagement protrusion (141).

The disc seat 140 provided on the coupling portion 132 of the valve disc 130 is formed in a ring shape of elastic rubber and is replaceable. A coupling protrusion 141 protruding in a circular shape is formed on the outer circumference of the disc seat 140 And a concave groove is formed between the coupling protrusion 141 and the disc seat 140.

The engaging portion 132 of the valve disc 130 coupled to the engaging protrusion 141 of the disc seat 140 and the engaging portion 151 of the seat holder 150 And the two engaging portions 132 and 151 are engaged and fixed in a state in which the engaging protrusion 141 is received therein.

The support shaft 142 supporting the elastic disc sheet 140 is provided on the inner side of the disc seat 140 so that the engagement protrusion 141 of the disc seat 140 is supported by the support ring 142 It can be fixed firmly so as not to move in the correct position.

Accordingly, the disc sheet 140 as described above is fixed to the outer peripheral surface of the valve disc 130, i.e., the circumferential surface thereof, so that the disc sheet 140 can closely contact the lining 120 of the valve body 110 to control the flow of the fluid.

In addition, a sheet holder 150 is coupled to one surface of the valve disc 130 with a disc seat 140 interposed therebetween.

The seat holder 150 includes a coupling portion 151 having a shape corresponding to the coupling portion 132 formed on one side of the valve disc 130 facing the coupling portion 132 of the valve disc 130, 151) of the valve disc (130) in a state in which the coupling protrusion (141) of the valve disc (130) is received.

Meanwhile, the seat holder 150, which is provided as described above, is provided in a state of being in contact with one surface of the valve disc 130 and fastened and fixed as a bolt.

Therefore, the disc seat 140 can be easily maintained and maintained by detachably mounting the seat holder 150 on the valve disc 130.

The front valve stem 160 and the rear valve stem 161 are inserted into both the disk bosses 111 and 112 of the valve body 110 as described above.

Each of the valve stems 160 and 161 includes a disk boss 111 and a valve boss 111. The valve boss 111 and the valve boss 111 penetrate through the plastic lining 120, (Not shown) connected to the front valve stem 160 rotates the front valve stem 160 so that the valve disc 130 is moved to the lining (not shown) 120 to open and close the pipeline.

The first bushing 170 and the second bushing 170 are inserted into the inner circumferential surface of the disc boss 111 of the valve body 110 in which the valve stem 160 is inserted, 170) 171 are respectively inserted into second bushings 180 and 181 of smaller diameter. Therefore, the valve stem 160 (161) is inserted through the second bushing 180 (181) when the valve stem 160 (161) is inserted into the disc boss 111 (112).

The first bushing 170 and the second bushing 170 are formed of a plastic material having outer diameters corresponding to the inner diameters of the disk bosses 111 and 112 and the second bushings 180 and 181 are made of a non- And the inner diameters of the second bushings 180 and 181 are formed to correspond to the outer diameters of the valve stems 160 and 161 .

The first bushing 170 and the second bushing 170 which are in contact with the inner circumferential surface of the disc boss 111 are made of a plastic material so that the disc boss 111 and the disc boss 111 112 can be protected from corrosive fluids to prolong the life of the valve body 110 and the second bushing 180 or 181 contacting the outer circumferential surface of the valve stem 160 can be connected to the valve stem 160 ) And the valve stem 160 (161) rotated by reducing the frictional resistance between the valve stem 160 (161) and the valve stem 160 (161).

The first bushing 170 and the second bushing 170 protrude to the inside of the first bushing 170 and the first bushing 170, An inner protrusion 170a and a protrusion 171a for supporting the second bushing 180 and 181 to be inserted into the bushing 170 and 171 are protruded and the outer ends of the disc bosses 111 and 112 are formed at the other end, An outer protrusion 170b and a protrusion 171b are provided.

The first bushing 170 and the first bushing 170 are inserted into the respective disk bosses 111 and 112 so that the outer protrusions 170b and 171b are stopped at the outer ends of the disk bosses 111 and 112, The first bushing 180 and the second bushing 180 are inserted into the first bushing 170 and the first bushing 180 and the one end of the second bushing 180 is inserted into the inner bushing 170a 171a, respectively.

An inner end surface of the first bushing 170 and the inner bushing 170 provided inside the disc bosses 111 and 112 is in contact with the outer surface of the plastic lining 120 to maintain airtightness and watertightness. (190) and (191) are interposed therebetween.

3 and 5, the front disc boss 111 having the front valve stem 160 inserted therethrough is provided with a packing member 200 in contact with the outer end of the first bushing 170, A compression bushing 210 is provided at an outer end of the packing member 200 in contact with the packing member 200. The compressing bushing 210 is pressurized and supported at an outer end of the compression bushing 210, And an adapter 220 to which an actuator is installed.

The packing member 200 is made of a rubber material and is replaceable and is inserted into the first bushing 170 and is in contact with the outer end of the second bushing 180 to thereby prevent the front valve stem 160 and the second bushing 180).

The compression bushing 210 pushes the packing member 200 in contact with the second bushing 180 in contact with the outer end of the packing member 200 so that the packing member 200 can maintain a strong sealing force.

In addition, at the outer end of the compression bushing 210, the compression ring 230 is coupled to press the compression bushing 210.

On the other hand, the adapter 220 is formed of a ring-shaped disk spaced apart at regular intervals, and one end (a small disk side) of the adapter 220 is detachably attached to the outer surface of the front disk boss 111 as a bolt, The adapter 220 is provided with an actuator (not shown). The actuator may be connected to the front valve stem 160 passing through the adapter 220 to rotate the front valve stem 160.

The rear valve stem 161 provided in the rear disc boss 112 is provided with a snap ring 260 for supporting the second bushing 181 in contact with the second bushing 181, The outer end of the inserted disk boss 112 is provided with a cap 240 detachably coupled to the disk boss 112 to press-support the first bushing 171.

3 and 5, the outer surface of the first bushing 171 provided on the rear disc boss 112 is provided with an O-ring 250 for sealing the disc boss 112 in contact with the cap 240 .

The retaining ring 260 is coupled to the outer surface of the rear valve stem 161 and contacts the outer end of the second bushing 181 inserted in the first bushing 171, .

The cap 240 is detachably mounted on the outer surface of the rear disc boss 112 as a bolt so as to press the O-ring 250 with the first bushing 171 so that the rear disc boss 112 It is sealed.

In the butterfly valve 100 according to the present invention, the valve body 110 is made of stainless steel, so that it is possible to prevent corrosion from the corrosive fluid without performing a separate painting operation for rusting as well as being lightweight.

In addition, by providing a lining 120 made of a plastic material on the inner surface of the valve body 110 through which the corrosive fluid flows, it is possible to prevent the corrosive fluid from directly contacting the valve body 110, The source can be blocked.

A valve disc 130 is rotatably disposed inside the lining 120 and a disc sheet 140 made of rubber is disposed on the outer circumferential surface of the valve disc 130 contacting the inner circumferential surface of the lining 120. [ It is possible to precisely control the fluid as well as to minimize wear between the plastic lining 120 and the disc sheet 140.

Since the valve body 110 can be divided into two halves when the bolts coupled to the coupling flanges 113 and 114 are loosened, the plastic lining 120, the disc seat 140, Various bushings provided in the front and rear valve stems 160 and 161 can be easily replaced.

Therefore, in the butterfly valve 100 of the corrosion-resistant metallic material of the present invention, since the valve body 110 can be disassembled and assembled, the replacement of consumables is easy and the maintenance property is good.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

100: butterfly valve 110: valve body
111, 112: Disk boss 113: Coupling flange
120: lining 130: valve disc
131: coupling portion 132: fixed block
133: fixing pin 140: disc seat
141: coupling protrusion 142: support ring body
150: seat holder 151:
160, 161: front / rear valve stem 170, 171: first bushing
170a, 171a: inner protrusion 170b, 171b:
180, 181: second bushing 190, 191: O-ring
200: packing member 210: compression bushing
220: Adapter 230: Compression ring
240: cap 250: O-ring
260: Snap ring

Claims (6)

A valve body dividedly formed of a corrosion-resistant metallic material so as to be disassembled and assembled;
A plastic lining fixedly mounted on an inner circumferential surface of the valve body;
A valve disc formed of a corrosion-resistant metallic material and rotatably provided on an inner circumferential surface of the lining to open and close the channel;
A disc seat detachably attached to the valve disc and in contact with the inner peripheral surface of the lining; And
And a front and rear valve stem rotatably inserted into the disc boss formed in the valve body and coupled to the valve disc to rotate the valve disc.
The method according to claim 1,
A first bushing made of plastic is inserted into each of the disk bosses into which the front and rear valve stems are inserted,
Wherein the first bushing has a second bushing of a non-metallic material inserted therein, and a valve stem is inserted into the second bushing.
The method of claim 2,
Wherein the first bushing has an inner protrusion formed on an inner side thereof to be supported by the second bushing, and an outer protrusion supported on the outer surface of the disc boss is protruded from the outer boss.
The method of claim 2,
The disk boss, through which the front valve stem is coupled, is provided with a packing member in contact with the first bushing,
The end of the packing member is provided with a compression bushing which is held in contact with the packing member,
At the end of the compression bushing, a compression ring for pressingly supporting the compression bushing is provided,
Wherein an adapter is provided at an end of the disk boss, the adapter being provided at one side thereof with an actuator.
The method of claim 2,
The rear valve stem is provided with a snap ring which abuts against the second bushing and supports the second bushing,
A butterfly valve of a corrosion resistant metallic material, wherein a cap is provided at an outer end of a disk boss into which a rear valve stem is inserted, the cap being detachably coupled to a disk boss for pressing and supporting the first bushing.
The method according to claim 1,
Plastic lining is a butterfly valve of corrosion-resistant metallic material machined after injection.

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