KR101884250B1 - Knife gate valve - Google Patents

Abstract

The present invention provides a ceramic plate having a high hardness on one side of a knife gate facing a moving direction of a fluid such as sludge so as to minimize scratches and abrasion on the kneading surface in direct contact with fluid such as sludge in the knife gate And a gate mounting groove having a semicircular groove formed in a lower portion thereof is formed vertically in the center of the inner portion. ≪ / RTI > A knife gate having a semicircular cross section formed in a lower portion thereof to be in close contact with an inner circumferential surface of the semicircular groove; A first ceramic tube which is detachably inserted and detachably mounted to one horizontal flow path formed on one side of the horizontal flow path; A second ceramic tube inserted and detachably inserted into or detached from the other side horizontal flow path formed on the other side of the horizontal flow path and having one side surface closely attached to the other side surface of the knife gate; And a circular ceramic plate bonded or bonded to one side of the knife gate or inserted into a recess formed in one side surface of the knife gate and having an outer surface in contact with the fluid.

Description

A knife gate valve

The present invention relates to a knife gate valve, and more particularly, to a knife gate valve having a ceramic plate having a high hardness on one side of a knife gate facing a moving direction of a fluid such as sludge and being in direct contact with a fluid such as sludge To a knife gate valve capable of minimizing scratches and abrasion of the concave surface.

In general, a knife gate valve is used to control or open or close the flow path of a pipeline to transfer or block fluid, sludge, or the like. That is, the knife gate valve is used to transfer or shut off a sludge-mixed transfer material such as a wire, a vinyl piece, or a coal combustible material, such as a paper mill or a thermal power plant, as well as fluids, pulp and cement.

Accordingly, the present invention is an improvement of a conventional knife gate valve. First, as an example of a conventional knife gate valve, Korean Patent Laid-Open Publication No. 2011-0086236 discloses a "knife gate valve" (hereinafter referred to as a "conventional knife gate valve" The following is a summary of the results.

6, a conventional knife gate valve includes a through-hole 2 formed in one side thereof in a horizontal direction, and a cylindrical member 21 made of ceramic is inserted into an inner circumferential surface of the through- And a knife gate 5 for opening and closing the through hole 2 while moving inside the main body 1. [

The cylindrical member 21 of the ceramic is closely inserted into the inner circumferential surface of the through hole 2 and the cylindrical member 21 is provided on the upstream side or the downstream side of the through hole 2 to directly make contact with the flow of the fluid .

A flange 22 is formed at the end of the cylindrical member 21 facing the outside of the knife gate valve. The flange 22 is provided with at least one bolt hole 23, The bolts 24 are inserted and fastened to the main body 1 so that the cylindrical member 21 is detachably assembled to the main body 1. [

The knife gate 5 is a substantially rectangular plate member which is formed in a lower portion of the knife gate 5 so as to hermetically seal the through hole 2 in a semicircular shape And at least a part of the semicircular end portion is provided with a reinforcing portion 25 plated with chromium.

Therefore, in the conventional knife gate valve, the cylindrical member 21 made of ceramic or elastic material is inserted into the inner circumferential surface of the through hole and the half end of the knife gate is plated with chromium to improve the wear resistance, And the time and cost of maintenance can be saved.

However, in the conventional knife gate valve constructed as described above, the fluid such as sludge flowing from the upstream side directly comes into contact with the surface of the knife gate (hereinafter referred to as "contact surface") so that the surface of the knife gate contacts the sludge And is seriously damaged through foreign substances such as metal included.

Therefore, in the conventional knife gate valve, the fluid contact surface of the knife gate is severely scratched and abraded due to the contact of the sludge, so that the corrosion of the knife gate rapidly occurs from the damaged portion, thereby shortening the life of the knife gate there was.

Also, when the knife gate is corroded quickly as described above, the knife gate needs to be replaced entirely, which causes a problem of excessive replacement cost.

Further, in the conventional knife gate valve, the half-end portion of the knife gate is in close contact with only one end of the cylindrical member of the ceramic to block the fluid, so that when the fluid is shut off, It also had a problem of poor performance.

In addition, in the conventional knife gate valve, one end of the cylindrical member of chrome and ceramics plated on the semicircular end of the knife gate is directly adhered to block the fluid.

However, when one end of the cylindrical member of chrome and ceramics plated on the semicircular end portion is in direct contact, the hardness of chrome and the hardness of the ceramic member of the cylindrical member are different from each other, and the plated chrome or the ceramic constituting the cylindrical member Materials with low hardness are quickly destroyed first.

Therefore, the conventional knife gate valve has a problem that the maintenance cost is excessively increased due to frequent replacement of the knife gate or the cylindrical member due to the short life of one of the knife gate or the cylindrical member of different kind.

Korean Patent Publication No. 2011-0086236 entitled "Knife Gate Valve" (published on July 28, 2011)

Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

It is an object of the present invention to provide a ceramic plate having a high hardness on one side of a knife gate facing a moving direction of a fluid such as sludge so as to minimize scratches and abrasion of the coalescing surface in direct contact with sludge at the knife gate And a knife gate valve.

Another object of the present invention is to provide a knife gate valve capable of double-blocking a fluid by closely contacting one side surface of a ceramic plate provided on one side of a knife gate and the other side surface of a first ceramic plate.

It is another object of the present invention to provide a knife gate valve that covers one side edge of a semicircular cross section of a knife gate with a ceramic plate to prevent one side edge of a semicircular cross section of the knife gate from being contacted with the sludge to be worn .

It is a further object of the present invention to provide a ceramic cylindrical circular ring which is in close contact with the other end face of the second ceramic tube on the other side of the knife gate, thereby not only delaying the wear of the sealing portion of the knife gate, The knife gate valve and the second ceramic tube are provided with a knife gate valve for maximizing the contact damage between the ceramic circular ring and the second ceramic tube by making the ceramic circular ring having the same hardness and the second ceramic tube come into close contact with each other .

It is a further object of the present invention to provide a knife structure which can further improve the barrier performance of the fluid by enlarging the close sealing area of the knife gate by further forming a circumferential expansion seal on the outer periphery of one end of the second ceramic tube, Valve.

It is a further object of the present invention to provide a knife structure in which when the knife gate and the second ceramic tube are worn to cause leakage due to wear of the sealing surface of the knife gate during the use of the valve, And the second ceramic tube is brought into close contact again so that the leaked state can be quickly repaired.

In order to achieve the above object, a "knife gate valve" according to the present invention is formed with a circular horizontal flow passage for moving a fluid therein, a central opening communicating with the horizontal flow passage, A body having a vertically formed gate mounting groove formed therein; A knife gate having a semicircular cross section formed in a lower portion thereof to be in close contact with an inner circumferential surface of the semicircular groove; A first ceramic tube which is detachably inserted and detachably mounted to one horizontal flow path formed on one side of the horizontal flow path; A second ceramic tube inserted and detachably inserted into or detached from the other side horizontal flow path formed on the other side of the horizontal flow path and having one side surface closely attached to the other side surface of the knife gate; And a circular ceramic plate bonded or bonded to one side of the knife gate or inserted into a recess formed in one side surface of the knife gate and having an outer surface in contact with the fluid.

Further, the one side of the ceramic plate of the "knife gate valve" according to the present invention and the other side surface of the first ceramic tube are closely contacted with each other.

The ceramic plate of the "knife gate valve" according to the present invention is adhered or bonded to one side of the knife gate, and a semicircular cross section of the lower periphery of the ceramic plate is worn at one side corner of the semi- And is formed with a flat surface having an outer diameter equal to the semicircular cross section of the lower portion of the knife gate.

In addition, a plate-shaped ceramic circular ring closely adhered to the other end surface of the second ceramic tube is further adhered or bonded to the other side surface of the knife gate of the "knife gate valve"

Further, an expansion groove communicating with the semicircular groove is further formed on one side of the inner circumferential surface of the other side horizontal flow passage of the "knife gate valve" according to the present invention, And a circumferential expansion seal part extending outwardly so as to be able to expand into a tightly sealed area and having one side thereof being in close contact with the knife gate and being inserted into the expansion groove is further formed integrally.

The inner diameter of the one-side horizontal flow passage of the "knife gate valve" according to the present invention is formed to be equal to or larger than the outer diameter of the circumferential expanding sealing member so that the second ceramic tube can be inserted from one side to the other side .

Further, the second ceramic tube of the "knife gate valve" according to the present invention is inserted into the other side horizontal flow path so as to be detachably moveable in the left and right direction, and the other side surface of the circumferential- And a rubber elastic material ring of a plate-like shape for always pressing the peripheral expansion seal part in one direction is further formed between the inner peripheral surface of the outer peripheral surface of the outer peripheral surface of the outer peripheral surface of the rubber-

Further, a plurality of horizontal tap holes communicating with the outside are formed around the other side surface formed on the other side of the expansion groove of the "knife gate valve" according to the present invention, and a plate- Wherein a plurality of set screws for pressing one of the tightening pushing rings is fastened and inserted into the horizontal tap holes from one side to the other side of the horizontal tap holes, And a release preventing spring for pressing the side surface is further mounted.

According to the present invention configured as described above, since a ceramic plate having a high hardness is provided on one surface of a knife gate facing a fluid movement direction of a sludge or the like, scratches and abrasion of the coagulation surface in direct contact with the sludge at the knife gate The life of the knife gate can be maximized by reducing the size of the knife gate to a minimum, and when the ceramic plate is worn, the knife gate can be reused by replacing only the ceramic plate.

According to the present invention, since one side of the ceramic plate provided on one side of the knife gate and the other side surface of the first ceramic plate are in close contact with each other, .

Further, according to the present invention, one side edge of a semicircular cross section of a knife gate is covered with a ceramic plate, so that one side edge of a semicircular cross section of the knife gate is prevented from being abraded by contact with sludge, There is also an effect.

Further, the present invention further has a plate-shaped ceramic circular ring adhered to the other end surface of the second ceramic tube at the other side surface of the knife gate, thereby having an effect of delaying the wear of the sealing portion of the knife gate. And the ceramic cylindrical ring having the same hardness are brought into close contact with the second ceramic tube at the sealing portion of the second ceramic tube, thereby maximizing the contact damage between the ceramic circular ring and the second ceramic tube.

Further, according to the present invention, a circumferential enlarged sealing portion is further formed on the outer circumference of one end of the second ceramic tube to enlarge the tight sealing area of the knife gate to thereby further improve the shielding performance of the fluid. There is also an effect of providing a knife gate valve.

According to another aspect of the present invention, there is provided a method of manufacturing a knife joint, comprising the steps of: moving a knife gate to a knife gate and a second ceramic tube, There is an advantageous effect of providing a knife gate valve which can be easily repaired by allowing the spaces between the ceramic tubes to be brought into contact again so that the leakage state can be quickly repaired.

FIG. 1 shows a knife gate valve according to a first embodiment of the present invention,
1A is a front view,
FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A,
1C is an enlarged view of the main part,
1D is an enlarged schematic perspective view of the knife gate;
FIG. 2 shows another embodiment of the knife gate constituting the knife gate valve according to the first embodiment of the present invention,
2A is a sectional view showing a mounting state,
2B is an enlarged schematic perspective view.
3 is a sectional view showing another embodiment of the knife gate valve of the first embodiment according to the present invention.
4 is a cross-sectional view of a knife gate valve according to a second embodiment of the present invention.
5 is a sectional view of a knife gate valve according to a third embodiment of the present invention.
Figure 6 shows a conventional knife gate valve,
6A is a cross-sectional view,
6B is an enlarged view of a portion B in Fig. 6A.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1B is a cross-sectional view taken along the line AA in Fig. 1A, Fig. 1C is an enlarged view of the main part, Fig. 1D is a view showing a knife gate valve according to a first embodiment of the present invention, FIG. Fig. 2 shows another embodiment of the knife gate constituting the knife gate valve of the first embodiment according to the present invention. Fig. 2 (a) is a cross-sectional view showing a mounting state, and Fig. 2 (b) is an enlarged schematic perspective view.

As shown in the drawing, the knife gate valve according to the first embodiment of the present invention includes a body 100 having a horizontal flow path 110 formed therein and a gate mounting groove 120 vertically formed at the center thereof, A knife gate 200 vertically inserted into the gide mounting groove 120 and a knife gate 200 formed on one side of the horizontal channel 110 (hereinafter referred to as " one side " A second ceramic tube 400 inserted and mounted on the other side of the horizontal passage 110 and a second ceramic tube 400 which is attached to one side of the knife gate 200, (Not shown).

The gate mounting groove 120 formed in the body 100 is formed to communicate with the horizontal channel 110 and is opened at an upper portion to vertically insert the knife gate 200. A semicircular groove 212 is formed in the lower portion of the gate mounting groove 120 so that the lower portion of the knife gate 200 can be closely contacted. The upper part of the body 100 is provided with an opening and closing part 700 which is connected to the knife gate 200 to move the knife gate 200. The opening and closing part 700 is already known in various forms The detailed description thereof will be omitted.

The knife gate 200 has a vertical plate shape and is inserted into the gate mounting groove 120 so as to be able to move up and down. A semicircular section 210 is formed in the lower portion of the knife gate 200 so as to be in close contact with the inner circumferential surface of the semicircular groove 121.

The first ceramic tube 300 is inserted into one horizontal flow path 111 formed at one side of the horizontal flow path 110. The first ceramic tube 300 may be adhesively attached to the one horizontal channel 111 by an adhesive, or may be detachably inserted and detached.

The second ceramic tube 400 is inserted into the other horizontal flow path 112 formed on the other side of the horizontal flow path 110. The first ceramic tube 300 may be adhesively attached to the other side horizontal flow path 112 by adhesive bonding or may be detachably inserted and detached.

The ceramic plate 500 is bonded or bonded to a lower portion of one side of the knife gate 200 so that the outer surface of the ceramic plate 500 is in contact with the fluid. When the ceramics board 500 is bonded to one side of the knife gate 200 made of metal, it is bonded using an adhesive. The method of joining the ceramic plate 500 to one side of the knife gate 200, which is a metallic material, is known in various forms, so a detailed description of joining will be omitted.

It is most preferable that one side surface of the ceramic plate 500 and the other end surface of the first ceramic tube 300 are closely attached to each other so as to block the fluid together with the ceramic circular ring 600. Therefore, according to the present invention, the outer surface of the ceramic plate 500 bonded to one side of the knife gate 200 and the other end surface of the first ceramic plate 500 are brought into close contact with each other, It can improve performance even more.

A semicircular section 210 of the lower circumference of the ceramic plate 500 is formed by a semicircular section 210 of the lower part of the knife gate 200 and a semicircular section 210 of the lower part of the knife gate 200 to cover one corner of the semicircular section 210 It is preferable that they are formed as flat surfaces having the same outer diameter. Accordingly, the present invention covers one side edge of the semicircular end face 210 of the knife gate 200 through the ceramic plate 500, so that one side edge of the semicircular end face 210 of the knife gate 200 directly contacts the sludge So that it can be prevented from being worn.

2, the circular ceramic plate 500 is formed in a recessed groove (not shown) formed on one side surface of the knife gate 200 220 to be adhered to each other.

That is, the knife gate plate 500 of another embodiment includes a circular recessed groove 220 into which the ceramic plate 500 is inserted at one side of the knife gate 200, and inserted into the recessed groove 220 And a circular ceramic plate 500 adhered with an adhesive.

On the other hand, the ceramic plate 500 and the first ceramic tube 300 preferably use Al2O3 ceramics or ZrO2 ceramics having excellent surface hardness. The hardness of the ceramics plate 500 and the first ceramic tube 300 is preferably HRa88 to HRa88 so that the ceramic plate 500 and the first ceramic tube 300 can have sufficient hardness.

Hereinafter, the operation of the knife gate valve according to the first embodiment of the present invention will be described.

1 and 2, the knife gate valve of the first embodiment according to the present invention is configured to lift the knife gate 200 by opening operation of the opening and closing part 700 provided on the upper part of the body 100, And the knife gate 200 is lowered by interrupting operation of the opening and closing part 700 to block the fluid.

The knife gate valve according to the first embodiment of the present invention includes a ceramic plate 500 having a high hardness on one surface of the knife gate 200 facing the fluid moving direction such as sludge, 200 can minimize the scratches and abrasion of the coalescing surface in direct contact with the sludge.

Accordingly, the present invention is a useful invention that can maximally extend the service life of the knife gate 200 as it minimizes scratches and abrasion of the ceramic plate 500 joined or bonded to one side of the knife gate 200 .

3 is a cross-sectional view showing another embodiment of the knife gate valve of the first embodiment according to the present invention.

3, a plate-shaped ceramic circular ring 600 adhered to the other end surface of the second ceramic tube 400 may be further adhered or bonded to the other side surface of the knife gate 200 . When the ceramic circular ring 600 is adhered to the other side of the knife gate 200 made of metal, it is bonded using an adhesive. The method of joining the ceramic circular ring 600 to the other side of the knife gate 200, which is a metallic material, is known in various forms, so that a detailed description thereof will be omitted.

On the other hand, it is preferable to use Al 2 O 3 ceramics or ZrO 2 ceramics having excellent surface hardness. The hardness of the ceramics circular ring 600 is preferably HRa88 to HRa88 so that the ceramic circular ring 600 can have sufficient hardness.

Therefore, the present invention further includes a plate-shaped ceramic circular ring 600 adhered to the other end face of the second ceramic tube 400 on the other side of the knife gate 200, so that the wear of the sealing portion of the knife gate 200 Can be delayed.

The ceramic circular ring 600 having the same hardness and the second ceramic tube 400 are brought into close contact with the sealing portions of the knife gate 200 and the second ceramic tube 400, 2 ceramic tube 400 to the maximum extent.

4 is a cross-sectional view of a knife gate valve according to a second embodiment of the present invention.

4, the knife gate valve according to the second embodiment of the present invention is the same as the knife gate valve according to the first embodiment except for the ceramic circular ring 600, It is assumed that all the configurations of the knife gate valve of the exemplary embodiment are included.

Therefore, in the knife gate valve of the second embodiment according to the present invention, an expansion groove 112a communicating with the semicircular groove 121 is formed at one side of the inner circumferential surface of the other side horizontal flow path 112.

The peripheral edge of the second ceramic tube 400 is integrally formed with an outer peripheral edge of the peripheral edge of the second ceramic tube 400. The peripheral edge of the peripheral edge of the second ceramic tube 400 will be. Therefore, the present invention is characterized in that a circumferential extension sealing portion 410 is further formed on the outer periphery of one end of the second ceramic tube 400 to seal the knife gate 200 and the second ceramic tube 400, By expanding the area, the blocking performance of the fluid can be further improved.

The inner diameter of the one side horizontal flow passage 111 is preferably equal to or larger than the outer diameter of the circumferential expansion sealing portion 410 so that the second ceramic tube 400 can be inserted from one side to the other side. The first ceramic tube 300 inserted into the one horizontal passage 111 is formed to be thicker than the second ceramic tube 400 and the first and second ceramic tubes 300 400 are preferably formed identically so as to reduce the resistance of the fluid being moved.

The knife gate valve of the second embodiment according to the present invention is such that the second ceramic tube 400 is inserted into the other side horizontal flow path 112 in a detachable manner so that it can flow laterally. A rubber elastic material ring (not shown) is disposed between the other side surface of the circumferential expansion seal part 410 and the other side surface of the expansion groove 112a to press the circumferential expansion seal part 410 in one direction. 420 are provided.

Accordingly, the second ceramic tube 400 including the peripheral expansion seal part 410 is constantly pressed through the rubber elastic ring 420 to one side, so that the other side of the knife gate 200 and the second ceramic It is a useful invention to provide a knife gate valve having excellent sealing performance at one side of the tube (400) and excellent sealing sealing performance.

5 is a cross-sectional view showing a knife gate valve according to a third embodiment of the present invention.

As shown in FIG. 5, it is assumed that the knife gate valve of the third embodiment according to the present invention includes all the configurations of the knife gate valve of the second embodiment described above.

Therefore, in the knife gate valve of the third embodiment according to the present invention, a plurality of horizontal tap holes 112b communicating with the outside are further formed around the other side surface formed on the other side of the extended groove 112a. In addition, a plate-like urging ring 430 made of a metal material is further formed on the other side of the rubber elastic ring 420.

In addition, a plurality of set screws 440, one end surface of which presses the tight contact holding ring 430, are fastened and inserted into one side of the horizontal tapped holes 112b, and the other side of the horizontal tapped holes 112b An anti-release spring 450 for pressing the other side of the set screw 440 is further mounted. The other side of the set screw 440 is positioned inside the horizontal tap hole 112b so that the release preventing spring 450 can be attached to the horizontal tap hole 112b. Further, the other side of the set screw 440 is formed with a slot, a cross groove or a hexagonal groove into which a tool is inserted.

4, when the connection pipe is connected to the other side of the knife gate valve, the one end of the connection pipe pushes the other end of the release prevention spring 450, Thereby preventing the set screw 440 from loosening.

Therefore, when leakage occurs between the knife gate 200 and the second ceramic tube 400 due to wear of the sealing surface of the knife gate 200 during the use of the valve, The knife gate 200 and the second ceramic tube 400 can be brought into close contact again by moving the second ceramic tube 400 to one side by tightening the set screws 440 after removing the tube, will be.

Therefore, the present invention is a useful invention for quickly repairing a leaked state when leakage occurs between the knife gate 200 and the second ceramic tube 400 due to wear of the sealing surface of the knife gate 200.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the invention defined by the limitations of the following claims.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

100: Body
110: horizontal channel
111: One side horizontal flow path
112: the other horizontal channel
112a: extension groove, 112b: horizontal tap hole
120: gate mounting groove
121: Semicircular groove
200: Knife Gate
210: Semicircular cross section
220: recessed groove
300: first ceramic tube
400: Second ceramic tube
410: Peripheral Expansion Seal
420: rubber elastic ring
430: close contact ring
440: Set screw
450: Release spring
500: Ceramic plate
600: Ceramic round ring
700: opening /

Claims (9)

And a gate mounting groove 120 having an upper portion opened and a semicircular groove 121 formed at a lower portion thereof is formed at the center of the inner portion of the horizontal flow path 110, A body 100 formed vertically;
A knife gate 200 having a semicircular cross section 210 formed in the gate mounting groove 120 so as to be able to be lifted and lowered and being in close contact with an inner circumferential surface of the semicircular groove 121;
A first ceramic tube 300 which is detachably inserted and detachably mounted to one horizontal flow path 111 formed on one side of the horizontal flow path 110;
A second ceramic tube (not shown) in which one side end face of the second ceramic tube is closely attached to the other side of the knife gate 200, (400);
A circular ceramic plate 500 bonded or bonded to one side of the knife gate 200 or inserted into the recess 220 formed in one side of the knife gate 200 and having an outer surface in contact with the fluid;
/ RTI >
An expansion groove 112a communicating with the semicircular groove 121 is further formed at one side of the inner circumferential surface of the other horizontal passage 112. Around the outer circumference of one end of the second ceramic tube 400, And a circumferential expansion seal part 410 which is extended outwardly so as to be able to expand to a close sealing area with the knife gate 200 and which is in contact with the knife gate 200 and inserted into the extension groove 112a, ,
The second ceramic tube 400 is inserted into the other side horizontal flow passage 112 in a detachable manner so as to flow in the left and right direction and is connected to the other side of the circumferential expansion sealing portion 410 and the other side of the expansion groove 112a A rubber elastic material elastic ring 420 in the form of a plate is provided to press the peripheral edge sealing portion 410 in one direction at all times,
A plurality of horizontal tapped holes 112b communicating with the outside are further formed around the other side surface formed on the other side of the extension groove 112a, and a plate-like tightly pressing on the other side surface of the rubber material elastic ring 420, And a plurality of set screws 440 for pressing one of the contact pushing rings 430 is inserted into one side of the horizontal tap holes 112b from one side to the other side, And a release preventing spring (450) for pressing the other side of the set screw (440) is further mounted on the other side of the tapped hole (112b).
The method according to claim 1,
Wherein one side of the ceramic plate (500) and the other side surface of the first ceramic tube (300) are in close contact with each other.
3. The method of claim 2,
The ceramic plate 500 is bonded or bonded to one side of the knife gate 200,
A semicircular section 210 around the bottom of the ceramic plate 500
And a flat surface having the same outer diameter as the semicircular section 210 below the knife gate 200 so as to prevent one side edge of the semicircular section 210 of the lower portion of the knife gate 200 from being worn. valve.
The method according to claim 1,
And a plate-shaped ceramic circular ring (600) adhered to the other end surface of the second ceramic tube (400) is further adhered or bonded to the other side surface of the knife gate (200).
delete The method according to claim 1,
The inner diameter of the one-side horizontal flow path 111 is
Is formed to be equal to or larger than an outer diameter of the material of the circumferential expansion seal part (410) so that the second ceramic tube (400) can be inserted and mounted from one side to the other side.
The method according to claim 6,
The first ceramic tube 300 inserted into the one horizontal passage 111 is formed to be thicker than the second ceramic tube 400,
The inner diameters of the first and second ceramic tubes (300, 400) are formed identically to reduce the resistance of the fluid being moved.
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