KR20190051524A - Multiple Disk for Gate Valve And Slide Gate Valve Having the Same - Google Patents

Abstract

The present invention relates to a multi-disk for a valve and a slide gate valve having the same, which can suppress the occurrence of cavitation following the rapid flow of a fluid when the disk opens a flow path, and improve durability and enhance watertightness by reducing the frictional force between the disk and seat. According to the present invention, the multi-disk for a valve may include: a disk-shaped front disk for closing an inlet while coming into close contact with a seat formed in the inlet of the flow path, and having a plurality of through holes penetrating therein; a disk-shaped rear disk disposed at the rear of the front disk to be spaced apart at a predetermined distance, closing an outlet while coming into close contact with a seat formed in the outlet of the flow path, and having a plurality of through holes therein; an operation disk installed between the front disk and the rear disk to be vertically slidable at a predetermined distance with respect to the front disk and the rear disk, and vertically moving the front disk and the rear disk while vertically moving by being connected to a valve stem; and, a connection means for connecting the operation disk to be able to vertically move relative to the front disk and the rear disk.

Description

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

The present invention relates to a valve, and more particularly, to a multiple disk for a valve and a slide gate valve having the same, which are constructed of a plurality of portions that interlock with each other to open and close a passage while sliding in a vertical direction with respect to the passage.

A valve is a device that controls the flow rate, flow rate, and pressure of a fluid flowing through a pipe, and has been developed and used in various types. Among these valves, there are a gate valve used mainly for interrupting the fluid and a globe valve used mainly for regulating the flow rate of the fluid. Here, the gate valve is constituted such that the disk blocks the flow path vertically and opens and closes, and the flow of the fluid is in a straight line.

However, such a gate valve causes the fluid to rapidly flow through the narrow flow path at the initial opening time when the disk opens the flow path, so that the flow rate is increased and a pressure drop occurs, thereby causing the air in the fluid to vibrate There is a problem that cavitation occurs.

Further, when the disc opens and closes the passage, there is a problem that frictional force is generated between the contact portion with the valve seat and the wear of the disc and the seat due to the vertical movement of the disc, and the sealing performance is deteriorated.

Published Japanese Patent Application No. 2002-0016237 (Apr. 4, 2002) Registration No. 1287910 (registered on July 15, 2013) Registered utility model 0405508 (Registered on January 2, 2006)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to reduce the friction between the disk and the seat by suppressing the occurrence of cavitation due to the rapid flow of the fluid when the disk is opened, The present invention provides a multiple disk for a valve and a slide gate valve having the same, which can improve durability and water tightness.

In order to accomplish the above object, the present invention provides a multiple disk for a valve, comprising: a disk-shaped front disk having a plurality of through holes formed therein so as to be in close contact with a sheet formed at an inlet of a flow path, A disk-shaped rear disk which is spaced apart from the rear surface of the front disk by a predetermined distance and closes the discharge port in close contact with the sheet formed at the discharge port of the flow path, An operation disk installed between the front disk and the rear disk so as to be slidable up and down a predetermined distance from the front disk and the rear disk and connected to the stem of the valve to vertically move the front disk and the rear disk while moving up and down; And connecting means for connecting the operating disk with the front disk and the rear disk so that they can move up and down relative to each other.

A slide gate valve of the present invention includes: a valve body having a flow path through which fluid flows; A gate housing communicating with an upper end of the valve body; A stem disposed within the gate housing; And a plurality of discs installed on the inside of the valve body communicating with the lower portion of the gate housing and connected to a lower end of the stem to open and close the flow path of the valve body while moving up and down into the valve body and the gate housing by the stem .

According to the present invention, in the opening operation of the oil passage, the central operating disk rises to a predetermined height first, and the tension spring pulls the front disk and the rear disk in the mutual directions. Therefore, when the front disk and the rear disk are lifted, The front disk and the rear disk are lowered in the state that they are not in contact with the seat and the operation disk is lowered against the front disk and the rear disk in the lowermost position, The rear discs are pushed forward and backward, respectively, so that they are brought into close contact with the sheet, so that wear of the sheet can be minimized and durability can be improved.

Further, when the operation disc rises from the bottom dead center to a predetermined height, the lower through holes of the front disc and the rear disc are opened, and the upper through hole communicates with the operating hole, so that the through hole of the front disc can flow from the front to the rear. Accordingly, since a part of the fluid can flow out through the through hole at the opening of the flow path, cavitation due to the rapid flow of a large amount of fluid can be prevented.

FIG. 1 is a cross-sectional view of a gate valve to which a multi-disc is applied according to an embodiment of the present invention, in which a channel is closed.
Fig. 2 is a cross-sectional view showing an initial opening state of the flow path of the gate valve shown in Fig. 1. Fig.
Fig. 3 is a cross-sectional view showing the flow path of the gate valve shown in Fig. 1 in a fully opened state.
FIG. 4 is a perspective view showing a multiple disk of the gate valve shown in FIG. 1 projected. FIG.
5 and 6 are sectional views of multiple discs shown in FIG. 4, FIG. 5 shows a state of multiple discs in a closed-channel state, and FIG. 6 shows states of multiple discs in a closed-channel state.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, as claimed, and it is to be understood that the invention is not limited to the disclosed embodiments.

Hereinafter, with reference to the accompanying drawings, a multiple disk for a valve and a slide gate valve having the same will be described in detail with reference to the embodiments described below. Like numbers refer to like elements throughout the drawings.

1 to 6, a gate valve to which a multi-disc according to the present invention is applied includes a valve body 10 having a passage 11 through which a fluid flows, a gate housing 10 communicating with an upper end of the valve body 10 And a stem 30 connected to the lower end of the stem 30 in the valve body 10 to move the stem 30 upward and downward, And a multiple disk 100 which opens and closes the flow path 11 of the valve body 10 while moving up and down into the main body 10 and the gate housing 20.

The multiple disc 100 includes an operating disc 130 connected to the lower end of the stem 30 and a plurality of discs 100 installed on the front and rear surfaces of the operating disc 130, The front disk 110 and the rear disk 120 and the operation disk 130 are divided into a front disk 110 and a rear disk 120 for opening and closing the front side inlet 12 and the rear side outlet 13, So that relative movement is possible.

The valve body 10 is in the form of a circular tube and is connected to a pipe through which the fluid flows. An inlet port 12 through which the fluid flows is opened at the front side of the valve body 10 and an outlet port 13 through which fluid is discharged is formed at the rear side of the valve body 10. Circular ring-shaped sheets 14 and 15 are provided at the periphery of the inlet port 12 and the periphery of the discharge port 13 to contact the front disk 110 and the rear disk 120 of the multiple disk 100, respectively.

The upper end of the stem 30 is provided so as to protrude outward through the upper end of the gate housing 20 and the upper end of the stem 30 protruding outside the upper end of the gate housing 20 is provided with a handle The handle 32 is engaged. A male thread 31 is formed on the outer surface of the stem 30 and a female thread 21 is formed on the upper end of the gate housing 20 so as to be screwed with the male thread 31. When the handle 32 is rotated, the stem 30 rotates and moves up and down with respect to the gate housing 20 by the action of the male thread 31 of the stem 30 and the female thread 21 of the gate housing 20 .

The lower end of the stem 30 is fixed to the upper end of the operation disc 130 of the multiple disc 100 so that the stem 30 and the operation disc 130 move up and down together.

The multiple disc 100 includes a disc-shaped front disc 110 which closes an inlet port while closely adhering to a sheet 14 formed at an inlet port 12 of the passage, a sheet 15 formed at a discharge port 13 of the flow path, A disk-shaped rear disk 120 that closes the discharge opening 13 while being in close contact with the front disk 110 and the rear disk 120, And a connecting means for connecting the operating disk 130 to the front disk 110 and the rear disk 120 so as to be movable up and down relative to each other.

A plurality of through holes 111 and 121 are formed in the upper and lower portions of the front disk 110 and the rear disk 120 so as to allow the fluid to temporarily flow during opening and closing operations of the oil passage.

The rear surface of the front disc 110 is provided with a first tapered portion 112 inclined downwardly from front to back and a second tapered portion 122 inclined downward from the rear to the front surface of the rear disc 120, . Both sides of the grinding operation disk 130 have a shape in which the front and rear widths become smaller toward the lower side so as to have inclined surfaces corresponding to the first tapered portion 112 and the second tapered portion 122. When the operation disc 130 moves upwards, the operation disc 130 smoothly moves. When the operation disc 130 moves downward, both side surfaces (the front surface and the rear surface) of the operation disc 130 are in contact with the first taper The front disk 110 and the rear disk 120 are pressed forward and backward when the operating disk 130 moves to the bottom dead point because the first and second tapered portions 112 and 122 descend while pushing forward and backward, The watertightness can be improved because the sheet 14 on the side of the inlet 12 and the sheet 15 on the side of the discharge port 13 are strongly adhered.

The connection means includes an operation hole 131 passing through both sides of the operation disc 130 and having a long and long shape in the up and down direction and an operation hole 131 passing through the operation hole 131 and having both ends connected to the front and rear discs 110, 120, respectively.

The length of the operation hole 131 is larger than the diameter of the connection member, so that the connection member can be moved up and down by a certain distance from the inside of the operation hole 131. The operation hole 131 is communicated with the through holes 111 and 121 disposed above the front disc 110 and the rear disc 120 when the operating disc 130 of the connecting member moves upward.

The connecting member includes a central connecting rod 141 having a hollow tube shape, which is installed inside the operating hole 131 so as to be movable only in the vertical direction, and has one end fixed to the rear surface of the front disk 110 A front connecting rod 142 having one end slidably inserted through one end of the central connecting rod 141 and one end fixed to the front surface of the rear disk 120 and the other end connected to the center connecting rod 141. [ A rear connecting rod 143 slidably inserted through the other end of the front connecting rod 142 and the rear connecting rod 143 in the central connecting rod 141, And a tension spring 144 for applying an elastic force to the front connecting rod 142 and the rear connecting rod 143 forward and backward, respectively.

The vertical height of the central portion of the operating hole 131 in which the central connecting rod 141 is received is formed to be larger than the vertical height of the opposite side portions of the operating hole 131, A step 132 is formed to limit the forward and backward movement of the central connecting rod 141.

Operation of the gate valve thus constructed will be described as follows.

1, if the user wishes to open the flow path in the closed state of the flow path, if the user rotates the handle 32 in one direction, the male thread 31 of the stem 30 and the female thread 31 of the gate housing 20 21), the stem (30) rotates and moves upward.

The operating disc 130 connected to the stem 30 is raised together. At this time, only the actuating disc 130 rises and the front disc 110 and the rear disc 120 do not rise until the lower end of the actuating hole 131 of the actuating disc 130 is caught by the central connecting rod 141 The first tapered portion 112 is formed on the rear surface of the front disk 110 and the second tapered portion 122 is formed on the front surface of the rear disk 120. As a result, So that it easily ascends to the upper side. The front disc 110 and the rear disc 120 are pulled toward each other by the tension spring 144 so that the front disc 110 and the rear disc 120 are separated from the sheets 14 and 15 The frictional force between the front disc 110 and the back disc 120 and the sheets 14 and 15 is minimized when the front disc 110 and the rear disc 120 are lifted up after they are loosely contacted with the sheets 14 and 15 (See Figs. 2 and 6).

When the operation disk 130 is lifted up to a predetermined height, the central connection rod 141 is pulled upward by the central connection rod 141 at the lower end of the operation hole 131 of the operation disk 130 as shown in FIG. do. The front connecting rod 142 and the rear connecting rod 143 are connected to both sides of the central connecting rod 141 so that the front connecting rod 142 and the rear connecting rod 143 are raised together, And the rear disk 120 are lifted to open the flow path.

The upper through holes 111 and 121 of the front disk 110 and the rear disk 120 are opened while the upper through holes 111 and 121 are opened by the operating balls 130. [ The through hole 131 of the front disc 110 and the upper through hole 121 of the rear disc 120 in order to flow from the front to the rear. Therefore, since a part of the fluid can flow out through the through holes 111 and 121 at the opening of the flow path, cavitation due to rapid flow of a large amount of fluid can be prevented.

As shown in FIG. 3, when the operation disk 130 pulls up the front disk 110 and the rear disk 120 and is completely drawn into the gate housing 20, the flow path 11 is completely opened.

The stem 30 and the operation disc 130, the front disc 110 and the rear disc 120 are lowered together when the stem 30 is rotated. When the front disk 110 and the rear disk 120 come to a stop and come into contact with the bottom surface of the flow path 11 while the disk 110 continues to descend, the operating disk 130 pivots the first taper portion 112 and the second taper portion 122 The tension spring 144 in the central connecting rod 141 is stretched so that the first tapered portion 112 and the second tapered portion 122 are forced in the outward direction, 110 and the rear disk 120 are brought into close contact with the sheets 14, 15, respectively, so that excellent watertightness can be obtained.

In this way, in the multi-disc 100 of the present invention, when the channel 11 is opened, the center operating disc 130 first rises to a certain height, and the tension spring 144 moves the front disc 110 and the rear disc 120 It is possible to minimize the friction with the sheets 14 and 15 when the front disk 110 and the rear disk 120 are lifted and to prevent the friction between the front disk 110 and the rear disk 120 The front disc 110 and the rear disc 120 are pushed forward and backward respectively as the operating disc 130 is lowered at the lowermost position and the sheets 14 and 15 The abrasion of the sheets 14 and 15 can be minimized and the durability can be improved.

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 spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

10: valve body 11:
12: inlet 13: outlet
14, 15: seat 20: gate housing
30: stem 32: handle
100: multiple disc 110: front disc
111: through hole 112: first tapered portion
120: Rear disc 121: Through hole
122: second tapered portion 130: operating disc
131: Operator ball 141: Central connection rod
142: front connecting rod 143: rear connecting rod
144: Tension spring

Claims (8)

A disk-shaped front disk 110 which is in close contact with the sheet 14 formed in the inlet 12 of the flow path and closes the inlet;
A disc-shaped rear disc 120 disposed at a predetermined distance behind the front disc 110 and closing the discharge port 13 in close contact with the sheet 15 formed at the discharge port 13 of the flow path;
The front disk 110 and the rear disk 120 are slidable up and down by a predetermined distance between the front disk 110 and the rear disk 120 and connected to the stem 30 of the valve to move up and down An operation disk 130 for moving the front disk 110 and the rear disk 120 up and down; And
Connecting means for connecting the operating disk 130 to the front disk 110 and the rear disk 120 so as to be movable up and down;
For each valve. The apparatus according to claim 1, wherein a plurality of through holes (111) are formed in the front disk (110) so as to pass through the front disk (110) 111) are formed so as to pass through in the front-rear direction. The rear disc according to claim 1, wherein a front side of the front disc (110) is provided with a first tapered portion (112) inclined downward from front to back, And a second tapered portion 122 is provided on the opposite side of the operation disk 130. Both side surfaces of the operation disk 130 have a front and rear width smaller toward the lower side so as to have inclined surfaces corresponding to the first tapered portion 112 and the second tapered portion 122 Multiple discs for losing valves. 2. The apparatus according to claim 1, wherein the connection means comprises: an operation hole (131) penetrating both sides of the operation disc (130) and having an elongated shape in the up and down direction; 110) and the rear disc (120), respectively. The apparatus according to claim 4, wherein a plurality of through holes (111) are formed in the front disk (110) so as to pass through the front disk (110) The operation hole 131 is formed in the front surface of the front disk 110 and the rear surface of the rear disk 120 when the operation disk 130 moves up a certain distance, Is communicated with the through holes (111, 121) of the valve. 5. The apparatus according to claim 4, wherein the connecting member comprises: a central connecting rod (141) in the form of a hollow tube, which is installed inside the operating hole (131) so as to be movable only in the vertical direction, A front connecting rod 142 fixed to the rear surface of the rear disk 120 and having one end slidably inserted through one end of the central connecting rod 141, A rear connecting rod 143 one end of which is slidably inserted through the other end of the central connecting rod 141 and a rear connecting rod 143 which is connected to the front connecting rod 142 and the rear connecting rod 143 inside the central connecting rod 141, And a tension spring (144) disposed between the front connecting rod (142) and the rear connecting rod (143) to apply an elastic force to pull the rear connecting rod (143) in the mutual direction. The apparatus according to claim 6, wherein a height of the central portion of the actuating hole (131) in which the central connecting rod (141) is received is set to be larger than a vertical height of both side portions of the actuating hole (131) And a step (132) for limiting the movement of the central connecting rod (141) in the forward and backward directions is formed between the central part and the both side parts. A valve body (10) having a flow path through which fluid flows;
A gate housing (20) communicating with an upper end of the valve body (10);
A stem 30 installed inside the gate housing 20;
The stem 30 is installed inside the valve body 10 communicating with the lower portion of the gate housing 20 and connected to the lower end of the stem 30, And a plurality of discs according to any one of claims 1 to 7 for opening / closing the flow path of the valve body (10) while lifting and lowering the valve body (10).

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