KR20090110079A - Bonneted type knife gate valve - Google Patents

Abstract

PURPOSE: A bonneted knife gate valve is provided to replace a grand v-packing for the maintenance of air-tightness mounted on a space of a yoke without the pause of a process line. CONSTITUTION: A bonneted knife gate valve(100) comprises the followings. A valve body with a flow channel room which fluid passes through is formed at the lower part of the bonneted knife gate valve in the horizontal direction. A knife gate(220) opening and closing the flow channel room is mounted in the vertical direction of a valve body. A bonnet(230) with a space for the operation in the ascent and the descent of the knife gate is fixed on the upper end of the valve body. A yoke with an air cylinder is installed at the upper end of the bonnet. A rod is coupled with the lower part of the piston connected to the air cylinder through a connection pin. The knife gate is fixed at the lower end of the rod and is elevated according to the operation of the air cylinder and opens and closes the flow of the fluid.

Description

BONNETED TYPE KNIFE GATE VALVE}

The present invention relates to a bonnet-type knife gate valve used in a piping system requiring flow control and opening and closing, and more particularly, a knife gate and rod coming up and down when a knife gate is turned up or down or the flow path is shut off. The present invention relates to a bonnet-type knife gate valve that makes it easy to replace an airtight gland packing that is mounted separately in the yoke space without interrupting the process line while preventing fluid leakage.

In general, the knife gate valve is used to control the flow rate of powder, paper, fine powder, sludge, etc. and to open and close these piping systems. According to the MSS-SP-81 standard, the leak rate of the knife gate valve is 40 cc / min · inch. It is prescribed.

The knife gate valve includes a one-way valve and a two-way valve, and in particular, the two-way valve is used to control the fluid flowing in the opposite direction in addition to the function of controlling the one-way flow as in the conventional one-way valve.

And while the function of the two-way valve is achieved by the rubber seat structure, the rubber seat currently used in the two-way valve is, as shown in Figure 1, the flow path chamber of the valve body (10) valve body (10) 13) The insertion groove 15 is formed inside the rubber seat 16 is inserted to control the flow of the fluid by the knife gate 11 is in close contact.

However, such a structure may cause damage to the rubber seat 16 as the high speed fluid passes through the narrow space at the last time when the knife gate 11 descends and closes, or the fluid may contain impurities or sludge. There is a problem that damage to (16) results in deterioration of the maintenance of life and function.

2 shows a bonnet-type knife gate valve which overcomes the above-mentioned problems, and the bonnet-type knife gate valve has a flow path chamber 13 through which fluid passes in a horizontal direction under the valve body 10. And a knife gate 11 for opening and closing the flow path chamber 13 through which the fluid passes vertically, and a bonnet 20 having a space 21 inside the upper end of the valve body 10 is bolted. It is fixed by (17), it is made by fixing the air cylinder 40 to the top by coupling the support 35 to the top of the bonnet 20.

The rod 25 is fixed to the lower end of the piston 41 coupled to the air cylinder 40 by the connecting pin 26, and the knife gate 11 is coupled to the lower end of the rod 25.

However, the conventional bonnet-type knife gate valve has a problem in that the fluid is leaked while the knife gate is blocking the flow path seal or the fluid moves along the knife gate and the rod when the knife gate is moved up and down.

Referring to FIG. 3 in detail, when the knife gate 11 performs the up / down operation or blocks the flow path chamber 13, the fluid is gradually subjected to a high pressure through the knife gate 11. The fluid moves along the knife gate 11 and the rod 25 and comes into contact with the v-packing 50 mounted on the top of the bonnet 20. At this time, when the pressure of the fluid increases, the V-packing 50 is damaged as time passes and there is a problem that the fluid leaks.

That is, when the pressure of the fluid increases, the V-packing 50 is pressed by the grand operation as time passes, and after the time, the V-packing 50 moves to a malignant fluid or a vertical gate (opening / closing) knife gate ( 11) There was a problem that the fluid leaks as a result of the friction caused by the operation.

In addition, the conventional bonnet-type knife gate valve has to stop the process line and lower the pressure when replacing the v-packing due to the leakage or wear of the fluid as described above, it takes a long time and the economic loss There was this following issue.

The present invention has been made to solve the above problems, by changing the coupling portion of the bonnet and yoke constituting the bonnet-type knife gate valve, knife gate and rod, etc. when the knife gate lifting / lowering operation or blocking the flow path seal It is an object of the present invention to provide a bonnet-type knife gate valve that can easily replace an airtight grand v-packing that is mounted separately in the yoke space without stopping the process line while preventing leakage of fluid from the air.

In order to achieve the above object, a valve body having a flow path chamber through which the fluid passes in a horizontal direction is formed at the bottom, and the knife gate for opening and closing the flow path chamber through which the fluid passes in the vertical direction of the valve body is mounted; The top of the valve body is fixed to the bonnet which is formed with a space for the operation of the knife gate when the lifting / lowering, the top of the bonnet is installed a yoke having an air cylinder, the piston of the piston connected to the air cylinder In the lower portion of the bonnet knife gate valve is fastened to the rod by a connecting pin and the knife gate is fixed to the lower end of the rod to open or close the flow of fluid by raising and lowering the knife gate in accordance with the operation of the air cylinder V-packing for airtightness is installed on the upper inner circumferential surface of the bonnet through which the rod penetrates. Underneath, the mounting groove is further formed with an upper / lower bushing for securing the space of the v-packing and preventing the change of shape, and is fixed to the space of the yoke through which the rod penetrates through the bonnet and bolts. The grand v-packing for maintenance is mounted on the lower part of the mounting groove, while the upper part of the grand v-packing is pressurized to tighten the bolts and nuts fastened to the bonnet to increase the adhesion of the grand v-packing. A gland is mounted, and an intermediate block having a predetermined height is mounted between the bonnet and the yoke to distinguish the v-packing and the grand-v packing, and to be formed on an upper surface of the gland when the bottom of the grand ring moves according to the tightening operation of the gland. The groove is accommodated in the fixing groove formed in the lower portion to secure the upper bushing When the knife gate and the rod are shut off, the fluid flowing through the knife gate and the rod is blocked by V-packing and grand-V packing during the operation of the knife gate. After removing the gland is coupled to the bonnet, it is characterized in that to simply replace the grand v-packing mounted on the grand ring.

According to the present invention, the v-packing and gland are used to change the coupling portion of the bonnet and the yoke constituting the bonnet-type knife gate valve to move up / down the operation of the knife gate or to lift up the knife gate and rod when the flow path is blocked. Not only can it be blocked by the V-packing, but it is also possible to easily replace the Grand V-packing which is mounted in the yoke space without stopping the process line, thereby increasing the work efficiency and reducing the maintenance cost.

Hereinafter, the configuration of the present invention with reference to the accompanying drawings, Figure 4 is a front sectional view showing a bonnet knife gate valve according to the present invention, Figure 5 is a side sectional view showing a bonnet knife gate valve according to the present invention. 6 is a view showing the configuration of the main portion according to the present invention, Figure 7 is a partially enlarged front sectional view showing the main portion according to the present invention, Figure 8 is a partially enlarged side cross-sectional view showing the main portion according to the present invention.

The bonnet knife gate valve 100 of the present invention has a valve body 210 having a flow path 212 through which fluid flows in a horizontal direction at a lower portion thereof, and is mounted in a vertical direction of the valve body 210 and has a fluid. The knife gate 220 for opening and closing the flow path chamber 212, and is fixed to the upper end of the valve body 210 and the space portion (S) for the operation during the lifting / lowering of the knife gate 220 is formed Bonnet 230, the yoke 240 is installed on the top of the bonnet 230, the air cylinder 250 is provided, and the connecting pin 260 in the lower portion of the piston 252 connected to the air cylinder 250 The knife gate 200 which is fixed through the bottom and fixedly coupled to the lower side is lifted and lowered according to the operation of the air cylinder 250 to open or flow the fluid.

Here, since the configuration except for the bonnet 230 and the yoke 240 and the coupling portion, which is a feature of the present invention, is similar to the existing, a separate description will be omitted.

And the bonnet knife gate valve 100 of the present invention by changing the coupling portion of the bonnet 230 and the yoke 240 constituting the bonnet knife gate valve as shown in Figures 3 to 7, the knife gate 220 The space 242 of the yoke 240 without stopping the process line while blocking the leakage of fluid coming up through the knife gate 220 and the rod 270 when the operation of the up / down operation or the flow passage 212 is blocked. It is designed to easily replace the airtight grand v-packing separately installed on the

To this end, the bonnet 230, which is fixedly coupled to the upper end of the valve body 210 and has a space S for operation when the knife gate 220 is moved up and down, is coupled to the yoke 240 and has a rod ( A firewood groove 234 is formed in the inner circumferential surface 232 through which the 270 penetrates the center thereof.

In addition, the mounting groove 234 is equipped with a v-packing 310 for airtightness and upper / lower bushings 322 and 324 for securing a space while supporting the v-packing 310.

That is, the V-packing 310 mounted on the mounting groove 234 has the upper and lower bushings 322 and lower bushings 324 to be used for a long time while minimizing wear and loss according to the change of the formation and the load. To be mounted.

At this time, the lower bushing 324 is further equipped with a seal 700 for the airtightness, which will be described in more detail, the inner surface in contact with the rod 270 and the bottom surface in contact with the bonnet 230 is the V-packing Apart from the 310, the seal 700 for confidentiality is further mounted.

The grand ring 510 and the gland 520 sequentially mounted in the space 242 of the yoke 240 coupled to the bonnet 230 are kept tight together with the v-packing 310 mounted to the bonnet 230. The grand ring 510 has a mounting groove 512 formed on a lower inner surface (a surface in contact with the rod), and the mounting groove 512 is equipped with a grand v packing 330 for airtightness. The gland 520 mounted on the top of the gland ring 510 is formed to have a predetermined thickness, and at least two or more coupling mounting holes 524 are formed at the outer circumference thereof, and the coupling mounting hole 524 has the bonnet. A bolt 532 fastened to the 230 is screwed and a nut 534 is coupled to the upper portion thereof.

That is, the gland 520 is to press the grand ring 510 with the grand v-packing 330 according to the tightening of the bolt 532 and the nut 534 coupled to the bonnet 230.

At this time, the upper surface 514 and the lower surface 522 in contact with the grand ring 510 and the gland 520 are formed to be inclined, which is the grand v-packing during operation of the gland 520 for pressing the grand ring 510. The load is not transmitted to the 330 and is inclined to distribute the force.

In addition, the inner circumferential surface of the gland 520 may be further equipped with a ring 526 made of copper for smooth operation with the rod 270 during up / down operation, as well as contacting with the rod 270. The seal 700 is further mounted on the inner surface of the grand ring 510 to maintain the airtightness separately from the grand v packing 330.

An intermediate block 600 is installed between the bonnet 230 and the yoke 240 to distinguish the V packing 310 and the grand V packing 330 with a predetermined height.

And the upper surface of the intermediate block 600 is formed with a receiving groove 610 for accommodating the lower movement of the grand ring 520 according to the tightening operation of the gland 510 and to fix the upper bushing 322 in the lower portion Fixing groove 620 is formed.

The intermediate block 600 will be described in more detail. The intermediate block 600 may distinguish between the V packing 310 and the Grand V packing 330 of the grand ring 520 according to the tightening operation of the gland 510. When moving, the receiving groove 610 serves as a passage to block the force transmitted to the v-packing 310 of the bonnet 230.

In this case, the intermediate block 600 may be formed to have a different height according to the intended use or location, and further, a seal 700 for airtightness is further mounted on the inner surface contacting the rod 270. .

Referring to the embodiment of the bonnet knife gate valve configured as described above,

After the valve body 210 having the flow passage chamber 212 through which the fluid passes in the horizontal direction is formed at the lower portion, the knife gate opening and closing the flow passage chamber 212 through which the fluid passes in the vertical direction of the valve body 210. 220 mounts.

And the upper end of the valve body 210 is formed with a space (S) for operation during the lifting / lowering of the knife gate 220, the inner circumferential surface 232 is coupled to the yoke 240 and the rod 270 through The mounting groove 234 is formed, and the mounting groove 234 has a V-packing 310 and the upper / lower bushings (322, 324) for supporting the V-packing 310 in the upper, lower portion Fix the bonnet 230 to be mounted.

In addition, an air cylinder 250 is provided at an upper end of the bonnet 230 and a grand v for airtightness with a mounting groove 512 formed at a lower inner surface in a space 242 fixedly coupled to the bonnet 230. Grand ring 510 to which the packing 330 is mounted, and the grand ring 510 mounted on an upper portion of the grand ring 510 and mounted on the lower portion of the gland ring 530 and the nut 534 fastened to the bonnet 230. The yoke 240 is mounted to sequentially mount the gland 520 that applies pressure to the ring 510 to increase the adhesion of the grand v-packing 330.

At this time, the upper surface 514 and the lower surface 522 that the grand ring 510 and the gland 520 contact are formed to be inclined and the lower surface of the lower bushing 324 and the grand ring 510 contacting the rod 270. It is equipped with a seal 700 for confidentiality.

Next, between the bonnet 230 and the yoke 240 is made of copper having a predetermined height and the receiving groove 610 for accommodating the lower portion of the grand ring 520 according to the tightening operation of the gland 510 is The intermediate block 600 is formed on the upper surface and has a fixing groove 620 for fixing the upper bushing 322 to the lower portion.

At this time, the seal 700 for maintaining the air tightness is mounted on the inner surface in contact with the rod 270.

And the knife gate 200 which is fixed to the lower portion of the piston 252 connected to the air cylinder 250 through the connecting pin 260 and fixed to the lower end according to the operation of the air cylinder 250 lifts / lowers By mounting the flow of fluid to the opening or rod 270, the assembly of the bonnet knife gate valve 100 is completed.

Next, the bonnet-type knife gate valve 100, which is assembled as described above, is mounted and used in a piping system requiring flow control and opening and closing.

And the bonnet-type knife gate valve 100 used in the piping system is the knife gate 220 when the knife gate 220 according to the operation of the air cylinder 250, the operation of raising and lowering or the flow path 212 is blocked. The fluid coming up with the rod 270 is blocked through the V packing 310, the Grand V packing 330, and the seal 700, and the replacement of the Grand V packing 330 due to wear or loss occurs. After removing the gland 520 coupled to the bonnet 230 without stopping the process line, the gland v packing 330 mounted on the gland ring 510 may be simply replaced.

1 is a partially enlarged cross-sectional view showing a conventional knife gate valve.

2 and 3 are a cross-sectional view and a partially enlarged cross-sectional view showing a conventional bonnet knife gate valve.

Figure 4 is a front sectional view showing a bonnet knife gate valve according to the present invention.

Figure 5 is a side cross-sectional view showing a bonnet knife gate valve according to the present invention.

6 is a view showing a configuration of main parts according to the present invention.

Figure 7 is a partially enlarged front cross-sectional view showing the main portion according to the present invention.

Figure 8 is a partially enlarged side cross-sectional view showing the main portion according to the present invention.

※ Explanation of code for main part of drawing

100: bonnet knife gate valve, 210: valve body,

220: knife gate, 230: bonnet,

240: yoke, 250: air cylinder,

260: connecting pin, 270: rod,

310: V packing, 322: upper bushing,

324: lower bushing, 330: grand v packing,

400: bolt, 510: grand ring,

520: grand, 600: middle block,

610: receiving groove, 620: fixing groove,

700: Seal.

Claims (3)

A valve body 210 having a flow path chamber 212 through which fluid passes in a horizontal direction is formed at a lower portion thereof, and a knife gate for opening and closing a flow path chamber 212 through which fluid passes in a vertical direction of the valve body 210. 220 is mounted, the bonnet 230 is fixed to the upper end of the valve body 210 is formed a space (S) for the operation of the knife gate 220 at the time of lifting / lowering, the bonnet 230 Yoke 240 having an air cylinder 250 is installed on the top of the), and the lower portion of the piston 252 connected to the air cylinder 250 is fastened to the rod 270 by a connecting pin 260 The knife gate 220 is fixed to the lower end of the rod 270, and the bonnet knife gate valve for opening or closing the flow of fluid by raising / lowering the knife gate 220 in accordance with the operation of the air cylinder 250 ( 100), The V packing 310 for airtightness is mounted to the upper inner circumferential surface 232 of the bonnet 230 through which the rod 270 penetrates, and thus, the space of the V packing 310 is secured and the shape of the V packing 310 is prevented from being changed. To further form a mounting groove 234 is mounted to the upper and lower bushings (232, 234), In the space 242 of the yoke 240 that is fixedly coupled through the bonnet 230 and the bolt 400 and the rod 270 penetrates, a grand v packing 330 for airtightness is installed in the mounting groove 512. While mounting the grand ring 510 to be mounted on the lower portion of the upper portion of the grand ring 510 is fastened by applying pressure to the grand ring 510 mounted on the lower portion of the grand v Equipped with a gland 520 to increase the adhesion of the packing 330, An intermediate block 600 having a predetermined height is mounted between the bonnet 230 and the yoke 240 to distinguish the V packing 310 and the grand V packing 330 and tighten the gland 510. When the lower movement of the grand ring 520 according to the receiving groove 610 formed on the upper surface while receiving the fixing groove 620 formed in the lower portion to configure the upper bushing 322, When the knife gate 220 is turned up or down or the flow path 212 is blocked, the fluid coming up through the knife gate 220 and the rod 270 is blocked by the V packing 310 and the grand V packing 330. While the grand V packing 330 is replaced, the grand V packing 330 mounted on the grand ring 510 is simply removed after removing the grand 520 coupled to the bonnet 230 without stopping the process line. Bonnet knife gate valve, characterized in that the replacement. The method of claim 1, Bonnet knife gate valve, characterized in that the upper surface (514) and the lower surface (522) in contact with the gland ring (510) and the gland (520) is inclined. The method of claim 1, Bonnet knife gate valve, characterized in that the seal (700) for the airtight seal is further mounted on the inner surface of the lower bushing (324), the intermediate block (600), the grand ring (510) in contact with the rod (270).

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