Non-gasket type bolted bonnet-valve

Abstract

An invention regarding a non-gasket type bolted bonnet valve is disclosed. The disclosed non-gasket type bolted bonnet valve is characterized by comprising: a body having an inlet and an outlet formed to communicate through an internal flow passage and an opening connected to the flow passage; a cage provided in the flow passage and formed to have a plurality of opening holes through its circumferential surface and open at least one side along the axial direction to guide fluid flowing in from the inlet into the interior and discharge it towards the outlet; a bonnet that presses and presses one side of the cage exposed through the opening; a cap detachably coupled to the body and presses the bonnet toward the cage side; and a leak-prevention seal mounted on the outer surface of the body, inserted into the opening, and presses the bonnet toward the cage side by the pressing force of the cap.

Description

Technology Field

[0001] The present invention relates to a non-gasket type bolted bonnet valve, and more specifically, to a non-gasket type bolted bonnet valve that improves maintainability by using a leak-prevention seal instead of a conventional gasket to seal the space between the body and the cap of the valve, thereby securing the sealing force between the body and the cap, and increasing the sealing force by pressing the bonnet, cage, and seat so that the seat can be installed so as to be separated from the body. Background Technology

[0002] Generally, a valve is a device that controls the flow rate, velocity, and pressure of a fluid flowing through a pipe. Valves can be classified into various types depending on their purpose; high-temperature and high-pressure valves are used in various industrial fields, and are particularly widely used in power plants, such as thermal power plants, that utilize high-temperature and high-pressure steam.

[0003] In particular, for large high-temperature and high-pressure valves, the valve body and seat are often integrated using methods such as welding to prevent leakage.

[0004] Related technology has been proposed in Korean Patent Publication No. 10-2009-0111150 (Title of Invention: High Temperature High Pressure Valve).

[0005] The technical configuration described above is provided as background technology to aid in understanding the present invention and does not constitute prior art widely known in the technical field to which the present invention belongs. The problem to be solved

[0006] Conventional high-temperature, high-pressure valves have the problem that if the seat is deformed or damaged under high temperature or high pressure conditions, it is impossible to replace the seat alone, requiring the entire valve to be replaced. This leads to increased maintenance costs and causes leakage due to a decrease in the sealing force of the plug that seals the communication hole formed in the seat.

[0007] Conventional high-temperature, high-pressure valves secure sealing power by using a ring-shaped pad-type seal, but due to the limited contact area, leakage occurs even when the seal is deformed, making it difficult to ensure leak reliability.

[0008] Therefore, there is a need to improve this.

[0009] The present invention was devised to improve the above-mentioned problems, and aims to provide a non-gasket type bolted bonnet valve that improves maintainability by using a leak-prevention seal instead of a conventional gasket to seal the space between the body and the cap, thereby securing the sealing force between the body and the cap, and increasing the sealing force by pressing the bonnet, cage, and seat so that the seat can be installed so as to be separated from the body. means of solving the problem

[0010] A non-gasket type bolted bonnet valve according to the present invention comprises: a body having an inlet and an outlet formed through an internal flow passage and an opening connected to the flow passage; a cage provided in the flow passage, having a plurality of opening holes through its circumferential surface and formed to be open to at least one side along the axial direction, thereby guiding fluid flowing in from the inlet into the interior and then guiding it to be discharged in the outlet direction; a bonnet pressing one side of the cage exposed through the opening; a cap detachably coupled to the body and pressing the bonnet toward the cage; and a leakage-inhibiting seal mounted on the outer surface of the body, inserted into the opening, and pressing the bonnet toward the cage by the pressing force of the cap.

[0011] A non-gasket type bolted bonnet valve according to the present invention comprises: a seat that is seated at a set position of the flow passage, supports the cage, and guides the flow of fluid in the flow passage; a plunger provided on the inner side of the cage, which has a cylindrical or polygonal tubular shape; and a shaft that is fixedly connected to the plunger, is exposed to the outside through the bonnet, and moves the plunger by an external force to control the opening amount of the opening hole.

[0012] The above-mentioned leak-prevention seal is characterized by being made of a metal material.

[0013] The pressure of the above-mentioned leak-prevention seal is characterized by being increased by the pressure of the internal fluid.

[0014] The above cage is characterized by being detachable and replaceable from the body together with the sheet as it is pressed downward by the above leakage suppression seal.

[0015] The above-mentioned leak-prevention seal comprises: a ring pad that is placed on the body along the edge of the opening and forms a communication hole portion corresponding to the opening so as to be open on both sides; and a flange that extends from the ring pad to the other side along the edge of the communication hole portion, is fitted into the opening, and presses the bonnet toward the cage side.

[0016] The above flange is characterized by forming a first inclined surface, and the above bonnet is characterized by forming a second inclined surface that contacts the first inclined surface. Effects of the invention

[0017] As explained above, unlike the prior art, the non-gasket type bolted bonnet valve according to the present invention uses a leak-prevention seal to seal the space between the body and the cap without using a conventional gasket, thereby securing the sealing force between the body and the cap, and by increasing the sealing force by pressing the bonnet, cage, and seat, the seat can be installed so that it can be separated from the body, thus improving maintainability. Brief explanation of the drawing

[0018] FIG. 1 is a perspective view of a non-gasket type bolted bonnet valve according to one embodiment of the present invention. FIG. 2 is an exploded perspective view of a non-gasket type bolted bonnet valve according to one embodiment of the present invention. FIG. 3 is an exploded bottom perspective view of a non-gasket type bolted bonnet valve according to one embodiment of the present invention. FIG. 4 is an enlarged exploded perspective view of a key part of a non-gasket type bolted bonnet valve according to one embodiment of the present invention. FIG. 5 is a cross-sectional view of a non-gasket type bolted bonnet valve according to one embodiment of the present invention. FIG. 6 is an enlarged longitudinal section view of a key part of a non-gasket type bolted bonnet valve according to one embodiment of the present invention. Specific details for implementing the invention

[0019] Hereinafter, an embodiment of a non-gasket type bolted bonnet valve according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intention or convention of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification.

[0020] FIG. 1 is a perspective view of a non-gasket type bolted bonnet valve according to one embodiment of the present invention, and FIG. 2 is an exploded perspective view of a non-gasket type bolted bonnet valve according to one embodiment of the present invention.

[0021] FIG. 3 is a bottom exploded perspective view of a non-gasket type bolted bonnet valve according to one embodiment of the present invention, and FIG. 4 is an enlarged exploded perspective view of a key part of a non-gasket type bolted bonnet valve according to one embodiment of the present invention.

[0022] FIG. 5 is a longitudinal cross-sectional view of a non-gasket type bolted bonnet valve according to one embodiment of the present invention, and FIG. 6 is an enlarged longitudinal cross-sectional view of a key part of a non-gasket type bolted bonnet valve according to one embodiment of the present invention.

[0023] Referring to FIGS. 1 to 6, a non-gasket type bolted bonnet valve (100) according to one embodiment of the present invention includes a body (110), a seat (120), a cage (130), a plunger (140), a shaft (150), a bonnet (160), a cap (170), and a leak-prevention seal (180).

[0024] The body (110) forms the outer shape of the bonnet valve (100) according to the present invention and is made of various materials having rigidity.

[0025] At this time, the body (110) has an inlet (111) formed open on one side of the circumferential surface and an outlet (112) formed open on the other side. Then, the body (110) forms a flow passage (113) inside to connect the inlet (111) and the outlet (112) to guide the passage of fluid.

[0026] So, the fluid flows into the interior of the body (110) through the inlet (111), passes through the flow passage (113), and is discharged to the outside of the body (110) through the outlet (112).

[0027] At this time, the flow passage (113) spanning the inlet (111) and the outlet (112) is formed in an approximately 'S' shape to reduce impact during fluid flow. Of course, the body (110), inlet (111), outlet (112), and flow passage (113) can be modified into various shapes.

[0028] In addition, the body (110) forms an opening (114) that opens upward or downward. For convenience, the opening (114) is shown as being formed to open upward on the body (110). At this time, the opening (114) is formed to be connected to a flow passage (113).

[0029] The seat (120) is placed at a set position in the flow passage (113). At this time, the body (110) corresponding to the part located in a straight line with the opening (114) in the trajectory of the flow passage (113) forms a seating ledge (115), and the seat (120) is placed on the seating ledge (115) and fixed in position. The seat (120) can be made of various materials having rigidity.

[0030] At this time, the seat (120) may include a seating frame (122) and a mounting frame (124).

[0031] The mounting frame (122) is provided in contact with the mounting ledge (115). At this time, the mounting frame (122) has a first flow hole (123) through it to allow fluid to pass from one direction to the other. Thus, the mounting frame (122) is formed in a ring shape.

[0032] And, the mounting frame (124) extends from the seating frame (122) and is fitted into the corresponding position of the flow passage (113). This is to secure the seat (120) to the inside of the body (110).

[0033] The mounting frame (124) has a second flow hole (125) through it at the corresponding location. Accordingly, the fluid introduced through the inlet (111) is guided to be discharged to the outlet (112) after passing through the first flow hole (123) and the second flow hole (125) along the trajectory of the flow passage (113). Of course, the mounting frame (124) can be formed in various shapes.

[0034] The cage (130) is placed on a seat (120) that is fixedly installed on the flow passage (113). At this time, the cage (130) is formed to be open on both sides along the axial direction. Thus, the cage (130) is formed in a tubular shape. Of course, the cage (130) may also be formed to be open only to the side of the other seat (120) along the axial direction.

[0035] The seat (120), particularly the mounting frame (122), may have a positioning projection (126) formed to protrude continuously or discontinuously along a circumferential trajectory to fix the position of the cage (130). By the positioning projection (126) contacting the inner surface of the other side of the cage (130) at multiple points, the cage (130) can be fixed to the seat (120).

[0036] In addition, the cage (130) has a plurality of opening holes (132) through its circumference. Thus, fluid flowing in from the inlet (111) is transported into the interior of the cage (130) through the opening holes (132) and then guided to be discharged toward the outlet (112) along the first flow hole (123) and the second flow hole (125).

[0037] The cage (130) can be formed in various shapes and can be made of various materials having rigidity.

[0038] A plunger (140) is provided on the inside of a cage (130) which is cylindrical or polygonal in shape. At this time, most of the outer circumference of the plunger (140) comes into contact with the inner surface of the cage (130). Thus, the plunger (140) serves to block or open the opening hole (132) at the corresponding location.

[0039] The shaft (150) is fixedly connected to the plunger (140) and extends to one side along the axial direction of the cage (130) and is exposed to the outside of the body (110). Then, the shaft (150) can move in both directions along the axial direction by an external force. Accordingly, the plunger (140) can adjust the opening amount of a plurality of opening holes (132) in conjunction with the axial movement of the shaft (150).

[0040] The hood (160) presses one side, specifically the upper side, of the cage (130) exposed through the opening (114) of the body (110) to apply pressure toward the seat (120).

[0041] At this time, the hood (160) may include a sleeve (162) and a press rib (164).

[0042] The sleeve (162) is formed in a tubular shape and axially inserts the shaft (150). Thus, the shaft (150) can be exposed to the outside of the body (110). The sleeve (162) can be made of various materials having various shapes and rigidities.

[0043] The press rib (164) extends outward from one edge along the axial direction of the sleeve (162) and serves to directly press one side of the plunger (140).

[0044] At this time, the press rib (164) can press against one side of the cage (130) along the entire circumferential direction.

[0045] The press rib (164) can maintain a pressure position on one side of the cage (130), and the cage (130) can be positioned by being constrained to the press rib (164).

[0046] To this end, the cage (130) may form a first protrusion (133) protruding continuously or discontinuously along the circumferential direction on one side, and the press rib (164) may extend and form a second protrusion (163) in contact with the outer surface of the first protrusion (133). Thus, the cage (130) may be constrained to the press rib (164). Of course, the first protrusion (133) and the second protrusion (163) may be formed in various shapes.

[0047] The cap (170) is detachably connected to the body (110) and presses the bonnet (160) toward the cage (130).

[0048] In particular, the cap (170) has an exposed hole (172) through it, and the sleeve (162) of the hood (160) is inserted into the exposed hole (172) and protrudes outward from the cap (170). In addition, the cap (170) is firmly fastened to the body (110) by a fastening member (174).

[0049] Meanwhile, if the fluid is at a high temperature and high pressure, it may leak out through the gap between the press rib (164) of the hood (160) and the cap (170).

[0050] To suppress this, a leakage suppression seal (180) is provided.

[0051] That is, the leak-prevention seal (180) is inserted into the opening (114) while mounted on the outer surface of the body (110), and the hood (160) is pressed toward the cage (130) by the pressing force of the cap (170).

[0052] Thus, as the leak-prevention seal (180) presses the cage (130) downward, the cage (130) presses the sheet (120) toward the seating edge (115) of the body (110), thereby firmly sealing or packing the gap between the sheet (120) and the body (110).

[0053] Accordingly, since the sheet (120) can be configured to be detachable without being welded or integrated with the body (110), individual maintenance is possible.

[0054] The leak-prevention seal (180) may be made of a metal material to increase durability and expand elastic deformation.

[0055] In particular, the pressure of the leak-prevention seal (180) is increased by the pressure of the internal fluid of the body (110).

[0056] In detail, the leak-prevention seal (180) includes a ring pad (182) and a flange (184).

[0057] The ring pad (182) is placed on the surface of the body (110) along the edge of the opening (114), and a connecting hole portion (183) corresponding to the opening (114), that is, matching the opening (114), is formed to be open on both sides. Thus, the ring pad (182) is formed in a ring shape.

[0058] The flange (184) extends from the ring pad (182) to the other side along the edge of the communication hole portion (183) and is fitted into the opening (114). In addition, the flange (184) presses the bonnet (160) toward the cage (130) side.

[0059] In particular, as the cap (170) presses the leak-prevention seal (180), the leak-prevention seal (180) is deformed and adheres to the inner surface of the opening (114), and presses the press rib (164) of the bonnet (160) toward the cage (130).

[0060] In addition, as the internal pressure of the body (110) increases due to the fluid, the leak-prevention seal (180) is pressurized by the force that causes the press rib (164) of the bonnet (160) to move toward the cap (170), thereby increasing the sealing force on the contact surface between the leak-prevention seal (180) and the cap (170).

[0061] As the cage (130) is pressed downward by the leak-prevention seal (180), the sealing force is maximized, so that the cage (130) and the seat (120) can be separated from and replaced with the body (110).

[0062] At this time, the flange (184) can form a first inclined surface (185), and the press rib (164) of the bonnet (160) can form a second inclined surface (165) that contacts the first inclined surface (185). Thus, the downward pressure and pressure efficiency of the leak-prevention seal (180) can be increased.

[0063] Consequently, the non-gasket type bolted bonnet valve (100) according to the present invention is formed such that a metal leak-inhibiting seal (180) directly presses the bonnet (160) toward the cage (130), thereby pressing the cage (130) and the seat (120) downward to maximize or maintain the sealing force, and thus the seat (120) and the cage (130) can be separated from the body (110).

[0064] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of protection of the present invention should be determined by the claims below. Explanation of the symbols

[0065] 100: Hood valve 110: Body 111: Entrance 112: Exit 113: Flow passage 115: Settlement ledge 120: Seat 122: Mounting frame 123: 1st movable hole 124: Mounting frame 125: Second fluid hole 126: Positioning protrusion 130: Cage 132: Frog hole 133: 1st projection 140: Plunger 150: Shaft 160: Hood 162: Sleeve 163: Second protrusion 164: Press rib 165: Second inclined surface 170: Cap 172: Exposure hole 174: Fastening member 180: Leakage-prevention seal 182: Ring pad 183: Chimney hole 184: Flange 185: First inclined surface

Claims

Claim 1 A body having an inlet and an outlet formed through an internal fluid passage and an opening connected to the fluid passage; a cage provided in the fluid passage, having a plurality of opening holes through its circumferential surface and formed to be open to at least one side along the axial direction, guiding fluid flowing in from the inlet into the interior and then guiding it to be discharged toward the outlet; a bonnet pressing and applying pressure to one side of the cage exposed through the opening; a cap detachably coupled to the body and applying pressure to the bonnet toward the cage; and a leak-prevention seal mounted on the outer surface of the body and inserted into the opening, and applying pressure to the bonnet toward the cage by the pressing force of the cap, wherein the bonnet comprises a tubular sleeve; A non-gasket type bolted bonnet valve characterized by including a press rib extending outward from one side of the sleeve and pressing one side of the cage along the circumferential direction, wherein the cage includes a first protrusion formed along the circumferential direction on one side, and the press rib includes a second protrusion in contact with the first protrusion to restrain the position of the cage. Claim 2 A non-gasket type bolted bonnet valve according to claim 1, characterized by comprising: a seat that is seated at a set position of the fluid passage, supports the cage, and guides the flow of fluid in the fluid passage; a plunger provided on the inner side of the cage, which is cylindrical or polygonal in shape; and a shaft that is fixedly connected to the plunger, is exposed to the outside through the bonnet, and moves the plunger by moving axially by an external force to adjust the opening amount of the opening hole. Claim 3 A non-gasket type bolted bonnet valve characterized in that, in claim 1, the leakage suppression seal is made of a metal material. Claim 4 A non-gasket type bolted bonnet valve characterized in that, in claim 1, the pressurizing force of the leakage-prevention seal is increased by the pressure of the internal fluid. Claim 5 A non-gasket type bolted bonnet valve according to claim 2, characterized in that the cage can be separated from and replaced from the body together with the seat as it is pressed downward by the leakage suppression seal. Claim 6 A non-gasket type bolted bonnet valve according to any one of claims 1 to 5, wherein the leakage suppression seal comprises: a ring pad placed on the body along the edge of the opening and having communication holes corresponding to the opening formed to be open on both sides; and a flange extending from the ring pad to the other side along the edge of the communication holes, fitted into the opening, and pressing the bonnet toward the cage side. Claim 7 A non-gasket type bolted bonnet valve according to claim 6, characterized in that the flange forms a first inclined surface and the bonnet forms a second inclined surface in contact with the first inclined surface.

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