Flange-rotary fireproof one-way valve

Abstract

The present application relates to the technical fields of single flow valve, and discloses a flange rotary fireproof single flow valve, which comprises a valve body and a valve cover, an assembling part is arranged between the valve body and the valve cover, the assembling part comprises a valve assembly, the valve assembly comprises a valve seat cover arranged on the right side of the valve cover, and a sealing part is arranged between the valve seat and the valve cover, in the case of high temperature, the rubber gasket ring is softened and decomposed, at this time, the V-shaped spring ring that is extruded can release the elastic force to the right side, the softened rubber gasket ring is extruded, the elastic performance of the V-shaped spring ring as a whole can be released step by step by the gradually melted rubber gasket ring, the melted rubber gasket ring is extruded to be stored in the inside of the plurality of rectangular grooves one and rectangular grooves two, the melted rubber gasket ring residue is prevented from leaking into the channel through the gap to pollute the medium, and at this time, the right side protruding blocks of the metal gasket ring one and the metal gasket ring two are in contact to perform hard sealing, the two are alternated to ensure the fireproof sealing effect of the whole one-way valve, and the safe and stable operation of the valve is ensured.

Description

Technical Field

[0001] This invention relates to the field of check valves, and more specifically, to a flange-rotating fireproof check valve. Background Technology

[0002] The check valve used in fracturing operations is a key safety component of the high-pressure fluid control system. It needs to meet the requirements of high flow rate, ultra-high pressure, fast closing response, erosion resistance, and even fire protection requirements so that it can work normally in the event of a fire and achieve timely blocking of the medium in the flow channel. The check valve is a valve that uses the fluid pressure difference to achieve automatic opening and closing. The fluid enters from the inlet, and the pressure pushes the valve disc to overcome the weight of the valve disc, opening the flow channel to allow the fluid to flow in the forward direction. When the fluid flows in the reverse direction, the pressure on the outlet side and the weight of the valve disc work together to press the valve disc tightly on the valve seat, forming a seal to block backflow.

[0003] Existing fireproof check valves all use a combination of soft and hard seals to seal the sealing parts. However, under high-temperature conditions, the traditional combination method may cause the rubber gasket to soften and melt, allowing the melted residue to leak into the channel and contaminate the medium, thus affecting the safe and stable operation of the valve. At the same time, gaps will remain at the softened rubber gasket, affecting the overall sealing effect. Summary of the Invention

[0004] This invention provides a flange-rotating fireproof single-flow valve, which solves the technical problem in related technologies that, under high-temperature conditions, the traditional overlapping method may cause the rubber gasket to soften and melt, resulting in the melted residue leaking into the channel and contaminating the medium, thus affecting the safe and stable operation of the valve. At the same time, the softened rubber gasket will leave gaps that affect the overall sealing effect.

[0005] This invention provides a flanged rotary fireproof check valve, including a valve body and a valve cover, with an assembly part between the valve body and the valve cover. The assembly part includes a valve assembly, which includes a valve seat disposed on the right side of the valve cover. A sealing part is provided between the valve cover and the valve seat, and the sealing part is used to provide a fireproof seal for the connection part of the assembly part.

[0006] The sealing part includes a sealing groove formed on the mating surface between the valve seat and the valve cover. The sealing groove is an annular groove. A sealing component and a compression component are provided inside the sealing groove. The sealing component includes a metal gasket ring 1 provided on the inner wall of the sealing groove. A cavity is provided on the side of the metal gasket ring 1 near the valve seat. A V-shaped spring ring is provided on the inner wall of the cavity of the metal gasket ring 1. A rubber gasket ring is provided on the inner wall of the cavity of the metal gasket ring 1.

[0007] The inner wall of the sealing groove is provided with a second metal gasket, which is in contact with the rubber gasket and the first metal gasket.

[0008] Under high temperatures, the rubber gasket ring softens and melts, causing it to lose its sealing function. At this time, the compressed V-shaped spring ring releases its rebound force to the right, compressing the softened rubber gasket ring. Because the V-shaped spring ring has multiple rectangular grooves, the overall elasticity of the V-shaped spring ring can be released step by step by the gradually melting rubber gasket ring. The melted rubber gasket ring is compressed and stored inside the multiple rectangular grooves, preventing the melted rubber gasket ring residue from leaking into the channel through gaps and contaminating the medium. Furthermore, when the medium is flowing under high pressure, it will pass through the connecting groove and compress the top ring. The top ring moves to the right and compresses the metal gasket ring, so that after the rubber gasket ring melts, the metal gasket ring 1 and the right-side protrusion of the metal gasket ring 2 come into contact and form a hard seal, achieving a seamless connection.

[0009] In a preferred embodiment, the extrusion assembly includes a top ring disposed on the inner wall of the sealing groove, the top ring being located to the left of the metal gasket ring.

[0010] In a preferred embodiment, the inner wall of the valve cover is provided with a plurality of connecting grooves, all of which are connected to the sealing groove.

[0011] In a preferred embodiment, a plurality of rectangular grooves 1 and 2 are respectively provided on the left and right sides of the outer wall of the V-shaped spring ring, and the plurality of rectangular grooves 1 and 2 are arranged alternately in sequence.

[0012] In a preferred embodiment, a valve disc is hinged to the valve seat, and the assembly part further includes a splicing component, which includes a splicing step disposed on the left side of the valve body, the splicing step being abutted against the right side of the valve seat.

[0013] In a preferred embodiment, the outer wall of the valve seat is fitted with a fireproof sealing ring and a valve seat sealing ring, both of which are installed at the connection between the valve body and the valve disc to seal it.

[0014] In a preferred embodiment, both the outer walls of the valve body and the valve cover are fixedly connected with connecting rings, and the two connecting rings are fixed together by bolts.

[0015] In a preferred embodiment, a connecting portion is provided at one end of the valve body and the valve cover that are far apart from each other. The connecting portion includes a fixing ring that is fixedly connected to the outer wall of the right side of the valve body and the outer wall of the left side of the valve cover. A fixing ring step is fixedly connected to the outer wall of the two fixing rings. A rotating flange is rotatably connected to the outer wall of the fixing ring step. Several steel balls are provided at the rotatable connection between the fixing ring and the rotating flange.

[0016] In a preferred embodiment, each of the two fixing rings is provided with a clamping ring, which is located around the periphery of a plurality of steel balls.

[0017] In a preferred embodiment, a retaining ring is fixedly connected to the inner wall of the retaining ring, and a plurality of screws are threaded onto the retaining ring, the screws being in contact with the clamping ring.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. In this invention, the rubber gasket ring softens and melts under high temperatures, causing its sealing function to fail. At this time, the compressed V-shaped spring ring releases its rebound force to the right, compressing the softened rubber gasket ring. Because the V-shaped spring ring has multiple rectangular grooves, the overall elasticity of the V-shaped spring ring can be released step by step by the gradually melting rubber gasket ring. The melted rubber gasket ring is compressed and stored inside the multiple rectangular grooves, preventing the melted rubber gasket ring residue from leaking into the channel through gaps and contaminating the medium. Furthermore, when the medium is flowing under high pressure, it will pass through the connecting groove and compress the top ring. The top ring moves to the right and compresses the metal gasket ring. After the rubber gasket ring melts, the metal gasket ring 1 and the right-side protrusion of the metal gasket ring 2 come into contact and form a hard seal, achieving a seamless connection. The alternation of the two ensures the fireproof sealing effect of the overall one-way valve and guarantees the safe and stable operation of the valve.

[0020] 2. Before installing the valve body and valve cover, the present invention presses a V-shaped spring ring into the cavity of the first metal gasket, with the tip of the V-shaped spring ring facing to the right. The sealing assembly is then pressed into the cavity of the first metal gasket. After placing the second metal gasket into the sealing groove of the valve seat, the assembled first metal gasket is placed into the sealing groove of the valve cover. As the valve seat and valve cover are assembled and compressed, the rubber gasket deforms under the compression of the V-shaped spring ring and the second metal gasket, sealing the connection. By utilizing the deformation characteristics of the rubber gasket and the compression of the V-shaped spring ring and the second metal gasket, a highly efficient and reliable sealing structure is formed, providing a strong guarantee for the stable operation of the valve under different working conditions.

[0021] 3. During the assembly process of the valve body and valve cover of the present invention, the valve seat is preferentially attached to the right side of the valve cover, so that the side surface of the valve seat that is hinged to the valve disc is away from the right side of the valve cover. The valve body is then inserted into the inner wall of the right side of the valve cover, so that the splicing step on the left side of the valve body abuts against the right side of the valve seat and presses it onto the right side surface of the valve cover. Before installation, the fireproof sealing ring and the valve seat sealing ring are fitted onto the outer wall of the valve seat to perform preliminary sealing of the connection between the valve seat and the valve body, forming an internal seal in the valve cavity and bearing internal pressure. After assembly, the preset holes and grooves on the two connecting rings are aligned with each other and fixed with bolts and nuts. At the same time, the connection is pressed to achieve a tight sealing connection. This assembly process is simple and convenient, greatly improving the adaptability of the overall valve. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall cross-sectional three-dimensional structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 3 This is a schematic diagram of the explosion effect of the present invention.

[0025] Figure 4 This is a schematic diagram of the sealing component in this invention.

[0026] Figure 5 This is a schematic diagram of the V-shaped spring coil in this invention.

[0027] Figure 6 This is a schematic diagram of the overall cross-sectional structure of the present invention.

[0028] Figure 7 This is the present invention. Figure 6 An enlarged schematic diagram of the structure at point A.

[0029] Figure 8 This is the present invention. Figure 6 Enlarged schematic diagram of the structure at point B.

[0030] Figure 9 This is the present invention. Figure 6 A magnified schematic diagram of the structure at point C.

[0031] In the diagram: 1. Valve body; 2. Valve cover; 3. Assembly part; 4. Sealing part; 5. Connecting part;

[0032] 31. Valve assembly; 32. Splicing assembly; 32a. Fireproof sealing ring; 32b. Valve seat sealing ring;

[0033] 311. Valve seat; 312. Valve disc;

[0034] 321. Connecting steps; 322. Connecting ring;

[0035] 41. Sealing groove; 42. Sealing assembly; 43. Extrusion assembly;

[0036] 421. Metal washer ring one; 422. V-shaped spring ring; 422a. Rectangular groove one; 422b. Rectangular groove two; 423. Rubber washer ring; 424. Metal washer ring two;

[0037] 431. Top ring; 432. Connecting groove;

[0038] 51. Retaining ring; 52. Rotary flange; 53. Steel ball; 53b. Retaining ring step; 54. Compression ring; 55. Retaining ring; 56. Screw. Detailed Implementation

[0039] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0040] like Figures 1 to 9 As shown, a flanged rotary fireproof check valve includes a valve body 1 and a valve cover 2. An assembly part 3 is provided between the valve body 1 and the valve cover 2. The assembly part 3 includes a valve assembly 31. The valve assembly 31 includes a valve seat 311 provided on the right side of the valve cover 2. A sealing part 4 is provided between the valve cover 2 and the valve seat 311. The sealing part 4 is used to fireproof seal the connection part of the assembly part 3.

[0041] The sealing part 4 includes a sealing groove 41 formed on the mating surface between the valve seat 311 and the valve cover 2. The sealing groove 41 is an annular groove. The sealing groove 41 is provided with a sealing assembly 42 and a compression assembly 43. The sealing assembly 42 includes a metal gasket 421 provided on the inner wall of the sealing groove 41. A cavity is provided on the side of the metal gasket 421 near the valve seat 311. A V-shaped spring ring 422 is provided on the inner wall of the cavity of the metal gasket 421. A rubber gasket 423 is provided on the inner wall of the cavity of the metal gasket 421.

[0042] The inner wall of the sealing groove 41 is provided with a second metal gasket 424, which is in contact with the rubber gasket 423 and the first metal gasket 421.

[0043] It should be noted that the sealing assembly 42 is composed of a metal gasket 421, a V-shaped spring ring 422, a rubber gasket 423, and a metal gasket 424, which is easy to disassemble and disassemble, so that it can be replaced after damage.

[0044] In this embodiment, the specific implementation scenario is as follows: before installing the valve body 1 and the valve cover 2, the V-shaped spring ring 422 is pressed into the cavity of the metal gasket 421, so that the tip of the V-shaped spring ring 422 faces to the right, and the sealing assembly 42 is pressed into the cavity of the metal gasket 421. After the metal gasket 424 is placed into the sealing groove 41 of the valve seat 311, the assembled metal gasket 421 is placed into the sealing groove 41 of the valve cover 2. While the valve seat 311 and the valve cover 2 are assembled and squeezed, the rubber gasket 423 is deformed under the squeezing action of the V-shaped spring ring 422 and the metal gasket 424, thus sealing the connection.

[0045] Under high temperatures, the rubber gasket 423 softens and melts, causing it to lose its sealing function. At this point, the compressed V-shaped spring ring 422 releases its rebound force to the right, compressing the softened rubber gasket 423. Because the V-shaped spring ring 422 has multiple rectangular grooves 422a and 422b, the overall elasticity of the V-shaped spring ring 422 is gradually released by the melting rubber gasket 423. This compression forces the melted rubber gasket 423 into the interior of the rectangular grooves 422a and 422b for storage, preventing residue from leaking into the channel through gaps. The medium causes contamination, and when the medium is flowing under high pressure, it will pass through the inside of the connecting groove 432 and squeeze the top ring 431. The top ring 431 moves to the right and squeezes the metal gasket 421. After the rubber gasket 423 melts, the metal gasket 421 and the right side protrusion of the metal gasket 424 come into contact and form a hard seal. The two alternate to ensure the fireproof sealing effect of the overall one-way valve and ensure the safe and stable operation of the valve. Compared with the sealing of the fireproof sealing ring 32a and the valve seat sealing ring 32b, this sealing effect prevents external leakage and cross-cavity between the valve seat 311 and the valve body 1. It is used for pressure boundary sealing and directly bears external pressure.

[0046] like Figure 8 As shown, the extrusion assembly 43 includes a top ring 431 disposed on the inner wall of the sealing groove 41, and the top ring 431 is located to the left of the metal gasket ring 421.

[0047] It should be noted that the top ring 431 and the sealing groove 41 are in sealing contact, so that when the top ring 431 moves to the right, it can press against the metal gasket ring 421 and move to the right.

[0048] like Figure 8 As shown, the inner wall of the valve cover 2 is provided with several connecting grooves 432, and all of the connecting grooves 432 are connected to the sealing groove 41.

[0049] It should be noted that the connecting groove 432 is connected to the valve cavity, allowing the medium to squeeze the top ring 431 to move to the right through the connecting groove 432.

[0050] like Figure 5 As shown, the outer wall of the V-shaped spring coil 422 has several rectangular grooves 422a and 422b on the left and right sides respectively, and the rectangular grooves 422a and 422b are arranged alternately in sequence.

[0051] It should be noted that the sealing assembly 42 is composed of a metal gasket 421, a V-shaped spring ring 422, a rubber gasket 423, and a metal gasket 424, which are easy to disassemble and disassemble, so that it can be replaced after damage.

[0052] like Figures 3 to 6As shown, a valve disc 312 is hinged to the valve seat 311. The assembly part 3 also includes a splicing component 32. The splicing component 32 includes a splicing step 321 disposed on the left side of the valve body 1. The splicing step 321 is in contact with the right side of the valve seat 311.

[0053] It should be noted that the valve seat 311 and the valve disc 312 are combined to form the valve assembly 31. A torsion spring is provided at the hinge of the two, and the contact surface between the valve disc 312 and the valve seat 311 is set as an inclined surface at a 30° angle, so that the valve disc 312 is in contact with the valve seat 311 under the action of gravity and the torsion spring to form a one-way valve passage. The valve seat 311 is pressed between the valve body 1 and the valve cover 2 to form a splicing effect, making assembly more convenient.

[0054] like Figure 7 As shown, the outer wall of the valve seat 311 is fitted with a fireproof sealing ring 32a and a valve seat sealing ring 32b. Both the fireproof sealing ring 32a and the valve seat sealing ring 32b are installed at the connection between the valve body 1 and the valve disc 312 to seal it.

[0055] It should be noted that the fireproof sealing ring 32a and the valve seat sealing ring 32b seal and bear pressure inside the valve cavity to prevent the medium from leaking out from between the valve seat 311 and the valve body 1 and from entering the cavity. They mainly function as auxiliary seals and pre-tightening seals.

[0056] like Figure 6 As shown, both the outer walls of the valve body 1 and the valve cover 2 are fixedly connected with connecting rings 322, and the two connecting rings 322 are fixed together by bolts.

[0057] In this embodiment, the specific implementation scenario is as follows: During the assembly process between the valve body 1 and the valve cover 2, the valve seat 311 is first attached to the right side of the valve cover 2, so that the side surface of the valve seat 311 with the hinged valve disc 312 is away from the right side of the valve cover 2. The valve body 1 is then inserted into the inner wall of the right side of the valve cover 2, so that the splicing step 321 on the left side of the valve body 1 abuts against the right side of the valve seat 311 and presses it onto the right side surface of the valve cover 2. Before installation, the fireproof sealing ring 32a and the valve seat sealing ring 32b are fitted onto the outer wall of the valve seat 311 to perform preliminary sealing on the connection between the valve seat 311 and the valve body 1, forming an internal seal in the valve cavity and bearing internal pressure. After assembly, the pre-set holes and grooves on the two connecting rings 322 are aligned with each other and fixed with bolts and nuts. At the same time, the connection is pressed to achieve a tight sealing connection.

[0058] like Figure 9 As shown, the connecting part 5 includes a fixing ring 51 that is fixedly connected to the outer wall of the right side of the valve body 1 and the outer wall of the left side of the valve cover 2. The outer walls of the two fixing rings 51 are fixedly connected to a fixing ring step 53b. The outer wall of the fixing ring step 53b is rotatably connected to a rotating flange 52. Several steel balls 53 are provided at the rotatable connection between the fixing rings 51 and the rotating flange 52.

[0059] This allows the slots on the rotating flange 52 to adjust their installation position during rotation, and the filling portions of the retaining ring step 53b and multiple steel balls 53 can limit the rotation of the rotating flange 52.

[0060] like Figure 9 As shown, each of the two fixing rings 51 is provided with a clamping ring 54, which is located around a number of steel balls 53.

[0061] This allows the clamping ring 54 to be fixed inside the groove of the fixing ring 51 to limit the rolling of multiple steel balls 53 and prevent the steel balls 53 from being misaligned during rolling.

[0062] like Figure 9 As shown, a retaining ring 55 is fixedly connected to the inner wall of the retaining ring 51, and several screws 56 are threadedly connected to the retaining ring 55. The screws 56 are in contact with the clamping ring 54.

[0063] This allows multiple screws 56 to fix the position of the clamping ring 54, preventing the clamping ring 54 from loosening and affecting the rolling of the steel ball 53.

[0064] In this embodiment, the specific implementation scenario is as follows: After the overall valve is assembled, since the valve disc 312 on the valve seat 311 needs to remain closed under the action of gravity under normal conditions, it is necessary to adjust the angle of the flange connection between the overall valve and the pipeline. The valve is provided with rotatable rotating flanges 52 on both the left and right sides, so that the slots on the rotating flanges 52 can be adjusted in installation position when rotating. The filling part of the fixed ring step 53b and multiple steel balls 53 can limit the rotation of the rotating flange 52. The multiple screws 56 on the rotating retaining ring 55 apply pressure to the clamping ring 54, so that the clamping ring 54 can be fixed in the groove of the fixed ring 51 to limit the rolling of multiple steel balls 53, effectively reducing the resistance to the rotation of the rotating flange 52 and realizing easy rotation of the flange.

[0065] Working principle:

[0066] 1. During the assembly process between valve body 1 and valve cover 2, valve seat 311 is first attached to the right side of valve cover 2, so that the side surface of valve seat 311 with hinged valve disc 312 is away from the right side of valve cover 2. Valve body 1 is then inserted into the inner wall of the right side of valve cover 2, so that the splicing step 321 on the left side of valve body 1 abuts against the right side of valve seat 311 and presses it onto the right side surface of valve cover 2. Before installation, fireproof sealing ring 32a and valve seat sealing ring 32b are fitted on the outer wall of valve seat 311 to perform preliminary sealing of the connection between valve seat 311 and valve body 1, forming an internal seal of the valve cavity and bearing internal pressure. After assembly, the pre-set holes and grooves on the two connecting rings 322 are aligned with each other and fixed with bolts and nuts. At the same time, the connection is pressed to achieve a tight sealing connection. This assembly process is simple and convenient, greatly improving the adaptability of the overall valve.

[0067] 2. Before installing the valve body 1 and the valve cover 2, press the V-shaped spring ring 422 into the cavity of the metal washer 421, so that the tip of the V-shaped spring ring 422 faces to the right, and press the sealing assembly 42 into the cavity of the metal washer 421. After placing the metal washer 424 into the sealing groove 41 of the valve seat 311, place the assembled metal washer 421 into the sealing groove 41 of the valve cover 2. While the valve seat 311 and the valve cover 2 are assembled and squeezed, the rubber washer 423 is deformed under the squeezing action of the V-shaped spring ring 422 and the metal washer 424, thus sealing the connection.

[0068] Third, under high temperatures, the rubber gasket ring 423 softens and melts, causing its sealing function to fail. At this time, the compressed V-shaped spring ring 422 will release its rebound force to the right, compressing the softened rubber gasket ring 423. Because the V-shaped spring ring 422 has multiple rectangular grooves 422a and 422b, the overall elasticity of the V-shaped spring ring 422 can be released step by step by the gradually melting rubber gasket ring 423. This compresses the melted rubber gasket ring 423, forcing it into the interior of the rectangular grooves 422a and 422b for storage, preventing residue of the melted rubber gasket ring 423 from leaking into the channel through gaps. The medium is contaminated, and when the medium is flowing under high pressure, it will pass through the inside of the connecting groove 432 and squeeze the top ring 431. The top ring 431 moves to the right and squeezes the metal gasket 421. After the rubber gasket 423 melts, the metal gasket 421 and the right side protrusion of the metal gasket 424 come into contact to form a hard seal. The two alternate to ensure the fireproof sealing effect of the overall one-way valve and ensure the safe and stable operation of the valve. Compared with the sealing of the fireproof sealing ring 32a and the valve seat sealing ring 32b, this sealing effect prevents external leakage and cross-cavity between the valve seat 311 and the valve body 1. It is used for pressure boundary sealing and directly bears external pressure.

[0069] IV. After the overall valve is assembled, since the valve disc 312 on the valve seat 311 needs to remain closed under the action of gravity under normal conditions, it is necessary to adjust the angle of the flange connection between the overall valve and the pipeline. The valve is equipped with rotatable rotating flanges 52 on both the left and right sides, so that the slots on the rotating flanges 52 can be adjusted in position when rotating. The filling parts of the fixed ring step 53b and multiple steel balls 53 can limit the rotation of the rotating flange 52. The multiple screws 56 on the rotating retaining ring 55 apply pressure to the clamping ring 54, so that the clamping ring 54 can be fixed in the groove of the fixed ring 51 to limit the rolling of multiple steel balls 53, effectively reducing the resistance to the rotation of the rotating flange 52 and realizing easy rotation of the flange.

[0070] The embodiments of this example have been described above. However, this example is not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this example, and all of them are within the protection scope of this example.

Claims

1. A flanged rotary fireproof check valve, characterized in that, The assembly includes a valve body (1) and a valve cover (2). An assembly part (3) is provided between the valve body (1) and the valve cover (2). The assembly part (3) includes a valve assembly (31). The valve assembly (31) includes a valve seat (311) provided on the right side of the valve cover (2). A sealing part (4) is provided between the valve cover (2) and the valve seat (311). The sealing part (4) is used to fireproof seal the connection part of the assembly part (3). The sealing part (4) includes a sealing groove (41) formed on the mating surface between the valve seat (311) and the valve cover (2). The sealing groove (41) is an annular groove. The sealing groove (41) is provided with a sealing assembly (42) and a compression assembly (43). The sealing assembly (42) includes a metal gasket (421) provided on the inner wall of the sealing groove (41). A cavity is provided on the side of the metal gasket (421) near the valve seat (311). A V-shaped spring ring (422) is provided on the inner wall of the cavity of the metal gasket (421). A rubber gasket (423) is provided on the inner wall of the cavity of the metal gasket (421). The inner wall of the sealing groove (41) is provided with a metal gasket two (424), which is in contact with the rubber gasket (423) and the metal gasket two (424) is in contact with the metal gasket one (421); The extrusion assembly (43) includes a top ring (431) disposed on the inner wall of the sealing groove (41), the top ring (431) being located to the left of the metal gasket ring (421); The inner wall of the valve cover (2) is provided with a plurality of connecting grooves (432), and the plurality of connecting grooves (432) are connected to the sealing groove (41); The outer wall of the V-shaped spring coil (422) has several rectangular grooves 1 (422a) and 2 (422b) respectively on the left and right sides, and the rectangular grooves 1 (422a) and 2 (422b) are arranged alternately in sequence.

2. The flanged rotary fireproof check valve according to claim 1, characterized in that, A valve disc (312) is hinged to the valve seat (311), and the assembly part (3) further includes a splicing component (32). The splicing component (32) includes a splicing step (321) disposed on the left side of the valve body (1). The splicing step (321) is in contact with the right side of the valve seat (311).

3. A flanged rotary fireproof check valve according to claim 2, characterized in that, The outer wall of the valve seat (311) is fitted with a fireproof sealing ring (32a) and a valve seat sealing ring (32b), which are both installed at the connection between the valve body (1) and the valve disc (312) to seal it.

4. A flanged rotary fireproof check valve according to claim 3, characterized in that, The outer walls of the valve body (1) and the valve cover (2) are both fixedly connected with connecting rings (322), and the two connecting rings (322) are fixed together by bolts.

5. A flanged rotary fireproof check valve according to claim 4, characterized in that, The valve body (1) and the valve cover (2) are provided with a connecting part (5) at their opposite ends. The connecting part (5) includes a fixing ring (51) that is fixedly connected to the outer wall of the right side of the valve body (1) and the outer wall of the left side of the valve cover (2). The outer walls of the two fixing rings (51) are fixedly connected with a fixing ring step (53b). The outer wall of the fixing ring step (53b) is rotatably connected with a rotating flange (52). Several steel balls (53) are provided at the rotatable connection between the fixing ring (51) and the rotating flange (52).

6. A flanged rotary fireproof check valve according to claim 5, characterized in that, Both of the fixed rings (51) are provided with clamping rings (54), which are located around a plurality of steel balls (53).

7. A flanged rotary fireproof check valve according to claim 6, characterized in that, A retaining ring (55) is fixedly connected to the inner wall of the fixing ring (51), and a number of screws (56) are threaded onto the retaining ring (55). The screws (56) are in contact with the clamping ring (54).

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