Combined fire-retardant breather valve

Abstract

The utility model provides a combined fire-retardant breather valve which comprises a shell, a pressure end assembly and a vacuum end assembly are arranged in the shell, the vacuum end assembly is located above the pressure end assembly, the top end of the shell is connected with a valve deck, the vacuum end assembly is connected with the valve deck through a limiting valve rod, and the limiting valve rod is connected with the vacuum end assembly. The bottom end of the shell is connected with a base. Due to the design of the independent flow channels among the internal vacuum end assembly, the pressure end assembly and the valve element, the problem of circulation dead angles of a composite flow channel is solved. According to the utility model, fire retardance, pressure relief and vacuum relief are realized by one breather valve, and two safety protections are realized by one device through the innovative combination design, so that the total mass of the safety device is reduced, and the cost of the device is reduced. The independent air inlet and outlet channel is arranged below the valve body, so that the backpressure risk caused by the side air inlet and outlet channel is avoided. According to the utility model, short return seat pressure difference can be realized; before pressure relief, the sealing performance of the valve seat is excellent; after pressure relief, the valve seat is excellent in sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of fire-retardant breathing valves, in particular to a combined fire-retardant breathing valve. Background Art

[0002] The current mainstream combined flame arrester breathing valve cavity structure generally adopts a composite flow channel design. This composite flow channel creates dead spots, which can cause flow disturbances and turbulence within the valve. These disturbances and turbulence directly lead to design flaws such as flutter and partial lift of the valve disc during opening. Furthermore, the composite flow channel causes excessive pressure drop at the negative pressure end, indirectly resulting in poor stability of the valve disc during vacuum opening.

[0003] The positive pressure throat diameter of the current combined fire-stop breathing valve is smaller than the negative pressure throat diameter, which will cause the pressure end to release less than the vacuum end. When the pressure end releases enough but the vacuum end releases insufficiently, flutter will occur.

[0004] Furthermore, current combined fire-stop breathing valves utilize a side-mounted inlet and outlet design, which results in the fire-stop element being mounted to the side. To protect against rain, a pressure-end housing is typically added to the fire-stop element. While this hood design provides protection from rain, persistent wind from the opposite side can be drawn into the flow path by the pressure-end housing, directly leading to backpressure. This backpressure can prevent the valve from opening when required, creating new safety hazards and risks for the storage tank. Utility Model Content

[0005] The purpose of the present invention is to solve at least one of the above technical deficiencies.

[0006] To this end, one purpose of the present invention is to propose a combined fire-stop breathing valve to solve the problems mentioned in the background technology and overcome the shortcomings of the existing technology.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A combined fire-stop breathing valve includes a shell, in which a pressure end assembly and a vacuum end assembly are provided. The vacuum end assembly is located above the pressure end assembly. The top end of the shell is connected to a valve cover, and the vacuum end assembly is connected to the valve cover through a limiting valve stem. The bottom end of the shell is connected to a base.

[0009] Furthermore, the shell includes an outer wall, a valve core is provided in the outer wall, the valve core includes a first ring body and a second ring body, the first ring body is located above the second ring body, the first ring body and the second ring body are coaxial and connected, the inner diameter of the first ring body is larger than the inner diameter of the second ring body, a plurality of first windows are provided on the side of the first ring body, and a plurality of second windows are provided on the side of the second ring body.

[0010] Furthermore, the vacuum end assembly is arranged at the upper end opening of the first ring body, and the pressure end assembly is arranged at the upper end opening of the second ring body. The first ring body and the second ring body are connected to the inner surface of the outer wall through connecting ribs.

[0011] Furthermore, the pressure end assembly includes a pressure end valve seat, a pressure end valve disc and a pressure end valve stem, the pressure end valve disc cover is on the pressure end valve seat, a first diaphragm is provided between the pressure end valve disc and the pressure end valve seat, a first counterweight plate is provided above the pressure end valve disc, and the pressure end valve stem passes through the first counterweight plate, the pressure end valve disc, the first diaphragm and is fixedly connected to the pressure end valve seat.

[0012] Furthermore, the pressure end valve seat includes a ring seat and a connecting rod, the connecting rod is connected to the ring seat, the connecting rod is arranged at the center of the ring seat, a through hole is provided on the connecting rod, one end of the pressure end valve stem is connected to a third nut through the through hole, a guide sleeve is provided on the outer surface of the pressure end valve stem, and the end of the guide sleeve close to the pressure end valve seat is connected to a second nut, and the first diaphragm is located above the second nut.

[0013] Furthermore, the vacuum end assembly includes a vacuum end valve seat, a vacuum end valve disc and a limit valve stem, the vacuum end valve disc cover is on the vacuum end valve seat, a second diaphragm is provided between the vacuum end valve disc and the vacuum end valve seat, a second counterweight plate is provided above the vacuum end valve disc, and the limit valve stem passes through the second counterweight plate, the vacuum end valve disc, and the second diaphragm and is connected to a first nut.

[0014] Furthermore, a plurality of first screw holes are provided at the edge of the valve cover, the valve cover is connected to the top of the shell through a plurality of first bolts, a rod cap is provided at the center of the valve cover, and the end of the limiting valve rod away from the second counterweight plate extends into the rod cap.

[0015] Furthermore, a plurality of second screw holes are provided at the edge of the base, and the base is connected to the bottom end of the shell through a plurality of second bolts. A fire-blocking element is provided between the base and the shell, and a gasket is provided at the center of the upper surface of the fire-blocking element. The fire-blocking element is specifically a stainless steel fire-blocking core.

[0016] Furthermore, reserved interfaces are provided on both sides of the shell, the reserved interfaces are opposite to the first window, and the reserved interfaces are connected with hexagonal screw plugs.

[0017] Furthermore, the outer wall and the valve core are integrated.

[0018] Therefore, the utility model has the following beneficial effects:

[0019] The independent flow channel design between the vacuum end component, the pressure end component and the valve core in the combined fire-retardant breathing valve of the utility model eliminates the flow dead angle problem of the composite flow channel.

[0020] The utility model is a combined design, in which one breathing valve realizes fire blocking, pressure relief and vacuum relief. The innovative combined design solves two safety protections with one device, thereby reducing the total weight of the safety equipment and lowering the equipment cost.

[0021] The independent air inlet and outlet passages of the utility model are arranged below the valve body, thus avoiding the back pressure risk caused by the side air inlet and outlet passages.

[0022] The innovative integrated flame arrester structure design of the utility model can achieve a short return seat pressure difference; before pressure relief, the valve seat has excellent sealing performance; after pressure relief, the valve seat has excellent sealing performance.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 This is the overall structure diagram of the combined fire-stop breathing valve of the utility model;

[0026] Figure 2 This is an exploded view of the utility model combined fire-stop breathing valve;

[0027] Figure 3 It is a partial cutaway view of the housing of the utility model;

[0028] Figure 4 This is a partial cutaway view of the valve core of the utility model;

[0029] Figure 5 This is a schematic diagram of the overall structure of the valve core of the utility model;

[0030] Figure 6 This is an internal cross-sectional view of the combined fire-stop breathing valve of the utility model;

[0031] Figure 7 It is an axonometric view of the pressure end assembly of the utility model;

[0032] Figure 8 This is an axonometric view of the pressure end assembly of the present invention from another perspective;

[0033] Figure 9 This is a schematic diagram of the connection between the pressure end valve seat and the pressure end valve stem of the utility model. Figure 1 ;

[0034] Figure 10 This is a schematic diagram of the connection between the pressure end valve seat and the pressure end valve stem of the utility model. Figure 2 ;

[0035] Figure 11 It is an axonometric view of the vacuum end assembly of the utility model;

[0036] Figure 12 This is an axonometric view of the vacuum end assembly of the present invention from another perspective;

[0037] Figure 13 It is an axonometric drawing of the valve cover of the utility model;

[0038] Figure 14 This is an axonometric drawing of the valve cover of the utility model from another perspective;

[0039] Figure 15 It is a structural diagram of the base of the utility model;

[0040] Figure 16 This is a schematic diagram of the normal working state of the combined fire-stop breathing valve according to the embodiment of the utility model;

[0041] Figure 17 This is a schematic diagram of the opening of the pressure end of the combined fire-stop breathing valve according to an embodiment of the utility model;

[0042] Figure 18 It is a schematic diagram of the vacuum end opening of the combined fire-stop breathing valve according to an embodiment of the present utility model.

[0043] In the figure: 1. first bolt; 2. valve cover; 3. limit valve stem; 4. second counterweight plate; 5. vacuum end valve disc; 6. second diaphragm; 7. first nut; 8. vacuum end valve seat; 9. guide sleeve; 10. pressure end valve stem; 11. first counterweight plate; 12. pressure end valve disc; 13. first diaphragm; 14. second nut; 15. pressure end valve seat; 16. third nut; 17. housing; 18. second bolt; 19. hexagonal screw plug; 20. gasket; 21. fire arrester; 22. base; 23. outer wall; 24. valve core; 25. first ring body; 26. second ring body; 27. first window; 28. second window; 29. ​​connecting rib; 30. ring seat; 31. connecting rod; 32. first screw hole; 33. rod cap; 34. second screw hole; 36. pressure end assembly; 37. vacuum end assembly. DETAILED DESCRIPTION

[0044] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0045] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0046] like Figures 1-18 As shown, a combined fire-stop breathing valve includes a shell 17, in which a pressure end assembly 36 and a vacuum end assembly 37 are provided. The vacuum end assembly 37 is located above the pressure end assembly 36. The top end of the shell 17 is connected to the valve cover 2, and the vacuum end assembly 37 is connected to the valve cover 2 through a limiting valve stem 3. The bottom end of the shell 17 is connected to the base 22.

[0047] The combined fire-retardant pressure vacuum relief valve of the utility model can make the pressure relief at the pressure end and the vacuum relief at the vacuum end pass through two different channels respectively. The independent flow channel design eliminates the flow dead angle problem of the composite flow channel and avoids the generation of disturbance and turbulence in the valve.

[0048] Further, such as Figure 3 、 Figure 4 and Figure 5 As shown, for ease of understanding and observation, Figure 3 and Figure 4 It is a structural diagram after cutting off one-quarter of the structure. The shell 17 includes an outer wall 23, and a valve core 24 is provided in the outer wall 23. The valve core 24 includes a first ring body 25 and a second ring body 26. The first ring body 25 is located above the second ring body 26. The first ring body 25 and the second ring body 26 are coaxial and connected. The inner diameter of the first ring body 25 is larger than the inner diameter of the second ring body 26. A plurality of first windows 27 are provided on the side of the first ring body 25, and a plurality of second windows 28 are provided on the side of the second ring body 26.

[0049] Further, such as Figure 5 and Figure 6 As shown, the vacuum end assembly 37 is provided at the upper end opening of the first ring body 25 , and the pressure end assembly 36 is provided at the upper end opening of the second ring body 26 . The first ring body 25 and the second ring body 26 are connected to the inner surface of the outer wall 23 through the connecting rib 29 .

[0050] Further, such as Figure 7 and Figure 8 As shown, the pressure end assembly 36 includes a pressure end valve seat 15, a pressure end valve disc 12 and a pressure end valve stem 10. The pressure end valve disc 12 covers the pressure end valve seat 15. A first diaphragm 13 is provided between the pressure end valve disc 12 and the pressure end valve seat 15. A first counterweight plate 11 is provided above the pressure end valve disc 12. The pressure end valve stem 10 passes through the first counterweight plate 11, the pressure end valve disc 12, the first diaphragm 13 and is fixedly connected to the pressure end valve seat 15.

[0051] Further, such as Figure 9 and Figure 10 As shown, the pressure end valve seat 15 includes a ring seat 30 and a connecting rod 31. The connecting rod 31 is connected to the ring seat 30 and is arranged at the center of the ring seat 30. A through hole is provided on the connecting rod 31. One end of the pressure end valve stem 10 is connected to the third nut 16 through the through hole. A guide sleeve 9 is provided on the outer surface of the pressure end valve stem 10. The end of the guide sleeve 9 close to the pressure end valve seat 15 is connected to the second nut 14. The first diaphragm 13 is located above the second nut 14.

[0052] Further, such as Figure 11 and Figure 12 As shown, the vacuum end assembly 37 includes a vacuum end valve seat 8, a vacuum end valve disc 5 and a limit valve stem 3. The vacuum end valve disc 5 covers the vacuum end valve seat 8. A second diaphragm 6 is provided between the vacuum end valve disc 5 and the vacuum end valve seat 8. A second counterweight plate 4 is provided above the vacuum end valve disc 5. The limit valve stem 3 passes through the second counterweight plate 4, the vacuum end valve disc 5, and the second diaphragm 6 and is connected to a first nut 7.

[0053] Further, such as Figure 13 and Figure 14 As shown, a plurality of first screw holes 32 are provided at the edge of the valve cover 2, and the valve cover 2 is connected to the top of the shell 17 through a plurality of first bolts 1. A rod cap 33 is provided at the center of the valve cover 2, and the end of the limiting valve stem 3 away from the second counterweight plate 4 extends into the rod cap 33.

[0054] Further, such as Figure 15 As shown, a plurality of second screw holes 34 are provided at the edge of the base 22, and the base 22 is connected to the bottom end of the shell 17 through a plurality of second bolts 18. A fire-blocking element 21 is provided between the base 22 and the shell 17, and a gasket 20 is provided at the center of the upper surface of the fire-blocking element 21. The fire-blocking element 21 is specifically a stainless steel fire-blocking core.

[0055] Furthermore, reserved interfaces are provided on both sides of the housing 17 , and the reserved interfaces are opposite to the first window 27 , and the reserved interfaces are connected with hexagonal screw plugs 19 .

[0056] Furthermore, the outer wall 23 and the valve core 24 are integrated.

[0057] Furthermore, the vacuum end valve disc 5 and the pressure end valve disc 12 adopt a 90° downward skirt design.

[0058] On the one hand, the connecting ribs connect the first ring body, the second ring body and the outer wall. On the other hand, a space channel is formed between the outer surface of the first ring body, the outer surface of the second ring body, the inner surface of the outer wall and the connecting ribs for gas flow.

[0059] When the breathing valve is assembled, the interior of the first ring body is connected to the space channel formed between the outer wall, the outer surface of the first ring body, and the connecting ribs through the first window; the interior of the second ring body is connected to the space channel formed between the outer wall, the outer surface of the second ring body, and the connecting ribs through the second window.

[0060] The utility model is a combined fire-stop breathing valve, such as Figure 2 As shown, it includes a pressure end valve seat 15 and a vacuum end valve seat 8. There is a valve stem limiting device at the bottom of the pressure end valve seat 15. The pressure end valve stem 10 and the pressure end valve seat 15 are fixed together with a third nut 16, which effectively fixes the take-off path of the valve plate and avoids the valve plate from not being able to reset according to the predetermined trajectory after taking off. The top of the pressure end valve seat 15 is the positive pressure end. The positive pressure end includes a first counterweight plate 11 and a pressure end valve disc 12. The bottom of the pressure end valve disc 12 is designed with an embedded groove. The first counterweight plate 11 is pressed on the surface of the pressure end valve disc 12, so that the pressure end valve An effective seal is formed between the disc 12 and the pressure end valve seat 15. The outer part of the pressure end valve stem 10 is covered with a guide sleeve 9. The bottom of the guide sleeve 9 is provided with a thread. The guide sleeve 9 is fixed to the positive pressure end with a second nut 14. The top of the vacuum end valve seat 8 is the negative pressure end. The negative pressure end includes a second counterweight plate 4 and a vacuum end valve disc 5. The bottom of the vacuum end valve disc 5 is designed with an embedded groove. The second counterweight plate 4 is pressed on the surface of the vacuum end valve disc 5, so that an effective seal is formed between the vacuum end valve disc 5 and the vacuum end valve seat 8. The negative pressure end is fixed by the limit valve stem 3 and the first nut 7.

[0061] Furthermore, sealing diaphragms are fixed to the bottom ends of the pressure-end valve disc 12 and the vacuum-end valve disc 5 , which can form an effective seal with the pressure-end valve seat 15 and the vacuum-end valve seat 8 .

[0062] Furthermore, there are reserved interfaces on both sides of the shell 17 to facilitate the connection of instruments during maintenance and measurement. Under normal conditions, they are blocked with hexagonal screw plugs 19. A valve cover 2 is provided at the upper end of the shell 17, and a plurality of first bolts 1 are commonly connected between the shell 17 and the valve cover 2, which is conducive to the installation and disassembly of the valve cover 2. A base 22 is provided at the lower end of the shell 17, and a plurality of second bolts 18 are commonly connected between the shell 17 and the base 22, which is conducive to the installation and disassembly of the shell 17 and facilitates the maintenance and maintenance of the internal sealing components and the fire-blocking element 21.

[0063] Furthermore, the upper portion of the base 22 is in a grille style, which can effectively intake and exhaust air, and a fire-blocking element 21 is embedded inside. A gasket 20 is provided at the upper end of the base 22 to form an effective seal at the connection between it and the shell 17.

[0064] In one embodiment, Figure 16 As shown, arrows indicate the direction of gas flow. Under normal conditions, internal and external air pressures remain balanced. The pressure-side valve disc 12, under the action of the first counterweight plate 11, blocks the pressure-side valve seat 15, achieving a positive seal and blocking the flow path on the pressure side. Simultaneously, internal air pressure exerts downward pressure on the vacuum-side valve disc, forcing the vacuum-side valve disc 5 and valve seat 8 to achieve a reverse compression seal, blocking the flow path on the vacuum side and ensuring a good seal at both locations.

[0065] In one embodiment, Figure 17 As shown in the figure, the arrows indicate the direction of gas flow. Pressure end opening: When the tank is transported into the storage tank due to operation, the material compresses the steam space inside the storage tank. When the set pressure is reached, the opening action of the combined fire-stop breathing valve is as follows: the pressure in the tank pushes the pressure end of the combined fire-stop breathing valve to open, and the guide sleeve 9, the first counterweight plate 11 and the pressure end valve disc 12 are lifted together. When the pressure drops to 90% of the set pressure, the valve plate assembly (first counterweight plate 11, pressure end valve disc 12) is re-sealed with the pressure end valve seat 15. The pressure end valve stem 10 is fixed on the pressure end valve seat 15 to prevent the valve plate assembly (first counterweight plate 11, pressure end valve disc 12) from being unable to reset according to the predetermined trajectory.

[0066] The combined fire-stop breathing valve adopts 10% overpressure valve disc technology. Its unique 90° downward skirt design helps the opening height of the pressure end valve plate assembly to reach 1 / 4 of the flow channel diameter, which is the so-called maximum opening value, after an overpressure of 10%.

[0067] In one embodiment, Figure 18 As shown, the vacuum end is open: when the storage tank transfers materials outward due to operation, the outflow of materials will cause the inside of the storage tank to be vacuumed. When the set vacuum value is reached, the opening action of the combined fire-stop breathing valve is as follows: the external atmospheric pressure pushes the vacuum end of the combined fire-stop breathing valve to open, and the second counterweight and the vacuum end valve disc 5 move upward, and the vacuum end of the valve opens. When the vacuum pressure rises to 90% of the set vacuum, the valve plate assembly (the second counterweight plate 4, the vacuum end valve disc 5) cooperates with the vacuum end valve seat 8 to seal again. The combined fire-stop breathing valve is designed with a flame arrester to provide a fire-stop function while providing pressure and vacuum relief. The first fire-stop element 21 adopts a longitudinal design, which effectively prevents the generation of back pressure in the breathing valve due to the horizontal design due to the inlet and outlet air duct on the side facing away from the first fire-stop element 21.

[0068] When the utility model is in use, the combined fire-stop breathing valve and the independent flow channel design eliminate the problem of dead angle of flow in the composite flow channel; the combined design enables one safety device to realize fire-stopping, pressure relief and vacuum relief; the independent inlet and outlet air channels avoid the back pressure risk caused by the side inlet and outlet air channels; the functions of fire-stopping, pressure relief and vacuum relief are realized at the same time, and the innovative combined design solves two safety protections with one device, thereby reducing the total mass of the safety equipment; the innovative integrated flame arrester structure design can realize short return seat pressure difference; before pressure relief, the valve seat has excellent sealing performance; after pressure relief, the valve seat has excellent sealing performance; and excellent chemical compatibility.

[0069] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0070] Those skilled in the art will readily understand that the present invention encompasses any combination of the components described in the above specification and the detailed description, as well as the components shown in the accompanying drawings. Due to space limitations and to maintain clarity, not all of the various solutions resulting from these combinations are described. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0071] Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and should not be construed as limiting the present invention. Those skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined fire-stop breathing valve, characterized in that: It includes a shell, in which a pressure end assembly and a vacuum end assembly are provided. The vacuum end assembly is located above the pressure end assembly. The top end of the shell is connected to a valve cover, and the vacuum end assembly is connected to the valve cover through a limiting valve stem. The bottom end of the shell is connected to a base.

2. A combined fire-stop breathing valve according to claim 1, characterized in that: The shell includes an outer wall, a valve core is provided in the outer wall, the valve core includes a first ring body and a second ring body, the first ring body is located above the second ring body, the first ring body and the second ring body are coaxial and connected, the inner diameter of the first ring body is larger than the inner diameter of the second ring body, a plurality of first windows are provided on the side of the first ring body, and a plurality of second windows are provided on the side of the second ring body.

3. A combined fire-stop breathing valve according to claim 2, characterized in that: The vacuum end assembly is arranged at the upper end opening of the first ring body, and the pressure end assembly is arranged at the upper end opening of the second ring body. The first ring body and the second ring body are connected to the inner surface of the outer wall through connecting ribs.

4. A combined fire-stop breathing valve according to claim 1, characterized in that: The pressure end assembly includes a pressure end valve seat, a pressure end valve disc and a pressure end valve stem. The pressure end valve disc cover is on the pressure end valve seat. A first diaphragm is provided between the pressure end valve disc and the pressure end valve seat. A first counterweight plate is provided above the pressure end valve disc. The pressure end valve stem passes through the first counterweight plate, the pressure end valve disc, the first diaphragm and is fixedly connected to the pressure end valve seat.

5. A combined fire-stop breathing valve according to claim 4, characterized in that: The pressure end valve seat includes a ring seat and a connecting rod, the connecting rod is connected to the ring seat, the connecting rod is arranged at the center of the ring seat, a through hole is provided on the connecting rod, one end of the pressure end valve stem is connected to a third nut through the through hole, a guide sleeve is provided on the outer surface of the pressure end valve stem, the end of the guide sleeve close to the pressure end valve seat is connected to a second nut, and the first diaphragm is located above the second nut.

6. A combined fire-stop breathing valve according to claim 1, characterized in that: The vacuum end assembly includes a vacuum end valve seat, a vacuum end valve disc and a limit valve stem. The vacuum end valve disc cover is on the vacuum end valve seat. A second diaphragm is provided between the vacuum end valve disc and the vacuum end valve seat. A second counterweight plate is provided above the vacuum end valve disc. The limit valve stem passes through the second counterweight plate, the vacuum end valve disc and the second diaphragm and is connected to a first nut.

7. A combined fire-stop breathing valve according to claim 6, characterized in that: A plurality of first screw holes are provided at the edge of the valve cover, and the valve cover is connected to the top of the shell through a plurality of first bolts. A rod cap is provided at the center of the valve cover, and the end of the limiting valve stem away from the second counterweight plate extends into the rod cap.

8. A combined fire-stop breathing valve according to claim 1, characterized in that: A plurality of second screw holes are provided at the edge of the base, and the base is connected to the bottom end of the shell through a plurality of second bolts. A fire-blocking element is provided between the base and the shell, and a gasket is provided at the center of the upper surface of the fire-blocking element. The fire-blocking element is specifically a stainless steel fire-blocking core.

9. A combined fire-stop breathing valve according to claim 2, characterized in that: Reserved interfaces are provided on both sides of the shell, the reserved interfaces are directly opposite to the first window, and the reserved interfaces are connected with hexagonal screw plugs.

10. A combined fire-stop breathing valve according to claim 2, 3 or 9, characterized in that: The outer wall and the valve core are integrated.

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