Soft-seal downward-expanding angle valve with fireproof function

Abstract

The utility model relates to a soft sealing downward-expanding type angle valve with a fireproof function. The check valve comprises a valve body, the valve seat is arranged on the valve body; the valve element assembly comprises a valve rod movably connected into the valve body in the axial direction and a valve element connected with the valve rod and matched with the valve seat in a sealed mode. Wherein the valve core comprises a valve core sealing surface, the valve seat comprises a valve seat sealing surface, the valve seat sealing surface is arranged opposite to the valve core sealing surface, and a preset gap is reserved between the valve seat sealing surface and the valve core sealing surface; the sealing ring is mounted on the valve element, the sealing ring comprises a sealing ring sealing surface, and the sealing ring sealing surface can be in sealing contact with the valve seat sealing surface; and when the sealing ring is damaged by high temperature, the valve element sealing surface can be in sealing contact with the valve seat sealing surface. The sealing requirements of soft sealing and hard sealing are met at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid control valve technical field especially is a kind of soft sealing lower expansion type angle valve with fireproof function. BACKGROUND

[0002] The angle valve is a device for discharging, which is mainly used for discharging, sampling and dead-zone-free shut-off operation at the bottom of a reactor, a storage tank and other containers.

[0003] Vinyl acetate-ethylene copolymer emulsion (VAE for short) is a kind of high molecular compound obtained by polymerization of vinyl acetate and ethylene as main raw materials and other auxiliary materials, wherein the content of vinyl acetate is 70% to 95%, and the whole is milky white, has good water resistance, weather resistance and chemical corrosion resistance, and is widely used in adhesive base material, coating base material, paper processing, cement modifier and manufacturing of furniture and appliances. Its main production process is semi-continuous emulsion polymerization, and monomers, initiators, emulsifiers, dispersion media and the like are added into a reaction kettle to polymerize after reaching a certain conversion rate.

[0004] The angle valve is widely used in VAE production device, and is mainly used for controlling product discharge procedure. Since VAE emulsion is flammable and explosive, when contacting open flame, high heat and oxidizing agent, fire or explosion may be caused. In actual production site, the bottom of storage tank is close to ground, and the valve installation space is limited, so that the valve and the pipeline interface are required to be installed in flat connection. However, the hard sealing of the traditional lower expansion type angle valve cannot meet the requirements of higher sealing performance and fireproofing, and the valve seat cannot be inserted into the tank for installation. SUMMARY

[0005] Therefore, the utility model wants to solve the technical problem in prior art, that is, to overcome the problem that the sealing performance and fireproofing of the traditional lower expansion type angle valve cannot be met simultaneously under the condition of meeting the production process requirements, and the valve seat cannot be inserted into the storage tank for installation due to the limitation of installation space.

[0006] To solve the above technical problems, the utility model provides a kind of soft sealing lower expansion type angle valve with fireproof function, comprising:

[0007] Valve body;

[0008] Valve seat, installed in the valve body;

[0009] Valve core assembly, including valve stem being movably connected in the valve body along the axial direction, and valve core being connected with the valve stem and being sealed with the valve seat;Wherein, the valve core includes valve core sealing surface, and the valve seat includes valve seat sealing surface being oppositely arranged with the valve core sealing surface and leaving predetermined gap;

[0010] A sealing ring is mounted on the spool, and the sealing ring comprises a sealing ring sealing surface capable of being in sealing contact with the valve seat sealing surface; wherein the spool sealing surface is capable of being in sealing contact with the valve seat sealing surface when the sealing ring is damaged.

[0011] In an embodiment of the utility model, still include the pressure ring, the sealing ring is pressed on the spool through the pressure ring.

[0012] In an embodiment of the utility model, the outer circle of the spool is provided with a first step and a second step which are connected to each other, the sealing ring is embedded in the first step, and the pressure ring is threadedly connected to the side surface of the second step and abuts against the sealing ring; a sealing ring upper boss and a sealing ring lower boss are respectively arranged at the axial two ends of the sealing ring, a first matching groove is arranged on the spool corresponding to the sealing ring lower boss, and a second matching groove is arranged on the pressure ring corresponding to the sealing ring upper boss.

[0013] In an embodiment of the utility model, the spool sealing surface and the valve seat sealing surface can be in conical surface sealing cooperation, the sealing ring sealing surface and the valve seat sealing surface are in conical surface sealing cooperation, the taper angle of the spool sealing surface is equal to the taper angle of the sealing ring sealing surface, and the sum of the projection widths of the sealing ring sealing surface and the spool sealing surface on the valve seat sealing surface is less than the width of the valve seat sealing surface.

[0014] In an embodiment of the utility model, the material of the sealing ring comprises polytetrafluoroethylene or reinforced polytetrafluoroethylene; the spool sealing conical surface is cladded with hard alloy; and the mutual contact part of the valve seat sealing conical surface and the spool sealing conical surface is cladded with hard alloy.

[0015] In an embodiment of the utility model, the spool is provided with a mounting hole, and the valve rod is provided with a connecting part which extends into the mounting hole and is hingedly matched with the mounting hole.

[0016] In an embodiment of the utility model, a thrust nut is threadedly connected in the mounting hole, the connecting part comprises a connecting head which extends axially on the valve rod and part of the side surface of the valve rod, and the connecting head is limited by the thrust nut;

[0017] The top surface of the connecting head which is in contact with the bottom wall of the mounting hole is a circular arc surface, the side surface of the connecting head is configured as a first valve rod matching surface which is in clearance fit with the side wall of the mounting hole, and part of the side surface of the valve rod is configured as a second valve rod matching surface which is in clearance fit with the nut inner hole of the thrust nut.

[0018] In an embodiment of the utility model, the side of the connector includes a pair of parallelly arranged connecting tenon surfaces, and the mounting hole is provided with an anti-rotation flat surface suitable for gap cooperation with the connecting tenon surface.

[0019] In an embodiment of the utility model, a winding gasket is arranged between the valve seat and the valve body, and the outer end of the valve seat is provided with a connecting end surface suitable for flat joint connection with the pipe opening, and the connecting end surface adopts a short valve seat.

[0020] In an embodiment of the utility model, the valve body is provided with a packing hole, and a packing pad, a first packing, a guide sleeve, a second packing and a packing gland are sequentially arranged on the outer periphery of the valve rod from top to bottom in the packing hole, the valve rod forms single guide through the guide sleeve, and the valve body is connected with a packing pressing plate pressed on the packing gland through a stud and a locking nut.

[0021] The above technical scheme of the utility model has the following advantages compared with the prior art:

[0022] The soft sealing lower expansion type angle valve with the fireproof function has the following advantages: the valve sealing system adopts a double sealing structure of soft sealing and hard sealing, the soft sealing is formed by the sealing ring and the sealing surface of the valve seat, the valve core and the valve seat sealing surface form hard sealing, the hard sealing surface is located behind the soft sealing surface, when a fire occurs in the whole sealing system, the sealing ring of the soft sealing is damaged by high temperature, the hard sealing can still take effect, the function requirement of fireproof is met, the design of the wide sealing surface of the valve seat can meet the sealing requirements of the soft sealing and the hard sealing, the sealing performance of the hard sealing is not affected by the soft sealing residue after the soft sealing in the sealing system is damaged, the short valve seat design enables the valve to be flatly connected and installed on the equipment pipe opening, and insertion-free installation is realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to make the content of the utility model more easily and clearly understood, the utility model is further described in detail below according to specific embodiments of the utility model and in combination with the drawings.

[0024] Figure 1 It is a structural schematic view of the soft sealing lower expansion type angle valve with the fireproof function.

[0025] Figure 2 It is a structural schematic view of the valve core assembly.

[0026] Figure 3 It is a structural schematic view of the connector of the valve rod.

[0027] Figure 4 It is a structural schematic view of the thrust nut.

[0028] Figure 5 It is a sectional view structural schematic view of the valve core.

[0029] Figure 6 is a schematic view of a top structure of a valve core.

[0030] Figure 7 is a schematic view of a structure of a sealing ring.

[0031] Figure 8 is a schematic view of a structure of a pressing ring.

[0032] Figure 9 is a schematic view of a structure of a valve seat.

[0033] Explanation of the drawing marks in the description:

[0034] A, flow inlet; B, flow outlet; 1, valve core assembly; 1.1, valve rod; 1.1.1, connecting tenon surface; 1.1.2, circular arc surface; 1.1.3, second valve rod matching surface; 1.1.4, first valve rod matching surface; 1.2, thrust nut; 1.2.1, nut inner hole; 1.3, valve core; 1.3.1, valve core sealing surface; 1.3.2, mounting hole; 1.3.3, first matching groove; 1.3.4, anti-rotation flat surface; 1.4, sealing ring; 1.4.1, sealing ring sealing surface; 1.4.2, upper sealing ring boss; 1.4.3, lower sealing ring boss; 1.5, pressing ring; 1.5.1, second matching groove; 2, valve seat; 2.1, valve seat sealing surface; 2.2, connecting end surface; 3, winding gasket; 4, inner hexagonal cylindrical head screw; 5, valve body; 6, packing gasket; 7, first packing; 8, guide sleeve; 9, second packing; 10, packing gland; 11, packing pressing plate; 12, type II full metal hexagonal locking nut; 13, full thread stud. DETAILED DESCRIPTION

[0035] The utility model will be further explained in combination with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0036] In the utility model, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical scheme of the utility model, and is not indicated or implied that the indicated technical features must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as the limitation of the utility model.

[0037] In the utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "exceed" and the like are understood as not including the number; "above", "below", "within" and the like are understood as including the number. In the description of the utility model, if "first" and "second" are described, they are only used for distinguishing technical features for the purpose, and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0038] In the utility model, unless otherwise explicitly limited, the words such as "arrangement", "installation", "connection" should be understood in a broad sense, for example, can be directly connected, can also be indirectly connected through an intermediate medium; can be fixedly connected, can also be detachably connected, can also be integrally formed; can be mechanically connected, can also be electrically connected or capable of intercommunication; can be the communication or interaction relationship between two elements inside. The person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0039] Referring to Figure 1 The utility model discloses a soft sealing lower expansion type angle valve with fireproof function, which comprises:

[0040] A valve body 5 is provided with an inlet A and an outlet B;

[0041] A valve seat 2 is installed at the valve body 5 close to the inlet A;

[0042] A valve core assembly 1 comprises a valve rod 1.1 movably connected to the valve body 5 in the axial direction, and a valve core 1.3 connected with the valve rod 1.1 and sealingly matched with the valve seat 2; wherein the valve core 1.3 comprises a valve core sealing surface 1.3.1, the valve seat 2 comprises a valve seat sealing surface 2.1 oppositely arranged with the valve core sealing surface 1.3.1 and leaving a predetermined gap; the valve core 1.3 can close or open the inlet A under the axial movement of the valve rod 1.1.

[0043] A sealing ring 1.4 is installed on the valve core 1.3, and the sealing ring 1.4 comprises a sealing ring sealing surface 1.4.1, which can be in sealing contact with the valve seat sealing surface 2.1; wherein when the sealing ring 1.4 is damaged by high temperature, the valve core sealing surface 1.3.1 can be in sealing contact with the valve seat sealing surface 2.1.

[0044] Through the above setting, when the valve is closed, the sealing ring 1.4 (soft seal) on the valve core assembly 1 contacts the valve seat sealing surface 2.1, when a fire occurs, the sealing ring 1.4 is destroyed due to high temperature, the valve core sealing surface 1.3.1 (hard seal) directly contacts the valve seat sealing surface 2.1 to form a hard seal, this double sealing design realizes the fireproof function on the basis of ensuring the VI level seal, effectively improves the sealing reliability, and ensures the safety of the process device of the valve.

[0045] In one embodiment, referring to Figure 2 Further comprising a pressing ring 1.5, the sealing ring 1.4 is pressed on the valve core 1.3 by the pressing ring 1.5.

[0046] Please continue to refer to Figure 2 As shown, the outer circle of the valve core 1.3 is provided with a first step and a second step which are connected to each other, the sealing ring 1.4 is fitted in the first step, and the pressing ring 1.5 is threadedly connected to the side surface of the second step and abuts against the sealing ring 1.4.

[0047] After the pressing ring 1.5 is threadedly connected with the valve core 1.3, it is fixed by spot welding to prevent loosening. The above structure design can stably fix the sealing ring 1.4 on the valve core 1.3, and the sealing ring 1.4 can be conveniently replaced when it is damaged.

[0048] Referring to Figures 5 to 8 Further, the sealing ring 1.4 is provided with a sealing ring upper boss 1.4.2 and a sealing ring lower boss 1.4.3 at the two axial ends respectively, the valve core 1.3 is provided with a first matching groove 1.3.3 corresponding to the sealing ring lower boss 1.4.3, and the pressing ring 1.5 is provided with a second matching groove 1.5.1 corresponding to the sealing ring upper boss 1.4.2. Through the above setting, the radial force generated by the first matching groove 1.3.3 and the second matching groove 1.5.1 can greatly reduce the deformation of the sealing ring 1.4 when it is pressed.

[0049] In one embodiment, referring to Figure 2As shown, the valve core sealing surface 1.3.1 and the valve seat sealing surface 2.1 can be sealed by a conical surface, the sealing ring sealing surface 1.4.1 and the valve seat sealing surface 2.1 are sealed by a conical surface, the conical angle of the valve core sealing surface 1.3.1 is equal to the conical angle of the sealing surface of the sealing ring 1.4, and the sum of the projection widths of the sealing ring sealing surface 1.4.1 and the valve core sealing surface 1.3.1 on the valve seat sealing surface 2.1 is less than the width of the valve seat sealing surface 2.1. The valve seat sealing surface 2.1 is designed as a wide sealing surface, which can ensure that the valve seat sealing surface 2.1 meets the sealing requirements of the sealing ring sealing surface 1.4.1 (soft sealing) and the valve core sealing surface 1.3.1 (hard sealing) at the same time, avoid the influence of the residual soft sealing on the sealing performance of the hard sealing after the soft sealing in the sealing system is damaged, and make the sealing more reliable.

[0050] In one embodiment, the material of the sealing ring 1.4 includes polytetrafluoroethylene or reinforced polytetrafluoroethylene. The valve core 1.3 sealing conical surface is hard alloy; the valve seat 2 sealing conical surface and the mutual contact part of the valve core 1.3 sealing conical surface are also hard alloy.

[0051] In one embodiment, the valve core 1.3 is provided with a mounting hole 1.3.2, and the valve stem 1.1 is provided with a connecting part extending into the mounting hole 1.3.2 and hinged with the mounting hole 1.3.2.

[0052] Referring to Figure 3 , Figure 4 , Figure 9 As shown, the mounting hole 1.3.2 is threadedly connected with a thrust nut 1.2, and the thrust nut 1.2 is fixed by spot welding after being threadedly connected with the valve core 1.3 to prevent loosening; the connecting part includes a connecting head extending axially from the valve stem 1.1 and part of the side surface of the valve stem 1.1, and the connecting head is limited by the thrust nut 1.2;

[0053] The top surface of the connecting head in contact with the bottom wall of the mounting hole 1.3.2 is a circular arc surface 1.1.2, the side surface of the connecting head is configured as a first valve stem matching surface 1.1.4 in clearance fit with the side wall of the mounting hole 1.3.2, and part of the side surface of the valve stem 1.1 is configured as a second valve stem matching surface 1.1.3 in clearance fit with the nut inner hole 1.2.1 of the thrust nut 1.2.

[0054] Through the above hinged structure, the valve core 1.3 has a certain activity space in six degrees of freedom, and when the valve is closed, the valve core 1.3 can automatically adjust and find the position of the valve seat sealing surface 2.1 on the valve seat 2, improve the stability of the sealing, and ensure the reliability of the valve sealing.

[0055] Referring to Figure 3 ,Figure 6 As shown, the side surface of the connecting head comprises a pair of parallel connecting tenon surfaces 1.1.1, and the mounting hole 1.3.2 is provided with an anti-rotation flat surface 1.3.4 adapted to gap fit with the connecting tenon surface 1.1.1, so as to limit the axial rotation of the valve core 1.3. Thus, the relative rotation between the valve core 1.3 and the valve stem 1.1 due to the unbalanced flow of the medium is limited, avoiding the friction damage of the valve core 1.3 and the valve stem 1.1.

[0056] Referring to Figure 1 As shown, the valve seat 2 and the valve body 5 are provided with a winding gasket 3, and the outer end of the valve seat 2 is provided with a connecting end surface 2.2 adapted to be directly connected with a pipe opening. The connecting end surface 2.2 of the valve seat 2 is designed as a short valve seat (slightly protruding from the outer end of the valve seat 2) which can be flatly installed with the pipe opening of the equipment, realizing insertion-free installation and ensuring the process requirement of flat installation of the valve with the field-installed pipe opening. In addition, the valve seat 2 is fixed on the valve body 5 by a set of inner hexagonal cylindrical head screws 4, ensuring the integrity of the valve during transportation, installation and operation.

[0057] Referring to Figure 1 As shown, in one embodiment, the valve body 5 is made by casting, and the valve body 5 is provided with a packing hole, and the valve core assembly 1 passes through the packing hole and penetrates through the valve body 5. In the packing hole, a packing pad 6, a first packing 7, a guide sleeve 8, a second packing 9 and a packing gland 10 are sequentially installed from top to bottom around the outer periphery of the valve stem 1.1, and the valve stem 1.1 forms single guide through the guide sleeve 8. The valve body 5 is connected with a packing pressing plate 11 which is pressed on the packing gland 10 through a stud (full-thread stud 13) and a locking nut (Ⅱ full-metal hexagonal locking nut 12).

[0058] The valve stem 1.1 cooperates with the guide sleeve 8 arranged in the packing hole of the valve body 5, limiting the radial movement and rotation of the valve stem 1.1 during operation, and ensuring the stability of the guide of the valve stem 1.1. The guide sleeve 8 in the packing hole is made of a higher grade material than the valve stem 1.1, has higher wear resistance, is beneficial to limit the radial movement and rotation of the valve stem 1.1, and improves the stability of the guide of the valve stem 1.1.

[0059] Referring to Figure 1As shown, the implementation principle of the soft sealing downward expansion type angle valve with fireproof function is: when the valve is opened, the valve core assembly 1 is guided by the guide sleeve 8 and moves downward to separate from the valve seat sealing surface 2.1 and enters the inside of the valve body 5. The medium enters the valve from the inlet A and flows out of the valve from the outlet B. During the time when the valve is opened, the medium flushes the valve core 1.3 to generate an unbalanced force, which causes the valve core 1.3 to have a tendency to rotate relative to the valve rod 1.1. The connection between the connecting tenon surface 1.1.1 and the anti-rotation plane 1.3.4 on the valve core 1.3 limits the large-angle rotation of the valve core 1.3. When the valve is closed, the valve core assembly 1 is guided by the guide sleeve 8 and moves upward. When the sealing ring sealing surface 1.4.1 and the valve seat sealing surface 2.1 form point contact, since the valve core 1.3 and the valve rod 1.1 are connected by hinged connection, the small-range movement of the valve core 1.3 in six degrees of freedom eliminates the position error of the valve core 1.3 in space, and the sealing ring sealing surface 1.4.1 and the valve seat sealing surface 2.1 form face contact to complete soft sealing.

[0060] When a fire occurs, the soft sealing sealing ring 1.4 is damaged by high temperature, a gap is generated between the valve core assembly 1 and the valve seat 2, the valve core assembly 1 is moved to the valve seat 2 by the force transmitted by the valve rod 1.1 of the actuator, when the valve core sealing surface 1.3.1 and the valve seat sealing surface 2.1 form point contact, the small-range movement of the valve core 1.3 in six degrees of freedom eliminates the position error of the valve core 1.3 in space, the valve core sealing surface 1.3.1 and the valve seat sealing surface 2.1 form face contact to complete hard sealing, and the fireproof function is achieved.

[0061] Finally, it should be explained that the above specific embodiments are only used to illustrate the technical scheme of the utility model and not to limit. Although the utility model is described in detail with reference to examples, those skilled in the art should understand that the technical scheme of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical scheme of the utility model, and all should be covered in the claim range of the utility model.

Claims

1. A soft-seal, under-swinging angle valve with fire protection function, characterized in that, The utility model relates to a valve, comprising: a valve body (5); a valve seat (2) mounted on the valve body (5); a valve core assembly (1) comprising a valve stem (1.1) movably connected to the valve body (5) in the axial direction, and a valve core (1.3) connected to the valve stem (1.1) and sealingly matched with the valve seat (2); wherein the valve core (1.3) comprises a valve core sealing surface (1.3.1), and the valve seat (2) comprises a valve seat sealing surface (2.1) oppositely arranged to the valve core sealing surface (1.3.1) with a predetermined gap; a sealing ring (1.4) mounted on the valve core (1.3), wherein the sealing ring (1.4) comprises a sealing ring sealing surface (1.4.1) capable of sealingly contacting the valve seat sealing surface (2.1) when the valve is closed; and wherein the valve core sealing surface (1.3.1) is capable of sealingly contacting the valve seat sealing surface (2.1) when the sealing ring (1.4) is damaged.

2. The soft-seal bottom-hinged angle valve with fireproof function according to claim 1, characterized in that, Further comprising a compression ring (1.5), and the sealing ring (1.4) is compressed on the valve core (1.3) by the compression ring (1.5).

3. The soft-seal bottom-hinged angle valve with fireproof function according to claim 2, characterized in that, The outer circle of the valve core (1.3) is provided with a first step and a second step which are connected to each other, the sealing ring (1.4) is embedded in the first step, and the compression ring (1.5) is threadedly connected to the side surface of the second step and abuts against the sealing ring (1.4); the sealing ring (1.4) is respectively provided with a sealing ring upper boss (1.4.2) and a sealing ring lower boss (1.4.3) at both axial ends thereof, the valve core (1.3) is provided with a first matching groove (1.3.3) corresponding to the sealing ring lower boss (1.4.3), and the compression ring (1.5) is provided with a second matching groove (1.5.1) corresponding to the sealing ring upper boss (1.4.2).

4. The soft-seal bottom-hinged angle valve with fireproof function according to claim 1, characterized in that, The valve core sealing surface (1.3.1) and the valve seat sealing surface (2.1) are capable of being sealingly matched by conical surfaces, the sealing ring sealing surface (1.4.1) and the valve seat sealing surface (2.1) are capable of being sealingly matched by conical surfaces, the taper angle of the valve core sealing surface (1.3.1) is equal to the taper angle of the sealing ring sealing surface (1.4.1), and the sum of the projection widths of the sealing ring sealing surface (1.4.1) and the valve core sealing surface (1.3.1) on the valve seat sealing surface (2.1) is less than the width of the valve seat sealing surface (2.1).

5. The soft-seal bottom-hinged angle valve with fireproof function according to claim 1, characterized in that, The material of the sealing ring (1.4) comprises polytetrafluoroethylene or reinforced polytetrafluoroethylene; the valve core (1.3) sealing conical surface is hard alloy surfacing; and the valve seat (2) sealing conical surface and the valve core (1.3) sealing conical surface mutually contacting part are hard alloy surfacing.

6. The soft-seal bottom-lifting angle valve with fireproof function according to claim 1, characterized in that, The valve core (1.3) is provided with a mounting hole (1.3.2), and the valve stem (1.1) is provided with a connecting part extending into the mounting hole (1.3.2) and hingedly matched with the mounting hole (1.3.2).

7. The soft-seal bottom-lifting angle valve with fireproof function according to claim 6, characterized in that, The mounting hole (1.3.2) is threadedly connected with a thrust nut (1.2), the connecting part includes a connecting head axially extending from the valve stem (1.1) and a part of the side surface of the valve stem (1.1), the connecting head is limited by the thrust nut (1.2); The top surface of the connecting head in contact with the bottom wall of the mounting hole (1.3.2) is a circular arc surface (1.1.2), the side surface of the connecting head is configured as a first valve stem matching surface (1.1.4) in clearance fit with the side wall of the mounting hole (1.3.2), and a part of the side surface of the valve stem (1.1) is configured as a second valve stem matching surface (1.1.3) in clearance fit with the nut inner hole (1.2.1) of the thrust nut (1.2).

8. The soft-seal bottom-hinged angle valve with fireproof function according to claim 7, characterized in that, The side surface of the connecting head includes a pair of parallel connecting tenon surfaces (1.1.1), the mounting hole (1.3.2) is provided with an anti-rotation flat surface (1.3.4) adapted to clearance fit with the connecting tenon surface (1.1.1). The valve seat (2) and the valve body (5) are provided with a winding gasket (3), the outer end of the valve seat (2) is provided with a connecting end surface (2.2) adapted to be connected in flush with a pipe opening, and the connecting end surface (2.2) adopts a short valve seat.

9. The soft-seal bottom-hinged angle valve with fireproof function according to claim 1, characterized in that, The valve body (5) is provided with a packing hole, in which a packing pad (6), a first packing (7), a guide sleeve (8), a second packing (9) and a packing gland (10) are sequentially arranged from top to bottom around the valve stem (1.1), the valve stem (1.1) is single-guided by the guide sleeve (8), and the valve body (5) is connected with a packing pressing plate (11) pressing the packing gland (10) by a stud and a locking nut.

10. The soft-seal bottom-lifting angle valve with fireproof function according to claim 1, characterized in that, ​

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