CN113944869A - Low temperature low pressure valve sealing device - Google Patents

Abstract

The invention provides a low-temperature and low-pressure valve sealing device which comprises a low-temperature valve, wherein a liquid inlet end and a liquid outlet end of the low-temperature valve are both connected with a liquid outlet pipe through flanges, a sealing housing is sleeved outside the low-temperature valve, a sealing assembly is arranged inside the sealing housing, and telescopic assemblies are inserted into both ends of the sealing housing; the sealing cover shell comprises a first sealing shell and a second sealing shell, wherein the first sealing shell is sleeved at one end of the low-temperature valve, the second sealing shell is sleeved at the other end of the low-temperature valve, the first sealing shell is fixedly connected with the second sealing shell, and a first sealing packing is fixed on one side surface, close to each other, of the first sealing shell and the second sealing shell. The invention can seal the low-temperature valve, and the steam drainage generated by leakage can be discharged to a trench through the designated discharge port connecting pipe, so that the unit can normally run to the maintenance period on the premise of no personal safety.

Description

Low temperature low pressure valve sealing device

Technical Field

The invention mainly relates to the technical field of valves, in particular to a low-temperature and low-pressure valve sealing device.

Background

The low-temperature valve is a valve with medium temperature of-40 ℃ to-196 ℃, and a power plant valve, and is mainly suitable for pipelines of various systems of a power plant to cut off or connect pipeline media.

According to a low-temperature valve provided by patent document with application number CN201721021965.4, the valve comprises a valve body, a valve cover, a valve seat, a ball body, a valve rod and a hand wheel, wherein the valve rod is connected with the ball body, a gap exists between the valve rod and the valve cover to form a neck cavity, the hand wheel is arranged at the top end of the valve rod, the low-temperature valve further comprises a packing seat, a sealing packing component and a pressing sleeve, the packing seat is arranged at the top end of the valve cover and sleeved outside the valve rod, the sealing packing component and the pressing sleeve are arranged in the packing seat, and the pressing sleeve is positioned above the sealing packing component and connected with the sealing packing component; a pressing device is arranged above the pressing sleeve; the lower part of the valve cover is provided with a pressure relief hole for communicating the neck cavity with the valve middle cavity. The low-temperature valve provided by the valve has the advantages that the overpressure phenomenon cannot occur in the cavity with the lengthened valve cover, the sealing element cannot be loosened and leaked during low-temperature shrinkage, and the use is safe and reliable.

Although the sealing device has no overpressure phenomenon and is safe and reliable to use, the valve often has an external leakage phenomenon, and because the system cannot be isolated, if the valve is processed, the furnace can be stopped and the machine can be stopped, and if the valve is not processed, the leaked steam has certain potential safety hazard. For the leakage of the low-temperature low-pressure primary valve, the cost is too high if the valve is shut down and shut down for treatment.

Disclosure of Invention

The invention mainly provides a low-temperature and low-pressure valve sealing device for solving the technical problems in the background technology.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a low-temperature low-pressure valve sealing device comprises a low-temperature valve, wherein a liquid inlet end and a liquid outlet end of the low-temperature valve are both connected with a liquid outlet pipe through flanges, a sealing housing is sleeved outside the low-temperature valve, a sealing assembly is arranged inside the sealing housing, and telescopic assemblies are inserted into both ends of the sealing housing;

the sealing cover shell comprises a first sealing shell sleeved at one end of the low-temperature valve and a second sealing shell sleeved at the other end of the low-temperature valve, the first sealing shell and the second sealing shell are fixedly connected, and first sealing packing is fixed on the surfaces of the first sealing shell and the second sealing shell, which are close to each other;

the sealing assembly comprises a first sealing mechanism arranged inside the sealing housing and sleeved outside the low-temperature valve, and a second sealing mechanism arranged at the bottom end of the first sealing mechanism and connected with the execution end of the telescopic assembly, wherein the first sealing mechanism comprises a sliding sealing ring arranged outside the flange and connected with the execution end of the telescopic assembly, and a second sealing packing arranged on the inner ring surface of the sliding sealing ring.

Furthermore, the telescopic assembly comprises a telescopic motor fixed at one end, far away from each other, of the first sealing shell and the second sealing shell, a first telescopic mechanism connected with the driving end of the first sealing mechanism, and a second telescopic mechanism connected with the driving end of the second sealing mechanism, and the second telescopic mechanism drives the second sealing mechanism to block a gap between the bottom of the first sealing shell and the bottom of the second sealing shell.

Further, first telescopic machanism is including being fixed in flexible motor extends to the first articulated seat of the inside one end both sides surface of sealed housing, through the pivot with the first articulated seat is kept away from the first one end of the telescopic link of flexible motor and is rotated the first connecting rod of connecting, and through the pivot with the first connecting rod is kept away from the articulated seat of the second that flexible motor telescopic link one end was rotated the connection, the articulated seat of second is fixed in the surface of slip sealing ring, and first connecting rod promotes the slip sealing ring for the slip sealing ring slides on the surface of flange, seals up through the clearance of slip sealing ring between two adjacent flanges.

Further, the second telescopic machanism including be fixed in the telescopic link of flexible motor extends to the third articulated seat of the inside one end lower surface of sealed housing, through the pivot with the second connecting rod that the third articulated seat rotated the connection, and with the fourth articulated seat that the one end rotation of third articulated seat was connected is kept away from to the second connecting rod, the lower fixed surface of fourth articulated seat has the profile of tooth sealer, two the profile of tooth sealer sets up in that interlocks each other, promotes the profile of tooth sealer and slides on the bottom inner wall of sealed housing to make two profile of tooth sealers of interlocking mesh each other, and carry out the shutoff by the clearance that first sealed shell formed with the second sealed shell in the sealed housing.

Furthermore, the tooth-shaped sealer comprises a translation rod fixed on the lower surface of the fourth hinged seat and a plurality of movable sealing blocks fixed on one side surface of the translation rod, which is close to each other, in sequence, and the movable sealing blocks are inserted into gaps between the movable sealing blocks on the other translation rod, so that the movable sealing blocks on the two translation rods are mutually filled.

Furthermore, the tooth-shaped sealer further comprises static sealing blocks which are respectively fixed on the inner wall surfaces of the bottom ends of the first sealing shell and the second sealing shell, and gaps which cannot be sealed and blocked by the tooth-shaped sealer are filled through the static sealing blocks.

Furthermore, a humidity sensor is fixed inside the second sealing shell, and humidity information inside the second sealing shell and the first sealing shell is detected through the humidity sensor.

Further, the both ends surface of first seal shell, second seal shell is fixed with two engaging lugs from top to bottom, with one side two be fixed with the anti-overflow pipe between the engaging lug, the internal surface of anti-overflow pipe is fixed with the sealed packing of third, through the sealed packing of third between two engaging lugs to reduce the clearance between first seal shell after the connection, the second seal shell.

Furthermore, a liquid outlet assembly is arranged at the bottom end of the sealing cover casing, the liquid outlet assembly comprises liquid discharge pipes arranged on the shells at the bottom ends of the first sealing shell and the second sealing shell in a penetrating mode, and sealing mechanisms arranged at the top ends of the liquid discharge pipes, and the openings at the top ends of the liquid discharge pipes are sealed through the sealing mechanisms so as to prevent elements inside the sealing cover casing from being influenced by the external environment.

Furthermore, sealing mechanism include with fluid-discharge tube upper surface looks butt's floater, and through the pivot with the fifth articulated seat that the floater rotates to be connected, two the fifth articulated seat is fixed in respectively on the bottom inner wall of first sealed shell, second sealed shell, when storing up too much liquid in sealed housing bottom, discharges through the fluid-discharge tube, because the fluid-discharge tube is linked together through hose and discharge site for the hydrops is discharged.

Compared with the prior art, the invention has the beneficial effects that:

firstly, the low-temperature valve can be sealed through the first sealing mechanism, and steam drainage generated by leakage can be discharged to a trench through a designated discharge port connecting pipe, so that the unit normally operates to the maintenance period on the premise of no personal safety, and then the valve maintenance is carried out, thereby avoiding personal safety and equipment safety caused by steam leakage on site.

Secondly, the invention can seal the low-temperature valve through the first sealing mechanism, and seal the gap of the sealing cover casing through the second sealing mechanism, thereby sealing the low temperature through various sealing modes and guiding the drainage of steam to discharge so that the drainage of steam can be accurately discharged into a designated discharge port.

The present invention will be explained in detail below with reference to the drawings and specific embodiments.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is a schematic view of the internal structure of the sealed housing of the present invention;

FIG. 6 is an exploded view of the present invention;

FIG. 7 is a schematic view of the telescoping assembly of the present invention;

fig. 8 is an enlarged view of the structure of region a in fig. 6.

In the figure: 10. a low temperature valve; 20. a liquid outlet pipe; 30. sealing the housing; 31. a first sealed case; 32. a second sealed housing; 33. a first seal packing; 34. connecting lugs; 35. a third seal packing; 36. an anti-overflow pipe; 40. a seal assembly; 41. a first sealing mechanism; 411. a sliding seal ring; 412. a second seal packing; 42. a second sealing mechanism; 50. a telescoping assembly; 51. a first telescoping mechanism; 511. a first hinge mount; 512. a first link; 513. a second hinge mount; 52. a second telescoping mechanism; 521. a third hinge mount; 522. a second link; 523. a fourth hinge base; 524. a tooth sealer; 5241. a translation rod; 5242. a dynamic sealing block; 5243. a static seal block; 53. a telescopic motor; 60. a liquid outlet assembly; 61. a liquid discharge pipe; 62. a sealing mechanism; 621. a floating ball; 622. and a fifth hinge base.

Detailed Description

In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in different forms and not limited to the embodiments described herein, but which are provided so as to provide a more thorough and complete disclosure of the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the knowledge of the terms used herein in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In an embodiment, referring to fig. 1 to 8, a low-temperature and low-pressure valve sealing device includes a low-temperature valve 10, a liquid inlet end and a liquid outlet end of the low-temperature valve 10 are both connected with a liquid outlet pipe 20 through flanges 11, a sealing housing 30 is sleeved outside the low-temperature valve 10, a sealing assembly 40 is arranged inside the sealing housing 30, and telescopic assemblies 50 are inserted into both ends of the sealing housing 30;

the sealing housing 30 comprises a first sealing shell 31 sleeved at one end of the low-temperature valve 10 and a second sealing shell 32 sleeved at the other end of the low-temperature valve 10, the first sealing shell 31 and the second sealing shell 32 are fixedly connected, and first sealing packing 33 is fixed on the surfaces of the first sealing shell 31 and the second sealing shell 32, which are close to each other;

the sealing assembly 40 is including locating inside the sealed encloser 30, and the cover is located the outside first sealing mechanism 41 of low temperature valve 10, and locate first sealing mechanism 41 bottom, and with the second sealing mechanism 42 that the execution end of flexible subassembly 50 is connected, first sealing mechanism 41 is located including the cover the flange 11 is outside, and with the slip sealing ring 411 that the execution end of flexible subassembly 50 is connected to and locate the second sealing packing 412 on slip sealing ring 411 inner ring surface.

Specifically, please refer to fig. 1, 4, 5 and 6 again, the telescopic assembly 50 includes a telescopic motor 53 fixed at one end of the first sealing housing 31 and the second sealing housing 32 away from each other, a first telescopic mechanism 51 connected to the driving end of the first sealing mechanism 41, and a second telescopic mechanism 52 connected to the driving end of the second sealing mechanism 42, the first telescopic mechanism 51 includes a first hinge seat 511 fixed to the telescopic motor 53 and extending to the two side surfaces of one end of the interior of the sealing housing 30, a first connecting rod 512 rotatably connected to one end of the first hinge seat 511 away from the telescopic motor 53 through a rotating shaft, and a second hinge seat 513 rotatably connected to one end of the first connecting rod 512 away from the telescopic motor 53 through a rotating shaft, the second hinge seat 513 is fixed on the outer surface of the sliding sealing ring 411, the second telescopic mechanism 52 comprises a third hinge base 521 fixed on the telescopic rod of the telescopic motor 53 and extending to the lower surface of one end inside the sealed housing 30, a second connecting rod 522 rotatably connected with the third hinge base 521 through a rotating shaft, and a fourth hinge base 523 rotatably connected with one end of the second connecting rod 522 far away from the third hinge base 521, wherein tooth-shaped sealers 524 are fixed on the lower surface of the fourth hinge base 523, and the two tooth-shaped sealers 524 are arranged in a staggered manner;

in this embodiment, the first telescoping mechanism 51 and the second telescoping mechanism 52 are driven by the telescoping motor 53 to operate, the sliding seal ring 411 is driven by the first telescoping mechanism 51 to slide on the outer surface of the flange 11, and the second sealing mechanism 42 is driven by the second telescoping mechanism 52 to seal the gap between the bottoms of the first seal shell 31 and the second seal shell 32;

further, when the telescopic rod of the telescopic motor 53 pushes the first hinge base 511, since the first connecting rod 512 rotatably connected to the first hinge base 511 is rotatably connected to the second hinge base 513, and the second hinge base 513 is fixed to the outer surface of the sliding sealing ring 411, the first connecting rod 512 pushes the sliding sealing ring 411, so that the sliding sealing ring 411 slides on the outer surface of the flange 11, and the gap between two adjacent flanges is sealed by the sliding sealing ring 411;

further, the third hinge base 521 is driven by the telescopic motor 53 to translate, the second link rod 522 is driven by the third hinge base 521 to translate, and the second link rod 522 is rotatably connected with the fourth hinge base 523 on the tooth-shaped sealer 524 through the rotating shaft, so that the tooth-shaped sealer 524 is pushed to slide on the inner wall of the bottom end of the sealing cover casing 30, two staggered tooth-shaped sealers 524 are meshed with each other, and a gap formed by the first sealing casing 31 and the second sealing casing 32 in the sealing cover casing 30 is sealed.

Specifically, please refer to fig. 6 and 7 again, the tooth-shaped sealer 524 includes a translation rod 5241 fixed on the lower surface of the fourth hinge seat 523, and a plurality of dynamic seal blocks 5242 sequentially fixed on one side surface of the two translation rods 5241 close to each other, the tooth-shaped sealer 524 further includes a static seal block 5243 fixed on the inner wall surfaces of the bottom ends of the first seal housing 31 and the second seal housing 32, respectively, and the humidity sensor 321 is fixed inside the second seal housing 32;

it should be noted that, in this embodiment, when the second link 522 pushes the translation rod 5241 to translate, the movable sealing block 5242 is pushed by the translation rod 5241 to translate, so that the movable sealing block 5242 is inserted into the gap between the movable sealing blocks 5242 on the other translation rod 5241, so that the movable sealing blocks 5242 on the two translation rods 5241 are filled with each other;

further, a gap which cannot be sealed by the tooth-shaped sealer 524 is filled by the static sealing block 5243;

further, the humidity sensor 321 with the type of SETF012 detects the humidity information inside the second sealing shell 32 and the first sealing shell 31, and sends the electrical signal with the humidity information to the inside of the PLC control connected thereto through the communication terminal of the humidity sensor 321, so as to determine whether the humidity inside the sealing enclosure 30 exceeds the set value through the PLC control, thereby determining whether the low temperature valve 10 leaks.

Specifically, please refer to fig. 3 and 7 again, two connecting lugs 34 are fixed on the outer surfaces of the two ends of the first sealing shell 31 and the second sealing shell 32 from top to bottom, an anti-overflow pipe 36 is fixed between the two connecting lugs 34 on the same side, a third sealing packing 37 is fixed on the inner surface of the anti-overflow pipe 36, a liquid outlet assembly 60 is arranged at the bottom end of the sealing cover casing 30, the liquid outlet assembly 60 comprises a liquid outlet pipe 61 penetrating through the bottom end shells of the first sealing shell 31 and the second sealing shell 32, and a sealing mechanism 62 provided at the tip ends of the two liquid discharge pipes 61, the sealing mechanism 62 including a float 621 abutting on the upper surface of the liquid discharge pipe 61, the fifth hinge seats 622 are rotatably connected with the floating ball 621 through a rotating shaft, and the two fifth hinge seats 622 are respectively fixed on the inner walls of the bottom ends of the first sealing shell 31 and the second sealing shell 32;

it should be noted that, in the present embodiment, bolts pass through the connecting lugs 34 to connect the first seal shell 31 and the second seal shell 32 to each other, and the third seal packing 37 between the two connecting lugs 34 is used to reduce the gap between the connected first seal shell 31 and the second seal shell 32;

furthermore, the liquid leaked and accumulated by the low-temperature valve 10 in the sealing cover 30 is discharged through the liquid discharge pipe 61, and the opening at the top end of the liquid discharge pipe 61 is sealed through the sealing mechanism 62, so that the internal elements of the sealing cover 30 are prevented from being influenced by the external environment;

further, when a certain amount of liquid is accumulated at the bottom end of the sealing cover 30, the floating ball 621 is lifted by buoyancy generated by the liquid to rotate the floating ball 621 around the fifth hinge seat 622, so that when an excessive amount of liquid is accumulated at the bottom end of the sealing cover 30, the excessive liquid is discharged through the liquid discharge pipe 61, and the accumulated liquid is discharged because the liquid discharge pipe 61 communicates with a discharge point through a hose.

The specific operation mode of the invention is as follows:

when the low temperature valve 10 works, the humidity sensor 321 with the type SETF012 in the sealing enclosure 30 detects the humidity information in the second sealing enclosure 32 and the first sealing enclosure 31, and sends an electric signal with the humidity information to the interior of a PLC (programmable logic controller) connected with the humidity sensor 321 through a communication end of the humidity sensor 321, so as to judge whether the humidity in the sealing enclosure 30 exceeds a set value through the PLC control, thereby judging whether the low temperature valve 10 leaks, when the low temperature valve 10 leaks and needs emergency treatment, the telescopic rod of the telescopic motor 53 on the sealing enclosure 30 pushes the first hinge seat 511, as the first connecting rod 512 rotatably connected on the first hinge seat 511 is rotatably connected with the second hinge seat 513, the second hinge seat 513 is fixed on the outer surface of the sliding sealing ring 411, so that the first connecting rod 512 pushes the sliding sealing ring 411, and the sliding sealing ring 411 slides on the outer surface of the flange 11, the gap between two adjacent flanges is sealed through the sliding sealing ring 411, and the first sealing packing 33 is arranged on the inner ring surface of the sliding sealing ring 411, so that the gap between the sliding sealing ring 411 and the outer surface of the flange 11 is further reduced, and the sealing effect is improved;

the third hinge base 521 is driven by the telescopic motor 53 to translate, the second connecting rod 522 is driven by the third hinge base 521 to translate, since the second link 522 is rotatably connected to the fourth hinge seat 523 of the tooth-shaped sealer 524 through the rotating shaft, thereby pushing the tooth-shaped sealer 524 to slide on the inner wall of the bottom end of the sealing cover 30, so that the two tooth-shaped sealers 524 which are staggered with each other are engaged with each other, and seals a gap formed by the first sealing shell 31 and the second sealing shell 32 in the sealing cover 30, when a certain amount of liquid is accumulated at the bottom end of the sealing cover 30, the floating ball 621 is lifted by the buoyancy generated by the liquid, so that the floating ball 621 rotates around the fifth hinge seat 622, therefore, when an excessive amount of liquid is accumulated at the bottom end of the sealed cover 30, the excessive liquid is discharged through the liquid discharge pipe 61, and the accumulated liquid is discharged because the liquid discharge pipe 61 is communicated with a discharge point through a hose.

The invention is described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the above-described embodiments, and it is within the scope of the invention to adopt such insubstantial modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.

Claims (10)

1. The low-temperature and low-pressure valve sealing device comprises a low-temperature valve (10) and is characterized in that a liquid inlet end and a liquid outlet end of the low-temperature valve (10) are connected with a liquid outlet pipe (20) through flanges (11), a sealing housing (30) is sleeved outside the low-temperature valve (10), a sealing assembly (40) is arranged inside the sealing housing (30), and telescopic assemblies (50) are inserted into two ends of the sealing housing (30);

the sealing cover shell (30) comprises a first sealing shell (31) sleeved at one end of the low-temperature valve (10) and a second sealing shell (32) sleeved at the other end of the low-temperature valve (10), the first sealing shell (31) and the second sealing shell (32) are fixedly connected, and a first sealing packing (33) is fixed on the surface of one side, close to each other, of the first sealing shell (31) and the second sealing shell (32);

sealing assembly (40) is including locating inside, and the cover of sealed housing (30) is located the outside first sealing mechanism (41) of low temperature valve (10), and locate first sealing mechanism (41) bottom, and with second sealing mechanism (42) that the execution end of flexible subassembly (50) is connected, first sealing mechanism (41) are located including the cover flange (11) outside, and with sliding seal ring (411) that the execution end of flexible subassembly (50) is connected to and locate sliding seal ring (411) inner ring surface's second sealing packing (412).

2. The low-temperature low-pressure valve sealing device according to claim 1, wherein the telescopic assembly (50) comprises a telescopic motor (53) fixed at one end of the first sealing shell (31) and the second sealing shell (32) which are far away from each other, a first telescopic mechanism (51) connected with the driving end of the first sealing mechanism (41), and a second telescopic mechanism (52) connected with the driving end of the second sealing mechanism (42).

3. The sealing device for the low-temperature and low-pressure valve is characterized in that the first telescopic mechanism (51) comprises a first hinged seat (511) fixed on the two side surfaces of one end of the telescopic motor (53) extending to the inside of the sealing housing (30), a first connecting rod (512) rotatably connected with one end of the first hinged seat (511) far away from the telescopic rod of the telescopic motor (53) through a rotating shaft, and a second hinged seat (513) rotatably connected with one end of the first connecting rod (512) far away from the telescopic rod of the telescopic motor (53) through a rotating shaft, wherein the second hinged seat (513) is fixed on the outer surface of the sliding sealing ring (411).

4. The low-temperature low-pressure valve sealing device according to claim 2, wherein the second telescoping mechanism (52) comprises a third hinge base (521) fixed on a telescoping rod of the telescoping motor (53) and extending to a lower surface of one end inside the sealing housing (30), a second connecting rod (522) rotatably connected with the third hinge base (521) through a rotating shaft, and a fourth hinge base (523) rotatably connected with one end, far away from the third hinge base (521), of the second connecting rod (522), a tooth-shaped sealer (524) is fixed on a lower surface of the fourth hinge base (523), and the two tooth-shaped sealers (524) are arranged in a staggered manner.

5. The low-temperature and low-pressure valve sealing device according to claim 4, wherein the tooth-shaped sealer (524) comprises a translation rod (5241) fixed to the lower surface of the fourth hinge seat (523), and a plurality of dynamic sealing blocks (5242) fixed to one side surface of two adjacent translation rods (5241).

6. The low-temperature and low-pressure valve sealing device according to claim 5, wherein the tooth-shaped sealer (524) further comprises static sealing blocks (5243) fixed to the bottom end inner wall surfaces of the first sealing housing (31) and the second sealing housing (32), respectively.

7. The low-temperature and low-pressure valve sealing device as claimed in claim 1, wherein a humidity sensor (321) is fixed inside the second sealing shell (32).

8. The low-temperature and low-pressure valve sealing device according to claim 1, wherein two connecting lugs (34) are fixed on the outer surfaces of the two ends of the first sealing shell (31) and the second sealing shell (32) from top to bottom, an anti-overflow pipe (36) is fixed between the two connecting lugs (34) on the same side, and a third sealing packing (35) is fixed on the inner surface of the anti-overflow pipe (36).

9. The sealing device for the low-temperature and low-pressure valve as claimed in claim 8, wherein a liquid outlet assembly (60) is arranged at the bottom end of the sealing cover housing (30), and the liquid outlet assembly (60) comprises a liquid discharge pipe (61) penetrating through the housing at the bottom ends of the first sealing housing (31) and the second sealing housing (32), and a sealing mechanism (62) arranged at the top ends of the two liquid discharge pipes (61).

10. The sealing device for the low-temperature and low-pressure valve as claimed in claim 9, wherein the sealing mechanism (62) comprises a floating ball (621) abutting against the upper surface of the drain pipe (61), and a fifth hinge seat (622) rotatably connected with the floating ball (621) through a rotating shaft, and the two fifth hinge seats (622) are respectively fixed on the inner walls of the bottom ends of the first sealing shell (31) and the second sealing shell (32).

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