CN115949788A - High-sealing smoke-discharging fire-proof valve - Google Patents
High-sealing smoke-discharging fire-proof valve Download PDFInfo
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- CN115949788A CN115949788A CN202310239557.XA CN202310239557A CN115949788A CN 115949788 A CN115949788 A CN 115949788A CN 202310239557 A CN202310239557 A CN 202310239557A CN 115949788 A CN115949788 A CN 115949788A
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Abstract
The invention relates to the technical field of smoke exhaust valves, in particular to a high-sealing smoke exhaust fireproof valve, which comprises: the top surface of the smoke exhaust valve frame is provided with a driving sliding guide, the valve driving assembly is slidably mounted on the inner side of the driving sliding guide, the valve main body is rotatably mounted on the inner side of the smoke exhaust valve frame, the two sides of the valve main body are respectively provided with a joint end and a butt groove, the joint ends and the butt grooves on the two sides of the adjacent valve main bodies are mutually attached, the surface of the valve main body is provided with a heat insulation coating, and the inner side of the smoke exhaust valve frame is rotatably mounted with a limiting connecting rod. According to the invention, by arranging the novel automatic smoke exhaust valve structure, the valve main body is automatically pushed to perform deflection motion when the indoor smoke generates high pressure excessively, the movable sliding sleeve and the limiting connecting rod move close to each other to realize deflection of the valve main body and compression of the spring sleeve, smoke is rapidly exhausted, the structure is simple, and the stability of the mechanical structure is high.
Description
Technical Field
The invention relates to the technical field of smoke exhaust valves, in particular to a high-sealing smoke exhaust fireproof valve.
Background
A smoke damper is a fire fighting element, usually installed on the pipe of a mechanical smoke exhaust system. It opens when a fire occurs. After a fire occurs indoors, the smoke exhaust fan is started. Simultaneously, the fire prevention valve of discharging fume is opened, discharges fume in the fire control room, the harm of flue gas when avoiding the conflagration to take place. When the fire is too great, the flame enters the smoke evacuation pipe through the exhaust port. When the smoke temperature in the exhaust pipe reaches 280 ℃, the 280-degree fusible rod on the exhaust fire damper is fused, and the exhaust fire damper is closed. Meanwhile, the signal exhaust fan is closed, and the requirements of smoke exhaust and fire resistance integrity are met within a certain time, so that smoke and fire disasters are prevented.
Present sealed smoke exhaust fire prevention valve mainly adopts electronic sensor like smoke transducer, the emergence of the outside condition of a fire of structure perception such as temperature sensor and infrared condition of a fire sensor, thereby the closed diffusion in order to avoid the condition of a fire of control smoke exhaust fire prevention valve, realize the fire prevention effect, through opening of mechanical drive structure control flap in the work of discharging fume, this type of electronic structure, in the in-service use access of required current, thereby the emergence of conflagration has the probability to lead to cutting off of power to make smoke exhaust fire prevention valve lose effect, in addition, general fire prevention valve is formed by welding after Q235 galvanized iron plate passes through the contour machining. During production, besides the problem that the flatness of the formed and processed iron plate is good technically, the problem that thermal deformation is easily generated due to welding processing also exists, so that great processing difficulty is brought to workers for manufacturing products, and the flatness cannot meet the requirement. And the deformation is generated after the heating, and a larger gap is generated between the blade and the valve body after the deformation is generated, so that the air leakage rate of the fire-proof valve cannot reach the standard of the national standard GB 15930-2007.
In view of the above, the present invention provides a high-sealing smoke-discharging fire-proof valve, which is developed and improved to solve the existing problems and to achieve the purpose of solving the problems and improving the practical value through the technology.
Disclosure of Invention
The present invention is directed to solving one of the technical problems of the prior art or the related art.
Therefore, the technical scheme adopted by the invention is as follows: a high-seal smoke evacuation fire damper comprising: the smoke exhaust valve comprises a smoke exhaust valve frame, a valve main body, a valve driving assembly and a thermal expansion door closing assembly, wherein the top surface of the smoke exhaust valve frame is provided with a driving sliding guide, the valve driving assembly is slidably mounted on the inner side of the driving sliding guide, the valve main body is rotatably mounted on the inner side of the smoke exhaust valve frame, two sides of the valve main body are respectively provided with a joint end and a butt groove, the joint ends and the butt grooves adjacent to two sides of the valve main body are mutually attached, the surface of the valve main body is provided with a heat insulation coating, the inner side of the smoke exhaust valve frame is rotatably mounted with a limiting connecting rod, and the other end of the limiting connecting rod is rotatably connected with the surface of the valve main body;
the valve drive assembly includes motion pole, slide, moves sliding sleeve and damping ride, door subassembly fixed mounting is closed in the tip fixed connection of inboard and one end and motion pole of the smooth guide of drive to the thermal expansion, the slide is fixed cup joints in the surface of motion pole and slidable mounting in the inboard of the smooth guide of drive, the bottom surface of damping ride is equipped with even axle sleeve, the top surface of valve main part is equipped with cup joints in the inboard spindle pin of even axle sleeve, the both sides of damping ride are equipped with the damping wheel, door subassembly is closed including being heated sleeve pipe, push rod and filling in the inboard thermal expansion liquid of heated sleeve pipe to the thermal expansion, the one end fixedly connected with of push rod slides and cup joints in the inboard piston plate of heated sleeve pipe.
The present invention in a preferred example may be further configured to: the quantity of valve main part is a plurality of, the butt joint groove is arc wall structure and size and connector end looks adaptation, the quantity of valve drive assembly is equal and the one-to-one is arranged with the quantity of valve main part, and a plurality of valve drive assembly's motion pole interconnect, spacing connecting rod symmetrical arrangement is at the upper and lower both ends of valve main part.
The present invention in a preferred example may be further configured to: the heat insulation coating is a vacuum cavity group consisting of nano hollow ceramic microspheres, and the thickness of the heat insulation coating is 5-10mm.
The present invention in a preferred example may be further configured to: the surface of the moving rod is fixedly and movably sleeved with a spring sleeve, two ends of the spring sleeve are fixedly connected with the surfaces of the sliding seat and the movable sliding sleeve respectively, and the damping trolley platform is fixedly arranged on the bottom surface of the movable sliding sleeve.
The present invention in a preferred example may be further configured to: the movable sliding sleeve is sleeved on the surface of the moving rod in a sliding mode, a rotary damper is fixedly mounted on the inner side of the connecting shaft sleeve, and the damping vehicle platform is abutted to the inner side of the driving sliding guide.
The present invention in a preferred example may be further configured to: the inner side of the thermal expansion door closing assembly is provided with a plurality of liquid pipes, the pipe diameters of the liquid pipes are 5-10mm, one side of the piston plate is fixedly provided with a push plate, and one side of the push plate is provided with a plurality of sliding pins matched with the liquid pipes.
The present invention in a preferred example may be further configured to: the heat expansion liquid is filled in the inner side of the liquid pipe and is abutted against one end of the sliding pin, the heat expansion liquid is one of kerosene or alcohol, the heated sleeve is a metal component, and a plurality of fins are arranged on the surface of the heated sleeve.
The beneficial effects obtained by the invention are as follows:
1. according to the invention, by arranging the novel automatic smoke exhaust valve structure, the valve main body is automatically pushed to perform deflection motion when the indoor smoke generates high pressure excessively, the movable sliding sleeve and the limiting connecting rod move close to each other to realize deflection of the valve main body and compression of the spring sleeve, smoke is rapidly exhausted, the structure is simple, and the stability of the mechanical structure is high.
2. According to the smoke exhaust valve, the novel valve main body structure is arranged, the joint ends and the butt grooves at the two ends of the valve main bodies are mutually connected and butted to achieve a high sealing effect, the heat insulation protection is carried out through the heat insulation coating, the problem that the valve main bodies cannot be closed due to material thermal expansion is avoided, and the sealing effect of the smoke exhaust valve is improved.
3. According to the smoke exhaust fire-proof valve, the thermal expansion door closing assembly structure is arranged, and under the high-temperature state caused by fire, the thermal expansion liquid in the thermal expansion door closing assembly is heated by the high temperature in a conduction mode, so that the thermal expansion liquid is heated to expand to push the push rod and the moving rod to move so as to pull the sliding sleeve to move, the distance between the moving sliding sleeve and the limiting connecting rod is increased to close the valve main body, and the smoke exhaust fire-proof valve is closed under the fire to avoid fire spreading.
Drawings
FIG. 1 is a schematic overall structure of an embodiment of the present invention;
FIG. 2 is a schematic view of an open state of a smoke evacuation valve according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a valve body according to an embodiment of the present invention;
FIG. 4 is a schematic view of a valve actuator assembly and a thermal expansion and closing door assembly according to an embodiment of the present invention;
FIG. 5 is a schematic view of a valve actuator assembly according to an embodiment of the present invention;
FIG. 6 is a schematic view of a dynamic sliding sleeve mounting structure according to an embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of a thermally inflatable door assembly according to an embodiment of the present invention.
Reference numerals:
100. a smoke exhaust valve frame; 110. driving the sliding guide; 120. a limiting connecting rod;
200. a valve body; 210. a main shaft pin; 220. a thermal barrier coating; 201. a joint end; 202. a butt joint groove;
300. a valve drive assembly; 310. a motion bar; 320. a slide base; 330. a movable sliding sleeve; 340. damping the vehicle platform; 331. a spring sleeve; 341. a coupling sleeve; 342. a damping wheel;
400. a thermally expandable door assembly; 410. a heated sleeve; 420. a push rod; 430. a piston plate; 440. thermally expanding the liquid; 411. a fin; 431. a push plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings in combination with the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The following describes a high-sealing smoke-discharging fire-resisting valve provided by some embodiments of the invention with reference to the attached drawings.
Referring to fig. 1 to 7, the present invention provides a high-sealing smoke-discharging fire-proof valve, including: the smoke exhaust valve comprises a smoke exhaust valve frame 100, a valve main body 200, a valve driving assembly 300 and a thermal expansion door closing assembly 400, wherein the top surface of the smoke exhaust valve frame 100 is provided with a driving sliding guide 110, the valve driving assembly 300 is slidably installed on the inner side of the driving sliding guide 110, the valve main body 200 is rotatably installed on the inner side of the smoke exhaust valve frame 100, two sides of the valve main body 200 are respectively provided with a joint end 201 and a butt groove 202, the joint ends 201 and the butt grooves 202 on two sides of the adjacent valve main body 200 are mutually attached, the surface of the valve main body 200 is provided with a heat insulation coating 220, the inner side of the smoke exhaust valve frame 100 is rotatably installed with a limiting connecting rod 120, and the other end of the limiting connecting rod 120 is rotatably connected with the surface of the valve main body 200;
the valve driving assembly 300 comprises a moving rod 310, a sliding seat 320, a moving sliding sleeve 330 and a damping carriage 340, the thermal expansion door closing assembly 400 is fixedly installed at the inner side of the driving sliding guide 110, one end of the thermal expansion door closing assembly is fixedly connected with the end of the moving rod 310, the sliding seat 320 is fixedly sleeved on the surface of the moving rod 310 and is slidably installed at the inner side of the driving sliding guide 110, a connecting shaft sleeve 341 is arranged on the bottom surface of the damping carriage 340, a spindle pin 210 sleeved on the inner side of the connecting shaft sleeve 341 is arranged on the top surface of the valve main body 200, damping wheels 342 are arranged on two sides of the damping carriage 340, the thermal expansion door closing assembly 400 comprises a heated sleeve 410, a push rod 420 and thermal expansion liquid 440 filled in the heated sleeve 410, and one end of the push rod 420 is fixedly connected with a piston plate 430 slidably sleeved on the inner side of the heated sleeve 410.
In this embodiment, the number of the valve main bodies 200 is several, the abutting grooves 202 are arc-shaped groove structures and the size of the abutting grooves is matched with the joint end 201, the number of the valve driving assemblies 300 is equal to the number of the valve main bodies 200 and the abutting grooves are arranged in a one-to-one correspondence manner, the moving rods 310 of the valve driving assemblies 300 are connected with each other, and the limiting connecting rods 120 are symmetrically arranged at the upper end and the lower end of the valve main bodies 200.
Specifically, the joint ends 201 and the abutting grooves 202 at both ends of the valve main body 200 are engaged and abutted with each other to achieve a high sealing effect.
In this embodiment, the thermal insulation coating 220 is a vacuum cavity group composed of nano hollow ceramic beads, and the thickness of the thermal insulation coating 220 is 5-10mm.
Specifically, the thermal insulation protection is performed through the thermal insulation coating 220, so that the problem that the valve main body 200 cannot be closed due to material thermal expansion is avoided, and the sealing effect of the smoke exhaust valve is improved.
In this embodiment, the surface of the motion rod 310 is fixedly movably sleeved with a spring sleeve 331, two ends of which are fixedly connected with the surfaces of the sliding base 320 and the movable sliding sleeve 330 respectively, and the damping platform 340 is fixedly installed on the bottom surface of the movable sliding sleeve 330.
Further, the movable sliding sleeve 330 is slidably sleeved on the surface of the movable rod 310, a rotary damper is fixedly mounted on the inner side of the coupling sleeve 341, and the damping platform 340 abuts against the inner side of the driving sliding guide 110.
Specifically, the dynamic sliding sleeve 330 is given a certain movement damping through the damping platform 340 and the coupling sleeve 341, so that the free movement of the damping platform 340 is prevented from causing the free deflection of the valve main body 200, and the valve main body 200 is kept stably sealed in a closed state by matching with the spring sleeve 331.
In this embodiment, the inner side of the door assembly 400 is provided with a plurality of liquid tubes, the diameter of the liquid tubes is 5-10mm, one side of the piston plate 430 is fixedly provided with a push plate 431, and one side of the push plate 431 is provided with a plurality of sliding pins matched with the liquid tubes.
Further, the thermal expansion liquid 440 is filled inside the liquid pipe and is abutted to one end of the sliding pin, the thermal expansion liquid 440 is one of kerosene or alcohol, the heated sleeve 410 is a metal member, and the surface of the heated sleeve 410 is provided with a plurality of fins 411.
Specifically, the thermal expansion door closing assembly 400 is heated by high temperature, the internal thermal expansion liquid 440 thermally expands to push the push rod 420 and the moving rod 310 to move, the sliding seat 320 and the moving rod 310 slide inside the driving sliding guide 110, and the thermal expansion liquid 440 is distributed inside the plurality of liquid pipes, so that the heating efficiency is improved.
The working principle and the using process of the invention are as follows:
in the daily use of the high-sealing smoke-discharging fire-resisting damper, the spring sleeve 331 is in a natural state, the distance between the movable sliding sleeve 330 and the limiting connecting rod 120 is determined, the valve main body 200 and the smoke-discharging valve frame 100 are in a parallel state, and the joint ends 201 at the two sides of each valve main body 200 are mutually jointed with the abutting grooves 202 to realize the sealing of the whole smoke-discharging fire-resisting damper; when smoke is required to be exhausted, due to the action of a high pressure of a flue or a smoke exhaust machine on smoke, the smoke pushes the valve main body 200 to perform deflection motion, under the deflection action of the valve main body 200, the limiting connecting rod 120 deflects and drives the movable sliding sleeve 330 to slide on the surface of the moving rod 310, the limiting connecting rod 120 is intersected with the valve main body 200, the movable sliding sleeve 330 moves close to one side of the sliding seat 320 to compress the spring sleeve 331, as shown in fig. 5, the spring sleeve 331 deforms and stores force after being compressed, and after the smoke kinetic energy disappears or the smoke pressure is reduced, the spring sleeve 331 deforms and recovers to release deformation potential energy to push the movable sliding sleeve 330 to reset, so that the valve main body 200 recovers a closed state, and in the smoke exhaust process, the heat insulation protection is performed through the heat insulation coating 220 to avoid the problem that the valve main body 200 cannot be closed due to material thermal expansion;
when a fire occurs indoors, high pressure is generated due to overhigh indoor temperature, so that the valve main body 200 can be freely opened, if the valve main body 200 is opened, the spreading of the fire can be aggravated due to the entrance of external oxygen, and when the smoke exhaust fire damper senses the high temperature of the fire, the thermal expansion door closing assembly 400 is heated due to the high temperature, the internal thermal expansion liquid 440 thermally expands to push the push rod 420 and the moving rod 310 to move, the sliding seat 320 and the moving rod 310 slide inside the driving sliding guide 110, the spring sleeve 331 pulls the sliding sleeve 330 to move, so that the valve main body 200 is closed under the guidance of the limiting connecting rod 120, the smoke exhaust channel is closed, the oxygen exchange efficiency is reduced, the diffusion of the fire is avoided, and the fire prevention effect is realized.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (6)
1. The utility model provides a high sealed fire prevention valve that discharges fume which characterized in that includes: the smoke exhaust valve comprises a smoke exhaust valve frame (100), a valve main body (200), a valve driving assembly (300) and a thermal expansion door closing assembly (400), wherein a driving sliding guide (110) is arranged on the top surface of the smoke exhaust valve frame (100), the valve driving assembly (300) is installed on the inner side of the driving sliding guide (110) in a sliding mode, the valve main body (200) is installed on the inner side of the smoke exhaust valve frame (100) in a rotating mode, a joint end (201) and a butt joint groove (202) are respectively arranged on two sides of the valve main body (200), the joint end (201) and the butt joint groove (202) on two adjacent sides of the valve main body (200) are attached to each other, a heat insulation coating (220) is arranged on the surface of the valve main body (200), a limiting connecting rod (120) is installed on the inner side of the smoke exhaust valve frame (100) in a rotating mode, and the other end of the limiting connecting rod (120) is connected with the surface of the valve main body (200) in a rotating mode;
valve drive assembly (300) is including motion pole (310), slide (320), move sliding sleeve (330) and damping ride (340), thermal expansion door subassembly (400) fixed mounting is in the inboard of drive sliding guide (110) and the tip fixed connection of one end and motion pole (310), slide (320) fixed cover connects in the surface of motion pole (310) and slidable mounting in the inboard of drive sliding guide (110), the bottom surface of damping ride (340) is equipped with even axle sleeve (341), the top surface of valve main part (200) is equipped with cup joints in even axle sleeve (341) inboard spindle pin (210), the both sides of damping ride (340) are equipped with damping wheel (342), the fixed surface activity of motion pole (310) cup joints the spring bushing (331) that both ends are connected with slide (320) and movable sliding sleeve (330) fixed surface respectively, damping ride (340) fixed mounting is in the bottom surface of moving sliding sleeve (330), thermal expansion door subassembly (400) is including being heated sleeve (410), push rod (420) and fill in the inboard liquid sleeve (420) that is heated, the piston plate (410) is connected with the inboard of expansion door subassembly (410) is connected with the piston plate (410).
2. The high-sealing smoke exhaust fire valve according to claim 1, wherein the number of the valve main bodies (200) is a plurality, the abutting grooves (202) are arc-shaped groove structures, the size of the abutting grooves is matched with the joint ends (201), the number of the valve driving assemblies (300) is equal to that of the valve main bodies (200) and the abutting grooves are arranged in a one-to-one correspondence manner, the moving rods (310) of the valve driving assemblies (300) are connected with each other, and the limiting connecting rods (120) are symmetrically arranged at the upper end and the lower end of the valve main bodies (200).
3. The high-sealing smoke exhaust fire damper according to claim 1, wherein the heat insulation coating (220) is a vacuum cavity group consisting of nano hollow ceramic micro beads, and the thickness of the heat insulation coating (220) is 5-10mm.
4. The high-sealing smoke exhaust and fire prevention valve according to claim 1, wherein the movable sliding sleeve (330) is slidably sleeved on the surface of the movable rod (310), a rotary damper is fixedly mounted on the inner side of the coupling sleeve (341), and the damping platform (340) is abutted against the inner side of the driving sliding guide (110).
5. The high-sealing smoke evacuation fire damper according to claim 1, wherein a plurality of liquid pipes are arranged on the inner side of the thermal expansion door closing assembly (400), the pipe diameter of each liquid pipe is 5-10mm, a push plate (431) is fixedly arranged on one side of the piston plate (430), and a plurality of sliding pins matched with the liquid pipes are arranged on one side of the push plate (431).
6. The high sealing smoke exhaust fire prevention valve according to claim 1, wherein the heat expansion liquid (440) is filled inside the liquid pipe and abuts against one end of the sliding pin, the heat expansion liquid (440) is one of kerosene or alcohol, the heat receiving sleeve (410) is a metal member, and the surface of the heat receiving sleeve (410) is provided with a plurality of fins (411).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310239557.XA CN115949788B (en) | 2023-03-14 | 2023-03-14 | High-sealing smoke-discharging fireproof valve |
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| CN202310239557.XA CN115949788B (en) | 2023-03-14 | 2023-03-14 | High-sealing smoke-discharging fireproof valve |
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| CN115949788A true CN115949788A (en) | 2023-04-11 |
| CN115949788B CN115949788B (en) | 2023-05-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116717620A (en) * | 2023-08-09 | 2023-09-08 | 瑞冬集团股份有限公司 | Fire control pipeline is with fire prevention valve that discharges fume |
| CN116989154A (en) * | 2023-09-27 | 2023-11-03 | 江苏友发智能管道有限公司 | Fire control air pipe valve |
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| US4552221A (en) * | 1982-08-13 | 1985-11-12 | Wilfried Klein | Dry-head or deluge-type valve for fire-extinguishing systems |
| CN206377288U (en) * | 2016-12-29 | 2017-08-04 | 瑞冬集团有限公司 | The fire and smoke exhaust valve of new structure |
| CN208669854U (en) * | 2018-08-20 | 2019-03-29 | 珠海市德亚玻璃钢制品有限公司 | A kind of smoke exhaust fire damper |
| CN213206687U (en) * | 2020-09-11 | 2021-05-14 | 浙江聚英风机工业有限公司 | On-site opening and closing high-altitude smoke-discharging fireproof valve |
| CN215172571U (en) * | 2021-01-20 | 2021-12-14 | 应急管理部四川消防研究所 | Fireproof and smoke exhaust valve with monitoring function |
| CN215980841U (en) * | 2021-09-17 | 2022-03-08 | 河南瑞泰暖通科技有限公司 | Fire-fighting smoke-discharging fire-isolating valve capable of improving airtightness |
| CN216242352U (en) * | 2021-11-16 | 2022-04-08 | 巢湖市宏吉消防维保有限责任公司 | Fire-proof smoke-discharging valve for fire-fighting smoke-discharging air pipe |
-
2023
- 2023-03-14 CN CN202310239557.XA patent/CN115949788B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4552221A (en) * | 1982-08-13 | 1985-11-12 | Wilfried Klein | Dry-head or deluge-type valve for fire-extinguishing systems |
| CN206377288U (en) * | 2016-12-29 | 2017-08-04 | 瑞冬集团有限公司 | The fire and smoke exhaust valve of new structure |
| CN208669854U (en) * | 2018-08-20 | 2019-03-29 | 珠海市德亚玻璃钢制品有限公司 | A kind of smoke exhaust fire damper |
| CN213206687U (en) * | 2020-09-11 | 2021-05-14 | 浙江聚英风机工业有限公司 | On-site opening and closing high-altitude smoke-discharging fireproof valve |
| CN215172571U (en) * | 2021-01-20 | 2021-12-14 | 应急管理部四川消防研究所 | Fireproof and smoke exhaust valve with monitoring function |
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| CN216242352U (en) * | 2021-11-16 | 2022-04-08 | 巢湖市宏吉消防维保有限责任公司 | Fire-proof smoke-discharging valve for fire-fighting smoke-discharging air pipe |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116717620A (en) * | 2023-08-09 | 2023-09-08 | 瑞冬集团股份有限公司 | Fire control pipeline is with fire prevention valve that discharges fume |
| CN116717620B (en) * | 2023-08-09 | 2023-10-20 | 瑞冬集团股份有限公司 | Fire control pipeline is with fire prevention valve that discharges fume |
| CN116989154A (en) * | 2023-09-27 | 2023-11-03 | 江苏友发智能管道有限公司 | Fire control air pipe valve |
| CN116989154B (en) * | 2023-09-27 | 2023-12-05 | 江苏友发智能管道有限公司 | Fire control air pipe valve |
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| CN115949788B (en) | 2023-05-16 |
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