CN109253292B - Air-permeable valve for ship and air pressure balancing method - Google Patents
Air-permeable valve for ship and air pressure balancing method Download PDFInfo
- Publication number
- CN109253292B CN109253292B CN201811431857.3A CN201811431857A CN109253292B CN 109253292 B CN109253292 B CN 109253292B CN 201811431857 A CN201811431857 A CN 201811431857A CN 109253292 B CN109253292 B CN 109253292B
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- piston
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- sealing sleeve
- sealing
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 77
- 238000009423 ventilation Methods 0.000 abstract description 36
- 230000000694 effects Effects 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
Abstract
The invention discloses a ship ventilation valve and an air pressure balancing method, which comprise a valve body, wherein a ventilation pipe is arranged in the valve body, air ports are formed in two sides of the bottom of the ventilation pipe, a piston is arranged on the surface of the ventilation pipe, a connecting rod is arranged at the top of the piston, a movable ring is arranged at the top of the connecting rod, springs are arranged at the top of the piston and the bottom of the movable ring, a sealing sleeve is arranged at the bottom of the piston, first through holes are formed in two sides of the bottom of the sealing sleeve, second through holes are formed in two sides of the top of the sealing sleeve, and a first valve cover is arranged at the top of the valve body. According to the invention, the piston and the sealing sleeve move up and down under the change of air pressure, so that the sealing sleeve is driven to move, the first port or the second port is respectively communicated with the air port, the air pressure in the cabin is balanced, the air pressure is balanced by only one ventilation pipe, the management of the ventilation valve is convenient, and the sealing effect of the ventilation valve is improved.
Description
Technical Field
The invention relates to the technical field of ship equipment, in particular to a ship ventilation valve and an air pressure balancing method.
Background
The marine high-speed air-permeable valve is special equipment for fire prevention and safety of ships, is arranged at the top of each oil tank of an oil ship or a chemical ship and is used for releasing the phenomena of explosion or container damage caused by excessive high pressure or low pressure due to temperature change in the transportation and storage process in the cargo tanks;
the high-speed ventilation valve for the ship has the patent application number of 201720079912.1, the piston is pushed by high air pressure to extrude the first spring, and finally the third through hole is communicated with the first through hole when the pressure is limited, so that the high pressure in the cabin is released; the atmospheric pressure enters the sleeve through the first through hole and the second through hole, and the steel ball is ejected out, so that the internal pressure can be balanced, the phenomenon of shrinkage caused by the excessively low internal pressure is avoided, and the sleeve has good protection effect both at high pressure and at low pressure; however, in the process of balancing the air pressure in the cabin, a plurality of through holes communicated with the outside are needed to be utilized on the valve body, so that the air inlet and outlet of the ventilation valve are complex, the management of the ventilation valve is influenced, and the sealing effect of the ventilation valve is also influenced.
Therefore, it is necessary to solve the above problems by providing a ship air-permeable valve and an air pressure balancing method.
Disclosure of Invention
The invention aims to provide an air ventilation valve for a ship and an air pressure balancing method, wherein a piston and a sealing sleeve are arranged, the piston moves up and down under the air pressure change to drive the sealing sleeve to move, the first port or the second port is respectively communicated with an air port, the air pressure in a cabin is balanced, the air pressure is balanced by only one ventilation pipe, the management of the air ventilation valve is convenient, the sealing effect of the air ventilation valve is improved, and the problems in the background art are solved.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a breather valve for boats and ships, includes the valve body, the inside breather pipe that is provided with of valve body, breather pipe bottom both sides all are provided with the gas port, the breather pipe surface is provided with the piston, the piston top is provided with the connecting rod, the connecting rod top is provided with the expansion ring, piston top and expansion ring bottom all are provided with the spring, the piston bottom is provided with sealed sleeve, sealed sleeve bottom both sides all are provided with first through-hole, sealed sleeve top both sides all are provided with the second through-hole, the valve body top is provided with first valve gap.
Preferably, one side of the valve body is provided with an emergency air passage, one end of the emergency air passage is provided with a second valve cover, the middle part of the second valve cover is provided with a push rod, the inner end of the push rod is provided with a sealing disc, one side of the surface of the sealing disc is provided with a sealing gasket, the surface of the sealing gasket is provided with a fixed screw hole, the surface of the second valve cover is provided with a through hole, and a locking bolt is arranged in the through hole.
Preferably, a fixing frame is arranged at the top of the second valve cover, an operating rod is arranged at one end of the fixing frame, and an anti-slip ferrule is arranged on the top surface of the operating rod.
Preferably, the breather pipe and the connecting rod penetrate through the top of the valve body, the piston is movably connected with the valve body, the piston, the movable ring and the first valve cover of the sealing sleeve are sleeved with the breather pipe, the spring is sleeved with the connecting rod, and the first through port and the second through port are matched with the air port.
Preferably, the push rod is movably connected with the second valve cover, the fixed screw hole is fixedly connected with the sealing disc, the fixed screw hole is matched with the through hole, and the locking bolt is in threaded connection with the fixed screw hole.
Preferably, the operation rod is movably connected with the fixing frame, and the operation rod is hinged with the outer end of the push rod.
The air pressure balancing method of the ship air-permeable valve comprises the ship air-permeable valve and further comprises the following steps:
s1: when the air pressure in the cabin is too high, the high air pressure pushes the piston to rise;
s2: compressing the spring at the top of the piston, and lifting the sealing sleeve at the bottom of the piston along with the piston;
s3: the first through hole at the bottom of the sealing sleeve is communicated with the air hole, so that the high pressure in the cabin is released, and the pressure in the cabin is relieved;
s4: the compressed spring enables the piston to reset, the sealing sleeve is reset, and the air port is closed;
s5: when the pressure is too low, the external air pressure pushes the piston to descend and pushes the sealing sleeve to descend;
s6: the connecting rod at the top of the piston pulls the movable ring to descend and compresses the spring at the bottom of the movable ring;
s7: the second port at the top of the sealing sleeve is communicated with the air port, and air is filled into the cabin to balance the internal pressure;
s8: the compressed spring enables the piston to reset, the sealing sleeve is reset, the air port is closed, and air pressure balance is achieved.
The invention has the technical effects and advantages that:
(1) According to the invention, the piston is arranged, when the air pressure in the cabin is too high, the high air pressure pushes the piston to rise, the spring at the top of the piston is compressed, the movable sleeve at the bottom of the piston rises along with the piston, the first through hole at the bottom of the movable sleeve is communicated with the air port, the high pressure in the cabin is released, the pressure in the cabin is relieved, the piston is reset through the compressed spring, the sealing sleeve returns along with the resetting, and the air port is closed; when the pressure is too low, the external air pressure pushes the piston to descend, the sealing sleeve is pushed to descend, the connecting rod at the top of the piston pulls the movable ring to descend, the spring at the bottom of the movable ring is compressed, the second port at the top of the sealing sleeve is communicated with the air port, air is filled into the cabin to balance the internal pressure, the piston is reset through the compressed spring, the sealing sleeve follows the reset to seal the air port, air pressure balance is realized by only using one ventilation pipe, management of the ventilation valve is facilitated, and the sealing effect of the ventilation valve is improved;
(2) According to the invention, the emergency air passage is arranged, when the ventilation valve is abnormal, the locking bolt is taken down from the fixed screw hole, the operating rod is rotated, the operating rod rotates around the fixed frame and is hinged with the push rod, the push rod is pushed to move inwards of the valve body, the sealing disc is pushed by utilizing the lever principle, the emergency air passage is communicated with the through hole, and the air pressure in the cabin is manually balanced, so that the emergency operation of the ventilation valve is facilitated when the ventilation valve is out of order, and the safety performance of the ventilation valve is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic overall sectional view of the present invention;
FIG. 3 is a schematic view of the portion A of FIG. 2 according to the present invention;
FIG. 4 is a schematic side view of the sealing disk of the present invention;
in the figure: the valve comprises a valve body 1, a vent pipe 2, a gas port 3, a piston 4, a connecting rod 5, a movable ring 6, a spring 7, a sealing sleeve 8, a first port 9, a second port 10, a first valve cover 11, an emergency gas passage 12, a second valve cover 13, a push rod 14, a sealing disk 15, a sealing gasket 16, a fixing screw hole 17, a through hole 18, a locking bolt 19, a fixing frame 20, an operating rod 21 and an anti-slip ferrule 22.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The invention provides a ship ventilation valve as shown in figures 1-4, which comprises a valve body 1, wherein a ventilation pipe 2 is arranged in the valve body 1, ventilation pipes 2 are utilized for ventilation of cabin air and cabin air, air ports 3 are arranged on two sides of the bottom of the ventilation pipe 2, a piston 4 is arranged on the surface of the ventilation pipe 2, a connecting rod 5 is arranged at the top of the piston 4, a movable ring 6 is arranged at the top of the connecting rod 5, springs 7 are arranged at the top of the piston 4 and the bottom of the movable ring 6, the same springs 7 are arranged at the bottom of the piston 4, the bottom of the piston 4 is provided with a sealing sleeve 8, first through holes 9 are arranged on two sides of the bottom of the sealing sleeve 8, second through holes 10 are arranged on two sides of the top of the sealing sleeve 8, and a first valve cover 11 is arranged at the top of the valve body 1.
Further, in the above technical solution, an emergency air passage 12 is provided on one side of the valve body 1, a second valve cover 13 is provided at one end of the emergency air passage 12, a push rod 14 is provided in the middle of the second valve cover 13, a sealing disc 15 is provided at the inner end of the push rod 14, a sealing gasket 16 is provided on one side of the surface of the sealing disc 15, the sealing disc 15 is tightly contacted with the second valve cover 13 by using the sealing gasket 16, sealing of a through hole 18 is achieved, a fixing screw hole 17 is provided on the surface of the sealing gasket 16, a through hole 18 is provided on the surface of the second valve cover 13, and a locking bolt 19 is provided inside the through hole 18;
further, in the above technical solution, a fixing frame 20 is provided at the top of the second valve cover 13, an operation rod 21 is provided at one end of the fixing frame 20, and an anti-slip ferrule 22 is provided on the top surface of the operation rod 21, so that the operation rod 21 is convenient to use;
furthermore, in the above technical scheme, the vent pipe 2 and the connecting rod 5 penetrate through the top of the valve body 1, the piston 4 is movably connected with the valve body 1, the piston 4, the movable ring 6, the sealing sleeve 8 and the first valve cover 11 are all sleeved with the vent pipe 2, the spring 7 is sleeved with the connecting rod 5, the first through hole 9 and the second through hole 10 are matched with the air port 3, the piston 4 moves up and down under the change of air pressure, the sealing sleeve 8 is driven to move, the first through hole 9 or the second through hole 10 are respectively communicated with the air port 3, the air pressure in the cabin is balanced, the air pressure balance is realized by only using one vent pipe 2, the management of the air vent valve is facilitated, and the sealing effect of the air vent valve is improved;
further, in the above technical solution, the push rod 14 is movably connected with the second valve cover 13, the fixing screw hole 17 is fixedly connected with the sealing disc 15, the fixing screw hole 17 is matched with the through hole 18, the locking bolt 19 is in threaded connection with the fixing screw hole 17, and the locking bolt passes through the through hole 18 to be in threaded connection with the fixing screw hole 17, so as to fix the sealing disc 15 and improve the sealing of the emergency air passage 12;
further, in the above technical solution, the operation rod 21 is movably connected with the fixing frame 20, the operation rod 21 is hinged to the outer end of the push rod 14, the operation rod is rotated, the operation rod rotates around the fixing frame, the operation rod is hinged to the push rod in cooperation, the push rod is pushed to move inwards, the sealing disc is pushed by utilizing the lever principle, and the emergency air passage is communicated with the through hole.
The working mode of the invention is as follows:
referring to the accompanying drawings 1-2 of the specification, when the air pressure in the cabin is too high, the high air pressure pushes the piston 4 to rise, compresses the spring 7 at the top of the piston 4, the sealing sleeve 8 at the bottom of the piston 4 rises along with the piston 4, the first through hole 9 at the bottom of the sealing sleeve 8 is communicated with the air port 3, the high pressure in the cabin is released, the pressure in the cabin is relieved, the piston 4 is reset through the compressed spring 7, and the sealing sleeve 8 is reset along with the resetting to seal the air port 3; when the pressure is too low, the external air pressure pushes the piston 4 to descend, pushes the sealing sleeve 8 to descend, the connecting rod 5 at the top of the piston 4 pulls the movable ring 6 to descend, the spring 7 at the bottom of the movable ring 6 is compressed, the second port 10 at the top of the sealing sleeve 8 is communicated with the air port 3, air is filled into the cabin to balance the internal pressure, the piston 4 is reset through the compressed spring 7, the sealing sleeve 8 follows the reset to seal the air port 3, so that the air pressure balance is realized by only using one ventilation pipe 2, the management of the ventilation valve is facilitated, and the sealing effect of the ventilation valve is improved;
referring to fig. 1, 3 and 4 of the specification, when the ventilation valve is abnormal, the locking bolt 19 is firstly removed from the fixed screw hole 17, then the operating rod 21 is rotated, the operating rod 21 rotates by taking the fixing frame 20 as the center, the operating rod 21 is hinged with the push rod 14 to push the push rod 14 to move into the valve body 1, the sealing disc 15 is pushed by utilizing the lever principle, the emergency air channel 12 is communicated with the through hole 18, and the air pressure in the cabin is manually balanced, so that emergency operation is carried out on the ventilation valve when the ventilation valve fails, and the safety performance of the ventilation valve is improved.
Example 2
The air pressure balancing method of the ship air-permeable valve comprises the ship air-permeable valve and further comprises the following steps:
s1: when the air pressure in the cabin is too high, the piston 4 is pushed to rise by the high air pressure;
s2: a spring 7 at the top of the piston 4 is compressed, and a sealing sleeve 8 at the bottom of the piston 4 rises along with the piston 4;
s3: the first through hole 9 at the bottom of the sealing sleeve 8 is communicated with the air port 3, so that the high pressure in the cabin is released, and the pressure in the cabin is relieved;
s4: the compressed spring 7 enables the piston 4 to reset, the sealing sleeve 8 follows the reset, and the air port 3 is closed;
s5: when the pressure is too low, the external air pressure pushes the piston 4 to descend and pushes the sealing sleeve 8 to descend;
s6: the connecting rod 5 at the top of the piston 4 pulls the movable ring 6 to descend, and compresses the spring 7 at the bottom of the movable ring 6;
s7: a second port 10 at the top of the sealing sleeve 8 is communicated with the air port 3, and air is filled into the cabin to balance the internal pressure;
s8: the compressed spring 7 enables the piston 4 to reset, the sealing sleeve 8 follows the reset, the air port 3 is closed, and air pressure balance is achieved.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (5)
1. The utility model provides a breather valve for boats and ships, includes valve body (1), its characterized in that: the novel valve is characterized in that a vent pipe (2) is arranged inside the valve body (1), air ports (3) are formed in two sides of the bottom of the vent pipe (2), a piston (4) is arranged on the surface of the vent pipe (2), a connecting rod (5) is arranged at the top of the piston (4), a movable ring (6) is arranged at the top of the connecting rod (5), springs (7) are arranged at the top of the piston (4) and the bottom of the movable ring (6), a sealing sleeve (8) is arranged at the bottom of the piston (4), first through holes (9) are formed in two sides of the bottom of the sealing sleeve (8), second through holes (10) are formed in two sides of the top of the sealing sleeve (8), and a first valve cover (11) is arranged at the top of the valve body (1).
An emergency air passage (12) is formed in one side of the valve body (1), a second valve cover (13) is arranged at one end of the emergency air passage (12), a push rod (14) is arranged in the middle of the second valve cover (13), a sealing disc (15) is arranged at the inner end of the push rod (14), a sealing gasket (16) is arranged on one side of the surface of the sealing disc (15), a fixing screw hole (17) is formed in the surface of the sealing gasket (16), a through hole (18) is formed in the surface of the second valve cover (13), and a locking bolt (19) is arranged in the through hole (18);
breather pipe (2) and connecting rod (5) all run through valve body (1) top, piston (4) and valve body (1) swing joint, piston (4), expansion ring (6), sealed sleeve (8) and first valve gap (11) all cup joint with breather pipe (2), spring (7) cup joint with connecting rod (5), first opening (9) and second opening (10) all match with gas port (3).
2. The marine breather valve according to claim 1, wherein: the top of the second valve cover (13) is provided with a fixing frame (20), one end of the fixing frame (20) is provided with an operating rod (21), and the top surface of the operating rod (21) is provided with an anti-slip ferrule (22).
3. The marine breather valve according to claim 1, wherein: the push rod (14) is movably connected with the second valve cover (13), the fixed screw hole (17) is fixedly connected with the sealing disc (15), the fixed screw hole (17) is matched with the through hole (18), and the locking bolt (19) is in threaded connection with the fixed screw hole (17).
4. A marine breather valve according to claim 2, wherein: the operating rod (21) is movably connected with the fixing frame (20), and the operating rod (21) is hinged with the outer end of the push rod (14).
5. The air pressure balancing method of the ship air-permeable valve is characterized by comprising the following steps of: comprising the marine breather valve according to claim 1, further comprising the steps of:
s1: when the air pressure in the cabin is too high, the piston (4) is pushed to rise by the high air pressure;
s2: a spring (7) at the top of the piston (4) is compressed, and a sealing sleeve (8) at the bottom of the piston (4) rises along with the piston (4);
s3: a first through hole (9) at the bottom of the sealing sleeve (8) is communicated with the air hole (3) to release high pressure in the cabin and lighten the pressure in the cabin;
s4: the compressed spring (7) enables the piston (4) to reset, the sealing sleeve (8) is reset in a following way, and the air port (3) is closed;
s5: when the pressure is too low, the external air pressure pushes the piston (4) to descend and pushes the sealing sleeve (8) to descend;
s6: the connecting rod (5) at the top of the piston (4) pulls the movable ring (6) to descend, and compresses the spring (7) at the bottom of the movable ring (6);
s7: a second port (10) at the top of the sealing sleeve (8) is communicated with the air port (3), and air is filled into the cabin to balance the internal pressure;
s8: the compressed spring (7) enables the piston (4) to reset, the sealing sleeve (8) resets in a following way, the air port (3) is closed, and air pressure balance is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811431857.3A CN109253292B (en) | 2018-11-28 | 2018-11-28 | Air-permeable valve for ship and air pressure balancing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811431857.3A CN109253292B (en) | 2018-11-28 | 2018-11-28 | Air-permeable valve for ship and air pressure balancing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109253292A CN109253292A (en) | 2019-01-22 |
| CN109253292B true CN109253292B (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811431857.3A Active CN109253292B (en) | 2018-11-28 | 2018-11-28 | Air-permeable valve for ship and air pressure balancing method |
Country Status (1)
| Country | Link |
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| CN (1) | CN109253292B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320942B (en) * | 2019-05-31 | 2022-10-11 | 吉林省农业科学院 | Open-circuit animal breath heat measuring device |
| CN113260180B (en) * | 2021-06-30 | 2021-10-01 | 深之蓝(天津)水下智能科技有限公司 | Underwater sealed cabin and underwater equipment with electronic element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3916260A1 (en) * | 1989-05-19 | 1990-11-22 | Voss Richard Grubenausbau | Small pressure restricting valve with high rate of flow - has tubular sleeve forming valve piston containing interconnecting throttle bore |
| CN202338668U (en) * | 2011-11-30 | 2012-07-18 | 神华集团有限责任公司 | Self-reliance breather valve |
| CN207470863U (en) * | 2017-10-12 | 2018-06-08 | 四川德力铁道科技有限公司 | A kind of type of respiration valve |
| CN207554894U (en) * | 2017-12-04 | 2018-06-29 | 上海凯凡石化设备有限公司 | A kind of manhole fire-retardant breather valve |
| CN207729018U (en) * | 2018-01-04 | 2018-08-14 | 南通瑞达航海机械有限公司 | A kind of lock type ship high-speed ventilation valve |
| CN207921419U (en) * | 2018-03-05 | 2018-09-28 | 福托伟阀门(上海)有限公司 | A kind of breather valve |
| CN108709002A (en) * | 2018-07-30 | 2018-10-26 | 乐清市阀门厂 | A kind of high-speed ventilation valve |
-
2018
- 2018-11-28 CN CN201811431857.3A patent/CN109253292B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3916260A1 (en) * | 1989-05-19 | 1990-11-22 | Voss Richard Grubenausbau | Small pressure restricting valve with high rate of flow - has tubular sleeve forming valve piston containing interconnecting throttle bore |
| CN202338668U (en) * | 2011-11-30 | 2012-07-18 | 神华集团有限责任公司 | Self-reliance breather valve |
| CN207470863U (en) * | 2017-10-12 | 2018-06-08 | 四川德力铁道科技有限公司 | A kind of type of respiration valve |
| CN207554894U (en) * | 2017-12-04 | 2018-06-29 | 上海凯凡石化设备有限公司 | A kind of manhole fire-retardant breather valve |
| CN207729018U (en) * | 2018-01-04 | 2018-08-14 | 南通瑞达航海机械有限公司 | A kind of lock type ship high-speed ventilation valve |
| CN207921419U (en) * | 2018-03-05 | 2018-09-28 | 福托伟阀门(上海)有限公司 | A kind of breather valve |
| CN108709002A (en) * | 2018-07-30 | 2018-10-26 | 乐清市阀门厂 | A kind of high-speed ventilation valve |
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| CN109253292A (en) | 2019-01-22 |
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