CN108799583B - Pressure reducing valve feedback gas balancer - Google Patents
Pressure reducing valve feedback gas balancer Download PDFInfo
- Publication number
- CN108799583B CN108799583B CN201810984505.4A CN201810984505A CN108799583B CN 108799583 B CN108799583 B CN 108799583B CN 201810984505 A CN201810984505 A CN 201810984505A CN 108799583 B CN108799583 B CN 108799583B
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- valve
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 description 25
- 230000000694 effects Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
-
- 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
- F16K17/32—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting on a servo-mechanism or on a catch-releasing mechanism
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention discloses a pressure reducing valve feedback gas balancer, which relates to the technical field of pressure reducing valves, and comprises a valve body, wherein an inlet end and an outlet end are respectively arranged at two ends of the valve body, a gas conveying cavity is arranged between the inlet end and the outlet end and is internally provided with a valve port, a valve rod capable of moving up and down in the valve port is arranged in the gas conveying cavity, the bottom of the valve rod is connected with a valve clack positioned below the valve port, an annular valve sleeve matched with the valve clack is arranged in the valve port, the valve rod penetrates through the annular valve sleeve, at least two uniformly distributed buffer holes are formed in the bottom of the annular valve sleeve, buffer springs are connected to the inner top of each buffer hole, ejector rods matched with the buffer holes are connected to the other ends of the buffer springs, and a plurality of steel balls positioned right below the corresponding ejector rods are embedded on the upper surface of the valve clack.
Description
Technical Field
The invention relates to the technical field of pressure reducing valves, in particular to a pressure reducing valve feedback gas balancer.
Background
The gas pressure reducing valve is a special device for automatically reducing the working pressure of the pipeline, and can reduce the higher liquid pressure of the pipeline in front of the valve to the level required by the pipeline behind the valve. The pressure reducing valve has various structural types, and can be divided into a film type, a spring film type, a piston type, a lever type, a bellows type and the like according to the structural form, and can be manually single-seat type and double-seat type according to the number of valve seats, and can be divided into a positive action type and a negative action type according to the different positions of valve clacks, and can be divided into a nitrogen pressure reducing valve, a hydrogen pressure reducing valve, an oxygen pressure reducing valve and the like according to media.
The gas relief pressure valve is in the high-pressure gas of entrance point input back, forms low-pressure gas through the relief pressure valve effect, and the pressure value when low-pressure gas comes out from the exit end is P, and P floats in certain fluctuation range to form dynamic balance, in this course of working, the inside valve rod of relief pressure valve is under the fluctuation effect of atmospheric pressure along the inside valve port of valve body and is floated from top to bottom, if the range of floating is too big, the valve clack of valve rod bottom can violently strike in valve port department, and the vibrations feel is stronger, causes the damage to the valve body, causes whole relief pressure valve trouble when serious, and the security is low, and life cycle is short.
It is therefore very practical to a person skilled in the art how to solve the above-mentioned technical problems.
Disclosure of Invention
The invention aims at: the invention provides a feedback gas balancer of a pressure reducing valve, which aims to solve the technical problems that the pressure reducing valve is easy to break down due to strong vibration sense and severe impact when the existing gas pressure reducing valve works.
The invention adopts the following technical scheme for realizing the purposes:
the utility model provides a relief pressure valve feedback gas balancer, which comprises a valve body, the valve body both ends are provided with entrance point and exit point respectively, be provided with the gas transportation chamber that is located between entrance point and the exit point in the valve body, be provided with the valve port in the gas transportation chamber, be provided with the valve rod that can reciprocate in the valve port in the gas transportation chamber, the valve rod bottom is connected with the valve clack that is located the valve port below, be provided with in the valve port with valve clack complex annular valve pocket, the valve rod passes annular valve pocket, at least two equipartition's buffer holes have been seted up to annular valve pocket bottom, the top all is connected with buffer spring in the buffer hole, the buffer spring other end all is connected with buffer hole complex ejector pin, the valve clack upper surface inlays and has a plurality of steel balls that are located under the corresponding ejector pin.
Further, be provided with the balanced chamber that is located the gas delivery chamber top in the valve body, be provided with the signal feedback pipe between exit end and the balanced chamber bottom, be provided with the main diaphragm that has elasticity in the balanced chamber, main diaphragm both ends are fixed at balanced chamber side, the valve rod passes main diaphragm, the valve rod top is connected with the balanced spring with main diaphragm upper surface contact, be provided with the piston chamber that is located balanced chamber top in the valve body, balanced spring top is connected with the piston piece that can slide from top to bottom in the piston chamber, the piston piece is connected with the telescopic link that stretches out the piston chamber, the equipartition has a plurality of scale marks on the telescopic link.
Further, the telescopic link upper end is provided with the trigger piece, and piston chamber outer top is provided with the trigger switch that is located the trigger piece under, and trigger switch electric connection has the siren that sets up at the valve body outer wall.
Further, two ends of the signal feedback tube are respectively connected between the outlet end and the bottom of the balance cavity through connecting screws.
Further, the balance cavity is surrounded by two detachably connected shells, and the balance cavity is in an ellipsoidal shape as a whole.
The beneficial effects of the invention are as follows:
1. when the air pressure fluctuation is large, the valve rod drives the valve clack to move upwards to be close to the valve port, at the moment, the steel balls on the valve clack are firstly close to the ejector rod on the annular valve sleeve positioned at the valve port, and the ejector rod stretches into the buffer hole and extrudes the buffer spring, so that the upward moving speed of the valve clack is reduced, the valve clack and the valve rod are slowly and stably lowered, the point-to-surface contact between the steel balls and the ejector rod is adopted, the traditional direct surface-to-surface contact is changed, the direct contact between the valve clack and the annular valve sleeve is avoided, the severe vibration is reduced, the damage to the internal components of the valve body is prevented, the use safety is ensured, and the service cycle of the valve body is prolonged.
2. When the air pressure transmitted to the balance cavity through the signal feedback tube acts on the main diaphragm, the main diaphragm swings up and down, meanwhile, the main diaphragm applies acting force to the balance spring, the balance spring drives the valve rod to move up and down, meanwhile, the balance spring continuously stretches out and draws back under the action of the main diaphragm, the piston block is driven to reciprocate in the piston cavity, the telescopic rod is driven to move up and down, the fluctuation range of the air pressure at the outlet end is calculated by observing the up and down movement amplitude of the telescopic rod, namely the movement amplitude of the telescopic rod is in a certain section of interval of the scale mark, the larger the interval range of the movement amplitude of the telescopic rod is, the larger the fluctuation range of the air pressure at the outlet end is indicated, then the input air pressure is regulated until the movement amplitude of the telescopic rod is stabilized in a certain section of interval, the regulation of the air pressure at the outlet end is completed, the scale mark on the telescopic rod is used as a measurement standard, the fluctuation range of the air pressure at the outlet end can be intuitively known, and the air pressure regulation precision is improved.
3. The telescopic link upper end is provided with the trigger piece, and piston chamber top is provided with the trigger switch that is located under the trigger piece, and trigger switch electric connection has the siren that sets up at the valve body outer wall, and when the telescopic link reciprocates the range too big, makes the trigger piece contact trigger switch, and trigger switch sends out the signal and makes the siren send out the suggestion sound, and the fluctuation range that indicates exit end atmospheric pressure promptly is too big, has surpassed the safe value that the valve body bore, and the pressure value that needs the regulation input atmospheric pressure at this moment reaches the safe value, has improved valve body life.
4. The two ends of the signal feedback tube are respectively connected between the outlet end and the bottom of the balance cavity through connecting screws, so that the signal feedback tubes with different tube diameters can be replaced according to actual demands, and the operation is convenient.
5. The balance cavity is enclosed by two detachably connected shells, and the balance cavity is in an ellipsoidal shape, so that the shell enclosing the balance cavity can be detached, the maintenance and replacement of internal parts are facilitated, meanwhile, the ellipsoidal balance cavity can avoid too disperse airflow transmitted from the signal feedback tube, has a certain guiding effect on the airflow, and improves the air pressure signal feedback sensitivity.
Drawings
FIG. 1 is a schematic diagram of a pressure reducing valve feedback gas balancer according to the present invention;
fig. 2 is a partially enlarged schematic structural view at a in fig. 1.
Reference numerals: the valve comprises a valve body 1, a valve inlet 2, a valve outlet 3, a gas delivery cavity 4, a balancing cavity 5, a signal feedback pipe 6, a main membrane 7, a valve rod 8, a balancing spring 9, a valve port 10, a valve clack 11, a piston cavity 12, a piston block 13, a telescopic rod 14, a scale mark 14.1, a trigger block 15, a trigger switch 16, a warning device 17, a ring valve sleeve 18, a buffer hole 19, a buffer spring 20, a push rod 21 and a steel ball 22.
Detailed Description
For a better understanding of the present invention, reference is made to the following description of the invention, taken in conjunction with the accompanying drawings and the following examples.
Example 1
As shown in fig. 1 to 2, the embodiment provides a pressure reducing valve feedback gas balancer, which comprises a valve body 1, and comprises a valve body 1, wherein two ends of the valve body 1 are respectively provided with an inlet end 2 and an outlet end 3, a gas conveying cavity 4 positioned between the inlet end 2 and the outlet end 3 is arranged in the valve body 1, a valve port 10 is arranged in the gas conveying cavity 4, a valve rod 8 capable of moving up and down in the valve port 10 is arranged in the gas conveying cavity 4, a valve clack 11 positioned below the valve port 10 is connected to the bottom of the valve rod 8, an annular valve sleeve 18 matched with the valve clack 11 is arranged in the valve port 10, the valve rod 8 penetrates through the annular valve sleeve 18, at least two uniformly distributed buffer holes 19 are formed in the bottom of the annular valve sleeve 18, buffer springs 20 are connected to the inner tops of the buffer holes 19, ejector rods 21 matched with the buffer holes 19 are connected to the other ends of the buffer springs 20, and a plurality of steel balls 22 positioned right below the corresponding ejector rods 21 are embedded on the upper surface of the valve clack 11.
In this embodiment, when the air pressure fluctuation is great, the valve rod drives the valve clack to move upwards to be close to the valve port, at this moment, steel balls on the valve clack are close to the ejector rod on the annular valve sleeve located at the valve port at first, the ejector rod stretches into the buffer hole and extrudes the buffer spring, thereby reducing the upward moving speed of the valve clack, enabling the valve clack and the valve rod to slowly and stably come down, changing the traditional direct surface-to-surface contact by adopting the point-to-surface contact between the steel balls and the ejector rod, avoiding the direct contact of the valve clack and the annular valve sleeve, reducing severe vibration, preventing damage to the internal components of the valve body, ensuring the use safety, and prolonging the service cycle of the valve body.
Example 2
As shown in fig. 1, this embodiment is further optimized based on embodiment 1, specifically, two ends of the valve body 1 are respectively provided with an inlet end 2 and an outlet end 3, a gas conveying cavity 4 which is communicated with the inlet end 2 and the outlet end 3 is arranged in the valve body 1, a balance cavity 5 which is positioned above the gas conveying cavity 4 is arranged in the valve body 1, a signal feedback tube 6 is arranged between the outlet end 3 and the bottom of the balance cavity 5, a main diaphragm 7 with elasticity is arranged in the balance cavity 5, two ends of the main diaphragm 7 are fixed at the side end of the balance cavity 5, a valve rod 8 penetrates through the main diaphragm 7, the top of the valve rod 8 is connected with a balance spring 9 which is in contact with the upper surface of the main diaphragm 7, a piston cavity 12 which is positioned at the top of the balance cavity 5 is arranged in the valve body 1, a piston block 13 which can slide up and down in the piston cavity 12 is connected with a telescopic rod 14 which stretches out of the piston cavity 12, and a plurality of graduation marks 14.1 are uniformly distributed on the telescopic rod 14.
In this embodiment, when the air pressure transferred to the balance cavity through the signal feedback tube acts on the main diaphragm, the main diaphragm swings up and down, and meanwhile, the main diaphragm applies an acting force to the balance spring, so that the balance spring drives the valve rod to move up and down, and meanwhile, the balance spring continuously stretches under the action of the main diaphragm, so as to drive the piston block to reciprocate in the piston cavity, and further drive the telescopic rod to move up and down, and the fluctuation range of the air pressure at the outlet end is obtained by observing the up and down movement amplitude of the telescopic rod, namely, the movement amplitude of the telescopic rod is in a certain section of interval of the scale mark, and the larger the section of the movement amplitude of the telescopic rod is, the larger the fluctuation range of the air pressure at the outlet end is indicated, then the input air pressure is regulated until the movement amplitude of the telescopic rod is stabilized in a certain section of the interval, and the regulation of the air pressure at the outlet end is completed, and the scale mark on the telescopic rod is used as a measurement standard, so that the fluctuation range of the air pressure regulating precision at the outlet end can be intuitively known.
Example 3
As shown in fig. 1, this embodiment is further optimized based on embodiment 2, specifically, a trigger block 15 is disposed at the upper end of the telescopic rod 14, a trigger switch 16 located right below the trigger block 15 is disposed at the top outside the piston cavity 12, and the trigger switch 16 is electrically connected with an alarm 17 disposed on the outer wall of the valve body 1.
In this embodiment, when the up-and-down movement range of the telescopic rod is too large, the trigger block is made to contact with the trigger switch, and the trigger switch sends out a signal to make the alarm send out a prompt sound, that is, the fluctuation range of the air pressure at the outlet end is too large, and exceeds the safety value born by the valve body, at this time, the pressure value of the input air pressure needs to be adjusted to reach the safety value, and the service life of the valve body is prolonged.
Example 4
As shown in fig. 1, this embodiment is further optimized based on embodiment 2, specifically, two ends of the signal feedback tube 6 are respectively connected between the outlet end 3 and the bottom of the balancing cavity 5 through connecting screws.
In this embodiment, set up the signal feedback pipe detachable, can change the signal feedback pipe of different pipe diameters according to actual demand, convenient operation.
Example 5
As shown in fig. 1, this embodiment is further optimized based on embodiment 1, specifically, the balance cavity 5 is surrounded by two detachably connected shells, and the balance cavity 5 is overall ellipsoidal.
In this embodiment, can unpack apart the casing that encloses into balance chamber, make things convenient for maintenance and change inside spare part, the ellipsoidal balance chamber can avoid the air current that comes from signal feedback pipe transmission too dispersedly simultaneously, has certain guide effect to the air current, improves atmospheric pressure signal feedback sensitivity.
Working principle: when the pressure reducing valve works, the outlet end of the pressure reducing valve starts to convey gas to the downstream, the pressure of the outlet end is suddenly reduced, the pressure of the air pressure acting on the main diaphragm is smaller than the elastic force of the balance spring through the transmission of the signal feedback tube, the valve rod moves downwards under the action of the spring force, the valve clack is separated from the valve port, the pressure of the outlet end is gradually increased, when the high-pressure gas of the inlet end is conveyed to the outlet end, the pressure of the outlet end is instantaneously increased, the increased gas is conveyed to the lower cavity of the balance cavity through the signal feedback tube, the pressure of the air pressure acting on the main diaphragm is larger than the elastic force of the balance spring, the main diaphragm swings upwards, so that the balance spring drives the valve rod to move upwards, the distance between the valve port and the valve clack is reduced, the pressure of the outlet end starts to be reduced again, and a periodical circulation process is formed, and the pressure of the outlet end periodically fluctuates within a certain range. When the pressure reducing valve does not work, under the action of air pressure at the outlet end, the valve clack and the valve port are in a completely closed state, and the pressure at the outlet end is stabilized at a set value.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The utility model provides a relief pressure valve feedback gas balancer, including valve body (1), valve body (1) both ends are provided with entrance end (2) and exit end (3) respectively, be provided with in valve body (1) and be located gas delivery chamber (4) between entrance end (2) and exit end (3), be provided with valve port (10) in gas delivery chamber (4), be provided with valve rod (8) that can reciprocate in valve port (10) in gas delivery chamber (4), valve rod (8) bottom is connected with valve clack (11) that are located valve port (10) below, characterized in that, be provided with annular valve pocket (18) with valve clack (11) complex in valve port (10), valve rod (8) pass annular valve pocket (18), at least two equipartition buffer holes (19) have been seted up to annular valve pocket (18) bottom, buffer spring (20) are all connected with at the top in buffer hole (19), the buffer spring (20) other end all is connected with ejector pin (21) with buffer hole (19) complex, valve clack (11) upper surface inlay have a plurality of steel balls (22) that are located under corresponding ejector pin (21);
a balance cavity (5) positioned above the gas conveying cavity (4) is arranged in the valve body (1), a signal feedback tube (6) is arranged between the outlet end (3) and the bottom of the balance cavity (5), a main diaphragm (7) with elasticity is arranged in the balance cavity (5), two ends of the main diaphragm (7) are fixed at the side end of the balance cavity (5), a valve rod (8) penetrates through the main diaphragm (7), a piston cavity (12) positioned at the top of the balance cavity (5) is arranged in the valve body (1), a balance spring (9) is arranged in the piston cavity (12), the bottom of the balance spring (9) is in contact with the upper surface of the main diaphragm (7), a piston block (13) capable of sliding up and down in the piston cavity (12) is connected to the top of the balance spring (9), and a plurality of scale marks (14.1) are uniformly distributed on the telescopic rod (14);
the upper end of the telescopic rod (14) is provided with a trigger block (15), the outer top of the piston cavity (12) is provided with a trigger switch (16) positioned under the trigger block (15), and the trigger switch (16) is electrically connected with an alarm (17) arranged on the outer wall of the valve body (1);
two ends of the signal feedback tube (6) are respectively connected between the outlet end (3) and the bottom of the balance cavity (5) through connecting screws.
2. A pressure reducing valve feedback gas balancer according to claim 1, characterized in that the balancing chamber (5) is enclosed by two detachably connected housings, the balancing chamber (5) being generally ellipsoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810984505.4A CN108799583B (en) | 2018-08-27 | 2018-08-27 | Pressure reducing valve feedback gas balancer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810984505.4A CN108799583B (en) | 2018-08-27 | 2018-08-27 | Pressure reducing valve feedback gas balancer |
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| Publication Number | Publication Date |
|---|---|
| CN108799583A CN108799583A (en) | 2018-11-13 |
| CN108799583B true CN108799583B (en) | 2024-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810984505.4A Active CN108799583B (en) | 2018-08-27 | 2018-08-27 | Pressure reducing valve feedback gas balancer |
Country Status (1)
| Country | Link |
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| CN (1) | CN108799583B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109538565B (en) * | 2018-11-29 | 2020-08-14 | 河南航天液压气动技术有限公司 | Combined valve |
| CN109758624B (en) * | 2018-12-30 | 2022-07-01 | 捷锐企业(上海)有限公司 | High-reliability negative pressure regulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0266007A2 (en) * | 1986-10-28 | 1988-05-04 | T L V Co., Ltd. | Piston restraining construction of pressure reducing valve |
| CN202149260U (en) * | 2011-08-02 | 2012-02-22 | 欧特莱能源装备有限公司 | Fuel gas pressure regulator |
| CN203214990U (en) * | 2013-04-18 | 2013-09-25 | 上海艾维科阀门有限公司 | Pressure reducing valve for nuclear power water system |
| CN203286072U (en) * | 2013-05-25 | 2013-11-13 | 铜陵市三圆特种铸造有限责任公司 | Modularized valve plug structure for high-flow balanced pressure regulating valve |
| CN103542150A (en) * | 2013-10-30 | 2014-01-29 | 杭州春江阀门有限公司 | Pressure reducing valve with valve closing function |
| CN205298643U (en) * | 2016-01-08 | 2016-06-08 | 志远科技有限公司 | Pressure reducing valve |
| CN207145657U (en) * | 2017-09-21 | 2018-03-27 | 河北永良燃气设备有限公司 | A kind of gas pressure regulator, governor |
| CN208719492U (en) * | 2018-08-27 | 2019-04-09 | 成都川力智能流体设备股份有限公司 | A kind of pressure reducing valve feedback gas balancer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016011951A1 (en) * | 2014-07-22 | 2016-01-28 | 费希尔久安输配设备(成都)有限公司 | Balanced valve element and pressure regulating valve |
-
2018
- 2018-08-27 CN CN201810984505.4A patent/CN108799583B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0266007A2 (en) * | 1986-10-28 | 1988-05-04 | T L V Co., Ltd. | Piston restraining construction of pressure reducing valve |
| CN202149260U (en) * | 2011-08-02 | 2012-02-22 | 欧特莱能源装备有限公司 | Fuel gas pressure regulator |
| CN203214990U (en) * | 2013-04-18 | 2013-09-25 | 上海艾维科阀门有限公司 | Pressure reducing valve for nuclear power water system |
| CN203286072U (en) * | 2013-05-25 | 2013-11-13 | 铜陵市三圆特种铸造有限责任公司 | Modularized valve plug structure for high-flow balanced pressure regulating valve |
| CN103542150A (en) * | 2013-10-30 | 2014-01-29 | 杭州春江阀门有限公司 | Pressure reducing valve with valve closing function |
| CN205298643U (en) * | 2016-01-08 | 2016-06-08 | 志远科技有限公司 | Pressure reducing valve |
| CN207145657U (en) * | 2017-09-21 | 2018-03-27 | 河北永良燃气设备有限公司 | A kind of gas pressure regulator, governor |
| CN208719492U (en) * | 2018-08-27 | 2019-04-09 | 成都川力智能流体设备股份有限公司 | A kind of pressure reducing valve feedback gas balancer |
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| CN108799583A (en) | 2018-11-13 |
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