CN113944767B - Liquid outlet stop valve for gas system and gas supply system - Google Patents
Liquid outlet stop valve for gas system and gas supply system Download PDFInfo
- Publication number
- CN113944767B CN113944767B CN202111278991.6A CN202111278991A CN113944767B CN 113944767 B CN113944767 B CN 113944767B CN 202111278991 A CN202111278991 A CN 202111278991A CN 113944767 B CN113944767 B CN 113944767B
- Authority
- CN
- China
- Prior art keywords
- valve
- valve core
- core
- liquid outlet
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 71
- 230000000903 blocking effect Effects 0.000 claims description 22
- 230000005484 gravity Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 12
- 238000009434 installation Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 52
- 230000009471 action Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 239000002737 fuel gas Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000945 filler Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/52—Means for additional adjustment of the rate of flow
- F16K1/526—Means for additional adjustment of the rate of flow for limiting the maximum flow rate, using a second valve
-
- 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
-
- 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
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/10—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid with additional mechanism between armature and closure member
-
- 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
-
- 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
- F16K35/00—Means to prevent accidental or unauthorised actuation
- F16K35/10—Means to prevent accidental or unauthorised actuation with locking caps or locking bars
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0165—Applications for fluid transport or storage on the road
- F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
- F17C2270/0178—Cars
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The application relates to a liquid outlet stop valve for a gas system and a gas supply system, which comprise a valve body, wherein a valve cavity is arranged in the valve body, and two ends of the valve cavity are respectively provided with a liquid inlet and a liquid outlet at two ends of the valve body; the first valve core is movably arranged in the valve cavity; an operation part which is arranged on the outer wall of the valve body and is connected with the first valve core; the electric control assembly is connected with the first valve core; the second valve core is movably arranged in the valve cavity at one side of the first valve core and is connected with the first valve core through an elastic piece, and the elastic piece and the second valve core are configured to drive the second valve core to block or communicate with the valve cavity according to the pressure difference between the space at the second valve core and the external space communicated with the liquid outlet. The liquid outlet stop valve provided by the scheme is faster, simpler and larger in use and has larger operation space to cope with different operation demands under lower structure and installation cost, and has obvious practical use effect.
Description
Technical Field
The application relates to the technical field of fuel gas supply, in particular to a liquid outlet stop valve for a fuel gas system and a fuel gas supply system.
Background
At present, when a user in an LNG gas vehicle performs operation control on an LNG gas system, a driver manually rotates a liquid outlet stop valve, a booster valve and a vent valve to control gas supply, and meanwhile, in the existing pipeline, in order to prevent leakage of the pipeline, an overcurrent protection valve is further arranged behind the liquid outlet valve. But the overflow valve is connected in the pipeline by welding or threads, so that the manufacturing process is complex and the cost is high.
Disclosure of Invention
The embodiment of the application provides a liquid outlet stop valve for a gas system and a gas supply system, which are used for solving the problems of complex structure, high production and installation cost and inconvenient use of a gas system pipeline valve in the related art.
In a first aspect, a liquid outlet stop valve for a gas system is provided, and the following technical scheme is adopted:
a liquid outlet shutoff valve for a gas system, comprising:
the valve body is internally provided with a valve cavity, and two ends of the valve cavity are respectively provided with a liquid inlet and a liquid outlet at two ends of the valve body;
the first valve core is movably arranged in the valve cavity so as to block or communicate with the valve cavity when the first valve core moves;
the operating part is arranged on the outer wall of the valve body and connected with the first valve core so as to drive the first valve core to move when the operating part moves;
the electric control assembly is connected with the first valve core and used for driving the first valve core to block or communicate with the valve cavity;
the second valve core is movably arranged in the valve cavity at one side of the first valve core, is connected with the first valve core through an elastic piece, and is configured with the second valve core to drive the second valve core to block or communicate with the valve cavity according to the pressure difference between the space at the second valve core and the external space communicated with the liquid outlet.
Through the scheme, the first valve core is connected with the operation part and the electric control assembly outside the valve body, so that the liquid outlet stop valve provided by the scheme can be used for remotely controlling the opening and closing of the valve body through the electric control assembly during normal use, the situation that an operator has to operate manually is avoided, and meanwhile, under special conditions, the operator can also control the first valve core through the operation part to control the opening and closing of the valve body, so that the liquid outlet stop valve can be used smoothly under more complex conditions;
meanwhile, the second valve core and the elastic piece arranged on the second valve core are used for monitoring the pressure difference between the inside and the outside of the valve cavity, when the pressure difference between the second valve core and the elastic piece is large, namely, when the follow-up pipeline is likely to leak fuel gas, the second valve core moves to the side with smaller pressure and drives the elastic piece to extend until the valve is closed, when the pressure difference between the inside and the outside of the valve body is small, the second valve core can move under the elastic reset action of the elastic piece and open the valve, so that the fuel gas supply is effectively ensured to be in a safe state, the substitution of the overflow valve is realized, and meanwhile, the structure and the connection mode of the valve are simpler compared with those of the overflow valve, so that the scheme has lower manufacturing and installation cost;
in addition, because the second valve core is connected with the first valve core, when needed, an operator can drive the first valve core to move through the operation part or the electric control assembly and simultaneously drive the second valve core, the position of the second valve core is manually controlled, whether the second valve core blocks the valve cavity can be controlled according to actual conditions, and finally, the liquid outlet stop valve provided by the scheme has a larger operation space and obvious actual use effect when in use.
In some embodiments, the first valve element is at least movable in the valve cavity to a first position, a second position, and a third position in sequence, the first position, the second position, and the third position being configured to:
when the first valve core is in the first position, the first valve core blocks the valve cavity;
when the first valve core is positioned at the second position, the valve cavities at two sides of the first valve core are communicated;
when the first valve core is positioned at the third position, the second valve core and the elastic piece are always positioned in a position area communicated with the valve cavity.
Through the scheme, when the first valve core can move between the first position and the second position, the second valve core and the elastic piece can smoothly block and close the valve cavity when the pressure difference is large according to the internal and external pressure difference of the valve body, the valve body provided by the scheme can effectively guarantee the safety effect under the normal use condition, meanwhile, the first valve core can always avoid the second valve core to block the valve cavity after moving to the third position, and the valve can be applied to forcibly resetting the second valve core after an operator eliminates the possibility of leakage of an external pipeline of the valve body without closing the first valve core or other front valves, so that gas can be quickly recovered.
In some embodiments, the electronic control assembly may drive at least the first valve spool to the first position and the second position; the operating portion may drive the first spool to the first position, the second position, and the third position.
Through the scheme, whether the first valve core can be controlled by the electric control assembly to block the valve cavity is realized, the opening and closing of the liquid outlet stop valve can be controlled by the electric control assembly in a long distance under the normal condition, the operation part can control whether the first valve core blocks the valve cavity and can forcedly control the second valve core, and an operator can safely recover the air supply by using the operation part after the fault condition is eliminated.
In some embodiments, the gas system is configured when installed for use with a liquid outlet shutoff valve,
the first valve core can move to the first position through self gravity;
the electric control assembly can drive the first valve core to move to the second position at least;
the operating part can drive the first valve core to move to the second position and the third position.
Through above-mentioned scheme, realize that first case can realize blocking the valve pocket and close the valve body under the dead weight effect, and then guarantee under the daily use and the condition that does not open automatically controlled subassembly, the play liquid stop valve that this scheme provided can be automatic and continuously be in the closed state, improves the use convenience of this device.
In some embodiments, the electronic control assembly is a solenoid valve disposed outside the valve body, and the solenoid valve is configured to drive the first valve element to move to the second position when the solenoid valve is powered.
Through above-mentioned scheme, automatically controlled subassembly adopts electromagnetic valve spare and only needs to produce the magnetism after connecing the electricity with first case by first position drive to the second position, and then its electric current that only needs switch on fixed intensity when needs can realize relevant function, simple structure easily realizes, and follow-up connection lays and all can go on smoothly swift.
In some embodiments, a locking member is further disposed on the valve body, and the locking member is at least detachably connected to the first valve core in the first position and fixes the first valve core.
Through the scheme, when the air supply system is required to be closed for a long time, the first valve core can be fixed to the first position by means of the locking piece, so that the valve body is ensured to be in a closed state stably in the process, and the possibility of opening the valve body due to faults is reduced.
In some embodiments, a first plug is disposed in the valve cavity, and the first valve core includes:
one end of the valve rod penetrates into the valve cavity, the other end of the valve rod is connected with the operating part and the electric control assembly outside the valve cavity, and the elastic piece is connected with the outer wall of the valve rod;
the first core body is arranged on the valve rod, positioned in the valve cavity and capable of moving to seal the first sealing opening along with the valve rod.
Through the scheme, when the first valve core moves in the valve cavity through the valve rod, the first core on the valve rod is matched with the first plugging opening of the valve cavity, so that the valve body can be opened and closed after the first plugging opening is plugged, the sectional area of the valve cavity is effectively controlled to be blocked by plugging of the first valve core, and the valve body can be closed rapidly and stably.
In some embodiments, a locking rod is threaded on the valve body, and one end of the locking rod extends to the valve cavity and can be fixedly threaded on the end of the valve rod.
Through the scheme, the end part of the locking rod in the valve cavity can be in threaded fit with the end part of the valve rod by rotating the locking rod, and the valve rod cannot move in the axial direction at will at the moment due to the threaded fit of the locking rod and the valve body, so that the valve body can be continuously and stably in a closed state when the locking rod is not separated from the valve rod.
In some embodiments, a second blocking opening with a circular cross section is arranged in the valve cavity, and the second valve core is a sphere capable of blocking the second blocking opening when moving to the second blocking opening.
Through the scheme, the second port and the second valve core are matched and plugged at a specific angle relative to the second port and the second valve core which are required to be plugged in other shapes, the second valve core of the sphere can quickly and accurately plug the second port when moving to the circular second port, and the stability and the opening and closing speed of the second valve core in use are improved.
In a second aspect, a gas supply system is provided, and the following technical scheme is adopted:
a gas supply system, comprising:
a compressed gas cylinder;
the liquid outlet stop valve for the gas system is characterized in that the liquid inlet is connected with the compressed gas cylinder through a conveying pipeline, and the liquid outlet is connected with a gas supply pipeline.
Through above-mentioned scheme, the compressed gas bottle can be under the play liquid stop valve effect can the discharge of remote control gas, need not to go out opening and close of liquid stop valve through operating personnel manual control when normal use, simultaneously when gas supply pipeline and its subsequent structure appear revealing the condition, this gas supply system can effectively stop to gas supply pipeline air feed through going out the liquid stop valve, has higher security, and under special circumstances, the accessible manual operation goes out liquid stop valve and makes it realize functions such as continuously closing or forced opening, has apparent practical application meaning.
The technical scheme provided by the application has the beneficial effects that:
the embodiment of the application provides a liquid outlet stop valve for a gas system and a gas supply system, wherein an operation part and an electric control assembly are connected outside a valve body of a first valve core;
meanwhile, the second valve core and the elastic piece arranged on the second valve core are used for monitoring the pressure difference between the inside and the outside of the valve cavity, when the pressure difference between the second valve core and the elastic piece is large, namely, when the follow-up pipeline is likely to leak fuel gas, the second valve core moves to the side with smaller pressure and drives the elastic piece to extend until the valve is closed, when the pressure difference between the inside and the outside of the valve body is small, the second valve core can move under the elastic reset action of the elastic piece and open the valve, so that the fuel gas supply is effectively ensured to be in a safe state, the substitution of the overflow valve is realized, and meanwhile, the structure and the connection mode of the valve are simpler compared with those of the overflow valve, so that the scheme has lower manufacturing and installation cost;
in addition, because the second valve core is connected with the first valve core, when the valve is needed, an operator can drive the second valve core to move while driving the first valve core to move through the operation part or the electric control assembly, and the position of the second valve core is manually controlled, so that whether the second valve core blocks the valve cavity or not can be controlled according to actual conditions.
Finally, the liquid outlet stop valve provided by the scheme is quicker, simpler and larger in use and has larger operation space to cope with different operation demands under the lower structure and installation cost, and has obvious practical use effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an overall structure according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a first valve core provided in an embodiment of the present application in a first position state;
FIG. 3 is a schematic diagram of a first valve core provided in an embodiment of the present application in a second position state (balanced differential pressure between the inside and the outside of the valve body);
FIG. 4 is a schematic diagram of a first valve core provided in an embodiment of the present application in a second position state (the pressure difference outside the pressure in the valve body is too large);
fig. 5 is a schematic diagram of the first valve core provided in the embodiment of the present application in the third position state (the pressure difference outside the pressure in the valve body is too large).
In the figure:
1. a valve body; 10. a valve cavity; 11. a liquid inlet; 12. a liquid outlet; 13. a first plugging port; 14. a second plugging port;
2. a first valve core; 20. a valve stem; 21. a first core;
3. an operation unit;
4. an electrical control assembly;
5. a second valve core; 50. an elastic member;
60. a locking lever.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application provides a liquid outlet stop valve for a gas system and a gas supply system, which can solve the problems of complex structure, high production and installation cost and inconvenient use of a gas system pipeline valve in the related art.
In a first aspect, the embodiment of the application provides a liquid outlet stop valve for a gas system, so as to solve the problems of inconvenient use of the liquid outlet stop valve and higher cost of an overflow valve.
Referring to fig. 1, a liquid outlet shutoff valve for a gas system includes:
the valve body 1 is provided with a valve cavity 10 therein, and two ends of the valve cavity 10 are respectively provided with a liquid inlet 11 and a liquid outlet 12 at two ends of the valve body 1;
the first valve core 2 is movably arranged in the valve cavity 10 so as to block or communicate with the valve cavity 10 when the first valve core moves;
an operation part 3 which is provided on the outer wall of the valve body 1 and is connected to the first valve element 2 so as to drive the first valve element 2 to move when the operation part moves;
an electric control assembly 4 connected with the first valve core 2 for driving the first valve core 2 to block or communicate with the valve cavity 10;
the second valve core 5 is movably arranged in the valve cavity 10 at one side of the first valve core 2, and is connected with the first valve core 2 through an elastic piece 50, and the elastic piece 50 and the second valve core 5 are configured to drive the second valve core 5 to block or communicate with the valve cavity 10 according to the pressure difference between the space at the second valve core 5 and the external space communicated with the liquid outlet 12.
The operation part 3 can be manually controlled or remotely controlled as required, so as to reduce the structural cost and ensure the safety of the valve body 1, and the operation part 3 in this embodiment is an operation end which needs to be manually operated by an operator, so that the operator can manually control the device through the operation part 3 when necessary. In other embodiments, other control or driving modes may be selected as the operation portion 3 as needed.
In this embodiment, the elastic member 50 is a compression spring connecting the first valve core 2 and the second valve core 5, and when the valve body 1 is opened but the pressure difference in the external pipe connected to the liquid outlet 12 in the valve body 1 is large, the pressure formed by the pressure difference between the inside and the outside overcomes the elastic force of the compression spring to drive the second valve core 5 to move toward the liquid outlet 12, so that the second valve core 5 can finally move to block the valve cavity 10 to close the valve body 1.
The first valve core 2 is connected with the operation part 3 and the electric control component 4 outside the valve body 1, so that the liquid outlet stop valve provided by the scheme can remotely control the opening and closing of the valve body 1 through the electric control component 4 during normal use, the situation that an operator has to operate manually is avoided, and meanwhile, under special conditions, the operator can also control the first valve core 2 through the operation part 3 to control the opening and closing of the valve body 1, so that the liquid outlet stop valve can still be used smoothly under more complicated conditions;
referring to fig. 3 and fig. 4, simultaneously, the second valve core 5 and the elastic member 50 arranged on the second valve core 5 are arranged in the valve cavity 10, so that the pressure difference between the inside and the outside of the valve cavity 10 is monitored, when the pressure difference between the second valve core 5 and the elastic member is large, namely, when the subsequent pipeline possibly leaks gas, the second valve core 5 moves to the side with smaller pressure and drives the elastic member 50 to extend until the valve is closed, when the pressure difference between the inside and the outside of the valve body 1 is small, the second valve core 5 can move under the action of elastic reset of the elastic member 50 and open the valve, the gas supply is effectively ensured to be in a safe state, the substitution of the overcurrent valve is realized, and meanwhile, the structure and the connection mode of the valve are simpler compared with those of the overcurrent valve, so that the scheme has lower manufacturing and installation cost;
in addition, because the second valve core 5 is connected with the first valve core 2, when needed, an operator can drive the second valve core 5 when driving the first valve core 2 to move through the operation part 3 or the electric control assembly 4, the position of the second valve core 5 is manually controlled, whether the second valve core 5 blocks the valve cavity 10 can be controlled according to actual conditions, and finally, the liquid outlet stop valve provided by the scheme has a larger operation space and obvious actual use effect when in use.
Optionally, the first valve element 2 is at least sequentially movable in the valve cavity 10 to a first position, a second position and a third position, where the first position, the second position and the third position are respectively configured to:
referring to fig. 2, when the first spool 2 is in the first position, it blocks the valve chamber 10;
referring to fig. 3 or 4, when the first valve element 2 is at the second position, the valve chambers 10 on both sides of the first valve element 2 are communicated;
referring to fig. 5, when the first spool 2 is in the third position, the second spool 5 and the elastic member 50 are always in a position region where the valve chamber 10 communicates.
The first position is a position point when the first valve core 2 seals the valve cavity 10, the second position and the third position are certain position points in the position area of the first valve core 2 meeting the respective configuration effects, and it can be understood that the second position and the third position are any point in the position area meeting the respective required configuration effects.
The arrangement is that when the first valve core 2 can move between the first position and the second position, the second valve core 5 and the elastic piece 50 can smoothly realize blocking and closing of the valve cavity 10 when the pressure difference is larger according to the internal and external pressure difference of the valve body 1, so that the valve body 1 provided by the scheme can effectively ensure the safety effect under the normal use condition, meanwhile, the first valve core 2 can always avoid the second valve core 5 to block the valve cavity 10 after moving to the third position, and the valve can be applied to forcibly reset the second valve core 5 after an operator eliminates the possibility of leakage of an external pipeline of the valve body 1 without closing the first valve core 2 or other front valves, so that gas can be quickly recovered to supply
Optionally, the electronic control assembly 4 may drive at least the first valve element 2 to the first position and the second position; the operation portion 3 may drive the first spool 2 to the first position, the second position, and the third position.
In this embodiment, the electronic control assembly 4 can only drive the first valve element 2 from the first position to the second position, but cannot drive the first valve element 2 to move to the third position.
The arrangement realizes that the electric control assembly 4 can control whether the first valve core 2 blocks the valve cavity 10, ensures that the electric control assembly 4 can remotely control the opening and closing of the liquid outlet stop valve under normal conditions, and the operating part 3 can control whether the first valve core 2 blocks the valve cavity 10 and forcibly control the second valve core 5, so that an operator can utilize the operating part 3 to safely recover the air supply after the fault condition is eliminated.
Optionally, the gas system is configured when installed and used with a liquid outlet stop valve,
the first valve core 2 can move to the first position through self gravity;
the electric control assembly 4 can drive the first valve core 2 to move to the second position at least;
the operation part 3 can drive the first valve core 2 to move to the second position and the third position.
In this embodiment, the first valve core 2 is slidably disposed in the valve body 1, and when the device is used, it is required to satisfy that the first valve core 2 is vertically disposed, so that the first valve core can move under the action of its own gravity and block the valve cavity 10.
The setting like this realizes that first case 2 can realize blocking valve pocket 10 and close valve body 1 under the dead weight effect, and then the guarantee is daily to use and under the condition that does not open automatically controlled subassembly 4, and the play liquid stop valve that this scheme provided can be automatic and continuously be in the closed condition, improves the use convenience of this device.
Optionally, the electric control component 4 is a solenoid valve disposed outside the valve body 1, and the solenoid valve is configured to drive the first valve core 2 to move to the second position when power is connected.
The setting like this, automatically controlled subassembly 4 adopts electromagnetic valve spare and only needs to produce the magnetism after connecing the electricity with first case 2 by first position drive to the second position, and then its electric current that only needs switch on fixed intensity when needs can realize relevant function, simple structure easily realizes, and follow-up connection lay all can be smooth swift going on.
Referring to fig. 1, optionally, a locking member is further provided on the valve body 1, and the locking member is at least detachably connected to the first valve core 2 in the first position and fixes the first valve core 2.
In this embodiment, the locking member may be connected and fixed with the first valve core 2 at the first position only, and in other embodiments, the locking member may be connected with the first valve core 2 at the second position or the third position as required, so as to achieve different functional effects.
In this way, under the condition that the absolute closure of the valve body needs to be ensured, if the air supply system needs to be closed for a long time, the first valve core 2 can be fixed to the first position by means of the locking piece, so that the valve body 1 is ensured to be in a closed state stably in the process, and the possibility of opening the valve body 1 caused by faults is reduced.
Referring to fig. 1, optionally, a first plug 13 is disposed in the valve cavity 10, and the first valve core 2 includes:
a valve rod 20, one end of which is inserted into the valve cavity 10, the other end of which is connected with the operating part 3 and the electric control assembly 4 outside the valve cavity 10, and the elastic member 50 is connected with the outer wall of the valve rod 20;
a first core 21 is provided on the valve stem 20 and located in the valve chamber 10, and is movable to close the first closure opening 13 following the valve stem 20.
The valve rod 20 is axially slidably disposed on the valve body 1, and the sliding axial direction of the valve rod is in the same axial direction as the first plugging opening 13, so that the valve rod 20 can drive the first core 21 thereon to approach or separate from the first plugging opening 13. The area of the first blocking opening 13 is smaller than the sectional area of the first core 21 in the axial direction of the first blocking opening 13, so that the first core 21 can be blocked after contacting and abutting the first blocking opening 13.
The operating part 3 is an operating handle mounted on the outer end of the valve rod 20 at the outer end of the valve body 1, so that the operating handle can drive the valve rod 20 to move in the direction of pulling out the valve body 1. The electric control assembly 4 is disposed outside the valve rod 20 between the operating handle and the valve body 1, so as to drive the valve rod 20 outwards from the valve body 1 after power connection, and drive the first core 21 to be far away from the first plugging port 13.
And when the liquid outlet stop valve provided by the embodiment is installed and used, the valve rod 20 is vertically arranged and positioned at the top of the liquid outlet stop valve, so that the liquid outlet stop valve can move to the first core 21 to block the first blocking opening 13 under the action of self gravity.
In addition, the electromagnetic valve member as the electric control assembly is connected to the outer end of the valve rod at the outer end of the valve cavity, and the valve rod 20 is provided with a metal pushing block matched with the electromagnetic valve member on the outer side of the valve body 1 for being matched with electromagnetic filler in the electromagnetic valve member, so that the metal pushing block can be driven to be far away after the electromagnetic filler is powered, the valve rod 20 can be magnetically driven to move after the electromagnetic filler is powered, and the first core 21 is controlled to not block the valve cavity 10.
The valve rod 20 moves in the valve cavity 10, and the first core 21 on the valve rod 20 is matched with the first plugging port 13 of the valve cavity 10, so that the valve body 1 can be opened and closed after the first core 21 moves to plug the first plugging port 13, the cross section area of the valve cavity 10, which is required to be plugged by the first valve core 2, is effectively controlled, and the valve body 1 can be closed rapidly and stably by the first valve core 2.
Optionally, a second blocking opening 14 is provided in the valve cavity 10, and the second valve core 5 is connected to an end of the elastic member away from the valve rod 20, and can block the second blocking opening 14 when moving to the second blocking opening 14.
Referring to fig. 1, further, the second plugging port 14 has a circular cross section, and the second valve element 5 is a sphere that can plug the second plugging port 14 when moving to the second plugging port 14.
In this embodiment, the second plug 14 and the second valve core 5 are respectively selected from a circular shape and a spherical shape, and in other embodiments, the second plug 5 may be selected from other shapes and structures capable of sealing the second plug 14.
The setting like this, when other shapes, need second shutoff mouth 14 to carry out the cooperation shutoff with second case 5 with specific angle, spheroid second case 5 can be swiftly accurate when removing to circular shape second shutoff mouth 14 to the shutoff of second ferry, improves stability and the opening and closing speed when using of second case 5.
Furthermore, the elastic piece 50 is utilized to monitor the pressure difference between the inside and the outside of the valve cavity 10, when the pressure difference between the two is large, namely, when the gas leakage possibly occurs in the subsequent pipeline, the second valve core 5 moves to the side with smaller pressure and drives the elastic piece 50 to extend until the second blocking opening 14 is moved to block the second blocking opening, so that the valve body 1 is closed, and when the pressure difference between the inside and the outside of the valve body 1 is small, the second valve core 5 can separate from the second blocking opening 14 and open the valve body 1 under the action of elastic reset of the elastic piece 50, so that the gas supply is effectively ensured to be in a safe state.
Further, referring to fig. 2, the first position is a position state when the valve stem 20 and the first core 21 close the first closure port 13;
referring to fig. 3 and 4, in the second position, after the first core 21 is separated from the first blocking opening 13, the valve rod 20 moves to a position state in which the elastic member 50 connected thereto can still extend to a position region where the second valve core 5 can block the valve cavity 10 under the action of the internal and external pressure difference of the valve cavity 10;
referring to fig. 5, in the third position, the valve rod 20 continues to drive the end of the elastic member 50 to move together based on the second position until the tensile force provided by the elastic member 50 on the second valve core 5 is greater than any point in the position area after the pressure difference between the inside and outside of the valve cavity 10 is applied, and the elastic member 50 reaches the maximum extension limit state, the second valve core 5 still cannot block any point in the position area of the valve cavity 10.
Referring to fig. 1, optionally, a locking rod 60 is disposed on the valve body 1, and the locking rod 60 is in threaded engagement with the valve body 1, and one end of the locking rod extends to the valve cavity 10 and can be fixedly connected with the end of the valve rod 20 in a threaded engagement.
The locking rod 60 has a threaded slot connected to the valve rod 20 at the end in the valve body 1, and the end of the valve rod 20 corresponds to the external thread structure operated by the thread.
By means of the arrangement, the end portion of the locking rod 60 located in the valve cavity 10 can be in threaded fit with the end portion of the valve rod 20, and the valve rod 20 cannot move in the axial direction at will at this time due to the fact that the locking rod 60 is in threaded fit with the valve body 1, and the valve body 1 can be continuously and stably in a closed state when the locking rod 60 is not separated from the valve rod 20.
In a second aspect, the embodiment of the application also provides a gas supply system, so as to solve the problem that the pipeline valve in the existing gas supply system is complex in structure.
A gas supply system, comprising:
a compressed gas cylinder;
the liquid outlet stop valve for the gas system is characterized in that the liquid inlet 11 is connected with the compressed gas cylinder through a conveying pipeline, and the liquid outlet 12 is connected with a gas supply pipeline.
The compressed gas cylinder can be used for remotely controlling the discharge of gas under the action of the liquid outlet stop valve, the liquid outlet stop valve is not required to be manually controlled to be opened or closed by an operator during normal use, and meanwhile, when the gas supply pipeline and the subsequent structure of the gas supply pipeline are in leakage, the gas supply system can effectively stop gas supply to the gas supply pipeline through the liquid outlet stop valve, so that the gas supply system has higher safety, and under special conditions, the liquid outlet stop valve can be manually operated to realize the functions of continuous closing or forced opening and the like, so that the gas supply system has remarkable practical application significance.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A liquid outlet shutoff valve for a gas system, comprising:
the valve body (1) is internally provided with a valve cavity (10), and two ends of the valve cavity (10) are respectively provided with a liquid inlet (11) and a liquid outlet (12) at two ends of the valve body (1);
the first valve core (2) is movably arranged in the valve cavity (10) so as to block or communicate with the valve cavity (10) when the first valve core moves;
an operation part (3) which is arranged on the outer wall of the valve body (1) and is connected with the first valve core (2) so as to drive the first valve core (2) to move when the operation part moves;
an electric control assembly (4) connected with the first valve core (2) for driving the first valve core (2) to block or communicate with the valve cavity (10);
the second valve core (5) is movably arranged in the valve cavity (10) at one side of the first valve core (2), is connected with the first valve core (2) through an elastic piece (50), and is configured with the second valve core (5) to drive the second valve core (5) to block or communicate with the valve cavity (10) according to the pressure difference between the space at the second valve core (5) and the external space communicated with the liquid outlet (12);
the first valve core (2) can at least move to a first position, a second position and a third position in the valve cavity (10) in sequence, and the first position, the second position and the third position are respectively configured as follows:
when the first valve element (2) is in the first position, it blocks the valve chamber (10);
when the first valve core (2) is positioned at the second position, the valve cavities (10) at two sides of the first valve core (2) are communicated;
when the first valve core (2) is positioned at the third position, the second valve core (5) and the elastic piece (50) are always positioned in a position area communicated with the valve cavity (10).
2. The outlet shutoff valve for a gas system according to claim 1, wherein the electric control assembly (4) is capable of driving at least the first valve spool (2) to the first position and the second position; the operating part (3) can drive the first valve core (2) to the first position, the second position and the third position.
3. The liquid outlet stop valve for a gas system according to claim 2, wherein the liquid outlet stop valve for a gas system is configured to,
the first valve core (2) can move to the first position through self gravity;
the electric control assembly (4) can drive the first valve core (2) to move to the second position at least;
the operation part (3) can drive the first valve core (2) to move to the second position and the third position.
4. A gas system outlet shutoff valve according to claim 3, wherein the electrical control assembly (4) is a solenoid valve member arranged outside the valve body (1), the solenoid valve member being configured to drive the first valve element (2) to move to the second position when energized.
5. The liquid outlet stop valve for a gas system according to claim 1, wherein a locking member is further provided on the valve body (1), and the locking member is detachably connected to at least the first valve element (2) in the first position and fixes the first valve element (2).
6. The liquid outlet shutoff valve for a gas system according to claim 5, wherein a first plug (13) is provided in the valve chamber (10), and the first valve element (2) includes:
one end of the valve rod (20) is penetrated into the valve cavity (10), the other end of the valve rod is connected with the operating part (3) and the electric control assembly (4) outside the valve cavity (10), and the elastic piece (50) is connected with the outer wall of the valve rod (20);
the first core body (21) is arranged on the valve rod (20) and positioned in the valve cavity (10) and can move to seal the first sealing opening (13) along with the valve rod (20).
7. The liquid outlet stop valve for a gas system according to claim 6, wherein a locking rod (60) is arranged on the valve body (1) in a penetrating way, the locking rod (60) is in threaded fit with the valve body (1), and one end of the locking rod extends to the valve cavity (10) and can be fixedly in threaded fit connection with the end part of the valve rod (20).
8. The liquid outlet stop valve for a gas system according to claim 1, wherein a second blocking opening (14) with a circular cross section is arranged in the valve cavity (10), and the second valve core (5) is a sphere capable of blocking the second blocking opening (14) when moving to the second blocking opening (14).
9. A gas supply system, comprising:
a compressed gas cylinder;
the liquid outlet stop valve for a gas system according to any one of claims 1 to 8, wherein the liquid inlet (11) is connected with the compressed gas cylinder through a conveying pipeline, and the liquid outlet (12) is connected with a gas supply pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111278991.6A CN113944767B (en) | 2021-10-31 | 2021-10-31 | Liquid outlet stop valve for gas system and gas supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111278991.6A CN113944767B (en) | 2021-10-31 | 2021-10-31 | Liquid outlet stop valve for gas system and gas supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113944767A CN113944767A (en) | 2022-01-18 |
| CN113944767B true CN113944767B (en) | 2023-11-03 |
Family
ID=79337204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111278991.6A Active CN113944767B (en) | 2021-10-31 | 2021-10-31 | Liquid outlet stop valve for gas system and gas supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113944767B (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04300476A (en) * | 1991-03-27 | 1992-10-23 | Osaka Gas Co Ltd | Excessive flow prevention valve |
| US6725880B1 (en) * | 1999-07-30 | 2004-04-27 | Dalin Liu | Constant flow control valve |
| CN2869509Y (en) * | 2006-02-10 | 2007-02-14 | 福清市兴融新电子科技有限公司 | Domestic gas leak cut-off safety valve |
| CN101657772A (en) * | 2007-04-20 | 2010-02-24 | 费希尔控制产品国际有限公司 | Secondary seat for gas regulator |
| CN204784817U (en) * | 2015-06-10 | 2015-11-18 | 骆益水 | Special ball valve of card pressure formula gas |
| CN206290345U (en) * | 2016-11-22 | 2017-06-30 | 河南欧意环保科技股份有限公司 | A kind of energy-saving automobile gas burning system |
| KR20170003493U (en) * | 2016-04-01 | 2017-10-12 | 덕산금속 주식회사 | Double sealing Structure and Valve Assembly for LPG Container |
| CN208311576U (en) * | 2018-05-09 | 2019-01-01 | 西安森驰燃气设备有限公司 | A kind of excessively flow integrated gas pipeline self-closing valve of band |
| CN208975052U (en) * | 2018-08-03 | 2019-06-14 | 福建海鲸消防有限公司 | Indoor fire hydrant |
| CN110469680A (en) * | 2019-08-27 | 2019-11-19 | 章慧 | A kind of solenoid valve being conveniently replaceable spring |
| CN112283427A (en) * | 2020-10-30 | 2021-01-29 | 浙江理工大学 | A gas self-closing valve |
| CN212868601U (en) * | 2020-08-14 | 2021-04-02 | 温州罗克阀门科技有限公司 | Stop check valve |
| CN113483130A (en) * | 2021-07-09 | 2021-10-08 | 西安东新石油设备厂有限公司 | Multifunctional pipeline gas self-closing valve and self-closing method thereof |
| CN214425200U (en) * | 2020-12-29 | 2021-10-19 | 玉环江林水暖管业股份有限公司 | Modular pipeline gas self-closing valve |
| CN214500904U (en) * | 2020-06-24 | 2021-10-26 | 黔西鹏发气体有限公司 | Automatic switching gas bus bar |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10109206B4 (en) * | 2001-02-26 | 2004-12-09 | Rexroth Mecman Gmbh | Multi-way valve for switching a pressure medium flow with parallel valve bores |
| US9371936B2 (en) * | 2014-09-17 | 2016-06-21 | Schneider Electric Buildings, Llc | Balanced globe valve assembly |
-
2021
- 2021-10-31 CN CN202111278991.6A patent/CN113944767B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04300476A (en) * | 1991-03-27 | 1992-10-23 | Osaka Gas Co Ltd | Excessive flow prevention valve |
| US6725880B1 (en) * | 1999-07-30 | 2004-04-27 | Dalin Liu | Constant flow control valve |
| CN2869509Y (en) * | 2006-02-10 | 2007-02-14 | 福清市兴融新电子科技有限公司 | Domestic gas leak cut-off safety valve |
| CN101657772A (en) * | 2007-04-20 | 2010-02-24 | 费希尔控制产品国际有限公司 | Secondary seat for gas regulator |
| CN204784817U (en) * | 2015-06-10 | 2015-11-18 | 骆益水 | Special ball valve of card pressure formula gas |
| KR20170003493U (en) * | 2016-04-01 | 2017-10-12 | 덕산금속 주식회사 | Double sealing Structure and Valve Assembly for LPG Container |
| CN206290345U (en) * | 2016-11-22 | 2017-06-30 | 河南欧意环保科技股份有限公司 | A kind of energy-saving automobile gas burning system |
| CN208311576U (en) * | 2018-05-09 | 2019-01-01 | 西安森驰燃气设备有限公司 | A kind of excessively flow integrated gas pipeline self-closing valve of band |
| CN208975052U (en) * | 2018-08-03 | 2019-06-14 | 福建海鲸消防有限公司 | Indoor fire hydrant |
| CN110469680A (en) * | 2019-08-27 | 2019-11-19 | 章慧 | A kind of solenoid valve being conveniently replaceable spring |
| CN214500904U (en) * | 2020-06-24 | 2021-10-26 | 黔西鹏发气体有限公司 | Automatic switching gas bus bar |
| CN212868601U (en) * | 2020-08-14 | 2021-04-02 | 温州罗克阀门科技有限公司 | Stop check valve |
| CN112283427A (en) * | 2020-10-30 | 2021-01-29 | 浙江理工大学 | A gas self-closing valve |
| CN214425200U (en) * | 2020-12-29 | 2021-10-19 | 玉环江林水暖管业股份有限公司 | Modular pipeline gas self-closing valve |
| CN113483130A (en) * | 2021-07-09 | 2021-10-08 | 西安东新石油设备厂有限公司 | Multifunctional pipeline gas self-closing valve and self-closing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113944767A (en) | 2022-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110848562B (en) | Liquid hydrogen filling device | |
| CN104864136B (en) | A kind of Electromagnetic Control quick action emergency valve | |
| CN106195630A (en) | A kind of intelligence filling gun | |
| CN113944767B (en) | Liquid outlet stop valve for gas system and gas supply system | |
| CN108163801B (en) | A kind of anti-safe refueling nozzle for pulling automatic fuel cut-off | |
| CN110864219B (en) | Liquid hydrogen filling device | |
| CN208816809U (en) | A kind of stop valve of pneumoelectric mixing control | |
| CN213808887U (en) | Gas emergency cut-off valve | |
| CN103055461B (en) | Low-torque linkage double-open fire hydrant | |
| CN113944876B (en) | Multi-gas cylinder gas supply system | |
| CN213018899U (en) | Low-pressure large-drift-diameter quick inflation connector | |
| CN101963253B (en) | Push-type multifunctional overflow-preventing fuel gas safety valve | |
| CN102678341B (en) | Gas inlet brake | |
| CN215950506U (en) | Passive emergency actuating mechanism | |
| CN107606243B (en) | Safety accessory control valve for road transportation dangerous cargo tank type vehicle | |
| CN215110777U (en) | Transverse sealing self-closing valve | |
| CN107401537A (en) | A kind of dead electricity closes valve hydraulic station | |
| CN110566704B (en) | Automatic control method for valve core of water valve | |
| CN110578828B (en) | Water valve control assembly | |
| CN212206785U (en) | Gas explosion tube | |
| CN110906017B (en) | Intelligent remote control electric valve powered by medium-voltage fuel gas battery | |
| CN207080428U (en) | Dead electricity closes valve hydraulic station | |
| CN212131397U (en) | Fool-proof disassembly-free check three-way valve | |
| CN215763500U (en) | Two-action self-closing valve with gas leakage alarm cut-off function | |
| CN203017629U (en) | Low-torque linkage dual-opening fire hydrant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |