CN116658623A - Airtight water delivery valve - Google Patents
Airtight water delivery valve Download PDFInfo
- Publication number
- CN116658623A CN116658623A CN202210174656.XA CN202210174656A CN116658623A CN 116658623 A CN116658623 A CN 116658623A CN 202210174656 A CN202210174656 A CN 202210174656A CN 116658623 A CN116658623 A CN 116658623A
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- CN
- China
- Prior art keywords
- floating
- cylinder
- floating column
- water
- water delivery
- 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.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 105
- 238000007789 sealing Methods 0.000 claims abstract description 33
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 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
-
- 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
-
- 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
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- 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
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/46—Attachment of sealing rings
-
- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
-
- 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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/18—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float
- F16K31/20—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a lift 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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
An airtight water delivery valve adopts an outer chute floating column and a convex circular sealing ring structure, designs a mechanism of floating up a slow water inlet floating column and rotating floating water delivery by high-pressure water flow impact, and belongs to the field of fire extinguishment; the volume is 1/10 of that of the wet alarm valve and the automatic drain valve, so that the problems of low-pressure air seepage and blocking of the automatic drain valve of the wet alarm valve are solved, and the wet alarm valve consists of a cover, a cylinder body, an inlet joint, a filter screen, a retainer ring, a floating column, a sealing ring, an O-shaped ring and an outlet joint; the cover is screwed on the upper end of the cylinder, the inlet joint is welded on the right side of the cylinder, the outlet joint is screwed on the lower end of the cylinder, the floating plunger enters the cylinder, and the sealing ring is nested on the lower end of the floating plunger; in the servo state, the inlet joint is filled with low-pressure gas, and the floating column is sealed; in the fire-fighting state, high-pressure water flow enters the cylinder, the water flow of the inclined cutting hole impacts the inclined upper side of the floating column, the floating column floats while rotating under the impact of the inclined cutting water flow, and water delivery is started; has wide application prospect in archives, treasury, military industry, ships and automatic storage.
Description
Technical Field
The invention relates to an airtight water delivery valve in a pre-action automatic fire extinguishing system, which is filled with 0.05MPa low-pressure seal at ordinary times, eliminates slow leakage ponding in real time, can output water flow to carry out feedback signals and sound alarm when the system starts water delivery fire extinguishing, adopts an outer chute floating column and convex round sealing ring structure, designs a mechanism of floating the slow water delivery floating column and rotating the floating water delivery by high-pressure water flow impact, optimally combines a traditional wet alarm valve and an automatic drainage valve into an airtight water delivery valve, has the volume of 1/10 of that of the wet alarm valve and the automatic drainage valve, and solves the problems of low-pressure air leakage and jamming of the automatic drainage valve of the wet alarm valve, and belongs to the field of fire extinguishing.
Background
The traditional pre-action alarm valve group consists of a rain alarm valve (a), a starting electromagnetic valve (b), an inflation valve (c), a wet alarm valve (d), a pressure switch (e), a hydraulic alarm bell (f) and an automatic drain valve (g), and has huge volume and complicated pipeline; when the rain alarm valve is on the watch state, the low-pressure gas of 0.05MPa is filled at ordinary times after the wet alarm valve, the front of the wet alarm valve is connected with a pressure switch, a hydraulic alarm bell and an automatic drain valve after the rain alarm valve, the wet alarm valve plays a role in unidirectional sealing gas, the gas is prevented from entering the hydraulic alarm bell and the pressure switch to malfunction, and the automatic drain valve drains accumulated water slowly leaked by the rain alarm valve; in the fire-fighting state, the deluge alarm valve is opened to release high-pressure water flow to extinguish fire, a part of water flow enters the hydraulic alarm bell to give out an acoustic alarm, enters the pressure switch to output a feedback signal, and the automatic drain valve is closed and sealed; the wet alarm valve adopts large plane sealing, and is frequently permeated with air at low pressure; the automatic drain valve is often blocked by scale adhesion; the prior equipment is not suitable for the application requirements of treasury, military industry, ships, tunnels and automatic storage compact space.
Disclosure of Invention
In order to reduce the volume and weight of equipment, the invention provides a novel airtight water delivery valve, wherein the traditional wet alarm valve and an automatic water discharge valve are optimally combined into one, the volume and weight are 1/10 of that of the wet alarm valve and the automatic water discharge valve, the problems of low-pressure air leakage and blocking of the automatic water discharge valve of the wet alarm valve are solved, the improved pre-action alarm valve consists of a rain alarm valve (a), a starting electromagnetic valve (b), an inflation valve (c), an airtight water delivery valve (h), a pressure switch (e) and a hydraulic alarm bell (f), and an outer chute floating column and a convex sealing ring structure are adopted, so that a mechanism of floating of a slow water inlet floating column and rotating floating water delivery by high-pressure water flow impact is designed; the airtight water delivery valve is composed of: the device comprises a cover (1), a cylinder body (2), an inlet joint (3), a filter screen (4), a retainer ring (5), a floating column (6), a sealing ring (7), an O-shaped ring (8) and an outlet joint (9); the cover is screwed on the upper end of the cylinder, the inlet joint is welded on the right side of the cylinder, the outlet joint is screwed on the lower end of the cylinder, the floating plunger enters the cylinder, and the sealing ring is nested on the lower end of the floating plunger; filling low-pressure gas into the inlet joint under the servo state, and sealing the floating column; under the fire-fighting state, high-pressure water flows into the cylinder, the floating columns float under the impact of oblique-cut water flows while rotating, and water delivery is started.
The invention is realized by the following steps: the device consists of a cover, a cylinder body, an inlet joint, a filter screen, a retainer ring, a floating column, a sealing ring, an O-shaped ring and an outlet joint; the inlet joint of the airtight water delivery valve is connected with the water outlet side of the rain alarm valve, and the outlet joint is connected with the pressure switch and the hydraulic alarm bell; the cover is screwed on the upper end of the cylinder, the inlet joint is welded on the right side of the cylinder, the outlet joint is screwed on the lower end of the cylinder, the inlet of the inlet joint is provided with a filter screen, the filter screen is clamped by a retainer ring, the floating plunger is inserted into the cylinder, and the sealing ring is nested on the lower end of the floating plunger; in the servo state, the inlet joint is filled with low-pressure gas of 0.05MPa, and the floating column is in a closed sealing state by utilizing the dead weight and the pressure difference of 0.05 MPa; when the water quantity reaches 2/3 of the height of the cylinder body, the floating column floats against the dead weight of the floating column and the pressure difference of 0.05MPa, and the slowly leaked accumulated water is discharged in real time; under the fire control state, the deluge alarm valve is opened to discharge water and extinguish fire, a part of high-pressure water flow enters the cylinder body from the inlet joint, the water flow of the inclined cutting hole of the inlet joint impacts the inclined upper side of the floating column, the floating column rotates and floats while being impacted by the inclined cutting water flow, the water flow is downwards output by the rectangular diversion chute outside the floating column, the water flow reaches the pressure switch, the pressure switch is closed, the action feedback signal of the output system is made, and the water flow alarm bell gives out alarm sound.
The novel beneficial effects of the invention are as follows: the traditional wet alarm valve and the automatic drain valve are optimally designed into an airtight water delivery valve, so that three functions of low-pressure sealing, slow leakage water discharge and effective water delivery during high-pressure water inlet are realized, and the blank in the industry is filled; the volume/weight of the airtight water delivery valve is 1/10 of that of the wet alarm valve and the automatic water discharge valve, raw materials are saved, the energy consumption for casting and processing is reduced, the control pipe fitting of the pre-action alarm valve group is simplified, and the maintenance and emergency operation are simple; the convex round sealing ring structure ensures the tightness of low air pressure, the floating column is lifted by the water level, slow leakage ponding is discharged in real time, high-pressure water flow impacts the floating column to rotate and float, high-pressure water flow can be effectively output when high-pressure water enters, hidden dangers of water rising the floating column in a straight line are prevented, scale accumulated on the outer edge of the floating column is eliminated during rotation, the problem of blocking is solved, and the application requirements of compact space in book archives, collection libraries, vaults, military industry, ships, tunnels and automatic storage are met.
Drawings
The invention will now be further described with reference to the accompanying drawings and examples.
FIG. 1 is a schematic diagram of a novel piping system according to the present invention.
Fig. 2 is a piping schematic diagram of a conventional pre-action alarm valve set.
FIG. 3 is a block diagram of a novel airtight water transfer valve of the present invention.
FIG. 4 is a cross-sectional view of a novel floating column of the present invention.
Fig. 5 is a left side view of the novel floating column of the present invention.
FIG. 6 is a top view of a novel floating column of the present invention.
FIG. 7 is a cross-sectional view of an inlet fitting in accordance with the novel teachings of the present invention.
Fig. 8 is a left side view of the novel interface adapter of the present invention.
The technical scheme adopted by the invention for solving the technical problems is as follows:
by adopting an outer chute floating column and a convex round sealing ring structure, a mechanism of floating up a slow water inlet floating column and rotating floating water delivery by high-pressure water flow impact is designed; in the servo state, the inlet joint is filled with low-pressure gas of 0.05MPa, and the floating column is in a closed sealing state by utilizing the dead weight and the pressure difference of 0.05 MPa; when the rain alarm valve is in a long-term waiting state, a trace amount of slow leakage often occurs, water which is leaked slowly enters the cylinder and accumulates in the cylinder, and when the water level reaches 2/3 of the height of the cylinder, the floating column floats to drain the accumulated water which is leaked slowly; under the fire control state, the deluge alarm valve opens out water, and a part of high-pressure water flow gets into the barrel from the inlet connection, and the oblique upside of floating post is impacted to the oblique water flow in the inlet connection, and the floating post receives the impact of oblique water flow rotatory, the limit is floated and is played, and the rivers are along the downward output of 4 rectangle water conservancy diversion chute in the outer circle of floating post, the cross-sectional area of water connector: area of chute of floating column 4: the cross section area of the chamfer hole of the inlet joint is 1.5:1.2:1.0, so that water is not retained in the cylinder body.
Detailed Description
The airtight water delivery valve is composed of: the device comprises a cover 1, a cylinder 2, an inlet joint 3, a filter screen 4, a retainer ring 5, a floating column 6, a sealing ring 7, an O-shaped ring 8 and an outlet joint 9; the inlet joint 3 of the airtight water delivery valve is connected with the water outlet side of the rain alarm valve a, and the outlet joint 9 is connected with the pressure switch e and the hydraulic alarm bell f through pipe fittings; the cover 1 is screwed on the upper end of the cylinder 2, static seal is kept by the O-shaped ring 8, the inlet joint 3 is welded on the right side of the cylinder 2, the outlet joint 9 is screwed on the lower end of the cylinder 2, static seal is kept by the O-shaped ring 8, the inlet of the inlet joint 3 is provided with the filter screen 4, the filter screen 4 is clamped by the retainer ring 5, the floating column 6 is plugged into the cylinder 2, and the sealing ring 7 is nested at the lower end of the floating column 6; in the servo state, the inlet joint 3 is filled with 0.05MPa low-pressure gas, and the floating column 6 is in a closed sealing state by utilizing the dead weight and the pressure difference of 0.05 MPa; in the servo state, the rain alarm valve a is influenced by pipe network vibration and water source pressure fluctuation for a long time, trace slow leakage often occurs, slow leakage water enters the cylinder 2 from the inlet joint 3, and is accumulated in the cylinder 2, when the water level reaches 2/3 of the height of the cylinder 2, the floating column 6 floats against the dead weight of the floating column and the pressure difference of 0.05MPa, the slow leakage water is discharged in real time, and when the water level is reduced to 1/3 of the height of the cylinder 2, the floating column 6 falls down to restore sealing; in a fire-fighting state, the deluge alarm valve a is opened to discharge water and extinguish fire, a part of high-pressure water flow enters the cylinder 2 from the inlet joint, the water flow in the inclined cut hole in the inlet joint 3 impacts the inclined upper side of the floating column 6, the floating column 6 rotates and floats when impacted by the inclined cut water flow, the water flow is downwards output by the 4 rectangular diversion chute on the outer circle of the floating column, the pressure switch e is closed to output a feedback signal, and the pressure switch e sends out alarm sound to the hydraulic alarm bell f; the airtight water delivery valve adopts an outer chute floating column and a convex round sealing ring structure, and designs a mechanism of floating up a slow water inlet floating column 6 and rotating floating water delivery by high-pressure water flow impact; the floating column 6 is in a closed sealing state by utilizing the dead weight and the pressure difference of 0.05MPa, a convex sealing ring is designed on the lower plane of the sealing ring 7, and the sealing ring belongs to linear sealing, so that the tightness of low air pressure is ensured; in a fire-fighting state, the rain alarm valve a is opened to discharge water and extinguish fire, a part of high-pressure water flow enters the cylinder 2 from the inlet joint 3, the water flow in the inclined cut hole in the inlet joint 3 impacts the inclined upper side of the floating column 6, the floating column 6 rotates and floats while being impacted by the inclined cut water flow, the water flow is downwards output along the 4 rectangular diversion chute on the outer circle of the floating column, the rotating function of the floating column 6 is to promote the floating column to float and rotate to eliminate scale accumulated on the outer edge, and the water delivery efficiency of the 4 diversion chute is improved; the sealing ring 7 is nested in the groove at the lower end of the floating column 6 and cannot be washed off and dropped by water flow; the diameter of the outer circle of the middle section of the floating column 6 is 5mm smaller than that of the outer circle of the upper end and the lower end, 4 diversion trenches are uniformly distributed on the circular section, the diversion trenches incline to the left by 10 degrees, the oblique design of the diversion trenches improves the water delivery capacity of the straight diversion trenches by 35%, the diameter of the outer circle of the middle section of the floating column 6 is 5mm smaller than that of the outer circle of the upper end and the lower end, the friction area with the cylinder body 2 is reduced, the rotation jam is avoided, the impurities are contained, the excessive flow is increased, the floating force is improved, and the outer circle of the upper end and the lower end plays a guiding role; the outer circle on the right side of the inlet joint 3 is a taper pipe thread, a shaft shoulder is designed on the left side, a retainer ring clamping groove, a filter screen counter bore, a straight hole and a bevel hole are machined in the center from the right to the left, the bevel hole is inclined by 10 degrees in the axial direction and 20 degrees in the radial direction, the inlet joint 3 is arranged on the side of the cylinder body, and the bevel water flow impacts the floating column 6 to rotate, so that scale accumulated on the outer edge of the floating column 6 is effectively eliminated, the problem of jamming is solved, and the reliability is improved.
1) Material quality: the cover 1, the cylinder 2, the inlet joint 3, the filter screen 4, the retainer ring 5 and the outlet joint 9 are made of stainless steel, the O-shaped ring 8 is made of neoprene, the sealing ring 7 is made of molded nitrile rubber, and the floating column 6 is made of polystyrene particle foam through compression molding.
2) Inlet, outlet: r3/4'.
3) The installation mode is as follows: vertical.
4) Hydraulic pressure intensity: 2.4MPa, no leakage and no deformation.
5) And (3) air pressure sealing: 0.05MPa, and no gas leakage.
6) 1.6MPa water delivery: > 100L/min.
Claims (3)
1. An airtight water delivery valve is characterized in that an outer chute floating column and a convex circular sealing ring structure are adopted, and a mechanism of floating up a slow water inlet floating column and rotating floating water delivery by high-pressure water flow impact is designed; the airtight water delivery valve is composed of: the device comprises a cover (1), a cylinder body (2), an inlet joint (3), a filter screen (4), a retainer ring (5), a floating column (6), a sealing ring (7), an O-shaped ring (8) and an outlet joint (9); the cover is screwed on the upper end of the cylinder, the inlet joint is welded on the right side of the cylinder, the outlet joint is screwed on the lower end of the cylinder, the floating plunger enters the cylinder, and the sealing ring is nested on the lower end of the floating plunger; in the servo state, the inlet joint is filled with low-pressure gas, and the floating column is sealed; under the fire-fighting state, high-pressure water flows into the cylinder, the floating columns float while rotating under the impact of oblique-cut water flows, and water delivery is started.
2. The airtight water delivery valve according to claim 1, wherein the floating column has a middle section outer circle which is smaller than the diameter of the upper and lower end outer circles by 5mm, 4 diversion trenches are uniformly distributed on the circular section, and the diversion trenches incline to the left by 10 degrees.
3. The airtight water supply valve according to claim 1, wherein the inlet joint, the right outer circle is taper pipe thread, the left side is designed with a shaft shoulder, the center is processed with a retainer slot, a filter screen counter bore, a straight hole and a bevel cut hole from right to left, the bevel cut hole is inclined by 10 degrees in the axial direction and 20 degrees in the radial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210174656.XA CN116658623A (en) | 2022-02-21 | 2022-02-21 | Airtight water delivery valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210174656.XA CN116658623A (en) | 2022-02-21 | 2022-02-21 | Airtight water delivery valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116658623A true CN116658623A (en) | 2023-08-29 |
Family
ID=87715887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210174656.XA Pending CN116658623A (en) | 2022-02-21 | 2022-02-21 | Airtight water delivery valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116658623A (en) |
-
2022
- 2022-02-21 CN CN202210174656.XA patent/CN116658623A/en active Pending
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