CN114593224A - Non-resistance backflow preventer with double gate valves - Google Patents
Non-resistance backflow preventer with double gate valves Download PDFInfo
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- CN114593224A CN114593224A CN202210382180.9A CN202210382180A CN114593224A CN 114593224 A CN114593224 A CN 114593224A CN 202210382180 A CN202210382180 A CN 202210382180A CN 114593224 A CN114593224 A CN 114593224A
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- gate valve
- valve rod
- backflow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/12—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with wedge-shaped arrangements of sealing faces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0227—Packings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
- F16K7/14—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat
- F16K7/17—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat the diaphragm being actuated by fluid pressure
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Driven Valves (AREA)
- Check Valves (AREA)
Abstract
The invention discloses a double-gate valve resistance-free backflow preventer, which comprises a front-end gate valve and a rear-end gate valve, wherein a front-end lower assembly block is arranged at the lower end of the front-end gate valve and is communicated with a liquid inlet cavity and a liquid outlet cavity of the front-end gate valve, a rear-end lower assembly block is arranged at the lower end of the rear-end gate valve and is communicated with the liquid inlet cavity of the front-end gate valve and the liquid outlet cavity of the rear-end gate valve, and a backflow-preventing function external channel which leads pressure water to the outside and is communicated with valve rods of the front-end gate valve and the rear-end gate valve is arranged in the rear-end gate valve. The invention can lead out pressure water generated in backflow through the front end lower assembly block and the rear end lower assembly block, lead the pressure water into the valve rod through the external channel with the backflow prevention function, realize the sealed lead-in of the pressure water through the two sealing sleeves and the one supporting sleeve, and realize the locking and the separation of the flashboard and the valve rod through the flashboard pin, the backflow prevention push rod and the reset spring.
Description
Technical Field
The invention belongs to the technical field of pipe network design, and particularly relates to a double-gate valve resistance-free backflow preventer.
Background
The gate valve is a valve body that often can use in the pipe network design, and the gate valve embeds there is the flashboard, and the flashboard is the regulation and control structure of core in the gate valve, compares in other valves, and the axial dimension of gate valve is less, and the compactness of structure is more, and the suitability is very strong.
However, the existing pipe network design does not have a resistance-free backflow prevention structure for the double gate valves, and a backflow prevention member capable of preventing backflow of the pipe network is urgently needed.
Disclosure of Invention
The invention is provided for solving the problems in the prior art, and aims to provide a double-gate valve resistance-free backflow preventer.
The technical scheme of the invention is as follows: the utility model provides a non-resistance backflow preventer of double-gate valve, includes front end gate valve, rear end gate valve, the play sap cavity of front end gate valve forms the intermediate chamber with the feed liquor chamber intercommunication of rear end gate valve, front end gate valve lower extreme is provided with assembles the piece under the front end, assemble piece and the feed liquor chamber of front end gate valve, play sap cavity intercommunication under the front end, rear end gate valve lower extreme is provided with assembles the piece under the rear end, assemble piece and the feed liquor chamber of front end gate valve, the play sap cavity intercommunication of rear end gate valve under the rear end, be provided with the external passageway of anti-backflow function that leads pressure water outward in the rear end gate valve, the external passageway other end of anti-backflow function communicates with the valve rod of front end gate valve, rear end gate valve.
Furthermore, the outer wall of the rear-end lower assembly block is arranged on a diaphragm control upper cavity external channel, and the diaphragm control upper cavity external channel is communicated with the front-end lower assembly block.
Furthermore, the external channel with the backflow prevention function comprises a main pipeline, two branch pipelines are connected to the main pipeline in parallel, and the two branch pipelines are respectively communicated with the valve rods of the front-end gate valve and the rear-end gate valve.
Furthermore, a valve rod is arranged in the valve body, an upper valve rod sealing sleeve, a valve rod sealing support sleeve and a lower valve rod sealing sleeve are arranged on the inner wall of the valve body from top to bottom, and the upper valve rod sealing sleeve and the lower valve rod sealing sleeve realize the sealing between the valve body and the valve rod.
Furthermore, the thickness of the valve rod sealing support sleeve is smaller than that of the valve rod upper sealing sleeve and that of the valve rod lower sealing sleeve, a containing cavity is formed among the valve rod upper sealing sleeve, the valve rod sealing support sleeve, the valve rod lower sealing sleeve and the valve rod, a through hole is formed in the valve rod sealing support sleeve, and the through hole is communicated with the containing cavity.
Furthermore, a valve cover side backflow prevention functional channel is arranged on the outer wall of the valve body and is communicated with the backflow prevention external functional channel, and a through hole in the valve rod sealing support sleeve is communicated with the backflow prevention functional channel on the side of the valve cover.
Furthermore, a backflow preventing functional channel inside the valve rod is formed in the valve rod and comprises a radial section and an axial section, the radial section is communicated with the accommodating cavity, and a plug is arranged at the bottom of the axial section.
Furthermore, form horizontal locking hole in the valve rod, horizontal locking hole and the inside axial section intercommunication of function passageway of preventing flowing backwards of valve rod, be provided with the push rod that prevents flowing backwards that can slide in the horizontal locking hole, be provided with the flashboard cylindric lock that inserts in the horizontal locking hole in the flashboard, flashboard cylindric lock is with flashboard, valve rod locking.
Furthermore, a groove is formed in the outer wall of the backflow preventing push rod, a sealing ring is arranged in the groove, and a guide limiting ring is embedded in the outer wall of the valve rod.
Furthermore, a mounting head is arranged in the gate, and a return spring is arranged between the mounting head and the gate pin and used for pushing the gate pin into the transverse locking hole.
The invention can lead out pressure water generated in backflow through the front end lower assembly block and the rear end lower assembly block, lead the pressure water into the valve rod through the external channel with the backflow prevention function, realize the sealed lead-in of the pressure water through the two sealing sleeves and the one supporting sleeve, and realize the locking and the separation of the flashboard and the valve rod through the flashboard pin, the backflow prevention push rod and the reset spring.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an assembled view of a front lower assembly block of the present invention;
FIG. 3 is an assembled view of a rear lower mounting block of the present invention;
FIG. 4 is a schematic view of the assembly of the valve stem seal support sleeve of the present invention;
FIG. 5 is a schematic view of the assembly of the shutter of the present invention;
wherein:
1 urban water supply upstream end 2 urban water supply downstream end
3 front end gate valve 4 rear end gate valve
5 middle cavity 6 front end diaphragm control upper cavity channel
7 front end diaphragm control upper cavity 8 water drainage diaphragm
9 middle cavity diaphragm controlled lower cavity and 10 middle cavity controlled lower cavity channel
11 backflow water drainage channel 12 diaphragm control upper cavity external channel
13 rear diaphragm control upper chamber 14 sealing diaphragm
15 reversing valve core 16 rear end diaphragm control lower cavity channel
17 rear end diaphragm control lower cavity 18 backflow prevention function inner channel
19 pressure relief spring 20 pressure relief passage
21 external channel with backflow prevention function 22 valve cover side surface backflow prevention function channel
23 valve rod internal backflow prevention functional channel 24 valve rod upper sealing sleeve
25 valve rod sealing support sleeve 26 lower valve rod sealing sleeve
27 backflow-preventing push rod 28 gate plate pin
29 return spring.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in fig. 1-5, a non-resistance backflow preventer with double gate valves comprises a front-end gate valve 3 and a rear-end gate valve 4, wherein a liquid outlet cavity of the front-end gate valve 3 is communicated with a liquid inlet cavity of the rear-end gate valve 4 to form an intermediate cavity 5, a front-end lower end of the front-end gate valve 3 is provided with a front-end lower assembly block, the front-end lower assembly block is communicated with the liquid inlet cavity and the liquid outlet cavity of the front-end gate valve 3, a rear-end lower assembly block is arranged at the lower end of the rear-end gate valve 4, the rear-end lower assembly block is communicated with the liquid inlet cavity of the front-end gate valve 3 and the liquid outlet cavity of the rear-end gate valve 4, a backflow-preventing function external passage 21 for guiding pressurized water outwards is arranged in the rear-end gate valve 4, and the other end of the backflow-preventing function external passage 21 is communicated with the valve rods of the front-end gate valve 3 and the rear-end gate valve 4.
The outer wall of the rear-end lower assembly block is arranged on a diaphragm control upper cavity external channel 12, and the diaphragm control upper cavity external channel 12 is communicated with the front-end lower assembly block.
The external channel 21 with the backflow prevention function comprises a main pipeline, two branch pipelines are connected in parallel on the main pipeline, and the two branch pipelines are respectively communicated with the valve rods of the front-end gate valve 3 and the rear-end gate valve 4.
The valve body is internally provided with a valve rod, the inner wall of the valve body is provided with an upper valve rod sealing sleeve 24, a valve rod sealing support sleeve 25 and a lower valve rod sealing sleeve 26 from top to bottom, and the upper valve rod sealing sleeve 24 and the lower valve rod sealing sleeve 26 realize the sealing between the valve body and the valve rod.
The thickness of the valve rod sealing support sleeve 25 is smaller than that of the valve rod upper sealing sleeve 24 and that of the valve rod lower sealing sleeve 26, a containing cavity is formed among the valve rod upper sealing sleeve 24, the valve rod sealing support sleeve 25, the valve rod lower sealing sleeve 26 and the valve rod, a through hole is formed in the valve rod sealing support sleeve 25, and the through hole is communicated with the containing cavity.
A valve cover side backflow prevention functional channel 22 is arranged on the outer wall of the valve body, the valve cover side backflow prevention functional channel 22 is communicated with the backflow prevention functional external connecting channel 21, and a through hole in the valve rod sealing support sleeve 25 is communicated with the backflow prevention functional channel 22 on the side of the valve cover.
Form the inside anti-backflow functional channel 23 of valve rod in the valve rod, the inside anti-backflow functional channel 23 of valve rod includes radial section and axial segment, radial section with hold the chamber intercommunication, axial segment bottom is provided with the end cap.
The valve rod is internally provided with a transverse locking hole which is communicated with an axial section of a backflow-preventing functional channel 23 inside the valve rod, a backflow-preventing push rod 27 capable of sliding is arranged in the transverse locking hole, a gate plate pin 28 inserted into the transverse locking hole is arranged in the gate plate, and the gate plate pin 28 locks the gate plate and the valve rod.
The outer wall of the backflow prevention push rod 27 is provided with a groove, a sealing ring is arranged in the groove, and a guide limiting ring is embedded in the outer wall of the valve rod.
A mounting head is provided in the shutter, and a return spring 29 is provided between the mounting head and the shutter pin 28, the return spring 29 urging the shutter pin 28 into the lateral locking hole.
And a sealing ring is arranged between the flashboard and the valve rod, so that the flashboard and the valve rod are sealed.
A stepped hole is formed in the gate plate, a large-diameter section of the stepped hole is used for installing an installation head, the installation head is embedded, a small-diameter section of the stepped hole is used for guiding, the gate plate pin 28 slides in the small-diameter hole, and meanwhile the small-diameter hole accommodates the reset spring 29.
The backflow prevention push rods 27 are arranged in a bilateral symmetry manner.
The maximum outward-pushing position of the backflow-preventing push rod 27 is flush with the outer wall of the valve rod.
High water pressure enters the valve rod internal backflow prevention functional channel 23, the backflow prevention push rod 27 pushes outwards, the gate plate pin 28 is pushed back to the gate plate, and therefore locking between the gate plate and the valve rod is opened, and the gate plate falls down to achieve backflow prevention and cutoff.
The liquid inlet cavity of the front-end gate valve 3 is communicated with the urban water supply upstream end 1, and the liquid outlet cavity of the rear-end gate valve 4 is communicated with the urban water supply downstream end 2.
A front end diaphragm control upper cavity channel 6 is formed in the front end lower assembly block, one end of the front end diaphragm control upper cavity channel 6 is communicated with a liquid inlet cavity of the front end gate valve 3, and the other end of the front end diaphragm control upper cavity channel is communicated with a front end diaphragm control upper cavity 7; an intermediate cavity control lower cavity channel 10 is also formed in the front end lower assembly block, one end of the intermediate cavity control lower cavity channel 10 is communicated with the intermediate cavity 5, and the other end of the intermediate cavity control lower cavity channel 10 is communicated with the intermediate cavity diaphragm control lower cavity 9.
A water drainage membrane 8 is arranged in the front-end lower assembly block, and the water drainage membrane 8 divides an inner cavity in the front-end lower assembly block into a front-end membrane control upper cavity 7 located above and a middle cavity membrane control lower cavity 9 located below.
Form rear end diaphragm control epicoele 13 in the assembly piece under the rear end, rear end diaphragm control epicoele 13 still forms rear end diaphragm control cavity of resorption passageway 16 in the assembly piece under the rear end through diaphragm control epicoele external connection passageway 12 and front end diaphragm control epicoele passageway 6 intercommunication, rear end diaphragm control cavity of resorption passageway 16 and rear end diaphragm control cavity of resorption 17 intercommunication.
A sealing diaphragm 14 is arranged in the rear-end lower assembly block, and the sealing diaphragm 14 divides an inner cavity in the rear-end lower assembly block into a rear-end diaphragm control upper cavity 13 located above and a rear-end diaphragm control lower cavity 17 located below.
The rear-end lower assembly block is also internally provided with a backflow prevention function inner channel 18, the backflow prevention function inner channel 18 is internally provided with a reversing valve core 15 for top sealing, the outer wall of the reversing valve core 15 is provided with a backflow prevention function outer connecting channel 21, and the sealing diaphragm 14 controls the backflow prevention function inner channel 18 and the rear-end diaphragm control lower cavity channel 16 to be switched on and off.
A pressure relief channel 20 is arranged in the backflow prevention function inner channel 18, and a pressure relief spring 19 is arranged between the pressure relief channel 20 and the reversing valve core 15.
And a backflow water drainage channel 11 is formed in the front-end lower assembly block, the backflow water drainage channel 11 is communicated with the lower cavity 9 controlled by the middle cavity diaphragm, and the water drainage diaphragm 8 controls the backflow water drainage channel 11 and the middle cavity to control the on-off of the lower cavity 10.
The front end diaphragm control upper cavity channel 6 comprises an inclined section positioned at the upper part, an L section positioned at the middle part and a vertical section positioned at the lower part, and the vertical section is communicated with the front end diaphragm control upper cavity 7.
The middle cavity lower control cavity channel 10 comprises an inclined section positioned at the upper part, a vertical section positioned at the middle part and an L section positioned at the lower part, wherein the L section is communicated with the middle cavity diaphragm lower control cavity 9.
And a communicating part is formed in the L section of the front end diaphragm control upper cavity channel 6 and is communicated with the diaphragm control upper cavity external channel 12.
Correspondingly, a plugging part is formed in the L section of the lower cavity channel 10 controlled by the middle cavity, and a plug is arranged in the plugging part.
And quick connectors are arranged at two ends of the diaphragm control upper cavity external channel 12.
The rear end diaphragm control lower cavity passage 16 also comprises an L section, a blocking part is formed in the L section, and a plug is arranged in the blocking part.
The front end lower assembly block and the rear end lower assembly block are fixed with the valve body in a flange bolt mode.
The working process of the invention is as follows:
the double-gate valve non-resistance backflow preventer is composed of two backflow-preventing gate valves with backflow-preventing devices, and is normally closed and opened, and the specific process is as follows:
the pressure of water at the upstream end 1 of urban water supply is high, the flow path of high pressure water is provided with a front-end gate valve 3 with a backflow prevention device, a middle cavity 5, a rear-end gate valve 4 with a backflow prevention device and the downstream end 2 of urban water supply, and at the moment, the pressure of water at the front-end diaphragm control upper cavity channel 6, the diaphragm control upper cavity external channel 12, the front-end diaphragm control upper cavity 7, the rear-end diaphragm control upper cavity 13 is higher than that of water at the middle-cavity diaphragm control lower cavity channel 10, the rear-end diaphragm control lower cavity channel 16, the middle-cavity diaphragm control lower cavity 9 and the rear-end diaphragm control lower cavity 17; the front end diaphragm control upper cavity 7 and the rear end diaphragm control upper cavity 13 respectively press the water drainage diaphragm 8 and the sealing diaphragm 14, so that the middle cavity control lower cavity channel 10 is respectively ensured to be isolated from the backflow water drainage channel 11, and no water leakage of the middle cavity exists; meanwhile, the sealing port in the sealing diaphragm 14 is ensured to block the rear-end diaphragm control lower cavity channel 16 and the rear-end diaphragm control lower cavity 17 from flowing to the backflow-preventing function inner channel 18, and at the moment, the backflow-preventing function inner channel 18 has no pressure water.
An upper sealing port of the reversing valve core 15 blocks the internal channel 18 with the backflow prevention function and the external channel 21 with the backflow prevention function under the action of a pressure relief spring 19; the external backflow prevention function channel 21 is communicated with the pressure relief channel 20 through a lower sealing port of the reversing valve core 15, and channels such as the external backflow prevention function channel 21, the backflow prevention function channel 22 on the side face of the valve cover, the backflow prevention function channel 23 in the valve rod and the like are in a pressure-free water state. The backflow prevention push rod 27 has no action, the valve plate pin 28 extends into the running axial hole of the valve rod backflow prevention push rod 27 under the action of the reset spring 29, the valve rod is locked to drive the valve plate to run up and down, and normal closing and opening of the two valves are guaranteed.
The non-resistance backflow preventer of double-gate valve pollutes the refluence and takes place the state, and specific process is as follows:
the pressure of water at the downstream end 2 of the urban water supply is high, high-pressure water flows to a gate valve 4 with a backflow prevention device, a middle cavity 5, a front-end gate valve 3 with the backflow prevention device and the upstream end 1 of the urban water supply, the pressure of the water at the rear-end diaphragm control lower cavity channel 16 and the pressure of the water at the rear-end diaphragm control lower cavity 17 are high, and the pressure of the water is higher than that of the water at the front-end diaphragm control upper cavity channel 6, the diaphragm control upper cavity external channel 12 and the rear-end diaphragm control upper cavity 13; the rear end diaphragm control lower cavity 17 jacks up the sealing diaphragm 14, the rear end diaphragm control lower cavity 17 is communicated with the backflow prevention function inner channel 18, high-pressure water appears, the upper sealing port of the high-pressure water pressure reversing valve core is opened, the lower sealing port is closed, high-pressure water in the backflow prevention function inner channel 18 flows to the backflow prevention function outer channel 21, the backflow prevention function channel 22 is arranged on the side surface of the valve cover of the two gate valves, meanwhile, the high-pressure water pressure flows to the backflow prevention function channel 23 in the valve rod through a closed space formed by combining a valve rod upper sealing sleeve, a valve rod supporting sleeve with a plurality of small flow passing holes and a valve rod lower sealing sleeve, the high-pressure water pressure pushes the backflow prevention push rod 27, the valve rod pin 28 is pushed to exit from the operation shaft hole of the valve rod, and the locking of the valve plate and the valve rod is avoided. Thereby the valve plate falls under the dead weight effect, and the free seal mouth that closes reaches the function of two non return of anti-reflux.
When the valve plates of the two gate valves are damaged in a sealing mode, when backflow water flows to the middle cavity, high-pressure water in the middle cavity 5 appears, the water pressure is higher than that of the upstream end 1 of urban water supply, at the moment, the middle cavity controls the lower cavity channel 10 to flow to the middle cavity diaphragm control lower cavity 9, the pressure water is higher than that of the diaphragm control upper cavity channel 6, the water drainage diaphragm 8 is opened, backflow water in the middle cavity 5 flows out of the valve through the middle cavity diaphragm control lower cavity channel 10, the middle cavity diaphragm control lower cavity 9 and the backflow water drainage channel 11, and the backflow pollution diffusion preventing function is achieved.
The invention can lead out pressure water generated in backflow through the front end lower assembly block and the rear end lower assembly block, lead the pressure water into the valve rod through the external channel with the backflow prevention function, realize the sealed lead-in of the pressure water through the two sealing sleeves and the one supporting sleeve, and realize the locking and the separation of the flashboard and the valve rod through the flashboard pin, the backflow prevention push rod and the reset spring.
Claims (10)
1. The utility model provides a non-resistance backflow preventer of double gate valve, includes front end gate valve (3), rear end gate valve (4), its characterized in that: the feed liquor chamber intercommunication formation intermediate chamber (5) of the play liquid chamber of front end gate valve (3) and rear end gate valve (4), front end gate valve (3) lower extreme is provided with assembly piece under the front end, assembly piece and the feed liquor chamber of front end gate valve (3), play liquid chamber intercommunication under the front end, rear end gate valve (4) lower extreme is provided with assembly piece under the rear end, assembly piece and the feed liquor chamber of front end gate valve (3), the play liquid chamber intercommunication of rear end gate valve (4) under the rear end, be provided with in rear end gate valve (4) with the external passageway (21) of the anti-backflow function of pressure water outer guide, the valve rod intercommunication of the external passageway (21) other end of anti-backflow function and front end gate valve (3), rear end gate valve (4).
2. The non-resistance backflow preventer of a double gate valve according to claim 1, wherein: the outer wall of the rear-end lower assembly block is arranged in a diaphragm control upper cavity external connection channel (12), and the diaphragm control upper cavity external connection channel (12) is communicated with the front-end lower assembly block.
3. The non-resistance backflow preventer of a double gate valve according to claim 1, wherein: the backflow prevention function external connection channel (21) comprises a main pipeline, two branch pipelines are connected to the main pipeline in parallel, and the two branch pipelines are respectively communicated with valve rods of the front-end gate valve (3) and the rear-end gate valve (4).
4. A dual gate valve non-resistance backflow preventer as claimed in claim 3, wherein: the valve body is internally provided with a valve rod, an upper valve rod sealing sleeve (24), a sealing and supporting sleeve (25) and a lower valve rod sealing sleeve (26) are arranged on the inner wall of the valve body from top to bottom, and the upper valve rod sealing sleeve (24) and the lower valve rod sealing sleeve (26) realize the sealing between the valve body and the valve rod.
5. A double gate valve non-resistance backflow preventer as claimed in claim 4, wherein: valve rod seal supports cover (25) thickness and is less than seal cover (24) on the valve rod, seal cover (26) under the valve rod, and what formed between seal cover (24) on the valve rod, valve rod seal supports cover (25), seal cover (26) under the valve rod, the valve rod holds the chamber, form the through-hole in the valve rod seal supports cover (25), the through-hole with hold the chamber intercommunication.
6. A double gate valve non-resistance backflow preventer as claimed in claim 5, wherein: a valve cover side backflow prevention functional channel (22) is arranged on the outer wall of the valve body, the valve cover side backflow prevention functional channel (22) is communicated with a backflow prevention external connecting channel (21), and a through hole in the valve rod sealing support sleeve (25) is communicated with the backflow prevention functional channel (22) on the side of the valve cover.
7. The non-resistance backflow preventer of a double gate valve according to claim 6, wherein: form inside anti-backflow function passageway (23) of valve rod in the valve rod, inside anti-backflow function passageway (23) of valve rod includes radial section and axial segment, radial section with hold the chamber intercommunication, axial segment bottom is provided with the end cap.
8. The non-resistance backflow preventer of a double gate valve according to claim 7, wherein: the valve comprises a valve rod and is characterized in that a transverse locking hole is formed in the valve rod and is communicated with an axial section of a backflow-preventing functional channel (23) in the valve rod, a backflow-preventing push rod (27) capable of sliding is arranged in the transverse locking hole, a gate plate pin (28) inserted into the transverse locking hole is arranged in the gate plate, and the gate plate and the valve rod are locked by the gate plate pin (28).
9. The non-resistance backflow preventer of a double gate valve according to claim 8, wherein: the anti-backflow push rod (27) is characterized in that a groove is formed in the outer wall of the anti-backflow push rod, a sealing ring is arranged in the groove, and a guide limiting ring is embedded in the outer wall of the valve rod.
10. The dual gate valve non-resistance backflow preventer of claim 9, wherein: a mounting head is arranged in the gate, a return spring (29) is arranged between the mounting head and the gate pin (28), and the return spring (29) pushes the gate pin (28) into the transverse locking hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210382180.9A CN114593224B (en) | 2022-04-13 | 2022-04-13 | Double gate valve non-resistance backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210382180.9A CN114593224B (en) | 2022-04-13 | 2022-04-13 | Double gate valve non-resistance backflow preventer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114593224A true CN114593224A (en) | 2022-06-07 |
| CN114593224B CN114593224B (en) | 2024-07-23 |
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ID=81811620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210382180.9A Active CN114593224B (en) | 2022-04-13 | 2022-04-13 | Double gate valve non-resistance backflow preventer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114593224B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2229121A1 (en) * | 1972-06-15 | 1974-01-10 | Hans Schroeder | Back-flooding block valve - to prevent reverse flow in a drainage channel esp from cellar |
| JP2003014147A (en) * | 2001-06-27 | 2003-01-15 | Maezawa Kyuso Industries Co Ltd | Pressure reduction type reverse flow preventing device and check valve |
| CN2608788Y (en) * | 2003-03-25 | 2004-03-31 | 浙江大众阀门厂 | Multifunctional waterpower control valve |
| US20070240765A1 (en) * | 2004-07-21 | 2007-10-18 | A.R.I. Flow Control Accessories Agricultural Coope | Backflow Preventer |
| CN103821969A (en) * | 2014-01-28 | 2014-05-28 | 何际跃 | Follow-up backflow preventer |
| CN211820884U (en) * | 2019-11-29 | 2020-10-30 | 罗兰自控阀业（上海）有限公司 | Non-pressure loss backflow preventer |
| CN215673674U (en) * | 2021-07-18 | 2022-01-28 | 中恒水务科技有限公司 | Electric gate valve with backflow prevention control function |
-
2022
- 2022-04-13 CN CN202210382180.9A patent/CN114593224B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2229121A1 (en) * | 1972-06-15 | 1974-01-10 | Hans Schroeder | Back-flooding block valve - to prevent reverse flow in a drainage channel esp from cellar |
| JP2003014147A (en) * | 2001-06-27 | 2003-01-15 | Maezawa Kyuso Industries Co Ltd | Pressure reduction type reverse flow preventing device and check valve |
| CN2608788Y (en) * | 2003-03-25 | 2004-03-31 | 浙江大众阀门厂 | Multifunctional waterpower control valve |
| US20070240765A1 (en) * | 2004-07-21 | 2007-10-18 | A.R.I. Flow Control Accessories Agricultural Coope | Backflow Preventer |
| CN103821969A (en) * | 2014-01-28 | 2014-05-28 | 何际跃 | Follow-up backflow preventer |
| CN211820884U (en) * | 2019-11-29 | 2020-10-30 | 罗兰自控阀业（上海）有限公司 | Non-pressure loss backflow preventer |
| CN215673674U (en) * | 2021-07-18 | 2022-01-28 | 中恒水务科技有限公司 | Electric gate valve with backflow prevention control function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114593224B (en) | 2024-07-23 |
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