CN103982682A - Online-maintained backflow preventer - Google Patents
Online-maintained backflow preventer Download PDFInfo
- Publication number
- CN103982682A CN103982682A CN201410226368.XA CN201410226368A CN103982682A CN 103982682 A CN103982682 A CN 103982682A CN 201410226368 A CN201410226368 A CN 201410226368A CN 103982682 A CN103982682 A CN 103982682A
- Authority
- CN
- China
- Prior art keywords
- valve
- drain valve
- drain
- backflow preventer
- valve plate
- 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.)
- Granted
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
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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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
- F16K11/22—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members with an actuating member for each valve, e.g. interconnected to form multiple-way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention provides an online-maintained backflow preventer. The online-maintained backflow preventer comprises a casing provided with a water inlet valve, a water outlet valve and a drain valve. The inside of the drain valve is divided into an inner cavity and an outer cavity through a diaphragm; the inner cavity is communicated with a cavity between a first valve plate and a second valve plate through a channel on the casing; the outer cavity is communicated with an internal cavity of the casing. The drain valve is fixed inside the casing, and a drain valve seat is mounted under the drain valve; one end of a drain valve stem component is movably mounted in the drain valve seat, and the other end of the drain valve stem component plugs a drain outlet through a drain valve plate; a drain resetting device is arranged on a drain valve stem which penetrates the diaphragm in the drain valve and is fixed with the same. The water inlet valve, the water outlet valve and the drain valve can be removed freely; the casing is provided with an access hole. The online-maintained backflow preventer has the advantages that water waste caused by draining due to unstable water pressure is avoided and online maintenance is achieved.
Description
Technical field
The invention belongs to field of check valves, especially relates to a kind of on-bne repair backflow preventer.
Background technique
Municipal water supply pressure transient at present, cause the water intake pressure of backflow preventer can produce fluctuation, in the time that inlet pressure undulating value is greater than the drain valve starting differential pressure value Δ p of backflow preventer, the discharge opening of general backflow preventing structure can be opened to reduce middle pressure and meet Δ p value, in use can there is interrupted sluicing phenomenon when water (particularly in backflow preventer downstream not) in backflow preventer like this, causes the waste of water resources.This just needs a kind of structure, in the time of normal water supply when when fluctuation occurs water intake pressure, can prevent intermittently opening of drain valve, release refluence water when medium occurs to flow backwards and backflow preventer water inlet safety check damages or can open rapidly drain valve when poorly sealed simultaneously, effectively prevent from that water quality from flowing backwards to enter water supply network.And current backflow preventer can not be realized on-bne repair, bring inconvenience to maintenance afterwards.
Summary of the invention
The problem that the invention will solve is to avoid in the time that pressure of supply water fluctuates, and drain valve is opened automatically, cuts the waste, and realizes on-bne repair.
For solving the problems of the technologies described above, the technological scheme that the invention adopts is: a kind of on-bne repair backflow preventer, comprise housing, described housing is provided with water intake, water outlet and discharge opening, and correspondence is provided with inlet valve, outlet valve and drain valve, described inlet valve comprises valve plate I and valve plate II, point two-stage seals described water intake, in described drain valve, be divided into inner chamber and exocoel by diaphragm, described inner chamber is communicated with the cavity between described valve plate I and valve plate II by the passage on described housing, described exocoel is communicated with the cavity of described enclosure interior.
Described drain valve is fixed on enclosure interior, described drain valve inside comprises drain valve seat, sluicing valve rod assembly and sluicing resetting means, described drain valve seat is arranged on the bottom of described drain valve, one end of described sluicing valve rod assembly is movably arranged on described drain valve seat, its the other end seals discharge opening by drain valve valve plate, on described sluicing valve rod, be provided with sluicing resetting means, described sluicing valve rod passes the diaphragm in described drain valve, and fixing with it.
Described inlet valve also comprises inlet valve seat, water inlet valve rod and water inlet resetting means, one end of described water inlet valve rod is successively through described water inlet resetting means, inlet valve seat, valve plate I and valve plate II, described valve plate II is fixedly connected with described water inlet valve rod, described valve plate I is flexibly connected with described water inlet valve rod, between described valve plate II and described valve plate I, be provided with elastic device, described water inlet resetting means is connected with the inlet valve seat being fixed on described housing.
On described housing, be also provided with access hole, described access hole is connected sealing with valve gap by bolt.
Described inlet valve, outlet valve and drain valve can freely be dismantled.
On described drain valve, be also provided with draw ring or handle, so that dismounting.
Described diaphragm is rolling diaphragm.
Advantage and good effect that the invention has are:
Owing to adopting technique scheme, inlet valve is provided with two valve plates, when normal water supply and backflow preventer downstream are dead head condition, now two valve plates of inlet valve are all in closed condition, lead to the channel enclosed of cavity between described valve plate I and valve plate II, inner chamber becomes an airtight cavity, and pressure is P2.When outlet valve damages, the chamber pressure P3 of enclosure interior equals the pressure P 4 of water outlet, in the time that water outlet pressure rises for a certain reason, intake pressure P1 rises relatively, be that Δ P=(P1-P3) reduces, in the time that two valve plates of inlet valve are intact and there is no jam, inner chamber is airtight cavity, drain valve, in closed condition, can not sluice, and prevents the waste of water resources; When any valve plate of inlet valve is damaged or jam and when water quality occurs flowing backwards, inner chamber is communicated with the cavity of water intake or enclosure interior, refluence water is released in drain valve unlatching in time, has avoided the pollution of refluence water quality to water inlet water quality.
In like manner, if water intake pressure reduces for a certain reason or when decompression, Δ P reduces or become negative value, in the time that two valve plates of inlet valve are intact and there is no jam, inner chamber is airtight cavity, and drain valve, in closed condition, can not sluice, and prevents the waste of water resources; When any valve plate of inlet valve is damaged or jam and when water quality occurs flowing backwards, inner chamber is communicated with the cavity of water intake or enclosure interior, refluence water is released in drain valve unlatching in time, has avoided the pollution of refluence water quality to water inlet water quality.
And have access hole, inlet valve, outlet valve and drain valve can freely be dismantled, and facilitate on-bne repair.Built-in being also not easy of drain valve is damaged, life-saving.
Brief description of the drawings
Fig. 1 is the structural representation of the invention;
Fig. 2 is the structural representation of drain valve in the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the invention is elaborated.
The invention comprises housing, described housing is provided with water intake, water outlet and discharge opening, and correspondence is provided with inlet valve 1, outlet valve 2 and drain valve 3, described inlet valve 1 comprises valve plate I 11 and valve plate II 12, point two-stage seals described water intake, in described drain valve 3, be divided into inner chamber 31 and exocoel 32 by diaphragm, described inner chamber 31 is communicated with the cavity between described valve plate I 11 and valve plate II 12 by the passage on described housing, described exocoel 32 is communicated with the cavity of described enclosure interior
Described drain valve 3 is fixed on enclosure interior, described drain valve 3 inside comprise drain valve seat 33, sluicing valve rod assembly 34 and sluicing resetting means, described drain valve seat 33 is arranged on the bottom of described drain valve, one end of described sluicing valve rod assembly 34 is movably arranged on described drain valve seat 33, its the other end seals discharge opening by drain valve valve plate, on described sluicing valve rod 34, be provided with sluicing resetting means, the diaphragm that described sluicing valve rod 34 passes in described drain valve 3, and fixing with it.
Described inlet valve 1 also comprises inlet valve seat, water inlet valve rod and water inlet resetting means, one end of described water inlet valve rod is successively through described water inlet resetting means, inlet valve seat, valve plate I 11 and valve plate II 12, described valve plate II 12 is fixedly connected with described water inlet valve rod, described valve plate I 11 is flexibly connected with described water inlet valve rod, between described valve plate II 12 and described valve plate I 11, be provided with elastic device, described water inlet resetting means is connected with the inlet valve seat being fixed on described housing.
On described housing, be also provided with access hole 4, described access hole 4 is connected sealing with valve gap by bolt.
Described drain valve 3 is stuck on housing by fixing devices such as snap rings, can freely dismantle, and also be provided with draw ring or handle on described drain valve 3, so that dismounting.Described inlet valve 1, outlet valve 2 are also demountable structures.
Described diaphragm is rolling diaphragm, can save space.
When normal water inlet, pressure of supply water P1 orders about described valve plate I 11 activities, make water enter inner chamber 31 by passage, push down diaphragm, cause described drain valve 3 to be closed, along with the increase of intake pressure, press water is pushed described valve plate II 12 open, water normally passes through backflow preventer, described drain valve 3 cuts out and does not sluice, and now water intake pressure P 1 equals chamber pressure P2, has a pressure difference Δ P between the pressure P 3 of the cavity of P1 and enclosure interior, in the time of P1-P3> Δ P, drain valve cuts out, and in the time of P1-P3≤Δ P, drain valve is opened.
When backflow preventer is in the time that dead head condition and water intake decompression or water intake pressure produce fluctuation, described valve plate I 11 and valve plate II 12 are all in closed condition, described inner chamber 31 is air-tight state, and the interior medium of described inner chamber 31 can not pass in and out, and described drain valve 3 is in closed condition.
When described outlet valve damages or because other situations are while occurring to flow backwards, the chamber pressure P3 of enclosure interior increases, if now valve plate I 11 and valve plate II 12 do not have jam or damage, drain valve 3 is in closed condition, and drain valve 3 can not opened sluicing; If valve plate I 11 and valve plate II 12 have jam or damage, when P1-P3< Δ p, drain valve 3 will be opened, and sluices.
The invention can realize, and in water inlet process, in the situation that pressure of supply water P1 fluctuates, drain valve, also at the state of cutting out, prevents the waste of water resources; And in the time occurring to flow backwards, can sluice in time, avoid the pollution to water inlet water quality.
Above the invention embodiment is had been described in detail, but described content is only for the preferred embodiment of the invention, can not be considered to the practical range for limiting the invention.All equalization variation and improvement etc. of doing according to the invention application range, within all should still belonging to the patent covering scope of the invention.
Claims (7)
1. an on-bne repair backflow preventer, comprise housing, described housing is provided with water intake, water outlet and discharge opening, and correspondence is provided with inlet valve (1), outlet valve (2) and drain valve (3), it is characterized in that: described inlet valve (1) comprises valve plate I (11) and valve plate II (12), point two-stage seals described water intake, in described drain valve (3), be divided into inner chamber (31) and exocoel (32) by diaphragm, described inner chamber (31) is communicated with the cavity between described valve plate I (11) and valve plate II (12) by the passage on described housing, described exocoel (32) is communicated with the cavity of described enclosure interior.
2. on-bne repair backflow preventer according to claim 1, it is characterized in that: described drain valve (3) is fixed on enclosure interior, described drain valve (3) inside comprises drain valve seat (33), sluicing valve rod assembly (34) and sluicing resetting means, described drain valve seat (33) is arranged on the bottom of described drain valve, one end of described sluicing valve rod assembly (34) is movably arranged on described drain valve seat (33), its the other end seals discharge opening by drain valve valve plate, on described sluicing valve rod (34), be provided with sluicing resetting means, described sluicing valve rod (34) is through the diaphragm in described drain valve (3), and fixing with it.
3. on-bne repair backflow preventer according to claim 1 and 2, it is characterized in that: described inlet valve (1) also comprises inlet valve seat, water inlet valve rod and water inlet resetting means, one end of described water inlet valve rod is successively through described water inlet resetting means, inlet valve seat, valve plate I (11) and valve plate II (12), described valve plate II (12) is fixedly connected with described water inlet valve rod, described valve plate I (11) is flexibly connected with described water inlet valve rod, between described valve plate II (12) and described valve plate I (11), be provided with elastic device, described water inlet resetting means is connected with the inlet valve seat being fixed on described housing.
4. on-bne repair backflow preventer according to claim 1 and 2, is characterized in that: on described housing, be also provided with access hole (4), described access hole (4) is connected sealing with valve gap by bolt.
5. on-bne repair backflow preventer according to claim 1 and 2, is characterized in that: described inlet valve (1), outlet valve (2) and drain valve (3) can freely be dismantled.
6. on-bne repair backflow preventer according to claim 5, is characterized in that: described drain valve is also provided with draw ring or handle on (3), so that dismounting.
7. on-bne repair backflow preventer according to claim 1 and 2, is characterized in that: described diaphragm is rolling diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410226368.XA CN103982682B (en) | 2014-05-26 | 2014-05-26 | A kind of on-bne repair backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410226368.XA CN103982682B (en) | 2014-05-26 | 2014-05-26 | A kind of on-bne repair backflow preventer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103982682A true CN103982682A (en) | 2014-08-13 |
| CN103982682B CN103982682B (en) | 2016-07-06 |
Family
ID=51274770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410226368.XA Active CN103982682B (en) | 2014-05-26 | 2014-05-26 | A kind of on-bne repair backflow preventer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103982682B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987207A (en) * | 2016-05-27 | 2016-10-05 | 杭州春江阀门有限公司 | Pressure relief type backflow prevention device with tiny resistance |
| CN109027331A (en) * | 2018-10-30 | 2018-12-18 | 天津市塘沽第阀门有限公司 | A kind of backflow preventer inlet valve with damage self-checking function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4553907A (en) * | 1981-09-17 | 1985-11-19 | Wabco Fahrzeugbremsen Gmbh | Unloading mechanisms for air compressors |
| CN1260448A (en) * | 1999-01-14 | 2000-07-19 | Abb阿尔斯托姆电力(瑞士)股份有限公司 | Flat gate valve |
| CN103511686A (en) * | 2013-09-17 | 2014-01-15 | 天津市倒流防止器制造有限公司 | Backflow preventing device structure |
| CN203979531U (en) * | 2014-05-26 | 2014-12-03 | 天津市国威给排水设备制造有限公司 | A kind of on-bne repair backflow preventer |
-
2014
- 2014-05-26 CN CN201410226368.XA patent/CN103982682B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4553907A (en) * | 1981-09-17 | 1985-11-19 | Wabco Fahrzeugbremsen Gmbh | Unloading mechanisms for air compressors |
| CN1260448A (en) * | 1999-01-14 | 2000-07-19 | Abb阿尔斯托姆电力(瑞士)股份有限公司 | Flat gate valve |
| CN103511686A (en) * | 2013-09-17 | 2014-01-15 | 天津市倒流防止器制造有限公司 | Backflow preventing device structure |
| CN203979531U (en) * | 2014-05-26 | 2014-12-03 | 天津市国威给排水设备制造有限公司 | A kind of on-bne repair backflow preventer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987207A (en) * | 2016-05-27 | 2016-10-05 | 杭州春江阀门有限公司 | Pressure relief type backflow prevention device with tiny resistance |
| CN109027331A (en) * | 2018-10-30 | 2018-12-18 | 天津市塘沽第阀门有限公司 | A kind of backflow preventer inlet valve with damage self-checking function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103982682B (en) | 2016-07-06 |
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