CN203477487U - Novel backflow preventer structure - Google Patents
Novel backflow preventer structure Download PDFInfo
- Publication number
- CN203477487U CN203477487U CN201320580540.2U CN201320580540U CN203477487U CN 203477487 U CN203477487 U CN 203477487U CN 201320580540 U CN201320580540 U CN 201320580540U CN 203477487 U CN203477487 U CN 203477487U
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- China
- Prior art keywords
- valve
- water
- main
- sealing device
- elastic sealing
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- Withdrawn - After Issue
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- Fluid-Driven Valves (AREA)
Abstract
The utility model provides a novel backflow preventer structure. The novel backflow preventer structure comprises a shell, a water inlet valve, a water outlet valve, a water escape valve, a main valve rod and an elastic sealing device, wherein the water inlet valve, the water outlet valve, the water escape valve and the main valve rod are arranged inside the shell, the interior of the shell is divided into a main cavity and a control cavity by the elastic sealing device, a water inlet, a water outlet and a drain opening are formed in the shell wall of the main cavity, the water inlet valve, the water outlet valve and the water escape valve are installed at the position of the water inlet, the position of the water outlet and the position of the drain opening respectively, one end of the main valve rod is connected with the water escape valve, and the other end of the main valve rod is connected with the elastic sealing device. Due to the adoption of the technical scheme, the novel backflow preventer structure has the advantages that two valve plates are arranged on the water inlet, in a zero flow state during water supply, the control cavity is in an airtight state when water supply pressure fluctuates, the water escape valve is located in a position where the water escape valve is closed, and therefore waste of water resources is avoided; in addition, water can be discharged in time when any one of the valve plates is broken and backflow occurs, and water in the water inlet is prevented from being polluted.
Description
Technical field
The utility model relates to field of check valves, especially relates to a kind of novel reverse flow preventing device structure.
Background technique
Current municipal water supply pressure transient, cause the water intake pressure of backflow preventer can produce fluctuation, when 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 is not the sole mass problem of product, but municipal water supply working condition pressure changing value surpasses backflow preventer drain valve, opens settings, causes the unlatching of backflow preventer drain valve to cause.Therefore a lot of water utilities all refuse to use to backflow preventer, and one of reason is exactly to dislike water waste serious.If can not fundamentally not guarantee that again water quality is not polluted but do not install backflow preventer additional, this just needs a kind of structure, when normal water supply when there is fluctuation in water intake pressure, can prevent intermittently opening of drain valve, when medium occur to flow backwards and backflow preventer water inlet safety check damages or can open rapidly drain valve when poorly sealed, release refluence water simultaneously, effectively prevent from that water quality from flowing backwards to enter water supply network.
Model utility content
The purpose of this utility model is to provide a kind of simple in structure, safe and reliable backflow preventer structure.
The technical solution of the utility model is: a kind of novel reverse flow preventing device structure, comprise housing and the inlet valve that is positioned at described enclosure interior, outlet valve, drain valve and main valve stem, also comprise elastic sealing device, described elastic sealing device is divided into main chamber and two cavitys of control chamber by described enclosure interior, wherein on the shell wall in main chamber with water intake, these three openings of water outlet and discharge opening, described inlet valve, outlet valve and drain valve are arranged on respectively this three openings, one end of described main valve stem is connected with described drain valve, the other end is connected with described elastic sealing device,
Described housing is provided with passage I, and described passage I is communicated with described control chamber with described water intake, and described passage I is connecting port in the outlet at described water intake inwall place;
Described inlet valve is provided with seal arrangement A and B, described water intake is sealed, and lay respectively at the front and back position of described connecting port;
As water inlet hydraulic pressure P1>0 and while being less than setting value, only have described seal arrangement A to open, when P1>=setting value, described seal arrangement A and B open.
Advantage and the good effect that the utlity model has are:
Owing to adopting technique scheme, inlet valve is provided with seal arrangement A and B, when normal water supply and backflow preventer downstream are dead head condition, now seal arrangement A and B are all in closed condition, seal arrangement A is by the sealing of passage I, and control chamber becomes an airtight cavity, and pressure is P2.When outlet valve damages, main cavity pressure P3 equals the pressure P 4 of water outlet, when water outlet pressure rises for a certain reason, intake pressure P1 rises relatively, be that Δ P=(P1-P3) reduces, when inlet valve seal arrangement A and B is intact and while there is no jam control chamber be airtight cavity, main valve stem can not move upward, drain valve is in closed condition, can not sluice, prevent the waste of water resources; When the device any sealing together of inlet valve is damaged or jam and when water quality occurring flowing backwards, control chamber is communicated with water intake or main chamber, main valve stem moves upward and drives drain valve unlatching to release in time refluence water, 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 during decompression, Δ P reduces or becomes negative value, when inlet valve seal arrangement A and B is intact and while there is no jam control chamber be airtight cavity, main valve stem can not move upward, be drain valve in closed condition, can not sluice, prevent the waste of water resources; When the device any sealing together of inlet valve is damaged or jam and when water quality occurring flowing backwards, control chamber is communicated with water intake or main chamber, main valve stem moves upward and drives drain valve unlatching to release in time refluence water, has avoided the pollution of refluence water quality to water inlet water quality.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of valve seat and valve plate joint in the utility model.
In figure:
1, outlet valve 2, drain valve 3, main valve stem 4, elastic sealing device
5, main chamber 6, control chamber 7, water intake 8, water outlet
9, discharge opening 10, passage I 101, valve seat 102, valve rod
103, valve plate I 104, valve plate II 105, resetting means
Embodiment
Below in conjunction with the drawings and the specific embodiments, the utility model is described in further detail.
As depicted in figs. 1 and 2, the utility model comprises housing and is positioned at inlet valve, outlet valve 1, drain valve 2 and the main valve stem 3 of described enclosure interior, also comprise elastic sealing device 4, described elastic sealing device 4 is divided into main chamber 5 and 6 two cavitys of control chamber by described enclosure interior, wherein on the shell wall in main chamber 5 with water intake 7, water outlet 8 and discharge opening 9 these three openings, described inlet valve, outlet valve 1 and drain valve 2 are arranged on respectively this three openings, one end of described main valve stem 3 is connected with described drain valve 2, and the other end is connected with described elastic sealing device 4; Described elastic sealing device 4 is elastomer diaphragm.、
Described seal arrangement A is valve plate I 103, and described seal arrangement B is valve plate II 104.
Described inlet valve comprises valve seat 101, valve rod 102, valve plate I 103, valve plate II 104 and resetting means 105, one end of described valve rod 102 is successively through described resetting means 105, valve seat 101, valve plate I 103 and valve plate II 104, described valve plate II 104 is fixedly connected with described valve rod 102, described valve plate I 103 is flexibly connected with described valve rod 102, between described valve plate II 104 and described valve plate I 103, be provided with elastic device 106, described resetting means 105 is connected with the valve seat 101 being fixed on described housing;
Described resetting means 105 be end cap and and spring, described end cap is fixed on the other end of described valve rod 102, one end of described spring props up described end cap, the other end is fixed on described valve seat 101.
The elastic device 106 arranging between described valve plate II 104 and described valve plate I 103 is several little springs.
Described housing is provided with passage I 10, and described passage I 10 is communicated with described control chamber 6 with described water intake 7, and described passage I 10 is positioned on described valve seat 101 at the opening at described water intake 7 places, and described valve plate I 103 seals it when not being stressed;
Described valve plate II 104 seals described water intake 7 when not being stressed.
The inner chamber of described valve seat 101 has place's step, described valve plate I 103 is stuck in described step place, and described valve seat 101 is provided with a circle projection I with the step of described valve plate I 103 outer side contacts, when described valve plate I 103 contacts with protruding I, can play sealing effect, gapped between described valve plate I 103 and the inwall of described valve seat 101, one side contacts of the bottom of described valve seat 101 and described valve plate II 104, and the bottom of described valve seat 101 is provided with a circle projection II, when described valve plate II 104 contacts with protruding II, can play sealing effect, the opening of described passage I 10 in described water inlet is positioned on described valve seat 101, and between described two circle projections.
During normal water inlet, it is movable to the right that pressure of supply water P1 orders about described valve plate I 103, open the passage II on described valve seat 101, make water enter control chamber 6, push down diaphragm, drive the action downwards of described main valve stem 3 to cause described drain valve 2 to be closed, increase along with intake pressure, press water is pushed described valve plate II 104 open, water normally passes through backflow preventer, described drain valve 2 cuts out and does not sluice, now water intake pressure P 1 equals control chamber pressure P 2, between pressure P 3 in P1 and main chamber, there is a pressure difference Δ P, when P1-P3> Δ P, drain valve cuts out, when P1-P3≤Δ P, drain valve is opened.
When backflow preventer is when dead head condition and water intake decompression or water intake pressure produce fluctuation, described valve plate I 103 and valve plate II 104 are all in closed condition, described passage II is sealed, described control chamber 6 is air-tight state, the interior medium of described control chamber 6 can not pass in and out, main valve stem 3 can not produce motion, and described drain valve 2 is in closed condition.
When described outlet valve 1 damages or because other situations are while occurring to flow backwards, main cavity pressure P3 increases, if now valve plate I 103 and valve plate II 104 do not have jam or damage, drain valve 2 is in closed condition, and drain valve can not opened sluicing; If valve plate I 103 and valve plate II 104 have jam or damage, during P1-P3< Δ p, described diaphragm moves upward and drives described main valve stem 3 to move up, and opens drain valve 2, sluices.
The utility model can be realized, 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 when occurring to flow backwards, can sluice in time, avoid the pollution to water inlet water quality.
Above embodiment has been described in detail the utility model, but described content is only preferred embodiment of the present utility model, can not be considered to for limiting practical range of the present utility model.All equalization variations of doing according to the utility model application range and improvement etc., within all should still belonging to patent covering scope of the present utility model.
Claims (1)
1. a novel reverse flow preventing device structure, comprise housing and the inlet valve that is positioned at described enclosure interior, outlet valve (1), drain valve (2) and main valve stem (3), it is characterized in that: also comprise elastic sealing device (4), described elastic sealing device (4) is divided into main chamber (5) and (6) two cavitys of control chamber by described enclosure interior, wherein on the shell wall of main chamber (5) with water intake (7), these three openings of water outlet (8) and discharge opening (9), described inlet valve, outlet valve (1) and drain valve (2) are arranged on respectively this three openings, one end of described main valve stem (3) is connected with described drain valve (2), the other end is connected with described elastic sealing device (4),
Described housing is provided with passage I (10), and described passage I (10) is communicated with described control chamber (6) with described water intake (7), and described passage I (10) is connecting port in the outlet at described water intake (7) inwall place;
Described inlet valve is provided with seal arrangement A and B, described water intake (7) is sealed, and lay respectively at the front and back position of described connecting port;
When water intake (7) is located hydraulic pressure P1>0 and is less than setting value, only have described seal arrangement A to open, when P1>=setting value, described seal arrangement A and B open.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320580540.2U CN203477487U (en) | 2013-09-17 | 2013-09-17 | Novel backflow preventer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320580540.2U CN203477487U (en) | 2013-09-17 | 2013-09-17 | Novel backflow preventer structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203477487U true CN203477487U (en) | 2014-03-12 |
Family
ID=50225818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320580540.2U Withdrawn - After Issue CN203477487U (en) | 2013-09-17 | 2013-09-17 | Novel backflow preventer structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203477487U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511687A (en) * | 2013-09-17 | 2014-01-15 | 天津市倒流防止器制造有限公司 | Novel backflow prevention device structure |
-
2013
- 2013-09-17 CN CN201320580540.2U patent/CN203477487U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511687A (en) * | 2013-09-17 | 2014-01-15 | 天津市倒流防止器制造有限公司 | Novel backflow prevention device structure |
| CN103511687B (en) * | 2013-09-17 | 2017-01-04 | 天津市倒流防止器制造有限公司 | A kind of Novel backflow prevention device structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20161019 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20161019 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |