CN101676590A - Pressure release type backflow preventer - Google Patents
Pressure release type backflow preventer Download PDFInfo
- Publication number
- CN101676590A CN101676590A CN200810121213A CN200810121213A CN101676590A CN 101676590 A CN101676590 A CN 101676590A CN 200810121213 A CN200810121213 A CN 200810121213A CN 200810121213 A CN200810121213 A CN 200810121213A CN 101676590 A CN101676590 A CN 101676590A
- Authority
- CN
- China
- Prior art keywords
- valve
- piston body
- sluicing
- backflow preventer
- release type
- 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
Images
Landscapes
- Check Valves (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to a pressure release type backflow preventer which comprises a water inlet ball valve, a first-stage check valve, a second-stage check valve and a water outlet ball valve, wherein a bypass draining pressure reducing valve is installed between the first-stage check valve and the second-stage check valve and comprises a valve cover and a valve body. The backflow preventer is characterized in that a piston body which can move left and right is distributed inside an inner cavity of the draining pressure reducing valve and divides the inner cavity into a left cavity and a right cavity, wherein the left cavity is communicated with a master water inlet by a channel arranged on the valve cover of the draining pressure reducing valve, and the right cavity leads a water inletto be communicated with a water outlet of the draining pressure reducing valve by a ring-shaped seat; the circumferential surface of the piston body is distributed with a ring-shaped sealing ring which is used for realizing sliding seal with the wall surface of the inner cavity, and the right side of the piston body is provided with a gasket which is matched and sealed with the ring-shaped seat; and a spring is supported between the piston body and the ring-shaped seat. Therefore, the pressure release type backflow preventer has simple and reasonable structure, and is easy to produce and assemble.
Description
Technical field
The present invention relates to a kind of backflow preventer door device.
Background technique
In all kinds of water supply lines, at present the various safety check that use can not prevent effectively that all press water from flowing to main and backflow pollution takes place from arm is counter, especially in the water supply network of Drinking Water, backflow pollution has taken place people healthy brought serious harm.In flow, become the unsafe hidden danger of feed flow.
There are scientific and technical personnel to develop a kind of pressure release type backflow preventer for this reason, it is by water intake ball valve, the water outlet ball valve, the one-level safety check, the secondary safety check reaches with the sluicing reduction valve of its bypass to be formed, the sluicing reduction valve is installed between one-level safety check and the secondary safety check, concrete structure is seen Fig. 1, but the spool of move left and right is arranged in the inner chamber of sluicing reduction valve, spool adopts small piston and big piston to be formed by connecting with bolt, and small piston and big piston all are equipped with the barrier film pad, inner chamber is divided into left and right sides chamber, its defective is that valve core structure is succinct inadequately, and the barrier film difficulty of processing is big, and technology is difficult to be grasped, there is reaction strength, so require further improvement design.
Summary of the invention
Technical problem to be solved by this invention provide a kind of simple and reasonable, easy production and assembly pressure release type backflow preventer.
The technological scheme of technical solution problem of the present invention is such: a kind of pressure release type backflow preventer, it comprises the water intake ball valve that connects successively, the one-level safety check, secondary safety check and water outlet ball valve, the sluicing reduction valve of bypass is installed between one-level safety check and the secondary safety check, the sluicing reduction valve is divided into the valve gap of sluicing reduction valve and the valve body of sluicing reduction valve, but the piston body that it is characterized in that move left and right is arranged in the inner chamber of sluicing reduction valve and is divided into left chamber and right chamber, chamber, a left side is communicated with total water inlet by the passage on the valve gap of sluicing reduction valve, right chamber is communicated with by the water intake and the discharge opening of annular seating with the sluicing reduction valve, be distributed with O-ring seal and inner chamber wall on the piston body circumferential surface and realize slipper seal, the piston body right flank is furnished with sealing gasket and annular seating fitted seal, and is supported with spring between piston body and the annular seating.
Improve, described piston body right flank molds annular groove again, and sealing gasket also is an annular, is arranged in the annular groove, with screw with retaining washer is spacing fixes.
As preferably, described O-ring seal is set to twice.
At last, described piston body adopts etch-proof plastics manufacturing to form.
Compared with prior art, the invention has the advantages that: 1, replace spool, designs simplification with piston; 2, replace diaphragm seal with the O-ring seal radial seal, aseptate reaction force, designing and calculating is convenient, overcomes that the barrier film difficulty of processing is big, the difficult problem of the difficult grasp of technology, O-ring seal processing is simple, can adopt different materials processing and be applied to a plurality of fields such as chemical industry; 3, piston can adopt etch-proof plastics, and is easy to process, in light weight.
Description of drawings
Fig. 1 is a pressure release type backflow preventer structure sectional view of the present invention;
Fig. 2 is the sectional view of conventional construction.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As schematically shown in Figure 1, a kind of pressure release type backflow preventer, it comprises the water intake ball valve 1 that connects successively, one-level safety check 2, secondary safety check 3 and water outlet ball valve 4, the sluicing reduction valve 5 of bypass is installed between one-level safety check 2 and the secondary safety check 3, sluicing reduction valve 5 is divided into the valve gap 52 of sluicing reduction valve and the valve body 51 of sluicing reduction valve, but the piston body 53 of move left and right is arranged in the inner chamber of sluicing reduction valve and is divided into left chamber and right chamber, piston body 53 can adopt etch-proof plastics to make, chamber, a left side is communicated with total water inlet by the passage on the valve gap 52 of sluicing reduction valve, right chamber is communicated with by the water intake and the discharge opening of annular seating 54 with the sluicing reduction valve, have two annular grooves on piston body 53 circumferential surfacies, distribution O-ring seal 55 in each annular groove, realize slipper seal with the inner chamber wall, piston body 53 right flanks are made annular groove, the sealing gasket 56 of annular is arranged in the annular groove, the center is with screw 57 and the retaining washer 58 spacing sealing gaskets 56 of fixing, make sealing gasket 56 and annular seating 54 fitted seal, and be supported with spring 59 between piston body 53 and the annular seating 54.
Its working principle is such:
When 1, Dang Shui was in frequent flowing state, the current with P1 (inlet pressure) pressure were after the one-level safety check, because loss of head, pressure drops to P2, and flowed to the right chamber of drain valve bypass flow channel to drain valve; At this moment pressure differential deltap P=P1-P2 of the total existence in the chamber, the left and right sides of drain valve.The hydraulic pressure height overall of inlet is in the hydraulic pressure at water outlet place during proper flow, and water is very smooth in backflow preventer, and the flow size all can not flow backwards.At this moment the drain valve piston overcomes spring force under the effect of Δ P, makes sealing gasket contact with annular seating, and drain valve is in closed condition, does not sluice.
2, when being in dead head condition, one-level safety check and secondary safety check all are in closed condition.If the import water pressure invariableness is constant in design pressure, then drain valve piston body left side cavity pressure is still greater than right cavity pressure, and pressure differential deltap P is constant, and drain valve is in closed condition, and water can not flow backwards and leak.If import hydraulic pressure descends or because of the working conditions change downstream water presses liter, even the secondary safety check lost efficacy, and then Δ P just reduces thereupon, and when Δ P is little during to certain value, piston is under the effect of spring force, and to left movement, drain valve is opened and sluiced.
3, when being in the siphon state, no matter in any operating mode, when needing only import pressure of supply water P1 less than a certain numerical value, the sluicing reduction valve is necessarily opened, and carries out its air inlet, draining dual functions.And at this moment one-level safety check and secondary safety check all are in closed condition.If the rapid drawdown of import water pressure, and produce negative pressure (P1＜0), when siphon occurring, no matter whether two safety check leak, and drain valve can both be discharged water, and covers enough air, must not hand over anti-flowing water to suck the import main, has prevented backflow pollution reliably.Have only when Δ P reaches regulation numerical value, drain valve just cuts out and resets.
Claims (4)
1, a kind of pressure release type backflow preventer, it comprises the water intake ball valve that connects successively, the one-level safety check, secondary safety check and water outlet ball valve, the sluicing reduction valve of bypass is installed between one-level safety check and the secondary safety check, the sluicing reduction valve is divided into the valve gap of sluicing reduction valve and the valve body of sluicing reduction valve, but the piston body that it is characterized in that move left and right is arranged in the inner chamber of sluicing reduction valve and is divided into left chamber and right chamber, chamber, a left side is communicated with total water inlet by the passage on the valve gap of sluicing reduction valve, right chamber is communicated with by the water intake and the discharge opening of annular seating with the sluicing reduction valve, be distributed with O-ring seal and inner chamber wall on the piston body circumferential surface and realize slipper seal, the piston body right flank is furnished with sealing gasket and annular seating fitted seal, and is supported with spring between piston body and the annular seating.
2, pressure release type backflow preventer according to claim 1 is characterized in that described piston body right flank molds annular groove, and sealing gasket also is an annular, is arranged in the annular groove, with screw with retaining washer is spacing fixes.
3, pressure release type backflow preventer according to claim 1 is characterized in that described O-ring seal is set to twice.
4, pressure release type backflow preventer according to claim 1 is characterized in that described piston body adopts etch-proof plastics manufacturing to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810121213A CN101676590A (en) | 2008-09-17 | 2008-09-17 | Pressure release type backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810121213A CN101676590A (en) | 2008-09-17 | 2008-09-17 | Pressure release type backflow preventer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101676590A true CN101676590A (en) | 2010-03-24 |
Family
ID=42029258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810121213A Pending CN101676590A (en) | 2008-09-17 | 2008-09-17 | Pressure release type backflow preventer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101676590A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042430A (en) * | 2010-12-03 | 2011-05-04 | 浙江盾安阀门有限公司 | Pressure-reducing backflow preventer |
| CN103423485A (en) * | 2013-07-30 | 2013-12-04 | 王树 | Multifunctional safety valve |
| CN105927767A (en) * | 2016-07-28 | 2016-09-07 | 广东永泉阀门科技有限公司 | Novel low-resistance backflow preventer |
| CN107208406A (en) * | 2015-02-10 | 2017-09-26 | 卡莱菲公司 | Backflow preventer for distribution apparatus |
| CN109519570A (en) * | 2019-01-04 | 2019-03-26 | 无锡威孚高科技集团股份有限公司 | Check valve for SCR urea pump |
| CN109812602A (en) * | 2019-01-29 | 2019-05-28 | 淮南市众兴机械制造有限责任公司 | A kind of check valve for high-pressure fluid |
| CN109838595A (en) * | 2017-11-25 | 2019-06-04 | 杭州神林电子有限公司 | A kind of water feed apparatus with negative pressure elimination, anti-return and safety relief function |
| CN115289223A (en) * | 2022-08-10 | 2022-11-04 | 安徽中兴流体装备有限责任公司 | Multi-stage valve |
| CN115289223B (en) * | 2022-08-10 | 2024-06-11 | 安徽中兴流体装备有限责任公司 | Multistage valve |
-
2008
- 2008-09-17 CN CN200810121213A patent/CN101676590A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042430B (en) * | 2010-12-03 | 2012-07-04 | 浙江盾安阀门有限公司 | Pressure-reducing backflow preventer |
| CN102042430A (en) * | 2010-12-03 | 2011-05-04 | 浙江盾安阀门有限公司 | Pressure-reducing backflow preventer |
| CN103423485A (en) * | 2013-07-30 | 2013-12-04 | 王树 | Multifunctional safety valve |
| CN103423485B (en) * | 2013-07-30 | 2016-02-03 | 王树 | A kind of multifunctional safety valve |
| CN107208406A (en) * | 2015-02-10 | 2017-09-26 | 卡莱菲公司 | Backflow preventer for distribution apparatus |
| CN105927767A (en) * | 2016-07-28 | 2016-09-07 | 广东永泉阀门科技有限公司 | Novel low-resistance backflow preventer |
| CN109838595A (en) * | 2017-11-25 | 2019-06-04 | 杭州神林电子有限公司 | A kind of water feed apparatus with negative pressure elimination, anti-return and safety relief function |
| CN109519570A (en) * | 2019-01-04 | 2019-03-26 | 无锡威孚高科技集团股份有限公司 | Check valve for SCR urea pump |
| CN109519570B (en) * | 2019-01-04 | 2023-09-08 | 无锡威孚高科技集团股份有限公司 | Check valve for SCR urea pump |
| CN109812602A (en) * | 2019-01-29 | 2019-05-28 | 淮南市众兴机械制造有限责任公司 | A kind of check valve for high-pressure fluid |
| CN109812602B (en) * | 2019-01-29 | 2021-08-24 | 淮南市众兴机械制造有限责任公司 | One-way valve for high-pressure fluid |
| CN115289223A (en) * | 2022-08-10 | 2022-11-04 | 安徽中兴流体装备有限责任公司 | Multi-stage valve |
| CN115289223B (en) * | 2022-08-10 | 2024-06-11 | 安徽中兴流体装备有限责任公司 | Multistage valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101676590A (en) | Pressure release type backflow preventer | |
| CN104563224B (en) | Sanitary water faucet | |
| CN101936412A (en) | Right-angle backflow preventer | |
| CN101766927A (en) | High-pressure and high-precision backwashing filtration station | |
| CN202597807U (en) | Copper-plastic composite decompression type backflow preventer | |
| WO2012122809A1 (en) | Maglev intelligent valve | |
| CN201613055U (en) | High-pressure high-precision backflushing filter station | |
| CN201651452U (en) | Two-stage check valve | |
| CN201651443U (en) | Double non-return backflow preventer | |
| CN105370924B (en) | Side valve type pressure reduction type backflow preventer | |
| CN203098996U (en) | Filtering type pressure-reducing valve | |
| CN205781131U (en) | Micro-resistance pressure reduction type backflow preventer | |
| CN102128273A (en) | Fire hydrant rapid valve | |
| CN201705989U (en) | Faucet with double water channels | |
| CN201221629Y (en) | Built-in drain type backflow preventer | |
| CN102042430B (en) | Pressure-reducing backflow preventer | |
| CN201739574U (en) | Right angle type backflow preventing device | |
| CN202706989U (en) | Pressure regulating air vent valve | |
| CN201916551U (en) | Pressure reducing type backflow preventer | |
| CN212296812U (en) | Multi-working-cavity oil well pump with full-stroke liquid feeding function | |
| CN202001671U (en) | Right-angled pressure reduction type backflow preventer | |
| CN201016329Y (en) | Adjustable combination valve hydraulic force balancing pump head | |
| CN201818851U (en) | Backflow preventer with failure transmitting device | |
| CN202132558U (en) | Built-in filter screen and backflow preventer without built-out piping | |
| CN201057305Y (en) | Combined valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100324 |