CN202012642U - Novel backflow preventer - Google Patents
Novel backflow preventer Download PDFInfo
- Publication number
- CN202012642U CN202012642U CN 201120145935 CN201120145935U CN202012642U CN 202012642 U CN202012642 U CN 202012642U CN 201120145935 CN201120145935 CN 201120145935 CN 201120145935 U CN201120145935 U CN 201120145935U CN 202012642 U CN202012642 U CN 202012642U
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- CN
- China
- Prior art keywords
- valve
- axostylus axostyle
- cylindrical shell
- upstream
- reverse flow
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- 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.)
- Expired - Lifetime
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Abstract
The utility model relates to a novel backflow preventer, which is characterized in that a valve body consists of a barrel and a drain pipe, an upstream water inlet of the valve body is connected with a front valve cap, and an upstream water outlet of the valve body is connected with a rear valve cap. An inner hole of the barrel is slidingly provided with a slide valve capable of controlling on and off of the drain pipe, a first spring is arranged on the slide valve. An upstream tapered hole formed by the slide valve is matched with a first valve core to form an inlet check valve, and an upstream tapered hole formed by the rear valve cap is matched with a second valve core to form an outlet check valve. The barrel, the slide valve, the inlet check valve and the outlet check valve have the same center line. A drainer of the novel backflow preventer is arranged in a flow channel, therefore the novel backflow preventer is small in size, simple and reliable in structure, not only can be installed horizontally, but also can be installed vertically, and is not limited by pipe arrangement.
Description
Technical field
The utility model relates to a kind of valve, relates in particular to a kind of backflow preventer.
Background technique
Backflow preventer claims dirty stream isolating valve again, is the safety features of a kind of strictness polluted source when preventing that the Drinking Water pipeline from taking place to reflux, and also can be used for other and does not allow in pipe-line system that medium flows backwards.
The structural type of backflow preventer is more in the market, decompression type backflow preventer is owing to its function admirable, reliable operation, be widely adopted, its typical construction is represented in the patent application of publication number 2442057, is made up of inlet check valve, intermediate cavity, outlet non-return valve and plug-in drain valve.But, because its hydathode is plug-in, increased the complexity of volume and structure, brought inconvenience to maintaining; In addition, can only level install, can not vertically install, therefore use to be restricted.
Summary of the invention
The utility model mainly is to solve the existing in prior technology deficiency, thus develop a kind of volume less,
Simple in structure, service-strong novel reverse flow preventing device.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of novel reverse flow preventing device, it is characterized in that: have the valve body of forming by cylindrical shell and waste pipe, the upstream inlet end of described valve body is connected with preceding valve gap, and the downstream water outlet end is connected with the back valve gap; The endoporus of described cylindrical shell is equipped with the guiding valve that can control the waste pipe break-make, and described guiding valve is provided with spring one; The upstream taper hole that is formed by guiding valve cooperates with spool one forms inlet check valve, and the upstream taper hole that is formed by the back valve gap cooperates with spool two forms outlet non-return valve, and described cylindrical shell, guiding valve, inlet check valve, outlet non-return valve have same center line.
The technical solution of the utility model can also be further perfect:
As preferably, described spool one is spun together by axostylus axostyle one and flap one to be formed; Described axostylus axostyle one outside has and axostylus axostyle one sliding guide sleeve one of joining, and outside the described axostylus axostyle one spring two is arranged, and described flap one matches with the upstream taper hole.
As preferably, described spool two is spun together by axostylus axostyle two and flap two to be formed; Described axostylus axostyle two outsides have and axostylus axostyle two sliding guide sleeves two of joining, and outside the described axostylus axostyle two spring three are arranged, and described flap two matches with the upstream taper hole.
As preferably, the upstream extremity cylindrical of described cylindrical shell is provided with outside thread, and the corresponding internal thread with preceding valve gap of described outside thread screws; The downstream of described cylindrical shell is provided with flange, and described flange is connected with bolt with the respective aperture of back bonnet flange.
As preferably, the junction plane of described cylindrical shell two ends and preceding valve gap and back valve gap is provided with O-ring seals four and O-ring seals two, in case medium leaks.
As preferably, the endoporus of cylindrical shell and the guiding valve cunning place of joining are provided with O-ring seals three by the weep hole updrift side.
As preferably, the upstream extremity of described back valve gap has the protrusion platform, and the end face of described platform has groove, in the described groove with screw, packing ring fastening sealing gasket, described sealing gasket matches with the annular sword limit of guiding valve end face, the formation drain valve.
As preferably, the axostylus axostyle of described spool adopts stainless steel, and flap adopts teflon.
The beneficial effects of the utility model are:
1, hydathode is not taked plug-in mode, and is arranged in the runner, so volume is less, simple in structure;
2, reliable in structure, under the why not sharp operating mode in office, even all destroyeds of the sealing of two safety check, the danger at the medium pollution water source that can both prevent from effectively to flow backwards;
3, can level install, can vertically install again, be not subjected to the pipeline arrangement constraints.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of the present utility model.
Description of reference numerals: 1, preceding valve gap, 3, O-ring seals one, 4, Ge Laiquan, 5, spring one, 6, guiding valve, 7, spring two, 8, valve body, 9, guide sleeve one, 10, jump ring one, 11, jump ring two, 12, back valve gap, 13, spring three, 14, guide sleeve two, 15, jump ring three, 16, O-ring seals two, 17, sealing gasket, 18, O-ring seals three, 19, O-ring seals four, 21, spool one, 22, spool two, P1, snout cavity pressures, P2, intermediate cavity pressure, P3, outlet plenum pressure, L, weep hole.
Embodiment
Below by embodiment also in conjunction with the accompanying drawings, the technical solution of the utility model is further described in detail.
Embodiment:
Valve body 8 is made up of cylindrical shell and waste pipe, and waste pipe is arranged on the below of cylindrical shell, and the upper end of waste pipe is a rectangular, and the lower end is circular.The upstream extremity cylindrical of cylindrical shell is provided with outside thread, screws with preceding valve gap 1 corresponding internal thread.The adjacent outside thread of cylindrical shell is provided with boss, and the boss top is provided with the screw of setting pressure table ball valve.The downstream of cylindrical shell is provided with flange, is connected with bolt with the respective aperture of back valve gap 12 flanges.The junction plane at valve body 8 two ends is provided with O-ring seals 4 19 and O-ring seals 2 16, in case medium leaks; And be equipped with seam, coaxial with two pilot holes that guarantee water inlet and osculum and guiding valve 6.The endoporus of cylindrical shell and 6 sliding joining of guiding valve, play the guiding role; The sliding place of joining is provided with O-ring seals 3 18 by the weep hole updrift side, in case medium is bled into weep hole from intermediate cavity.Cylindrical shell endoporus upstream extremity has an omoplate, as the spring seat of spring 1.
The other end of preceding valve gap 1 and back valve gap 12 is provided with flange, connect intake pipe and outlet conduit respectively, be equipped with the screw of setting pressure table ball valve near the flange the boss, with above-mentioned pressure gauge, in order to when testing, to measure the hydraulic pressure of water-inlet cavity, intermediate cavity and water chamber.Back valve gap 12 upstream extremities protrude in the groove of platform with screw, packing ring fastening sealing gasket 17, as the valve seat of drain valve.Be provided with outlet non-return valve in the reaming of downstream, outlet non-return valve is made up of corresponding taper hole, spool 2 22, O-ring seals 1, spring 3 13, guide sleeve 2 14, jump ring 2 11, the jump ring 3 15 of back valve gap 12.Spool 2 22 is spun together by the flap of stainless axostylus axostyle and teflon to be formed; O-ring seals 1 is in order to prevent leakage; Guide sleeve 2 14 is by jump ring 3 15 location; Jump ring 2 11 is deviate from from the hole of guide sleeve 2 14 when assembling in order to prevent spool 2 22; The tapering of spool 2 22 front end frustums is consistent with the taper hole of the valve seat that matches; The axostylus axostyle cunning of spool 2 22 fits in the endoporus of guide sleeve 2 14; Spring 3 13 is arranged between spool 2 22 and the guide sleeve 14, in order to guarantee reliable sealing, certain pretightening force is arranged after the installation, therefore under the situation of not water flowing, O-ring seals 1 is pressed on the corresponding taper hole all the time, because outlet non-return valve only seals, thus the stiffness K 3 of spring 3 13 a little less than.
The endoporus of preceding valve gap 1 downstream and the piston cunning of guiding valve 6 upstream extremities are joined, and play the guiding role, and enclose 4 prevention leakages and reduce frictional resistance with lattice; The shoulder of endoporus root is the contact of its corresponding end face when guiding valve 6 resets left, plays position-limiting action, weep hole L this moment standard-sized sheet just.
Guiding valve 6 is arranged in the inner chamber after preceding valve gap 1, valve body 8 and 12 assemblings of back valve gap, four center line unanimities, and guiding valve 6 can move freely along center line.Space between guiding valve 6 left sides and the preceding valve gap 1 is a water-inlet cavity, and the space between inlet check valve and the outlet non-return valve is an intermediate cavity, and the space in outlet non-return valve downstream is a water chamber.The upstream extremity of guiding valve 6 is a piston, and the right-hand member of piston is the spring seat of spring 1, and the rigidity of spring 1 is according to designing when (P1-P2) can make guiding valve 6 reset reliably during less than design load, and therefore when not water flowing, guiding valve 6 is in the upstream-most position.The middle part of guiding valve 6 has four holes, so that the right side of piston also is subjected to the effect of intermediate cavity pressure P 2.The annular sword limit that guiding valve 6 downstream are protruded is formed drain valve as the flap of drain valve with sealing gasket 17.Be provided with inlet check valve in the hollow cavity of guiding valve 6, the composition of inlet check valve is identical with outlet non-return valve with principle, what be worth proposition is because inlet check valve should seal, when water flowing, produce certain pressure reduction again, so that drain valve cuts out reliably, so its stiffness K 2 is big more a lot of than the stiffness K 3 of outlet non-return valve spring 3 13; And high approximately 30 ﹪ of the action hydraulic pressure of its pressure ratio guiding valve 6 of fetching boiling water.
Principle of the present utility model is:
Fig. 1 is the key plan of each part in the valve under the obstructed regimen condition, this moment the inlet/outlet closure of check ring, drain valve is opened, intermediate cavity communicates with weep hole.Medium enters water-inlet cavity after the water flowing, and water-inlet cavity pressure raises and since inlet check valve open hydraulic pressure P1 " than the action hydraulic pressure P1 ' height of guiding valve 6; so guiding valve 6 is under low hydraulic pressure; overcome spring one 5 pressure and move downstream, up to drain shut valve, intermediate cavity and weep hole partition.Hydraulic pressure continues to rise behind the drain shut valve, until inlet check valve is opened, then outlet non-return valve is opened, and supplies water downstream.Because P1 " ≈ 1.3P1 ', therefore when import hydraulic pressure fluctuateed within the specific limits, can not open by drain valve.
Following surface analysis prevents the function that flows backwards:
1, when the reduction of import hydraulic pressure, during (P1-P2) less than setting value, inlet check valve is closed, guiding valve 6 upstream moves under the promotion of spring 1, and drain valve is opened, and intermediate cavity communicates with weep hole, water in the intermediate cavity is discharged from weep hole, P2 reduces, and as (P1-P2) when returning to setting value, drain valve cuts out again.
2, fall very lowly or be zero when import hydraulic pressure, even when be negative value, guiding valve 6 upstream moves under the promotion of spring 1 fast, weep hole is all opened, and air enters intermediate cavity from weep hole L, forms the air partition, has prevented siphon refluence phenomenon.
3, in the normal water supply process, P3 raises suddenly when outlet hydraulic pressure, even when surpassing import hydraulic pressure P1, if this moment, the outlet non-return valve good seal then can not flow backwards, if seal break-off, or blocked by foreign material, high pressure reflow water directly enters intermediate cavity and promotes guiding valve 6 fast with spring 1 and upstream move, and drain valve is all opened, and the refluence medium is discharged from weep hole through intermediate cavity; If inlet check valve sealing this moment destroys simultaneously, because import hydraulic pressure is greater than the hydraulic pressure at weep hole place, and air entered intermediate cavity, and the water that therefore flows backwards can not flow into water-inlet cavity.
When 4, blocking when inlet check valve sealing heavy damage or by foreign material, inlet check valve in opened condition, water inlet need not overcome the pressure of spring 27 and directly enter intermediate cavity and discharge from weep hole.Should stop this moment supplying water, backflow preventer is overhauled.
From above analysis as can be known, under the utility model why not sharp operating mode in office, even all destroyeds of the sealing of two safety check, the danger at the medium pollution water source that can both prevent from effectively to flow backwards.
Claims (8)
1. novel reverse flow preventing device, it is characterized in that: have the valve body of being made up of cylindrical shell and waste pipe, the upstream inlet end of described valve body is connected with preceding valve gap, and the downstream water outlet end is connected with the back valve gap; The endoporus of described cylindrical shell is equipped with the guiding valve that can control the waste pipe break-make, and described guiding valve is provided with spring one; The upstream taper hole that is formed by guiding valve cooperates with spool one forms inlet check valve, and the upstream taper hole that is formed by the back valve gap cooperates with spool two forms outlet non-return valve, and described cylindrical shell, guiding valve, inlet check valve, outlet non-return valve have same center line.
2. novel reverse flow preventing device according to claim 1 is characterized in that: described spool one is spun together by axostylus axostyle one and flap one to be formed; Described axostylus axostyle one outside has and axostylus axostyle one sliding guide sleeve one of joining, and outside the described axostylus axostyle one spring two is arranged, and described flap one matches with the upstream taper hole.
3. novel reverse flow preventing device according to claim 1 is characterized in that: described spool two is spun together by axostylus axostyle two and flap two to be formed; Described axostylus axostyle two outsides have and axostylus axostyle two sliding guide sleeves two of joining, and outside the described axostylus axostyle two spring three are arranged, and described flap two matches with the upstream taper hole.
4. according to claim 1 or 2 or 3 described novel reverse flow preventing devices, it is characterized in that: the upstream extremity cylindrical of described cylindrical shell is provided with outside thread, and the corresponding internal thread with preceding valve gap of described outside thread screws; The downstream of described cylindrical shell is provided with flange, and described flange is connected with bolt with the respective aperture of back bonnet flange.
5. according to claim 1 or 2 or 3 described novel reverse flow preventing devices, it is characterized in that: the junction plane of described cylindrical shell two ends and preceding valve gap and back valve gap is provided with O-ring seals four and O-ring seals two.
6. according to claim 1 or 2 or 3 described novel reverse flow preventing devices, it is characterized in that: the endoporus of cylindrical shell and the guiding valve cunning place of joining are provided with O-ring seals three by the weep hole updrift side.
7. novel reverse flow preventing device according to claim 1, it is characterized in that: the upstream extremity of described back valve gap has the protrusion platform, the end face of described platform has groove, in the described groove with screw, packing ring fastening sealing gasket, described sealing gasket matches with the annular sword limit of guiding valve end face, forms drain valve.
8. according to claim 1 or 2 or 3 described novel reverse flow preventing devices, it is characterized in that: the axostylus axostyle of described spool adopts stainless steel, and flap adopts teflon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120145935 CN202012642U (en) | 2011-05-10 | 2011-05-10 | Novel backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120145935 CN202012642U (en) | 2011-05-10 | 2011-05-10 | Novel backflow preventer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202012642U true CN202012642U (en) | 2011-10-19 |
Family
ID=44783256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120145935 Expired - Lifetime CN202012642U (en) | 2011-05-10 | 2011-05-10 | Novel backflow preventer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202012642U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865389A (en) * | 2012-08-30 | 2013-01-09 | 杭州春江阀门有限公司 | Water hammer resistant backflow preventer |
| CN104329490A (en) * | 2014-09-24 | 2015-02-04 | 杭州春江阀门有限公司 | Low-resistance backflow preventer |
| CN105042122A (en) * | 2015-08-26 | 2015-11-11 | 天津市塘沽沃特斯阀门有限公司 | Water-saving minitype backflow preventer |
| CN105370924A (en) * | 2015-10-28 | 2016-03-02 | 杭州春江阀门有限公司 | Side valve type decompression backflow preventer |
| CN106763909A (en) * | 2017-01-21 | 2017-05-31 | 佛山市德天电器有限公司 | Three hole check valves and the frostless heat pump with three hole check valves |
| CN107676507A (en) * | 2017-10-31 | 2018-02-09 | 湖北三江航天红峰控制有限公司 | A kind of combination check valve |
| CN108668596A (en) * | 2018-06-01 | 2018-10-19 | 江苏大学 | A kind of water-fertilizer integral with check valve irrigates, fertilization system |
-
2011
- 2011-05-10 CN CN 201120145935 patent/CN202012642U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865389A (en) * | 2012-08-30 | 2013-01-09 | 杭州春江阀门有限公司 | Water hammer resistant backflow preventer |
| CN102865389B (en) * | 2012-08-30 | 2014-01-08 | 杭州春江阀门有限公司 | Water hammer resistant backflow preventer |
| CN104329490A (en) * | 2014-09-24 | 2015-02-04 | 杭州春江阀门有限公司 | Low-resistance backflow preventer |
| CN105042122A (en) * | 2015-08-26 | 2015-11-11 | 天津市塘沽沃特斯阀门有限公司 | Water-saving minitype backflow preventer |
| CN105370924A (en) * | 2015-10-28 | 2016-03-02 | 杭州春江阀门有限公司 | Side valve type decompression backflow preventer |
| CN105370924B (en) * | 2015-10-28 | 2017-08-01 | 杭州春江阀门有限公司 | Side valve type pressure reduction type backflow preventer |
| CN106763909A (en) * | 2017-01-21 | 2017-05-31 | 佛山市德天电器有限公司 | Three hole check valves and the frostless heat pump with three hole check valves |
| CN106763909B (en) * | 2017-01-21 | 2023-04-18 | 佛山市德天电器有限公司 | Three-hole one-way valve and frostless heat pump system with three-hole one-way valve |
| CN107676507A (en) * | 2017-10-31 | 2018-02-09 | 湖北三江航天红峰控制有限公司 | A kind of combination check valve |
| CN108668596A (en) * | 2018-06-01 | 2018-10-19 | 江苏大学 | A kind of water-fertilizer integral with check valve irrigates, fertilization system |
| CN108668596B (en) * | 2018-06-01 | 2022-04-22 | 江苏大学 | Water and fertilizer integrated irrigation and fertilization system with one-way valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111019 |