CN202597807U - Copper-plastic composite decompression type backflow preventer - Google Patents
Copper-plastic composite decompression type backflow preventer Download PDFInfo
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- CN202597807U CN202597807U CN 201220201214 CN201220201214U CN202597807U CN 202597807 U CN202597807 U CN 202597807U CN 201220201214 CN201220201214 CN 201220201214 CN 201220201214 U CN201220201214 U CN 201220201214U CN 202597807 U CN202597807 U CN 202597807U
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- valve
- safety check
- housing
- ball valve
- backflow preventer
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Abstract
The utility model discloses a copper-plastic composite decompression type backflow preventer. The copper-plastic composite decompression type backflow preventer comprises a water inlet ball valve, a primary check valve, a secondary check valve and a water outlet ball valve, which are connected sequentially, wherein a bypass water drainage reducing valve is mounted between the primary check valve and the secondary check valve; and the water drainage reducing valve is divided into a valve deck and a valve body of the water drainage reducing valve. The copper-plastic composite decompression type backflow preventer is characterized in that a shell is made from engineering plastics as a raw material, so that the low yield problem due to foundry technology of stainless steel and copper and the like is avoided; processing of the backflow preventer is convenient; the weight is light; the production cost can be effectively reduced; a fixing screw is used to fix the shell, the water inlet ball valve and the water outlet ball valve; a connecting sleeve is arranged between the water inlet ball valve and the shell; two O-shaped rings are arranged on the connecting sleeve; the connecting sleeve and the water inlet ball valve are in axial seal; the connecting sleeve and the shell are in radial seal; the two ball valves are connected by a supporting plate and fixed by the fixing screw; to ensure enough compression amount of the axially sealed O-shaped rings, the sealing surface between the water outlet ball valve and the shell is not perpendicular to the axis; and the position of the shell can be finely adjusted up and down, so as to ensure sealing between the shell and the ball valves.
Description
Technical field
The utility model relates to a kind of copper plastic composite decompression type backflow preventer.
Background technique
In all kinds of water supply lines; The various safety check that use at present 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.
The decompression type backflow preventer that occurs at present; A patent of invention that is called backflow preventer like application number for the CN200910063250.9 name; It comprises valve body, offers access opening on the valve body, connects valve gap on the access opening; Establish dismountable check valve assembly in the valve body of access opening both sides respectively, establish drain valve on the valve body between two check valve assemblies.The two ends that backflow preventer is employed in single valve body or combinaing valve body are provided with two detachable non-return assemblies; Simultaneously access opening and valve gap are set on valve body top; Can be implemented in line maintenance like this, promptly open valve gap after, can take out the non-return assembly easily and change or repair.The material that the valve body of existing technology adopts is that copper, stainless steel or cast iron cast inblock are come out, Heavy Weight, and cost is high; The defective of its existence is that valve body structure is complicated, and reject rate is high, and technology is difficult to be grasped; The valve body difficulty of processing is also big, is not easy production and assembly, need further make improvement.
Summary of the invention
The utility model technical problem to be solved provides a kind of simple and reasonable, easy production, copper plastic composite decompression type backflow preventer that yield rate is high.
The technological scheme of the utility model technical solution problem is such: a kind of copper plastic composite decompression type backflow preventer, and the sluicing reduction valve of water intake ball valve, one-level safety check, secondary safety check, water outlet ball valve and bypass that it comprises housing, connect successively, the sluicing reduction valve is installed in the below of housing; Between one-level safety check and 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, it is characterized in that it is that raw material is processed that said housing adopts engineering plastics, fixes through set screw between housing and water intake ball valve and the water outlet ball valve; Be provided with connecting sleeve between said water intake ball valve and the housing; Two O type circles are arranged on the connecting sleeve, and connecting sleeve and water intake ball valve are axial seal between the two, are radial seals between connecting sleeve and the housing; Connect with dunnage between two ball valves; And fix with set screw, for the O type circle that guarantees axial seal has enough decrements, sealing surface and axis between said water outlet ball valve and the housing are off plumbs; Can finely tune up and down the position of housing, guarantee the sealing between housing and the ball valve.
As improvement, the valve body and the valve gap of said sluicing reduction valve are also made of engineering plastics, fix through set screw between they and the housing.
As improvement, the valve port of said sluicing reduction valve is arranged on the housing.
When changing, said one-level safety check and secondary safety check are cascaded structure.
As improvement, 3 test water nozzles have been threaded on the said housing.
As improvement, said one-level safety check is identical with the structure of secondary safety check, and this one-level safety check and secondary safety check have included valve core case, spool and guider; Directional post is arranged on the guider, and this directional post is pegged graft with spool and is cooperated, and valve core case is threaded with guider; Support has spring between described spool and the guider; Have groove on the spool, in groove, be provided with sealing gasket, described sealing gasket cooperates with valve core case.
As improvement, be provided with positioning work piece between described one-level safety check and the secondary safety check, prevent that two safety check from contacting with each other, cause that safety check is abnormal to open.
As improvement, it is that raw material are processed that said O type circle adopts rubber.
Compared with prior art; The advantage of the utility model is: 1, to adopt engineering plastics be raw material for said housing, the low problem of yield rate of having avoided the casting technique with materials such as stainless steel, copper to cause, and it is easy to process; In light weight, effectively reduced cost of production.2, the valve body of said sluicing reduction valve and valve gap are also made with engineering plastics, and be in light weight, easy to process, and up-to-standard rate is high.3, fix through set screw between said housing and water intake ball valve and the water outlet ball valve, be provided with connecting sleeve between said water intake ball valve and the housing, two O type circles are arranged on the connecting sleeve; Connecting sleeve and water intake ball valve are axial seal between the two; Be radial seal between connecting sleeve and the housing, connect with dunnage between two ball valves, and fix with set screw; For the O type circle that guarantees axial seal has enough decrements; Sealing surface and axis between said water outlet ball valve and the housing are off plumbs, can finely tune up and down the position of housing, guarantee the sealing between housing and the ball valve.
Description of drawings
Fig. 1 is the copper plastic composite decompression type backflow preventer structure sectional view of the utility model.
Fig. 2 is the copper plastic composite decompression type backflow preventer External view of the utility model.
Fig. 3 is the structural representation of the safety check of the utility model.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
Shown in Fig. 1-2; A kind of copper plastic composite decompression type backflow preventer; It comprises housing 1, the water intake ball valve 2, one-level safety check 3, secondary safety check 4, water outlet ball valve 5 and the sluicing reduction valve 6 that connect successively; The below that described sluicing reduction valve 6 is installed housing 1 is between one-level safety check 3 and secondary safety check 4.It is that raw material is processed that housing 1 adopts engineering plastics, fixing through set screw 12 between housing 1 and water intake ball valve 2 and the water outlet ball valve 5, is provided with connecting sleeve 7 between said water intake ball valve 2 and the housing 1; O type circle 71 and O type circle 72 are arranged on the connecting sleeve 7; Connecting sleeve 7 and water intake ball valve 2 through 72 radial seals of O type circle, connect with dunnage 9 between two ball valves between connecting sleeve 7 and the housing 2 between the two through 71 axial seals of O type circle; And it is fixing with set screw 10; For the O type circle that guarantees axial seal has enough decrements, sealing surface and axis between said water outlet ball valve 5 and the housing 1 are off plumbs, and both surface of contact are inclined-planes 51; Housing 1 is provided with the circular groove perpendicular to the inclined-plane; Be placed with O type circle 11 in the groove, can finely tune up and down the position of housing 1 during assembling, guarantee the sealing between housing 1 and the ball valve.
Said sluicing reduction valve 6 is made up of reduction valve valve gap 61, relief valve body 62, barrier film 63, valve seat 64, spring 65, valve port 66, is fixed by set screw 13 between said sluicing reduction valve 6 and the housing, and the barrier film 63 between relief valve body 62 and the valve gap 61 is divided into two chambeies up and down to reduction valve 6; Upper chamber portion links to each other with cavity between one-level safety check 3 and the secondary safety check 4, and the cavity of resorption part links to each other with cavity between water intake ball valve 2 and the one-level safety check 3, and valve port 66 is set directly on the housing 1; Valve seat is provided with plane pad 67, is provided with spring 65 between valve gap 61 and the barrier film 63, under the effect of spring force; Valve port 66 closely contacts with plane pad 67 on the valve seat; The reduction valve of guaranteeing to sluice or not, and is empty in the middle of the valve seat 64, when the pressure of the barrier film 63 epicoeles pressure greater than barrier film 63 cavity of resorptions; And overcome spring force; Promote valve seat 64 and move down, sluicing reduction valve 6 is opened, and water is discharged in the middle of valve seat 64.
Described one-level safety check 3 adopts vertical and relatively independent mounting type with secondary safety check 4, and it can be keeped in repair separately or change, and is more convenient for the user to use; Described one-level safety check 3 is identical with the structure of secondary safety check 4, has included valve core case 31, spool 32, spring 33 and guider 34, and guider 34 is provided with directional post 37; It is that raw material are processed that described valve core case 31, spool 32 and guider 34 all adopt engineering plastics, makes it easy to process, and this valve core seat 31 is threaded with guider 34; The joint also is provided with O type circle 38 between valve core case 31 and housing 1; The medium that has effectively prevented the inside is to external leakage, and described spool 32 centers also have jack 35, and this jack 35 is pegged graft with directional post 37 and cooperated; Support has spring 33 between guider 34 and the spool 32; Make spool 32 remain the trend that seals with valve core case 31, on this spool 32, have groove, in groove, be provided with sealing gasket 35; It is that raw material are processed that sealing pad 35 adopts rubber; Closely cooperate with valve core case, can normally open in the specific occasion in order to guarantee described pressure-relief type reduction valve, said one-level safety check is different with the interior spring of secondary safety check.Be provided with positioning work piece 8 between described one-level safety check 3 and the secondary safety check 4, prevent that two safety check from contacting with each other, cause that safety check is abnormal to open.
Three test water nozzles 14 also have been threaded on the said housing 1; These three test water nozzles 14 specifically are distributed between one-level safety check 3 and the water intake ball valve 2 successively; Between one-level safety check 3 and the secondary safety check 4 and between secondary safety check 4 and the water outlet ball valve 5, and be the straight line distribution, described test water nozzle 14 can detect product on line; Judge that whether safety check and sluicing reduction valve lost efficacy, and had effectively prevented the potential safety hazard that possibly occur.
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 epicoele of sluicing reduction valve bypass flow channel to drain valve; At this moment pressure differential deltap P=P1-P2 of the total existence of the following epicoele of drain valve.The hydraulic pressure height overall of inlet is in the hydraulic pressure at water outlet place during proper flow, and through backflow preventer, the flow size all can not flow backwards water very smoothly.At this moment sluice valve base of pressure reducing valve under the effect of Δ P, overcome spring force, make sealing gasket contact with annular seating, the sluicing reduction 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, cavity pressure is still greater than upper cavity pressure under the reduction valve barrier film that then sluices, and pressure differential deltap P is constant, and the sluicing reduction 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, valve seat moves downward under the effect of spring force, and the sluicing reduction 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 the sluicing reduction valve can both be discharged water, and covers enough air; Must not hand over anti-flowing water to suck the import main, prevent backflow pollution reliably.Have only when Δ P reaches regulation numerical value, the sluicing reduction valve just cuts out and resets.
Claims (7)
1. copper plastic composite decompression type backflow preventer, it comprises that housing, the water intake ball valve, one-level safety check, secondary safety check and the water outlet ball valve that connect successively, the sluicing reduction valve of bypass are 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; It is characterized in that it is that raw material is processed that said housing adopts engineering plastics; Fix through set screw between housing and water intake ball valve and the water outlet ball valve, be provided with connecting sleeve between said water intake ball valve and the housing, two O type circles are arranged on the connecting sleeve; Connecting sleeve and water intake ball valve are axial seal between the two; Be radial seal between connecting sleeve and the housing, connect with dunnage between two ball valves, and fix with set screw; For the O type circle that guarantees axial seal has enough decrements; Sealing surface and axis between said water outlet ball valve and the housing are off plumbs, can finely tune up and down the position of housing, guarantee the sealing between housing and the ball valve.
2. copper plastic composite decompression type backflow preventer according to claim 1, it is characterized in that: the valve body and the valve gap of said sluicing reduction valve are also made of engineering plastics, fix through set screw between they and the housing.
3. copper plastic composite decompression type backflow preventer according to claim 1, it is characterized in that: the valve port of said sluicing reduction valve is arranged on the housing.
4. copper plastic composite decompression type backflow preventer according to claim 1, it is characterized in that: said one-level safety check and secondary safety check are cascaded structure.
5. copper plastic composite decompression type backflow preventer according to claim 1 is characterized in that: 3 test water nozzles have been threaded on the said housing.
6. copper plastic composite decompression type backflow preventer according to claim 1; It is characterized in that: said one-level safety check is identical with the structure of secondary safety check, and this one-level safety check and secondary safety check have included valve core case, spool and guider, and directional post is arranged on the guider; This directional post is pegged graft with spool and is cooperated; Valve core case is threaded with guider, and support has spring between described spool and the guider, has groove on the spool; In groove, be provided with sealing gasket, described sealing gasket cooperates with valve core case.
7. copper plastic composite decompression type backflow preventer according to claim 1 is characterized in that: be provided with positioning work piece between described one-level safety check and the secondary safety check, prevent that two safety check from contacting with each other, cause that safety check is abnormal to open.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220201214 CN202597807U (en) | 2012-05-08 | 2012-05-08 | Copper-plastic composite decompression type backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220201214 CN202597807U (en) | 2012-05-08 | 2012-05-08 | Copper-plastic composite decompression type backflow preventer |
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| Publication Number | Publication Date |
|---|---|
| CN202597807U true CN202597807U (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220201214 Expired - Fee Related CN202597807U (en) | 2012-05-08 | 2012-05-08 | Copper-plastic composite decompression type backflow preventer |
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| Country | Link |
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| CN (1) | CN202597807U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257870A (en) * | 2015-11-27 | 2016-01-20 | 江苏华太电力仪表有限公司 | Straight-through type high-sealing check 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 |
| CN107327598A (en) * | 2017-07-01 | 2017-11-07 | 宁波华成阀门有限公司 | A kind of compound double check valve (DCV) of copper modeling and its manufacture method |
| CN112066042A (en) * | 2020-07-31 | 2020-12-11 | 清华大学 | Control rod drive line non-return combination valve structure and control rod water pressure drive system |
-
2012
- 2012-05-08 CN CN 201220201214 patent/CN202597807U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257870A (en) * | 2015-11-27 | 2016-01-20 | 江苏华太电力仪表有限公司 | Straight-through type high-sealing check valve |
| CN105257870B (en) * | 2015-11-27 | 2018-04-20 | 江苏华太电力仪表有限公司 | A kind of through type high leakproofness check-valves |
| 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 |
| CN107327598A (en) * | 2017-07-01 | 2017-11-07 | 宁波华成阀门有限公司 | A kind of compound double check valve (DCV) of copper modeling and its manufacture method |
| CN112066042A (en) * | 2020-07-31 | 2020-12-11 | 清华大学 | Control rod drive line non-return combination valve structure and control rod water pressure drive system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20180508 |