CN2675985Y - Double non-return backflow preventer - Google Patents
Double non-return backflow preventer Download PDFInfo
- Publication number
- CN2675985Y CN2675985Y CN 200420014585 CN200420014585U CN2675985Y CN 2675985 Y CN2675985 Y CN 2675985Y CN 200420014585 CN200420014585 CN 200420014585 CN 200420014585 U CN200420014585 U CN 200420014585U CN 2675985 Y CN2675985 Y CN 2675985Y
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- CN
- China
- Prior art keywords
- valve
- valve seat
- check valve
- check
- return
- 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.)
- Expired - Fee Related
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Abstract
Disclosed is a double check backflow preventer which is provided with a valve body (16), a valve cover (4), and a sealing component. The utility model is characterized in that a first check valve seat (17) and a second check valve seat which are connected in series (7) are arranged on a stream path in the valve body; the downstream sides of the two check valve seats are respectively provided with check valve clacks (11 a) (11 b), and two check valve rods (15 a) (15 b) which respectively penetrate through the guide components of the two check valve seats in sliding fit are fixedly connected with the corresponding valve clacks; the front ends of the two valve rods and rod bodies between the check valve seats are sheathed with compression spring (14 a) (14 b), and the front ends of the two valve rods are positioned on the upstream sides of the two check valve seats; the downstream sides of the two check valve seats are closed by the valve clacks. The utility model which adopts two stages of check valve door structures which are connected in series can effectively and reliably prevent the back flow of downstream water.
Description
Technical field
The utility model belongs to two non-return backflow preventers that press water in a kind of restriction conduit can only one-way flow.
Background technique
When the current in the needs restrictions press water pipeline can only one-way flow, often the non-return backflow preventer to be installed in pipeline, the main structure of non-return backflow preventer is that one-way cock is set in valve body, existing this class device only is provided with the unidirectional anti-back flow valve of one-level in valve body, can not play the effect of reliable anti-back flow, but also have no test splice, can't check whether product work is normal not enough.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of two non-return backflow preventers that can prevent more reliably that downstream water from refluxing.
The technological scheme that addresses the above problem is (referring to implementing illustration): the utility model is provided with valve body (16), valve gap (4), sealed member, it is characterized in that: first Boilor check valve seat (17) and second Boilor check valve seat (7) that are provided with series connection on the flow channel in valve body, non-return flap (11a) is equipped with in two valve seat downstream sides respectively, (11b), two check-valve levers (15a), (15b) pass the guide element of two valve seats with being slidingly matched respectively, fixedly connected with corresponding flap, two valve rods are with pressure spring (14a) respectively on the front end of valve seat upstream one side and the body of rod between the valve seat, (14b), make flap that the valve seat downstream is one side closed.
Generally, two valve rods are upstream direction tension flap under the effect of pressure spring, with two valve seats sealings, as long as keep enough specific pressures, flap is effective closed valve seat just, when upstream inlet incoming pressure water, flap is backed down in the motion of valve rod pressure spring downstream, and current are by first valve seat, second valve seat is also opened immediately, the pipeline liquid proper flow.When the import water pressure occurs being higher than the import water pressure unusually less than spring precompressed elastic force or downstream water pressure, two-stage closure of check ring under spring force or downstream effect of water pressure.
The utility model adopts the check valve structure of two-stage series connection, can prevent more effective, reliably that downstream water from flowing backwards.
Description of drawings
Fig. 1, the utility model example structure schematic representation
1-joint 2-ball valve 3-screw 4-valve gap 5-seal ring 6-circlip 7-second Boilor check valve seat
8-seal ring 9-screw 10-seal ring 11-non-return flap 12-sealing gasket 13-pressing plate 14-pressure spring
15-check-valve lever 16-valve body 17-first Boilor check valve seat
Specific embodiments
This routine valve body 16 and valve gap 4 are connected as a single entity by screw 3 and seal ring 5, are in series with first Boilor check valve seat 17 on the water route in the valve body and second Boilor check valve seat, 7, two valve seats are tightly connected by O-ring seals 8a, 8b and valve interior wall respectively.
Non-return flap 11a, 11b are located at the downstream side of two valve seats respectively, and respectively with pressing plate 13a, sealing gasket 12a and pressing plate 13b, sealing gasket 12b, fixedly connected with check-valve lever 15a, 15b by screw 9a, 9b, two check-valve levers pass the guide element of corresponding valve seat with being slidingly matched, reach the valve seat upstream side, it is positioned on the body of rod of valve seat upstream side and is with pressure spring 14a, 14b respectively, is stuck between the step and valve seat of end, valve rod upstream to the pressure spring compressive state.
Be respectively equipped with test splice 1a, 1b, 1c on the valve gap on the valve body of the first Boilor check valve seat upstream side, between first Boilor check valve seat and second Boilor check valve seat and on the valve body in the second Boilor check valve seat downstream side, be respectively equipped with switching ball 2a, 2b, 2c in each test splice by handgrip control.Whether these three groups of test splice assemblies can be used for detecting the hydraulic pressure of body cavity, normal to check product work, in case
Find that product work is undesired, the manually-operated gate that is contained in this device inlet/outlet end can be closed, so that maintenance product and the refluence that prevents downstream water.
Claims (3)
1, a kind of pair of non-return backflow preventer, be provided with valve body (16), valve gap (4), sealed member, it is characterized in that: first Boilor check valve seat (17) and second Boilor check valve seat (7) that are provided with series connection on the flow channel in valve body, non-return flap (11a) is equipped with in two valve seat downstream sides respectively, (11b), two check-valve levers (15a), (15b) pass the guide element of two valve seats with being slidingly matched respectively, fixedly connected with corresponding flap, two valve rods are with pressure spring (14a) respectively on the front end of valve seat upstream one side and the body of rod between the valve seat, (14b), make flap that the valve seat downstream is one side closed.
2, according to claim 1 pair of non-return backflow preventer, it is characterized in that: non-return flap (11a), (11b) respectively with pressing plate (13a), sealing gasket (12a) and pressing plate (13b), sealing gasket (12b), fixedly connected with check-valve lever (15a), (15b) by screw (9a), (9b), two check-valve levers are positioned on the body of rod of valve seat upstream side and are with pressure spring (14a) respectively, (14b), be stuck in to the pressure spring compressive state between the step and valve seat of end, valve rod upstream.
3, according to claim 1 and 2 pair of non-return backflow preventer, it is characterized in that: be respectively equipped with test splice (1a), (1b), (1c) on the valve gap on the valve body of the first Boilor check valve seat upstream side, between first Boilor check valve seat and second Boilor check valve seat and on the valve body in the second Boilor check valve seat downstream side, be respectively equipped with switching ball (2a), (2b), (2c) in each test splice by handgrip control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420014585 CN2675985Y (en) | 2004-01-12 | 2004-01-12 | Double non-return backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420014585 CN2675985Y (en) | 2004-01-12 | 2004-01-12 | Double non-return backflow preventer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2675985Y true CN2675985Y (en) | 2005-02-02 |
Family
ID=34482697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420014585 Expired - Fee Related CN2675985Y (en) | 2004-01-12 | 2004-01-12 | Double non-return backflow preventer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2675985Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324281B (en) * | 2008-07-24 | 2010-06-16 | 李习洪 | Novel reverse flow preventing device |
| CN102072342A (en) * | 2010-12-04 | 2011-05-25 | 福建高中压阀门科技有限公司 | Coaxial difference path device with double check valve clacks |
| CN101798833B (en) * | 2009-02-05 | 2011-07-20 | 姜全德 | Three-in-one backflow preventer |
-
2004
- 2004-01-12 CN CN 200420014585 patent/CN2675985Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324281B (en) * | 2008-07-24 | 2010-06-16 | 李习洪 | Novel reverse flow preventing device |
| CN101798833B (en) * | 2009-02-05 | 2011-07-20 | 姜全德 | Three-in-one backflow preventer |
| CN102072342A (en) * | 2010-12-04 | 2011-05-25 | 福建高中压阀门科技有限公司 | Coaxial difference path device with double check valve clacks |
| CN102072342B (en) * | 2010-12-04 | 2012-07-04 | 福建高中压阀门科技有限公司 | Coaxial difference path device with double check valve clacks |
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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: 20050202 Termination date: 20130112 |