CN105927767A - Novel low-resistance backflow preventer - Google Patents
Novel low-resistance backflow preventer Download PDFInfo
- Publication number
- CN105927767A CN105927767A CN201610516696.2A CN201610516696A CN105927767A CN 105927767 A CN105927767 A CN 105927767A CN 201610516696 A CN201610516696 A CN 201610516696A CN 105927767 A CN105927767 A CN 105927767A
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- China
- Prior art keywords
- valve
- check
- valves
- pressure chamber
- gate valve
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/12—Covers for housings
Abstract
The invention relates to the technical field of backflow preventers, in particular to a novel low-resistance backflow preventer. The novel low-resistance backflow preventer comprises a valve body, wherein the two sides of the valve body are separately connected with a belt barrel type filter gate valve and a downstream gate valve; a first non-return valve and a second non-return valve are sequentially mounted in the valve body; a first pressure chamber is arranged between the inlet end of the belt barrel type filter gate valve and the inlet end of the first non-return valve; a second pressure chamber is arranged between the outlet end of the first non-return valve and the inlet end of the second non-return valve; a third pressure chamber is arranged between the outlet end of the second non-return valve and the outlet end of the downstream gate valve; and a first test port, a second test port and a third test port are separately arranged on the first pressure chamber, the second pressure chamber and the third pressure chamber; a water relief valve is mounted below the second pressure chamber; one end of the water relief valve is connected with a diversion tube; one end of the diversion tube is connected with a connecting head; and the connecting head is connected with the first pressure chamber. The novel low-resistance backflow preventer has the characteristics of being compact in structure, small in size, light in weight, easy to mount and detect, and the like.
Description
Technical field
The present invention relates to backflow preventer technical field, particularly relate to a kind of novel low-resistance backflow preventer.
Background technology
Backflow preventer be a kind of strict restriction conduit current can only the device of one-way flow, restrained effectively the backflow pollution phenomenon of Drinking Water pipeline, reached the most contaminated purpose of watering.Wherein backflow preventer comprises two classes: double non-return backflow preventers and pressure reduction type backflow preventer.
Double non-return backflow preventers are mainly made up of two check-valves, and conventional check valves mainly has two kinds: swing check valve and lift check valve.All there is various defect in these two kinds of conventional check valves.Especially conventional check valves is under the operating mode of low discharge, and current exist huge resistance.Swing check valve is little relative to the resistance to water-flow of lift check valve, but this check-valves is during long-term opening and closing, and sealing surface easily weares and teares；And the mechanical mechanism of the check valve set of tradition lift efficiently avoid the abrasion of sealing surface, but the check-valves of this this class is the most serious to the resistance of current.
Pressure reduction type backflow preventer, in addition to installing two check-valves, also assembles a drain valve, more plays the protection not contaminated effect in water source, upstream.In use, owing to the parts long period of soaking of valve body and valve inner is in water, the internal movement clearance between moving component and stationary parts is little for traditional drain valve, invades the produced corrosion of bubble and makes the moving component cannot normal operation.
Backflow preventer has three pressure chambers, and each pressure chamber is required for arranging a detection mouth, it is therefore an objective to judge whether backflow preventer is in normal duty by the force value detecting each pressure chamber.If the structure length of backflow preventer is too short, the position of detection mouth and the position relative close of check-valves.Now, current are by the testing result of this adjacent detection mouth of vortes interference produced by check-valves.Therefore, the structure length of traditional backflow preventer is long, and installing space is big, and installation cost is of a relatively high.
Backflow preventer both domestic and external is desirable that can on-line maintenance.That is, it is not necessary to by the most replaceable for whole backflow preventer dismounting from pipeline or keep in repair its internal parts.Therefore, backflow preventer all should arrange valve gap, and the inner body of backflow preventer can be placed under repair by dismantling valve gap and change by workman.For traditional backflow preventer, its structure often arranges two valve gaps, and its valve gap is heavy, and installing/dismounting is loaded down with trivial details, and on-line maintenance is costly.
Summary of the invention
The technical problem to be solved, is the technical deficiency for above-mentioned existence, it is provided that a kind of compact conformation, volume is little, lightweight, be easily installed detection novel low-resistance backflow preventer.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: include that valve body, valve body both sides are connected to band barrel shape filter gate valve and downstream gate valve；The first check-valves and the second check-valves it is sequentially installed with in valve body；It is the first pressure chamber between arrival end and the arrival end of the first check-valves with barrel shape filter gate valve, being the second pressure chamber between the port of export and the arrival end of the second check-valves of the first check-valves, the port of export of the second check-valves and the port of export of downstream gate valve are the 3rd pressure chamber；It is respectively arranged with the first test port, the second test port, the 3rd test port on first pressure chamber, the second pressure chamber, the 3rd pressure chamber；Being provided with drain valve below second pressure chamber, one end of drain valve connects mozzle, and one end of mozzle connects connector, and connector and the first pressure chamber connect；Body cavity both sides have been respectively arranged with the first groove and the second groove, the first check-valves and the second check-valves and have been respectively embedded into the first groove and the second groove；Being provided with support member between first check-valves and the second check-valves, support member is bolted in valve body；Valve body is fixedly arranged above valve gap and supports, and valve gap supports upper end and is provided with rubber gasket, has been bolted valve gap above valve gap support.
Optimizing the technical program further, described band barrel shape filter gate valve includes gate valve body, is respectively arranged with gate valve flap and the connection of screen pack gate valve flap one end has valve rod in gate valve body, and valve rod one end connects handwheel；Valve rod top is provided with threaded stem, and threaded stem is threaded pointer；It is enclosed with sleeve outside pointer, sleeve is provided with indicating graduation；Being bolted gate valve cover above gate valve body, gate valve body lower end connects chock plug.
Optimizing the technical program further, described valve gap uses domes, and valve bonnet seal face is plane.
Optimizing the technical program, a described check-valves and the second check-valves both sides further is planar structure.
Optimize the technical program further, outside described drain valve, be provided with discharge opening.
Optimizing the technical program further, described the first test port, the second test port, the 3rd test port are all in the same side.
Compared with prior art, the invention have the advantages that
1, backflow preventer is provided with the valve gap being easily installed and dismantling, and facilitates operator to be replaced internal parts；
2, the two check-valves resistances to water-flow being arranged in backflow preventer are low, long working life；
3, the parts in valve body can be avoided to invade for a long time by drain valve to duck in drink；
4, the first check-valves and the second check-valves both sides are planar structure, prevent check-valves from rotating at body cavity.
Accompanying drawing explanation
Fig. 1 is a kind of novel low-resistance backflow preventer structure schematic diagram.
Fig. 2 is a kind of novel low-resistance backflow preventer sectional view.
Fig. 3 is the valve body structure schematic diagram of a kind of novel low-resistance backflow preventer.
Fig. 4 is the band barrel shape filter gate valve partial schematic diagram of a kind of novel low-resistance backflow preventer.
In figure: 1, valve body；2, band barrel shape filter gate valve；3, downstream gate valve；4, the first check-valves；5, the second check-valves；6, the first pressure chamber；7, the second pressure chamber；8, the 3rd pressure chamber；9, the first test port；10, the second test port；11, the 3rd test port；12, drain valve；13, mozzle；14, connector；15, the first groove；16, the second groove；17, support member；18, valve gap supports；19, rubber gasket；20, valve gap；21, gate valve body；22, gate valve flap；23, screen pack；24, valve rod；25, handwheel；26, threaded stem；27, pointer；28, sleeve；29, indicating graduation；30, gate valve cover；31, chock plug；32, discharge opening.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention of greater clarity, below in conjunction with detailed description of the invention and referring to the drawings, the present invention is described in more detail.It should be understood that these describe the most exemplary, and it is not intended to limit the scope of the present invention.Additionally, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring idea of the invention.
Detailed description of the invention one: combine shown in Fig. 1-4, including valve body 1, valve body both sides are connected to band barrel shape filter gate valve 2 and downstream gate valve 3；The first check-valves 4 and the second check-valves 5 it is sequentially installed with in valve body 1；It is the first pressure chamber 6 between arrival end and the arrival end of the first check-valves 4 with barrel shape filter gate valve 2, being the second pressure chamber 7 between the port of export and the arrival end of the second check-valves 5 of the first check-valves 4, the port of export of the second check-valves 5 and the port of export of downstream gate valve 3 are the 3rd pressure chamber 8；It is respectively arranged with first test port the 9, second test port the 10, the 3rd test port 11 on first pressure chamber the 6, second pressure chamber the 7, the 3rd pressure chamber 8；Being provided with drain valve 12 below second pressure chamber 7, one end of drain valve 12 connects mozzle 13, and one end of mozzle 13 connects has connector 14, connector 14 to be connected with the first pressure chamber 6；Valve body 1 inner chamber both sides have been respectively arranged with the first groove 15 and the second groove 16, and the first check-valves 4 and the second check-valves 5 are respectively embedded into the first groove 15 and the second groove 16；Being provided with support member 17 between first check-valves 4 and the second check-valves 4, support member 17 is bolted in valve body 1；Valve body 1 is fixedly arranged above valve gap and supports 18, and valve gap supports 18 upper ends and is provided with rubber gasket 19, and valve gap supports and has been bolted valve gap 20 above in the of 18；Band barrel shape filter gate valve 2 includes gate valve body 21, is respectively arranged with gate valve flap 22 and screen pack 23 in gate valve body 21,；Gate valve flap 22 one end connects valve rod 24, and valve rod 24 one end connects handwheel 25；Valve rod 24 top is provided with threaded stem 26, and threaded stem 26 is threaded pointer 27；It is enclosed with sleeve 28 outside pointer 27, sleeve 28 is provided with indicating graduation 29；Being bolted gate valve cover 30 above gate valve body 21, gate valve body 21 lower end connects chock plug 31；Valve gap 20 uses domes, and valve bonnet seal face is plane；First check-valves 5 and the second check-valves 6 both sides are planar structure；Discharge opening 32 it is provided with outside drain valve 12；First test port the 9, second test port the 10, the 3rd test port 11 is all in the same side.
nullThe present invention is in the specific implementation，Backflow preventer arrival end arranges a band barrel shape filter gate valve 2，The port of export arranges a downstream gate valve 3，Valve body 1 installs the first check-valves 4 and the second check-valves 5，Two check-valves can only make water body one-way movement (from left to right)，Valve body 1 is internal is divided into three pressure chambers，It is the first pressure chamber 6 between arrival end and the arrival end of the first check-valves 4 of backflow preventer，It is the second pressure chamber 7 between the port of export and the arrival end of the second check-valves 5 of the first check-valves 4，The port of export of the second check-valves 5 and the port of export of backflow preventer are the 3rd pressure chamber 8，The pressure loss can be produced when current are by the first check-valves 4 and the second check-valves 5，The force value of each pressure chamber of backflow preventer is successively decreased step by step with water (flow) direction，Wherein the first test port 9 tests the force value of the first pressure chamber 6，Second test port 10 tests the force value of the second pressure chamber 7，3rd test port 11 tests the force value of the 3rd pressure chamber 8；Drain valve 12 is arranged at the second pressure chamber 7, and the connector 14 in drain valve 12 is connected with the first pressure chamber 6, and the open and close of drain valve 12 are mainly affected by the pressure reduction of this first pressure chamber 6 and the second pressure chamber 7；When backflow preventer is in until duty, the first check-valves 4 and the second check-valves 5 are in normally off, and drain valve 12 is in normally open, and the water body of the second pressure chamber 7 can sluice at discharge opening 32；When backflow preventer is in normal operating conditions, the first check-valves 4 and the second check-valves 5 are opened, and drain valve 12 cuts out, and current can one-way flow backflow preventer from left to right；If opening two band barrel shape filter gate valve 2 and downstream gate valves 3, backflow preventer is in running order, now, if drain valve 12 cannot normal switching-off seal, i.e. proves that the first check-valves 4 cannot make the first pressure chamber 6 and the second pressure chamber 7 produce required pressure reduction；First check-valves 4 need to be placed under repair or change by workman.
When current circulate the first check-valves 4, current can produce the bigger pressure loss, and the force value causing the first pressure chamber 6 is higher than the force value of the second pressure chamber 7, in like manner, by the second check-valves 5, the force value of the second pressure chamber 7 is higher than the force value of the first pressure chamber 6；Valve body 1 inner chamber has the first groove 15 and the second groove 16, during installing/dismounting, can be embedded at the first groove 15 by the first check-valves 4, and the second check-valves 5 embeds at the second groove 16；Support member 17 i.e. withstands the first check-valves 4, withstands the second check-valves 5 the most simultaneously so that it is two check-valves will not come off from two grooves；By tightening bolt, support member 17 is fixed on valve body 1；After first check-valves 4 and the second check-valves 5 are arranged on valve body 1, the plane of the first check-valves 4 and the second check-valves 5 both sides prevents two check-valves from rotating at valve body 1 inner chamber；Backflow preventer arrival end arranges band barrel shape filter gate valve 2, can play filtration and throttling action, and the port of export arranges gate valve 3, plays throttling action；When backflow preventer is carried out on-line maintenance, whole backflow preventer can be carried out pipeline isolation.
It should be appreciated that the above-mentioned detailed description of the invention of the present invention is used only for exemplary illustration or explains the principle of the present invention, and it is not construed as limiting the invention.Therefore, any modification, equivalent substitution and improvement etc. done in the case of without departing from the spirit and scope of the present invention, should be included within the scope of the present invention.Additionally, claims of the present invention be intended to fall in the equivalents on scope and border or this scope and border whole change and modifications example.
Claims (6)
1. a novel low-resistance backflow preventer, it is characterised in that: include valve body (1), valve
Body both sides are connected to band barrel shape filter gate valve (2) and downstream gate valve (3)；In valve body (1)
It is sequentially installed with the first check-valves (4) and the second check-valves (5)；Band barrel shape filter gate valve (2)
Arrival end and the arrival end of the first check-valves (4) between be the first pressure chamber (6), the first non-return
It is the second pressure chamber (7) between the port of export and the arrival end of the second check-valves (5) of valve (4), the
The port of export of two check-valves (5) and the port of export of downstream gate valve (3) are the 3rd pressure chamber (8)；The
It is respectively arranged with the first survey on one pressure chamber (6), the second pressure chamber (7), the 3rd pressure chamber (8)
Examination mouth (9), the second test port (10), the 3rd test port (11)；Second pressure chamber (7) lower section peace
Equipped with drain valve (12), one end of drain valve (12) connects mozzle (13), mozzle (13)
One end connect have connector (14), connector (14) to be connected with the first pressure chamber (6)；Valve body
(1) inner chamber both sides have been respectively arranged with the first groove (15) and the second groove (16), the first non-return
Valve (4) and the second check-valves (5) are respectively embedded into the first groove (15) and the second groove (16)；First
Being provided with support member (17) between check-valves (4) and the second check-valves (4), support member (17) passes through
It is bolted in valve body (1)；Valve body (1) is fixedly arranged above valve gap and supports (18), and valve gap supports
(18) upper end is provided with rubber gasket (19), and valve gap supports (18) top and has been bolted
Valve gap (20).
A kind of novel low-resistance backflow preventer the most according to claim 1, its feature
It is: band barrel shape filter gate valve (2) includes gate valve body (21), divides in gate valve body (21)
It is not provided with gate valve flap (22) and screen pack (23)；Gate valve flap (22) one end connects valve rod
(24), valve rod (24) one end connects handwheel (25)；Valve rod (24) top is provided with threaded stem
(26), threaded stem (26) is threaded pointer (27)；Pointer (27) outside is enclosed with sleeve
(28), sleeve (28) is provided with indicating graduation (29)；Bolt is passed through in gate valve body (21) top
Being fixed with gate valve cover (30), gate valve body (21) lower end connects chock plug (31).
A kind of novel low-resistance backflow preventer the most according to claim 1, its feature
It is: valve gap (20) uses domes, and valve bonnet seal face is plane.
A kind of novel low-resistance backflow preventer the most according to claim 1, its feature
It is: the first check-valves (5) and the second check-valves (6) both sides are planar structure.
A kind of novel low-resistance backflow preventer the most according to claim 1, its feature
It is: drain valve (12) outside is provided with discharge opening (32).
A kind of novel low-resistance backflow preventer the most according to claim 1, its feature
It is: the first test port (9), the second test port (10), the 3rd test port (11) are all same
Side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610516696.2A CN105927767B (en) | 2016-07-28 | 2016-07-28 | A kind of low resistance force counter flow stop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610516696.2A CN105927767B (en) | 2016-07-28 | 2016-07-28 | A kind of low resistance force counter flow stop |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105927767A true CN105927767A (en) | 2016-09-07 |
| CN105927767B CN105927767B (en) | 2018-10-26 |
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ID=56828978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610516696.2A Active CN105927767B (en) | 2016-07-28 | 2016-07-28 | A kind of low resistance force counter flow stop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105927767B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107725832A (en) * | 2017-10-24 | 2018-02-23 | 黄晓峰 | A kind of fan coiler temperature controlled valve group |
| WO2018141185A1 (en) * | 2017-02-06 | 2018-08-09 | 广东永泉阀门科技有限公司 | Reduced-pressure type backflow preventer |
| CN113063008A (en) * | 2021-03-30 | 2021-07-02 | 铜陵兴荣阀门管件有限公司 | Single-diaphragm low-resistance backflow preventer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018141185A1 (en) * | 2017-02-06 | 2018-08-09 | 广东永泉阀门科技有限公司 | Reduced-pressure type backflow preventer |
| CN107725832A (en) * | 2017-10-24 | 2018-02-23 | 黄晓峰 | A kind of fan coiler temperature controlled valve group |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105927767B (en) | 2018-10-26 |
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