CN205745457U - A kind of backflow preventer - Google Patents
A kind of backflow preventer Download PDFInfo
- Publication number
- CN205745457U CN205745457U CN201620529797.9U CN201620529797U CN205745457U CN 205745457 U CN205745457 U CN 205745457U CN 201620529797 U CN201620529797 U CN 201620529797U CN 205745457 U CN205745457 U CN 205745457U
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- valve
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- water trap
- intermediate cavity
- spring
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Abstract
A kind of backflow preventer, belongs to pipeline valve technical field.It includes interconnective one-level check-valves and secondary check valve, intermediate cavity is formed between one-level check-valves and secondary check valve, intermediate cavity both sides are respectively water inlet and outlet, water inlet, intermediate cavity and outlet set gradually into water pressure tap, intermediate cavity pressure tap and water outlet pressure tap, intermediate cavity connects the valve body side of water trap by transfer tube, water inlet is connected with the valve gap of water trap by connecting tube, water trap is double diaphragm, double-spring structures, by double diaphragms, the common effect of dual spring, make water trap work or close.This utility model is by arranging two springs, when pressure anomaly, even if two check-valves all can not reversely seal, safe drain valve also can automatically turn on refluence water emptying, and form air partition, guaranteeing that upstream supplies the water hygiene and safety, it has the features such as compact conformation, safe and reliable, drainage performance is good.
Description
Technical field
This utility model belongs to pipeline valve technical field, is specifically related to that a kind of structure is reliable, drainage performance good and controlled
The backflow preventer that property is good.
Background technology
It is known that the reason causing town and country water supply network water pollution is many, however undeniable, fall
It is one of major reason causing town and country water supply network water pollution once again that stream pollutes.Use in water supply system at present is all kinds of
Type check-valves, although also play the effect of aqueous reflux in pipe network that prevents, but its reliability, safety are poor, once flap
Or sealing member is damaged, the effect preventing aqueous reflux will be lost completely, make Drinking Water generation backflow pollution, to people
Class health works the mischief.It addition, it is the biggest by the loss of flood peak of check-valves.
Backflow preventer, as effective facility of protection water supply quality safety, the most extensively makes in more American-European developed countries
With；In China, especially into new century, due to developing rapidly of urban construction, water-supply systems are more and more huger, to certainly
The requirement of water water quality improves constantly, and device for preventing flowing backwards is gradually being paid attention to and promoting the use of.Occur in the market
Although backflow preventer the most also can play the effect preventing aqueous reflux, but somewhat the most not fully up to expectations.Non-return
Valve water resistance is relatively big, or water trap (drain valve) impeded drainage.It is difficult to meet user's requirement.
Utility model content
For the above-mentioned problems in the prior art, the purpose of this utility model is to provide that a kind of structure is reliable, row
The backflow preventer that aqueous is good, easy to maintenance and controllability is good.
Described a kind of backflow preventer, including interconnective one-level check-valves and secondary check valve and be hung on outward centre
Water trap outside chamber, forms intermediate cavity between described one-level check-valves and secondary check valve, intermediate cavity both sides are respectively water inlet
And outlet, water inlet, intermediate cavity and outlet set gradually into water pressure tap, intermediate cavity pressure tap and water outlet pressure tap, its
Being characterised by that intermediate cavity is passed through transfer tube and connected the valve body side of water trap, water inlet is connected by the valve gap of connecting tube with water trap
Connecing, described water trap is double diaphragm, double-spring structures, by double diaphragms, the common effect of dual spring, makes water trap work or closes
Close.
Described a kind of backflow preventer, it is characterised in that described water trap includes valve body, valve gap and fixes even with valve gap
The gland connect, is provided with valve seat, valve rod assembly, main spring, auxiliary spring, axle sleeve in described valve body, described axle sleeve is arranged on gland
In slotted eye, valve seat is arranged on body base, and valve rod assembly is arranged between valve seat and axle sleeve, and main spring, auxiliary spring are arranged at
On valve rod assembly, valve rod assembly, under two spring effects, moves up and down in valve body.
Described a kind of backflow preventer, it is characterised in that the valve rod assembly of described water trap include guide rod, support and
Valve rod, described guide rod is arranged in valve seat, and support casing is connected on guide rod；Stem bottom is rack-mount, and top movable is arranged
In axle sleeve, described valve rod sets gradually lower platen, lower diaphragm, center platen, upper diaphragm, top board and locking screw from bottom to up
Mother, lower diaphragm is between lower platen and center platen, and lower diaphragm outer edge extends on the joint face of valve body and valve gap；Upper film
Sheet, between center platen and top board, is finally locked on valve rod by locking nut, and upper diaphragm outer edge extends to gland
With on the joint face of valve gap；Described auxiliary spring is arranged between top board and axle sleeve, main spring be arranged on valve body and lower platen it
Between.
Described a kind of backflow preventer, it is characterised in that be provided with the funnel for outwards sluicing bottom described water trap,
Funnel is bolted on body base, and funnel contacts with valve seat and coordinates, and is provided with sealing ring between valve seat and valve body.
Described a kind of backflow preventer, it is characterised in that described water trap top is provided with regulation screw, regulation screw with
Gland is threaded, and contacts with axle sleeve bottom regulation screw and coordinate.
Described a kind of backflow preventer, it is characterised in that described connecting tube is copper connecting tube.
Described a kind of backflow preventer, it is characterised in that described frame bottom is provided with fluting, arranges sealing gasket in groove, close
Contacting with guide rod below packing, guide rod is positioned at slotted eye in the middle of valve seat, and guide rod top is threaded connection, and is anchored at the bottom of valve rod
Portion.
Described a kind of backflow preventer, it is characterised in that one-level check-valves local head can lose, the centre of intermediate cavity
The pressure P1 that the water inlet pressure tap of the pressure P2 consistently lower than water inlet that chamber pressure tap is measured is measured, the lower diaphragm of water trap is upper and lower
Forming pressure reduction, this pressure reduction and auxiliary spring act on jointly, and the valve rod assembly ordered about in water trap moves downward, and makes sealing gasket tight
Pressure valve seat, water trap is closed, pipeline normal water supply.
Described a kind of backflow preventer, it is characterised in that during pressure anomaly, the pressure that the water outlet pressure tap of outlet is measured
The pressure P2 that power P3 is measured higher than intermediate cavity pressure tap, even if one-level check-valves and secondary check valve all can not reversely seal, row
Hydrophone orders about valve rod assembly under the common effect of reverse differential pressure and main spring and moves upward, and automatically turns on refluence water emptying,
And forming air partition, it is ensured that upstream is for the water hygiene and safety.
By using above-mentioned technology, compared with prior art, the beneficial effects of the utility model are as follows:
1) this utility model is by arranging auxiliary spring, and is arranged on by auxiliary spring between top board and axle sleeve, due to one-level
Check-valves local head can lose, and the pressure P2 that the intermediate cavity pressure tap of intermediate cavity is measured is consistently lower than the water inlet pressure measurement of water inlet
The pressure P1 that hole is measured, the lower diaphragm of water trap forms pressure reduction up and down, and this pressure reduction and auxiliary spring act on jointly, order about draining
Valve rod assembly in device moves downward, and makes sealing gasket press valve seat, and water trap is closed, pipeline normal water supply；
2) this utility model is by arranging main spring, and is disposed between valve body and lower platen, when pressure anomaly,
The pressure P2 that the pressure P3 that i.e. the water outlet pressure tap of outlet is measured measures higher than intermediate cavity pressure tap, though one-level check-valves and
Secondary check valve all can not reversely seal, water trap can order about under the common effect of reverse differential pressure and main spring valve rod assembly to
Upper motion, automatically turns on refluence water emptying, and forms air partition, it is ensured that upstream is for the water hygiene and safety；
3) water trap of the present utility model is by using dual spring, double diaphragm technology, it is ensured that Stability Analysis of Structures, draining sensitivity
Height, its structure is reliable, drainage good, easy to maintenance and controllability good, is suitable to popularization and application.
Accompanying drawing explanation
Fig. 1 is main TV structure schematic diagram of the present utility model；
Fig. 2 is perspective view of the present utility model；
Fig. 3 is water trap sectional view structural representation of the present utility model.
In figure: 1-one-level check-valves, 2-is intake pressure tap, 3-intermediate cavity pressure tap, 4-secondary check valve, 5-water outlet pressure measurement
Hole, 6-pipe connecting device, 7-water trap, 8-valve gap, 9-upper diaphragm, 10-gland, 11-auxiliary spring, 12-regulates screw, 13-axle sleeve,
14-locking nut, 15-top board, 16-center platen, 17-sealing ring, 18-support, 19-sealing gasket, 20-guide rod, 21-transfers
Pipe, 22-funnel, 23-valve seat, 24-valve body, 25-main spring, 26-valve rod, 27-lower platen, diaphragm under 28-.
Detailed description of the invention
Below in conjunction with Figure of description, the utility model is described in further detail, but protection domain of the present utility model is not
It is only limitted to this:
As shown in Figure 1-2, a kind of backflow preventer of the present utility model, including interconnective one-level check-valves 1 and two
Level check-valves 4, between described one-level check-valves 1 and secondary check valve 4 formed intermediate cavity, intermediate cavity both sides be respectively water inlet and
Outlet, water inlet, intermediate cavity and outlet set gradually into water pressure tap 2, intermediate cavity pressure tap 3 and water outlet pressure tap 5, in
Between chamber connect valve body 24 side of water trap 7 by transfer tube 21, water inlet is used by connecting tube 6(this utility model
Copper connecting tube) it is connected with the valve gap 8 of water trap 7, described water trap 7 is double diaphragm, double-spring structures, by double diaphragms, dual spring
Common effect, makes water trap work or closes.
As it is shown on figure 3, water trap 7 of the present utility model includes valve body 24, valve gap 8 and the gland that be connected fixing with valve gap 8
10, it is provided with valve seat 23, valve rod assembly, main spring 25, auxiliary spring 11, axle sleeve 13 in described valve body 24, described axle sleeve 13 is arranged on
In the slotted eye of gland 10, valve seat 23 is arranged on bottom valve body 24, and valve rod assembly is arranged between valve seat 23 and axle sleeve 13, in external force
And under the common effect of spring, valve rod assembly can slide up and down between valve seat 23 and axle sleeve 13, during valve rod assembly motion, upper end
Axle sleeve 13 hole and lower value seat 23 hole play the guiding role；Due to valve rod 26 top and the particular design of guide rod 20 structure so that valve
During bar component movement, frictional resistance is the least.Be conducive to water trap stable performance.
Valve rod assembly includes that guide rod 20, support 18, sealing gasket 19 and valve rod 26, described guide rod 20 are arranged in valve seat 23,
Support 18 and sealing gasket 19 are socketed on guide rod 20；Being threaded connection fastening with guide rod 20 bottom valve rod 26, top movable sets
Put in axle sleeve 13, described valve rod 26 sets gradually from bottom to up lower platen 27, lower diaphragm 28, center platen 16, upper diaphragm 9,
Top board 15 and locking nut 14, lower diaphragm 28 is between lower platen 27 and center platen 16, and lower diaphragm 28 outer edge extends
To the valve body 24 joint face with valve gap 8, lower diaphragm 28 upper and lower surface separates；Upper diaphragm 9 is positioned at center platen 16 and top board 15
Between, finally locked on valve stem 26 by locking nut 14, and upper diaphragm 9 outer edge extends to the connection of gland 10 and valve gap 8
On face, upper diaphragm 9 upper and lower surface separates；Described auxiliary spring 11 is arranged between top board 15 and axle sleeve 13, and main spring 25 is arranged
Between valve body 24 and lower platen 27, it is used for supporting valve rod assembly.
As it can be seen, be provided with funnel 22 bottom described water trap 7, funnel 22 is bolted on bottom valve body 24, leakage
22 tops of struggling against contact with valve seat 23 and coordinate, and are easy to outside draining.
Described water trap 7 top is provided with regulation screw 12, and regulation screw 12 is threadeded with gland 10, and regulation screw
Contacting with axle sleeve 13 bottom 12 and coordinate, the setting of regulation screw 12 is for use when special operation condition or maintenance valve, can to lead to
Overregulate screw 12 and axle sleeve 13 adjusts the active force of auxiliary spring 11, the performance of regulation drainer.
It is provided with fluting bottom described support 18, sealing gasket 19 is set in groove, along the circumferential direction sets bottom described sealing gasket 19
Put the bulge loop that a circle is downward, make its elastic space relatively big by the setting of bulge loop, improve the controllability of spring further.
As it can be seen, water inlet can lose due to one-level check-valves 1 local head, the intermediate cavity pressure tap 3 of intermediate cavity is surveyed
The pressure P1 that the water inlet pressure tap 2 of the pressure P2 consistently lower than water inlet gone out is measured, the lower diaphragm about 28 of water trap 7 forms pressure
Poor, this pressure reduction and auxiliary spring 11 act on jointly, and the valve rod assembly ordered about in water trap 7 moves downward, and makes sealing gasket 19 tight
Pressure valve seat 23, water trap 7 is closed, the pipeline normal water supply of backflow preventer；When loine pressure exception, i.e. water outlet
The pressure P2 that the pressure P3 that the water outlet pressure tap 5 of mouth is measured measures higher than intermediate cavity pressure tap 3, though one-level check-valves 1 and two
Level check-valves 4 all can not reversely seal, and water trap 7 of the present utility model drives under the common effect of reverse differential pressure and main spring 25
Make valve rod assembly move upward, automatically turn on refluence water emptying, and form air partition, it is ensured that upstream is for the water hygiene and peace
Entirely.
This utility model by using above-mentioned dual spring, double diaphragm technology by water trap, it is ensured that Stability Analysis of Structures, draining is sensitive
Degree height；Top is furnished with a regulation screw, the performance of regulation drainer.
Claims (7)
1. a backflow preventer, including interconnective one-level check-valves (1) and secondary check valve (4) and be hung on outward intermediate cavity
Outer water trap (7), forms intermediate cavity between described one-level check-valves (1) and secondary check valve (4), intermediate cavity both sides are respectively
Water inlet and outlet, water inlet, intermediate cavity and outlet set gradually into water pressure tap (2), intermediate cavity pressure tap (3) and go out
Water pressure tap (5), it is characterised in that intermediate cavity connects valve body (24) side of water trap (7), water inlet by transfer tube (21)
Being connected with the valve gap (8) of water trap (7) by connecting tube (6), described water trap (7) is double diaphragm, double-spring structures, by double films
Sheet, the common effect of dual spring, make water trap work or close.
A kind of backflow preventer the most according to claim 1, it is characterised in that described water trap (7) include valve body (24),
Valve gap (8) and the gland (10) that be connected fixing with valve gap (8), be provided with valve seat (23), valve rod assembly, main bullet in described valve body (24)
Spring (25), auxiliary spring (11), axle sleeve (13), described axle sleeve (13) is arranged in the slotted eye of gland (10), and valve seat (23) is arranged on
Valve body (24) bottom, valve rod assembly is arranged between valve seat (23) and axle sleeve (13), and main spring (25), auxiliary spring (11) are respectively provided with
On valve rod assembly, valve rod assembly, under two spring effects, moves up and down in valve body (24).
A kind of backflow preventer the most according to claim 2, it is characterised in that the valve rod assembly bag of described water trap (7)
Including guide rod (20), support (18) and valve rod (26), described guide rod (20) is arranged in valve seat (23), and support (18) is socketed in guide rod
(20) on；Valve rod (26) bottom is arranged on support (18), in top movable is arranged on axle sleeve (13), on described valve rod (26) from
Under supreme set gradually lower platen (27), lower diaphragm (28), center platen (16), upper diaphragm (9), top board (15) and locking nut
(14), lower diaphragm (28) is positioned between lower platen (27) and center platen (16), and lower diaphragm (28) outer edge extends to valve body
(24) with on the joint face of valve gap (8)；Upper diaphragm (9) is positioned between center platen (16) and top board (15), finally by locking screw
Female (14) are locked on valve rod (26), and upper diaphragm (9) outer edge extends on the joint face of gland (10) and valve gap (8)；Institute
Stating auxiliary spring (11) to be arranged between top board (15) and axle sleeve (13), main spring (25) is arranged on valve body (24) and lower platen
(27) between.
A kind of backflow preventer the most according to claim 2, it is characterised in that described water trap (7) bottom be provided with for
The funnel (22) of outer sluicing, funnel (22) is bolted on valve body (24) bottom, and funnel (22) top and valve seat (23)
Contact cooperation, between valve seat (23) and valve body (24), be provided with sealing ring.
A kind of backflow preventer the most according to claim 2, it is characterised in that described water trap (7) top is provided with regulation spiral shell
Nail (12), regulation screw (12) is threadeded with gland (10), and regulation screw (12) bottom contacts with axle sleeve (13) and coordinates.
A kind of backflow preventer the most according to claim 2, it is characterised in that described connecting tube (6) is copper connecting tube.
A kind of backflow preventer the most according to claim 3, it is characterised in that described support (18) bottom is provided with fluting, groove
Inside arranging sealing gasket (19), sealing gasket (19) contacts with guide rod (20) below, and guide rod (20) is positioned at slotted eye in the middle of valve seat (23),
Guide rod (20) top is threaded connection, and is anchored on valve rod (26) bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620529797.9U CN205745457U (en) | 2016-06-03 | 2016-06-03 | A kind of backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620529797.9U CN205745457U (en) | 2016-06-03 | 2016-06-03 | A kind of backflow preventer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205745457U true CN205745457U (en) | 2016-11-30 |
Family
ID=57360219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620529797.9U Active CN205745457U (en) | 2016-06-03 | 2016-06-03 | A kind of backflow preventer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205745457U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332342A (en) * | 2019-08-05 | 2019-10-15 | 浙江卡博铜业有限公司 | A kind of low resistance force counter flow stop |
-
2016
- 2016-06-03 CN CN201620529797.9U patent/CN205745457U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332342A (en) * | 2019-08-05 | 2019-10-15 | 浙江卡博铜业有限公司 | A kind of low resistance force counter flow stop |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |