CN107990031A - A kind of backflow preventer - Google Patents
A kind of backflow preventer Download PDFInfo
- Publication number
- CN107990031A CN107990031A CN201711492827.9A CN201711492827A CN107990031A CN 107990031 A CN107990031 A CN 107990031A CN 201711492827 A CN201711492827 A CN 201711492827A CN 107990031 A CN107990031 A CN 107990031A
- Authority
- CN
- China
- Prior art keywords
- seal receptacle
- water outlet
- fuse
- water
- ring
- 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.)
- Withdrawn
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 123
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 29
- 238000010276 construction Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 12
- 230000000670 limiting effect Effects 0.000 description 8
- 238000007789 sealing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
Classifications
-
- 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
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
-
- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/044—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with more than one spring
-
- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
Abstract
The present invention provides a kind of backflow preventer, belong to field of mechanical technique.It solves the problems, such as that applicability is low when existing gate valve is applied in combination with check-valves.It includes the valve body of through state, valve body one end is water inlet end, the other end of valve body is water outlet, the core assembly for the keying for being capable of control valve is equipped with valve body, water outlet is connected with non-return component, non-return component includes fuse, gasket and support spring, the port internal thread of water outlet is connected with water out adapter, non-return component further includes the seal receptacle in water outlet, and seal receptacle is threaded in water outlet close to the part of water inlet end, seal receptacle is in a ring, gasket is resisted against on one end of seal receptacle arranged on fuse towards one end of seal receptacle and gasket, the madial wall of water out adapter is protruding with supporting part, one end of support spring withstands on fuse on the end face of seal receptacle, the other end of support spring is withstood on supporting part.It has the advantages that applicability is high, feature-rich.
Description
Technical field
The invention belongs to field of mechanical technique, is related to a kind of backflow preventer.
Background technology
At present, small towns, municipal water users are usually provided with water meter to measure its water consumption on tap water pipe line,
And tap water leakage causes the loss of water resource in order to prevent, can usually be installed before user's water meter such as gate valve, ball valve often
The valve of rule as adjusting and cut-off equipment to use.In addition, the refluence of medium influences the metering of user's water meter in order to prevent, it is right
The management of water resource causes confusion, and can increase a check-valves to be used with gate valve to be combined, wherein gate valve plays medium
Truncation, check-valves play the role of preventing medium from flowing backwards.
However, gate valve and check-valves are all mutually independent valves, being all when traditional group is used in combination directly will only
One end of valve body and one end of gate valve body is gone back to be attached, that is, the jointing using whole check-valves as gate valve,
Although can so make a valve be provided simultaneously with blocking the function with anti-backflow, due to the anti-backflow work(of existing check-valves
Can be realized by spring, and the spring force in general check valve is uncontrollable, therefore user can not be according to making
Pressure limiting is carried out with the demand of environment, so as to cause applicability low.
The content of the invention
The purpose of the present invention is in view of the above-mentioned problems existing in the prior art, it is proposed that a kind of backflow preventer, to be solved
Technical problem be how to improve the applicability of integrated break-make and anti-backflow duty valve.
The purpose of the present invention can be realized by following technical proposal：
A kind of backflow preventer, includes the valve body of through state, and valve body one end is water inlet end, and the other end of valve body is water outlet,
The core assembly for the keying for being capable of control valve is equipped with the valve body, the water outlet is connected with non-return component, non-return component bag
Fuse, gasket and support spring are included, the port internal thread of water outlet is connected with water out adapter, it is characterised in that described to stop
Return component and further include the seal receptacle in water outlet, and seal receptacle is threaded in water outlet close to the part of water inlet end,
In a ring, the gasket is resisted against on one end of seal receptacle seal receptacle arranged on fuse towards one end of seal receptacle and gasket,
The madial wall of water out adapter is protruding with supporting part, and one end of support spring withstands on fuse on the end face of seal receptacle, branch
The other end of support spring is withstood on supporting part.
The operation principle of non-return component is identical with existing check-valves, is all that the hydraulic pressure of water inlet end is utilized in normal water inlet
The direction of gasket to support spring elastic force is pushed open to realize water outlet, and will be close using the elastic force of support spring when not intaking
Packing is pressed on seal receptacle to prevent water from flowing backwards all the time.
Conventionally, if merely to check-valves is integrated in the water outlet of valve body, it is only necessary in the water outlet of valve body
Interior processing sealed step, allows gasket to abut directly against in sealed step to form sealing, and this backflow preventer is in water outlet
End internal thread connection seal receptacle and make one end of gasket be resisted against under the effect of support spring elastic force on seal receptacle be then in order to
Pressure limiting can also be played while anti-backflow is played the role of.Its pressure limiting effect is realized in：Water out adapter screw thread connects
Because to ensure the leakproofness between water outlet and water out adapter therefore between water out adapter and water outlet after being connected on water outlet
Screw thread must be screwed to bottom, otherwise easily make leak source is loosened and occurred between water out adapter and water outlet, therefore water out adapter exists
Position during connection is all to maintain constant every time, after one end of such support spring withstands on the supporting part on the inside of water out adapter
It is maintained for motionless, and since the other end of support spring is withstood on the end face of seal receptacle, and seal receptacle is in water outlet
And be threaded in water outlet close to water inlet end part, seal receptacle do not function similarly to water out adapter it is this be used for connect
The effect of two pipe fittings, and seal receptacle is located in water outlet, therefore for the sealing between seal receptacle and water outlet
And no requirement (NR), this also means that the threaded connection between seal receptacle and water outlet allows to screw or unscrews, ensure that user
Seal receptacle can be made closer or far from the supporting part on the inside of water out adapter by rotary seal seat according to the demand of use environment,
And seal receptacle can play compression support spring closer or far from the supporting part on the inside of water out adapter or release supports
The effect of spring, that is, play the role of adjusting support spring elastic force.And the elastic force of support spring determines the hydraulic pressure of water outlet, because
This can play the role of limiting water outlet hydraulic pressure by the operation of seal receptacle, be improved particularly the applicability of this backflow preventer.
In above-mentioned backflow preventer, the water outlet includes linkage section and threaded installation successively from outside to inside
Section, the internal diameter of linkage section are more than the internal diameter of construction section, and the seal receptacle is threaded in construction section, the water out adapter
It is threadedly coupled with linkage section.
The water outlet of valve body usually can only be threaded to connect water out adapter, but this anti-backflow in the port of water outlet
Valve includes linkage section and threaded construction section successively from outside to inside by the way that water outlet is arranged to, so using construction section just
Seal receptacle can be positioned in water outlet, and be also to enable seal receptacle by construction section and the matched reason of seal receptacle
Close or remote supporting part is reached to adjust the elastic force of support spring, so as to play limitation water outlet hydraulic pressure to improve the work of applicability
With.
In above-mentioned backflow preventer, the seal receptacle include ring-type pedestal and protrude from ring-type pedestal lateral wall and
Threaded connecting portion, connecting portion are threadedly coupled with construction section, and the inner wall of the construction section is equipped with annular convex shoulder, ring-type pedestal
It is resisted against backwards to one end of fuse on annular convex shoulder, the end face of ring-type pedestal towards fuse is equipped with annular protrusion and gasket supports
Lean against on annular protrusion.
Ring-type pedestal is threaded in the construction section of water outlet by threaded connecting portion, while utilizes ring-type pedestal
It is resisted against backwards to one end of fuse on the annular convex shoulder of construction section inner wall to form the limitation to ring-type pedestal installation site, and profit
Ring-type pedestal is resisted against with gasket and protrudes the non-return effect formed with effect towards the annular on fuse end face, so can
Ensure the stability of anti-backflow while this backflow preventer applicability is improved.
In above-mentioned backflow preventer, the fuse is equipped with the supporting rod of protrusion backwards to one end of seal receptacle, described
Supporting part is connected in the sheet of strip and inner wall of the both ends with water out adapter of supporting part, support boom end through supporting part and
Support spring is set on supporting rod.
Since supporting part is the inner wall that protrudes from water out adapter, and the most important effect of water out adapter be for water outlet,
Therefore supporting part is arranged to the sheet in strip, so support spring can either directly be played the role of by water out adapter
To reduce the volume of valve body, while it is as far as possible big to ensure that water yield can be kept as again.In addition, support spring is set in branch
On strut and boom end will be supported to stablize the effect of non-return structure while applicability is improved through supporting part.
It is equipped with the guide pin in strip in above-mentioned backflow preventer, on the inside of the ring-type pedestal, the two of guide pin
The inner wall with ring-type pedestal is held to be connected, the end face of the fuse towards seal receptacle is equipped with the guide rod of protrusion, described
It is oriented to boom end and passes through guide pin.
By setting the guide pin in strip in the inner side of ring-type pedestal, fuse sets protrusion towards one end of seal receptacle
Guide rod, form guiding role through guide pin by guiding boom end, can so ensure that the movement of fuse is more steady,
So as to ensure the normal work of non-return component while non-return component is integrated in water outlet to reduce valve volume.
Compared with prior art, this backflow preventer by water outlet construction section internal thread connect seal receptacle come with sealing
Pad and support spring are engaged to form non-return component, so that valve body collects again while possessing control current on-off function
Make seal receptacle close to or away from supporting part come shape paired springs into the check function of anti-backflow, while by rotary seal seat
The adjusting of elastic force, to play the role of limiting water outlet hydraulic pressure, improves the applicability of this backflow preventer；And due to directly using close
Envelope seat is threaded in the construction section of water outlet and by being used to support the structure of fuse in fixedlying connected to the inner side for water out adapter, because
This eliminates traditional check valve body, reduces the volume of the valve body after integrated check function.
Brief description of the drawings
Fig. 1 is the schematic diagram of this backflow preventer.
Fig. 2 is the sectional view of this backflow preventer.
Fig. 3 A are the side views of seal receptacle in this backflow preventer.
Fig. 3 B are the schematic diagrames at another angle of seal receptacle in this backflow preventer.
Fig. 4 is the schematic diagram of water out adapter in this backflow preventer.
Fig. 5 is the schematic diagram of valve rod in this backflow preventer.
In figure, 1, valve body；1a, water inlet end；1b, water outlet；1b1, linkage section；1b2, construction section；1b21, annular convex shoulder；
2nd, valve rod；2a, location division；2b, attachment；3rd, flashboard；3a, connecting hole；4th, bonnet；4a, location hole；4b, ring-type shoulder block；5th, lock
Cap；6th, dust cap；7th, water out adapter；7a, supporting part；8th, fuse；8a, guide rod；8b, supporting rod；9th, support spring；10th, it is close
Seal seat；10a, ring-type pedestal；10a1, annular protrusion；10a2, guide pin；10b, connecting portion；11st, gasket.
Embodiment
It is the specific embodiment of the present invention and with reference to attached drawing below, technical scheme is further described,
But the present invention is not limited to these embodiments.
As depicted in figs. 1 and 2, a kind of backflow preventer, includes the valve body 1 of through state, and one end of valve body 1 is water inlet end 1a,
The other end of valve body 1 is water outlet 1b, and the core assembly for the keying for being capable of control valve is equipped with valve body 1.In the present embodiment, valve
For gate valve, core assembly includes valve rod 2 and the circumferential flashboard 3 being limited in valve body 1, vertically runs through on flashboard 3 and set
Connecting hole 3a is equipped with, 2 lower end of valve rod is threaded in connecting hole 3a.
As shown in Figure 2 and Figure 5,1 upper end of valve body is equipped with bonnet 4, and 4 upper end of bonnet is equipped with location hole 4a, and 2 upper end of valve rod extends
In location hole 4a.Location hole 4a inner walls are equipped with ring-type shoulder block 4b, and 1 upper end sidepiece of valve body is equipped with the location division 2a of protrusion, location division
The upper surface of 2a and the lower face of ring-type shoulder block 4b lean, and lock nut 5 is socketed with valve rod 2 and lock nut 5 is threaded in positioning
In the lower port of hole 4a, the upper surface and the lower face of location division 2a of lock nut 5 lean.2 upper end of valve rod is from ring-type shoulder block 4b
Centre bore pass through and 2 upper surface of valve rod be equipped with protrusion attachment 2b, the section of attachment 2b is triangular in shape, location hole 4a
Upper port internal thread be connected with dust cap 6.Pass through the setting of section attachment 2b triangular in shape so that valve rod 2 can only be
It could be operated in the case of using specific purpose tool, can so be set the unlatching ratio of flashboard 3 by valve rod 2 in user
After play the role of locking valve rod 2.
As shown in fig. 2 and fig. 3 a, the water outlet 1b of valve body 1 is connected with non-return component, and non-return component includes fuse 8, support
Spring 9 and seal receptacle 10, water outlet 1b include linkage section 1b1 and threaded construction section 1b2 successively from outside to inside, sealing
Seat 10 include ring-type pedestal 10a and protrude from ring-type pedestal 10a lateral walls and threaded connecting portion 10b, connecting portion 10b with
Construction section 1b2 is threadedly coupled, and the inner wall of construction section 1b2 is equipped with annular convex shoulder 1b21, ring-type pedestal 10a backwards to fuse 8 one
End is resisted against on annular convex shoulder 1b21.
As shown in Figure 2 and Figure 4, fuse 8 is arranged in linkage section 1b1, and is threaded with the port of linkage section 1b1
Water out adapter 7, the inner wall of water out adapter 7 are equipped with the supporting part 7a of protrusion, and supporting part 7a is in the sheet and supporting part 7a of strip
Inner wall of the both ends with water out adapter 7 be connected, fuse 8 is equipped with the supporting rod 8b of protrusion, branch backwards to the end face of seal receptacle 10
The end of strut 8b passes through support chip, and support spring 9 is arranged with supporting rod 8b, and one end of support spring 9 withstands on fuse 8
On the end face of seal receptacle 10, the other end of support spring 9 is withstood on support chip.
As shown in fig. 2 and fig. 3b, fuse 8 is equipped with gasket 11 towards one end of seal receptacle 10, and ring-type pedestal 10a is towards core
The end face of son 8 is equipped with annular protrusion 10a1, and gasket 11 is resisted against annular protrusion 10a1 under the elastic force effect of support spring 9
On.The guide pin 10a2 in strip is equipped with the inside of ring-type pedestal 10a, the both ends of guide pin 10a2 are with ring-type pedestal 10a's
Inner wall is connected, and the end face of fuse 8 towards seal receptacle 10 is equipped with the guide rod 8a of protrusion, and the end of guide rod 8a passes through guide pin
10a2。
The operation principle of non-return component is identical with existing check-valves, is all that the water of water inlet end 1a is utilized in normal water inlet
Pressure is pushed the direction of gasket 11 to 9 elastic force of support spring open to realize water outlet, and the bullet of support spring 9 is utilized when not intaking
Gasket 11 is pressed on seal receptacle 10 to prevent water from flowing backwards by power all the time.
This backflow preventer connects seal receptacle 10 in water outlet 1b internal threads and makes one end of gasket 11 in 9 bullet of support spring
It is then to play pressure limiting while anti-backflow is played the role of to be resisted against under power effect on seal receptacle 10.Its pressure limiting
What effect was realized in：Because to ensure water outlet 1b and water out adapter 7 after water out adapter 7 is threaded on the 1b of water outlet
Between leakproofness therefore screw thread between water out adapter 7 and water outlet 1b must be screwed to bottom, otherwise easily make water out adapter 7 with
Loosened between the 1b of water outlet and leak source occur, thus position of the water out adapter 7 in each connection be all to maintain it is constant, so
One end of support spring 9 withstand on after the supporting part 7a of the inner side of water out adapter 7 be also maintained for it is motionless, it is and another due to support spring 9
One end is withstood on the end face of seal receptacle 10, and seal receptacle 10 is to be located in the 1b of water outlet and be threaded in the 1b of water outlet to lean on
The part of nearly water inlet end 1a, seal receptacle 10 do not function similarly to this effect for being used for connecting two pipe fittings of water out adapter 7, and
Seal receptacle 10 be originally in the 1b of water outlet, therefore for the sealing between seal receptacle 10 and water outlet 1b and no requirement (NR),
This also means that the threaded connection between seal receptacle 10 and water outlet 1b allows to screw or unscrews, and ensure that user being capable of root
Supporting part of the seal receptacle 10 closer or far from the inner side of water out adapter 7 is made by rotary seal seat 10 according to the demand of use environment
7a, and seal receptacle 10 closer or far from the supporting part 7a of the inner side of water out adapter 7 can play compression support spring 9 or
The effect of support spring 9 is discharged, that is, plays the role of adjusting 9 elastic force of support spring.And the elastic force of support spring 9 determines out
The hydraulic pressure of water, therefore can play the role of limiting water outlet hydraulic pressure by the operation of seal receptacle 10, it has been improved particularly this anti-backflow
The applicability of valve.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can do various modifications or additions to described specific embodiment or replace in a similar way
Generation, but without departing from spirit of the invention or beyond the scope of the appended claims.
Claims (5)
1. a kind of backflow preventer, include the valve body (1) of through state, valve body (1) one end is water inlet end (1a), valve body (1) it is another
Hold as water outlet (1b), the interior core assembly for being equipped with the keying for being capable of control valve of the valve body (1), water outlet (1b) connection
There is a non-return component, non-return component includes fuse (8), gasket (11) and support spring (9), spiral shell in the port of water outlet (1b)
Line is connected with water out adapter (7), it is characterised in that the non-return component further includes the seal receptacle in water outlet (1b)
(10), and seal receptacle (10) be threaded in water outlet (1b) close to water inlet end (1a) part, seal receptacle (10) in a ring,
The gasket (11) is resisted against the one of seal receptacle (10) arranged on fuse (8) towards one end of seal receptacle (10) and gasket (11)
On end, the madial wall of water out adapter (7) is protruding with supporting part (7a), and one end of support spring (9) withstands on fuse (8) backwards to close
Seal on the end face of seat (10), the other end of support spring (9) is withstood on supporting part (7a).
2. backflow preventer according to claim 1, it is characterised in that the water outlet (1b) includes successively from outside to inside
Linkage section (1b1) and threaded construction section (1b2), the internal diameter of linkage section (1b1) are more than the internal diameter of construction section (1b2), institute
The seal receptacle (10) stated is threaded in construction section (1b2), and the water out adapter (7) is threadedly coupled with linkage section (1b1).
3. backflow preventer according to claim 2, it is characterised in that the seal receptacle (10) includes ring-type pedestal
(10a) and protrude from ring-type pedestal (10a) lateral wall and threaded connecting portion (10b), connecting portion (10b) and construction section
(1b2) is threadedly coupled, and the inner wall of the construction section (1b2) is equipped with annular convex shoulder (1b21), and ring-type pedestal (10a) is backwards to fuse
(8) one end is resisted against on annular convex shoulder (1b21), and the end face of ring-type pedestal (10a) towards fuse (8) is equipped with annular and protrudes
(10a1) and gasket (11) are resisted against on annular protrusion (10a1).
4. according to the backflow preventer described in claim 1 or 2 or 3, it is characterised in that the fuse (8) is backwards to seal receptacle
(10) one end is equipped with the supporting rod (8b) of protrusion, and the supporting part (7a) is in the sheet of strip and the both ends of supporting part (7a)
Inner wall with water out adapter (7) is connected, and supporting rod (8b) end is set in support through supporting part (7a) and support spring (9)
On bar (8b).
5. backflow preventer according to claim 3, it is characterised in that be equipped with the inside of the ring-type pedestal (10a) in length
The guide pin (10a2) of strip, the inner wall of the both ends of guide pin (10a2) with ring-type pedestal (10a) are connected, the fuse
(8) guide rod (8a) of protrusion is equipped with towards the end face of seal receptacle (10), the guide rod (8a) end passes through guide pin
(10a2)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711492827.9A CN107990031A (en) | 2017-12-30 | 2017-12-30 | A kind of backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711492827.9A CN107990031A (en) | 2017-12-30 | 2017-12-30 | A kind of backflow preventer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107990031A true CN107990031A (en) | 2018-05-04 |
Family
ID=62040570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711492827.9A Withdrawn CN107990031A (en) | 2017-12-30 | 2017-12-30 | A kind of backflow preventer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107990031A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108799547A (en) * | 2018-09-06 | 2018-11-13 | 张�杰 | A kind of Auto-drainage connector |
| CN110454595A (en) * | 2019-09-11 | 2019-11-15 | 开维喜阀门集团有限公司 | A kind of water meter protection valve |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10220601A (en) * | 1997-02-03 | 1998-08-21 | Hikari Gokin Seisakusho:Kk | Contraflow preventive type drain valve |
| CN202812262U (en) * | 2012-09-07 | 2013-03-20 | 福建海洋铜业有限公司 | Energy-saving multifunctional valve |
| CN204253950U (en) * | 2014-10-23 | 2015-04-08 | 天津市国威给排水设备制造有限公司 | A kind of leakage-proof backflow-proof valve |
| CN205315827U (en) * | 2016-01-08 | 2016-06-15 | 福建克瑞阀门有限公司 | Multi -functional encryption jam -proof gate valve |
| CN205605867U (en) * | 2016-04-26 | 2016-09-28 | 宁波杰克龙精工有限公司 | Two unification non return gate valves |
| CN207777692U (en) * | 2017-12-30 | 2018-08-28 | 浙江苏明阀门有限公司 | A kind of backflow preventer |
-
2017
- 2017-12-30 CN CN201711492827.9A patent/CN107990031A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10220601A (en) * | 1997-02-03 | 1998-08-21 | Hikari Gokin Seisakusho:Kk | Contraflow preventive type drain valve |
| CN202812262U (en) * | 2012-09-07 | 2013-03-20 | 福建海洋铜业有限公司 | Energy-saving multifunctional valve |
| CN204253950U (en) * | 2014-10-23 | 2015-04-08 | 天津市国威给排水设备制造有限公司 | A kind of leakage-proof backflow-proof valve |
| CN205315827U (en) * | 2016-01-08 | 2016-06-15 | 福建克瑞阀门有限公司 | Multi -functional encryption jam -proof gate valve |
| CN205605867U (en) * | 2016-04-26 | 2016-09-28 | 宁波杰克龙精工有限公司 | Two unification non return gate valves |
| CN207777692U (en) * | 2017-12-30 | 2018-08-28 | 浙江苏明阀门有限公司 | A kind of backflow preventer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108799547A (en) * | 2018-09-06 | 2018-11-13 | 张�杰 | A kind of Auto-drainage connector |
| CN108799547B (en) * | 2018-09-06 | 2023-05-26 | 张�杰 | Automatic drainage joint |
| CN110454595A (en) * | 2019-09-11 | 2019-11-15 | 开维喜阀门集团有限公司 | A kind of water meter protection valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205990922U (en) | Column pilot operated check valve | |
| CN107990031A (en) | A kind of backflow preventer | |
| CN204457580U (en) | Combined type packer | |
| WO2016155319A1 (en) | Multi-protection corrugated pipe stop valve for chlorine use | |
| CN201593397U (en) | Downhole safety valve for oil and gas wells | |
| CN207777692U (en) | A kind of backflow preventer | |
| CN105156040A (en) | Splash-proof joint of square drill rod | |
| CN201306140Y (en) | Valve type float valve | |
| CN201428415Y (en) | Quick pressure testing device of well mouth blowout preventer | |
| CN209339895U (en) | Adjustable offset pumping unit rod sealing device | |
| CN208474627U (en) | Anti-theft ball valve | |
| CN103470824A (en) | Check valve | |
| CN106594336B (en) | A kind of unidirectional relief valve | |
| CN208934643U (en) | A kind of PR2 grade tubing head of special construction | |
| CN205090002U (en) | By restriction valve | |
| CN204878747U (en) | Cage cover choke valve | |
| CN211082978U (en) | Hard-seal fuel oil back pressure valve of diesel engine | |
| CN204187041U (en) | Pneumatic triangle vavle | |
| CN104895528A (en) | Double-pipe safety valve | |
| CN206816826U (en) | Novel high-temperature high-pressure gauge valve | |
| CN205936515U (en) | Slim -hole is with selecting test valve | |
| CN209495060U (en) | A kind of pvc pipe of novel sealing connection structure | |
| CN201306152Y (en) | Pressure-balancing pressure-testing valve | |
| CN202708212U (en) | Check valve with threaded valve seat | |
| CN203905890U (en) | High temperature and high pressure resistant ultra-pound class compressive seal assembly suitable for casing pipe and uncased hole |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180504 |
|
| WW01 | Invention patent application withdrawn after publication |