CN102042430A - Pressure-reducing backflow preventer - Google Patents
Pressure-reducing backflow preventer Download PDFInfo
- Publication number
- CN102042430A CN102042430A CN 201010575647 CN201010575647A CN102042430A CN 102042430 A CN102042430 A CN 102042430A CN 201010575647 CN201010575647 CN 201010575647 CN 201010575647 A CN201010575647 A CN 201010575647A CN 102042430 A CN102042430 A CN 102042430A
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- CN
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- Prior art keywords
- valve body
- flap
- safety check
- cutting ferrule
- backflow preventer
- 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.)
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 230000008859 change Effects 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims description 42
- 238000007789 sealing Methods 0.000 claims description 21
- 230000006837 decompression Effects 0.000 claims description 15
- 230000004888 barrier function Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 9
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 238000005266 casting Methods 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 abstract 3
- 230000009467 reduction Effects 0.000 description 8
- 230000002411 adverse Effects 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 4
- 239000008400 supply water Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Safety Valves (AREA)
- Check Valves (AREA)
Abstract
The invention discloses a pressure-reducing backflow preventer, comprising a valve body and a secondary check valve arranged in the valve body, wherein a membrane device with a primary check valve is positioned above the secondary check valve in the valve body; the lower end of the primary check valve is communicated with the upper end of the secondary check valve; a water inlet communicated with the upper end of the primary check valve is arranged on the upper part of the valve body; the lower part of the valve body is provided with a water outlet communicated with the secondary check valve; the side part of the valve body is provided with an overflow hole; and the membrane device is located in the valve body, and slides up and down in the valve body through the pressure difference between the upper and lower ends of the membrane device so as to change the connection and disconnection of the overflow hole. The pressure-reducing backflow preventer has the characteristics of reasonable structure and ingenious design and is easy to produce and assemble; and the use safety and service life are ensured, and simultaneously the casting and processing difficulties as well as the product price can be greatly reduced.
Description
Technical field
The present invention relates to valve, particularly a kind of decompression type backflow preventer.
Background technique
In the water supply line, the various safety check that use can not strictly limit ducted press water one-way flow at present, so causing pipeline branch pipe, water system and other system joint etc. that adverse current takes place easily pollutes, especially city water-supply pipe network, Drinking Water water tank, domestic water pipeline, pollute and will bring serious harm in case adverse current takes place to resident healthy, be used on suction booster, the fire pump adapter, production such as chemical device and social security aspect will become potential safety hazard.
The present backflow preventer that occurs, as China national Department of Intellectual Property on March 24th, 2010 a disclosed name be called a kind of application for a patent for invention of pressure release type backflow preventer, publication number is CN101676590A, a kind of pressure release type backflow preventer is disclosed in this application for a patent for invention specification, comprise the water intake ball valve that connects successively, the one-level safety check, secondary safety check and water outlet ball valve, the sluicing reduction valve of bypass is 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, but the piston body that it is characterized in that move left and right is arranged in the inner chamber of sluicing reduction valve and is divided into left chamber and right chamber, chamber, a left side is communicated with total water inlet by the passage on the valve gap of sluicing reduction valve, right chamber is communicated with by the water intake and the discharge opening of annular seating with the sluicing reduction valve, be distributed with O-ring seal and inner chamber wall on the piston body circumferential surface and realize slipper seal, the piston body right flank is furnished with sealing gasket and annular seating fitted seal, and is supported with spring between piston body and the annular seating.Owing to its inner safety check, relief valve partly are independent design, need be connected by a plurality of parts during installation, spatial structure is complicated, and therefore installation, dismounting and enforcement maintenance and maintenance are all not too convenient, and cost is higher relatively.
Summary of the invention
Problem to be solved by this invention just provide a kind of simple and reasonable, design decompression type backflow preventer cleverly, can either guarantee the safe in utilization and life-span, simultaneously can reduce casting and difficulty of processing and product price greatly again, and installing space little, install and change simple and convenient and keep in repair easily and maintain.
In order to solve the problems of the technologies described above, the present invention adopts following technological scheme: a kind of decompression type backflow preventer, comprise valve body, be located at the secondary safety check in the valve body, it is characterized in that: be positioned at the diaphragm device that secondary safety check top also is provided with band one-level safety check in the described valve body, described one-level safety check lower end and secondary safety check upper end are connected, be provided with the water intake of connecting with one-level safety check upper end on valve body top, be provided with the water outlet of connecting with the secondary safety check in valve body lower portion, the sidepiece of described valve body is provided with overflow hole, and described diaphragm device is positioned in the valve body and is implemented in the break-make of slide down in-migration change overflow hole in the valve body by the pressure difference of diaphragm device upper and lower end.
Further, described diaphragm device comprises location one-level safety check and changes the position structure I of overflow hole break-make and be located to support position structure I and position structure I is moved up and down in valve body between position structure I and valve body realizes overflow hole break-make and the elastic sealing device that makes one-level safety check proper functioning, described valve body comprises the upper valve body and the following valve body of mutual sealing butt joint, described water intake is located at the upper valve body top, described water outlet is located at down the valve body bottom, described overflow hole is located at down the valve body sidepiece, and described secondary safety check is fixed on down in the valve body.
Further, be provided with annular protrusion upwards in the described valve body down, described position structure I comprises the cutting ferrule that is pressed on the annular protrusion, and be located in the cutting ferrule elastic base I with some through holes, the position that contacts with annular protrusion on the bottom end of cutting ferrule is provided with seal ring, described one-level safety check is positioned on the elastic base I, described elastic sealing device comprises support spring and annular diaphragm, the upper end of support spring is against on the bottom end of cutting ferrule, the lower end of support spring is positioned at down in the valve body, the interior edge of annular diaphragm is fixed on the cutting ferrule, and the outer of annular diaphragm is positioned at down on the valve body upper-end surface and is pressed on down on the valve body fixing by upper valve body.
Further, described one-level safety check comprise the flap I that is located on the elastic base I and be located at flap I and elastic base I between pressure spring I, and be located at flap I top and cooperate the flap seat I that forms sealing pair with flap I, flap seat I is fixed on the cutting ferrule, and flap I is withstanding under the effect of pressure spring I on the flap seat I.
Further, be provided with the flow channel that the upper surface with annular diaphragm is communicated with water intake between described cutting ferrule and the upper valve body.
Further, the lower end of described cutting ferrule is provided with the funnel shaped rectifier that the current through the one-level safety check are converged again.
Further, the elastic base II with some through holes is fixed on down in the valve body described secondary safety check in the valve body by being located at down, described secondary safety check comprise the flap II that is located on the elastic base II and be located at flap II and elastic base II between pressure spring II, and be located at flap II top and cooperate the flap seat II that forms sealing pair with flap II, flap seat II is fixed on down in the valve body, and flap II is withstanding under the effect of pressure spring II on the flap seat II.
Further, described flap I and described flap II coaxial line.Be convenient to produce, install balanced hydraulic pressure during use.
Further, described water intake is provided with inlet connector tube, and inlet connector tube is fixed on the upper valve body by acorn nut I, and described water outlet is provided with outlet pipe connection, and outlet pipe connection is fixed on down on the valve body by acorn nut II.
Further, described elastic sealing device is the elastic ring barrier film, and the interior edge of elastic ring barrier film is fixed on the cutting ferrule, and the outer of elastic ring barrier film is positioned at down on the valve body upper-end surface and is pressed on down on the valve body fixing by upper valve body.
After adopting technique scheme, the present invention has following advantage: one-level safety check and relief valve are combined to form diaphragm device, designs simplification; The active force and the reaction force that make full use of annular diaphragm make the ingenious realization of relief function, and it is compact simple that therefore its structure also becomes, and build diminishes significantly; Pipe joint and valve body are divided into two component connect with acorn nut then, can be convenient to like this change Placement into internal and external threads, flange and cutting ferrule etc., thereby have more usability according to customer requirement; Flap seat and flap etc. adopt corrosion protection, nonhazardous plastics and spring seat and Steel Cable Baffle Ring etc. to adopt stainless steel material, are convenient to processing and batch, and are in light weight, installation, maintenance and maintenance etc. easily.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing:
Fig. 1 is the structural representation of an embodiment of the present invention;
Fig. 2 is for adopting the structural representation of elastic ring barrier film.
Embodiment
The structural representation of an embodiment of the present invention as shown in Figure 1, a kind of decompression type backflow preventer, comprise valve body 1, be located at the secondary safety check in the valve body, be positioned at the diaphragm device that secondary safety check top also is provided with band one-level safety check in the described valve body, described one-level safety check lower end and secondary safety check upper end are connected, be provided with the water intake of connecting with one-level safety check upper end 110 on valve body top, be provided with the water outlet of connecting with the secondary safety check 120 in valve body lower portion, the sidepiece of described valve body is provided with overflow hole 13, and described diaphragm device is positioned in the valve body and is implemented in the break-make of slide down in-migration change overflow hole in the valve body by the pressure difference of diaphragm device upper and lower end.
In the present embodiment, described valve body comprises the upper valve body 11 and the following valve body 12 of mutual sealing butt joint, described water intake is located at the upper valve body top, described water outlet is located at down the valve body bottom, described overflow hole is located at down the valve body sidepiece, and described diaphragm device comprises location one-level safety check and changes the position structure I of overflow hole break-make and be located to support position structure I and position structure I is moved up and down in valve body between position structure I and valve body realizes overflow hole break-make and the elastic sealing device that makes one-level safety check proper functioning.Be provided with annular protrusion 121 upwards in the described valve body down, described position structure I comprises the cutting ferrule 4 that is pressed on the annular protrusion, and be located in the cutting ferrule with the elastic base I43 of some through holes, the position that contacts with annular protrusion on the bottom end of cutting ferrule is provided with seal ring 44; Described elastic sealing device comprises support spring 6 and annular diaphragm 14, and the upper end of support spring is against on the bottom end of cutting ferrule, and the lower end of support spring is positioned at down in the valve body; The interior edge of annular diaphragm is fixed on the cutting ferrule, and the outer of annular diaphragm is positioned at down on the valve body upper-end surface and is pressed on down on the valve body fixing by upper valve body.Between cutting ferrule and upper valve body, be provided with the flow channel 15 that the upper surface with annular diaphragm is communicated with water intake; Be provided with the funnel shaped rectifier 5 that the current through the one-level safety check are converged again in the lower end of cutting ferrule.
Described one-level safety check comprise the flap I21 that is located on the elastic base I and be located at flap I and elastic base I between pressure spring I22, and be located at flap I top and cooperate the flap seat I23 that forms sealing pair with flap I, flap seat I is fixed on the cutting ferrule, and flap I is withstanding under the effect of pressure spring I on the flap seat I.The elastic base II7 with some through holes is fixed on down in the valve body described secondary safety check in the valve body by being located at down, described secondary safety check comprise the flap II31 that is located on the elastic base II and be located at flap II and elastic base II between pressure spring II32, and be located at flap II top and cooperate the flap seat II33 that forms sealing pair with flap II, flap seat II is fixed on down in the valve body, and flap II is withstanding under the effect of pressure spring II on the flap seat II.Described flap I and described flap II coaxial line.
In the foregoing description, be provided with inlet connector tube 8 on described water intake, inlet connector tube is fixed on the upper valve body by acorn nut I81, and described water outlet is provided with outlet pipe connection 9, and outlet pipe connection is fixed on down on the valve body by acorn nut II91; In inlet connector tube, be provided with filter 82, filter be shaped as Rotary-table or cone.In addition, described cutting ferrule comprises cutting ferrule 41 and the last cutting ferrule 42 that is installed on down in the cutting ferrule down, the bottom end of following cutting ferrule is provided with the circular groove 411 that seal ring is installed, the interior edge of described annular diaphragm is positioned at down on the cutting ferrule upper-end surface and is pressed on down on the cutting ferrule fixing by last cutting ferrule, the upper end of described support spring is against down on the bottom end of cutting ferrule, and rectifier and elastic base I are interlockingly connected by last cutting ferrule and following cutting ferrule equally and compress fastening.Flap seat II is set as integrative-structure with following valve body.
Working principle of the present invention is as follows:
1, action just often: when press water enters the upper valve body valve pocket from water intake, with one-level safety check and the whole pushing downwards of position structure I, following cutting ferrule is pressed on the annular protrusion and by seal ring and guarantees sealing, make overflow hole be in closed condition, thereby the intermediate cavity between one-level safety check and the secondary safety check forms airtight cavity, when the one-level safety check is opened, loss is under pressure when press water enters intermediate cavity, then the secondary safety check is opened, press water enters down in the valve body valve pocket, the loss that is under pressure once more, press water flows out from water outlet by whole valve body.Press water is to the effect of annular diaphragm in the upper valve body valve pocket owing to being subjected to, and overflow hole remains closed condition, and overflow does not take place; From the refluence of valve body valve pocket generation down, just be prevented at the secondary safety check.When first safety check takes place unusual, block as rubbish, when can't accept the pressure loss, the annular diaphragm of water effect of being under pressure detects the pressure of supply water of press water and the pressure difference of intermediate cavity, one-level safety check and position structure I integral body are moved up, open relief valve, release pressure, poor up to reaching normal pressure.
2, when taking place to flow backwards: if second safety check has taken place unusually, when blocking as rubbish, the water of water outlet rises or one-level the pressure of intermediate cavity adverse current, the secondary safety check has all taken place unusually, when blocking as rubbish, enter from water intake that the water of upper valve body valve pocket is normal to be flowed into and make its pressure rising from the reverse intermediate cavity that flows to of water that the water outlet adverse current enters down the valve body valve pocket, the annular diaphragm of water effect of being under pressure detects the pressure of supply water of press water and the pressure difference of intermediate cavity, one-level safety check and position structure I integral body are moved up, overflow hole is opened, discharge the water of adverse current, can not cause the water adverse current situation of upper valve body valve pocket.
When 3, backsiphonage phenomenon took place: even negative pressure appearance takes place in the distribution pipe, the one-level safety check can prevent adverse current.If when the one-level safety check had abnormal conditions, rubbish was blocked, annular diaphragm detects the pressure difference of the pressure of supply water of press water and intermediate cavity or detects the information that this pressure difference diminishes, and one-level safety check and position structure I integral body are moved up, and overflow hole is opened.Final for understanding the negative pressure appearance of disappear water intake and the generation of distribution pipe side, from the overflow hole suck air.
Also having a kind of situation in addition is exactly the upper end that elastic device is located at cutting ferrule, cutting ferrule is pushed away downwards, just realize overflow in the time of can between the pressure of the pressure of supply water of water intake and intermediate cavity, having big pressure reduction like this, practical with respect to the situation that the one-level safety check is accurate.
Described in addition elastic sealing device also has a kind of structural type, adopt elastic ring barrier film 6 ' as shown in Figure 2, the interior edge of elastic ring barrier film is fixed on the cutting ferrule, and the outer of elastic ring barrier film is positioned at down on the valve body upper-end surface and is pressed on down on the valve body fixing by upper valve body.Save support spring like this, but the requirement of elastic ring barrier film is improved, possess sealing and spring function simultaneously.
Except that above preferred embodiment, the present invention also has other mode of execution, and those skilled in the art can make various changes and distortion according to the present invention, only otherwise break away from spirit of the present invention, all should belong to the defined scope of claims of the present invention.
Claims (10)
1. decompression type backflow preventer, comprise valve body (1), be located at the secondary safety check in the valve body, it is characterized in that: be positioned at the diaphragm device that secondary safety check top also is provided with band one-level safety check in the described valve body, described one-level safety check lower end and secondary safety check upper end are connected, be provided with the water intake of connecting with one-level safety check upper end (110) on valve body top, be provided with the water outlet of connecting with the secondary safety check (120) in valve body lower portion, the sidepiece of described valve body is provided with overflow hole (13), and described diaphragm device is positioned in the valve body and is implemented in the break-make of slide down in-migration change overflow hole in the valve body by the pressure difference of diaphragm device upper and lower end.
2. a kind of decompression type backflow preventer according to claim 1, it is characterized in that: described diaphragm device comprises location one-level safety check and changes the position structure I of overflow hole break-make and be located to support position structure I and position structure I is moved up and down in valve body between position structure I and valve body realizes overflow hole break-make and the elastic sealing device that makes one-level safety check proper functioning, described valve body comprises the upper valve body (11) and the following valve body (12) of mutual sealing butt joint, described water intake is located at the upper valve body top, described water outlet is located at down the valve body bottom, described overflow hole is located at down the valve body sidepiece, and described secondary safety check is fixed on down in the valve body.
3. a kind of decompression type backflow preventer according to claim 2, it is characterized in that: be provided with annular protrusion (121) upwards in the described valve body down, described position structure I comprises the cutting ferrule (4) that is pressed on the annular protrusion, and be located in the cutting ferrule elastic base I (43) with some through holes, the position that contacts with annular protrusion on the bottom end of cutting ferrule is provided with seal ring (44), described one-level safety check is positioned on the elastic base I, described elastic sealing device comprises support spring (6) and annular diaphragm (14), the upper end of support spring is against on the bottom end of cutting ferrule, the lower end of support spring is positioned at down in the valve body, the interior edge of annular diaphragm is fixed on the cutting ferrule, and the outer of annular diaphragm is positioned at down on the valve body upper-end surface and is pressed on down on the valve body fixing by upper valve body.
4. a kind of decompression type backflow preventer according to claim 3, it is characterized in that: described one-level safety check comprise the flap I (21) that is located on the elastic base I and be located at flap I and elastic base I between pressure spring I (22), and be located at flap I top and cooperate the flap seat I (23) that forms sealing pair with flap I, flap seat I is fixed on the cutting ferrule, and flap I is withstanding under the effect of pressure spring I on the flap seat I.
5. a kind of decompression type backflow preventer according to claim 3 is characterized in that: be provided with the flow channel (15) that the upper surface with annular diaphragm is communicated with water intake between described cutting ferrule and the upper valve body.
6. a kind of decompression type backflow preventer according to claim 3 is characterized in that: the lower end of described cutting ferrule is provided with the funnel shaped rectifier (5) that the current through the one-level safety check are converged again.
7. a kind of decompression type backflow preventer according to claim 1, it is characterized in that: the elastic base II (7) with some through holes is fixed on down in the valve body described secondary safety check in the valve body by being located at down, described secondary safety check comprise the flap II (31) that is located on the elastic base II and be located at flap II and elastic base II between pressure spring II (32), and be located at flap II top and cooperate the flap seat II (33) that forms sealing pair with flap II, flap seat II is fixed on down in the valve body, and flap II is withstanding under the effect of pressure spring II on the flap seat II.
8. a kind of decompression type backflow preventer according to claim 7 is characterized in that: described flap II and flap I coaxial line.
9. a kind of decompression type backflow preventer according to claim 1, it is characterized in that: described water intake is provided with inlet connector tube (8), inlet connector tube is fixed on the upper valve body by acorn nut I (81), described water outlet is provided with outlet pipe connection (9), and outlet pipe connection is fixed on down on the valve body by acorn nut II (91).
10. a kind of decompression type backflow preventer according to claim 2, it is characterized in that: described elastic sealing device is an elastic ring barrier film (6 '), the interior edge of elastic ring barrier film is fixed on the cutting ferrule, and the outer of elastic ring barrier film is positioned at down on the valve body upper-end surface and is pressed on down on the valve body fixing by upper valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105756479A CN102042430B (en) | 2010-12-03 | 2010-12-03 | Pressure-reducing backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105756479A CN102042430B (en) | 2010-12-03 | 2010-12-03 | Pressure-reducing backflow preventer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102042430A true CN102042430A (en) | 2011-05-04 |
| CN102042430B CN102042430B (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105756479A Active CN102042430B (en) | 2010-12-03 | 2010-12-03 | Pressure-reducing backflow preventer |
Country Status (1)
| Country | Link |
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| CN (1) | CN102042430B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252116A (en) * | 2011-07-18 | 2011-11-23 | 浙江盾安阀门有限公司 | Diaphragm-inbuilt type low-resistance backflow preventer |
| CN102865389A (en) * | 2012-08-30 | 2013-01-09 | 杭州春江阀门有限公司 | Water hammer resistant backflow preventer |
| CN114352781A (en) * | 2022-03-17 | 2022-04-15 | 中车太原机车车辆有限公司 | Air supply adjusting valve for railway freight car |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB900875A (en) * | 1959-11-12 | 1962-07-11 | Sierra Eng Co | Check valve |
| CN101097019A (en) * | 2006-06-27 | 2008-01-02 | 上海上龙阀门厂 | Process for manufacturing anti-soil draining equipment with non-return device |
| CN201221629Y (en) * | 2008-07-11 | 2009-04-15 | 上海上龙阀门厂 | Built-in drain type backflow preventer |
| CN101676590A (en) * | 2008-09-17 | 2010-03-24 | 宁波华成阀门有限公司 | Pressure release type backflow preventer |
| CN201787144U (en) * | 2010-07-22 | 2011-04-06 | 宁波华成阀门有限公司 | Secondary check valve |
| CN201916551U (en) * | 2010-12-03 | 2011-08-03 | 浙江盾安阀门有限公司 | Pressure reducing type backflow preventer |
-
2010
- 2010-12-03 CN CN2010105756479A patent/CN102042430B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB900875A (en) * | 1959-11-12 | 1962-07-11 | Sierra Eng Co | Check valve |
| CN101097019A (en) * | 2006-06-27 | 2008-01-02 | 上海上龙阀门厂 | Process for manufacturing anti-soil draining equipment with non-return device |
| CN201221629Y (en) * | 2008-07-11 | 2009-04-15 | 上海上龙阀门厂 | Built-in drain type backflow preventer |
| CN101676590A (en) * | 2008-09-17 | 2010-03-24 | 宁波华成阀门有限公司 | Pressure release type backflow preventer |
| CN201787144U (en) * | 2010-07-22 | 2011-04-06 | 宁波华成阀门有限公司 | Secondary check valve |
| CN201916551U (en) * | 2010-12-03 | 2011-08-03 | 浙江盾安阀门有限公司 | Pressure reducing type backflow preventer |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252116A (en) * | 2011-07-18 | 2011-11-23 | 浙江盾安阀门有限公司 | Diaphragm-inbuilt type low-resistance backflow preventer |
| CN102252116B (en) * | 2011-07-18 | 2013-03-20 | 浙江盾安阀门有限公司 | Diaphragm-inbuilt type low-resistance backflow preventer |
| CN102865389A (en) * | 2012-08-30 | 2013-01-09 | 杭州春江阀门有限公司 | Water hammer resistant backflow preventer |
| CN102865389B (en) * | 2012-08-30 | 2014-01-08 | 杭州春江阀门有限公司 | Water hammer resistant backflow preventer |
| CN114352781A (en) * | 2022-03-17 | 2022-04-15 | 中车太原机车车辆有限公司 | Air supply adjusting valve for railway freight car |
| CN114352781B (en) * | 2022-03-17 | 2022-06-24 | 中车太原机车车辆有限公司 | Air supply adjusting valve for railway freight car |
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| Publication number | Publication date |
|---|---|
| CN102042430B (en) | 2012-07-04 |
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Denomination of invention: A decompression type backflow preventer Effective date of registration: 20211220 Granted publication date: 20120704 Pledgee: Diankou sub branch of Zhejiang Zhuji Rural Commercial Bank Co.,Ltd. Pledgor: Zhejiang deai Intelligent Control Technology Co.,Ltd. Registration number: Y2021980015397 |
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