CN106838387A - The assembly method of protecting against shock lift check valve - Google Patents
The assembly method of protecting against shock lift check valve Download PDFInfo
- Publication number
- CN106838387A CN106838387A CN201710218469.6A CN201710218469A CN106838387A CN 106838387 A CN106838387 A CN 106838387A CN 201710218469 A CN201710218469 A CN 201710218469A CN 106838387 A CN106838387 A CN 106838387A
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- China
- Prior art keywords
- valve
- flap
- spacing block
- floating plug
- fairlead
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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
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
The present invention relates to a kind of assembly method of protecting against shock lift check valve, its step is：1. the assembling of valve body and valve seat, the 2. assembling of the part such as bonnet and fairlead, the 3. assembling of the part such as spacing block and floating plug, 4. overall package, 5. pressure test, 6. dries up the protecting against shock lift check valve of pass the test, outer surface japanning, storage；This assembly method have the advantages that simply, convenient, accuracy rate it is high.
Description
Technical field
The present invention relates to a kind of valve, more particularly, to a kind of assembly method of protecting against shock lift check valve.
Background technology
Lift check valve refers to be flowed in itself by medium and automatic open and close flap, for the valve for preventing medium from flowing backwards
Door, check-valves belongs to a kind of automatic valve, and its Main Function is to prevent medium from flowing backwards, prevent pump and drive motor from inverting, with
And vessel media is released, existing lift check valve mainly includes：Valve body, valve seat, flap, fairlead and bonnet, in valve body
Inlet channel, outlet flow and lumen are provided with, valve seat are provided with the inlet channel port of export, valve seat upper end is provided with sealing surface of seat,
Bonnet is arranged on valve body middle part upper end, is oriented to set upper side and is fixedly mounted between valve body and bonnet, and lumen is stretched into fairlead lower end,
Flap is arranged on inside fairlead, and flap is cylindrical to form upper and lower guiding with fairlead inwall, and flap lower end is provided with can be close with valve seat
Front cover is formed and opens and closes the valve clack sealing surface of valve, is oriented to set upper side and is provided with a non-return hole, the non-return hole one end and outlet flow
Communicate, the other end is communicated with the flap top in fairlead, and its shortcoming is：Flap in opening process, valve inlet side
When medium is interrupted suddenly, flap in the presence of the medium of valve export side, quickly close downwards, and valve clack sealing surface is to valve by flap
Seat sealing surface forms a larger impulsive force, and valve clack sealing surface is easily destroyed with sealing surface of seat, influences service life,
Noise is big simultaneously.
The content of the invention
For defect present in prior art, the present invention provides a kind of when valve inlet side medium is interrupted suddenly, valve
Valve is slowly closed downwards, and valve clack sealing surface is smaller to the impulsive force of sealing surface of seat, and the small one kind of long service life, noise is prevented
The assembly method of impact lift check valve and the valve.
The present invention is realized by following technical solution：
The protecting against shock lift check valve includes:Valve body, valve seat, bonnet and fairlead, valve inner are provided with inlet channel, outlet
Runner and lumen, outlet flow are communicated with lumen, and valve seat is arranged on the inlet channel port of export, and valve seat upper end is provided with valve base sealing
Face, bonnet is fixedly mounted on valve body middle part upper end, is oriented to set upper side and is fixedly mounted on bonnet lower end, and guiding is provided with inside fairlead
Stretch into lumen in inner chamber, fairlead lower end, it is characterised in that：Spacing block is provided with inside fairlead, spacing block is cylindrical to be fixed on guiding
At internal chamber wall, spacing block is directed to inner chamber and is isolated into plunger shaft and pressure regulating cavity, plunger shaft in the top of spacing block, pressure regulating cavity every
From the lower section of block, spacing block is provided with centre bore, and fairlead top is provided with air admission hole, and the air admission hole one end communicates with plunger shaft, separately
One end communicates with outlet flow；Flap is made up of flap head and flap handle, and flap head lower surface is provided with can be with sealing surface of seat shape
Into the valve clack sealing surface of sealing, flap head upper end is stretched into pressure regulating cavity, and the cylindrical guiding internal chamber wall with fairlead of flap head is formed
Upper and lower guiding, is provided with O-ring seal at the guiding internal chamber wall at the guiding position, and flap handle is arranged on flap head upper end, flap
Handle is cylindrical cylindrical less than flap head, and flap handle upper end penetrates the centre bore of spacing block, stretches into plunger shaft, flap handle it is cylindrical with every
Upper and lower guiding is formed from the center hole wall of block, groove is provided with the hole wall of Bing Gai centers, and O-shaped sealing is provided with the groove
Circle；An adjustment hole perpendicular to valve clack sealing surface is provided between the upper and lower end face of flap head, the adjustment hole connection inlet channel with
Pressure regulating cavity；Counter sink is provided with down at spacing block position, the macropore of counter sink is located at aperture bottom, is set at the position of falling counter sink
There is floating plug, floating plug lower end is provided with floating plug tail, the cylindrical upper and lower guiding of formation cylindrical with the macropore of counter sink of floating plug tail, floating plug tail
Cylindrical place is provided with O-ring seal, and floating plug upper end is provided with floating plug head, and floating cold head is provided with a floating plug that sealing can be formed with air admission hole
Sealing surface；Venthole is provided with inside bonnet, venthole one end communicates with outlet flow, and the other end is provided with vertical bleed outlet,
Spherical check ball is provided with the upper end of the bleed outlet.
Further, the check ball is made up of stainless steel material.
Further, the cylindrical position of flap head is provided with positive stop lug boss, the size of the outside diameter of the positive stop lug boss
It is in the same size with fairlead lower end outside diameter.
The assembly method of protecting against shock lift check valve of the present invention is as follows：
1. the assembling of valve body and valve seat：Valve seat is arranged on the inlet channel port of export, keeps sealing surface of seat level upward, uses welding rod
Stretched into from lumen, welded at the cylindrical position and valve body between of valve seat, be welded valve seat；
2. the assembling of the part such as bonnet and fairlead：It is oriented to set upper side and is fixedly welded on bonnet lower end, keeps air admission hole in bonnet
Lower section, and on the top of fairlead, spherical check ball is put into venthole by this end that venthole is communicated with outlet flow, lead to
Cross upset bonnet to adjust the direction worked off one's feeling vent one's spleen, spherical check ball is entered into bleed outlet upper end；
3. the assembling of the part such as spacing block and floating plug：Load O-ring seal at the cylindrical place of floating plug tail, floating plug is loaded spacing block
The place of falling counter sink, is fixed together floating plug head and piston tail part, and the component that spacing block and floating plug are completed loads leads
To inner chamber, spacing block is directed to inner chamber and is isolated into plunger shaft and pressure regulating cavity, and, in the top of spacing block, pressure regulating cavity is in isolation for plunger shaft
The lower section of block, keeps floating plug sealing surface to be formed with air admission hole and seals, and loads O-shaped close in the groove of the center hole wall of spacing block
Seal, loads O-ring seal at the guiding internal chamber wall at pressure regulating cavity position；
4. overall package：Flap is put into lumen, keeps valve clack sealing surface to carry out plane contact with sealing surface of seat, adjust valve
Valve axis is overlapped with valve seat axis, the component that dress sequence number 3 is completed, and valve body top is slowly mounted in fairlead mode directed downwardly,
Lumen is stretched into fairlead lower end, and flap head and flap handle are respectively protruding into pressure regulating cavity and centre bore, bonnet is fixedly mounted on valve body
Middle part upper end, keeps the sealing between bonnet and valve body；
5. pressure test：A. hydraulic pressure strength experiment：Closed valve outlet side, test(ing) medium is passed through from valve body import side, slow to rise
Strengh testing pressure is pressed onto, observation valve surface has No leakage；B. pressurized seal experiment：Air is passed through from valve outlet side, slowly
Test pressure is boosted to, there is No leakage observation valve inlet side；
6. the protecting against shock lift check valve of pass the test is dried up, outer surface japanning, storage.
The advantage of the invention is that：When valve inlet side medium is interrupted suddenly, flap is slowly closed downwards, and flap is to valve
The impulsive force of seat is smaller, and valve clack sealing surface is hardly damaged with sealing surface of seat, and long service life, noise are small；This valve assembling side
Method is simple, convenient, accuracy rate is high.
Brief description of the drawings
Fig. 1 is the opening structural representation of protecting against shock lift check valve of the present invention.
Fig. 2 is the closed mode structural representation of protecting against shock lift check valve of the present invention.
Specific embodiment：
It can be seen from Fig. 1, Fig. 2, protecting against shock lift check valve of the present invention includes：Valve body 1, valve seat 2, bonnet 10 and fairlead 8,
Inlet channel, outlet flow and lumen are provided with inside valve body 1, outlet flow is communicated with lumen, valve seat 2 is arranged on inlet flow and says
Mouth end, the upper end of valve seat 2 is provided with sealing surface of seat, and bonnet 10 is fixedly mounted on the middle part upper end of valve body 1, and peace is fixed in the upper end of fairlead 8
Mounted in the lower end of bonnet 10, guiding inner chamber is provided with inside fairlead 8, the lower end of fairlead 8 stretches into lumen, be provided with inside fairlead 8 every
From block 6, spacing block 6 is cylindrical to be fixed at guiding internal chamber wall, and spacing block 6 is directed to inner chamber and is isolated into plunger shaft 9 and pressure regulating cavity 5,
In the top of spacing block 6, in the lower section of spacing block 6, spacing block 6 is provided with centre bore to pressure regulating cavity 5 to plunger shaft 9, and the top of fairlead 8 sets
There is air admission hole 14, the one end of air admission hole 14 is communicated with plunger shaft 9, and the other end is communicated with outlet flow；Flap 3 is by flap head and valve
Valve handle is constituted, and flap head lower surface is provided with the valve clack sealing surface that sealing can be formed with sealing surface of seat, and tune is stretched into flap head upper end
In pressure chamber 5, flap head is cylindrical to form upper and lower guiding with fairlead 8 guiding internal chamber wall, in the guiding internal chamber wall at the guiding position
Place is provided with O-ring seal 4, and flap handle is arranged on flap head upper end, and flap handle is cylindrical cylindrical less than flap head, flap handle upper end
The centre bore of spacing block 6 is penetrated, plunger shaft 9 is stretched into, flap handle is cylindrical to form upper and lower guiding with spacing block 6 center hole wall, and
O-ring seal 7 is provided with the center hole wall；A tune perpendicular to valve clack sealing surface is provided between the upper and lower end face of flap head
Knothole 17, the adjustment hole 17 connection inlet channel and pressure regulating cavity 5；Counter sink is provided with down at the position of spacing block 6, counter sink is big
Hole position is provided with floating plug 15 in aperture bottom at the position of falling counter sink, and the lower end of floating plug 15 is provided with floating plug tail 16, and floating plug tail 16 is cylindrical
Cylindrical with the macropore of counter sink to form upper and lower guiding, the cylindrical place of floating plug tail 16 is provided with O-ring seal, and the upper end of floating plug 15 is provided with
Floating plug first 13, floating cold first 13 are provided with a floating plug sealing surface that sealing can be formed with air admission hole 14；It is provided with out inside bonnet 10
Stomata 12, one end of venthole 12 communicates with outlet flow, and the other end is provided with vertical bleed outlet, is provided with the upper end of the bleed outlet
Spherical check ball 11.
The assembly method of protecting against shock lift check valve of the present invention is as follows：
1. the assembling of valve body 1 and valve seat 2：Valve seat 2 is arranged on the inlet channel port of export, keeps sealing surface of seat level upward, uses
Welding rod is stretched into from lumen, and cylindrical in valve seat 2 and between valve body 1 position is welded, and is welded valve seat 2；
2. the assembling of bonnet 10 and the grade part of fairlead 8：The upper end of fairlead 8 is fixedly welded on the lower end of bonnet 10, keeps air admission hole
Below bonnet 10, and on the top of fairlead 8, spherical check ball is put into by this end that venthole is communicated with outlet flow
Venthole, the direction worked off one's feeling vent one's spleen is adjusted by overturning bonnet 10, spherical check ball is entered into bleed outlet upper end；
3. the assembling of spacing block 6 and the grade part of floating plug 15：Load O-ring seal at the cylindrical place of floating plug tail 16, floating plug 15 is loaded
The place of falling counter sink of spacing block 6, is fixed together floating plug first 13 and piston tail part 16, and spacing block 6 is assembled with floating plug 13
The component of completion loads guiding inner chamber, and spacing block 6 is directed to inner chamber and is isolated into plunger shaft 9 and pressure regulating cavity 5, and plunger shaft 9 is in isolation
The top of block 6, pressure regulating cavity 5 keeps floating plug sealing surface to be formed with air admission hole 14 and seals, in spacing block 6 in the lower section of spacing block 6
Center hole wall groove load O-ring seal, at the guiding internal chamber wall at the position of pressure regulating cavity 5 load O-ring seal；
4. overall package：Flap 3 is put into lumen, keeps valve clack sealing surface to carry out plane contact with sealing surface of seat, adjusted
Flap axis overlaps with valve seat axis, the component that dress sequence number 3 is completed, and is slowly mounted on valve body 1 in the mode directed downwardly of fairlead 8
Lumen is stretched into portion, the lower end of fairlead 8, and flap head and flap handle are respectively protruding into pressure regulating cavity 5 and centre bore, bonnet is fixedly mounted on
The middle part upper end of valve body 1, keeps the sealing between bonnet 10 and valve body 1；
5. pressure test：A. hydraulic pressure strength experiment：The outlet side of closed valve 1, is passed through test(ing) medium, slowly from the inlet side of valve body 1
Strengh testing pressure is boosted to, observation valve surface has No leakage；B. pressurized seal experiment：Air is passed through from the outlet side of valve body 1, is delayed
Slow to boost to test pressure, there is No leakage observation valve inlet side；
6. the protecting against shock lift check valve of pass the test is dried up, outer surface japanning, storage.
When medium enters fashionable from the valve inlet channel, medium promotes flap to move up, while medium enters from adjustment hole
To pressure regulating cavity, medium promoted and moved on floating plug, and floating plug sealing surface seals air admission hole, the certain media in plunger shaft from bleed outlet, then
Released to outlet flow by venthole.
When the medium in the valve inlet channel is sudden shut off, flap is being moved down from the presence of gravity, due to work
Now enter without medium in plug chamber, plunger shaft forms certain negative pressure, and flap decrease speed slows down, now Jie in pressure regulating cavity
Matter is slowly flowed downward out by adjustment hole, and floating plug is moved down from the presence of gravity, and floating plug head is moved down, floating plug sealing
Air admission hole is opened in face, and the medium in outlet flow enters into plunger shaft by air admission hole, and plunger shaft forms certain pressure, piston
Medium in chamber further promotes flap to move down, and final valve clack sealing surface compresses sealing surface of seat, so as to form sealing, valve
Close.
In sum, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention.
All any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., should be included in of the invention
Within protection domain.
Claims (1)
1. a kind of assembly method of protecting against shock lift check valve, the protecting against shock lift check valve includes:Valve body, valve seat, valve
Lid and fairlead, valve inner are provided with inlet channel, outlet flow and lumen, and outlet flow is communicated with lumen, and valve seat is arranged on
The inlet channel port of export, valve seat upper end is provided with sealing surface of seat, and bonnet is fixedly mounted on valve body middle part upper end, is oriented to set upper side and consolidates
Dingan County is mounted in bonnet lower end, and guiding inner chamber is provided with inside fairlead, and fairlead lower end stretches into lumen, isolation is provided with inside fairlead
Block, spacing block is cylindrical to be fixed at guiding internal chamber wall, and spacing block is directed to inner chamber and is isolated into plunger shaft and pressure regulating cavity, and plunger shaft exists
The top of spacing block, in the lower section of spacing block, spacing block is provided with centre bore to pressure regulating cavity, and fairlead top is provided with air admission hole, and this enters
Stomata one end is communicated with plunger shaft, and the other end is communicated with outlet flow；Flap is made up of flap head and flap handle, flap head lower end
Face is provided with the valve clack sealing surface that sealing can be formed with sealing surface of seat, and flap head upper end stretched into pressure regulating cavity, flap head it is cylindrical with
The guiding internal chamber wall of fairlead forms upper and lower guiding, and O-ring seal, flap are provided with the guiding internal chamber wall at the guiding position
Handle is arranged on flap head upper end, and flap handle is cylindrical cylindrical less than flap head, and flap handle upper end penetrates the centre bore of spacing block, stretches
Enter plunger shaft, flap handle is cylindrical to form upper and lower guiding with spacing block center hole wall, and groove is provided with the hole wall of Bing Gai centers,
And it is provided with O-ring seal in the groove；A regulation perpendicular to valve clack sealing surface is provided between the upper and lower end face of flap head
Hole, the adjustment hole connection inlet channel and pressure regulating cavity；Counter sink is provided with down at spacing block position, the macropore of counter sink is located at small
Hole bottom, floating plug is provided with the position of falling counter sink, and floating plug lower end is provided with floating plug tail, the cylindrical macropore with counter sink of floating plug tail
Cylindrical to form upper and lower guiding, the cylindrical place of floating plug tail is provided with O-ring seal, and floating plug upper end is provided with floating plug head, and floating cold head is provided with one
The floating plug sealing surface of sealing can be formed with air admission hole；Venthole is provided with inside bonnet, venthole one end communicates with outlet flow,
The other end is provided with vertical bleed outlet, and spherical check ball is provided with the upper end of the bleed outlet；
Its assembly method is as follows：
1. the assembling of valve body and valve seat：Valve seat is arranged on the inlet channel port of export, keeps sealing surface of seat level upward, uses welding rod
Stretched into from lumen, welded at the cylindrical position and valve body between of valve seat, be welded valve seat；
2. the assembling of the part such as bonnet and fairlead：It is oriented to set upper side and is fixedly welded on bonnet lower end, keeps air admission hole in bonnet
Lower section, and on the top of fairlead, spherical check ball is put into venthole by this end that venthole is communicated with outlet flow, lead to
Cross upset bonnet to adjust the direction worked off one's feeling vent one's spleen, spherical check ball is entered into bleed outlet upper end；
3. the assembling of the part such as spacing block and floating plug：Load O-ring seal at the cylindrical place of floating plug tail, floating plug is loaded spacing block
The place of falling counter sink, is fixed together floating plug head and piston tail part, and the component that spacing block and floating plug are completed loads leads
To inner chamber, spacing block is directed to inner chamber and is isolated into plunger shaft and pressure regulating cavity, and, in the top of spacing block, pressure regulating cavity is in isolation for plunger shaft
The lower section of block, keeps floating plug sealing surface to be formed with air admission hole and seals, and loads O-shaped close in the groove of the center hole wall of spacing block
Seal, loads O-ring seal at the guiding internal chamber wall at pressure regulating cavity position；
4. overall package：Flap is put into lumen, keeps valve clack sealing surface to carry out plane contact with sealing surface of seat, adjust valve
Valve axis is overlapped with valve seat axis, the component that dress sequence number 3 is completed, and valve body top is slowly mounted in fairlead mode directed downwardly,
Lumen is stretched into fairlead lower end, and flap head and flap handle are respectively protruding into pressure regulating cavity and centre bore, bonnet is fixedly mounted on valve body
Middle part upper end, keeps the sealing between bonnet and valve body；
5. pressure test：A. hydraulic pressure strength experiment：Closed valve outlet side, test(ing) medium is passed through from valve body import side, slow to rise
Strengh testing pressure is pressed onto, observation valve surface has No leakage；B. pressurized seal experiment：Air is passed through from valve outlet side, slowly
Test pressure is boosted to, there is No leakage observation valve inlet side；
6. the protecting against shock lift check valve of pass the test is dried up, outer surface japanning, storage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710218469.6A CN106838387B (en) | 2017-04-05 | 2017-04-05 | The assembly method of protecting against shock lift check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710218469.6A CN106838387B (en) | 2017-04-05 | 2017-04-05 | The assembly method of protecting against shock lift check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106838387A true CN106838387A (en) | 2017-06-13 |
| CN106838387B CN106838387B (en) | 2019-01-25 |
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ID=59142305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710218469.6A Active CN106838387B (en) | 2017-04-05 | 2017-04-05 | The assembly method of protecting against shock lift check valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN106838387B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933047A (en) * | 2021-10-15 | 2022-01-14 | 江苏卡一阀门制造有限公司 | Lifting check valve body test device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3427131A1 (en) * | 1984-07-23 | 1986-01-23 | Kraftwerk Union AG, 4330 Mülheim | Non-return valve |
| CN2563386Y (en) * | 2002-08-30 | 2003-07-30 | 陈隽 | Shock-proof check valve |
| KR20090005539U (en) * | 2009-05-19 | 2009-06-08 | 주식회사 코밸 | Valve for preventing backflow |
| CN103899805A (en) * | 2014-04-23 | 2014-07-02 | 刘工勤 | Micro-force switch valve with backflow stopping function |
| CN104455584A (en) * | 2014-11-25 | 2015-03-25 | 大连大高阀门股份有限公司 | Main water feed check valve |
-
2017
- 2017-04-05 CN CN201710218469.6A patent/CN106838387B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3427131A1 (en) * | 1984-07-23 | 1986-01-23 | Kraftwerk Union AG, 4330 Mülheim | Non-return valve |
| CN2563386Y (en) * | 2002-08-30 | 2003-07-30 | 陈隽 | Shock-proof check valve |
| KR20090005539U (en) * | 2009-05-19 | 2009-06-08 | 주식회사 코밸 | Valve for preventing backflow |
| CN103899805A (en) * | 2014-04-23 | 2014-07-02 | 刘工勤 | Micro-force switch valve with backflow stopping function |
| CN104455584A (en) * | 2014-11-25 | 2015-03-25 | 大连大高阀门股份有限公司 | Main water feed check valve |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933047A (en) * | 2021-10-15 | 2022-01-14 | 江苏卡一阀门制造有限公司 | Lifting check valve body test device |
| CN113933047B (en) * | 2021-10-15 | 2023-11-14 | 江苏卡一阀门制造有限公司 | Lifting check valve body test device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106838387B (en) | 2019-01-25 |
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Effective date of registration: 20181210 Address after: No. 111 Yandu Road, Xinhe Street, South New District, Yancheng City, Jiangsu Province, 224000 Applicant after: NEWMAN (YANCHENG) VALVE MANUFACTURING Co.,Ltd. Address before: 325115 Lixi Village, Yantou Town, Yongjia County, Wenzhou City, Zhejiang Province Applicant before: Li Xiangqing |
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Effective date of registration: 20230703 Address after: Room 206 (CNx), xifuhe digital intelligent innovation community Exhibition Center building, 49 Wengang South Road, Yannan high tech Zone, Yancheng City, Jiangsu Province Patentee after: Yancheng Yannan High-tech Zone Xifuhe Green Low-carbon Science and Technology Innovation Park Development Co.,Ltd. Address before: No. 111 Yandu Road, Xinhe Street, South New District, Yancheng City, Jiangsu Province, 224000 Patentee before: NEWMAN (YANCHENG) VALVE MANUFACTURING Co.,Ltd. |