CN104100762A - Efficient pneumatic relief gate valve - Google Patents
Efficient pneumatic relief gate valve Download PDFInfo
- Publication number
- CN104100762A CN104100762A CN201410352361.2A CN201410352361A CN104100762A CN 104100762 A CN104100762 A CN 104100762A CN 201410352361 A CN201410352361 A CN 201410352361A CN 104100762 A CN104100762 A CN 104100762A
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- CN
- China
- Prior art keywords
- valve
- cylinder
- actuator chamber
- piston
- air inlet
- 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.)
- Granted
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
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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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/12—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with wedge-shaped arrangements of sealing faces
Abstract
The invention relates to a gate valve, in particular to an efficient pneumatic relief gate valve. According to the specific technical scheme, the efficient pneumatic relief gate valve comprises a valve body, a bonnet, a valve seat, a valve stem, a gate plate linked with the valve stem and a pneumatic device. The valve body is provided with a medium incoming passage, a medium outflow passage and a connecting passage. The pneumatic device comprises an air source, a cylinder and an electromagnetic valve whereby the cylinder and the gas source are connected. A piston is disposed inside the cylinder and is linked with one end, extending out of the bonnet, of the valve stem. The cylinder is internally provided with an opening drive cavity and a closing drive cavity. The cylinder is provided with an opening air pass opening at the opening drive cavity and a closing gas pass opening at the closing drive cavity. An elastic butting member, with one end in butt joint with the piston and the other end in butt joint with the bonnet, is disposed inside the opening drive cavity. A pneumatic control valve is disposed between the electromagnetic valve and the opening drive cavity and closing drive cavity of the cylinder. The efficient pneumatic relief gate valve according to the technical scheme is wear resistant, leak proof, deformation proof, and capable of stably running.
Description
Technical field
The present invention relates to a kind of gate valve, particularly a kind of high effect of reducing pressure Pneumatic gate valve.
Background technique
Gate valve is that one is realized and closed or open by flashboard, thus the valve of cut-off pipeline medium.Adopt the gate valve of pneumatic mode control conventionally need on the valve body of gate valve, cylinder be installed, in cylinder, be provided with the piston that can move along cylinder inner cavity axial reciprocating, the valve rod of piston and valve body is connected, Pneumatic actuator be generally the source of the gas for exporting source of the gas and be located at source of the gas and cylinder between solenoid valve, the flashboard of gate valve is implemented lifting by piston actuated valve rod in valve body, forms the unlatching of gate valve or closes with this, but, gate valve opening force is different from the power of closing, especially for Wedge gate valve, what the power of closing will arrange conventionally is smaller, as long as can guarantee the sealing of flashboard sealing surface, if the power of closing of gate valve is too large, flashboard sealing surface and sealing surface of seat frictional force are excessive on the one hand easily causes that sealing surface scratch damages, second aspect easily causes that valve seat and flashboard sealing surface damage because of excessive deformation, the 3rd aspect shaft length is longer, excessive axial pressure easily produces bending deflection, the 4th aspect even can cause the excessive stretching of flange bolt in gate valve and damage and the seal leakage of middle flange.Under any circumstance can both open in order to ensure gate valve, gate valve need to arrange larger opening force conventionally, and particularly at high temperature, due to the thermal expansion of material, it is tightr that flashboard and valve seat can be fitted, and therefore needs larger opening force.
For common Pneumatic gate valve, it is essentially identical closing power and opening force, and due to the existence of valve rod, the power of closing that the gas medium of Pneumatic gate valve acts on piston is also larger than opening force, therefore, common Pneumatic gate valve, because opening force is less, in using process, gate valve after closing often can not be guaranteed to open, open in order to make gate valve, normally heighten the bleed pressure of Pneumatic actuator, but, too high bleed pressure, tend to cause that the power of closing of gate valve is excessive, thereby produce a series of problem, therefore, there is the problem of closing power and opening force contradiction in conventional Pneumatic gate valve, cause Pneumatic gate valve often to occur variety of issue.
Summary of the invention
The deficiency existing for prior art, the invention provides a kind of anti-wear, leakage, distortion, stable high effect of reducing pressure Pneumatic gate valve.
For achieving the above object, the invention provides following technological scheme: a kind of high effect of reducing pressure Pneumatic gate valve, include valve body, valve gap and Pneumatic actuator, described valve body is provided with medium inlet passage, the connecting passage of medium flow pass and connecting media inlet passage and medium flow pass, the joining place of medium inlet passage and medium flow pass and connecting passage is provided with valve seat, in connecting passage, be provided with can with the flashboard of valve base sealing, valve gap place is provided with one end and extends in connecting passage and be connected with flashboard, the other end extends to outer valve rod, Pneumatic actuator includes source of the gas, the solenoid valve of the changeable air flue of cylinder and connection cylinder and source of the gas, in cylinder, be provided with piston, one end that piston and valve rod extend to outside valve gap is connected, in cylinder, be provided with actuator chamber, wherein, be positioned at the actuator chamber of piston bottom for opening actuator chamber, be positioned at the actuator chamber on piston top for closing actuator chamber, the unlatching actuator chamber place of cylinder is provided with the unlatching air inlet/outlet being connected with solenoid valve by pipeline, close actuator chamber place and be provided with the air inlet/outlet of closing being connected with solenoid valve by pipeline, it is characterized in that: in described unlatching actuator chamber, be provided with one end and piston and conflict, the elasticity press part that the other end and valve gap are conflicted, the unlatching actuator chamber of described solenoid valve and cylinder and close and be provided with the Pneumatic valve by electromagnetic valve between actuator chamber.
Adopt technique scheme, by being set in the unlatching actuator chamber in cylinder, one end and piston conflict, the elasticity press part that the other end and valve gap are conflicted, in the time that the source of the gas of source of the gas enters in unlatching actuator chamber by pipeline by opening air inlet/outlet, the air pressure of closing in actuator chamber of cylinder is discharged from, air pressure in opening actuator chamber is implemented to conflict to piston, elasticity press part has lost the constraint of the air pressure of closing in actuator chamber to it simultaneously, can assist gas pressure fast by piston jack-up, make piston (being the actuator chamber of closing of cylinder) movement fast towards cylinder top, when moving, is with in piston ovable valve stem and flashboard to rise in valve body, make medium inlet passage and the conducting of medium flow pass of valve body, valve is in opening state, in this process, due to the effect that compresses of elasticity press part, the elastic force of elasticity press part, in conjunction with the atmospheric pressure of source of the gas, makes the unlatching dynamics of valve become large, when the source of the gas of source of the gas is entered into while closing in actuator chamber by closing air inlet/outlet by pipeline, air pressure in the unlatching actuator chamber of cylinder is discharged from, air pressure is implemented to conflict to piston, also need to overcome the elastic force of elasticity press part simultaneously, the closing pressure of valve is reduced, flashboard enters in connecting passage completely, impels the medium inlet passage of valve body and medium to flow out channel enclosed, and valve is in closed condition, in this process, traditional valve opening suffered driving pressure when closing is consistent, when valve closing can be caused, between flashboard and valve seat, there is friction or collision and valve rod bending deflection, in order to prevent that this type of situation from occurring, valve is in closing process, entering into the air pressure of closing actuator chamber not only needs piston to compress, also need to overcome the elastic force of elasticity press part simultaneously, the kinetic energy of air pressure is consumed, the pressure of piston in closing process diminishes, thereby to the flashboard in valve, valve seat and valve rod have played protective action, can effectively prevent that valve body from wearing and tearing, leak and distortion.
The present invention is further set to: elasticity press part includes to be located at and opens in actuator chamber and Compress Spring that axially one end and piston conflict, the other end and valve gap are conflicted, and piston is provided with the end face of this Compress Spring conflict the spring seat that supplies Compress Spring to locate.
Adopt technique scheme, elasticity press part is set as to Compress Spring, arrange so simple in structure, easy for installationly, the setting of piston upper spring seat can be effectively implemented location to the axial position of Compress Spring, prevents that Compress Spring is subjected to displacement and has influence on unlatching or the closing pressure of valve.
The present invention is further set to: Pneumatic valve include with the air inlet port of source of the gas conducting, by solenoid-driven can with the conducting of air inlet port or with valve opening air inlet and outlet end mouth and the valve closing air inlet and outlet end mouth of outside conducting, valve opening air inlet and outlet end mouth and the valve closing air inlet and outlet end mouth unlatching air inlet/outlet by connecting pipeline and cylinder and close air inlet/outlet conducting respectively.
Adopt technique scheme, because the aperture of solenoid valve is mostly less, air inflow is little, and driving pressure cannot be guaranteed, if adopt the larger solenoid valve of bore, can make cost of production improve, the present invention has separately established Pneumatic valve, and Pneumatic valve is cheap, and solenoid valve implements as the port of controlling in Pneumatic valve the switch switching, not only easy to operate, and working state when making the unlatching of valve or closing is more stable.
Below in conjunction with accompanying drawing, the invention will be further described.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the structural representation of Pneumatic actuator in the embodiment of the present invention.
Embodiment
As Fig. 1, a kind of high effect of reducing pressure Pneumatic gate valve shown in Fig. 2, include valve body 1, valve gap 2 and Pneumatic actuator 3, valve body 1 is provided with medium inlet passage 11, the connecting passage 13 of medium flow pass 12 and connecting media inlet passage 11 and medium flow pass 12, medium inlet passage 11 and medium flow pass 12 are provided with valve seat 4 with the joining place of connecting passage 13, in connecting passage 13, be provided with the flashboard 5 that can seal with valve seat 4, valve gap 2 places are provided with one end and extend in connecting passage 13 and be connected with flashboard 5, the other end extends to outer valve rod 6, Pneumatic actuator 3 includes source of the gas 31, the solenoid valve 33 of the changeable air flue of cylinder 32 and connection cylinder 32 and source of the gas 31, source of the gas 31 is made up of air pump and gas tank, in cylinder 32, be provided with piston 34, piston 34 is connected with one end that valve rod 6 extends to outside valve gap 2, in cylinder 32, be provided with actuator chamber, wherein, be positioned at the actuator chamber of piston 34 bottoms for opening actuator chamber 321, be positioned at the actuator chamber on piston 34 tops for closing actuator chamber 322, unlatching actuator chamber 321 places of cylinder 32 are provided with the unlatching air inlet/outlet 323 being connected with solenoid valve 33 by pipeline 7, close actuator chamber 322 places be provided be connected with solenoid valve 33 by pipeline 7 close air inlet/outlet 324, open and be provided with one end in actuator chamber 321 and piston 34 is conflicted, the elasticity press part 8 that the other end and valve gap 2 are conflicted, the unlatching actuator chamber 321 of solenoid valve 33 and cylinder 32 and close and be provided with the Pneumatic valve 9 of controlling by solenoid valve 33 between actuator chamber 322.In such scheme, one end is set and piston 34 is conflicted by the unlatching actuator chamber 321 in cylinder 32 is interior, the elasticity press part 8 that the other end and valve gap 2 are conflicted, when the source of the gas of source of the gas 31 is entered into and opens actuator chamber 321 when interior by opening air inlet/outlet 323 by pipeline 7, the air pressure of closing in actuator chamber 322 of cylinder 32 is discharged from, air pressure in opening actuator chamber 321 is implemented to conflict to piston 34, elasticity press part 8 has lost the constraint of the air pressure of closing in actuator chamber 322 to it simultaneously, can assist gas pressure by piston 34 jack-up, make piston 34 fast towards cylinder 32 tops (be cylinder 32 close actuator chamber 322) mobile, when moving, is with in piston 34 ovable valve stem 6 and flashboard 5 in the interior rise of valve body 1, make the medium inlet passage 11 and 12 conductings of medium flow pass of valve body 1, valve is in opening state, in this process, due to the effect that compresses of elasticity press part 8, the air pressure that source of the gas 31 is exported combines the elastic pressure of elasticity press part 8, makes the cracking pressure of valve become large, when the source of the gas of source of the gas 31 is entered into and closes actuator chamber 322 when interior by closing air inlet/outlet 324 by pipeline 7, air pressure in the unlatching actuator chamber 321 of cylinder 32 is discharged from, air pressure is implemented to conflict to piston 34, also need to overcome the elastic force of elasticity press part 8 simultaneously, the closing pressure of valve is reduced, flashboard 5 enters in connecting passage 13 completely, impels the medium inlet passage 11 of valve body 1 to seal with medium flow pass 12, and valve is in closed condition, in this process, because valve opening suffered driving air pressure when closing is consistent, when valve closing can be caused, between flashboard 5 and valve seat 4, there are friction or collision and valve rod 6 bending deflections, in order to prevent that this type of situation from occurring, valve is in closing process, entering into the air pressure of closing actuator chamber 322 not only needs piston 34 to compress, also need to overcome the elastic force of elasticity press part 8 simultaneously, the kinetic energy of air pressure is consumed, thereby reduce the closing pressure of valve, to the flashboard 5 in valve, valve seat 4 and valve rod 6 have played protective action, can effectively prevent that valve body 1 from wearing and tearing, leak and distortion.It should be noted that, form sealing in order to make the unlatching actuator chamber 321 of cylinder 32 and to close between actuator chamber 322, stablize cracking pressure and the closing pressure of valve body 1, between the outer circumferential face of piston 34 and the inwall of cylinder 32, be provided with seal ring 341.
In embodiments of the present invention, for the ease of installing, elasticity press part 8 includes to be located at and opens in actuator chamber 321 and Compress Spring that axially one end and piston 34 conflicts, the other end and valve gap 2 are conflicted, and piston 34 is provided with the end face that this Compress Spring is conflicted the spring seat 342 that supplies Compress Spring to locate.The setting of spring seat 342 can be effectively implemented location to the axial position of Compress Spring, prevents that Compress Spring is subjected to displacement and has influence on unlatching or the closing pressure of valve.This spring seat 342 is one-body molded with piston 34, arranges like this and is convenient to processing and installs, and also can avoid spring seat 342 and piston 34 to come off simultaneously and cause Compress Spring cannot implement the situation of location.
In embodiments of the present invention, because the aperture of solenoid valve 33 is mostly less, the air pressure in source of the gas 31 is directly entered in cylinder 32 and sometimes cannot be driven piston 34 by solenoid valve 33; Pneumatic valve 9 in the embodiment of the present invention include with the air inlet port 91 of source of the gas 31 conductings, by solenoid valve 33 drive can with 91 conductings of air inlet port or with valve opening air inlet and outlet end mouth 92 and the valve closing air inlet and outlet end mouth 93 of outside conducting, valve opening air inlet and outlet end mouth 92 and the valve closing air inlet and outlet end mouth 93 unlatching air inlet/outlet 323 by connecting pipeline and cylinder 32 and close air inlet/outlet 324 conductings respectively.Solenoid valve 33 implements as the port of controlling in Pneumatic valves 9 switch switching, not only easy to operate, and working state when making the unlatching of valve or closing is more stable.
Claims (3)
1. a high effect of reducing pressure Pneumatic gate valve, include valve body, valve gap and Pneumatic actuator, described valve body is provided with medium inlet passage, the connecting passage of medium flow pass and connecting media inlet passage and medium flow pass, the joining place of medium inlet passage and medium flow pass and connecting passage is provided with valve seat, in connecting passage, be provided with can with the flashboard of valve base sealing, valve gap place is provided with one end and extends in connecting passage and be connected with flashboard, the other end extends to outer valve rod, Pneumatic actuator includes source of the gas, the solenoid valve of the changeable air flue of cylinder and connection cylinder and source of the gas, in cylinder, be provided with piston, one end that piston and valve rod extend to outside valve gap is connected, in cylinder, be provided with actuator chamber, wherein, be positioned at the actuator chamber of piston bottom for opening actuator chamber, be positioned at the actuator chamber on piston top for closing actuator chamber, the unlatching actuator chamber place of cylinder is provided with the unlatching air inlet/outlet being connected with solenoid valve by pipeline, close actuator chamber place and be provided with the air inlet/outlet of closing being connected with solenoid valve by pipeline, it is characterized in that: in described unlatching actuator chamber, be provided with one end and piston and conflict, the elasticity press part that the other end and valve gap are conflicted, the unlatching actuator chamber of described solenoid valve and cylinder and close and be provided with the Pneumatic valve by electromagnetic valve between actuator chamber.
2. high effect of reducing pressure Pneumatic gate valve according to claim 1, it is characterized in that: described elasticity press part includes to be located at and opens in actuator chamber and Compress Spring that axially one end and piston conflict, the other end and valve gap are conflicted, and piston is provided with the end face of this Compress Spring conflict the spring seat that supplies Compress Spring to locate.
3. high effect of reducing pressure Pneumatic gate valve according to claim 1 and 2, it is characterized in that: described Pneumatic valve include with the air inlet port of source of the gas conducting, by solenoid-driven can with the conducting of air inlet port or with valve opening air inlet and outlet end mouth and the valve closing air inlet and outlet end mouth of outside conducting, valve opening air inlet and outlet end mouth and the valve closing air inlet and outlet end mouth unlatching air inlet/outlet by connecting pipeline and cylinder and close air inlet/outlet conducting respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410352361.2A CN104100762B (en) | 2014-07-23 | 2014-07-23 | High effect of reducing pressure Pneumatic gate valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410352361.2A CN104100762B (en) | 2014-07-23 | 2014-07-23 | High effect of reducing pressure Pneumatic gate valve |
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| Publication Number | Publication Date |
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| CN104100762A true CN104100762A (en) | 2014-10-15 |
| CN104100762B CN104100762B (en) | 2016-05-11 |
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| CN201410352361.2A Active CN104100762B (en) | 2014-07-23 | 2014-07-23 | High effect of reducing pressure Pneumatic gate valve |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104565503A (en) * | 2015-01-09 | 2015-04-29 | 中国船舶重工集团公司第七0四研究所 | Hydraulic gate valve opening/closing control structure |
| CN105697852A (en) * | 2016-04-20 | 2016-06-22 | 正洲泵阀制造有限公司 | Pneumatic slow-closing control device for butterfly valve |
| CN108006247A (en) * | 2017-11-01 | 2018-05-08 | 繁昌县金科机电科技股份有限公司 | A kind of electric-controlled type of detectable flow flows backwards valve body |
| CN110486489A (en) * | 2019-08-01 | 2019-11-22 | 海瑞恩自动化科技（昆山）有限公司 | A kind of gas control linkage valve gear |
| CN110500418A (en) * | 2019-08-07 | 2019-11-26 | 安徽省屯溪高压阀门有限公司 | A kind of automatic control big caliber quick shut-off bellows gate valve |
| CN110848447A (en) * | 2019-12-13 | 2020-02-28 | 汇乐因斯福环保安全研究院（苏州）有限公司 | Pneumatic type active explosion-proof gate valve and explosion-proof method |
| CN111828721A (en) * | 2020-07-28 | 2020-10-27 | 广西柳州钢铁集团有限公司 | Pneumatic butterfly valve control method |
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| CN2157362Y (en) * | 1993-01-06 | 1994-02-23 | 荆加福 | Automatic backwater controlling valve for micropressure and atmospheric hot-water boiler |
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| CN103899828A (en) * | 2014-03-27 | 2014-07-02 | 超达阀门集团股份有限公司 | Single-acting pneumatic device with adjustment and fault security functions |
| CN203963203U (en) * | 2014-07-23 | 2014-11-26 | 超达阀门集团股份有限公司 | High effect of reducing pressure Pneumatic gate valve |
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2014
- 2014-07-23 CN CN201410352361.2A patent/CN104100762B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3958592A (en) * | 1974-02-06 | 1976-05-25 | Willis Oil Tool Co. | Safety shut-off valve |
| US4585207A (en) * | 1985-09-03 | 1986-04-29 | Joy Manufacturing Company | Expanding gate valve with pneumatic actuator |
| CN2157362Y (en) * | 1993-01-06 | 1994-02-23 | 荆加福 | Automatic backwater controlling valve for micropressure and atmospheric hot-water boiler |
| CN201787101U (en) * | 2010-08-12 | 2011-04-06 | 承德江钻石油机械有限责任公司 | Pneumatic parallel gate valve |
| CN202100763U (en) * | 2011-05-18 | 2012-01-04 | 陆桂义 | Pneumatic two-position four-way slide valve |
| CN203176506U (en) * | 2013-02-27 | 2013-09-04 | 江汉大学 | Manual operation and hydraulic pressure combined normally-open valve |
| CN103899828A (en) * | 2014-03-27 | 2014-07-02 | 超达阀门集团股份有限公司 | Single-acting pneumatic device with adjustment and fault security functions |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104565503A (en) * | 2015-01-09 | 2015-04-29 | 中国船舶重工集团公司第七0四研究所 | Hydraulic gate valve opening/closing control structure |
| CN105697852A (en) * | 2016-04-20 | 2016-06-22 | 正洲泵阀制造有限公司 | Pneumatic slow-closing control device for butterfly valve |
| CN108006247A (en) * | 2017-11-01 | 2018-05-08 | 繁昌县金科机电科技股份有限公司 | A kind of electric-controlled type of detectable flow flows backwards valve body |
| CN110486489A (en) * | 2019-08-01 | 2019-11-22 | 海瑞恩自动化科技（昆山）有限公司 | A kind of gas control linkage valve gear |
| CN110500418A (en) * | 2019-08-07 | 2019-11-26 | 安徽省屯溪高压阀门有限公司 | A kind of automatic control big caliber quick shut-off bellows gate valve |
| CN110500418B (en) * | 2019-08-07 | 2024-04-12 | 安徽省屯溪高压阀门股份有限公司 | Automatic control large-caliber quick-cutting corrugated pipe gate valve |
| CN110848447A (en) * | 2019-12-13 | 2020-02-28 | 汇乐因斯福环保安全研究院（苏州）有限公司 | Pneumatic type active explosion-proof gate valve and explosion-proof method |
| CN110848447B (en) * | 2019-12-13 | 2023-11-24 | 汇乐因斯福环保安全研究院（苏州）有限公司 | Pneumatic active explosion-proof gate valve and explosion-proof method |
| CN111828721A (en) * | 2020-07-28 | 2020-10-27 | 广西柳州钢铁集团有限公司 | Pneumatic butterfly valve control method |
Also Published As
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| CN104100762B (en) | 2016-05-11 |
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Denomination of invention: Efficient pneumatic relief gate valve Effective date of registration: 20200416 Granted publication date: 20160511 Pledgee: China Minsheng Banking Corp Wenzhou branch Pledgor: CHAODA VALVE GROUP Co.,Ltd. Registration number: Y2020330000169 |