CN111963739A - Electronic flow regulating valve and regulating method - Google Patents
Electronic flow regulating valve and regulating method Download PDFInfo
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- CN111963739A CN111963739A CN202010820011.XA CN202010820011A CN111963739A CN 111963739 A CN111963739 A CN 111963739A CN 202010820011 A CN202010820011 A CN 202010820011A CN 111963739 A CN111963739 A CN 111963739A
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- valve
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- chamber
- control valve
- valve core
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention discloses an electronic flow regulating valve and a regulating method, comprising a valve body, wherein the valve body is provided with a valve body cavity extending along the vertical direction, a piston assembly and a valve body partition plate are arranged in the valve body cavity, the piston assembly is provided with a piston body and a control valve core, the piston body is vertically opposite to the valve body partition plate, the piston body moves up and down along the valve body cavity, the interior of the valve body cavity is divided into a first sub-chamber, a second sub-chamber and a third sub-chamber by the piston body and the valve body partition plate, the control valve core is a cylinder body which is vertically penetrated to form a valve core guide hole communicated with the first sub-chamber and the third sub-chamber, a control valve needle is arranged in the valve core guide hole, and the vertical movement of the control valve needle is controlled by a linear. The invention has the beneficial effects that: has the characteristics of simple structure, convenient manufacture and high cost performance.
Description
Technical Field
The invention relates to a fluid device, in particular to an electronic flow regulating valve and a regulating method.
Background
At present, most of flow control valves in the market are direct-acting valves, such as "a direct-acting electric valve" disclosed in chinese patent application CN105090534A, which has the following disadvantages: 1. the valve core needs larger motor torque when acting; 2. the control precision is poor; 3. an additional design of the speed reducing mechanism is required.
Disclosure of Invention
The invention aims to solve the technical problem that the direct-acting electronic flow regulation in the prior art needs larger motor torque, and provides a novel electronic flow regulation valve and a regulation method.
In order to achieve the purpose, the technical scheme of the invention is as follows: an electronic flow regulating valve comprises a valve body, wherein the valve body is provided with a valve body cavity extending vertically, a piston assembly and a valve body partition plate are arranged in the valve body cavity, the piston assembly is provided with a piston body and a control valve core, the piston body is vertically opposite to the valve body partition plate, the piston body moves vertically along the valve body cavity, the valve body cavity is internally divided into a first sub-chamber, a second sub-chamber and a third sub-chamber by the piston body and the valve body partition plate, the piston body is provided with a piston bottom wall, bottom wall through holes respectively communicating the first sub-chamber with the second sub-chamber are formed in the piston bottom wall, control valve ports respectively communicating the second sub-chamber with the third sub-chamber are formed in the valve body partition plate, and bottom wall bottom holes opposite to the control valve ports are formed in the piston bottom wall, the piston is characterized in that a return spring is arranged above the bottom wall of the piston and used for providing downward elastic force for the piston body, the control valve core consists of an upper valve core section arranged in the bottom hole of the bottom wall and a lower valve core section arranged in the control valve port, the control valve core is a cylinder body which is communicated up and down to form a valve core guide hole communicated with the first sub-chamber and the third sub-chamber, a control valve needle is arranged in the valve core guide hole, and the up-and-down displacement of the control valve needle is controlled by a linear push rod.
As a preferable scheme of the electronic flow control valve, a valve body inlet communicated with the second sub-chamber and a valve body outlet communicated with the third sub-chamber are formed on the valve body.
As a preferable scheme of the electronic flow control valve, the valve body inlet is used for connecting an inflow pipeline, and the valve body outlet is used for connecting an outflow pipeline.
As a preferred scheme of the electronic flow control valve, the linear push rod extends vertically, the linear push rod is arranged above the control valve needle, the lower end of the linear push rod is fixedly connected with the upper end of the control valve needle, a threaded section is formed at the upper end of the linear push rod, and a rotating nut is surrounded by the threaded section; still include, push rod motor, rotor part in the push rod motor with rotate nut looks fixed connection.
As a preferable scheme of the electronic flow rate regulating valve, the linear push rod, the control valve needle, the control valve core, the piston body, the valve core guide hole and the control valve port all have a common axis.
As an electronic flow control valve's preferred scheme, reset spring is along vertical extension, reset spring's upper end is the stiff end, reset spring's lower extreme is the expansion end, reset spring's lower extreme with the piston diapire offsets, reset spring is compressed all the time in order to provide elasticity down.
As a preferable mode of the electronic flow control valve, the return spring further surrounds the periphery of the linear push rod, and the piston body further has a piston peripheral wall, and the lower end of the return spring is surrounded by the piston peripheral wall.
As a preferable mode of the electronic flow rate adjusting valve, the lower segment of the valve core is matched with the control valve port phase shaft hole, a valve core side hole extending along the vertical direction is formed on the lower segment of the valve core, and the flow rate of the electronic flow rate adjusting valve is determined by the part of the valve core side hole exposed to the second subchamber.
As a preferable scheme of the electronic flow control valve, the outer diameter of the upper section of the valve core is smaller than that of the lower section of the valve core, the bottom wall of the piston is located above the lower section of the valve core to form a vertical gap therebetween, a sealing ring is arranged in the vertical gap and surrounds the periphery of the upper section of the valve core, and the outer diameter of the lower section of the valve core is smaller than that of the sealing ring.
The invention also provides a regulating method of the electronic flow regulating valve, which comprises the following steps,
providing an electronic flow regulating valve; and the number of the first and second groups,
and vertically shifting the linear push rod to adjust the flow of the electronic flow regulating valve.
Compared with the prior art, the invention has the beneficial effects that: has the characteristics of simple structure, convenient manufacture and high cost performance. The push rod motor is controlled by an electronic signal to carry out flow regulation, the flow regulation is accurate, the response is fast, the motor rotates stably, the performance is reliable, the service life is long, and the push rod motor is an indispensable actuating mechanism for controlling the flow regulation to realize intelligent management.
In addition to the technical problems solved by the present invention, the technical features constituting the technical solutions, and the advantageous effects brought by the technical features of the technical solutions described above, other technical problems solved by the present invention, other technical features included in the technical solutions, and advantageous effects brought by the technical features will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view (before the piston assembly moves upward) of an embodiment of the present invention.
FIG. 2 is a schematic structural view (after the piston assembly is moved up) of an embodiment of the present invention.
Detailed Description
The invention will be described in further detail below with reference to specific embodiments and drawings. Here, the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and 2, an electronic flow control valve is shown. The electronic flow regulating valve is an actuating mechanism which is controlled by electronic signals and can realize automatic flow regulation and intelligent management. The electronic flow control valve can be applied to pipeline control of various fluids such as refrigerants, water, gas, oil, petrochemical gas and the like.
The electronic flow regulating valve comprises a valve body 1, a piston assembly 2, a linear push rod 3, a push rod motor 4 and the like.
The valve body 1 has a valve body chamber. The valve body chamber extends vertically. And a piston assembly 2 and a valve body partition plate 3 are arranged in the valve body cavity. The piston assembly 2 is composed of a piston body 21, a control valve core 22 and the like. The piston body 21 is opposite to the valve body partition plate 3 in the vertical direction. The piston body 21 is displaceable up and down along the valve body chamber. The valve body partition plate 3 is fixedly installed and can be fixedly connected with the side wall of the valve body cavity or other components. The valve body cavity is internally divided into a first chamber 11, a second chamber 12 and a third chamber 13 which are sequentially arranged from top to bottom by the piston body 21 and the valve body partition plate 3. The valve body 1 is formed with a valve body inlet 101 communicating with the second sub-chamber 12 and a valve body outlet 102 communicating with the third sub-chamber 13. The valve body inlet 101 can be connected to a feed line, i.e. the second partial chamber 12 is a high-pressure region. The valve body outlet 102 can be connected to the outflow line, i.e. the third partial chamber 13 is a low-pressure region.
The valve body partition 3 is formed with a control valve port 30. The control valve port 30 communicates with the second chamber 12 and the third chamber 13, respectively. Preferably, the control valve port 30 extends vertically.
The piston body 21 has a piston bottom wall 211 and a piston peripheral wall 212. The piston bottom wall 211 and the piston peripheral wall 212 together define an upward opening. A bottom wall through hole 2111 is formed in the piston bottom wall 211. The bottom wall through hole 2111 communicates with the first sub-chamber 11 and the second sub-chamber 12, respectively. Preferably, the bottom wall through hole 2111 is obliquely arranged. The piston bottom wall 211 is further formed with a bottom wall bottom hole 2112 facing downward to the control valve port 30.
The control spool 22 extends vertically. The control spool 22 has an upper spool section 221 and a lower spool section 222. Wherein, the outer diameter of the valve core upper section 221 is smaller than the outer diameter of the valve core lower section 222. The upper section 221 is disposed within the bottom wall bore 2112 and is axially aligned with the bottom wall bore such that the piston body 21 and the control valve spool 22 are synchronously operable. The lower spool segment 222 is disposed within the control port 30 and is axially and cooperatively configured such that the lower spool segment 222 is capable of moving up and down along the control port 30. The control valve core 22 is a cylindrical body that penetrates vertically to form a valve core guide hole 220 that communicates the first subchamber 11 and the third subchamber 13. A spool side hole 2220 extending in the vertical direction is formed in a side wall of the spool lower section 222. When the spool side hole 2220 is fully seated in the control port 30, the spool side hole 2220 is completely blocked by the control port 30 and fluid in the second sub-chamber 12 cannot flow into the third sub-chamber 13. Moving the piston assembly 2 upward, the spool side hole 2220 is gradually exposed to the second subchamber 12, at which time fluid in the second subchamber 12 passes from the spool side hole 2220 into the third subchamber 13. The flow area between the control spool 22 and the control valve port 30, which is the portion of the spool side hole 2220 exposed to the second sub-chamber 12, determines the flow rate of the electronic flow rate control valve. The larger the portion of the spool side hole 2220 exposed to the second sub-chamber 12, the larger the flow rate of the electronic flow rate regulating valve. The spool side opening 2220 may be designed with different shapes and sizes so that different flow curves (e.g., linear, exponential) may be obtained. In this embodiment, the spool side hole 2220 is a triangular hole. In other embodiments, the valve core side hole is a strip-shaped hole, a rectangular hole or the like.
The piston bottom wall 211 is positioned above the valve spool lower section 222 to form a vertical gap therebetween. A sealing ring 7 is disposed between the piston bottom wall 211 and the valve element lower section 222, and the sealing ring 7 surrounds the valve element upper section 221. The outer diameter of the sealing ring 7 is larger than the outer diameter of the lower valve core section 222. And moving the piston assembly 2 downwards until the sealing ring 7 is abutted against the valve body partition 3 up and down, wherein at the moment, the piston assembly 2 cannot move downwards any more and the piston body 21 presses the sealing ring 7 downwards to further seal the control valve port 30, so as to ensure that the control valve port 30 is completely sealed and completely closed.
The control needle 5 is located in the cartridge guide hole 220. The control valve needle 5 is of a conical structure and the tip part is downward. By changing the position of the control valve needle 5, the flow area between the control valve needle 5 and the valve core guide hole 220 can be controlled, so that the pressure of the first chamber 11 is changed to change the position of the piston body 21, and finally the purpose of controlling the flow rate of the electronic flow rate regulating valve is achieved.
The linear push rod 3 is arranged above the control valve needle 5. The linear push rod 3 extends vertically. The lower end of the linear push rod 3 is fixedly connected with the upper end of the control valve needle 5, so that the linear push rod 3 and the control valve needle 5 synchronously act. The upper end of the linear push rod 3 is driven by the push rod motor 4, and the push rod motor 4 can drive the linear push rod 3 and the control valve needle 5 to move up and down so as to change the flow passage area of the control valve needle 5 and the valve core guide hole 220.
The linear push rod 3 penetrates through the top wall of the valve body chamber. The upper end of the linear push rod 3 is provided with a thread section. The threaded section is surrounded by a rotating nut. And the rotor part in the push rod motor 4 is fixedly connected with the rotating nut. The push rod motor 4 can be a stepping motor, and the control precision is high.
A return spring 6 is arranged above the piston bottom wall 211. The return spring 6 is used to provide a downward elastic force to the piston body 21. The return spring 6 extends vertically. The return spring 6 surrounds the periphery of the linear push rod 3. The upper end of the return spring 6 is a fixed end which can be fixed on or abutted against the top wall of the valve body cavity. The lower end of the reset spring 6 is a movable end. The lower end of the return spring 6 abuts against the top surface of the piston bottom wall 211. The return spring 6 is always compressed. Preferably, the lower end of the return spring 6 is surrounded by the piston peripheral wall 212, and the outer peripheral surface of the lower end of the return spring 6 can abut against the inner peripheral surface of the piston peripheral wall 212, so as to prevent the lower end of the return spring 6 from deforming and twisting when the control valve needle is displaced, and ensure that the downward elastic force is changed smoothly.
The working principle of the electronic flow regulating valve is as follows:
in the initial state, the piston assembly 2 is in equilibrium, i.e. the upward force provided by the second chamber 12 and the third chamber 13 together on the piston assembly 2 is equal to the downward force provided by the first chamber 11 and the return spring 6 together on the piston assembly 2 (the own weight of the piston assembly 2 and other factors are not considered at all).
The increase (decrease) of the flow of the electronic flow control valve can be realized by moving the linear push rod 3 up and down. The amount of increase (decrease) of the flow rate is determined by the amount of upward (downward) movement of the linear plunger 3.
If the electronic flow control valve needs to increase the flow, the push rod motor 4 is controlled by an electronic signal to act, and the push rod motor 4 drives the linear push rod 3 to move upwards together with the control valve needle 5, so as to increase the flow area between the control valve needle 5 and the valve core guide hole 220. Since the spool guide hole 220 is a passage between the first sub-chamber 11 and the third sub-chamber 13, the pressure in the first sub-chamber 11 decreases as the flow area between the control needle 5 and the spool guide hole 220 increases. That is, at this time, the upward acting force is constant while the downward acting force is relatively decreased, and the piston assembly 2 is thus moved upward until the amount of compression of the return spring 6 is further increased to allow the elastic force to rebalance the piston assembly 2. The flow area of the control valve core 22 and the control valve port is increased in the upward movement process of the piston assembly 2, so that the purpose of increasing the flow is achieved.
If the electronic flow regulating valve needs to reduce the flow, the push rod motor 4 is controlled by an electronic signal to act, and the push rod motor 4 drives the linear push rod 3 to move downwards together with the control valve needle 5, so as to reduce the flow area between the control valve needle 5 and the valve core guide hole 220. Since the spool guide hole 220 is a passage between the first sub-chamber 11 and the third sub-chamber 13, the pressure in the first sub-chamber 11 increases as the flow area between the control needle 5 and the spool guide hole 220 decreases. That is, at this time, the upward acting force is not changed and the downward acting force is relatively increased, and the piston assembly 2 is moved downward accordingly until the compression amount of the return spring 6 is further decreased to allow the elastic force to rebalance the piston assembly 2. The piston assembly 2 reduces the flow area between the control valve core 22 and the control valve port during downward movement, so as to achieve the purpose of reducing the flow.
Based on the above, the object directly driven by the push rod motor 4 is the linear push rod 3 and the control valve needle 5, rather than the piston assembly 2, and only requires a smaller motor torque compared to the conventional direct-acting type.
The foregoing merely represents embodiments of the present invention, which are described in some detail and detail, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The electronic flow regulating valve is characterized by comprising a valve body, wherein the valve body is provided with a valve body cavity extending along the vertical direction, a piston assembly and a valve body partition plate are arranged in the valve body cavity, the piston assembly is provided with a piston body and a control valve core, the piston body is vertically opposite to the valve body partition plate, the piston body moves up and down along the valve body cavity, the valve body cavity is divided into a first sub-chamber, a second sub-chamber and a third sub-chamber by the piston body and the valve body partition plate, the piston body is provided with a piston bottom wall, bottom wall through holes respectively communicating the first sub-chamber with the second sub-chamber are formed in the piston bottom wall, a control valve port respectively communicating the second sub-chamber with the third sub-chamber is formed in the valve body partition plate, and a bottom wall bottom hole opposite to the control valve port is further formed in the piston bottom wall, a return spring is arranged above the bottom wall of the piston and used for providing downward elastic force for the piston body, the control valve core consists of an upper valve core section arranged in the bottom hole of the bottom wall and a lower valve core section arranged in the control valve port, the control valve core is a cylinder body which is communicated up and down to form a valve core guide hole communicated with the first sub-chamber and the third sub-chamber, a control valve needle is arranged in the valve core guide hole, and the up-and-down displacement of the control valve needle is controlled by a linear push rod; furthermore, the lower section of the valve core is matched with a phase shaft hole of the control valve port, a valve core side hole extending along the vertical direction is formed on the lower section of the valve core, and the part of the valve core side hole exposed to the second chamber determines the flow rate of the electronic flow regulating valve; the outer diameter of the upper section of the valve core is smaller than that of the lower section of the valve core, the bottom wall of the piston is positioned above the lower section of the valve core, so that a vertical gap is formed between the upper section of the valve core and the lower section of the valve core, a sealing ring is arranged in the vertical gap and surrounds the periphery of the upper section of the valve core, and the outer diameter of the lower section of the valve core is smaller than that of the sealing ring.
2. The electronic flow regulator of claim 1, wherein the valve body has a valve body inlet in communication with the second subchamber and a valve body outlet in communication with the third subchamber.
3. The electronic flow regulator valve of claim 2, wherein the valve body inlet is adapted to receive an inlet line and the valve body outlet is adapted to receive an outlet line.
4. The electronic flow control valve according to any one of claims 1 to 3, wherein the linear push rod extends vertically, the linear push rod is arranged above the control valve needle, the lower end of the linear push rod is fixedly connected with the upper end of the control valve needle, and a threaded section is formed at the upper end of the linear push rod and surrounds a rotating nut; still include, push rod motor, rotor part in the push rod motor with rotate nut looks fixed connection.
5. The electronic flow regulator valve of claim 4, wherein the linear pushrod, the control valve needle, the control spool, the piston body, the spool guide bore, and the control valve port all have a common axis.
6. The electronic flow regulating valve according to any one of claims 1 to 3, wherein the return spring extends vertically, an upper end of the return spring is a fixed end, a lower end of the return spring is a movable end, the lower end of the return spring abuts against the bottom wall of the piston, and the return spring is always compressed to provide the downward elastic force.
7. The electronic flow regulating valve of claim 4, wherein the return spring further surrounds the periphery of the linear push rod, the piston body further having a piston peripheral wall, the lower end of the return spring being surrounded by the piston peripheral wall.
8. The adjusting method of the electronic flow regulating valve is characterized by comprising the following steps,
providing an electronic flow regulating valve of any one of claims 1 to 7; and the number of the first and second groups,
and the linear push rod is moved up and down to change the position of the control valve needle and control the flow area between the control valve needle and the valve core guide hole, so that the pressure of the first chamber is changed to change the position of the piston body, and the aim of adjusting the flow of the electronic flow regulating valve is fulfilled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010820011.XA CN111963739A (en) | 2020-08-14 | 2020-08-14 | Electronic flow regulating valve and regulating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010820011.XA CN111963739A (en) | 2020-08-14 | 2020-08-14 | Electronic flow regulating valve and regulating method |
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| CN111963739A true CN111963739A (en) | 2020-11-20 |
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| CN202010820011.XA Pending CN111963739A (en) | 2020-08-14 | 2020-08-14 | Electronic flow regulating valve and regulating method |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201344272Y (en) * | 2009-03-15 | 2009-11-11 | 蒋可贞 | Piston type pilot-operated solenoid valve |
| CN101925768A (en) * | 2008-01-29 | 2010-12-22 | Hydac流体技术有限公司 | Piloted valve, particularly proportional throttle valve |
| CN102878136A (en) * | 2012-09-21 | 2013-01-16 | 广西柳工机械股份有限公司 | Threaded cartridge valve |
| CN103512288A (en) * | 2012-06-20 | 2014-01-15 | 浙江三花股份有限公司 | Electronic expansion valve |
| CN104633231A (en) * | 2015-01-06 | 2015-05-20 | 广东美的制冷设备有限公司 | Electromagnetic expansion valve and heat pump system with the same |
| CN206175674U (en) * | 2016-11-02 | 2017-05-17 | 珠海格力电器股份有限公司 | Flow control valve and heat pump system |
| CN108981248A (en) * | 2018-08-23 | 2018-12-11 | 方纪 | A kind of unidirectional refrigeration expansion valve of passive self-adaptive formula |
| CN109139591A (en) * | 2018-09-25 | 2019-01-04 | 中国农业大学 | A kind of adaptive pilot-operated type electric-hydraulic proportion screw-in cartridge valve of mountain and hill |
| CN109798368A (en) * | 2019-02-27 | 2019-05-24 | 苏州纽威阀门股份有限公司 | A kind of seperating range control valve |
| CN110285224A (en) * | 2019-07-03 | 2019-09-27 | 上海恒温控制器厂有限公司 | A kind of electronic flow regulating valve |
| CN110360364A (en) * | 2018-04-10 | 2019-10-22 | 盾安汽车热管理科技有限公司 | A kind of current global mechanism electric expansion valve |
| CN110630799A (en) * | 2019-06-26 | 2019-12-31 | 杭州洲钜电子科技有限公司 | Sleeve type valve core for electronic expansion valve of air conditioner |
-
2020
- 2020-08-14 CN CN202010820011.XA patent/CN111963739A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101925768A (en) * | 2008-01-29 | 2010-12-22 | Hydac流体技术有限公司 | Piloted valve, particularly proportional throttle valve |
| CN201344272Y (en) * | 2009-03-15 | 2009-11-11 | 蒋可贞 | Piston type pilot-operated solenoid valve |
| CN103512288A (en) * | 2012-06-20 | 2014-01-15 | 浙江三花股份有限公司 | Electronic expansion valve |
| CN102878136A (en) * | 2012-09-21 | 2013-01-16 | 广西柳工机械股份有限公司 | Threaded cartridge valve |
| CN104633231A (en) * | 2015-01-06 | 2015-05-20 | 广东美的制冷设备有限公司 | Electromagnetic expansion valve and heat pump system with the same |
| CN206175674U (en) * | 2016-11-02 | 2017-05-17 | 珠海格力电器股份有限公司 | Flow control valve and heat pump system |
| CN110360364A (en) * | 2018-04-10 | 2019-10-22 | 盾安汽车热管理科技有限公司 | A kind of current global mechanism electric expansion valve |
| CN108981248A (en) * | 2018-08-23 | 2018-12-11 | 方纪 | A kind of unidirectional refrigeration expansion valve of passive self-adaptive formula |
| CN109139591A (en) * | 2018-09-25 | 2019-01-04 | 中国农业大学 | A kind of adaptive pilot-operated type electric-hydraulic proportion screw-in cartridge valve of mountain and hill |
| CN109798368A (en) * | 2019-02-27 | 2019-05-24 | 苏州纽威阀门股份有限公司 | A kind of seperating range control valve |
| CN110630799A (en) * | 2019-06-26 | 2019-12-31 | 杭州洲钜电子科技有限公司 | Sleeve type valve core for electronic expansion valve of air conditioner |
| CN110285224A (en) * | 2019-07-03 | 2019-09-27 | 上海恒温控制器厂有限公司 | A kind of electronic flow regulating valve |
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