CN113623426B - switching valve - Google Patents

switching valve Download PDF

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Publication number
CN113623426B
CN113623426B CN202010381030.7A CN202010381030A CN113623426B CN 113623426 B CN113623426 B CN 113623426B CN 202010381030 A CN202010381030 A CN 202010381030A CN 113623426 B CN113623426 B CN 113623426B
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CN
China
Prior art keywords
damping
sliding block
sleeve
valve body
chamber
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Active
Application number
CN202010381030.7A
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Chinese (zh)
Other versions
CN113623426A (en
Inventor
俞舟
马彦婷
康志军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dunan Environment Technology Co Ltd
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Dunan Environment Technology Co Ltd
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Publication date
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Priority to CN202010381030.7A priority Critical patent/CN113623426B/en
Publication of CN113623426A publication Critical patent/CN113623426A/en
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Publication of CN113623426B publication Critical patent/CN113623426B/en
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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
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
    • 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
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
    • 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
    • F16K47/00—Means in valves for absorbing fluid energy
    • F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Valves (AREA)

Abstract

The invention discloses a switching valve which comprises a valve body with a valve cavity, four connecting pipes which are arranged on the valve body and communicated with the valve cavity, and a sliding block assembly, wherein the valve body is provided with a valve cavity; the sliding block assembly can reciprocate in the valve cavity; the switching valve further comprises a damping structure, wherein the damping structure is arranged at the end part of the valve body and can act on the sliding block assembly in a moving state to stabilize the moving speed of the sliding block assembly. The damping structure is used for acting on the sliding block component in a moving state to stabilize the moving speed of the sliding block component in the valve body, so that vibration generated when the sliding block component moves in the valve body is reduced, the damping structure has the effect of reducing noise, and the quality of the whole switching valve product is improved.

Description

Switching valve
Technical Field
The invention belongs to the technical field related to air conditioning technology, and particularly relates to a switching valve.
Background
The switching valve, also called a forced valve, is a pneumatic switching valve arranged at the hot end of the switching heat exchanger (or cold accumulator), and the valve plate is opened and closed by utilizing the connecting rod structure principle. The four-way valve is a common one in switching valves, and is a control valve with four oil ports. The four-way valve is an indispensable component in refrigeration equipment, and the working principle of the four-way valve is that when a solenoid valve coil is in a power-off state, a pilot slide valve is driven by a right-side compression spring to move left, high-pressure gas enters a right-side piston cavity after entering a capillary tube, on the other hand, gas in a left-side piston cavity is discharged, and because of pressure difference at two ends of a piston, the piston and a main slide valve move left, an exhaust pipe is communicated with an outdoor unit connecting pipe, and the other two connecting pipes are communicated to form refrigeration circulation. When the solenoid valve coil is in an electrified state, the pilot slide valve moves rightwards under the action of magnetic force generated by the solenoid valve coil to overcome the tension of the compression spring, high-pressure gas enters the left-end piston cavity after entering the capillary tube, on the other hand, the gas in the right-end piston cavity is discharged, and the piston and the main slide valve move rightwards due to the pressure difference at the two ends of the piston, so that the exhaust pipe is communicated with the connecting pipes of the indoor unit, and the other two connecting pipes are communicated to form a heating cycle.
At present, the existing four-way valve is applied to refrigeration equipment, and a sliding block assembly moves in the four-way valve to realize reversing operation of the four-way valve. However, the moving slide block assembly can generate a speed oscillation phenomenon in the reversing process, so that the slide block assembly can generate vibration in the reversing process, and noise is generated. That is, the existing four-way valve has reversing noise, and the quality of the whole product of the four-way valve is reduced.
Disclosure of Invention
Based on this, it is necessary to provide a switching valve against the technical problems existing in the prior art.
The switching valve comprises a valve body with a valve cavity, a plurality of connecting pipes which are arranged on the valve body and communicated with the valve cavity, and a sliding block assembly; the sliding block assembly can reciprocate in the valve cavity; the switching valve further comprises a damping structure, wherein the damping structure is arranged at the end part of the valve body and can act on the sliding block assembly in a moving state to stabilize the moving speed of the sliding block assembly.
As a preferable scheme of the invention, the valve cavity of the valve body is divided into a first cavity, a second cavity and a third cavity in sequence by the sliding block component; the damping structure is arranged at one end of the valve body and is communicated with the first chamber or the third chamber; or, the number of the damping structures is two, and the two damping structures are respectively positioned at two ends of the valve body and are respectively communicated with the first chamber and the third chamber.
As a preferable scheme of the invention, the damping structure comprises a damping sleeve fixedly connected with the valve body and a damping rod fixedly connected with the sliding block assembly; the sliding block assembly can drive the damping rod to extend into the damping sleeve, and the damping rod and the damping sleeve are matched to form a damping force which acts on the sliding block assembly reversely.
As a preferable scheme of the invention, the damping force formed by the cooperation of the damping rod and the damping sleeve is in direct proportion to the speed of the sliding block assembly driving the damping rod to move.
As a preferable mode of the invention, the damping rod comprises a connecting rod part fixedly connected with the sliding block assembly and a damping part arranged on the connecting rod part and matched with the damping sleeve, and the sliding block assembly can drive the damping part to reciprocate relative to the damping sleeve through the connecting rod part.
As a preferable mode of the invention, the damping part is attached to the inner wall of the damping sleeve, and the damping part is matched with the damping sleeve and forms a damping gap.
As a preferable mode of the invention, the damping part can compress the gas in the damping sleeve when moving in the damping sleeve, wherein the damping part is provided with a balance hole.
As a preferable scheme of the invention, the damping part is matched with the damping sleeve, a damping gap is formed, and a balance hole is formed on the damping part.
As a preferable mode of the present invention, the switching valve further includes a connection pipe, and the connection pipe is connected to the first chamber and the third chamber.
As a preferable scheme of the invention, the sleeve opening edge of the damping sleeve is bent towards the direction of the sliding block assembly and is formed into a bending part, and the damping sleeve is fixedly connected with the valve body through the bending part.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the switching valve provided by the invention has the advantages that the damping structure is used for acting on the sliding block component in a moving state to stabilize the moving speed of the sliding block component in the valve body, so that the vibration generated when the sliding block component moves in the valve body is reduced, the noise reduction effect is realized, and the quality of the whole product of the switching valve is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a switching valve according to an embodiment of the present invention, in which the number of damping structures is two.
Fig. 2 is a schematic structural diagram of a switching valve according to an embodiment of the present invention, wherein the number of damping structures is one.
Fig. 3 is a schematic structural diagram of a switching valve according to an embodiment of the present invention, in which a balance hole is formed on a damping portion and cooperates with a damping sleeve to form a damping gap.
Fig. 4 is a schematic structural diagram of another use state of the switching valve provided in fig. 3.
10, a valve body; 20. connecting pipe; 30. a slider assembly; 40. a damping structure; 41. a damping sleeve; 411. a bending part; 42. a damping rod; 421. a connecting rod portion; 422. a damping portion; 50. a connecting pipe; 101. a first chamber; 102. a second chamber; 103. a third chamber; 201. damping gap; 202. balance holes.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1-4, a switching valve according to an embodiment of the present invention includes a valve body 10 having a valve cavity, a plurality of connection pipes 20 disposed on the valve body 10 and communicating with the valve cavity, and a slider assembly 30. The switching valve of the present embodiment is preferably a four-way valve, and accordingly, the number of the connection pipes 20 is four.
It will be appreciated that the four connection pipes 20 are connected in pairs when assembled to the valve body 10, and two passages are formed; when the sliding block assembly 30 is arranged in the valve cavity of the valve body 10 to reciprocate relative to the valve body 10, two passages formed by the four connecting pipes 20 matched with the valve body 10 can be switched through the sliding block assembly 30. It should be noted that, the sliding block assembly 30, two passages formed by the four connection pipes 20 and the valve body 10 in the switching valve of the present embodiment, and the sliding block assembly 30 moving in the valve body 10 can realize the switching between the two passages of the switching valve, which are all conventional switching valve structures in the prior art, and will not be described herein.
The slider assembly 30 is disposed in the valve cavity of the valve body 10, and can divide the valve cavity of the valve body 10 into a first chamber 101, a second chamber 102 and a third chamber 103.
In this embodiment, the switching valve of the present embodiment further includes a damping structure 40, and the damping structure 40 is provided at an end portion of the valve body 10 and can act on the slider assembly 30 in a moving state to stabilize a moving speed of the slider assembly 30. That is, when the speed of the movement of the slider assembly 30 within the valve body 10 is too high, the damping force of the damping structure 40 acting on the slider assembly 30 increases to limit the speed of the slider assembly 30; and when the speed of the movement of the slider assembly 30 in the valve body 10 is too slow, the damping force of the damping structure 40 acting on the slider assembly 30 is reduced, thereby acting as a function of the damping structure 40 to stabilize the speed of the movement of the slider assembly 30 in the valve body 10. The end of the valve body 10 is an end of the valve body 10 in the axial direction of the valve body 10.
The number of damping structures 40 in the present embodiment may be one or two according to the requirements of use.
Specifically, when the number of the damping structures 40 is one, the damping structures 40 are disposed at one end of the valve body 10 and are in communication with the first chamber 101 or the third chamber 103, that is, the damping structures 40 may be disposed at the end of the valve body where the first chamber 101 or the third chamber 103 is located; when the number of the damping structures 40 is two, the two damping structures 40 are respectively located at two ends of the valve body 10 and are respectively communicated with the first chamber 101 and the third chamber 103, that is, one damping structure 40 is located at the end of the valve body 10 where the first chamber 101 is located, and the other damping structure 40 is located at the end of the valve body 10 where the third chamber 103 is located.
In the present embodiment, the damping structure 40 of the present embodiment includes a damping sleeve 41 fixedly connected to the valve body 10, and a damping rod 42 fixedly connected to the slider assembly 30. When the sliding block assembly 30 moves in the valve body 10, the sliding block assembly 30 can drive the damping rod 42 to extend into the damping sleeve 41, in the process, the damping rod 42 and the damping sleeve 41 cooperate to form a damping force which acts on the sliding block assembly 30 reversely, and the speed of the sliding block assembly 30 is regulated by utilizing the damping force, so that the function of stabilizing the moving speed of the sliding block assembly 30 is achieved. It should be noted that, the damping force generated by the cooperation of the damping rod 42 and the damping sleeve 41 directly acts on the damping rod 42 in opposite directions, and is transferred to the slider assembly 30 through the damping rod 42, so as to stabilize the movement speed of the slider assembly 30.
The sleeve opening edge of the damping sleeve 41 is bent towards the direction of the slider assembly 30 and is formed into a bending portion 411, the damping sleeve 41 is fixedly connected to the valve body 10 through the bending portion 411, and the bending portion 411 of the damping sleeve 41 and the valve body 10 can be connected and fixed in a welding manner.
The damping force formed by the cooperation of the damping rod 42 and the damping sleeve 41 in the embodiment is proportional to the speed at which the sliding block assembly 30 drives the damping rod 42 to move. That is, the damping force applied to the slider assembly 30 when the damping structure 40 of the present embodiment is operated can be adaptively adjusted according to the movement speed of the slider assembly 30, thereby stabilizing the movement speed of the slider assembly 30.
In the present embodiment, the damper rod 42 includes a connection rod portion 421 fixedly connected to the slider assembly 30, and a damper portion 422 provided on the connection rod portion 421 and engaged with the damper sleeve 41, and the slider assembly 30 can drive the damper portion 422 to reciprocate relative to the damper sleeve 41 through the connection rod portion 421. So that the damping structure 40 can generate a damping force acting on the slider assembly 30 by using the cooperation between the damping portion 422 and the damping sleeve 41 when in operation.
Specifically, the damping portion 422 is attached to the inner wall of the damping sleeve 41, and the damping portion 422 is matched with the damping sleeve 41 and forms a damping gap 201, so that when the slider assembly 30 drives the damping portion 422 on the damping rod 42 to reciprocate relative to the damping sleeve 41, the damping gap 201 can be utilized to generate the damping force, and the damping structure 40 is assembled on the switching valve, and the purpose of stabilizing the moving speed of the slider assembly 30 by adjusting the damping gap 201 can be achieved by the damping structure 40. The damping gap 201 is an assembly gap when the damping portion 422 and the damping sleeve 41 are attached to each other, and the damping forces generated by different assembly gaps are different for the slider assembly 30, so as to stabilize the movement speed of the slider assembly 30.
Or, the damping part 422 can compress the gas in the damping sleeve 41 when moving in the damping sleeve 41, wherein the damping part 422 is provided with the balance hole 202, so that when the damping part 422 compresses the gas in the damping sleeve 41, the compressed gas in the damping sleeve 41 can flow outwards from the balance hole 202, and the damping force is generated by the reaction force of the gas when the damping part 422 compresses the gas, so that the balance hole can adjust the attack force generated by the compressed gas, namely realize the adjustment function of the damping force; similarly, the damping structure 40 can utilize the balance hole 202 to provide different positions and apertures on the damping portion 422, and correspondingly generate different damping forces on the slider assembly 30, so as to satisfy the function of stabilizing the movement speed of the slider assembly 30.
Alternatively, the damper portion 422 is fitted to the damper sleeve 41, a damper gap 201 is formed, and the damper portion 422 is provided with a balance hole 202. When the slider assembly 30 drives the damping portion 422 of the damping rod 42 to reciprocate relative to the damping sleeve 41, the damping force can be generated by the damping gap 201 and the gas reaction force generated when the gas in the damping sleeve 41 is compressed; similarly, the damping force can be specifically adjusted by adjusting the damping gap 201 and the balance hole 202, which will not be described herein.
As can be seen from the above, when the damping structure 40 of the present embodiment is used, different damping clearances 201 and balance holes 202 can be selected according to the use requirement to achieve the adjustment of different damping forces of the slider assembly 30, so as to stabilize the movement speed of the slider assembly 30.
In addition, it should be noted that the switching valve of the present embodiment further includes a connection pipe 50, where the connection pipe 50 is connected to the first chamber 101 and the third chamber 103, so that when the slider assembly 30 drives the damping rod 42 to extend into the damping sleeve 41, the gas in the damping sleeve 41 compressed by the damping portion 422 on the damping rod 42 can flow into the first chamber 101 or the third chamber 103 through the connection pipe 50, thereby realizing gas circulation in the first chamber 101 and the third chamber 103 of the switching valve. Of course, the communication relationship between the connection pipe 50 and the valve body 10 is not limited to the one shown in the drawings, and it is possible for a person skilled in the art to provide an intermediate chamber (not shown) on the connection pipe 50, and the intermediate chamber is communicated with the end portion of the valve body 10 to which the damping structure 40 is connected where the first chamber 101 and/or the third chamber 103 is located by the connection pipe 50, and to circulate the gas in the first chamber 101 and/or the third chamber 103 by using the intermediate chamber; the connection pipe 50 is also or directly dispensed with, so that the damping part 422 can compress the gas in the damping sleeve 41 or release the compressed gas in the damping sleeve 41 when moving in the damping sleeve 41. In other embodiments consistent with the present invention, the damping structure may also be a structure in which a spring is mounted on an end cover or a piston, and the same technical effects can be achieved.
In summary, the switching valve provided by the invention utilizes the damping structure to act on the sliding block component in a moving state so as to stabilize the moving speed of the sliding block component in the valve body, thereby reducing the vibration generated when the sliding block component moves in the valve body, having the effect of reducing noise and further improving the quality of the whole product of the switching valve.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. A switching valve comprises a valve body with a valve cavity, a plurality of connecting pipes which are arranged on the valve body and communicated with the valve cavity, and a sliding block assembly; the sliding block assembly can reciprocate in the valve cavity; the switching valve is characterized by further comprising a damping structure, wherein the damping structure is arranged at the end part of the valve body and can act on the sliding block assembly in a moving state, and the damping force of the damping structure acting on the sliding block assembly is in direct proportion to the moving speed of the sliding block assembly so as to stabilize the moving speed of the sliding block assembly.
2. The switching valve of claim 1, wherein the slider assembly sequentially separates a valve cavity of the valve body into a first chamber, a second chamber, and a third chamber; the damping structure is arranged at one end of the valve body and is communicated with the first chamber or the third chamber;
or, the number of the damping structures is two, and the two damping structures are respectively positioned at two ends of the valve body and are respectively communicated with the first chamber and the third chamber.
3. The switching valve of claim 2, wherein the damping structure comprises a damping sleeve fixedly connected to the valve body, and a damping rod fixedly connected to the slider assembly; the sliding block assembly can drive the damping rod to extend into the damping sleeve, and the damping rod and the damping sleeve are matched to form a damping force which acts on the sliding block assembly reversely.
4. A switching valve according to claim 3, wherein the damping force generated by the engagement of the damping rod with the damping sleeve is proportional to the speed at which the slider assembly moves the damping rod.
5. The switching valve according to claim 4, wherein the damper rod includes a connecting rod portion fixedly connected to the slider assembly, and a damper portion provided on the connecting rod portion and engaged with the damper sleeve, the slider assembly being capable of driving the damper portion to reciprocate relative to the damper sleeve through the connecting rod portion.
6. The switching valve according to claim 5, wherein the damping portion is attached to an inner wall of the damping sleeve, and the damping portion is engaged with the damping sleeve and forms a damping gap.
7. The switching valve according to claim 5, wherein the damping portion is capable of compressing gas in the damping sleeve when the damping portion moves in the damping sleeve, and wherein a balance hole is formed in the damping portion.
8. The switching valve according to claim 5, wherein the damping portion is fitted with the damping sleeve and formed with a damping gap, and a balance hole is opened in the damping portion.
9. The switching valve according to claim 3, further comprising a connection pipe communicating with the first chamber and the third chamber.
10. A switching valve according to claim 3, wherein the pocket edge of the damping sleeve is bent in a direction toward the slider assembly and is formed as a bent portion, and the damping sleeve is fixedly connected to the valve body through the bent portion.
CN202010381030.7A 2020-05-08 2020-05-08 switching valve Active CN113623426B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010381030.7A CN113623426B (en) 2020-05-08 2020-05-08 switching valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010381030.7A CN113623426B (en) 2020-05-08 2020-05-08 switching valve

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Publication Number Publication Date
CN113623426A CN113623426A (en) 2021-11-09
CN113623426B true CN113623426B (en) 2023-12-05

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CN202010381030.7A Active CN113623426B (en) 2020-05-08 2020-05-08 switching valve

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001193850A (en) * 2000-01-12 2001-07-17 Kayaba Ind Co Ltd Spool selector valve
CN101614288A (en) * 2008-06-26 2009-12-30 浙江三花制冷集团有限公司 Valve seat and the main valve of four-way reversing valve and the four-way change-over valve that use this valve seat
CN105114663A (en) * 2015-08-20 2015-12-02 常德中联重科液压有限公司 Dynamic reversing method for reversing valve, reversing valve and reversing valve structure
CN105387014A (en) * 2015-12-07 2016-03-09 浙江华益精密机械股份有限公司 High-precision flow distributing and collecting valve
CN107061834A (en) * 2017-03-10 2017-08-18 伯特利阀门集团有限公司 Built-in driving axial flow control valve
CN208236978U (en) * 2018-05-09 2018-12-14 常州气弹簧有限公司 Damp adjustable gas spring

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001193850A (en) * 2000-01-12 2001-07-17 Kayaba Ind Co Ltd Spool selector valve
CN101614288A (en) * 2008-06-26 2009-12-30 浙江三花制冷集团有限公司 Valve seat and the main valve of four-way reversing valve and the four-way change-over valve that use this valve seat
CN105114663A (en) * 2015-08-20 2015-12-02 常德中联重科液压有限公司 Dynamic reversing method for reversing valve, reversing valve and reversing valve structure
CN105387014A (en) * 2015-12-07 2016-03-09 浙江华益精密机械股份有限公司 High-precision flow distributing and collecting valve
CN107061834A (en) * 2017-03-10 2017-08-18 伯特利阀门集团有限公司 Built-in driving axial flow control valve
CN208236978U (en) * 2018-05-09 2018-12-14 常州气弹簧有限公司 Damp adjustable gas spring

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