KR101628052B1 - Module type solenoid valve unit - Google Patents

Module type solenoid valve unit Download PDF

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Publication number
KR101628052B1
KR101628052B1 KR1020150147184A KR20150147184A KR101628052B1 KR 101628052 B1 KR101628052 B1 KR 101628052B1 KR 1020150147184 A KR1020150147184 A KR 1020150147184A KR 20150147184 A KR20150147184 A KR 20150147184A KR 101628052 B1 KR101628052 B1 KR 101628052B1
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KR
South Korea
Prior art keywords
bobbin
plunger
valve
groove
solenoid
Prior art date
Application number
KR1020150147184A
Other languages
Korean (ko)
Inventor
김현기
지석조
임창식
Original Assignee
코리아에프티 주식회사
에스디(주)
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Priority to KR1020150147184A priority Critical patent/KR101628052B1/en
Application granted granted Critical
Publication of KR101628052B1 publication Critical patent/KR101628052B1/en

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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
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0655—Lift valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modular solenoid valve unit, and more particularly, to a novel concept that improves the durability and operability of a solenoid valve and maximizes utilization.
Conventionally, the solenoid valve disclosed in the related art has lowered responsiveness in response to operation and contaminants (water, salt, dust, etc.) are introduced into the bobbin when air is introduced from the atmospheric side, It is not possible to modularize only the valve, resulting in a problem that the entire structure is complicated and bulky.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a valve seat which can always keep airtightness of the bobbin and prevent contaminants from entering when the air is introduced from the atmospheric side, This is characterized by the ability to improve the stability of operation and the utilization of valves through the modularization of solenoid valves with built-in return springs.

Description

[0001] The present invention relates to a module type solenoid valve unit,

The present invention relates to a novel concept of improving the durability and operability of a solenoid valve and maximizing utilization.

Generally, a solenoid is used in a variety of applications in the automotive industry, for example, an automatic or remote valve, such as a canister vent associated with an evaporative gas control system, as well as a high output switch with a low power control signal .

These solenoid valves can be used to control the flow of various fluids or gases. For example, with respect to the canister vent solenoid, the solenoid valve may be used to control the air flow entering the activated carbon canister from the atmosphere.

And the solenoid valve may be used to control liquid and gas flow in other vehicle systems.

During operation of the solenoid valve, the solenoidal armature moves a seal on the plunger to close or separate it against the valve seat, and when the seal is in close contact with the valve seat, the solenoid valve is placed in the closed position, The solenoid valve is placed in the open position.

Such opening and closing of the solenoid valve can generate various audible noises, and audible noise associated with various mechanical parts of an automobile is undesirable.

As a prior art for solving the problems contained in such solenoid valves, "Patent Registration No. 1300364, name / solenoid with reduced operating noise" is published.

The prior art discloses a valve seat in which a plunger damper installed at the bottom of the core strikes the valve seat during closing of the valve, an armature which strikes the upper bobbin portion or stop during valve opening, a collision between the plunger and armature during valve opening or closing, Thereby providing an effect of reducing audible noise associated with more than one.

In this prior art, when the plunger is operated up and down, friction occurs with the inner circumferential surface of the plunger damper, and a sliding load is generated, thereby decreasing responsiveness in response to the valve operation. To prevent this, a gap is formed between the plunger damper and the plunger (Moisture, salt, dust, etc.) may be introduced into the bobbin through the gap when air is introduced from the atmospheric side, resulting in a problem of deterioration in service life and performance.

Also, in the prior art, since the return spring is disposed inside the valve body, the solenoid valve alone can not be modularized independently of the valve body, so that the overall structure is complicated and bulky, and the solenoid valve is varied in various ways It is difficult to change to the product of the specification, and the utilization of the product is deteriorated.

The present invention provides a technique for preventing the inflow of contaminants while maintaining airtightness of the bobbin at all times when the air is introduced from the atmospheric side in a state where the valve is open .

In addition, the present invention seeks to improve the stability of operation and the utilization of valves through modularization of a solenoid valve having a return spring built in the bobbin.

The present invention also contemplates a technique for eliminating defective contact between the valve seat and the lower end of the bobbin while the elastic groove formed in the sealing portion of the valve seal exerts an elastic force.

According to the present invention, since the open portion of the bobbin is always kept airtight by the valve seal when the valve is opened, the inflow of contaminants to the inside of the bobbin is prevented originally when air is introduced from the atmospheric side, It is possible to prevent deterioration and improve the durability remarkably.

In addition, the present invention provides a modular solenoid valve having a return spring built in the bobbin, thereby ensuring the original operation and stability of operation, and also preventing the components (valve bodies, canisters, etc.) mounted on the lower end of the modular solenoid valves The solenoid valve can be changed into a product with various mounting features by only changing the valve, thereby maximizing the utilization of the valve.

In addition, since the elastic groove is formed in the sealing part of the valve seal, the sealing part can exert an elastic force to compensate for the contact failure occurring when the sealing part contacts the valve seat or the lower end of the bobbin, It provides an effect to reduce.

1 is a front elevational view of an embodiment of a modular solenoid valve unit to which the present invention is applied.
Figure 2 is a front section view of the modular solenoid valve of the present invention in an open state
Fig. 3 is a front sectional view of the modular solenoid valve of the present invention in a closed state
4 is a front section view of the modular solenoid valve of the present invention
5 is a sectional front view of the modular solenoid valve of the present invention
6 is an enlarged cross-sectional view of the bobbin, solenoid core, plunger rod, and valve seal of the present invention,
7 is a sectional view of another embodiment of a modular solenoid valve unit to which the present invention is applied.

Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

A solenoid core 120, a plunger 130, a plunger rod 140, and a plunger rod 140. The modular solenoid valve 100 according to the preferred embodiment of the present invention includes a bobbin 110, a solenoid core 120, It can be confirmed that the valve seal 150 is substantially divided into constituent elements.

Hereinafter, the present invention having the above-described schematic configuration will be described in more detail for facilitating the implementation.

The modular solenoid valve 100 is excluded from the condition that the inside of the bobbin 110 is contaminated by opening the bobbin 110 only when the valve is closed.

The bobbin 110 supports the solenoid core 120 so that the lower portion of the bobbin 110 can be inserted into the bobbin 110 and a solenoid core 120 is disposed below the bobbin 110 And a plunger 130 is inserted in the upper side of the bobbin 110 to be movable up and down.

A plurality of coupling protrusions 121 are formed on the lower side of the outer circumferential surface of the solenoid core 120 so as to maintain solid integrity without being separated from the bobbin 110. The coupling protrusions 121 Are coupled to the plurality of coupling grooves 111 formed in the inner circumferential surface of the bobbin 110 so that the solenoid core 120 and the bobbin 110 maintain the mutually integrated coupling force.

A plunger guide groove 122 is formed in the upper portion of the solenoid core 120 to guide a vertical movement of the plunger 130. A plunger guide groove 122 is formed in the plunger 130, The protrusion 131 is further inserted in a vertically movable manner so that the plunger 130 can be moved upward and downward.

The upper end of the plunger rod 140 is integrally coupled to the plunger 130 and the lower end of the plunger rod 140 is exposed to the outside of the bobbin 110 through the center of the solenoid core 120, And a valve seal 150 is installed on the outer side of the disc 142 to improve the airtightness and the valve seal 150 is provided with a valve When air is introduced from the air side in the opened state, the air is adhered to the lower end of the bobbin 110, thereby preventing foreign matter from flowing into the bobbin 110.

The plunger rod 140 is made of steel as a base material and is press-fitted into the press-fit groove 132 formed at the center of the plunger 130 so that the plunger rod 140 is firmly integrated with the plunger rod 140 Is coupled through a bearing bush 125 which is further inserted into the center of the solenoid core 120. [

Therefore, the bearing bush 125 guides the plunger rod 140 in an accurate vertical movement, so that the plunger rod 140 maintains an accurate straightness, and even if a minute dimensional change occurs in the inner diameter of the bobbin 110, Thereby improving the durability and stabilizing the operability of the valve seal 150, thereby improving the intermittent leakage failure.

The plunger rod 140 is formed with an insert groove 141 formed in an outer circumferential surface of a portion to which the disc 142 is coupled and the disc 142 is integrally inserted into the insert groove 141 through insert molding, The airtightness of the valve seal 150 is greatly improved, thereby providing a special effect of improving the leakage defects.

In the meantime, the modular solenoid valve 100 of the present invention has a solenoid valve 100 in which the valve is automatically closed when the plunger 130 is opened due to the weight of the plunger 130 when electricity is shut off, A return spring 160 is provided between the solenoid core 120 and the plunger 130 so as to move the plunger 130 moved downward when the electricity is energized.

4, a spring support groove 134 is formed at the lower center of the plunger 130. A return spring 160 is inserted into the spring support groove 134 and the plunger guide groove 122, So that the plunger 130 can be returned quickly.

The valve body 200 having the valve seat 204 formed therein is not installed with the return spring 160 but is installed inside the bobbin 110 separated from the valve body 200, And a separate modular solenoid valve 100 separated from the first solenoid valve 100 can be realized to secure the original operation and stability of the operation.

In addition, the valve seals 150 of the present invention selectively seal the upper and lower surfaces of the bobbin 110 and the upper end of the valve seat 204, respectively, while sealing the hermetic seal, And an elastic groove 152 is further formed in the inner peripheral surface of the sealing portion 151. [

The sealing portion 151 is elastically deformed by the elastic groove 152 without using a separate part such as a buffer pad when it is brought into close contact with the lower end of the bobbin 110 or the upper end of the valve seat 204, Shock reduction and operation noise are remarkably reduced, and when the valve seal 150 is operated by the dimensional deviation, even if the rectangularity is bad, it is compensated to provide a special effect of preventing the leakage failure.

1 through 3, the valve body 200 having the valve seat 204 formed therein is integrally mounted on the lower side of the modular solenoid valve 100 according to the present invention to form the modular solenoid valve unit U1 ).

The valve body 200 has a bobbin insertion portion 201 protruded from its upper portion and an air inlet 202 and an air outlet 203 communicating with the bobbin insertion portion 201 are formed on both sides of the valve body 200, A valve seat 204 to which the valve seal 150 is closely attached is protruded upward at an inner front end of the air inlet 202 so as to communicate with the air inlet 202 and the air outlet 203.

The support plate 113 protruding from the outer circumferential surface of the bobbin 110 while the lower side of the bobbin 110 is inserted into the bobbin inserting unit 201 may be fixed to the upper end of the bobbin inserting unit 201, The bobbin 110 and the disk 142 are positioned on the same line as the valve seat 204 in the vertical direction.

Accordingly, when the valve seat 204 is opened and the valve is opened, as shown in FIG. 1, when the air is introduced through the air inlet 202 from the atmospheric side, the valve seal 150, which is moved upward, The open portion 112 of the bobbin 110 is closed while keeping the airtightness to prevent the contaminants from entering the bobbin 110 to prevent the corrosion and the life of the valve, Thereby providing an effect of improving the performance.

3, the valve seat 150 moved downward is brought into close contact with the upper end of the valve seat 204, so that even when the bobbin 110 is opened, Thereby preventing the inflow of pollutants.

The bobbin 110 is integrally formed with an outer cover 250 having an open bottom at an upper outer circumferential surface thereof and a coupling groove 251 is formed at a lower inner circumferential surface of the outer cover 250. The bobbin insertion portion The coupling protrusions 206 and the support plate 113 protrude from the outer circumferential surface of the coupling protrusion 206 and the support plate 113 are fitted into the coupling groove 251. The coupling protrusions 206 and the support plate 113 are formed in ring- The modular solenoid valve 100 and the valve body 200 maintain a firm integrity with each other and prevent leakage of the external air introduced into the valve body 200 by installing the O- .

In the meantime, the present invention is not limited to the structure in which the valve body 200 can be mounted to the lower end of the modular solenoid valve 100, and the cost can be reduced by mounting the valve body 200 directly on the canister 300, It is possible to implement the modular solenoid valve unit U2.

7, the canister 300 is directly mounted on the lower end of the modular solenoid valve 100. [

The canister 300 has a support plate 113 protruding from the outer circumferential surface of the bobbin 110 at the upper end of the bobbin insertion portion 301 formed at the upper portion thereof and a valve seat 150 The valve seals 150 and the valve seats 204 of the modular solenoid valve 100 are positioned on the same line in mutually up and down directions.

A coupling flange 351 formed at the lower end of the outer cover 350 is connected to the upper end of the upper portion of the canister 300, So that it can be integrally coupled through the fastener 352 in a state of being in tight contact with the coupling protrusion 303 protruding from the coupling protrusion.

The modular solenoid valve 100 of the present invention can be replaced with a valve body 200 or a canister 300 by simply replacing the components mounted on the lower end of the modular solenoid valve 100 with the valve body 200 or the canister 300. [ To provide a special effect that maximizes the utilization of the valve.

U1, U2: Modular solenoid valve unit 100: Modular solenoid valve
110: bobbin 111: binding groove
113: support plate 120: solenoid core
121: Coupling protrusion 125: Bearing bush
130: plunger 131: guide projection
132: press fit groove 134: spring support groove
140: plunger rod 141: insert groove
142: Disk 150: Valve seal
151: sealing part 152: elastic groove
160: return spring 200: valve body
201, 301: bobbin inserting portion 202: air inlet
203: air outlet 204, 304: valve seat
206: engaging projection 250, 350: outer cover
251: coupling groove 300: canister
303: engaging projection 351: engaging flange

Claims (10)

A solenoid core 120 inserted into a lower portion of the bobbin 110 having an open bottom;
A plunger 130 vertically movably inserted on the bobbin 110;
A plunger rod 140 having an upper side integrally coupled to the plunger 130 and a lower side extending through the center of the solenoid core 120 and exposed to the outside of the bobbin 110;
The valve seat 204 is opened and the bobbin 110 is opened when the air is introduced from the atmospheric side while the valve is opened, And a valve seal 150 for closing the open portion 112 of the bobbin 110 and preventing foreign matter from entering the bobbin 110 by being in contact with the lower end of the bobbin 110;
A plunger guide groove 122 is formed in the upper portion of the solenoid core 120 and a guide protrusion 131 protruding from the lower end of the plunger 130 is inserted into the plunger guide groove 122 to be movable up and down;
A spring support groove 134 is formed at a lower center of the plunger 130 and both upper and lower sides of the return spring 160 are fitted in the spring support groove 134 and the plunger guide groove 122.
The upper portion of the plunger rod 140 is integrally press-fitted into a press-fit groove 132 formed at the center of the plunger 130. The center portion of the plunger rod 140 passes through a bearing bush 125 inserted in the center of the solenoid core 120 And the bearing bushes 125 guide the vertical movement of the plunger rod 140;
A plurality of coupling protrusions 121 are vertically spaced apart from the outer circumferential surface of the solenoid core 120. The coupling protrusions 121 are engaged with coupling grooves 111 formed on the inner circumferential surface of the bobbin 110,
The valve seals 150 protrude from the upper and lower surfaces of the bobbin 110 and the valve seat 204, respectively. The sealing portions 151 are formed on the inner peripheral surface of the sealing portion 151 A modular solenoid valve (100) having a configuration in which the elastic groove (152) is recessed;
A support plate 113 protruding from the outer circumferential surface of the bobbin 110 is seated on the upper end of the bobbin insertion portion 201 formed on the upper portion of the modular solenoid valve 100, And a valve body 200 formed to communicate with the air inlet 202 and the air outlet 203 formed on both sides of the valve seat 204 in close contact with each other.
The outer cover 250 is integrally fitted to the outer circumferential surface of the upper portion of the bobbin 110 and the coupling groove 251 formed in the lower inner circumferential surface of the outer cover 250 integrally supports the bobbin insertion portion 201 An engaging projection 206 protruding from the outer circumferential surface and a supporting plate 113 are fitted and engaged with each other and the engaging protrusion 206 and the supporting plate 113 are fitted into a ring groove 207, Wherein the solenoid valve unit is mounted on a vehicle.
delete delete delete delete delete delete delete A solenoid core 120 inserted into a lower portion of the bobbin 110 having an open bottom;
A plunger 130 vertically movably inserted on the bobbin 110;
A plunger rod 140 having an upper side integrally coupled to the plunger 130 and a lower side extending through the center of the solenoid core 120 and exposed to the outside of the bobbin 110;
The valve seat 304 is opened and the bobbin 110 is opened when the air is introduced from the atmospheric side while the valve is opened, And a valve seal 150 for closing the open portion 112 of the bobbin 110 and preventing foreign matter from entering the bobbin 110 by being in contact with the lower end of the bobbin 110;
A plunger guide groove 122 is formed in the upper portion of the solenoid core 120 and a guide protrusion 131 protruding from the lower end of the plunger 130 is inserted into the plunger guide groove 122 to be movable up and down;
A spring support groove 134 is formed at a lower center of the plunger 130 and both upper and lower sides of the return spring 160 are fitted in the spring support groove 134 and the plunger guide groove 122.
The upper portion of the plunger rod 140 is integrally press-fitted into a press-fit groove 132 formed at the center of the plunger 130. The center portion of the plunger rod 140 passes through a bearing bush 125 inserted in the center of the solenoid core 120 And the bearing bushes 125 guide the vertical movement of the plunger rod 140;
A plurality of coupling protrusions 121 are vertically spaced apart from the outer circumferential surface of the solenoid core 120. The coupling protrusions 121 are engaged with coupling grooves 111 formed on the inner circumferential surface of the bobbin 110,
The valve seals 150 protrude from the upper and lower surfaces of the bobbin 110 and the valve seat 204, respectively. The sealing portions 151 are formed on the inner peripheral surface of the sealing portion 151 A modular solenoid valve (100) having a configuration in which the elastic groove (152) is recessed;
A support plate 113 protruding from the outer circumferential surface of the bobbin 110 is seated on the upper end of the bobbin insertion portion 301 formed on the upper portion of the modular solenoid valve 100, And a canister (300) having a valve seat (304) to which the valve seat (150) is closely attached;
An outer cover 350 having an open bottom is integrally fitted to an upper outer circumferential surface of the bobbin 110 and a coupling flange 351 formed at a lower end of the outer cover 350 protrudes from an upper end of the canister 300 And is integrally coupled to the coupling protrusion (303) formed. delete
KR1020150147184A 2015-10-22 2015-10-22 Module type solenoid valve unit KR101628052B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150147184A KR101628052B1 (en) 2015-10-22 2015-10-22 Module type solenoid valve unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150147184A KR101628052B1 (en) 2015-10-22 2015-10-22 Module type solenoid valve unit

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KR101628052B1 true KR101628052B1 (en) 2016-06-09

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180032268A (en) * 2016-09-22 2018-03-30 (주) 솔텍 Noise Reduction Type Canister Close Solenoid Valve
US20210330090A1 (en) * 2016-10-28 2021-10-28 Anthony John Shakal Noise Reducing Plunger
KR20230126552A (en) * 2022-02-23 2023-08-30 동아대학교 산학협력단 Cryogenic Needle Valve
CN118049499A (en) * 2024-04-16 2024-05-17 气味王国(山东)科技有限公司 Mute bistable electromagnetic double-cylinder valve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003532853A (en) * 2000-05-12 2003-11-05 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング valve
JP2004028194A (en) * 2002-06-25 2004-01-29 Mikuni Corp Solenoid valve
JP2010025135A (en) * 2008-07-15 2010-02-04 Mitsubishi Electric Corp Solenoid valve
JP2014202318A (en) * 2013-04-08 2014-10-27 株式会社デンソー Faucet device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003532853A (en) * 2000-05-12 2003-11-05 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング valve
JP2004028194A (en) * 2002-06-25 2004-01-29 Mikuni Corp Solenoid valve
JP2010025135A (en) * 2008-07-15 2010-02-04 Mitsubishi Electric Corp Solenoid valve
JP2014202318A (en) * 2013-04-08 2014-10-27 株式会社デンソー Faucet device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180032268A (en) * 2016-09-22 2018-03-30 (주) 솔텍 Noise Reduction Type Canister Close Solenoid Valve
KR101888485B1 (en) * 2016-09-22 2018-08-14 (주)솔텍 Noise Reduction Type Canister Close Solenoid Valve
US20210330090A1 (en) * 2016-10-28 2021-10-28 Anthony John Shakal Noise Reducing Plunger
US11950702B2 (en) * 2016-10-28 2024-04-09 Sleep Number Corporation Noise reducing plunger
KR20230126552A (en) * 2022-02-23 2023-08-30 동아대학교 산학협력단 Cryogenic Needle Valve
KR102586841B1 (en) 2022-02-23 2023-10-11 동아대학교 산학협력단 Cryogenic Needle Valve
CN118049499A (en) * 2024-04-16 2024-05-17 气味王国(山东)科技有限公司 Mute bistable electromagnetic double-cylinder valve

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