CN111963729B - Low flow resistance check valve - Google Patents
Low flow resistance check valve Download PDFInfo
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- CN111963729B CN111963729B CN202010949776.3A CN202010949776A CN111963729B CN 111963729 B CN111963729 B CN 111963729B CN 202010949776 A CN202010949776 A CN 202010949776A CN 111963729 B CN111963729 B CN 111963729B
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- valve
- clack
- valve clack
- cover
- support
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
- F16K15/066—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring with a plurality of valve members
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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
- 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
- F16K1/44—Details of seats or valve members of double-seat valves
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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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
- F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement
Abstract
The invention discloses a low-flow-resistance check valve, and belongs to the technical field of valve devices. The method comprises the following steps: a cavity is formed inside the valve body, and a first through hole communicated with the cavity is formed at one end of the valve body; the valve cover is connected with the other end of the valve body and is provided with a main through hole communicated with the cavity; the valve core assembly is arranged in the cavity, one end of the valve core assembly is connected with the valve cover through the first elastic part, and the valve core assembly can reciprocate along the telescopic direction of the first elastic part; wherein case subassembly includes valve clack lid, valve clack support and valve clack, and the valve clack lid is provided with the second through-hole that runs through and cavity intercommunication, and one side and the valve clack leg joint of valve clack lid, valve clack support be provided with a plurality of times through-holes of cavity intercommunication, and the valve clack sets up in the inner chamber of valve clack support, and the one end and the valve clack support of valve clack pass through the second elastomeric element and are connected, and the valve clack can be followed second elastomeric element's flexible direction reciprocating motion. The low flow resistance check valve is small in size, good in check effect and low in resistance.
Description
Technical Field
The invention relates to the technical field of valve devices, in particular to a low-flow-resistance check valve.
Background
The check valve is also called a check valve, a back pressure valve or a one-way valve, and is mainly used for preventing media from flowing backwards. The check valve belongs to an automatic valve and is automatically opened or closed in a pipeline by the thrust of medium flow. The valve clack of the opening and closing part of the check valve reciprocates along the central axis of the valve body, and the valve clack of the check valve can be provided with a spring to realize quick closing. The valve clack of the existing check valve is subjected to long-term abrasion of a medium to a sealing pair in the long-term use process, so that the problem of reduction and even damage of the pressure bearing capacity is easily caused, and the service life of the valve is shortened. The valve clack is horizontally blocked in the valve body, and fluid can only bypass the valve clack and circulate in a gap between the valve clack and the valve body, so that the flow resistance is large. In order to reduce the flow resistance, the clearance between the valve clack and the valve body must be enlarged, and under the condition that the aperture of the water flow hole is certain, the outer diameter of the valve clack is fixed and can only be realized by enlarging the inner diameter of the valve body, so that the cost is increased and the installation is also influenced. When fluid is introduced or cut off, the valve clack is opened/closed in a nonlinear way, and the instantaneous pressure difference between the front valve and the rear valve is large, so that a large water hammer effect can be generated, the safety of a pipeline is seriously threatened, and the service life of the pipeline is influenced.
Disclosure of Invention
To the above-mentioned problem that exists among the prior art, aim at providing a low flow resistance check valve, small, the non return is effectual, and the resistance is lower.
The specific technical scheme is as follows:
a low flow resistance check valve consisting essentially of: valve body, valve gap and case subassembly.
A cavity is formed inside the valve body, and a first through hole communicated with the cavity is formed at one end of the valve body;
the valve cover is connected with the other end of the valve body and is provided with a main through hole communicated with the cavity;
the valve core assembly is arranged in the cavity, one end of the valve core assembly is connected with the valve cover through the first elastic part, the valve core assembly can reciprocate along the telescopic direction of the first elastic part, and the other end of the valve core assembly can be attached to or separated from the inner side of the cavity;
wherein case subassembly includes valve clack lid, valve clack support and valve clack, the valve clack lid be provided with the second through-hole that runs through and cavity intercommunication, the one end and the valve clack leg joint of valve clack lid, the valve clack support be provided with a plurality of times through-holes of cavity intercommunication, the valve clack sets up in the inner chamber of valve clack support, the one end and the valve clack support of valve clack pass through the second elastomeric element and are connected, the valve clack can follow the flexible direction reciprocating motion of second elastomeric element, and the other end of valve clack can contact or separate with the valve clack lid.
The low flow resistance check valve further has the characteristic that the first elastic component and the second elastic component are both springs, and the rigidity of the second elastic component is larger than that of the first elastic component.
The low-flow-resistance check valve further has the characteristic that one side, deviating from the valve clack cover, of the valve clack support is provided with the first positioning shaft, the first positioning shaft penetrates through the positioning hole in the valve cover, the outer side wall of the first positioning shaft is sleeved with the first elastic part, one end of the first elastic part is in contact with the valve cover, and the other end of the first elastic part is in contact with the valve clack support.
The low-flow-resistance check valve further has the characteristic that one end, deviating from the valve clack cover, of the valve clack is provided with a second positioning shaft, the second positioning shaft penetrates through a positioning hole of the valve clack support, the outer side wall of the second positioning shaft is sleeved with a second elastic component, one end of the second elastic component is in contact with the valve clack support, and the other end of the second elastic component is in contact with the valve clack.
The low-flow-resistance check valve further has the characteristic that the valve core assembly further comprises a first sealing ring, the inner side of the first sealing ring is arranged between the valve clack cover and the valve clack support, and the outer side of the first sealing ring can form contact sealing with the valve cover.
The low-flow-resistance check valve further has the characteristic that the valve core assembly further comprises a second sealing ring, the inner side of the second sealing ring is sleeved in the annular groove of the valve clack, and the outer side of the second sealing ring can form contact sealing with the valve clack cover.
The low flow resistance check valve is characterized in that the first sealing ring and the second sealing ring are rubber gaskets.
The check valve with low flow resistance is characterized in that one side of the valve clack close to the valve clack cover is a conical surface.
The low-flow-resistance check valve is characterized in that the valve clack support comprises a top plate, a plurality of support arms and a bottom plate, the top plate is connected with the bottom plate through the support arms, and a gap is formed between every two adjacent support arms to form a secondary through hole.
The low-flow-resistance check valve is characterized in that the outer edge of the top plate is provided with a plurality of sliding buckles, and the sliding buckles are in contact with the inner wall of the cavity.
The positive effects of the technical scheme are as follows:
the invention provides a low flow resistance check valve,
1. the fluid passing through the valve not only can bypass the valve core assembly, but also can directly pass through a middle water flowing hole of the valve core assembly, so that the fluid passing through is facilitated, and meanwhile, the flow resistance can be reduced.
2. Under the condition that the flowing water aperture is not changed, the valve body can be designed to be smaller due to the reduction of the flow resistance, the material cost can be saved, and the installation is convenient.
3. When the valve is filled with fluid, the fluid pushes the valve core assembly (or simultaneously pushes the valve clack partially) to release a part of fluid pressure; after the valve core assembly reaches the extreme position, the valve clack is pushed open completely to release all fluid pressure, and the mode of releasing the fluid pressure in a grading manner is adopted, so that the instantaneous pressure difference between the front and the rear of the valve can be reduced, the water hammer effect is reduced, the risk of cracking of the pipeline is reduced, and the service life of the pipeline is prolonged.
4. When the fluid is cut off, the valve core assembly is quickly closed firstly and then the valve clack is closed under the siphon action. The fluid pressure is released in a grading reverse mode, the reverse instantaneous pressure difference is reduced, and the instantaneous water hammer effect is reduced.
Drawings
FIG. 1 is a schematic view of a low flow resistance check valve according to an embodiment of the present invention in a closed state;
FIG. 2 is a schematic diagram of a low flow resistance check valve according to an embodiment of the present invention in a semi-open state;
FIG. 3 is a schematic structural diagram of an embodiment of a low flow resistance check valve of the present invention in an open state;
FIG. 4 is a perspective cross-sectional view of an embodiment of a low flow resistance check valve of the present invention;
FIG. 5 is a front view of a cartridge assembly in an embodiment of a low flow resistance check valve of the present invention;
FIG. 6 is a perspective view of a valve core assembly in an embodiment of a low flow resistance check valve of the present invention.
In the drawings:
1. a valve cover; 2. a valve body; 3. a first elastic member; 4. a valve flap support; 41. a top plate; 411. sliding and buckling; 42. a support arm; 43. a base plate; 5. a second elastic member; 6. a valve flap; 7. a second seal ring; 8. a valve flap cover; 9. a first seal ring.
Detailed Description
In order to make the technical means, the original features, the achieved objects and the effects of the present invention easily understood, the following embodiments are specifically described with reference to fig. 1 to 6.
The numbering of the components themselves, such as "first", "second", etc., is used herein only to distinguish between the objects depicted and not to have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In this low flow resistance check valve, valve body 2 is the cavity setting, is formed with the cavity in the inside of valve body 2 promptly for install the case subassembly, and the one end of valve body 2 is provided with the first through-hole with the cavity intercommunication, and specific valve body 2's first through-hole inside wall is provided with annular bulge for contact cooperation with case subassembly and first sealing washer 9.
The valve cover 1 is connected with the other end of the valve body 2, the valve cover 1 is connected with the valve body 2 in a threaded mode, the valve cover 1 is provided with a main through hole communicated with the cavity, and when fluid enters from the first through hole of the valve body 2, the fluid flows out from the main through hole of the valve cover 1; when fluid flows in from the main through hole of the bonnet 1, the fluid is blocked in the valve body 2.
The valve core assembly is arranged in the cavity, one end of the valve core assembly is connected with the valve cover 1 through the first elastic part 3, the valve core assembly can reciprocate along the telescopic direction of the first elastic part 3, the other end of the valve core assembly can be attached to or separated from the inner side of the cavity, specifically, the valve core assembly is attached to or separated from the annular bulge, the valve core assembly moves towards the direction close to the first through hole, the valve core assembly is in close contact with the annular bulge, a good sealing effect is formed, the circulation of fluid is cut off, and the low-flow-resistance check valve is in a closed state; the valve core assembly moves towards the direction close to the valve cover, a gap is formed between the valve core assembly and the valve body 2, fluid flows out of the main through hole after entering from the first through hole, and the low-flow-resistance check valve is in a half-open state or a full-open state.
Wherein the valve core component comprises a valve flap cover 8, a valve flap bracket 4 and a valve flap 6, the valve flap cover 8 is provided with a second through hole which penetrates through and is communicated with the cavity, wherein one side of the second through hole is opposite to the first through hole, the other side of the second through hole is opposite to the main through hole, one side of the valve clack cover 8 is connected with the valve clack support 4, the valve clack support 4 is provided with a plurality of secondary through holes communicated with the cavity, the valve clack 6 is arranged in the inner cavity of the valve clack support 4, one end of the valve clack 6 is connected with the valve clack support 4 through a second elastic component 5, the valve clack 6 can reciprocate along the expansion direction of the second elastic component 5, and the other end of the valve clack 6 can contact or separate from the valve clack cover 8, the valve clack 6 moves towards the direction close to the second through hole, the valve clack 6 is tightly contacted with the valve clack cover 8 to form good sealing effect, to prevent fluid from passing through the second through-hole, the low flow resistance check valve being in a closed or semi-open state; the valve clack 6 moves towards the direction close to the valve cover 1, a gap is formed between the valve clack 6 and the valve clack cover 8, fluid flows out of the main through hole after entering from the second through hole, and the low-flow-resistance check valve is in a full-open state.
In a preferred embodiment, as shown in fig. 1, 2 and 3, the first elastic component 3 and the second elastic component 5 are both springs, and have simple structure and low cost, and are used for promoting the return of the valve core assembly and the valve flap 6, and improving the adhesion between the valve core assembly and the valve body 2, and between the valve flap 6 and the valve flap cover 8, and improving the sealing performance of the check valve. And the rigidity of the second elastic component 5 is greater than that of the first elastic component 3, so that the first opening between the valve core assembly and the valve body 2 and the second opening between the valve clack 6 and the valve clack cover 8 are realized.
In a preferred embodiment, as shown in fig. 1, fig. 2 and fig. 3, a first positioning shaft is disposed on one side of the valve flap support 4 away from the valve flap cover 8, the first positioning shaft penetrates through a positioning hole of the valve cover 1, the first elastic component 3 is sleeved on an outer side wall of the first positioning shaft, one end of the first elastic component 3 contacts with the valve cover 1, the other end of the first elastic component contacts with the valve flap support 4, the first elastic component 3 is radially limited by the first positioning shaft, when the pressure of the fluid is smaller than the elastic force of the first elastic component 3, the first elastic component 3 is restored to the original length, and the valve element assembly is pushed to the direction of the first through hole of the valve body 2.
In a preferred embodiment, as shown in fig. 1, 2 and 3, a second positioning shaft is disposed at one end of the valve flap 6 away from the valve flap cover 8, the second positioning shaft is inserted into the positioning hole of the valve flap support 4, the second elastic member 5 is sleeved on an outer side wall of the second positioning shaft, one end of the second elastic member 5 is in contact with the valve flap support 4, the other end of the second elastic member is in contact with the valve flap 6, the second elastic member 5 is radially limited by the second positioning shaft, when the pressure of the fluid is smaller than the elastic force of the second elastic member 5, the second elastic member 5 is restored to the original length, and the valve flap 6 is pushed to the direction of the first through hole of the valve body 2.
In a preferred embodiment, as shown in fig. 1, 2 and 3, the valve core assembly further comprises a first sealing ring 9, the inner side of the first sealing ring 9 is arranged between the valve clack cover 8 and the valve clack support 4, the first sealing ring 9 is fixed, and the outer side of the first sealing ring 9 can form a contact seal with the valve cover 1. When the valve core assembly is closed, the annular bulge on the inner side of the valve body 2 is tightly contacted with the first sealing ring 9 to form a sealing structure, so that the aim of preventing fluid media from passing through is fulfilled.
In a preferred embodiment, as shown in fig. 1, 2 and 3, the valve core assembly further comprises a second sealing ring 7, the inner side of the second sealing ring 7 is sleeved in the annular groove of the valve clack 6, and the outer side of the second sealing ring 7 can form a contact seal with the valve clack 6. When the valve clack 6 is closed, the valve clack cover 8 is in close contact with the second sealing ring 7 to form a sealing structure, so that the aim of preventing fluid media from passing through is fulfilled.
In a preferred embodiment, as shown in fig. 1, 2 and 3, the first and second seal rings 9 and 7 are rubber gaskets, and may be replaced by seal gaskets made of other materials.
In a preferred embodiment, as shown in fig. 1, 2 and 3, one side of the valve flap 6 close to the valve flap cover 8 is a conical surface, the valve flap 6 is matched with the inner cavity of the valve flap support 4 and extends into the second through hole of the valve flap cover 8, so that the valve flap 6 and the valve flap cover 8 are tightly attached, and the sealing performance of the low-flow-resistance check valve after the valve flap 6 is seated is improved.
In a preferred embodiment, as shown in fig. 5 and 6, the valve flap support 4 includes a top plate 41, a plurality of support arms 42, and a bottom plate 43, the top plate 41 is connected to the bottom plate 43 through the plurality of support arms 42, specifically, three support arms 42 are provided, the support arms 42 are uniformly arranged in an annular array, and the bottom plate 43 is arranged in a "Y" shape, although the bottom plate 43 may also be arranged in a "cross" shape, the corresponding support arms 42 need to be arranged in four, and a gap is provided between two adjacent support arms 42 to form a secondary through hole, from which fluid can flow into the cavity.
In a preferred embodiment, as shown in fig. 5 and 6, a plurality of sliders 411 are disposed on an outer edge of the top plate 41, the top plate 41 is generally disposed in a circular ring shape, the sliders 411 are uniformly distributed on an edge of the top plate 41 in an annular array, the sliders 411 are in contact with an inner wall of the cavity, other positions of the edge of the top plate 41 are not in contact with the inner wall of the cavity, only the sliders 411 are in contact with the inner wall of the cavity, the sliders 411 serve as a limit, and prevent the valve plate support 4 from moving in a radial direction, and meanwhile, since a contact area between the sliders 411 and the inner wall of the cavity is small, a friction force applied during a sliding process is small, and meanwhile, smoothness of the valve flap support 4 during the sliding process is improved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The working principle of the low flow resistance check valve is as follows: when the low flow resistance check valve is connected with a fluid channel, fluid pressure firstly pushes the valve core assembly to move in the same direction as the fluid movement direction, the first elastic part is compressed towards the fluid movement direction, the sealing state between the valve core assembly and the valve cover is released, and fluid firstly and secondly flows to the main through hole of the valve cover through the first through hole of the valve body and a gap between the valve core assembly and the valve cover to release part of pressure. When the elasticity of the first elastic component reaches a limit value, the valve core component does not move any more, the fluid can further push the valve clack to move in the same direction as the fluid movement direction, the second elastic component is compressed to push the valve clack, the sealing state between the valve clack and the valve clack cover is relieved, and the fluid can also flow to the secondary through hole from the second through hole of the valve clack cover, so that the flow area of a medium is increased, the water hammer effect generated due to overlarge fluid pressure difference is reduced, the abrasion of the valve caused by overlarge impact force is avoided, the mute check function can be realized, the valve sealing performance is ensured, and the service life of the valve is prolonged.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. A low flow resistance check valve, comprising:
the valve comprises a valve body, a valve body and a valve body, wherein a cavity is formed inside the valve body, and one end of the valve body is provided with a first through hole communicated with the cavity;
the valve cover is connected with the other end of the valve body and is provided with a main through hole communicated with the cavity;
the valve core assembly is arranged in the cavity, one end of the valve core assembly is connected with the valve cover through a first elastic part, the valve core assembly can reciprocate along the telescopic direction of the first elastic part, and the other end of the valve core assembly can be attached to or separated from the inner side of the cavity;
the valve core assembly comprises a valve clack cover, a valve clack support and a valve clack, wherein the valve clack cover is provided with a second through hole which penetrates through the valve clack cover and is communicated with the cavity, one end of the valve clack cover is connected with the valve clack support, the valve clack support is provided with a plurality of through holes which are communicated with the cavity, the valve clack is arranged in an inner cavity of the valve clack support, one end of the valve clack is connected with the valve clack support through a second elastic component, the valve clack can move in a reciprocating mode along the stretching direction of the second elastic component, and the other end of the valve clack can be in contact with or separated from the valve clack cover;
a first positioning shaft is arranged on one side, away from the valve clack cover, of the valve clack support, the first positioning shaft penetrates through a positioning hole of the valve cover, the first elastic component is sleeved on the outer side wall of the first positioning shaft, one end of the first elastic component is in contact with the valve cover, and the other end of the first elastic component is in contact with the valve clack support;
the valve clack deviates from the one end of valve clack lid is provided with the second location axle, the second location axle is worn to locate in the locating hole of valve clack support, the second elastomeric element cover is located the lateral wall of second location axle, just the one end of second elastomeric element with valve clack support contact, the other end with the valve clack contact.
2. A low flow resistance check valve as claimed in claim 1 wherein said first resilient member and said second resilient member are both springs and said second resilient member has a stiffness greater than a stiffness of said first resilient member.
3. The low flow resistance check valve of claim 1, wherein the spool assembly further comprises a first seal ring, an inner side of the first seal ring is disposed between the valve flap cover and the valve flap support, and an outer side of the first seal ring is capable of forming a contact seal with the valve cover.
4. The low flow resistance check valve of claim 3, wherein the spool assembly further comprises a second sealing ring, an inner side of the second sealing ring is sleeved in the annular groove of the valve flap, and an outer side of the second sealing ring can form a contact seal with the valve flap cover.
5. The low flow resistance check valve of claim 4 wherein said first and second seals are rubber gaskets.
6. The low flow resistance check valve of claim 1 wherein the side of the flap adjacent the flap cover is conically tapered.
7. The low flow resistance check valve of claim 1, wherein the valve flap support comprises a top plate, a plurality of support arms, and a bottom plate, the top plate and the bottom plate are connected by the plurality of support arms, and a gap is formed between two adjacent support arms to form the secondary through hole.
8. The low flow resistance check valve of claim 7 wherein the top plate has a plurality of slides on its outer edges, the slides contacting the inner wall of the chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010949776.3A CN111963729B (en) | 2020-09-10 | 2020-09-10 | Low flow resistance check valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010949776.3A CN111963729B (en) | 2020-09-10 | 2020-09-10 | Low flow resistance check valve |
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| CN111963729A CN111963729A (en) | 2020-11-20 |
| CN111963729B true CN111963729B (en) | 2022-04-08 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112943940B (en) * | 2021-02-24 | 2023-01-20 | 上海捷氢科技股份有限公司 | Air back pressure valve and fuel cell system |
| CN114087519B (en) * | 2021-11-05 | 2023-01-03 | 新乡航空工业(集团)有限公司 | Multifunctional valve assembly for pump |
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| KR101435782B1 (en) * | 2013-09-23 | 2014-08-29 | 주식회사 현대케피코 | Both direction check valve |
| CN206904301U (en) * | 2017-04-09 | 2018-01-19 | 上海梅山钢铁股份有限公司 | Side valve type high-pressure check valve |
| CN110081211A (en) * | 2019-04-28 | 2019-08-02 | 贵州曼格维流体智能科技有限公司 | A kind of check valve for Satellite attitude and orbit control propellant-feed system |
| CN214500157U (en) * | 2021-03-04 | 2021-10-26 | 南京万杰机电成套设备有限公司 | Oil way check valve for compressor |
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| CN111963729A (en) | 2020-11-20 |
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