CN203670326U - Overflow valve with oil supplementation function - Google Patents
Overflow valve with oil supplementation function Download PDFInfo
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- CN203670326U CN203670326U CN201320837394.7U CN201320837394U CN203670326U CN 203670326 U CN203670326 U CN 203670326U CN 201320837394 U CN201320837394 U CN 201320837394U CN 203670326 U CN203670326 U CN 203670326U
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Abstract
The utility model discloses an overflow valve with an oil supplementation function. The overflow valve comprises an overflow valve body, a valve sleeve, a main valve element and an oil supplementation valve. The valve sleeve and the oil supplementation valve are adjacently arranged in an inner cavity of the overflow valve body, an oil inlet cavity and an oil return cavity are further formed in the inner cavity of the overflow valve body, one end of the valve sleeve is arranged in the oil return cavity, the side wall of the valve sleeve is provided with a first opening communicated with the oil return cavity, the main valve element is arranged in the valve sleeve, and the end of the main valve element abuts against the first opening. The oil supplementation valve comprises a hollow oil supplementation body, and the hollow oil supplementation body is in butt joint with the end of the valve sleeve to block the oil inlet cavity and the oil return cavity. Compared with the prior art, because of the oil supplementation mode, the overflow valve is low in oil supplementation pressure, high in oil supplementation efficiency, and high in reliability.
Description
Technical field
The utility model relates to the relief valve in hydraulic system, is specifically related to a kind of relief valve with repairing function.
Background technique
Relief valve is the safety valve of pilot pressure in hydraulic system.In the time that system is normally worked, relief valve, in closed condition, is opened relief function in the time that system pressure is greater than its setting pressure, and system is played to overload protective function.But a lot of executive components, as motor, oil cylinder etc., if motion speed is too fast, thereby there will be the empty air pocket that forms of suction to cause dynamic performance to degenerate, and reduce the hydraulic element life-span.Therefore, it is necessary that repairing function is set in hydraulic system, and existing most relief valve is also all integrated with repairing function.
Refer to Fig. 1, Fig. 1 is an embodiment's of existing relief valve cross-sectional view.As shown in Figure 1, this relief valve comprises overflow valve body 101, valve pocket 102, main valve plug 103, the first swivel nut 104, the first spring 105 and cone valve assembly 106.Overflow valve body 101 inner hollow form inner chamber, further form oil suction chamber Q and oil back chamber T and be communicated with inner chamber respectively on overflow valve body 101.Valve pocket 102 is arranged in the inner chamber of overflow valve body 101, on the sidewall of valve pocket 102, be provided with the first opening M that is communicated with oil back chamber T, main valve plug 103 is arranged in valve pocket 102, and the end of main valve plug 103 supports on the first opening M to intercept oil back chamber T and oil suction chamber Q.One end of the first swivel nut 104 and overflow valve body 101 are spirally connected and in abutting connection with valve pocket 102, cone valve assembly 106 is screw-coupled to the other end of the first swivel nut 104 and forms and unload oil pocket U with it.Valve pocket 102, the first swivel nut 104 and main valve plug 103 form main valve plug oil pocket P together.The first spring 105 is arranged in main valve plug oil pocket P, and its one end supports on the first swivel nut 104, and the other end supports on main valve plug 103.One end of main valve plug oil pocket P forms the first damping hole K1 and is communicated with oil suction chamber Q on main valve plug 103, and the other end of main valve plug oil pocket P forms the second damping hole K2 and flows into and unload in oil pocket U with the oil of main valve plug oil pocket P in the time that the spool 1061 of cone valve assembly 106 is removed on the first swivel nut 104.
When cause the oil pressure (pressure of oil of oil suction chamber Q due to running up of executive component, hereinafter to be referred as oil pressure) while sharply declining, the repairing working principle of relief valve is as follows: because the oil pressure of main valve plug oil pocket P is higher than the oil pressure of oil suction chamber Q, the oil of main valve plug oil pocket P flows into oil suction chamber Q by the first damping hole K1, and the oil in main valve plug oil pocket P is constantly reduced.To main valve plug 103 Overall Analysis, it is subject to oil back chamber T, oil pressure in oil suction chamber Q and main valve plug oil pocket P, because the oil pressure in main valve plug oil pocket P is approximately equal to the oil pressure of oil suction chamber Q, now act on oil pressure on main valve plug 103 end faces and be oil back chamber T that force direction is contrary and the oil pressure of main valve plug oil pocket P, the difference that acts on the oily pressure of the oil back chamber T on main valve plug 103 end faces and the oily pressure of main valve plug oil pocket P is denoted as to F, in the time that F is greater than the elastic force of the first spring 105, main valve plug 103 is to moving away from the direction of oil suction chamber Q, conducting between oil back chamber T and oil suction chamber Q, the oil of oil back chamber T flows in oil suction chamber Q and plays repairing effect.Wherein,
(
poor for the oil pressure of oil back chamber T and the oil pressure of main valve plug oil pocket P, Δ S
2-1poor for the cross-section area of main valve plug 103 and the cross-section area of oil suction chamber Q).
When above-mentioned relief valve is realized repairing, because of the difference in areas Δ S of the cross-section area of main valve plug 103 and the cross-section area of oil suction chamber Q
2-1less, when
when larger, the resistance that pressure difference F just can overcome the first spring 105 moves main valve plug 103, and the oil pressure of oil back chamber T could be realized repairing far above the oil pressure of main valve plug oil pocket P, and so probably repairing not in time; In addition, because this repairing process is to complete under the prerequisite moving at promotion main valve plug 103, and the oil of main valve plug 103 main valve plug oil pocket P before movement need flow in oil suction chamber Q through the first damping hole K1, the less oil that makes main valve plug oil pocket P in aperture of the first damping hole K1 flows out slower, make the movement of main valve plug also slower, therefore repairing amount is subject to certain limitation, and cannot realize repairing in the time that the first damping hole K1 stops up.
Model utility content
Technical problem to be solved in the utility model is to provide a kind of relief valve with repairing function, overcomes the relief valve repairing of prior art not in time, and repairing amount is restricted and because the obstruction of damping hole possibly cannot realize the technical problem of repairing.
The utility model provides a kind of relief valve with repairing function, this relief valve comprises overflow valve body, valve pocket, main valve plug and Fill valve, in the adjacent inner chamber that is arranged at overflow valve body of valve pocket and Fill valve, in the inner chamber of overflow valve body, further form oil suction chamber and oil back chamber, one end of valve pocket is arranged in oil back chamber, and the first opening that is communicated with oil back chamber is set on the sidewall of valve pocket, and main valve plug is arranged in valve pocket, and the end of main valve plug supports on the first opening; Fill valve comprises the repairing valve body of hollow, and end, one end butt of repairing valve body and valve pocket is to intercept oil suction chamber and oil back chamber; Main valve plug in the time that relief valve is realized relief function to moving away from the direction of Fill valve so that the oil of oil suction chamber flow in oil back chamber by repairing valve body and the first opening; The external diameter of repairing valve body is greater than the diameter of oil suction chamber, repairing valve body in the time that relief valve is realized repairing function to moving away from the direction of main valve plug so that the oil of oil back chamber by the opening that forms between valve pocket and repairing valve body and flow in oil suction chamber by Fill valve.
Wherein, one end towards main valve plug of repairing valve body has conical outer surface, end, one end butt of conical outer surface and valve pocket.
Wherein, repairing valve body further comprises the anchor ring radially arranging along it, and anchor ring connects conical outer surface; A part for anchor ring and conical outer surface is communicated with oil back chamber.
Wherein, repairing valve body has the internal surface of the taper arranging towards main valve plug.
Wherein, on the outer surface coordinating of repairing valve body, be arranged with annular groove with inner chamber, Fill valve further comprises seal ring, and seal ring is arranged in annular groove.
Wherein, Fill valve further comprises repairing spring, and one end of repairing spring and repairing valve body support, and the other end supports the end wall of oil suction chamber.
Wherein, relief valve further comprises the first swivel nut and cone valve assembly, and one end of the first swivel nut and valve body are spirally connected and in abutting connection with valve pocket; The first swivel nut, valve pocket and main valve plug form main valve plug oil pocket together; Cone valve assembly is screw-coupled to the other end of the first swivel nut and forms and unload oil pocket with it; One end of main valve plug oil pocket forms the first damping hole being communicated with oil suction chamber on main valve plug, and the other end of main valve plug oil pocket forms the second damping hole and flows into and unload in oil pocket with the oil of main valve plug oil pocket in the time that the spool of cone valve assembly is opened on the first swivel nut.
Wherein, relief valve further comprises the first spring, and the first spring is arranged in main valve plug oil pocket, and its one end supports the first swivel nut, and the other end supports main valve plug.
Wherein, cone valve assembly further comprises the second swivel nut, screw press, pressure regulation nut, the second spring and locknut; The second swivel nut is screw-coupled to the other end of the first swivel nut and forms and unload oil pocket with it, spool, the second spring and screw press der group are loaded in the second swivel nut, spool is separated the second damping hole and is unloaded oil pocket, and locknut and pressure regulation nut are sequentially screwed onto outside the second swivel nut, and pressure regulation nut butt screw press.
The beneficial effects of the utility model are: compared with prior art, the utility model arranges Fill valve to strengthen repairing performance between oil back chamber and oil suction chamber, pressure difference between oil back chamber and oil suction chamber hour gets final product repairing, oil compensation pressure is low, only solve and carried out repairing by main valve plug, and the slow technical problem of main valve plug repairing, repairing efficiency is high, and avoided the first damping hole to block causing cannot repairing situation, reliability is strong.
Accompanying drawing explanation
In order to be illustrated more clearly in the technological scheme in the utility model embodiment, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing, wherein:
Fig. 1 is the cross-sectional view of existing relief valve;
Fig. 2 is the cross-sectional view of a preferred embodiment of the relief valve of the utility model band repairing function.
Embodiment
Describe below in conjunction with accompanying drawing and concrete mode of execution.
Refer to Fig. 2, Fig. 2 is the cross-sectional view of a preferred embodiment of the relief valve of the utility model band repairing function.Relief valve comprises overflow valve body 201, valve pocket 202, main valve plug 203, Fill valve 204, the first swivel nut 205, cone valve assembly 206 and the first spring 207.
Particularly, as shown in Figure 2, overflow valve body 201 is arranged with axisymmetric inner chamber (not indicating) from one end along its center line.Outside at inner chamber forms oil back chamber T', and further forms in the end of inner chamber the oil suction chamber Q' that diameter is less than intracavity diameter.
Repairing valve body 2041 forms the anchor ring radially arranging that connects this conical outer surface outward in conical outer surface.A part for anchor ring and conical outer surface is communicated with oil back chamber T'.The other end of repairing valve body 2041 is arranged in the inner chamber of overflow valve body 201 and closely cooperates with inner chamber, is arranged with on its outer surface annular groove 2042, and seal ring 2043 is arranged in the oil that annular groove 2042 prevents Fill valve 204 inside and oozes out.Repairing valve body 2041 has the internal surface of the inverted cone arranging towards main valve plug 203.
Repairing spring 2044 is Compress Spring, and its one end supports on repairing valve body 2041, and its other end supports the end wall of oil suction chamber Q'.Elasticity coefficient that it should be noted that repairing spring 2044 is less, more compressed than being easier to.Within the scope that the structure of repairing spring 2044 is understood those skilled in the art, do not elaborate at this.
When the oil pressure of oil back chamber T' higher than the oil pressure of oil suction chamber Q' and Fill valve 204 when moving away from the direction of main valve plug 203, the oil of oil back chamber T' is flowed in oil suction chamber Q' and is realized repairing by the opening (not shown) of formation between valve pocket 202 and repairing valve body 2041 and the hollow space of repairing valve body 2041, and the working principle of specific implementation repairing is introduced in detail in rear section.When the oil pressure of oil back chamber T' is not during higher than the oil pressure of oil suction chamber Q', repairing valve body 2041 supports on valve pocket 202 to intercept oil suction chamber Q' and oil back chamber T'.Apparently, Fill valve 204 possesses the function of initiatively repairing and does not possess the initiatively function of overflow.
In addition,, between the first swivel nut 205 and overflow valve body 201, between the second swivel nut 2062 and the first swivel nut 205, on screw press 2063, be respectively arranged with Sealing 208,209 and 210 for the sealing between parts.
It should be noted that, in other embodiments, also the conical outer surface of repairing valve body 2041 can be arranged to square or other shapes, can guarantee repairing valve body 2041 towards one end of main valve plug 203 can with the tight butt in the end of valve pocket 202; Also the anchor ring of repairing valve body 2041 can be arranged to the conical surface or other shapes, can guarantee that a part of outer surface of repairing valve body 2041 is communicated with oil back chamber T'; Seal ring 2043 also can substitute with other Sealings; The shape of the internal surface of repairing valve body 2041 is not construed as limiting in the utility model; Also can adopt alternative the first spring 207 of other assembly to control the movement of main valve plug 203, or alternative cone valve assembly 206 regulate the oil pressure of main valve plug oil pocket P'.Above-mentioned alternative technological means, within those skilled in the art's understanding scope, does not elaborate at this.
The working principle of the utility model relief valve comprises overflow and two kinds of situations of repairing, specific as follows:
1, when the overflow during higher than the oil pressure of oil back chamber T' of the oil pressure of oil suction chamber Q': spool 2061 is subject to the second damping hole K2'(main valve plug oil pocket P') oil act on the pressure on spool 2061, the oil that is simultaneously subject to unloading oil pocket U' acts on the pressure on spool 2061, thereby the opposite direction of these two pressure produces pressure difference.Regulate pressure regulation nut 2064 to set the elastic force of the second spring 2065, in the time acting on the pressure difference of spool 2061 and be greater than the elastic force of the second spring 2065, spool 2061 is to moving away from the direction of the second damping hole K2', the oil of main valve plug oil pocket P' is flowed into and is unloaded oil pocket U' by the second damping hole K2', the oil pressure of main valve plug oil pocket P' reduces, main valve plug 203 is to moving away from the direction of Fill valve 204, the oil of oil suction chamber Q' flows in oil back chamber T' by repairing valve body 2041 and the first opening M', thereby realizes oil suction chamber Q' to oil back chamber T' overflow.
2, when the repairing during higher than the oil pressure of oil suction chamber Q' of the oil pressure of oil back chamber T': repairing valve body 2041 is carried out to force analysis, repairing valve body 2041 is subject to the oily pressure of oil back chamber T' and oil suction chamber Q' simultaneously, and stress surface is the poor of the long-pending S4 of the outer cross of the repairing valve body 2041 cross-section area S3 that deducts oil suction chamber Q'.
Because the oil pressure of oil back chamber T' is greater than the oil pressure of oil suction chamber Q', the D outer diameter 4 of repairing valve body 2041 is greater than the diameter D3 of oil suction chamber Q', S4 and S3 calculate according to the corresponding relation of circular area and diameter, S4 is greater than S3, therefore the oil that the pressure that the oil of oil back chamber T' acts on repairing valve body 2041 is greater than oil suction chamber Q' act on repairing valve body 2041 pressure, their pressure difference is denoted as to F
1.
Work as F
1while being greater than the elastic force of repairing spring 2044, Fill valve 204 is to moving away from the direction of oil back chamber T', the oil of oil back chamber T' passes through the opening forming between valve pocket 202 and repairing valve body 2041, then flows in oil suction chamber Q' by the hollow space of repairing valve body 2041, thereby realizes repairing.Wherein, F
1=Δ P
t'-Q'× Δ S
4-3(Δ P
t'-Q'poor for the oil pressure of oil back chamber T' and the oil pressure of oil suction chamber Q', Δ S
4-3poor for the cross-section area S3 of the long-pending S4 of the outer cross of repairing valve body 2041 and oil suction chamber Q').
In addition, in realizing repairing by Fill valve 204, main valve plug 203 is to moving away from the direction of oil suction chamber Q', the oil of oil back chamber T' flows in oil suction chamber Q' by the first opening M', also can realize repairing, the working principle that realizes repairing by main valve plug 203 illustrates in the time introducing Fig. 1, and therefore not to repeat here.
Analyze the repairing principle of the utility model relief valve, and itself and prior art are contrasted, can find: the pressure difference F that acts on repairing valve body 2041
1the elastic force that is greater than repairing spring 2044 can be realized repairing, and F
1be subject to two factor Δ P
t'-Q'with Δ S
4-3impact, because of Δ S
4-3value elastic force large and repairing spring 2044 less, Δ P so
t'-Q'value F when not too large
1just can be greater than the elastic force of repairing spring 2044, i.e. the oily pressure differential deltap P of oil back chamber T' and oil suction chamber Q'
t'-Q'when not too large, just can realize repairing.The utility model is in passing through main valve plug 203 repairings, can also carry out repairing by Fill valve 204, as front analysis, when main valve plug 203 repairing, travelling speed is slower, cause the opened gap that forms between oil back chamber T' and oil suction chamber Q' less, affect repairing speed, and Fill valve 204 is highly sensitive, repairing valve body 2041 travelling speed in the time of repairing is fast, and repairing efficiency is high.In addition, if only by main valve plug 203 repairings, exist due to the first damping hole K1' block cause cannot repairing possibility, the utility model has been avoided this problem, has strengthened repairing reliability.
In sum, relief valve of the present utility model has repairing function concurrently in realizing relief function, compared with prior art, the utility model arranges Fill valve 204 to strengthen repairing performance between oil back chamber T' and oil suction chamber Q', pressure difference between oil back chamber T' and oil suction chamber Q' hour can pass through Fill valve 204 repairings, oil compensation pressure is low, only solve and carried out repairing by main valve plug 203, and the slow technical problem of main valve plug 203 repairing, repairing efficiency is high, and avoided the first damping hole K1' to block causing cannot repairing situation, reliability is strong.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (9)
1. the relief valve with repairing function, it is characterized in that, described relief valve comprises overflow valve body (201), valve pocket (202), main valve plug (203) and Fill valve (204), in described valve pocket (202) inner chamber that is arranged at described overflow valve body (201) adjacent with described Fill valve (204), in the inner chamber of described overflow valve body (201), further form oil suction chamber (Q') and oil back chamber (T'), one end of described valve pocket (202) is arranged in described oil back chamber (T'), and the first opening (M') that is communicated with described oil back chamber (T') is set on the sidewall of described valve pocket (202), described main valve plug (203) is arranged in described valve pocket (202), the end of described main valve plug (203) supports on described the first opening (M'), described Fill valve (204) comprises the repairing valve body (2041) of hollow, and end, one end butt of described repairing valve body (2041) and described valve pocket (202) is to intercept described oil suction chamber (Q') and described oil back chamber (T'), described main valve plug (203) in the time that described relief valve is realized relief function to moving away from the direction of described Fill valve (204) so that the oil of described oil suction chamber (Q') flows into described oil back chamber (T') by described repairing valve body (2041) and described the first opening (M'), the external diameter of described repairing valve body (2041) is greater than the diameter of described oil suction chamber (Q'), described repairing valve body (2041) in the time that described relief valve is realized repairing function to moving away from the direction of described main valve plug (203) so that the oil of described oil back chamber (T') by between described valve pocket (202) and described repairing valve body (2041) form opening and flow in described oil suction chamber (Q') by described Fill valve (204).
2. relief valve according to claim 1, is characterized in that, one end towards described main valve plug (203) of described repairing valve body (2041) has conical outer surface, end, one end butt of described conical outer surface and described valve pocket (202).
3. relief valve according to claim 2, is characterized in that, described repairing valve body (2041) further comprises the anchor ring radially arranging along it, and described anchor ring connects described conical outer surface; A part for described anchor ring and described conical outer surface is communicated with described oil back chamber (T').
4. relief valve according to claim 3, is characterized in that, described repairing valve body (2041) has the internal surface of the inverted cone arranging towards described main valve plug (203).
5. relief valve according to claim 1, it is characterized in that, on the outer surface coordinating with described inner chamber of described repairing valve body (2041), be arranged with annular groove (2042), described Fill valve (204) further comprises seal ring (2043), and described seal ring (2043) is arranged in described annular groove (2042).
6. relief valve according to claim 1, it is characterized in that, described Fill valve (204) further comprises repairing spring (2044), and one end of described repairing spring (2044) and described repairing valve body (2041) support, and the other end supports the end wall of described oil suction chamber (Q').
7. according to the relief valve described in claim 1-6 any one, it is characterized in that, described relief valve further comprises the first swivel nut (205) and cone valve assembly (206), and one end of described the first swivel nut (205) and described overflow valve body (201) are spirally connected and the described valve pocket of adjacency (202); Described the first swivel nut (205), described valve pocket (202) and described main valve plug (203) form main valve plug oil pocket (P') together; Described cone valve assembly (206) is screw-coupled to the other end of described the first swivel nut (205) and forms and unload oil pocket (U') with it; One end of described main valve plug oil pocket (P') is in upper the first damping hole (K1') being communicated with described oil suction chamber (Q') that forms of described main valve plug (203), and the other end of described main valve plug (203) oil pocket unloads in oil pocket (U') described in the oil inflow of main valve plug oil pocket (P') described in the time that the spool (2061) of described cone valve assembly (206) is opened in described the first swivel nut (205) upper formation the second damping hole (K2').
8. relief valve according to claim 7, it is characterized in that, described relief valve further comprises the first spring (207), described the first spring (207) is arranged in described main valve plug oil pocket (P'), its one end supports described the first swivel nut (205), and the other end supports described main valve plug (203).
9. relief valve according to claim 8, is characterized in that, described cone valve assembly (206) further comprises the second swivel nut (2062), screw press (2063), pressure regulation nut (2064), the second spring (2065) and locknut (2066), described the second swivel nut (2062) be screw-coupled to described the first swivel nut (205) the other end and with it form described in unload oil pocket (U'), described main valve plug (203), described the second spring (2065) and described screw press (2063) der group are loaded in described the second swivel nut (2062), described spool (2061) separate described the second damping hole (K2') and described in unload oil pocket (U'), described locknut (2066) and described pressure regulation nut (2064) are sequentially screwed onto outside described the second swivel nut (2062), and screw press (2063) described in described pressure regulation nut (2064) butt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320837394.7U CN203670326U (en) | 2013-12-18 | 2013-12-18 | Overflow valve with oil supplementation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320837394.7U CN203670326U (en) | 2013-12-18 | 2013-12-18 | Overflow valve with oil supplementation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203670326U true CN203670326U (en) | 2014-06-25 |
Family
ID=50966629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320837394.7U Expired - Fee Related CN203670326U (en) | 2013-12-18 | 2013-12-18 | Overflow valve with oil supplementation function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203670326U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105065359A (en) * | 2015-08-13 | 2015-11-18 | 山东常林机械集团股份有限公司 | Safety oil supplementing valve for multi-path valve |
| CN111271328A (en) * | 2020-04-17 | 2020-06-12 | 许昌学院 | Brake buffer valve with one-way valve core |
| CN111456977A (en) * | 2020-04-09 | 2020-07-28 | 上海诺玛液压***有限公司 | High-pressure large-flow inverse proportion overflow valve |
| CN112196932A (en) * | 2020-09-25 | 2021-01-08 | 中国直升机设计研究所 | Throttle valve for buffer |
-
2013
- 2013-12-18 CN CN201320837394.7U patent/CN203670326U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105065359A (en) * | 2015-08-13 | 2015-11-18 | 山东常林机械集团股份有限公司 | Safety oil supplementing valve for multi-path valve |
| CN111456977A (en) * | 2020-04-09 | 2020-07-28 | 上海诺玛液压***有限公司 | High-pressure large-flow inverse proportion overflow valve |
| CN111271328A (en) * | 2020-04-17 | 2020-06-12 | 许昌学院 | Brake buffer valve with one-way valve core |
| CN111271328B (en) * | 2020-04-17 | 2021-11-05 | 许昌学院 | Brake buffer valve with one-way valve core |
| CN112196932A (en) * | 2020-09-25 | 2021-01-08 | 中国直升机设计研究所 | Throttle valve for buffer |
| CN112196932B (en) * | 2020-09-25 | 2022-04-22 | 中国直升机设计研究所 | Throttle valve for buffer |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 Termination date: 20161218 |
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| CF01 | Termination of patent right due to non-payment of annual fee |