CN103963767B - A kind of railway vehicle empty and load trimmer valve of balance pivot formula lever construction - Google Patents
A kind of railway vehicle empty and load trimmer valve of balance pivot formula lever construction Download PDFInfo
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- CN103963767B CN103963767B CN201410199737.0A CN201410199737A CN103963767B CN 103963767 B CN103963767 B CN 103963767B CN 201410199737 A CN201410199737 A CN 201410199737A CN 103963767 B CN103963767 B CN 103963767B
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Abstract
The invention discloses a kind of railway vehicle empty and load trimmer valve of balance pivot formula lever construction, comprise average portion, compensating bar portion, sense year check weighing portion, signalizing activity portion, rise to portion and effect balancing portion.After the present invention utilizes two pressure of weighing of average portion on input to carry out eliminating the average treatment of unbalance loading impact, the pressure of on average weighing of output one reaction vehicle load carries in check weighing portion the position of the fulcrum that rolls with Perceived control, by the effect in signalizing activity portion and effect balancing portion, compensating bar portion is made to remain on state of equilibrium, thus realize the Stress control being transferred to brake cylinder by auxiliary reservoir, and can total travel adjust, reach the object making brake cylinder automatically obtain the pressure air matched with vehicle load.Structure of the present invention is ingenious, Be very effective, by a kind of balance pivot formula lever construction, achieve brake-cylinder pressure automatically follow the change of vehicle load stepless, to be directly proportional the object of change continuously.
Description
Technical field
The present invention relates to a kind of railway vehicle empty and load trimmer valve of balance pivot formula lever construction.
Background technology
What the empty and load brake equipment of current China's Rolling Stock generally adopted is expand brake cylinder volumetry, namely expand with increase step-down reservoir the method that brake cylinder calculates volume, allow wind " shunting " part for this supply brake cylinder original in " step-down reservoir " during empty wagons, to reduce brake-cylinder pressure during empty parking space.Adjusting Mechanism is volume balance relation in essence, is characterized in setting up the shunting of step-down reservoir, and during empty parking space, pressure air sends into the Iinvalid volume of pressure reducing reservoir and so on, wastes completely, and can not total travel adjustment.
Summary of the invention
The object of the invention is to: for above-mentioned Problems existing, there is provided a kind of brake-cylinder pressure can be made automatically to follow vehicle load change and stepless, to be directly proportional change continuously, thus realize brake-cylinder pressure can the railway vehicle empty and load trimmer valve of balance pivot formula lever construction of total travel adjustment.
Technical scheme of the present invention is achieved in that a kind of railway vehicle empty and load trimmer valve of balance pivot formula lever construction, it is characterized in that: comprise average portion, compensating bar portion, check weighing portion is carried in sense, signalizing activity portion, rise to portion and effect balancing portion, to be weighed with first pressure respectively by corresponding path in described average portion, second weighs pressure and auxiliary reservoir press-in connection, described first pressure and second pressure of weighing of weighing exports a pressure of on average weighing and carries the input end in check weighing portion to sense after average treatment, the mouth that check weighing portion is carried in described sense is connected with the control end in compensating bar portion, the input end in described signalizing activity portion is connected with the control presssure from distributing valve by path, the mouth in described signalizing activity portion contacts with the one end in compensating bar portion is corresponding, the described portion that rises to is connected with the middle part in compensating bar portion, the input end in described effect balancing portion is by pipeline and auxiliary reservoir press-in connection, the mouth in described effect balancing portion is connected with brake-cylinder pressure by pipeline, described effect balancing portion contacts with the other end in compensating bar portion is corresponding, by controlling the state of equilibrium in compensating bar portion, realize the Stress control being transferred to brake cylinder by auxiliary reservoir.
The railway vehicle empty and load trimmer valve of balance pivot formula lever construction of the present invention, it is large that average portion described in it comprises average valve body and is arranged in average valve body, valve piston, average valve rod, average valve seat, average valve, average valve spring, greatly described, valve piston is connected with average valve rod respectively and piston area is the twice of valve piston area greatly, the airtight cavity that described valve piston is formed in average valve body to be weighed press-in connection by corresponding path and first, the airtight cavity that described large piston is formed in average valve body to be weighed press-in connection by corresponding path and second, described average valve seat is fixed in average valve body, above large piston, described average valve is arranged on the opening part of average valve seat, described average valve rod upper end withstands on average valve lower surface, described average valve spring is arranged between average valve upper surface and average valve body, the cavity that described average valve top is formed is by pipeline and auxiliary reservoir press-in connection, the input end that the cavity that its underpart is formed carries check weighing portion by path and sense is connected.
The railway vehicle empty and load trimmer valve of balance pivot formula lever construction of the present invention, sense described in it is carried check weighing portion and is comprised sense and carry check weighing valve body and be arranged on the sense that sense carries in check weighing valve body and carry check weighing piston, check weighing piston rod is carried in adjustment spring and sense, described sense is carried check weighing piston and is divided into upper and lower two cavitys by sense year check weighing valve body, pressure of on average weighing after its average treatment is delivered to sense by path by described average portion to be carried in the airtight cavity that in check weighing portion, sense year check weighing piston lower portion is formed, described adjustment lower spring end is resisted against sense and carries check weighing piston upper surface, its upper end is resisted against sense and carries check weighing valve interior wall, described sense is carried check weighing piston and is connected with the control end in compensating bar portion by a sense year check weighing piston rod.
The railway vehicle empty and load trimmer valve of balance pivot formula lever construction of the present invention, described in it, compensating bar portion comprises compensating bar and shifting fork bar, described shifting fork bar one end and sense are carried check weighing piston rod and are connected, its other end contacts with compensating bar and forms rolling fulcrum, and described rolling fulcrum slides with between the mouth in signalizing activity portion and the corresponding contact point of compensating bar at the mid point of compensating bar.
The railway vehicle empty and load trimmer valve of balance pivot formula lever construction of the present invention, signalizing activity portion described in it comprises signalizing activity valve body and the signalizing activity piston that is arranged in signalizing activity valve body and signalizing activity push rod, in described signalizing activity valve body, the airtight cavity of signalizing activity piston side is connected with the control presssure from distributing valve by pipeline, described signalizing activity push rod is arranged on signalizing activity piston opposite side, described signalizing activity push rod one end is connected with signalizing activity piston, its other end contacts formation first fulcrum with one end of compensating bar is corresponding.
The railway vehicle empty and load trimmer valve of balance pivot formula lever construction of the present invention, effect balancing portion described in it comprises effect balancing valve body and is arranged on the effect balancing piston in effect balancing valve body, effect balancing valve rod, effect balancing valve seat, effect balancing valve and effect balancing valve spring, described effect balancing valve rod is connected with effect balancing piston, described effect balancing valve seat is fixed in effect balancing valve body, described effect balancing valve is arranged on the opening part of effect balancing valve seat by effect balancing valve spring, described effect balancing valve rod one end withstands on effect balancing valve end face, its other end contacts formation second fulcrum with the other end of compensating bar is corresponding, the airtight cavity that described effect balancing valve side is formed is by corresponding pipeline and auxiliary reservoir press-in connection, the airtight cavity that its opposite side is formed is connected with brake-cylinder pressure by corresponding pipeline, inner valve body structure between described effect balancing piston and effect balancing valve is provided with path.
The railway vehicle empty and load trimmer valve of balance pivot formula lever construction of the present invention, the portion of rising to described in it comprises and rises to valve body and be arranged on the pressing plate risen in valve body, rise to spring and rise to bar, the described bar one end that rises to is connected with pressing plate, its other end and the middle part of compensating bar be corresponding to be contacted to be formed and connects fulcrum, described in rise to spring and be arranged on pressing plate and rise between valve body and be enclosed within and rise to bar periphery.
After the present invention utilizes two pressure of weighing of average portion on input to carry out eliminating the average treatment of unbalance loading impact, the pressure of on average weighing of output one reaction vehicle load carries in check weighing portion the position of the fulcrum that rolls with Perceived control, by the effect in signalizing activity portion and effect balancing portion, compensating bar portion is made to remain on state of equilibrium, thus realize the Stress control being transferred to brake cylinder by auxiliary reservoir, and can total travel adjust, reach the object making brake cylinder automatically obtain the pressure air matched with vehicle load.Structure of the present invention is ingenious, Be very effective, by a kind of balance pivot formula lever construction, achieve brake-cylinder pressure automatically follow the change of vehicle load stepless, to be directly proportional the object of change continuously.
Accompanying drawing explanation
Fig. 1 is structural principle schematic diagram of the present invention.
Mark in figure: 1 is average portion, 1a is average valve body, 1b is large piston, 1c is valve piston, 1d is average valve rod, 1e is average valve seat, 1f is average valve, 1g is average valve spring, 2 is compensating bar portion, 2a is compensating bar, 2b is shifting fork bar, 2c is rolling fulcrum, 3 is sense year check weighing portion, 3a is sense year check weighing valve body, 3b is sense year check weighing piston, 3c is adjustment spring, 3d is sense year check weighing piston rod, 4 is signalizing activity portion, 4a is signalizing activity valve body, 4b is signalizing activity piston, 4c is signalizing activity push rod, 4d is the first fulcrum, 5 for rising to portion, 5a is for rising to valve body, 5b is pressing plate, 5c is for rising to spring, 5d is for rising to bar, 5e is for connecting fulcrum, 6 is effect balancing portion, 6a is effect balancing valve body, 6b is effect balancing piston, 6c is effect balancing valve rod, 6d is effect balancing valve seat, 6e is effect balancing valve, 6f is effect balancing valve spring, 6g is the second fulcrum, 6h is path, A, B first to weigh pressure, second weighs pressure, C is brake-cylinder pressure, D is auxiliary reservoir pressure, E is the control presssure from distributing valve, F is pressure of on average weighing.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, a kind of railway vehicle empty and load trimmer valve of balance pivot formula lever construction, comprises average portion 1, compensating bar portion 2, sense year check weighing portion 3, signalizing activity portion 4, rises to portion 5 and effect balancing portion 6.
Wherein, it is large that described average portion 1 comprises average valve body 1a and is arranged in average valve body 1a, valve piston 1b, 1c, average valve rod 1d, average valve seat 1e, average valve 1f, average valve spring 1g, greatly described, valve piston is connected with average valve rod 1d respectively and piston 1b area is the twice of valve piston 1c area greatly, the airtight cavity that described valve piston 1c is formed in average valve body 1a is connected by corresponding path and the first pressure A that weighs, the airtight cavity that described large piston 1b is formed in average valve body 1a is connected by corresponding path and the second pressure B that weighs, described average valve seat 1e is fixed in average valve body 1a, above large piston 1b, described average valve 1f is arranged on the opening part of average valve seat 1e, described average valve rod 1d upper end withstands on average valve 1f lower surface, described average valve spring 1g is arranged between average valve 1f upper surface and average valve body 1a, the cavity that described average valve 1f top is formed is connected with auxiliary reservoir pressure D by pipeline, the input end that the cavity that its underpart is formed carries check weighing portion 3 by path and sense is connected.Described average portion weighs after pressure carries out eliminating the average treatment of unbalance loading impact on first of input the pressure and second of weighing, and the pressure of on average weighing exporting a reaction vehicle load enters a sense year check weighing portion, with the position of the fulcrum that controls to roll in compensating bar portion.
Wherein, described sense is carried check weighing portion 3 and is comprised sense and carry check weighing valve body 3a and be arranged on the sense that sense carries in check weighing valve body 3a and carry check weighing piston 3b, check weighing piston rod 3d is carried in adjustment spring 3c and sense, described sense is carried check weighing piston 3b and is divided into upper and lower two cavitys by sense year check weighing valve body 3a, the pressure F that on average weighs after its average treatment is delivered to sense by path by described average portion 1 to be carried in the airtight cavity that in check weighing portion 3, sense year check weighing piston 3b bottom is formed, described adjustment spring 3c lower end abutment carries check weighing piston 3b upper surface in sense, its upper end is resisted against sense and carries check weighing valve body 3a inwall, described sense is carried check weighing piston 3b and is connected with the control end in compensating bar portion 2 by a sense year check weighing piston rod 3d.
Described compensating bar portion 2 comprises compensating bar 2a and shifting fork bar 2b, described shifting fork bar 2b one end and sense are carried check weighing piston rod 3d and are connected, its other end contacts with compensating bar 2a and forms rolling fulcrum 2c, and described rolling fulcrum 2c slides with between the mouth in signalizing activity portion 4 and the corresponding contact point of compensating bar 2a at the mid point of compensating bar 2a.The application force that signalizing activity portion produces by described compensating bar portion is delivered to effect balancing portion by compensating bar and makes it produce corresponding actions.
The described portion 5 that rises to is connected with the middle part in compensating bar portion 2, the described portion 5 that rises to comprises and rises to valve body 5a and be arranged on the pressing plate 5b risen in valve body 5a, rise to spring 5c and rise to bar 5d, the described bar 5d one end that rises to is connected with pressing plate 5b, its other end and the middle part of compensating bar 2a be corresponding to be contacted to be formed and connects fulcrum 5e, described in rise to spring 5c and be arranged on pressing plate 5b and rise between valve body 5a and be enclosed within and rise to bar 5d periphery.At the braking initial stage, described in rise to portion by the connection fulcrum with compensating bar portion, brake cylinder is obtained and reliable and stable initially rises to pressure.
Wherein, the input end in described signalizing activity portion 4 is connected with the control presssure E from distributing valve by path, and the mouth in described signalizing activity portion 4 contacts with the one end in compensating bar portion 2 is corresponding.Described signalizing activity portion 4 comprises signalizing activity valve body 4a and the signalizing activity piston 4b that is arranged in signalizing activity valve body 4a and signalizing activity push rod 4c, described signalizing activity valve body 4a is interior, the airtight cavity of signalizing activity piston 4b side is connected with the control presssure E from distributing valve by pipeline, described signalizing activity push rod 4c is arranged on signalizing activity piston 4b opposite side, described signalizing activity push rod 4c one end is connected with signalizing activity piston 4b, and its other end contacts formation first fulcrum 4d with one end of compensating bar 2a is corresponding.Described signalizing activity portion passes to compensating bar portion the control presssure from distributing valve and participates in balance.
Wherein, the input end in described effect balancing portion 6 is connected with auxiliary reservoir pressure D by pipeline, the mouth in described effect balancing portion 6 is connected with brake-cylinder pressure C by pipeline, and the effect balancing valve rod 6c in described effect balancing portion 6 contacts with the other end in compensating bar portion 2 is corresponding.Described effect balancing portion 6 comprises effect balancing valve body 6a and is arranged on the effect balancing piston 6b in effect balancing valve body 6a, effect balancing valve rod 6c, effect balancing valve seat 6d, effect balancing valve 6e and effect balancing valve spring 6f, described effect balancing valve rod 6c is connected with effect balancing piston 6b, described effect balancing valve seat 6d is fixed in effect balancing valve body 6a, described effect balancing valve 6e is arranged on the opening part of effect balancing valve seat 6d by effect balancing valve spring 6f, described effect balancing valve rod 6c one end withstands on effect balancing valve 6e end face, its other end contacts formation second fulcrum 6g with the other end of compensating bar 2a is corresponding, the airtight cavity that described effect balancing valve 6e side is formed is connected with auxiliary reservoir pressure D by corresponding pipeline, the airtight cavity that its opposite side is formed is connected with brake-cylinder pressure C by corresponding pipeline, inner valve body structure between described effect balancing piston 6b and effect balancing valve 6e is provided with path 6h, the setting of path can make the power acted on effect balancing piston more relax, the unexpected change avoiding effect balancing piston stressed causes the fluctuation in compensating bar portion.Described effect balancing portion according to the position of rolling fulcrum, the force balance transmitted with compensating bar portion, thus realize the Stress control being transferred to brake cylinder by auxiliary reservoir.
When vehicle load increases, the pressure signal of on average weighing of reaction vehicle load increases, and promotes rolling fulcrum moves, and when lever ratio is 1, during braking, to transfer to the pressure of brake cylinder close with the control presssure signal from distributing valve for auxiliary reservoir, is now loaded position.When vehicle load reduces gradually, the pressure signal of on average weighing of reaction vehicle load reduces gradually, rolling fulcrum moves down, lever ratio reduces gradually, the pressure that then auxiliary reservoir transfers to brake cylinder also reduces gradually, thus make brake-cylinder pressure stepless with the change of vehicle load, to be directly proportional change continuously, and can total travel adjustment, reach the object making brake cylinder automatically obtain the pressure air matched with vehicle load.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the railway vehicle empty and load trimmer valve of a balance pivot formula lever construction, it is characterized in that: comprise average portion (1), compensating bar portion (2), check weighing portion (3) is carried in sense, signalizing activity portion (4), rise to portion (5) and effect balancing portion (6), described average portion (1) to be weighed with first pressure (A) respectively by corresponding path, second weigh pressure (B) and auxiliary reservoir pressure (D) connects, described first pressure (A) and second pressure (B) of weighing of weighing exports a pressure (F) of on average weighing and carries the input end in check weighing portion (3) to sense after average treatment, the mouth that check weighing portion (3) is carried in described sense is connected with the control end of compensating bar portion (2), the input end of described signalizing activity portion (4) is connected with the control presssure (E) from distributing valve by path, the mouth of described signalizing activity portion (4) contacts with the one end of compensating bar portion (2) is corresponding, the described portion (5) that rises to is connected with the middle part of compensating bar portion (2), the input end of described effect balancing portion (6) is connected with auxiliary reservoir pressure (D) by pipeline, the mouth of described effect balancing portion (6) is connected with brake-cylinder pressure (C) by pipeline, described effect balancing portion (6) contacts with the other end of compensating bar portion (2) is corresponding, by controlling the state of equilibrium in compensating bar portion (2), realize the Stress control being transferred to brake cylinder by auxiliary reservoir.
2. the railway vehicle empty and load trimmer valve of balance pivot formula lever construction according to claim 1, it is characterized in that: it is large that described average portion (1) comprises average valve body (1a) and is arranged in average valve body (1a), valve piston (1b, 1c), average valve rod (1d), average valve seat (1e), average valve (1f), average valve spring (1g), greatly described, valve piston (1b, 1c) to be connected with average valve rod (1d) respectively and large piston (1b) area is the twice of valve piston (1c) area, the airtight cavity that described valve piston (1c) is formed in average valve body (1a) is connected by corresponding path and first pressure (A) of weighing, the airtight cavity that described large piston (1b) is formed in average valve body (1a) is connected by corresponding path and second pressure (B) of weighing, described average valve seat (1e) is fixed in average valve body (1a), large piston (1b) top, described average valve (1f) is arranged on the opening part of average valve seat (1e), described average valve rod (1d) upper end withstands on average valve (1f) lower surface, described average valve spring (1g) is arranged between average valve (1f) upper surface and average valve body (1a), the cavity that described average valve (1f) top is formed is connected with auxiliary reservoir pressure (D) by pipeline, the input end that the cavity that its underpart is formed carries check weighing portion (3) by path and sense is connected.
3. the railway vehicle empty and load trimmer valve of balance pivot formula lever construction according to claim 2, it is characterized in that: described sense is carried check weighing portion (3) and comprised sense and carry check weighing valve body (3a) and be arranged on the sense that sense carries in check weighing valve body (3a) and carry check weighing piston (3b), check weighing piston rod (3d) is carried in adjustment spring (3c) and sense, described sense is carried check weighing piston (3b) and is divided into upper and lower two cavitys by sense year check weighing valve body (3a), pressure of on average weighing (F) after its average treatment is delivered in the airtight cavity that in sense year check weighing portion (3), sense year check weighing piston (3b) bottom is formed by path by described average portion (1), described adjustment spring (3c) lower end abutment carries check weighing piston (3b) upper surface in sense, its upper end is resisted against sense and carries check weighing valve body (3a) inwall, described sense is carried check weighing piston (3b) and is connected with the control end of compensating bar portion (2) by a sense year check weighing piston rod (3d).
4. the railway vehicle empty and load trimmer valve of balance pivot formula lever construction according to claim 3, it is characterized in that: described compensating bar portion (2) comprises compensating bar (2a) and shifting fork bar (2b), described shifting fork bar (2b) one end and sense are carried check weighing piston rod (3d) and are connected, its other end contacts with compensating bar (2a) and forms rolling fulcrum (2c), and described rolling fulcrum (2c) is slided with between the mouth of signalizing activity portion (4) with the corresponding contact point of compensating bar (2a) at the mid point of compensating bar (2a).
5. the railway vehicle empty and load trimmer valve of balance pivot formula lever construction according to claim 4, it is characterized in that: described signalizing activity portion (4) comprises signalizing activity valve body (4a) and the signalizing activity piston (4b) that is arranged in signalizing activity valve body (4a) and signalizing activity push rod (4c), in described signalizing activity valve body (4a), the airtight cavity of signalizing activity piston (4b) side is connected with the control presssure (E) from distributing valve by pipeline, described signalizing activity push rod (4c) is arranged on signalizing activity piston (4b) opposite side, described signalizing activity push rod (4c) one end is connected with signalizing activity piston (4b), its other end contacts formation first fulcrum (4d) with one end of compensating bar (2a) is corresponding.
6. the railway vehicle empty and load trimmer valve of balance pivot formula lever construction according to claim 5, it is characterized in that: described effect balancing portion (6) comprises effect balancing valve body (6a) and is arranged on the effect balancing piston (6b) in effect balancing valve body (6a), effect balancing valve rod (6c), effect balancing valve seat (6d), effect balancing valve (6e) and effect balancing valve spring (6f), described effect balancing valve rod (6c) is connected with effect balancing piston (6b), described effect balancing valve seat (6d) is fixed in effect balancing valve body (6a), described effect balancing valve (6e) is arranged on the opening part of effect balancing valve seat (6d) by effect balancing valve spring (6f), described effect balancing valve rod (6c) one end withstands on effect balancing valve (6e) end face, its other end contacts formation second fulcrum (6g) with the other end of compensating bar (2a) is corresponding, the airtight cavity that described effect balancing valve (6e) side is formed is connected with auxiliary reservoir pressure (D) by corresponding pipeline, the airtight cavity that its opposite side is formed is connected with brake-cylinder pressure (C) by corresponding pipeline, inner valve body structure between described effect balancing piston (6b) and effect balancing valve (6e) is provided with path (6h).
7. the railway vehicle empty and load trimmer valve of balance pivot formula lever construction according to claim 5, it is characterized in that: described in rise to portion (5) and comprise and rise to valve body (5a) and be arranged on the pressing plate (5b) risen in valve body (5a), rise to spring (5c) and rise to bar (5d), described bar (5d) one end that rises to is connected with pressing plate (5b), its other end and the middle part of compensating bar (2a) be corresponding to be contacted to be formed and connects fulcrum (5e), the described spring (5c) that rises to is arranged on pressing plate (5b) and rises between valve body (5a) and be enclosed within and rises to bar (5d) periphery.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410199737.0A CN103963767B (en) | 2014-05-13 | 2014-05-13 | A kind of railway vehicle empty and load trimmer valve of balance pivot formula lever construction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410199737.0A CN103963767B (en) | 2014-05-13 | 2014-05-13 | A kind of railway vehicle empty and load trimmer valve of balance pivot formula lever construction |
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| CN103963767A CN103963767A (en) | 2014-08-06 |
| CN103963767B true CN103963767B (en) | 2016-03-16 |
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| CN201410199737.0A Active CN103963767B (en) | 2014-05-13 | 2014-05-13 | A kind of railway vehicle empty and load trimmer valve of balance pivot formula lever construction |
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| CN107097770B (en) * | 2017-06-27 | 2023-04-11 | 中国国家铁路集团有限公司 | Air brake valve for railway carriage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5303987A (en) * | 1993-07-12 | 1994-04-19 | Westinghouse Air Brake Company | Empty/load changeover valve for railway car |
| CN201665225U (en) * | 2010-08-20 | 2010-12-08 | 重庆长征重工有限责任公司 | Installing structure of empty and load valve of railway |
| CN201800730U (en) * | 2010-09-29 | 2011-04-20 | 齐齐哈尔轨道交通装备有限责任公司 | Empty and load valve for rolling stock |
| CN202054032U (en) * | 2011-05-27 | 2011-11-30 | 北京南车时代机车车辆机械有限公司 | Empty-weight pressure limiting valve |
| CN203832478U (en) * | 2014-05-13 | 2014-09-17 | 四川制动科技股份有限公司 | Automatic railway vehicle empty and load adjustment valve of balance pivot type lever structure |
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Address after: Three road 620010 Meishan province Sichuan City Dongpo District of Meishan science and Technology Industrial Park No. 68 Patentee after: Meisha Zhongke Brake Technology Co., Ltd. Address before: Three road 620010 Meishan province Sichuan City Dongpo District of Meishan science and Technology Industrial Park No. 68 Patentee before: Sichuan Brake Science and Technology Co. Ltd. |