CN114294287B - Buffering overflow valve structure - Google Patents
Buffering overflow valve structure Download PDFInfo
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- CN114294287B CN114294287B CN202111640008.0A CN202111640008A CN114294287B CN 114294287 B CN114294287 B CN 114294287B CN 202111640008 A CN202111640008 A CN 202111640008A CN 114294287 B CN114294287 B CN 114294287B
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Abstract
The invention discloses a buffer overflow valve structure which comprises a valve body, wherein a valve cavity is formed in the valve body, an oil inlet and an oil outlet are formed in the side wall of the valve cavity in a penetrating mode, an adjusting groove is formed in the inner wall of the valve cavity, a valve core is connected to the inner wall of the valve cavity in a sealing and sliding mode, an oil through hole is formed in the side wall of the valve core in a penetrating mode, an oil return hole is formed in the side wall of the oil through hole, an oil return port matched with the oil return hole is formed in the inner wall of the valve cavity in a penetrating mode, a connecting block is fixed to the end portion of the valve core, a sliding block is connected to the connecting block through a main pressure spring and is connected with the inner wall of the adjusting groove in a sealing and sliding mode, and a main adjusting screw is fixed to the end portion of the sliding block. Has the advantages that: when the oil pressure is higher and large-amplitude pressurization still occurs, the oil pressure entering the oil outlet is reduced, so that the oil pressure acceleration in the equipment is reduced, buffering is realized, and the damage caused by large-amplitude increase under high pressure is avoided.
Description
Technical Field
The invention relates to the technical field of hydraulic overflow valves, in particular to a buffer type overflow valve structure.
Background
The overflow valve plays a safety protection role in the hydraulic system, when the pressure of the system exceeds a specified value, the safety valve is jacked open, and a part of oil in the system is discharged into an oil tank, so that the pressure of the system does not exceed an allowable value, and the system is ensured not to have accidents due to overhigh pressure;
when hydraulic equipment was applied to current overflow valve, when equipment load increased in the twinkling of an eye, when the oil pressure increased too soon, the overflow valve case will receive excessive impact, pressure uninstallation was accomplished through the removal of self, and pressure increase in the twinkling of an eye, the rapid movement of case will lead to wearing and tearing aggravation, valve body self can't carry out the buffering of oil pressure, lead to valve body life to reduce, and to increasing the oil pressure suddenly, can't carry out reasonable buffering to the output, lead to equipment pipeline oil pressure to increase too soon, cause equipment damage easily.
Disclosure of Invention
The invention aims to solve the problem of poor buffering effect in the prior art, and provides a buffering overflow valve structure.
In order to achieve the purpose, the invention adopts the following technical scheme: the buffer overflow valve structure comprises a valve body, wherein a valve cavity is formed in the valve body, an oil inlet and an oil outlet are formed in the side wall of the valve cavity in a penetrating manner, an adjusting groove is formed in the inner wall of the valve cavity, a valve core is connected to the inner wall of the valve cavity in a sealing and sliding manner, an oil through hole is formed in the side wall of the valve core in a penetrating manner, an oil return port matched with the oil return hole is formed in the inner wall of the oil through hole in a penetrating manner, a connecting block is fixed to the end portion of the valve core, a sliding block is connected to the connecting block through a main pressure spring in a sealing and sliding manner, the sliding block is connected to the inner wall of the adjusting groove in a sealing and sliding manner, a main adjusting screw is fixed to the end portion of the main adjusting screw, a main rotating handle is fixed to the end portion of the main adjusting screw, a driving cavity and a recycling groove are formed in the valve body, a valve buffer mechanism is jointly arranged in the driving cavity and the recycling groove, a pressure reducing cavity and a cutting cavity are formed in the valve body, and a pressure reducing cavity and a cutting cavity are respectively provided with a pressure controlling mechanism and a cutting mechanism.
In the above buffer overflow valve structure, the valve buffer mechanism includes a switch-on block connected with the inner wall of the recovery tank in a sealing and sliding manner, the side wall of the switch-on block is provided with an inverted L-shaped switch-on tank, the inner wall of the driving cavity is connected with a push plate in a sealing and sliding manner, the bottom of the push plate is fixed with a connecting rod, the connecting rod penetrates through the side wall of the driving cavity and is fixed with the side wall of the switch-on block, and the push plate and the inner wall of the driving cavity are jointly fixed with a pressure reduction spring.
In the buffer overflow valve structure, the recovery tank is a communicated two-section structure, one section of the recovery tank is communicated with the inside of the valve cavity, the other section of the recovery tank is communicated with the outside of the valve body, electrorheological fluid is filled in the driving cavity, and the connecting block is made of piezoelectric ceramic.
In foretell buffering formula overflow valve structure, accuse pressure mechanism include with the sealed sliding connection's of decompression intracavity wall bearing plate, the lateral wall of bearing plate has the closing plate through vice pressure spring coupling, the lateral wall of closing plate is fixed with vice accent screw rod, vice accent screw rod and valve body lateral wall through thread connection and end fixing have vice turning handle, the lateral wall in decompression chamber is seted up and is run through the oil groove of leading that cuts chamber and the outside switch-on of valve body.
In foretell buffering formula overflow valve structure, the mechanism of cutting is including being fixed in the baffle that cuts the intracavity wall, the tip of baffle is connected with the spacer block through reset spring, the end fixing of spacer block has the push rod, the end fixing of push rod has the roof, roof and spacer block all with cut the sealed sliding connection of the inner wall in chamber, the tip of baffle runs through and has seted up little oilhole and big oilhole, the inside of little oilhole and big oilhole all is equipped with the check valve, the upper portion and the lower part of cutting the chamber are filled electrorheological fluid and hydraulic oil respectively, the closing plate is made by piezoceramics.
Compared with the prior art, the invention has the advantages that:
1. according to the invention, oil in the oil inlet can return to the oil tank through the recovery groove and the connection groove, so that the impact on the valve core when the oil pressure rises can be reduced, the instantaneous movement distance of the valve core due to the oil pressure impact is reduced through the backflow of the oil, the valve core has time to adapt to the increase of the oil pressure, the movement speed of the valve core and the speed of the large-amplitude deformation of the main pressure spring are reduced, the abrasion of the valve core and the damage of the main pressure spring are reduced, the main component of the valve body is buffered, and the service life of the valve body is prolonged;
2. according to the invention, when the oil pressure is high and large-amplitude pressurization still occurs, the oil pressure entering the oil outlet is reduced, so that the oil pressure in the equipment is increased in speed and reduced, buffering is realized, and the damage caused by large-amplitude increase under high pressure is avoided;
3. according to the invention, because the small oil hole has a small aperture, the speed is low when oil at the lower part of the cut-off cavity moves back, and the oil guide groove can be quickly opened and slowly closed, so that the buffering time is sufficient, and the effect is obvious.
Drawings
FIG. 1 is a schematic structural diagram of a buffer relief valve structure according to the present invention;
FIG. 2 is a side view of a half-section of a structure of a buffer relief valve according to the present invention;
FIG. 3 is a front view, partly in section, of a structure of a buffer relief valve according to the present invention;
FIG. 4 is a schematic structural diagram of a valve core part in a structure of the buffer overflow valve provided by the invention;
FIG. 5 is a schematic structural diagram of a connection block in a buffer relief valve structure according to the present invention;
fig. 6 is a schematic structural diagram of a diaphragm portion in a structure of a buffer overflow valve according to the present invention.
In the figure: the hydraulic control valve comprises a valve body 1, a valve cavity 2, an oil inlet 3, an adjusting groove 4, an oil outlet 5, a valve core 6, an oil through hole 7, an oil return hole 8, an oil return port 9, a connecting block 10, a main pressure spring 11, a sliding block 12, a main adjusting screw 13, a main rotating handle 14, a driving cavity 15, a recovery groove 16, a connecting block 17, a connecting through groove 18, a connecting rod 19, a pressure reducing spring 20, a push plate 21, a pressure reducing cavity 22, a pressure bearing plate 23, an auxiliary pressure spring 24, a sealing plate 25, an auxiliary adjusting screw 26, an auxiliary rotating handle 27, an oil guide groove 28, a cut-off cavity 29, a partition plate 30, a return spring 31, a partition block 32, a push rod 33, a top plate 34, a small oil hole 35 and a large oil hole 36.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Examples
Referring to fig. 1-6, the buffer overflow valve structure includes a valve body 1, a valve cavity 2 is disposed inside the valve body 1, a side wall of the valve cavity 2 is penetrated and provided with an oil inlet 3 and an oil outlet 5, an inner wall of the valve cavity 2 is provided with an adjusting groove 4, an inner wall of the valve cavity 2 is hermetically and slidably connected with a valve core 6, the oil inlet 3 and the oil outlet 5 are located at two ends of the valve core 6, the valve core 6 can block and seal the oil outlet 5 when moving to a limit position, a side wall of the valve core 6 is penetrated and provided with an oil through hole 7, a side wall of the oil through hole 7 is provided with an oil return hole 8, an inner wall of the valve cavity 2 is penetrated and provided with an oil return port 9 matched with the oil return hole 8, an end of the valve core 6 is fixed with a connecting block 10, the connecting block 10 is connected with a slider 12 through a main pressure spring 11, the slider 12 is hermetically and slidably connected with the inner wall of the adjusting groove 4, an end of the slider 12 is fixed with a main pressure regulating screw 13, the main pressure regulating screw 13 is in threaded connection with the side wall of the valve body 1, an end of the main pressure regulating screw 13 is fixed with an end of the main pressure regulating screw 13, an end of the valve body 1 is fixed with a main rotating handle 14, a driving cavity 15 and a recovery groove 16 are disposed inside the valve body 1, a valve cavity 15, a buffer mechanism, an inner cavity 22 and a pressure reducing cavity are disposed inside the valve cavity 22, and a pressure reducing cavity 29 are disposed inside of the valve body 1, and a pressure reducing mechanism 29, and a pressure reducing mechanism are disposed inside the pressure reducing mechanism, and a pressure reducing mechanism 29 are disposed inside the pressure reducing mechanism 29.
The valve buffer mechanism comprises a switch-on block 17 which is connected with the inner wall of the recovery tank 16 in a sealing and sliding manner, the side wall of the switch-on block 17 is provided with an inverted L-shaped switch-on tank 18, the inner wall of the driving cavity 15 is connected with a push plate 21 in a sealing and sliding manner, the bottom of the push plate 21 is fixed with a connecting rod 19, the connecting rod 19 penetrates through the side wall of the driving cavity 15 and is fixed with the side wall of the switch-on block 17, and the push plate 21 and the inner wall of the driving cavity 15 are jointly fixed with a pressure reduction spring 20; the recovery tank 16 is a two-section structure of intercommunication, and one section is put through with valve cavity 2 inside another section and is put through with valve body 1 outside, and the inside packing of drive chamber 15 has the electrorheological fluid, and connecting block 10 is made by piezoceramics, and when oil slowly increases at oil inlet 3, connecting block 10 will not produce the electric power value of the full amount because of the pressure boost in the twinkling of an eye, thereby makes the action of putting through block 17 can not move, thereby makes the action of lasting oil return can not appear in normal pressure boost process, guarantees that the pressure boost effectively goes on.
Accuse pressure mechanism include with the sealed sliding connection's of decompression chamber 22 inner wall bearing plate 23, the lateral wall of bearing plate 23 is connected with the closing plate 25 through vice pressure spring 24, the lateral wall of closing plate 25 is fixed with vice adjusting screw 26, vice adjusting screw 26 and the valve body 1 lateral wall through threaded connection and end fixing have vice turning handle 27, the lateral wall of decompression chamber 22 is seted up and is run through the oil groove 28 that leads of cutting chamber 29 and the outside switch-on of valve body 1, through adjusting vice adjusting screw 26 and deepening the inside length of decompression chamber 22, can adjust vice pressure spring 24's pressure, thereby control the threshold value of buffer unit oil pressure, when satisfying equipment normal use, avoid the damage that high pressure boost leads to.
The cutoff mechanism comprises a partition plate 30 fixed on the inner wall of a cutoff cavity 29, the end of the partition plate 30 is connected with a spacer 32 through a return spring 31, the end of the spacer 32 is fixed with a push rod 33, the end of the push rod 33 is fixed with a top plate 34, the top plate 34 and the spacer 32 are in sealing sliding connection with the inner wall of the cutoff cavity 29, the end of the partition plate 30 is provided with a small oil hole 35 and a large oil hole 36 in a penetrating mode, one-way valves are arranged inside the small oil hole 35 and the large oil hole 36 and are one-way valves with starting pressure, electrorheological fluid and hydraulic oil are filled in the upper portion and the lower portion of the cutoff cavity 29 respectively, the hydraulic oil cannot penetrate through the small oil hole 35 and the large oil hole 36 under the action of self gravity, when the spacer 32 starts to move, the hydraulic oil penetrates through the large oil hole 36 and can be rapidly transferred, when the spacer 32 resets, the hydraulic oil penetrates through the small oil hole 35, the oil transfer speed is slow, the reset speed of the spacer 32 is slow, a sealing plate 25 is made of piezoelectric ceramic, when the piezoelectric ceramic is subjected to instantaneous high-pressure extrusion, instantaneous high-pressure electricity is supplied to the electrorheological fluid, the electrorheological fluid is instantly solidified, the electrorheological fluid is recovered, and the volume of the electrorheological fluid is obviously changed in the process.
In the invention, when in use, oil enters the valve body 1 from the oil inlet 3, passes through the oil through hole 7, enters the valve cavity 2, and is discharged from the oil outlet 5, so that the smooth supply of the oil is ensured, the push of the slide block 12 can be realized by rotating the main adjusting screw 13, the main pressure spring 11 is contracted, the extrusion force applied to the valve core 6 is adjusted, and the valve trigger pressure is adjusted;
when instant high-pressure oil occurs, the oil pressure in the oil inlet 3 increases steeply, the valve core 6 moves under impact, the main pressure spring 11 contracts instantly to increase the pressure, the pressure on the connecting block 10 increases instantly, so that instant high-pressure electric power is generated, after the electric current liquid in the driving cavity 15 is supplied, the electric current liquid is solidified and collides, the push plate 21 is pushed to move, the connecting block 17 moves, the connecting groove 18 connects the two sections of the recovery groove 16, so that the oil in the oil inlet 3 can return to the oil tank through the recovery groove 16 and the connecting groove 18, the impact on the valve core 6 when the oil pressure rises can be reduced, the instant moving distance of the valve core 6 due to the oil pressure impact is reduced through the backflow of the oil, the valve core 6 has time to adapt to the increase of the oil pressure, the moving speed of the valve core 6 and the large deformation speed of the main pressure spring 11 are reduced, the abrasion of the valve core 6 and the damage to the main pressure spring 11 are reduced, the main components of the valve body 1 are buffered, and the service life of the valve body 1 is prolonged;
when the oil pressure entering the oil inlet 3 is too high, the valve core 6 is continuously pushed to move, so that the oil outlet 5 is blocked by the valve core 6, the oil return hole 8 is communicated with the oil return port 9, the oil directly returns to the oil tank from the oil return port 9, the excessive pressure oil is prevented from entering equipment, and the use safety of the equipment is ensured;
when the oil pressure is normally increased, the pressure of the oil pressure does not reach the oil return pressure, but the oil pressure passing through the valve body 1 is increased, when the oil pressure is large and still increases steeply, the pressure bearing plate 23 is pushed by the oil pressure to compress the secondary pressure spring 24 instantly and greatly, so that the pressure bearing plate 23 moves and yields fully, the oil can enter the oil guide groove 28, the pressure borne by the sealing plate 25 is increased instantly due to the large instant moving amount of the pressure bearing plate 23, and the instant high-voltage supply is generated, so that the electrorheological fluid in the cut-off cavity 29 is solidified and expanded, the top plate 34 is pushed to move, the spacer block 32 is displaced, the return spring 31 is contracted, the spacer block 32 does not obstruct the oil guide groove 28 any more, the oil in the valve cavity 2 can return to the oil tank through the oil guide groove 28, so that when the oil pressure is high and the oil pressure is still greatly increased, the oil pressure entering the oil outlet 5 is reduced, the oil pressure in the equipment is increased and buffered, and the damage caused by the large increase under the high pressure is avoided;
and the electrorheological fluid can be automatically liquefied later, so that the spacer block 32 is reset under the elastic action of the reset spring 31, the oil pressure of the oil supply of the equipment can reach a required value, the use of the equipment is not influenced, and the speed is lower when the oil on the lower part of the cut-off cavity 29 moves back due to the smaller aperture of the small oil hole 35, so that the oil guide groove 28 can be quickly opened and slowly closed, the buffering time is sufficient, and the effect is obvious.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. The buffer overflow valve structure comprises a valve body (1) and is characterized in that a valve cavity (2) is arranged inside the valve body (1), an oil inlet (3) and an oil outlet (5) are arranged on the side wall of the valve cavity (2) in a penetrating way, the inner wall of the valve cavity (2) is provided with an adjusting groove (4), the inner wall of the valve cavity (2) is connected with a valve core (6) in a sealing and sliding way, an oil through hole (7) is arranged on the side wall of the valve core (6) in a penetrating way, an oil return hole (8) is arranged on the side wall of the oil through hole (7), an oil return port (9) matched with the oil return hole (8) is arranged on the inner wall of the valve cavity (2) in a penetrating way, a connecting block (10) is fixed at the end part of the valve core (6), a sliding block (12) is connected to the connecting block (10) through a main pressure spring (11), the sliding block (12) is connected with the inner wall of the adjusting groove (4) in a sealing and sliding way, a main adjusting screw rod (13) is fixed at the end part of the sliding block (12), the main adjusting screw (13) is in threaded connection with the side wall of the valve body (1) in a penetrating way, a main rotating handle (14) is fixed at the end part of the main adjusting screw rod (13), a driving cavity (15) and a recovery tank (16) are arranged in the valve body (1), the driving cavity (15) and the recovery tank (16) are internally provided with a valve buffer mechanism together;
the valve buffer mechanism comprises a connecting block (17) in sealing sliding connection with the inner wall of the recovery tank (16), the side wall of the connecting block (17) is provided with an inverted L-shaped connecting groove (18), the inner wall of the driving cavity (15) is in sealing sliding connection with a push plate (21), the bottom of the push plate (21) is fixed with a connecting rod (19), the connecting rod (19) penetrates through the side wall of the driving cavity (15) and is fixed with the side wall of the connecting block (17), and the push plate (21) and the inner wall of the driving cavity (15) are jointly fixed with a pressure reduction spring (20);
the recovery groove (16) is of a communicated two-section structure, one section is communicated with the inside of the valve cavity (2), the other section is communicated with the outside of the valve body (1), electrorheological fluid is filled in the driving cavity (15), the connecting block (10) is made of piezoelectric ceramics, when instant high-pressure oil occurs, the oil pressure in the oil inlet (3) is increased sharply, the valve core (6) is impacted to move, the main pressure spring (11) is instantly contracted to increase the pressure, the pressure on the connecting block (10) is instantly increased, and instant electric power is generated, after the electrorheological fluid in the driving cavity (15) is supplied, the electric current is solidified and collided, the push plate (21) is further pushed to move, the connecting block (17) is moved, and the connecting groove (18) is communicated with the two sections of the recovery groove (16), so that the oil in the oil inlet (3) can return to the oil through the recovery groove (16) and the connecting groove (18), and the impact on the valve core (6) in the oil pressure increasing box can be reduced.
2. The buffer overflow valve structure according to claim 1, wherein a pressure reduction cavity (22) and a cut-off cavity (29) are formed in the valve body (1), a pressure control mechanism and a cut-off mechanism are respectively arranged in the pressure reduction cavity (22) and the cut-off cavity (29), the pressure control mechanism comprises a pressure bearing plate (23) in sealed sliding connection with the inner wall of the pressure reduction cavity (22), the side wall of the pressure bearing plate (23) is connected with a sealing plate (25) through an auxiliary pressure spring (24), an auxiliary adjusting screw (26) is fixed on the side wall of the sealing plate (25), the auxiliary adjusting screw (26) is in threaded connection with the side wall of the valve body (1) in a penetrating manner, and an auxiliary rotating handle (27) is fixed at the end part of the auxiliary adjusting screw, and an oil guide groove (28) which is communicated with the outside of the valve body (1) is formed in the side wall of the pressure reduction cavity (22) in a penetrating manner and the cut-off cavity (29);
the cutting mechanism comprises a partition plate (30) fixed on the inner wall of a cutting cavity (29), the end of the partition plate (30) is connected with a spacer block (32) through a return spring (31), the end of the spacer block (32) is fixedly provided with a push rod (33), the end of the push rod (33) is fixedly provided with a top plate (34), the top plate (34) and the spacer block (32) are both in sealed sliding connection with the inner wall of the cutting cavity (29), the end of the partition plate (30) is provided with a small oil hole (35) and a large oil hole (36) in a penetrating manner, check valves are arranged inside the small oil hole (35) and the large oil hole (36), and the upper part and the lower part of the cutting cavity (29) are respectively filled with electric current and hydraulic fluid;
the sealing plate (25) is made of piezoelectric ceramics, when the oil pressure is normally increased, the pressure of the sealing plate does not reach the oil return pressure, but the oil pressure passing through the valve body (1) is increased, when the oil pressure is large and still increases steeply, the pressure bearing plate (23) is pushed by the oil pressure to compress the auxiliary pressure spring (24) instantly and greatly, so that the pressure bearing plate (23) moves and abduces fully, oil can enter the oil guide groove (28), the pressure bearing plate (25) is instantly increased due to the fact that the instant moving amount of the pressure bearing plate (23) is large in the pressed moment, and instant voltage supply is generated, so that the electrorheological fluid in the cut-off cavity (29) is solidified and expanded, the top plate (34) is pushed to move, the partition block (32) is displaced, the return spring (31) contracts, the partition block (32) does not block the oil guide groove (28), and the oil in the valve cavity (2) can return to the oil guide groove (28).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111640008.0A CN114294287B (en) | 2021-12-30 | 2021-12-30 | Buffering overflow valve structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111640008.0A CN114294287B (en) | 2021-12-30 | 2021-12-30 | Buffering overflow valve structure |
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| CN114294287A CN114294287A (en) | 2022-04-08 |
| CN114294287B true CN114294287B (en) | 2023-01-03 |
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| CN202111640008.0A Active CN114294287B (en) | 2021-12-30 | 2021-12-30 | Buffering overflow valve structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114704687B (en) * | 2022-04-28 | 2023-09-19 | 靖江市新博液压件有限公司 | Overflow valve mechanism with self-cleaning function |
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| CN205401291U (en) * | 2016-03-28 | 2016-07-27 | 山推工程机械股份有限公司 | Novel external overflow valves of drain tap |
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| US6240951B1 (en) * | 1999-12-31 | 2001-06-05 | The B. F. Goodrich Company | Inflation system and valve for use therein |
| CN2596101Y (en) * | 2002-12-27 | 2003-12-31 | 上海汇众汽车制造有限公司 | Electrorheologic liquid adjustable shock adsorber |
| JP5848650B2 (en) * | 2012-03-23 | 2016-01-27 | Ｋｙｂ株式会社 | Shock absorber with height adjustment function |
| CN202612237U (en) * | 2012-06-04 | 2012-12-19 | 昆明理工大学 | Horizontal leading magneto-rheological inserting type high-speed switching valve |
| CN103899460B (en) * | 2014-03-28 | 2016-05-04 | 哈尔滨工程大学 | Double-buffering type overflow valve |
| CN204267854U (en) * | 2014-11-11 | 2015-04-15 | 莱芜钢铁集团有限公司 | A kind of direct-acting overflow valve |
| KR20170028006A (en) * | 2015-09-03 | 2017-03-13 | 현대중공업 주식회사 | Hydraulic Valve and Hydraulic Apparatus of Construction Equipment having same |
| CN206320117U (en) * | 2016-12-29 | 2017-07-11 | 赛克思液压科技股份有限公司 | A kind of adjustable-pressure level 2 buffering overflow valve |
| CN106640849B (en) * | 2017-01-23 | 2018-07-17 | 王安基 | Multilevel logic feather valve and hydraulic system |
| CN211820155U (en) * | 2020-04-09 | 2020-10-30 | 杭州力龙液压有限公司 | Safety valve and engineering machinery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205401291U (en) * | 2016-03-28 | 2016-07-27 | 山推工程机械股份有限公司 | Novel external overflow valves of drain tap |
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Effective date of registration: 20221124 Address after: 214500 No.9 Xiexin Road, Xieqiao Town, Jingjiang City, Taizhou City, Jiangsu Province Applicant after: JIANGSU ERMA FLUID POWER ELEMENT CO.,LTD. Address before: 214500 Huaqiao road 18, Da Jue Industrial Zone, Jingjiang, Taizhou, Jiangsu Applicant before: Jingjiang dome Security Engineering Co.,Ltd. |
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