CN201753715U - Slide valve rod used for multi-way valve - Google Patents
Slide valve rod used for multi-way valve Download PDFInfo
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- CN201753715U CN201753715U CN2010202692362U CN201020269236U CN201753715U CN 201753715 U CN201753715 U CN 201753715U CN 2010202692362 U CN2010202692362 U CN 2010202692362U CN 201020269236 U CN201020269236 U CN 201020269236U CN 201753715 U CN201753715 U CN 201753715U
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- feed tank
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Abstract
The utility model provides a slide valve rod used for a multi-way valve, which belongs to the technical field of engineering elements and solves the problems that the pressure and flow rate change of the control oil is severe during reversing and the manipulation performance is poor as the existing slide valve rod adopts a valve port of full opening type. The slide valve rod used for the multi-way valve comprises a rodlike rod body, one end of the rod body is sequentially provided with a right limit shaft shoulder, a right outer sealing shaft shoulder, a right oil through groove and a right inner sealing shaft shoulder inwards from the end face, the right outer sealing shaft shoulder is provided with a right unloading groove which is communicated with the right oil through groove; and the right inner sealing shaft shoulder is provided with a right oil inlet groove which is communicated with the right oil through groove. The slide valve rod used for the multi-way valve is provided with the right unloading groove, the right oil inlet groove, a left unloading groove and a left oil inlet groove which are matched for use through a rabbet with various shapes, so that the pressure and flow rate change of the control oil is stable, the middle-position pressure loss of the whole multi-way valve is reduced, and the effect of the multi-way valve is improved.
Description
Technical field
The utility model belongs to the engineering element technical field, relates to a kind of hydrovalve, particularly a kind of multi-way valve slide valve lever.
Background technique
Multi-way valve is as one of core parts of construction machinery hydraulic system, and the quality of its performance has decisive influence to the control performance and the reliability of complete machine.By the slide valve lever in the change multi-way valve and the relative position of valve seat, realize the opening and closing of oil inlet and outlet, thereby realize the direction of fluid and the control of flow.
The structure characteristic of valve port directly influences the pressure of when commutation fluid and the stationarity of changes in flow rate, thus the handling and travelling comfort when influence excavator and working.Though the spool valve degree of lip-rounding formula of complete all openings is simple in structure, easy to process, the pressure and the changes in flow rate of control oil are violent when commutating, but handling is poor, and can not realize the function of meter out.
Summary of the invention
The purpose of this utility model is to have the problems referred to above at existing technology, propose a kind of multi-way valve slide valve lever of realizing the smooth change of control-oil pressure and flow, utilized the multi-way valve that this slide valve lever is housed to realize that swing arm stretches out fast and avoids occurring weighing down phenomenon in the excavator.
The purpose of this utility model can realize by following technical proposal: a kind of multi-way valve slide valve lever, comprise the body of rod that is shaft-like, the sealing shaft shoulder an end of the body of rod inwardly is followed successively by the right limit shaft shoulder, the right external sealed shaft shoulder, right logical oil groove, the right side from this end face in, it is characterized in that the described right external sealed shaft shoulder is provided with the right compensating groove that communicates with right logical oil groove; The sealing shaft shoulder is provided with the right oil-feed tank that communicates with right logical oil groove in right.
Multi-way valve generally is applied to slide valve lever in the multi-way valve of excavator, and the body of rod is arranged in the valve body of multi-way valve, its for oil groove communicate with corresponding oil duct.Be in throttle when the right side leads to the oil groove off-load, right compensating groove has guaranteed steadily stretching out of excavator boom, and phenomenon can not occur weighing down.In the time of in being in commutation process, right oil-feed tank has guaranteed the smooth change of control-oil pressure and flow, has also realized the effect that swing arm stretches out fast simultaneously.
Use in the slide valve lever at above-mentioned multi-way valve, the other end of the described body of rod inwardly is followed successively by the sealing shaft shoulder in the left limit shaft shoulder, the left external sealed shaft shoulder, the logical oil groove in a left side, the left side from this end face, and the described left external sealed shaft shoulder is provided with the left compensating groove that communicates with the logical oil groove in a left side; The sealing shaft shoulder is provided with the left oil-feed tank that communicates with the logical oil groove in a left side in the left side.The smooth change that left compensating groove and left oil-feed tank have guaranteed control-oil pressure and flow in the commutation process is set; Simultaneously, realize the restriction effect of swing arm rod chamber oil-feed and oil return.
Use in the slide valve lever at above-mentioned multi-way valve, the quantity of described right compensating groove, right oil-feed tank, left compensating groove, left oil-feed tank is 2～10, and described right compensating groove, right oil-feed tank, left compensating groove, left oil-feed tank are all circumferentially evenly distributed along the axle core of the body of rod.
With in the slide valve lever, described right compensating groove comprises the buffer part one that is connected with right logical oil groove and is the vertical bar shape and is positioned at buffer part one outer end and is the vertical bar shape or is the circular-arc portion of successively decreasing at above-mentioned multi-way valve; The area of passage of the described portion one of successively decreasing is less than the area of passage of buffer part one.
With in the slide valve lever, the quantity of described right compensating groove is even number at above-mentioned multi-way valve; And one of them right compensating groove is identical along the structure of another right compensating groove of the axle core symmetry of the body of rod with this right side compensating groove.
With in the slide valve lever, described right oil-feed tank comprises and is connected with right oil-feed tank and is the buffer part two of vertical bar shape and is positioned at buffer part two outer ends and is the vertical bar shape or is the circular-arc portion of successively decreasing two at above-mentioned multi-way valve; The area of passage of the described portion two of successively decreasing is less than the area of passage of buffer part two.
With in the slide valve lever, the quantity of described right oil-feed tank is even number at above-mentioned multi-way valve; And one of them right oil-feed tank is identical along the structure of another right oil-feed tank of the axle core symmetry of the body of rod with this right side oil-feed tank.
With in the slide valve lever, described left compensating groove comprises the buffer part three that is connected with the logical oil groove in a left side and is the vertical bar shape and is positioned at buffer part three outer ends and is the vertical bar shape or is the circular-arc portion of successively decreasing three at above-mentioned multi-way valve; The area of passage of the described portion three of successively decreasing is less than the area of passage of buffer part three.
With in the slide valve lever, the quantity of described left compensating groove is even number at above-mentioned multi-way valve; And one of them left compensating groove is identical along the structure of another left compensating groove of the axle core symmetry of the body of rod with this left side compensating groove.
With in the slide valve lever, described left oil-feed tank comprises being connected with left oil-feed tank and being the buffer part four of vertical bar shape and being positioned at buffer part to be held all round and is the vertical bar shape or is the circular-arc portion of successively decreasing four at above-mentioned multi-way valve; The area of passage of the described portion four of successively decreasing is less than the area of passage of buffer part four.
With in the slide valve lever, the quantity of described left oil-feed tank is even number at above-mentioned multi-way valve; And one of them left oil-feed tank is identical along the structure of another left oil-feed tank of the axle core symmetry of the body of rod with this left side oil-feed tank.
Compared with prior art, this multi-way valve has right oil-feed tank and the right compensating groove of area of passage less than the logical oil groove area of passage in the right side with slide valve lever; Be in throttle when the right side leads to the oil groove off-load, right compensating groove has guaranteed steadily stretching out of excavator boom, and phenomenon can not occur weighing down; In the time of in being in commutation process, right oil-feed tank has guaranteed the smooth change of control-oil pressure and flow, has also realized the effect that swing arm stretches out fast simultaneously.This multi-way valve has left oil-feed tank and the left compensating groove of area of passage less than the logical oil groove area of passage in a left side with slide valve lever; A left side compensating groove and left oil-feed tank have guaranteed the smooth change of control-oil pressure and flow in the commutation process; Simultaneously, realize the restriction effect of swing arm rod chamber oil-feed and oil return.Simultaneously, right compensating groove, right oil-feed tank, left compensating groove, left oil-feed tank all are used by the notch of multiple shape, make control-oil pressure and flow smooth change, reduced whole multi-way valve the meta pressure loss, improved the effect of multi-way valve.
Description of drawings
Fig. 1 is first kind of perspective view of the present utility model.
Fig. 2 is first kind of main TV structure schematic representation of the present utility model.
Fig. 3 be among Fig. 2 A1-A1 analyse and observe the structure for amplifying schematic representation.
Fig. 4 be among Fig. 2 A2-A2 analyse and observe the structure for amplifying schematic representation.
Fig. 5 be among Fig. 2 A3-A3 analyse and observe the structure for amplifying schematic representation.
Fig. 6 be among Fig. 2 A4-A4 analyse and observe the structure for amplifying schematic representation.
Fig. 7 is second kind of perspective view of the present utility model.
Fig. 8 is second kind of main TV structure schematic representation of the present utility model.
Fig. 9 be among Fig. 8 A5-A5 analyse and observe the structure for amplifying schematic representation.
Figure 10 be among Fig. 8 A6-A6 analyse and observe the structure for amplifying schematic representation.
Figure 11 be among Fig. 8 A7-A7 analyse and observe the structure for amplifying schematic representation.
Figure 12 be among Fig. 8 A8-A8 analyse and observe the structure for amplifying schematic representation.
Among the figure, 1, the left limit shaft shoulder; 2, the left external sealed shaft shoulder; 3, the logical oil groove in a left side; 4, the sealing shaft shoulder in the left side; 5, the meta left side sealing shaft shoulder; 6, the logical oil groove in a meta left side; 7, the meta sealing shaft shoulder; 8, the right logical oil groove of meta; 9, the right interior sealing shaft shoulder; 10, right logical oil groove; 11, the right external sealed shaft shoulder; 12, the right limit shaft shoulder; 13, balancing slit; 14, right compensating groove; 14a, buffer part one; 14b, the portion one of successively decreasing; 15, right oil-feed tank; 15a, buffer part two; 15b, the portion two of successively decreasing; 16, left compensating groove; 16a, buffer part three; 16b, the portion three of successively decreasing; 17, left oil-feed tank; 17a, buffer part four; 17b, the portion four of successively decreasing; 20, the body of rod.
Embodiment
Below be specific embodiment of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiments.
As Fig. 1 and shown in Figure 7, this multi-way valve slide valve lever, comprise the body of rod 20 that is shaft-like, from the end to end of the body of rod 20 be followed successively by the sealing shaft shoulder 4 in the left limit shaft shoulder 1, the left external sealed shaft shoulder 2, the logical oil groove 3 in a left side, the left side, the meta left side sealing shaft shoulder 5, the logical oil groove 6 in a meta left side, the meta sealing shaft shoulder 7, the right logical oil groove 8 of meta, right in the sealing shaft shoulder 9, right logical oil groove 10, the right external sealed shaft shoulder 11, the right limit shaft shoulder 12.Has balancing slit 13 on the left side external sealed shaft shoulder 2, the interior sealing in the left side shaft shoulder 4, the meta left side sealing shaft shoulder 5, the right interior sealing shaft shoulder 9, the right external sealed shaft shoulder 11.This multi-way valve is three slide valve levers with slide valve lever, generally is applied to the multi-way valve on the excavator.
As depicted in figs. 1 and 2, the right external sealed shaft shoulder 11 is provided with the right compensating groove 14 that communicates with right logical oil groove 10; The sealing shaft shoulder 9 is provided with the right oil-feed tank 15 that communicates with right logical oil groove 10 in right.The left side external sealed shaft shoulder 2 is provided with the left compensating groove 16 that communicates with the logical oil groove 3 in a left side; The sealing shaft shoulder 4 is provided with the left oil-feed tank 17 that communicates with the logical oil groove 3 in a left side in the left side.
As Fig. 1, Fig. 2 and shown in Figure 6, the quantity of right compensating groove 14 is 6 and circumferentially evenly distributed along the axle core of the body of rod 20.Right compensating groove 14 comprises buffer part one 14a that is connected with right logical oil groove 10 and is the vertical bar shape and is positioned at buffer part one 14a outer end and is circular-arc one 14b of the portion of successively decreasing that the area of passage of one 14b of portion that obviously successively decreases is less than the area of passage of buffer part one 14a.
And as Fig. 7, Fig. 8 and shown in Figure 12, basic identical with the structure and the principle of above-mentioned right compensating groove 14 as the another kind of structure and the principle of right compensating groove 14, different place is: the quantity of right compensating groove 14 is 8.According to the excavator use condition, one 14b of the portion of successively decreasing in the right compensating groove 14 can also be the vertical bar shape.
One of them right compensating groove 14 is identical along the structure of another right compensating groove 14 of the axle core symmetry of the body of rod 20 with this right side compensating groove 14; The degree of depth, width and length between three kinds of right compensating grooves 14 is all different, and thus, right compensating groove 14 is divided into three kinds of difformities.Wherein comprise an elongate slot, this is in throttle when just making the right side lead to oil groove 10 off-loads, thereby has guaranteed steadily stretching out of excavator boom, and phenomenon can not occur weighing down.
As Fig. 1, Fig. 2 and shown in Figure 5, the quantity of right oil-feed tank 15 is 6 and circumferentially evenly distributed along the axle core of the body of rod 20.Right oil-feed tank 15 comprises and is connected with right oil-feed tank 15 and is buffer part two 15a of vertical bar shape and is positioned at two 15b of the portion of successively decreasing of buffer part two 15a outer ends; Wherein two 15b of the portion of successively decreasing of four right oil-feed tanks 15 are circular-arc; Two 15b of the portion of successively decreasing of two right oil-feed tanks 15 are the vertical bar shape in addition, and the area of passage of two 15b of portion that obviously successively decrease is less than the area of passage of buffer part two 15a.
One of them right oil-feed tank 15 is identical along the structure of another right oil-feed tank 15 of the axle core symmetry of the body of rod 20 with this right side oil-feed tank 15; The degree of depth, width and length between above-mentioned three kinds of right compensating grooves 14 is all different, and thus, right oil-feed tank 15 is divided into three kinds of difformities.This kind result has not only guaranteed the smooth change of control-oil pressure and flow in the commutation process, has also realized effect that swing arm stretches out fast simultaneously.
Another kind of structure and principle as right oil-feed tank 15 are basic identical with the structure and the principle of above-mentioned right oil-feed tank 15, different place is: as Fig. 7, Fig. 8 and shown in Figure 11, the quantity of right oil-feed tank 15 is 4 and circumferentially evenly distributed along the axle core of the body of rod 20; Two 15b of the portion of successively decreasing of four right oil-feed tanks 15 all are circular-arc.
As Fig. 1, Fig. 2 and shown in Figure 3, the quantity that left compensating groove 16 comprises is 6 and circumferentially evenly distributed along the axle core of the body of rod 20.Left side compensating groove 16 comprises and is connected with the logical oil groove 3 in a left side and is buffer part three 16a of vertical bar shape and is positioned at three 16b of the portion of successively decreasing of buffer part three 16a outer ends; Wherein three 16b of the portion of successively decreasing of four left compensating grooves 16 are circular-arc; Three 16b of the portion of successively decreasing of two left compensating grooves 16 are the vertical bar shape in addition, and the area of passage of three 16b of portion that obviously successively decrease is less than the area of passage of buffer part three 16a.
One of them left compensating groove 16 is identical along the structure of another left compensating groove 16 of the axle core symmetry of the body of rod 20 with this left side compensating groove 16; The degree of depth, width and length between above-mentioned three kinds of left compensating grooves 16 is all different; Thus, left compensating groove 16 is divided into three kinds of difformities.
As Fig. 7, Fig. 8 and shown in Figure 9, basic identical with the structure and the principle of above-mentioned left compensating groove 16 as the another kind of structure and the principle of left compensating groove 16, different place is: three 16b of the portion of successively decreasing of six left compensating grooves 16 all are circular-arc.
As Fig. 1, Fig. 2 and shown in Figure 4 reaching as Fig. 7, Fig. 8 and shown in Figure 10, the quantity that left oil-feed tank 17 comprises is 6 and circumferentially evenly distributed along the axle core of the body of rod 20.Left side oil-feed tank 17 comprises and is connected with left oil-feed tank 17 and is buffer part four 17a of vertical bar shape and is positioned at four 17b of the portion of successively decreasing of buffer part four 17a outer ends; Wherein three 16b of the portion of successively decreasing of four left oil-feed tanks 17 are circular-arc; Three 16b of the portion of successively decreasing of two left oil-feed tanks 17 are the vertical bar shape in addition, and the area of passage of four 17b of portion that obviously successively decrease is less than the area of passage of buffer part four 17a.
One of them left oil-feed tank 17 is identical along the structure of another left oil-feed tank 17 of the axle core symmetry of the body of rod 20 with this left side oil-feed tank 17; The degree of depth, width and length between above-mentioned three kinds of left oil-feed tanks 17 is all different; Thus, left oil-feed tank 17 is divided into three kinds of difformities.
Left side compensating groove 16 and left oil-feed tank 17 are formed by three kinds of difform notches, a kind of four 17b of portion that successively decrease in a kind of successively decrease three 16b of portion and the left oil-feed tank 17 in the wherein left compensating groove 16 are the vertical bar shape, this enters the logical oil groove 3 in a left side with less area of passage earlier with regard to making pressure oil, and then enter the logical oil groove 3 in a left side with bigger area of passage, guaranteed the smooth change of control-oil pressure and flow in the commutation process.Simultaneously, successively decrease three 16b of portion and four 17b of portion that successively decrease all have two kinds of respective outer side edges to use, and realize the restriction effect of swing arm rod chamber oil-feed and oil return.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although this paper has used the left limit shaft shoulder 1 morely; The left side external sealed shaft shoulder 2; The logical oil groove 3 in a left side; The sealing shaft shoulder 4 in the left side; The meta left side sealing shaft shoulder 5; The logical oil groove 6 in a meta left side; The meta sealing shaft shoulder 7; The right logical oil groove 8 of meta; The sealing shaft shoulder 9 in right; Right logical oil groove 10; The right external sealed shaft shoulder 11; The right limit shaft shoulder 12; Balancing slit 13; Right compensating groove 14; Buffer part one 14a; One 14b of portion successively decreases; Right oil-feed tank 15; Buffer part 15a; Two 15b of portion successively decrease; Left side compensating groove 16; Buffer part three 16a; Three 16b of portion successively decrease; Left side oil-feed tank 17; Buffer part four 17a; Four 17b of portion successively decrease; The body of rod 20 terms such as grade, but do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present utility model more easily; They are construed to any additional restriction all is contrary with the utility model spirit.
Claims (10)
1. multi-way valve slide valve lever, comprise the body of rod (20) that is shaft-like, the sealing shaft shoulder (9) an end of the body of rod (20) inwardly is followed successively by the right limit shaft shoulder (12), the right external sealed shaft shoulder (11), right logical oil groove (10), the right side from this end face in, it is characterized in that the described right external sealed shaft shoulder (11) is provided with the right compensating groove (14) that communicates with right logical oil groove (10); The sealing shaft shoulder (9) is provided with the right oil-feed tank (15) that communicates with right logical oil groove (10) in right.
2. multi-way valve slide valve lever according to claim 1, it is characterized in that, the other end of the described body of rod (20) inwardly is followed successively by the sealing shaft shoulder (4) in the left limit shaft shoulder (1), the left external sealed shaft shoulder (2), the logical oil groove (3) in a left side, the left side from this end face, and the described left external sealed shaft shoulder (2) is provided with the left compensating groove (16) that communicates with the logical oil groove (3) in a left side; The sealing shaft shoulder (4) is provided with the left oil-feed tank (17) that communicates with the logical oil groove (3) in a left side in the left side.
3. multi-way valve slide valve lever according to claim 2, it is characterized in that, the quantity of described right compensating groove (14), right oil-feed tank (15), left compensating groove (16), left oil-feed tank (17) is 2～10, and described right compensating groove (14), right oil-feed tank (15), left compensating groove (16), left oil-feed tank (17) are all circumferentially evenly distributed along the axle core of the body of rod (20).
4. multi-way valve slide valve lever according to claim 3, it is characterized in that described right compensating groove (14) comprises and is connected with right logical oil groove (10) and is the buffer part one (14a) of vertical bar shape and is positioned at buffer part one (14a) outer end and is the vertical bar shape or is the circular-arc portion of successively decreasing (14b); The area of passage of the described portion one (14b) of successively decreasing is less than the area of passage of buffer part one (14a).
5. according to claim 3 or 4 described multi-way valve slide valve levers, it is characterized in that the quantity of described right compensating groove (14) is even number; And one of them right compensating groove (14) is identical along the structure of another right compensating groove (14) of the axle core symmetry of the body of rod (20) with this right side compensating groove (14).
6. multi-way valve slide valve lever according to claim 3, it is characterized in that described right oil-feed tank (15) comprises and is connected with right oil-feed tank (15) and is the buffer part two (15a) of vertical bar shape and is positioned at buffer part two (15a) outer end and is the vertical bar shape or is the circular-arc portion of successively decreasing two (15b); The area of passage of the described portion two (15b) of successively decreasing is less than the area of passage of buffer part two (15a).
7. according to claim 3 or 6 described multi-way valve slide valve levers, it is characterized in that the quantity of described right oil-feed tank (15) is even number; And one of them right oil-feed tank (15) is identical along the structure of another right oil-feed tank (15) of the axle core symmetry of the body of rod (20) with this right side oil-feed tank (15).
8. multi-way valve slide valve lever according to claim 3, it is characterized in that described left compensating groove (16) comprises and is connected with the logical oil groove (3) in a left side and is the buffer part three (16a) of vertical bar shape and is positioned at buffer part three (16a) outer end and is the vertical bar shape or is the circular-arc portion of successively decreasing three (16b); The area of passage of the described portion three (16b) of successively decreasing is less than the area of passage of buffer part three (16a).
9. according to claim 3 or 8 described multi-way valve slide valve levers, it is characterized in that the quantity of described left compensating groove (16) is even number; And one of them left compensating groove (16) is identical along the structure of another left compensating groove (16) of the axle core symmetry of the body of rod (20) with this left side compensating groove (16).
10. multi-way valve slide valve lever according to claim 3, it is characterized in that described left oil-feed tank (17) comprises and is connected with left oil-feed tank (17) and is the buffer part four (17a) of vertical bar shape and is positioned at buffer part four (17a) outer end and is the vertical bar shape or is the circular-arc portion of successively decreasing four (17b); The area of passage of the described portion four (17b) of successively decreasing is less than the area of passage of buffer part four (17a); The quantity of described left oil-feed tank (17) is even number; And one of them left oil-feed tank (17) is identical along the structure of another left oil-feed tank (17) of the axle core symmetry of the body of rod (20) with this left side oil-feed tank (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202692362U CN201753715U (en) | 2010-07-23 | 2010-07-23 | Slide valve rod used for multi-way valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202692362U CN201753715U (en) | 2010-07-23 | 2010-07-23 | Slide valve rod used for multi-way valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201753715U true CN201753715U (en) | 2011-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202692362U Expired - Lifetime CN201753715U (en) | 2010-07-23 | 2010-07-23 | Slide valve rod used for multi-way valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN201753715U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581563A (en) * | 2012-03-05 | 2012-07-18 | 山东常林机械集团股份有限公司 | Machining process of hydraulic multi-tandem slide valves |
| CN111089090A (en) * | 2019-10-30 | 2020-05-01 | 润琛液压机械南通有限公司 | Manual hydraulic multi-way valve of miniature excavator |
| US11841084B2 (en) | 2020-04-06 | 2023-12-12 | Parker-Hannifin Corporation | Valve spool with flow force mitigation features |
-
2010
- 2010-07-23 CN CN2010202692362U patent/CN201753715U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581563A (en) * | 2012-03-05 | 2012-07-18 | 山东常林机械集团股份有限公司 | Machining process of hydraulic multi-tandem slide valves |
| CN111089090A (en) * | 2019-10-30 | 2020-05-01 | 润琛液压机械南通有限公司 | Manual hydraulic multi-way valve of miniature excavator |
| US11841084B2 (en) | 2020-04-06 | 2023-12-12 | Parker-Hannifin Corporation | Valve spool with flow force mitigation features |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 317604 Zhejiang Taizhou Yuhuan County barley island Street iron faucet Patentee after: Zhejiang Stronger Hydraulic Co., Ltd. Address before: Taizhou City, Zhejiang province 317604 Yuhuan County Chen Yutie leading Patentee before: Zhejiang Stronger Hydraulic Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20110302 |
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| CX01 | Expiry of patent term |