CN203272299U - Double-pump two-way confluence multiple directional control valve - Google Patents
Double-pump two-way confluence multiple directional control valve Download PDFInfo
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- CN203272299U CN203272299U CN 201320127700 CN201320127700U CN203272299U CN 203272299 U CN203272299 U CN 203272299U CN 201320127700 CN201320127700 CN 201320127700 CN 201320127700 U CN201320127700 U CN 201320127700U CN 203272299 U CN203272299 U CN 203272299U
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Abstract
The utility model discloses a double-pump two-way confluence multiple directional control valve, consisting of a rotation oil inlet valve plate 1, a rotation valve plate 2, a PC oil inlet valve plate 3, a flexible valve plate 4, an amplitude variation valve plate 5, a PC valve plate 6, a subsidiary hoist valve plate 7, a main hoist valve plate 8 and an oil inlet valve plate 9 which are connected in sequence, wherein the valve bodies are integrated into a valve block and are connected through oil lines which are formed by casting; an oil outlet P5' of the amplitude variation valve plate 5 is connected with an oil inlet P6 of the PC valve plate 6. As the oil outlet P5' of the amplitude variation valve plate 5 is connected with the oil inlet P6 of the PC valve plate 6, the PC valve plate can realize double-pump confluence oil supply with the flexible valve plate and the amplitude variation valve plate, the action speed of flexible and amplitude-variable oil cylinders is greatly quickened, the system action is rapid, and the working efficiency is high.
Description
Technical field
The utility model relates to a kind of double pump two-way interflow multiple directional control valve.
Background technique
The crane hydraulic system generally adopts the unidirectional converging system of double pump at present, collaborates fuel feeding to realize double pump to the elevator valve block, improves the rotating speed of hoist motor, thereby increases work efficiency.This system is made of revolution oil-feed valve block, revolution valve block, PC oil-feed valve block, flexible valve block, luffing valve block, secondary elevator valve block, master winch valve block, oil-feed valve block, wherein PC oil-feed valve block is to flexible valve block and luffing valve block fuel feeding, the oil-feed valve block is to secondary elevator valve block and master winch valve block fuel feeding, be provided with one-way valve between luffing valve block and secondary elevator valve block, PC oil-feed valve block can collaborate fuel feeding to major-minor elevator valve block by this one-way valve.
Because only allowing PC oil-feed valve block, one-way valve collaborates to major-minor elevator valve block direction, do not allow the oil-feed valve block to collaborate to flexible and luffing valve block, flexible and luffing valve block can only by single oil pump feed, so just limit the movement speed of flexible and amplitude oil cylinder, cause system acting slower, the used time is longer.
Summary of the invention
The technical problems to be solved in the utility model is to provide and a kind ofly guarantees that system acting is rapid, and is consuming time short, the double pump of high working efficiency two-way interflow multiple directional control valve.
The utility model is achieved in that
the two-way interflow of a kind of double pump multiple directional control valve, it is by the revolution oil-feed valve block 1 that is connected successively, revolution valve block 2, PC oil-feed valve block 3, flexible valve block 4, luffing valve block 5, PC valve block 6, secondary elevator valve block 7, master winch valve block 8, oil-feed valve block 9 forms, each valve block is integrated into a valve piece, and connect by the oil circuit that is located in the valve piece, its special way is: the oil outlet P1 ' of revolution oil-feed valve block 1 is connected with the oil inlet P 2 of revolution valve block 2, the oil outlet P3 ' of PC oil-feed valve block 3 is connected with the oil inlet P 4 of flexible valve block 4, the oil outlet P4 ' of flexible valve block 4 is connected with the oil inlet P 5 of luffing valve block 5, the oil outlet P5 ' of luffing valve block 5 is connected with PC valve block 6 oil inlet P 6, the oil outlet P10 ' of oil-feed valve block 9 is connected with the oil inlet P 9 of master winch valve block 8, the oil outlet P9 ' of master winch valve block 8 is connected with the oil inlet P 8 of secondary elevator valve block 7, the oil outlet P8 ' of secondary elevator valve block 7 is connected with the oil inlet P 7 of PC valve block 6, the oil return inlet T 3 of PC oil-feed valve block 3 is connected with the oil return inlet T 9 of oil-feed valve block 9.
Described revolution oil-feed valve block 1 is comprised of with the relief valve Y1 that is arranged on revolution oil-feed valve body 101 revolution oil-feed valve body 101, described revolution oil-feed valve body 101 is provided with oil inlet P 1, oil outlet P1 ', oil return inlet T 1, the filler opening of relief valve Y1 is connected with oil inlet P 1, and the return opening of relief valve Y1 is connected with oil return inlet T 1.
Described revolution valve block 2 is placed in the revolution valve rod 202 in rotary valve body 201 by rotary valve body 201, is placed in respectively front valve bonnet 203, the rear valve bonnet 204 at rotary valve body 201 two ends, is placed in successively the Returnning spring 205 in front valve bonnet 203, and spring seat 206 forms; Described rotary valve body 201 is provided with oil inlet P 2, actuator port A1, actuator port B1, oil return inlet T 2.
Described PC oil-feed valve block 3 is by revolution oil-feed valve body 301, and the relief valve Y2, the three-way pressure compensating device 302 that are placed in respectively revolution oil-feed valve body both sides form; Described revolution oil-feed valve body 301 is provided with oil inlet P 3, oil outlet P3 ', oil return inlet T 3; The filler opening of relief valve Y2 is connected with oil inlet P 3, and the return opening of relief valve Y1 is connected with oil return inlet T 2, and the oil outlet of three-way pressure compensating device 302 is connected with oil return inlet T 3.
Described flexible valve block 4 is placed in the flexible valve rod 402 in flexible valve body 401 by flexible valve body 401, is placed in the front valve bonnet 403 at flexible valve body 402 two ends, rear valve bonnet 404, and the Returnning spring 405 and the spring seat 406 that are placed in front valve bonnet 403 form; Described flexible valve body 401 is provided with oil inlet P 4, oil outlet P4 ', actuator port A2, actuator port B2, oil return inlet T 4.
Described luffing valve block 5 is by luffing valve body 501, be placed in the luffing valve rod 502 in luffing valve body 501, be placed in front valve bonnet 503, the rear valve bonnet 504 of luffing valve body 501 both sides, be placed in Returnning spring 505 and spring seat 506 in front valve bonnet 503, the shuttle valve 507 that is placed on luffing valve rod 502 forms; Described luffing valve body 501 is provided with oil inlet P 5, oil outlet P5 ', actuator port A3, actuator port B3, oil return inlet T 5.
Described PC valve block 6 is by PC valve body 601, be positioned at PC valve body and the first interflow valve rod 602 of arranging up and down, the second interflow valve rod 603, be placed in interflow bar front shroud 604, the interflow bar back cover 605 of PC valve body 601 both sides, be placed in the first one-way valve 606 on PC valve body 601 circumferential side wall, the second one-way valve 607, and the three-way pressure compensating device 608 that is positioned on PC valve body 601 end faces forms; Be provided with oil inlet P 6 and oil inlet P 7 on PC valve body 601.
Described secondary elevator valve block 7 is located at the secondary elevator valve rod 702 in secondary elevator valve body 701 by secondary elevator valve body 701, is located at front valve bonnet 703 and the rear valve bonnet 704 at secondary elevator valve body 701 two ends, and the Returnning spring 705 and the spring seat 706 that are located in front valve bonnet 703 form; Described secondary elevator valve body is provided with oil inlet P 8, oil outlet P8 ', actuator port A4, actuator port B4, oil return inlet T 7.
Described master winch valve block 8 is by master winch valve body 801, be located at the master winch valve rod 802 in master winch valve body 801, be located at front valve bonnet 803 and the rear valve bonnet 804 at master winch valve body 801 two ends, be located at Returnning spring 805 and spring seat 806 in front valve bonnet 803, the shuttle valve 807 that is located on master winch valve rod 802 forms; Be provided with oil inlet P 9 on the master winch valve body, oil outlet P9 ', actuator port A5, actuator port B5 and oil return inlet T 8.
Described oil-feed valve block 9 is comprised of oil-feed valve body 901 and relief valve Y3, and described oil-feed valve body 901 is provided with oil inlet P 10, hydraulic fluid port P5 ', oil return inlet T 9, and wherein relief valve Y3 filler opening is connected with oil inlet P 10, and relief valve Y3 oil outlet is connected with oil return inlet T 9.
The beneficial effects of the utility model are:
Because the oil outlet P5 ' of luffing valve block 5 is connected with PC valve block 6 oil inlet P 6, the PC valve block can realize with to flexible valve block and luffing valve block Dual-pump flow-converging fuel feeding, greatly accelerated the movement speed of flexible and amplitude oil cylinder, system acting is rapid, high working efficiency.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is connection diagram of the present utility model;
Fig. 3 is the structural representation of revolution oil-feed valve block in Fig. 1;
Fig. 4 is the structural representation of revolution valve block in Fig. 1;
Fig. 5 is the structural representation of PC oil-feed valve block in Fig. 1;
Fig. 6 is the structural representation of flexible valve block in Fig. 1;
Fig. 7 is the structural representation of luffing valve block in Fig. 1;
Fig. 8 is the structural representation of PC valve block in Fig. 1;
Fig. 9 is the structural representation of secondary elevator valve block in Fig. 1;
Figure 10 is the structural representation of master winch valve block in Fig. 1;
Figure 11 is the structural representation of oil-feed valve block in Fig. 1.
in figure: revolution oil-feed valve block 1, revolution oil-feed valve body 101, revolution valve block 2, rotary valve body 201, revolution valve rod 202, front valve bonnet 203, rear valve bonnet 204, Returnning spring 205, spring seat 206, PC oil-feed valve block 3, revolution oil-feed valve body 301, three-way pressure compensating device 302, flexible valve block 4, flexible valve body 401, flexible valve rod 402, front valve bonnet 403, rear valve bonnet 404, Returnning spring 405, spring seat 406, luffing valve block 5, luffing valve body 501, luffing valve rod 502, front valve bonnet 503, rear valve bonnet 504, Returnning spring 505, spring seat 506, shuttle valve 507, PC valve block 6, PC valve body 601, the first interflow valve rod 602, the second interflow valve rod 603, interflow bar front shroud 604, interflow bar back cover 605, the first one-way valve 606, the second one-way valve 607, three-way pressure compensating device 608, secondary elevator valve block 7, secondary elevator valve body 701, secondary elevator valve rod 702, front valve bonnet 703, rear valve bonnet 704, Returnning spring 705, spring seat 706, master winch valve block 8, master winch valve body 801, master winch valve rod 802, front valve bonnet 803, rear valve bonnet 804, Returnning spring 805, spring seat 80, shuttle valve 807, oil-feed valve block 9, oil-feed valve body 901.
Embodiment
as Fig. 1, shown in Figure 2, the two-way interflow of this double pump multiple directional control valve is by the revolution oil-feed valve block 1 that is connected successively, revolution valve block 2, PC oil-feed valve block 3, flexible valve block 4, luffing valve block 5, PC valve block 6, secondary elevator valve block 7, master winch valve block 8, oil-feed valve block 9 forms, each valve block is integrated into a valve piece, and connect by the oil circuit that is located in the valve piece, its special way is: the oil outlet P1 ' of revolution oil-feed valve block 1 is connected with the oil inlet P 2 of revolution valve block 2, the oil outlet P3 ' of PC oil-feed valve block 3 is connected with the oil inlet P 4 of flexible valve block 4, the oil outlet P4 ' of flexible valve block 4 is connected with the oil inlet P 5 of luffing valve block 5, the oil outlet P5 ' of luffing valve block 5 is connected with PC valve block 6 oil inlet P 6, the oil outlet P10 ' of oil-feed valve block 9 is connected with the oil inlet P 9 of master winch valve block 8, the oil outlet P9 ' of master winch valve block 8 is connected with the oil inlet P 8 of secondary elevator valve block 7, the oil outlet P8 ' of secondary elevator valve block 7 is connected with the oil inlet P 7 of PC valve block 6, the oil return inlet T 3 of PC oil-feed valve block 3 is connected with the oil return inlet T 9 of oil-feed valve block 9.
As shown in Figure 3, described revolution oil-feed valve block 1 is comprised of with the relief valve Y1 that is arranged on revolution oil-feed valve body 101 revolution oil-feed valve body 101, described revolution oil-feed valve body 101 is provided with oil inlet P 1, oil outlet P1 ', oil return inlet T 1, the filler opening of relief valve Y1 is connected with oil inlet P 1, and the return opening of relief valve Y1 is connected with oil return inlet T 1.
As shown in Figure 4, described revolution valve block 2 is placed in the revolution valve rod 202 in rotary valve body 201 by rotary valve body 201, is placed in respectively front valve bonnet 203, the rear valve bonnet 204 at rotary valve body 201 two ends, be placed in successively the Returnning spring 205 in front valve bonnet 203, spring seat 206 forms; Described rotary valve body 201 is provided with oil inlet P 2, actuator port A1, actuator port B1, oil return inlet T 2.
As shown in Figure 5, described PC oil-feed valve block 3 is by revolution oil-feed valve body 301, and the relief valve Y2, the three-way pressure compensating device 302 that are placed in respectively revolution oil-feed valve body both sides form; Described revolution oil-feed valve body 301 is provided with oil inlet P 3, oil outlet P3 ', oil return inlet T 3; The filler opening of relief valve Y2 is connected with oil inlet P 3, and the return opening of relief valve Y1 is connected with oil return inlet T 2, and the oil outlet of three-way pressure compensating device 302 is connected with oil return inlet T 3.
As shown in Figure 6, described flexible valve block 4 is placed in the flexible valve rod 402 in flexible valve body 401 by flexible valve body 401, is placed in the front valve bonnet 403 at flexible valve body 402 two ends, rear valve bonnet 404, and the Returnning spring 405 and the spring seat 406 that are placed in front valve bonnet 403 form; Described flexible valve body 401 is provided with oil inlet P 4, oil outlet P4 ', actuator port A2, actuator port B2, oil return inlet T 4.
As shown in Figure 7, described luffing valve block 5 is by luffing valve body 501, be placed in the luffing valve rod 502 in luffing valve body 501, be placed in front valve bonnet 503, the rear valve bonnet 504 of luffing valve body 501 both sides, be placed in Returnning spring 505 and spring seat 506 in front valve bonnet 503, the shuttle valve 507 that is placed on luffing valve rod 502 forms; Described luffing valve body 501 is provided with oil inlet P 5, oil outlet P5 ' actuator port A3, actuator port B3, oil return inlet T 5.
As shown in Figure 8, described PC valve block 6 is by PC valve body 601, be positioned at PC valve body and the first interflow valve rod 602 of arranging up and down, the second interflow valve rod 603, be placed in interflow bar front shroud 604, the interflow bar back cover 605 of PC valve body 601 both sides, be placed in the first one-way valve 606 on PC valve body 601 circumferential side wall, the second one-way valve 607, and the three-way pressure compensating device 608 that is positioned on PC valve body 601 end faces forms; Be provided with oil inlet P 6 and oil inlet P 7 on PC valve body 601.
As shown in Figure 9, described secondary elevator valve block 7 is by secondary elevator valve body 701, be located at the secondary elevator valve rod 702 in secondary elevator valve body 701, be located at front valve bonnet 703 and the rear valve bonnet 704 at secondary elevator valve body 701 two ends, the Returnning spring 705 and the spring seat 706 that are located in front valve bonnet 703 form; Described secondary elevator valve body is provided with oil inlet P 8, oil outlet P8 ' actuator port A4, actuator port B4, oil return inlet T 7.
As shown in figure 10, described master winch valve block 8 is by master winch valve body 801, be located at the master winch valve rod 802 in master winch valve body 801, be located at front valve bonnet 803 and the rear valve bonnet 804 at master winch valve body 801 two ends, be located at Returnning spring 805 and spring seat 806 in front valve bonnet 803, the shuttle valve 807 that is located on master winch valve rod 802 forms; Be provided with oil inlet P 9 on the master winch valve body, oil outlet P9 ', actuator port A5, actuator port B5 and oil return inlet T 8.
As shown in figure 11, described oil-feed valve block 9 is comprised of oil-feed valve body 901 and relief valve Y3, described oil-feed valve body 901 is provided with oil inlet P 10, hydraulic fluid port P5 ', oil return inlet T 9, and wherein relief valve Y3 filler opening is connected with oil inlet P 10, and relief valve Y3 oil outlet is connected with oil return inlet T 9.
Claims (10)
1. double pump two-way interflow multiple directional control valve, it is by the revolution oil-feed valve block that is connected successively, the revolution valve block, PC oil-feed valve block, flexible valve block, the luffing valve block, the PC valve block, secondary elevator valve block, master winch valve block and oil-feed valve block form, each valve block is integrated into a valve piece, and connect by the oil circuit that is located in the valve piece, it is characterized in that: the oil outlet P1 ' of revolution oil-feed valve block is connected with the oil inlet P 2 of revolution valve block, the oil outlet P3 ' of PC oil-feed valve block is connected with the oil inlet P 4 of flexible valve block, the oil outlet P4 ' of flexible valve block is connected with the oil inlet P 5 of luffing valve block, the oil outlet P5 ' of luffing valve block is connected with PC valve block oil inlet P 6, the oil outlet P10 ' of oil-feed valve block is connected with the oil inlet P 9 of master winch valve block, the oil outlet P9 ' of master winch valve block is connected with the oil inlet P 8 of secondary elevator valve block, the oil outlet P8 ' of secondary elevator valve block is connected with the oil inlet P 7 of PC valve block, the oil return inlet T 3 of PC oil-feed valve block is connected with the oil return inlet T 9 of oil-feed valve block.
2. the two-way interflow of double pump according to claim 1 multiple directional control valve, it is characterized in that: described revolution oil-feed valve block is comprised of with the relief valve Y1 that is arranged on revolution oil-feed valve body revolution oil-feed valve body, described revolution oil-feed valve body is provided with oil inlet P 1, oil outlet P1 ' and oil return inlet T 1, the filler opening of relief valve Y1 is connected with oil inlet P 1, and the return opening of relief valve Y1 is connected with oil return inlet T 1.
3. the two-way interflow of double pump according to claim 1 multiple directional control valve is characterized in that: described revolution valve block by rotary valve body, be placed in revolution valve rod in rotary valve body, the front valve bonnet that is placed in respectively rotary valve body two ends and rear valve bonnet, the Returnning spring and the spring seat that are placed in front valve bonnet successively form; Described rotary valve body is provided with oil inlet P 2, actuator port A1, actuator port B1 and oil return inlet T 2.
4. the two-way interflow of double pump according to claim 1 multiple directional control valve is characterized in that: described PC oil-feed valve block by revolution oil-feed valve body, the relief valve Y2 and the three-way pressure compensating device that are placed in respectively revolution oil-feed valve body both sides form; Described revolution oil-feed valve body is provided with oil inlet P 3, oil outlet P3 ' and oil return inlet T 3; The filler opening of relief valve Y2 is connected with oil inlet P 3, and the return opening of relief valve Y1 is connected with oil return inlet T 2, and the oil outlet of three-way pressure compensating device is connected with oil return inlet T 3.
5. the two-way interflow of double pump according to claim 1 multiple directional control valve is characterized in that: described flexible valve block by flexible valve body, be placed in the flexible valve rod in flexible valve body, the front valve bonnet, the rear valve bonnet that are placed in flexible valve body two ends, Returnning spring and the spring seat that is placed in front valve bonnet and form; Described flexible valve body is provided with oil inlet P 4, oil outlet P4 ', actuator port A2, actuator port B2 and oil return inlet T 4.
6. the two-way interflow of double pump according to claim 1 multiple directional control valve is characterized in that: described luffing valve block by the luffing valve body, be placed in the luffing valve rod in the luffing valve body, the front valve bonnet that is placed in luffing valve body both sides, rear valve bonnet, be placed in Returnning spring and the spring seat in front valve bonnet and the shuttle valve that is placed on the luffing valve rod forms; Described luffing valve body is provided with oil inlet P 5, oil outlet P5 ', actuator port A3, actuator port B3 and oil return inlet T 5.
7. the two-way interflow of double pump according to claim 1 multiple directional control valve is characterized in that: described PC valve block by the PC valve body, be positioned at PC valve body and the first interflow valve rod of arranging up and down, the second interflow valve rod, the interflow bar front shroud that is placed in PC valve body both sides, interflow bar back cover, be placed in the first one-way valve and the second one-way valve on PC valve body circumferential side wall and the three-way pressure compensating device that is positioned on PC valve body end face forms; Be provided with oil inlet P 6 and oil inlet P 7 on the PC valve body.
8. the two-way interflow of double pump according to claim 1 multiple directional control valve is characterized in that: described secondary elevator valve block 7 by secondary elevator valve body, be located at the secondary elevator valve rod in secondary elevator valve body, the front valve bonnet and the rear valve bonnet that are located at secondary elevator valve body two ends, Returnning spring and the spring seat that is located in front valve bonnet and form; Described secondary elevator valve body is provided with oil inlet P 8, oil outlet P8 ', actuator port A4, actuator port B4 and oil return inlet T 7.
9. the two-way interflow of double pump according to claim 1 multiple directional control valve is characterized in that: described master winch valve block by the master winch valve body, be located at master winch valve rod in the master winch valve body, be located at master winch valve body two ends front valve bonnet and rear valve bonnet, be located at Returnning spring and the spring seat in front valve bonnet and the shuttle valve that is located on the master winch valve rod forms; Be provided with oil inlet P 9, oil outlet P9 ', actuator port A5, actuator port B5 and oil return inlet T 8 on the master winch valve body.
10. the two-way interflow of double pump according to claim 1 multiple directional control valve, it is characterized in that: described oil-feed valve block is comprised of oil-feed valve body and relief valve Y3, described oil-feed valve body is provided with oil inlet P 10, hydraulic fluid port P5 ' and oil return inlet T 9, wherein relief valve Y3 filler opening is connected with oil inlet P 10, and relief valve Y3 oil outlet is connected with oil return inlet T 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320127700 CN203272299U (en) | 2013-03-20 | 2013-03-20 | Double-pump two-way confluence multiple directional control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320127700 CN203272299U (en) | 2013-03-20 | 2013-03-20 | Double-pump two-way confluence multiple directional control valve |
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| Publication Number | Publication Date |
|---|---|
| CN203272299U true CN203272299U (en) | 2013-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320127700 Withdrawn - After Issue CN203272299U (en) | 2013-03-20 | 2013-03-20 | Double-pump two-way confluence multiple directional control valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN203272299U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148039A (en) * | 2013-03-20 | 2013-06-12 | 锦州市力特缸泵阀液压制造有限公司 | Dual-pump two-way converging multi-tandem direction valve |
| CN106678103A (en) * | 2015-11-06 | 2017-05-17 | 中国航空工业第六八研究所 | Novel big-arm flow collecting valve |
| CN109114254A (en) * | 2018-09-19 | 2019-01-01 | 合肥长源液压股份有限公司 | A kind of valve group to work in series and parallel for high-low pump and multi-way valve |
| CN110848194A (en) * | 2019-11-21 | 2020-02-28 | 徐州天睿地机械有限公司 | Externally-connected converging valve for mobile hydraulic power station |
-
2013
- 2013-03-20 CN CN 201320127700 patent/CN203272299U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148039A (en) * | 2013-03-20 | 2013-06-12 | 锦州市力特缸泵阀液压制造有限公司 | Dual-pump two-way converging multi-tandem direction valve |
| CN103148039B (en) * | 2013-03-20 | 2015-09-23 | 锦州市力特缸泵阀液压制造有限公司 | Double pump two-way interflow multiple directional control valve |
| CN106678103A (en) * | 2015-11-06 | 2017-05-17 | 中国航空工业第六八研究所 | Novel big-arm flow collecting valve |
| CN109114254A (en) * | 2018-09-19 | 2019-01-01 | 合肥长源液压股份有限公司 | A kind of valve group to work in series and parallel for high-low pump and multi-way valve |
| CN109114254B (en) * | 2018-09-19 | 2024-01-19 | 合肥长源液压股份有限公司 | Valve group and multi-way valve for serial-parallel operation of high-pressure pump and low-pressure pump |
| CN110848194A (en) * | 2019-11-21 | 2020-02-28 | 徐州天睿地机械有限公司 | Externally-connected converging valve for mobile hydraulic power station |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131106 Effective date of abandoning: 20150923 |
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| RGAV | Abandon patent right to avoid regrant |