CN203394912U - Built-in pressure feedback control integrated valve - Google Patents
Built-in pressure feedback control integrated valve Download PDFInfo
- Publication number
- CN203394912U CN203394912U CN201320445602.9U CN201320445602U CN203394912U CN 203394912 U CN203394912 U CN 203394912U CN 201320445602 U CN201320445602 U CN 201320445602U CN 203394912 U CN203394912 U CN 203394912U
- Authority
- CN
- China
- Prior art keywords
- valve
- port
- hydraulic
- built
- pressure feedback
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model discloses a built-in pressure feedback control integrated valve which comprises a valve body, a first overflow valve, a second overflow valve, a driving reversing slide valve and a hydraulic-control check valve. The valve body is provided with a hydraulic oil inlet, a hydraulic oil return port and an external connecting oil port, and the first overflow valve, the second overflow valve, the driving reversing slide valve and the hydraulic-control check valve are arranged on the valve body and are communicated with the hydraulic oil inlet; the driving reversing slide valve is provided with a first oil inlet, a second oil inlet, an oil return port, a first working oil port and a second working oil port; the first working oil port is communicated with a control oil port of the first overflow valve via a throttle valve, and the second working oil port is communicated with a control oil port of the second overflow valve. The built-in pressure feedback control integrated valve has the advantages that the integrated valve is simple in structure, small in size, low in cost, energy consumption and heat productivity, quick in action and good in reliability, is light and can be used with oil cylinders, and pressure can be stably outputted by the aid of the built-in pressure feedback control integrated valve.
Description
Technical field
The utility model relates to hydrovalve technical field, relates in particular a kind of built-in pressure feedback control integration valve.
Background technique
China First tractor many decades that is born till now, China's tractor industry is through continuous development and adjust, and has formed large, medium and small engaging, wherein, in take, small tractor is main production system; Main supporting hydraulic parts as tractor, also experienced from copying self-developing, from small lot to production in enormous quantities, developing stage from from a few kind to many kinds, but, itself and external new and high technology tractor hydraulic part compare, and still have larger gap, and the suspension system of tractor is all the more so.
Tractor is in work, need suspension system to place the instruments such as plough, and then by tractor, drive plough to wait to carry out work, in the process operating, need suspension system to drive plough to wait and rise to precalculated position, then rest on this position and carry out work, after work, fall again, the lifting of existing tractor suspension system and stop, rely on mechanical mechanism to carry out completely, its complex structure, volume are large, operation inconvenience, and the position stopping is limited, can not meet peasant's demand.
Model utility content
The purpose of this utility model is to provide for the deficiencies in the prior art part, a kind of built-in pressure feedback control integration valve is provided, can overcome the deficiencies in the prior art part, it is simple in structure, volume is little, lightweight, cheap, energy consumption is low, heating value is few, can be used in conjunction with oil cylinder, can realize Output pressure steadily, be active in one's movements, good reliability.
In order to solve the problems of the technologies described above, the technical solution of the utility model is as follows: built-in pressure feedback control integration valve, comprise there is hydraulic oil import, hydraulic oil is answered back and the outside valve body that connects hydraulic fluid port, be located on described valve body and the first relief valve communicating with described hydraulic oil import, be located on described valve body and the second relief valve communicating with described hydraulic oil import, be arranged on the active reversing slide valve on described valve body and be located at and be connected with described outside the Pilot operated check valve that hydraulic fluid port is connected on described valve body; Described active reversing slide valve has that the first filler opening communicating with described hydraulic oil import communicates with described hydraulic oil import and is connected with the second filler opening of described the first filler opening parallel connection and the described hydraulic oil return opening communicating of answering back the first actuator port, the second actuator port that hydraulic fluid port communicates with described outside; Described the first actuator port is connected by the control port of throttle valve and described the first relief valve, and the control port of described the second actuator port and described the second relief valve is connected.
Integrated valve of the present utility model, two relief valves, active reversing slide valve, Pilot operated check valve are integrated on a valve body, volume is little, level of integration is high, cheap, energy consumption is low, heating value is few, can be arranged on lifter box house, be convenient to very much install, the existence of two constant difference overflow valves make delivery pressure steadily, be active in one's movements, good reliability.
As preferably, described active reversing slide valve lifting position, pressurize position and lowering position, when described active reversing slide valve is positioned at lifting position, described the first filler opening and described the first actuator port communicate and described the second actuator port and described return opening communicate; When described active reversing slide valve is positioned at pressurize position, described the second filler opening and described the second actuator port communicate; When described active reversing slide valve is positioned at lowering position, described the second filler opening and described the second actuator port communicate and described the first filler opening is that described the first actuator port communicates.
As preferably, described the first actuator port is connected hydraulic fluid port by the one-way valve with described throttle valve parallel connection with described outside and is connected.
As preferably, described active reversing slide valve comprises that one end stretches out the valve core rod of described valve body, is fixed on described valve core rod end and stretches out the Stroke Control plunger of described valve body and be sleeved on the Compress Spring on described valve core rod and between described Stroke Control plunger and described valve body, described valve core rod be provided with first radially casing coupling, second radially casing coupling, be arranged on the described first the first fluid hole, the second fluid hole and the 3rd fluid hole in casing coupling radially, described the first fluid hole, the second fluid hole and the 3rd fluid hole are connected by axial auxiliary hole.
As preferably, described the second relief valve comprise the overflow spool that is arranged in described valve body overflow spool bore, be screwed onto the fastening plug screw of described overflow spool hole end surface and be arranged on described overflow spool and described fastening plug screw between relief valve spring, described overflow spool is provided with axial stomidium, described relief valve spring one end is arranged in described axial stomidium, and described overflow spool is provided with the radially damping hole communicating with described axial stomidium.
As preferably, described overflow spool is provided with radially annular groove, described in described radially damping hole is arranged on radially in annular groove.
As preferably, described Pilot operated check valve comprises the hydraulic control valve pocket with sealing valve port, the fastening swivel nut that is fixed on described Pilot operated check valve bore ends that arrange in described valve body fluid-control one-way valve opening, be arranged on hydraulic control spool in described hydraulic control valve pocket, be located at hydraulic control spring between described hydraulic control spool and described fastening swivel nut and for adjusting the hydraulic control push rod of described hydraulic control spool position in described hydraulic control valve pocket.
As preferably, described hydraulic control spool comprises the 3rd transition axis that the second transition axis that first axis of guide that the projecting shaft matching with described hydraulic control spring is connected with described projecting shaft and the seal valve seat that matches with described sealing valve port is connected with described seal valve seat First Transition axle is connected with described First Transition axle is connected with described first axis of guide is connected with described second axis of guide and the 3rd axis of guide being connected with described the 3rd transition axis.
As preferably, described throttle valve is throttle hole.
As preferably, described throttle bore dia is 1mm.
The utility model beneficial effect is:
It is simple in structure, volume is little, lightweight, cheap, energy consumption is low, heating value is few, can be used in conjunction with oil cylinder, can realize Output pressure steadily, be active in one's movements, good reliability; Idle time, can realize the off-load of system, the pressure and the load that in work, guarantee output balance each other, not only promote the reliability of whole suspension system and the stationarity of work, also reduced heating, saved energy consumption, in addition, Pilot operated check valve is manual pattern, can by manually-operable, realize the unpowered decline of suspension system, has further reduced cost, save the energy, reduced heating.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described further:
Fig. 1 is embodiment's of the present utility model structural representation;
Fig. 2 is plan view in Fig. 1;
Fig. 3 is A-A sectional view in Fig. 1;
Fig. 4 is B-B sectional view in Fig. 1;
Fig. 5 is valve core rod structural drawing in the utility model;
Fig. 6 is C-C sectional view in Fig. 1;
Fig. 7 is the utility model hydraulic schematic diagram.
In figure:
1-valve body, the import of 101-hydraulic oil, 102-hydraulic oil is answered back, the outside hydraulic fluid port that connects of 103-;
2-the first relief valve;
3-throttle valve;
4-is reversing slide valve initiatively, 401-valve core rod, 402-Stroke Control plunger, 403-Compress Spring, 40101-first is casing coupling radially, and 40102-second is casing coupling radially, the axial auxiliary hole of 40103-, 40104-the first fluid hole, 40105-the second fluid hole, 40106-the 3rd fluid hole;
5-the second relief valve, 501-overflow spool, the fastening plug screw of 502-, 503-relief valve spring, the axial stomidium of 50101-, 50102-is damping hole radially, and 50103-is annular groove radially;
6-Pilot operated check valve, 601-hydraulic control valve pocket, the fastening swivel nut of 602-, 603-hydraulic control spool, 604-hydraulic control spring, 605-hydraulic control push rod, 60301-projecting shaft, 60302-seal valve seat, 60303-First Transition axle, 60304-first axis of guide, 60305-the second transition axis, 60306-second axis of guide, 60307-the 3rd transition axis, 60308-the 3rd axis of guide;
7-one-way valve.
Embodiment
The following stated is only preferred embodiment of the present utility model, not scope of the present utility model is limited.
Embodiment, see accompanying drawing 1,2,3,4,5,6,7, built-in pressure feedback control integration valve, comprise there is hydraulic oil import 101, hydraulic oil answers back 102 and the outside valve body 1 that connects hydraulic fluid port 103, be located on described valve body 1 and the first relief valve 2 communicating with described hydraulic oil import 101, be located on described valve body 1 and the second relief valve 5 communicating with described hydraulic oil import 101, be arranged on the active reversing slide valve 4 on described valve body 1 and be located at and be connected with described outside the Pilot operated check valve 6 that hydraulic fluid port 103 is connected on described valve body 1, the first relief valve and the second relief valve are all built-in relief valves, be arranged in valve body, certainly, also can adopt finished parts, be arranged on valve body, but relative like this volume ratio is larger, initiatively selector valve 4 is manual guiding valve, lifting position SH, pressurize position BA and lowering position XA, described active reversing slide valve 4 has the first oil inlet P 1 communicating with described hydraulic oil import 101, communicate with described hydraulic oil import 101 and and the second oil inlet P 2 of described the first oil inlet P 1 parallel connection, with described hydraulic oil 102 oil return inlet T that communicate of answering back, be connected the first actuator port A that hydraulic fluid port 103 communicates with described outside, the second actuator port B, described the first actuator port A is connected by the control port K1 of throttle valve 3 and described the first relief valve 2, and the control port K2 of described the second actuator port B and described the second relief valve 5 is connected, simultaneously, in valve body, be also provided with outside and be connected the one-way valve 7 that hydraulic fluid port 103 is connected, this one-way valve and throttle valve 3 parallel connections, prevent in needs pressurize, and the outside hydraulic oil that connects hydraulic fluid port 103 flows backwards, in the present embodiment, what throttle valve 3 adopted is throttle hole, simple in structure, easy to process, effective, the diameter in throttle hole is 1.0mm.
Initiatively the initial position of reversing slide valve 4 is lifting position, and when described active reversing slide valve 4 is positioned at lifting position, described the first oil inlet P 1 and described the first actuator port A communicate and described the second actuator port B and described oil return inlet T communicate, this time, the second relief valve 5 is equivalent to safety valve, and a part of hydraulic oil enters the control port K1 of the first relief valve 2 after by throttle valve 3, the existence of throttle valve 3, making from hydraulic oil out of the first actuator port A and arriving between the hydraulic oil of control port K1 has individual pressure reduction, this setting, guaranteed to enter outside the stable of hydraulic fluid port 103 hydraulic fluid pressures that connect from the first actuator port A, because once pressure surpasses predetermined numerical value, hydraulic oil can open the first relief valve by liquefaction mouth K1, carry out overflow step-down, when described active reversing slide valve 4 is positioned at pressurize position, described the second oil inlet P 2 and described the second actuator port B communicate, the first oil inlet P 1 and described the first actuator port A do not communicate, this time, the control port K2 by the second relief valve 5 made the second relief valve in unloading condition, system pressure is very little, heating is few, energy-conserving and environment-protective, when described active reversing slide valve 4 is positioned at lowering position, described the second oil inlet P 2 and described the second actuator port B communicate and described the first oil inlet P 1 is that described the first actuator port A communicates, now the first relief valve and the second relief valve, all in unloading condition, rely on manually operated Pilot operated check valve to realize the oil return of oil cylinder.
In the present embodiment, described active reversing slide valve 4 comprises that one end stretches out the valve core rod 401 of described valve body 1, be fixed on described valve core rod 401 ends and stretch out the Stroke Control plunger 402 of described valve body 1 and be sleeved on the Compress Spring 403 on described valve core rod 401 and between described Stroke Control plunger 402 and described valve body 1, Compress Spring 403 one end act on valve body 1, the other end acts in Stroke Control plunger, when External Force Acting is in Stroke Control plunger, Compress Spring 403 pressurizeds shrink, valve core rod 401 is to the interior movement of valve body 1, arrive successively pressurize position and lowering position, on described valve core rod 401, be provided with the first casing coupling 40101, second casing coupling 40102 radially radially, described first, radially in casing coupling 40101, be provided with the first fluid hole 40104, simultaneously, on valve core rod 401, be also provided with the second fluid hole 40105 and the 3rd fluid hole 40106, described the first fluid hole 40104, the second fluid hole 40105 and the 3rd fluid hole 40106 are connected by axial auxiliary hole 40103, and axially the end of auxiliary hole 40103 is lived by the plug for seal of Stroke Control plunger.
And described the second relief valve 5 comprises the overflow spool 501 in the overflow spool bore that is arranged on described valve body 1, be screwed onto the fastening plug screw 502 of described overflow spool hole end surface and be arranged on described overflow spool 501 and described fastening plug screw 502 between relief valve spring 503, described overflow spool 501 is provided with axial stomidium 50101, described relief valve spring 503 one end are arranged in described axial stomidium 50101, the other end is arranged in the end-face hole of fastening plug screw 502, relief valve spring can be positioned, in the time of pressurized, be not offset, described overflow spool 501 is provided with the radially damping hole 50102 communicating with described axial stomidium 50101, damping hole diameter 1-2mm radially, simultaneously, described overflow spool 501 is provided with radially annular groove 50103, described in described radially damping hole 50102 is arranged on radially in annular groove 50103.
In the present embodiment, Pilot operated check valve 6 is hand control valve, described Pilot operated check valve 6 comprises the hydraulic control valve pocket 601 with sealing valve port arranging in described valve body 1 fluid-control one-way valve opening, be fixed on the fastening swivel nut 602 of described Pilot operated check valve bore ends, be arranged on the hydraulic control spool 603 in described hydraulic control valve pocket 601, be located at hydraulic control spring 604 between described hydraulic control spool 603 and described fastening swivel nut 602 and for adjusting described hydraulic control spool 603 at the hydraulic control push rod 605 of described hydraulic control valve pocket 601Nei position, hydraulic control spool 603 and sealing valve port match, hydraulic control spring 604 both can be regarded Returnning spring, hydraulic control spool can also be pressed on sealing valve port, guarantee sealing, hydraulic control spool 603 during by operation hydraulic control push rod 604 leaves sealing valve port, realize the unlatching of Pilot operated check valve, further, described hydraulic control spool 603 comprises the projecting shaft 60301 matching with described hydraulic control spring 604, be connected with described projecting shaft 60301 and and the seal valve seat 60302 that matches of described sealing valve port, the First Transition axle 60303 being connected with described seal valve seat 60302, first axis of guide 60304 being connected with described First Transition axle 60303, the second transition axis 60305 being connected with described first axis of guide 60304 and second axis of guide 60306 being connected with described the second transition axis 60305, on described second axis of guide 60306, be connected with the 3rd transition axis 60307, and the 3rd transition axis 60307 is connected with the 3rd axis of guide 60308.
More than explanation is only to explanation of the present utility model, make those of ordinary skills' can completely implement this programme, but be not to restriction of the present utility model, those skilled in the art can make to the present embodiment the modification that there is no creative contribution as required after reading this specification, and these are all not creative modifications.But as long as within the scope of claim of the present utility model, be all subject to the protection of Patent Law.
Claims (10)
1. built-in pressure feedback control integration valve, it is characterized in that: comprise and there is hydraulic oil import (101), hydraulic oil is answered back (102) and the outside valve body (1) that connects hydraulic fluid port (103), be located at described valve body (1) upper and and the first relief valve (2) of communicating of described hydraulic oil import (101), be located at described valve body (1) upper and and the second relief valve (5) of communicating of described hydraulic oil import (101), be arranged on the active reversing slide valve (4) on described valve body (1) and be located at and be connected the Pilot operated check valve (6) that hydraulic fluid port (103) is connected with described outside on described valve body (1), the return opening (T) that described active reversing slide valve (4) has that the first filler opening (P1) communicating with described hydraulic oil import (101) communicates with described hydraulic oil import (101) and second filler opening (P2) in parallel with described the first filler opening (P1) and described hydraulic oil are answered back (102) communicates is connected the first actuator port (A), the second actuator port (B) that hydraulic fluid port (103) communicates with described outside, described the first actuator port (A) is connected by the control port (K1) of throttle valve (3) and described the first relief valve (2), and the control port (K2) of described the second actuator port (B) and described the second relief valve (3) is connected.
2. built-in pressure feedback control integration valve according to claim 1, it is characterized in that: described active reversing slide valve (4) lifting position, pressurize position and lowering position, when described active reversing slide valve (4) is positioned at lifting position, described the first filler opening (P1) and described the first actuator port (A) communicate and described the second actuator port (B) and described return opening (T) communicate; When described active reversing slide valve (4) is positioned at pressurize position, described the second filler opening (P2) and described the second actuator port (B) communicate; When described active reversing slide valve (4) is positioned at lowering position, described the second filler opening (P2) and described the second actuator port (B) communicate and described the first filler opening (P1) is that described the first actuator port (A) communicates.
3. built-in pressure feedback control integration valve according to claim 1, is characterized in that: described the first actuator port (A) is connected by being connected hydraulic fluid port (103) with described throttle valve (3) one-way valve (7) in parallel with described outside.
4. built-in pressure feedback control integration valve according to claim 1, it is characterized in that: described active reversing slide valve (4) comprises that one end stretches out the valve core rod of described valve body (1) (401), be fixed on described valve core rod (401) end and stretch out the Stroke Control plunger (402) of described valve body (1) and be sleeved on described valve core rod (401) and be positioned at the Compress Spring (403) between described Stroke Control plunger (402) and described valve body (1), described valve core rod (401) is provided with the first casing coupling (40101) radially, the second casing coupling (40102) radially, be arranged on described first the first fluid hole (40104) in casing coupling (40101) radially, the second fluid hole (40105) and the 3rd fluid hole (40106), described the first fluid hole (40104), the second fluid hole (40105) and the 3rd fluid hole (40106) are connected by axial auxiliary hole (40103).
5. built-in pressure feedback control integration valve according to claim 1, it is characterized in that: described the second relief valve (5) comprises the overflow spool (501) being arranged in described valve body (1) overflow spool bore, be screwed onto the fastening plug screw (502) of described overflow spool hole end surface and be arranged on described overflow spool (501) and described fastening plug screw (502) between relief valve spring (503), described overflow spool (501) is provided with axial stomidium (50101), described relief valve spring (503) one end is arranged in described axial stomidium (50101), described overflow spool (501) is provided with the radially damping hole (50102) communicating with described axial stomidium (50101).
6. built-in pressure feedback control integration valve according to claim 5, is characterized in that: described overflow spool (501) is provided with radially annular groove (50103), described in described radially damping hole (50102) is arranged on radially in annular groove (50103).
7. built-in pressure feedback control integration valve according to claim 6, it is characterized in that: described Pilot operated check valve (6) comprises the hydraulic control valve pocket (601) with sealing valve port arranging in described valve body (1) fluid-control one-way valve opening, be fixed on the fastening swivel nut (602) of described Pilot operated check valve bore ends, be arranged on the hydraulic control spool (603) in described hydraulic control valve pocket (601), be located at hydraulic control spring (604) between described hydraulic control spool (603) and described fastening swivel nut (602) and for adjusting the hydraulic control push rod (605) of described hydraulic control spool (603) position in described hydraulic control valve pocket (601).
8. built-in pressure feedback control integration valve according to claim 7, it is characterized in that: described hydraulic control spool (603) comprises the projecting shaft (60301) matching with described hydraulic control spring (604), be connected with described projecting shaft (60301) and and the seal valve seat (60302) that matches of described sealing valve port, the First Transition axle (60303) being connected with described seal valve seat (60302), first axis of guide (60304) being connected with described First Transition axle (60303), the second transition axis (60305) being connected with described first axis of guide (60304), second axis of guide (60306) being connected with described the second transition axis (60305), the 3rd transition axis (60307) being connected with described second axis of guide and the 3rd axis of guide (60308) being connected with described the 3rd transition axis (60307).
9. according to the built-in pressure feedback control integration valve described in claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8, it is characterized in that: described throttle valve (3) is throttle hole.
10. built-in pressure feedback control integration valve according to claim 9, is characterized in that: described throttle bore dia is 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320445602.9U CN203394912U (en) | 2013-07-25 | 2013-07-25 | Built-in pressure feedback control integrated valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320445602.9U CN203394912U (en) | 2013-07-25 | 2013-07-25 | Built-in pressure feedback control integrated valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203394912U true CN203394912U (en) | 2014-01-15 |
Family
ID=49906447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320445602.9U Expired - Fee Related CN203394912U (en) | 2013-07-25 | 2013-07-25 | Built-in pressure feedback control integrated valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203394912U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707680A (en) * | 2018-12-24 | 2019-05-03 | 燕山大学 | Compound automatic diverter valve |
-
2013
- 2013-07-25 CN CN201320445602.9U patent/CN203394912U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707680A (en) * | 2018-12-24 | 2019-05-03 | 燕山大学 | Compound automatic diverter valve |
| CN109707680B (en) * | 2018-12-24 | 2019-11-05 | 燕山大学 | Compound automatic diverter valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201180705Y (en) | High-pressure high-volume hydraulic loop device | |
| CN202901414U (en) | Novel pressure release valve | |
| CN205401290U (en) | Energy storage ware return circuit is with guide's off -load overflow valve | |
| CN103899596B (en) | A kind of hydraulic lock of band guide's check valve | |
| CN204253479U (en) | The omnidistance electric-controlled type hydrovalve of reaper | |
| CN203394912U (en) | Built-in pressure feedback control integrated valve | |
| CN202510447U (en) | Flow regulating valve | |
| CN201909095U (en) | Electro-hydraulic linkage actuating mechanism | |
| CN203796643U (en) | Adjustable throttling hydraulic lock of coal mining machine | |
| CN204677346U (en) | The electromechanical combined formula high pressure oil pump of normal close type | |
| CN203051267U (en) | Hydraulic system provided with two-stage priority structure and used for tractor | |
| CN201301205Y (en) | Control loop for descending of fork of industrial vehicle | |
| WO2022143357A1 (en) | Bidirectional speed-adjustment hydraulic valve group | |
| CN202580167U (en) | Novel electrically controlled relief valve | |
| CN201687709U (en) | Energy-saving inverse proportion valve | |
| CN204704187U (en) | Overload unloading valve | |
| CN202012095U (en) | Movable arm hydraulic energy saving control device for loading machine | |
| CN202251184U (en) | Control cover plate with pressure reduction function | |
| CN103541942B (en) | Be applicable to the bidirectional control valve of short-wall coal-winning machine height-adjusting system | |
| CN205001135U (en) | Variable control piston of volume adjustable hydraulic pump, motor and hydraulic pump, motor | |
| CN219529970U (en) | Control device of hydraulic valve | |
| CN210106282U (en) | Load feedback pressure compensation pilot valve | |
| CN201568390U (en) | Electric-control stop valve | |
| CN203926176U (en) | Integrated hydraulic hoists | |
| CN220622311U (en) | Hydraulic control reversing valve group with adjustable pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140115 Termination date: 20210725 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |