CN108061069B - Buffer overflow valve - Google Patents
Buffer overflow valve Download PDFInfo
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- CN108061069B CN108061069B CN201711375273.4A CN201711375273A CN108061069B CN 108061069 B CN108061069 B CN 108061069B CN 201711375273 A CN201711375273 A CN 201711375273A CN 108061069 B CN108061069 B CN 108061069B
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- spring
- valve
- damper piston
- bushing
- valve body
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/029—Counterbalance valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The present invention relates to a kind of buffer overflow valves, the valve body including being provided with auxiliary oil drainage mouth；Valve pocket equipped with pressure oil port and drain tap；Main valve plug；Bushing is supported by the first spring and forms first guide cavity between bushing and main valve plug, the first damping hole is equipped in main valve plug；Damper piston, bushing top form oil back chamber, are provided with third damping hole on damper piston, runner, the first through flow hole are provided in bushing, the first through flow hole is fixed with the first spring base for being provided with the second damping hole, is provided with control oilhole on body wall；Second spring seat, third spring base, back pressure spool, second spring, third spring and the 5th spring, the lower end of second spring seat in damper piston are fixed with the first steel ball, and the bottom of back pressure spool is fixed with the second steel ball；Cushion chamber is formed between adjusting set and damper piston, the top of damper piston is provided with the 4th damping hole.This overflow valve have the advantages that the flow of overflow it is big and can effective shock absorbing pressure, and can realize and conveniently be remotely controlled unloading control.
Description
Technical field
The invention belongs to the technical field of hydraulic valve more particularly to a kind of buffer overflow valves.
Background technique
In the slewing equipment of existing machinery equipment, the hydraulic circuit with pooling feature, such as excavator have been widely applied
Slewing equipment, crane rotation device, high-altitude operation vehicle slewing equipment, manipulator slewing equipment and agriculture and forestry machinery slewing equipment
Deng wherein buffer overflow valve is the key that this kind of system Hydraulic Elements, and the superiority and inferiority of buffer overflow valve performance directly affects host
Performance.Existing buffer overflow valve is divided into board-like buffer overflow valve and two kinds of plug-in buffer overflow valve, In by connection type
In order to reduce installation space in system, system reliability is improved, plug-in buffer overflow valve is generallyd use.As Authorization Notice No. is
" CN 202073860 ", the patent of entitled " threaded plug-in adjustable buffer overflow valve ", discloses a kind of buffer overflow valve,
Including valve pocket, valve seat, spool, spring and damper piston, valve pocket has the first hydraulic fluid port, and valve seat is set to the front end of valve pocket and has
Second hydraulic fluid port, spool are set in valve pocket, and pressure regulation swivel nut has front end inner cavity, set on the rear end of valve pocket and can be moved axially in turn
The axial elastic force of spring can be changed, damper piston includes that the guide part of rear end, the projecting ring section of middle part radial protrusion and front end are axial
The volumetric cylinder portion of opening and the cooperation of spool rear end, the rear end face of projecting ring section are greater than front end face, have among projecting ring section for oil liquid from
Volumetric cylinder portion flows to the interface channel on the outside of rear end, and volumetric cylinder portion, which laterally has, to be flowed to for the calm canister portion inner cavity of oil liquid to volumetric cylinder portion outer wall
Side path.Although background patents can be realized simple buffering relief function, it is had the disadvantage that
It is direct-acting overflow valve, and through-current capability is small, and fever is severe, is not suitable for the slewing equipment of big flow.
It sets up the first stage pressure by Adjusting bolt Adjusting screw, and the pressure of the second hydraulic fluid port rose rapidly to the first stage pressure before this
Overflow, then damper piston again compresses spring by second mouthful of pressure rise to the second stage pressure, although passing through first
The switching of stage pressure and the second stage pressure can be such that slewing equipment slowly starts, but because the damping hole of its valve core inside setting drops
The low opening speed of spool, the first stage pressure equally exists overshoot impact, for the tooth in the slewing equipment of some precisions
Wheel or motor have great danger of burst；If the first stage pressure turned down, it is on the one hand likely to cause the second hydraulic fluid port pressure
Too low, too low first order insufficient pressure is to push damper piston compressed spring, buffer overflow valve disabler, on the other hand this
The structure of invention will be such that the stroke of damper piston shortens, in this way if damper piston can be with compressed spring, the second stage pressure
Reduce the service pressure that slewing equipment is not achieved.
In the invention, no remote control mouth.Some slewing equipments application in, need remotely by automatically controlled button according to
The angle of slewing equipment carries out urgent off-load, and such words the invention needs the unloading electromagnetic valve of big flow in parallel, increases into
This.
In conclusion existing overflow valve can be further improved.
Summary of the invention
The technical problem to be solved by the present invention is to for above-mentioned state of the art and provide a kind of structure it is more reasonable,
The flow of overflow it is big and can effective shock absorbing pressure buffer overflow valve.
The technical scheme of the invention to solve the technical problem is: a kind of buffer overflow valve, including have axial
The valve body of through hole；It with the valve pocket for axially penetrating through hole, is connected in the lower port of valve body, among valve pocket periphery and valve body inner bore
There is the first gap, the lower port of valve pocket forms pressure oil port, is provided with drain tap on valve pocket peripheral wall, is provided on the side wall of valve body and the
The auxiliary oil drainage mouth that one gap communicates is formed with the overflow valve port of connection pressure oil port and drain tap in valve pocket；Main valve plug is set to
Can slide in valve pocket and up and down, outer peripheral surface and overflow the valve port cooperation of main valve plug so that the sliding up and down of main valve plug can open and close it is excessive
Flow valve port；Bushing, upper part are set in valve body and are equipped between valve interior wall sealing ring, and the lower part of bushing is inserted into valve pocket simultaneously
It is equipped with sealing ring between valve sleeving inner wall, the first spring is supported by between bushing and main valve plug, is formed between bushing and main valve plug
First guide cavity, main valve plug is interior to be equipped with the first damping hole for being connected to first guide cavity and pressure oil port；It is characterized by also including have accommodating
The damper piston of chamber can slide in valve body and up and down, and sealing is equipped between the upper periphery and valve interior wall of damper piston
Circle, between the lower, outer perimeter and valve interior wall of damper piston have the second gap, bushing upper end insertion damper piston in and with
Sealing ring is equipped between damper piston inner wall, to form oil back chamber, the side wall of damper piston in the damper piston above bushing
On be provided with the third damping hole of connection oil back chamber and the second gap, the stream in connection the first gap and the second gap is provided in bushing
Road, and the first through flow hole of connection oil back chamber and first guide cavity, the lower end of the first through flow hole is fixed with the first spring base, the first spring
Be provided with the second damping hole for being connected to first guide cavity and the first through flow hole on seat, be provided with control oilhole on body wall, control oilhole by
External solenoid valve control its whether pressure release, bushing be provided with connection control oilhole and the first through flow hole side runner；From bottom to top
Be sequentially arranged in second spring seat, third spring base and the back pressure spool that can be slid in damper piston and up and down, second spring seat and
Second spring is supported by between bushing, the lower end of second spring seat is fixed with the first steel to block first through flow hole
Ball is supported by third spring, the second through flow hole, counterbalance valve is provided on third spring base between second spring seat and third spring base
The 5th spring is held on the top top of core, and the third to be connected to the second through flow hole and the second gap is provided on the side wall of damper piston
Through flow hole, the bottom of back pressure spool are fixed with the second steel ball to block the second through flow hole；Adjusting set is threaded in valve body
Upper end opening at and blocked, be equipped with sealing ring between adjusting set periphery and valve interior wall, adjusting set and damper piston it
Between form cushion chamber, the top of damper piston is provided with the 4th damping hole of connection cushion chamber and oil back chamber.
Background patents are all to use a spring, cannot be too big because valve port opening is limited, so what background patents were set up
First segment pressure be also it is very high, cannot more preferably allow the pressure of control slowly to rise, for this problem, the application is above-mentioned second
The 4th spring is further supported between spring base and third spring base, the 4th spring is located in third spring.In 4th spring is constituted
Coil spring, the purpose of the 4th spring are to allow the third spring as cycle spring to be in drift, and interior coil spring is just opened
The active force for only one very little that begins when such damper piston compressed spring, can slowly increase active force, control
Pressure be also slowly to rise.
To prevent the 5th spring of excessive condensation, the top of above-mentioned damper piston has the T connector portion upwardly extended, adjusting set
Lower end be equipped with the T-slot that hangs for the T connector portion at the top of damper piston.The upper T type head of damper piston and and adjusting set
After offseting, because adjusting set position is fixed, therefore damper piston will not be further continued for moving down under oil pressure effect, effectively prevent delaying
Each spring of piston excessive compression is rushed, plays the role of protecting spring.
To make oil pressure relief see adjusting, the tip male thread of above-mentioned valve body is connected with nut, the upper end of the adjusting set
With thread rod part is adjusted, adjusts thread rod part and be pierced by and be threaded on nut, and in the adjusting screw thread being located at outside nut
Locking nut is threaded in bar portion.
Compared with the prior art, the advantages of the present invention are as follows: this overflow valve has the flow of overflow big and can effectively delay
The advantages of rushing surge, and can realize and conveniently be remotely controlled unloading control.Specifically, the first steel ball and second spring seat are solid
Fixed connection forms pilot valve, and pilot valve is under the action of second spring 8, third spring, four springs in unlatching first
The original state of through flow hole；Back pressure spool and the 5th spring can guarantee that spring cavity has certain return oil pressure, and control port can
To control first guide cavity pressure release or cut-off by external low-flow electromagnetic valve.
Detailed description of the invention
Fig. 1 is the cross-sectional view of the embodiment of the present invention；
Fig. 2 is enlarged drawing at A in Fig. 1；
Fig. 3 is enlarged drawing at the B in Fig. 1；
Fig. 4 is hydraulic schematic diagram of the invention.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
It as shown in Figures 1 to 3, is a preferred embodiment of the present invention.
A kind of buffer overflow valve, including
With the valve body 1 for axially penetrating through hole.
It with the valve pocket 3 for axially penetrating through hole, is connected to by circlip in the lower port of valve body 1,3 periphery of valve pocket and valve body 1
There is the first gap 4a among inner hole, the lower port of valve pocket 3 forms pressure oil port P, is provided with drain tap T1, valve body 1 on 3 peripheral wall of valve pocket
Side wall on be provided with the auxiliary oil drainage mouth T2 communicated with the first gap 4a, connection pressure oil port P and drain tap is formed in valve pocket 3
The overflow valve port 31 of T1.
Main valve plug 2 can slide in valve pocket 3 and up and down, and the outer peripheral surface and overflow valve port 31 of main valve plug 2 cooperate, so that
The sliding up and down of main valve plug 2 can open and close overflow valve port 31.
Bushing 6, upper part are set in valve body 1 and are equipped between 1 inner wall of valve body sealing ring 10, and the lower part of bushing 6 is inserted into
It is equipped with sealing ring 10 in valve pocket 3 and between 3 inner wall of valve pocket, the first spring 5a, bushing 6 are supported by between bushing 6 and main valve plug 2
First guide cavity 21 is formed between main valve plug 2, is equipped with the first damping hole a1 for being connected to first guide cavity 21 and pressure oil port P in main valve plug 2.
Damper piston 8 with accommodating cavity can slide in valve body 1 and up and down, the upper periphery and valve of damper piston 8
It is equipped with sealing ring 10 between 1 inner wall of body, there is the second gap 4b between 1 inner wall of lower, outer perimeter and valve body of damper piston 8, it is described
It is equipped with sealing ring 10 in the upper end insertion damper piston 8 of bushing 6 and between 8 inner wall of damper piston, with slow above bushing 6
It rushes and forms oil back chamber 20 in piston 8, connection oil back chamber 20 and the third damping of the second gap 4b are provided on the side wall of damper piston 8
Hole a3, is provided with the runner 61 of connection the first gap 4a and the second gap 4b in bushing 6, and connection oil back chamber 20 and first guide cavity 21
First through flow hole 62, the lower end of the first through flow hole 62, which is fixed on the first spring base 7a, the first spring base 7a, is provided with connection guide
Second damping hole a2 of chamber 21 and the first through flow hole 62 is provided with control oilhole X on 1 side wall of valve body, controls oilhole X by external electricity
Magnet valve control its whether pressure release, bushing 6 be provided with connection control oilhole X and the first through flow hole 62 side runner 63.
Be sequentially arranged in from bottom to top second spring seat 7b, the third spring base 7c that can be slid in damper piston 8 and up and down and
Back pressure spool 11, is supported by second spring 5b between second spring seat 7b and bushing 6, the lower end fixation of second spring seat 5b is useful
To block the first steel ball 9a of first through flow hole 62, third bullet is supported by between second spring seat 7b and third spring base 7c
Spring 5c and the 4th spring 5d, the 4th spring 5d are located in third spring 5c.It is provided with the second through flow hole 71 on third spring base 7c, carries on the back
The 5th spring 5e is held on the top top of pressure valve core 11, is provided on the side wall of damper piston 8 to be connected to the second through flow hole 71 and the
The third through flow hole 81 of two gap 4a, the bottom of back pressure spool 11 are fixed with the second steel to block second through flow hole 71
Ball 9b.
Adjusting set 12 is threaded at the upper end opening of valve body 1 and is blocked, in 12 periphery of adjusting set and valve body 1
It is equipped with sealing ring 10 between wall, forms cushion chamber 22 between adjusting set 12 and damper piston 8, the top of damper piston 8 is provided with company
4th damping hole a4 of logical cushion chamber 22 and oil back chamber 20.
The top of damper piston 8 has the T connector portion 81 upwardly extended, and the lower end of adjusting set 12 is equipped with for damper piston top
The T-slot 121 that the T connector portion 81 in portion is hung.The tip male thread of valve body 1 is connected with nut 13, and the upper end of adjusting set 12 has
Thread rod part 122 is adjusted, thread rod part 122 is adjusted and is pierced by and is threaded on nut 13, and in the tune being located at outside nut 13
Locking nut 14 is threaded on section thread rod part 122.
The operation principle and process of this overflow valve is as follows:
First steel ball 9a and second spring seat 7b are to be fixedly connected, and form pilot valve, pilot valve second spring 5b,
In the original state for opening the first through flow hole 62 under the action of third spring 5c, the 4th spring 5d；Back pressure spool 11 and the 5th
Spring 5e can guarantee that spring cavity 20 has certain return oil pressure, and control port X can pass through external low-flow electromagnetic valve control
Make first 21 pressure release of guide cavity or cut-off.
In this way when the oil liquid of pressure oil port P flows into, the oil liquid of pressure oil port P is first by the first damping hole a1 to first guide cavity
21, then by the second damping hole a2 through the first through flow hole 62 reach oil back chamber 20, the oil liquid of oil back chamber 20 again by third damping hole a3,
Runner 61, the first gap 4a return auxiliary pressure relief opening T2, and main valve plug 2 is because of the flowing generated between pressure oil port P and first guide cavity 21
Pressure difference is opened, and the oil liquid of pressure oil port P flows into pressure relief opening T, but because third damping hole a3 and back pressure spool via overflow valve port
11 and the 5th spring 5e effect so that oil back chamber 20 is by certain initial pressure (control port X is under off state), this
Initial pressure can compress damper piston 8 and move downward, and the pressure of pressure oil port P is in 8 not downward compressed spring of damper piston
Slightly larger than initial pressure.If the external electrical magnet valve of control port X is in the open state at this time, that is, first guide cavity 21 is let out
Pressure condition, then the oil liquid of first guide cavity 21 can also be via there is control port X to carry out off-load, the pressure base of first guide cavity 21 after side runner 63
This is 0, and main valve plug 2 is all turned on.
If the external electrical magnet valve of control port X is in off state, control port X not will do it off-load, then oil back chamber 20
And the pressure of first guide cavity 21 is essentially the initial pressure that counterbalance valve 11 is determined.The oil liquid of oil back chamber 20 is again by the 4th damping hole a4
Into cushion chamber 22, damper piston 8 gradually moves downward compression pilot valve under the action of initial pressure and upper and lower difference in areas
Core, second spring 5b, third spring 5c, the 4th spring 5d, the pressure of such pressure oil port P can slowly rise, the pressure of rising
Continue to be applied to damper piston 8 makes damper piston 8 continue to move downward above, until damper piston 8 upper T type head 81 with
The T-slot 121 of adjusting set 17 offsets, and the pressure of such pressure oil port P can slowly and finally rise to the work of the setting of adjusting set 12
Make pressure.When the pressure of oil back chamber 20 is more than the pressure of back pressure spool 11, the second steel ball 9b of back pressure spool 11 is moved up, and is opened
Second through flow hole 71, the oil liquid of such oil back chamber 20 is simultaneously through third damping hole a3 and back pressure spool 15, the second through flow hole 71, the
Auxiliary pressure relief opening T2 is returned after threeway discharge orifice 81, the second gap 4b, runner 61 and the first gap 4a.
Therefore the oil pressure of pressure oil port P, gradually rises under initial pressure, is finally reached operating pressure, whole process without
Impact.And because flow mainly passes through main valve plug 2 and carries out overflow, through-current capability is big, generates heat small.
Claims (4)
1. a kind of buffer overflow valve, including
With the valve body (1) for axially penetrating through hole；
It with the valve pocket (3) for axially penetrating through hole, is connected in the lower port of valve body (1), valve pocket (3) periphery and valve body (1) inner hole
Centre has the first gap (4a), and the lower port of valve pocket (3) forms pressure oil port (P), is provided with drain tap on valve pocket (3) peripheral wall
(T1), the auxiliary oil drainage mouth (T2) communicated with the first gap (4a), the company of being formed in valve pocket (3) are provided on the side wall of valve body (1)
The overflow valve port (31) of logical pressure oil port (P) and drain tap (T1)；
Main valve plug (2) is set in valve pocket (3) and can slide up and down, and the outer peripheral surface of main valve plug (2) and overflow valve port (31) cooperate,
So that the sliding up and down of main valve plug (2) can open and close overflow valve port (31)；
Bushing (6), upper part is set in valve body (1) and is equipped with sealing ring (10) between valve body (1) inner wall, under bushing (6)
Portion is inserted into valve pocket (3) and is equipped with sealing ring (10) between valve pocket (3) inner wall, is supported by between bushing (6) and main valve plug (2)
First spring (5a) forms first guide cavity (21), is equipped in main valve plug (2) and is connected to first guide cavity between bushing (6) and main valve plug (2)
(21) and the first damping hole (a1) of pressure oil port (P)；
It is characterized by also including
Damper piston (8) with accommodating cavity, be set to valve body (1) in and can slide up and down, the upper periphery of damper piston (8) and
Sealing ring (10) are equipped between valve body (1) inner wall, have second between the lower, outer perimeter and valve body (1) inner wall of damper piston (8)
Upper end insertion damper piston (8) in gap (4b), the bushing (6) is interior and sealing ring is equipped between damper piston (8) inner wall
(10), to form oil back chamber (20) in the damper piston (8) above bushing (6), connection is provided on the side wall of damper piston (8)
The third damping hole (a3) of oil back chamber (20) and the second gap (4b), bushing (6) is interior to be provided with connection the first gap (4a) and second
The runner (61) in gap (4b), and the first through flow hole (62) of connection oil back chamber (20) and first guide cavity (21), the first through flow hole
(62) lower end is fixed with the first spring base (7a), and the first guide cavity (21) of connection and the first through flow hole are provided on the first spring base (7a)
(62) the second damping hole (a2) is provided with control oilhole (X) on valve body (1) side wall, controls oilhole (X) by external solenoid valve control
Make its whether pressure release, bushing (6) be provided with connection control oilhole (X) and the first through flow hole (62) side runner (63)；
It is sequentially arranged in second spring seat (7b), the third spring base (7c) that can be slid in damper piston (8) and up and down from bottom to top
With back pressure spool (11), it is supported by between second spring seat (7b) and bushing (6) second spring (5b), second spring seat (5b)
Lower end is fixed with the first steel ball (9a) to block first through flow hole (62), second spring seat (7b) and third spring base
It is supported by third spring (5c), is provided on third spring base (7c) the second through flow hole (71) between (7c), back pressure spool (11)
The 5th spring (5e) is held on top top, is provided on the side wall of damper piston (8) to be connected between the second through flow hole (71) and second
The third through flow hole (81) of gap (4a), the bottom of back pressure spool (11) be fixed with to block second through flow hole (71)
Two steel balls (9b)；
Adjusting set (12), is threaded at the upper end opening of valve body (1) and is blocked, adjusting set (12) periphery and valve body
(1) sealing ring (10) are equipped between inner wall, form cushion chamber (22) between adjusting set (12) and damper piston (8), damper piston
(8) top is provided with the 4th damping hole (a4) of connection cushion chamber (22) and oil back chamber (20).
2. buffer overflow valve according to claim 1, it is characterised in that: the second spring seat (7b) and third spring base
The 4th spring (5d) is further supported between (7c), the 4th spring (5d) is located in third spring (5c).
3. buffer overflow valve according to claim 1, it is characterised in that: the top of the damper piston (8) has upward
The T connector portion (81) of extension, the lower end of adjusting set (12) are equipped with the T-slot hung for the T connector portion (81) at the top of damper piston
(121)。
4. buffer overflow valve according to claim 1, it is characterised in that: the tip male thread of the valve body (1) is connected with
Nut (13), the upper end of the adjusting set (12), which has, adjusts thread rod part (122), adjusts thread rod part (122) and is pierced by simultaneously spiral shell
Line is connected on nut (13), and is threaded with locking nut on being located at the adjusting thread rod part (122) of nut (13) outside
(14)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711375273.4A CN108061069B (en) | 2017-12-19 | 2017-12-19 | Buffer overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711375273.4A CN108061069B (en) | 2017-12-19 | 2017-12-19 | Buffer overflow valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108061069A CN108061069A (en) | 2018-05-22 |
| CN108061069B true CN108061069B (en) | 2019-11-15 |
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ID=62139552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711375273.4A Active CN108061069B (en) | 2017-12-19 | 2017-12-19 | Buffer overflow valve |
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| Country | Link |
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| CN (1) | CN108061069B (en) |
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| CN108953709B (en) * | 2018-09-27 | 2019-08-23 | 上海江浪科技股份有限公司 | A kind of unloading valve |
| CN109026887B (en) * | 2018-10-17 | 2020-05-19 | 菏泽百特工程机械有限公司 | Buffer valve |
| CN109185253B (en) * | 2018-10-22 | 2020-04-21 | 杭州诚臻工程机械有限公司 | Electromagnetic overflow valve |
| CN110259751A (en) * | 2019-07-15 | 2019-09-20 | 宁波克泰液压有限公司 | Threaded insertion pilot is pressurized second level overflow valve |
| CN111660439B (en) * | 2020-06-16 | 2022-06-24 | 邵立坤 | Motor control device for concrete mixer truck |
| CN113638932A (en) * | 2021-07-29 | 2021-11-12 | 中国人民解放军海军工程大学 | Hydraulic control impact load transmitting valve |
| CN114278636B (en) * | 2021-12-29 | 2024-08-16 | 潍柴动力股份有限公司 | Hydraulic system and second-order buffering overflow valve device thereof |
| CN118443557B (en) * | 2024-07-05 | 2024-09-03 | 四川省第六地质大队 | Expansion water stop plug device for pressurized water test |
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| DE10221077B4 (en) * | 2002-05-11 | 2005-03-17 | Horst Kleibrink | Spring-loaded oil overflow valve for membrane compressors |
| DE102006021926B4 (en) * | 2006-05-11 | 2011-12-01 | Gerhard Götze KG | overflow |
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- 2017-12-19 CN CN201711375273.4A patent/CN108061069B/en active Active
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| CN108061069A (en) | 2018-05-22 |
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