CN105805073B - A kind of plug-in overflow valve main valve that there is orientation to damp - Google Patents
A kind of plug-in overflow valve main valve that there is orientation to damp Download PDFInfo
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- CN105805073B CN105805073B CN201610372904.6A CN201610372904A CN105805073B CN 105805073 B CN105805073 B CN 105805073B CN 201610372904 A CN201610372904 A CN 201610372904A CN 105805073 B CN105805073 B CN 105805073B
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- main valve
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- control chamber
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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
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- Physics & Mathematics (AREA)
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
Abstract
The present invention discloses a kind of plug-in overflow valve main valve that there is orientation to damp.Set on its main valve valve pocket and guide's oil inlet, guide's oil return opening, pilot control hydraulic fluid port and control chamber are set on main valve oil inlet and main valve oil-out, control cover plate；Main valve valve pocket is installed together with control cover plate for sealing, and valve core of main valve is placed in main valve valve pocket and extend into control chamber, and valve core of main valve coordinates with main valve valve pocket gap and main valve sleeve side wall is provided with main valve oil-out；The side that valve core of main valve is always positioned at the part in control chamber is provided with annular groove, orientation damping is set in annular groove, orientation damping includes damping device, damping fin, pin and damping spring, control chamber is divided into upper and lower control chamber by damping fin, the upper surface of damping fin is contacted with the second cell wall of annular groove, and the side of damping fin coordinates with the internal face gap of control chamber.The present invention can reduce pressure overshoot, reduce pressure microsensor, suppress the dither of valve core of main valve, be widely used.
Description
Technical field
The present invention relates to a kind of plug-in overflow valve main valve, the plug type overflow that more particularly to a kind of pressure is high, flow is big
Valve main valve.
Background technology
Overflow valve is a kind of pressure-control valve in hydraulic system, and level pressure overflow and safeguard protection are played in hydraulic system
Effect.In some Large Hydraulic Equipments and hydraulic system, because it is applicable, pressure height, through-current capability are strong, and two-way plug-in overflows
Flow valve and apply quite varied, key position especially in systems, the pressure of the dynamic property of plug-in overflow valve for system
Control is most important.And in plug type overflow valve system, the performance of main valve just has important influence.Therefore, dynamic is developed
The high plug-in overflow valve main valve of performance has important application value.
The content of the invention
It is an object of the invention to provide a kind of plug-in overflow valve main valve that there is orientation to damp, there is valve core of main valve to open for it
The characteristic of the damped coefficients different with having when closing is opened, the fast opening and closing of valve core of main valve is ensure that, pressure overshoot, suppression is reduced
The dither of valve core of main valve processed, reduces pressure microsensor.
For achieving the above object, the technical solution used in the present invention is：The present invention has the inserting of orientation damping
Formula overflow valve main valve includes main valve valve pocket, valve core of main valve, control cover plate, main spool spring, main spool spring seat and orientation damping, described
Cover plate is controlled to be provided with control chamber, the cavity wall of the control chamber is provided with guide's oil inlet, guide's oil return opening and pilot control hydraulic fluid port,
One end of the main valve valve pocket is main valve oil inlet, and the other end of main valve valve pocket is installed together with the control cover plate for sealing,
The main valve valve pocket is placed on outside valve core of main valve, and the valve core of main valve has part to stretch out main valve valve pocket and is located in control chamber, described
Valve core of main valve coordinates with main valve valve pocket gap and the side wall of the main valve valve pocket is provided with main valve oil-out；The main spool spring seat peace
In the control chamber, main spool spring seat is provided with duct, the pilot control hydraulic fluid port and the control chamber company by the duct
It is logical；One end of the main spool spring is installed together with main spool spring seat, and the other end and the valve core of main valve of the main spool spring are pacified
It is fitted together, is left between the main spool spring seat and valve core of main valve and be enough to enable valve core of main valve to do reciprocal fortune in control chamber
Dynamic spacing；The side that the valve core of main valve is always positioned at the part in the control chamber is provided with annular groove, and the annular is recessed
Orientation damping is installed, the orientation damping includes damping device, damping fin, pin and damping spring, the damping device in groove
Side is provided with breach, and the first end face of the damping device is provided with groove, and the second end face of the damping device is arranged on valve core of main valve
Annular groove the first cell wall on, the damping device provided with aperture it is descending along first end face to the direction of second end face
Step through hole；The pin is in ladder shaft-like, and the diameter of the first shaft part of pin is less than the aperture of the macropore of step through hole
And the aperture of the aperture more than step through hole, aperture of the diameter less than the aperture of step through hole of the second shaft part of pin；
The macropore of the step through hole is built-in with the damping spring, and one end of damping spring and the inner face of first shaft part connect
Touch, the other end of damping spring is contacted with the bottom face of the macropore of step through hole；The aperture of step through hole is built-in with described
Second shaft part of pin, the damping spring is placed on outside the second shaft part of pin, when the pin is moved in step through hole
Being capable of compression damping spring；The damping fin is enclosed on outside valve core of main valve and the control chamber is separated into upper control chamber and lower control
Chamber；The upper surface of the damping fin is provided with boss, and the lower surface of the damping fin is outside plane, the first shaft part of the pin
End face is pressed on the lower surface of damping fin, and the boss of the damping fin is contacted with the second cell wall of the annular groove；Institute
The side of damping fin is stated with the internal face gap of the control chamber to coordinate.
Further, master is made provided with sealing ring between the inwall of the outer wall of valve core of main valve of the present invention and main valve valve pocket
Do not connected between valve oil-out and the control chamber.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention is simple in construction, and its valve core of main valve is to main spool spring
There is small damped coefficient during the motion of seat direction, it is ensured that the quick unlatching of main valve oil inlet, effectively pressed at reduction main valve oil inlet
Power overshoot, reduces pressure microsensor；Valve core of main valve has larger damped coefficient when being moved to main valve oil inlet direction, it is ensured that
Main valve oil inlet is steadily closed, it is to avoid the dither of valve core of main valve, and pressure change is steady at main valve oil inlet, and the present invention coordinates
Suitable pressure control pilot valve can obtain the plug-in overflow valve with good dynamic characteristic, therefore the present invention has weight
The application value wanted.
Brief description of the drawings
Fig. 1 is a kind of plug-in overflow valve main valve schematic diagram that there is orientation to damp of the present invention.
Fig. 2 is the enlarged drawing in the A portions in Fig. 1.
Fig. 3 is a kind of structural representation of the main valve valve pocket for the plug-in overflow valve main valve that there is orientation to damp of the present invention.
Fig. 4 is a kind of structural representation of the valve core of main valve for the plug-in overflow valve main valve that there is orientation to damp of the present invention.
Fig. 5 is a kind of structural representation of the damping device for the plug-in overflow valve main valve that there is orientation to damp of the present invention.
Fig. 6 is Fig. 5 B-B full sectional views.
Fig. 7 is a kind of structural representation of the damping fin for the plug-in overflow valve main valve that there is orientation to damp of the present invention.
Fig. 8 is Fig. 7 D-D full sectional views.
Fig. 9 is a kind of structural representation of the pin for the plug-in overflow valve main valve that there is orientation to damp of the present invention.
Figure 10 is a kind of hydraulic schematic diagram for the plug-in overflow valve main valve that there is orientation to damp of the present invention.
1- main valve oil inlets, 2- main valve oil-outs, 3- main valve valve pockets, 4- valve core of main valve, 5- control cover plates, 6- is first
Lead oil inlet, 7- damping devices, 8- damping fins, 9- main spool springs, 10- main spool springs seat, 11- pilot control hydraulic fluid ports, 12-
Pin, 13- damping springs, 14- guide's oil return opening, the sealing rings of 15- the 4th, the sealing rings of 16- the 3rd, 17- second is sealed
Control chamber under circle, the sealing rings of 18- first, the upper control chambers of C1-, C2-, the boss of 30- main valve valve pockets, 31- main valve valve pockets
First shaft shoulder, the inner chamber wall of 32- main valve valve pockets, the outside wall surface of 33- main valve valve pockets, 40- annular grooves, 41- annulars are recessed
First cell wall of groove, the second cell wall of 42- annular grooves, the side of 44- valve core of main valve, the internal face of 51- control chambers, 52-
The accent end of cover plate is controlled, 53- controls the downside of cover plate, 70- step through holes, the macropore of 71- step through holes, 72-
The aperture of step through hole, 73- grooves, the second end face of 74- damping devices, the first end face of 75- damping devices, 76- macropores
Bottom face, the breach of 77- damping devices, the lower surface of 80- damping fins, the boss of 81- damping fins, the side of 83- damping fins
Face, the duct of 101- main spool springs seat, the first shaft part of 120- pins, the second shaft part of 121- pins, 122- first axles
The inner face of section, the outer face of the shaft parts of 123- first.
Embodiment
The present invention is described further with reference to the accompanying drawings and examples.
As shown in Fig. 1-Figure 10, the plug-in overflow valve main valve that the present invention has orientation damping includes main valve valve pocket 3, main valve
Valve element 4, control cover plate 5, main spool spring 9, main spool spring seat 10 and orientation damping.Wherein, as shown in figure 1, control cover plate 5 is provided with
Control chamber, the cavity wall of the control chamber is provided with guide's oil inlet 6, guide's oil return opening 14 and pilot control hydraulic fluid port 11.Main valve valve pocket 3
One end be main valve oil inlet 1, the other end of main valve valve pocket 3 is provided with first shaft shoulder 31；Control accent end 52 and the master of cover plate 5
Valve valve pocket 3 is installed together at first shaft shoulder 31, and the setting the 3rd between main valve valve pocket 3 and the internal face of control chamber 51
Sealing ring 16 so that sealing means are taken in the installation between main valve valve pocket 3 and control cover plate 5, so that the control of control cover plate 5
The inner chamber of chamber and main valve valve pocket 3 is linked to be an entirety；Valve core of main valve 4 is placed in the inner chamber of main valve valve pocket 3 and has part to stretch out main valve
Valve pocket 3, the part of the stretching is located in control chamber；The side wall of main valve valve pocket 3 has been evenly distributed multiple main valve oil-outs 2；It is main
The inner chamber wall 32 of valve valve pocket 3 coordinates with the gap of side 44 of valve core of main valve 4, also, between main valve oil-out 2 and control chamber
Second sealing ring 17 is set, makes not connect between main valve oil-out 2 and control chamber.Main spool spring seat 10 is arranged on control cover plate 5
Control chamber in, main spool spring seat 10 sets duct 101 so that the pilot control hydraulic fluid port 11 that sets and control on control cover plate 5
The control chamber of cover plate 5 is connected by the duct 101, is left between main spool spring seat 10 and valve core of main valve 4 and is enough to make main valve valve
The spacing that core 4 can move reciprocatingly in control chamber；One end of main spool spring 9 is installed together with main spool spring seat 10, main
The other end of valve spring 9 is installed together with valve core of main valve 4, and main spool spring 9 has in main valve oil inlet 1, the and of main valve oil return opening 2
The pre compressed magnitude that main valve oil inlet 1 can be kept to close under the equal no pressure oil condition of pilot control hydraulic fluid port 11.As shown in Figure 1, Figure 2 and figure
Shown in 4, valve core of main valve 4 is always positioned at controlling the side of the part in the control chamber of cover plate 5 to be provided with annular groove 40, the annular
Orientation damping is installed in groove 40.As shown in Fig. 2, Fig. 6, Fig. 8 and Fig. 9, orientation damping includes damping device 7, damping fin 8, pin
Son 12 and damping spring 13.As shown in Fig. 2, Fig. 7, Fig. 8 and Figure 10, the upper surface of damping fin 8 is provided with boss 81, damping fin 8
Lower surface 80 is plane；Damping fin 8 is enclosed on outside valve core of main valve 4；Control chamber is separated into upper control chamber C1 and lower control by damping fin 8
Chamber C2, the side 83 of damping fin 8 coordinates with the gap of internal face 51 of control chamber, and the fit clearance is the first damping R1.At this
During invention work, due to the motion of valve core of main valve 4 and damping fin 8, the boss 81 of damping fin 8 and the second cell wall of annular groove 40
42（That is another side wall of annular groove 40）Position relationship be likely to be at two states：One is the boss 81 and ring of damping fin
Second cell wall of connected in star 40 separates to form gap（I.e. second damping R2）, this state be referred to as the second damping R2 opening；Two be resistance
The boss of Buddhist nun's piece 8 is contacted with the second cell wall 42 of annular groove 40, and the referred to as second damping R2 is closed.Such as Fig. 2, Fig. 5 and Fig. 6 institute
Show, the side of damping device 7 is provided with breach 77, the breach 77 enables damping device 7 to be placed on outside valve core of main valve 4；The first of damping device 7
End face 75 is provided with groove 73, and the second end face 74 of damping device 7 is arranged on the first cell wall 41 of the annular groove 40 of valve core of main valve 4
（That is one of side wall of annular groove 40）On, damping device 7 is provided with aperture along first end face 75 to the direction of second end face 74
Descending step through hole 70.As shown in Fig. 2, Fig. 5, Fig. 6 and Fig. 9, pin 12 is in ladder shaft-like, the first axle of pin 12
The diameter of section 120 is less than the aperture of the aperture of the macropore 71 of step through hole 70 and the aperture 72 more than step through hole 70, pin
The diameter of second shaft part 121 of son 12 is less than the aperture of the aperture 72 of step through hole 70；The macropore 71 of the step through hole 70
Damping spring 13 is built-in with, one end of damping spring 13 is contacted with the inner face 122 of the first shaft part 120 of pin 12, damps bullet
The other end of spring 13 is contacted with the bottom face 76 of the macropore 71 of step through hole 70；The aperture 72 of step through hole 70 is built-in with pin
Second shaft part 121 of son 12, damping spring 13 is placed on outside the second shaft part 121 of pin 12, and pin 12 is in step through hole 70
During motion can compression damping spring 13, damping spring 13 have certain pre compressed magnitude so that the first shaft part 120 of pin 12
Outer face 123 be pressed on the lower surface 80 of damping fin 8, and in upper control chamber C1 identical with lower control chamber C2 pressure at present
Two damping R2 are closed.As shown in figures 1 and 3, the downside 53 of control cover plate 5 is set outside the 4th sealing ring 15, main valve valve pocket 3
First sealing ring 18 is set on wall 33, and the first sealing ring 18 is in the position between main valve oil inlet 1 and main valve oil-out 2.
In the present invention, control chamber is divided into upper control chamber C1 and lower control chamber C2 by orientation damping；When valve core of main valve 4 to
During the 10 directions motion of main spool spring seat, lower control chamber C2 pressure reduction, the out-of-balance force acted on damping fin 8 passes through pin 12
Compression damping spring 13 so that the second damping R2 is opened, now upper to pass through the first damping between control chamber C1 and lower control chamber C2
The damping R2 connections of R1 and second, and the first damping R1 and the second damping R2 are parallel connection；When valve core of main valve 4 is to main valve oil inlet 1
When direction is moved, lower control chamber C2 fluid is compressed, pressure rise so that the second damping R2 is closed, now upper control chamber C1
Only pass through the first damping R1 connections between lower control chamber C2.Therefore, the present invention has the plug-in overflow valve master of orientation damping
The valve core of main valve 4 of valve has different damped coefficients when being moved to main spool spring seat 10 and the both direction of main valve oil inlet 1.
The present invention has the plug-in overflow valve main valve course of work of orientation damping as follows：In guide's control port 11 and master
When valve oil inlet 1 and main valve oil-out 2 non-cut-in pressure are oily, the pre-compression force of the boss 81 of damping fin 8 in damping spring 13
Effect is lower to be contacted with the second cell wall 42 of annular groove 40, and the second damping R2 is closed, and upper control chamber C1 and lower control chamber C2 pass through
First damping R1 connections, upper control chamber C1 and lower control chamber C2 pressure are equal, precommpression of the valve core of main valve 4 in main spool spring 9
Power effect is lower to cause main valve oil inlet 1 to be in safe and reliable closed mode, and this is also that the present invention has the plug-in of orientation damping
The default conditions of overflow valve main valve.Preset pressure passes through pilot control hydraulic fluid port 11 and its main valve bullet by external pilot pressure control valve
Duct 101 on spring abutment 10 gives, and the preset pressure should ensure that all parts of the present invention are not damaged by；When main valve oil inlet 1
When locating pressure more than preset pressure, acting on the out-of-balance force of valve core of main valve 4 makes it be moved to 10 directions of main spool spring seat；Now
Due to the motion of valve core of main valve 4, lower control chamber C2 pressure reduces, and acting on the out-of-balance force of the both sides of damping fin 8 makes it to main valve
The direction of oil inlet 1 is moved and promotes the compression damping spring 13 of pin 12, and the second damping R2 is opened, and upper control chamber C1 pressure oils pass through
First damping R1 and the second damping R2 enter lower control chamber C2, and the motion for valve core of main valve 4 provides low resistance, when valve core of main valve 4
When coming back to stress balance state, pressure stability is in preset pressure, now upper control chamber C1 and lower control at main valve oil inlet 1
Chamber C2 pressure is identical, and the pre-compression force of damping spring 13 closes the second damping R2.In the process, because valve core of main valve 4 is transported
Low resistance during dynamic so that main valve oil inlet 1 is quickly opened, and pressure overshoot is small at this, and pressure microsensor is short.Work as main valve
When pressure is less than preset pressure at oil inlet 1, the out-of-balance force on valve core of main valve 4 makes it be moved to the direction of main valve oil inlet 1, under
Control chamber C2 fluid is compressed, pressure rise so that the second damping R2 is remained off, and lower control chamber C2 fluid passes through first
Control chamber C1 in R1 inflows is damped, the motion for valve core of main valve 4 provides high-damping, when valve core of main valve 4 comes back to stress balance
During state, pressure stability is in preset pressure at main valve oil inlet 1, and now upper control chamber C1 is identical with lower control chamber C2 pressure, resistance
The pre-compression force of Buddhist nun's spring 13 remains turned-off the second damping R2.In the process, due to the height in the motion process of valve core of main valve 4
Damping so that main valve oil inlet 1 is steadily closed, it is to avoid the dither of valve core of main valve 4, makes pressure change at main valve oil inlet 1
Steadily.
Claims (2)
1. a kind of plug-in overflow valve main valve that there is orientation to damp, including main valve valve pocket（3）, valve core of main valve（4）, control cover plate
（5）, main spool spring（9）, main spool spring seat（10）, the control cover plate（5）Provided with control chamber, the main valve valve pocket（3）One
Hold as main valve oil inlet（1）, main valve valve pocket（3）The other end and the control cover plate（5）It is sealingly mounted at together, the main valve
Valve pocket（3）It is placed on valve core of main valve（4）Outside, the valve core of main valve（4）With main valve valve pocket（3）Gap coordinates and the main valve valve pocket
（3）Side wall be provided with main valve oil-out（2）；It is characterized in that：The cavity wall of the control chamber is provided with guide's oil inlet（6）, guide
Oil return opening（14）With pilot control hydraulic fluid port（11）, the valve core of main valve（4）There is part to stretch out main valve valve pocket（3）And positioned at control chamber
It is interior, the main spool spring seat（10）In the control chamber, main spool spring seat（10）It is provided with duct（101）, the elder generation
Lead control port（11）Pass through the duct with control chamber（101）And connect；The main spool spring（9）One end and main spool spring seat
（10）It is installed together, the main spool spring（9）The other end and valve core of main valve（4）It is installed together, the main spool spring seat
（10）With valve core of main valve（4）Between leave and be enough to make valve core of main valve（4）The spacing that can be moved reciprocatingly in control chamber；It is described
Valve core of main valve（4）The side for the part being always positioned in the control chamber is provided with annular groove（40）, the annular groove（40）
Orientation damping is inside installed, the orientation damping includes damping device（7）, damping fin（8）, pin（12）And damping spring（13）,
The damping device（7）Side be provided with breach（77）, the damping device（7）First end face（75）Provided with groove（73）, it is described
Damping device（7）Second end face（74）Installed in valve core of main valve（4）Annular groove（40）The first cell wall（41）On, the resistance
Buddhist nun's seat（7）Provided with aperture along first end face（75）To second end face（74）The descending step through hole in direction（70）；Institute
State pin（12）In ladder shaft-like, pin（12）The first shaft part（120）Diameter be less than step through hole（70）Macropore
（71）Aperture and more than step through hole（70）Aperture（72）Aperture, pin（12）The second shaft part（121）Diameter
Less than step through hole（70）Aperture（72）Aperture；The step through hole（70）Macropore（71）It is built-in with the damping bullet
Spring（13）, damping spring（13）One end and first shaft part（120）Inner face（122）Contact, damping spring（13）'s
The other end and step through hole（70）Macropore（71）Bottom face（76）Contact；Step through hole（70）Aperture（72）It is built-in
There is the pin（12）The second shaft part（121）, the damping spring（13）It is placed on pin（12）The second shaft part（121）Outside,
The pin（12）In step through hole（70）Being capable of compression damping spring during interior motion（13）；The damping fin（8）It is enclosed on master
Valve core（4）The control chamber is separated into upper control chamber outside（C1）With lower control chamber（C2）；The damping fin（8）Upper end
Face is provided with boss（81）, the damping fin（8）Lower surface（80）For plane, the pin（12）The first shaft part（120）'s
Outer face（123）It is pressed in damping fin（8）Lower surface（80）On, the damping fin（8）The boss（81）With the annular
Groove（40）The second cell wall（42）Contact；The damping fin（8）Side（83）With the internal face of the control chamber（51）Between
Gap coordinates.
2. the plug-in overflow valve main valve according to claim 1 that there is orientation to damp, it is characterized in that：The valve core of main valve
（4）Outer wall and main valve valve pocket（3）Inwall between provided with sealing ring and make main valve oil-out（2）Between the control chamber not
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610372904.6A CN105805073B (en) | 2016-05-29 | 2016-05-29 | A kind of plug-in overflow valve main valve that there is orientation to damp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610372904.6A CN105805073B (en) | 2016-05-29 | 2016-05-29 | A kind of plug-in overflow valve main valve that there is orientation to damp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105805073A CN105805073A (en) | 2016-07-27 |
| CN105805073B true CN105805073B (en) | 2017-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610372904.6A Active CN105805073B (en) | 2016-05-29 | 2016-05-29 | A kind of plug-in overflow valve main valve that there is orientation to damp |
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| CN (1) | CN105805073B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594226B (en) * | 2019-09-26 | 2024-06-07 | 山东泰丰智能控制股份有限公司 | Hydraulic damping control structure |
| CN113217497B (en) * | 2021-05-24 | 2023-11-21 | 西安航天远征流体控制股份有限公司 | Plug-in type energy storage overflow valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1587719A (en) * | 2004-08-04 | 2005-03-02 | 浙江大学 | Pilot type pure water overflow valve |
| CN1587718A (en) * | 2004-08-04 | 2005-03-02 | 浙江大学 | Pure water unloading overflow valve |
| CN201526552U (en) * | 2009-09-30 | 2010-07-14 | 浙江大学宁波理工学院 | Plug-in pilot relief valve |
| CN102859204A (en) * | 2010-05-17 | 2013-01-02 | 沃尔沃建造设备有限公司 | Pressure control valve |
| WO2014136649A1 (en) * | 2013-03-07 | 2014-09-12 | 豊興工業株式会社 | Pressure control valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100764119B1 (en) * | 2004-02-25 | 2007-10-08 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Pilot poppet type relief valve |
-
2016
- 2016-05-29 CN CN201610372904.6A patent/CN105805073B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1587719A (en) * | 2004-08-04 | 2005-03-02 | 浙江大学 | Pilot type pure water overflow valve |
| CN1587718A (en) * | 2004-08-04 | 2005-03-02 | 浙江大学 | Pure water unloading overflow valve |
| CN201526552U (en) * | 2009-09-30 | 2010-07-14 | 浙江大学宁波理工学院 | Plug-in pilot relief valve |
| CN102859204A (en) * | 2010-05-17 | 2013-01-02 | 沃尔沃建造设备有限公司 | Pressure control valve |
| WO2014136649A1 (en) * | 2013-03-07 | 2014-09-12 | 豊興工業株式会社 | Pressure control valve |
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| Publication number | Publication date |
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| CN105805073A (en) | 2016-07-27 |
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