CN201475070U - Cartridge balance valve - Google Patents
Cartridge balance valve Download PDFInfo
- Publication number
- CN201475070U CN201475070U CN2009201927993U CN200920192799U CN201475070U CN 201475070 U CN201475070 U CN 201475070U CN 2009201927993 U CN2009201927993 U CN 2009201927993U CN 200920192799 U CN200920192799 U CN 200920192799U CN 201475070 U CN201475070 U CN 201475070U
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- valve
- valve core
- valve body
- balance
- spring
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Abstract
The utility model relates to a cartridge balance valve comprising a valve body, a check valve core and a balance valve core, wherein a first oil port, a second oil port and a third oil port are arranged on the valve body; the check valve core is arranged at the second oil part and is supported by a first spring to be in axial upward movement; the balance valve core is arranged in the valve body and can be matched with a valve port of the check valve core; a second spring is arranged in a spring chamber of the valve body; the upper part in the balance valve core is provided with an axial channel and a first damping hole; an annular shoulder is arranged in the middle position of the balance valve core; an annular notch is arranged on the lower circumference of the annular shoulder; an inner wall of the valve body is provided with an annular inner shoulder blade; an oil inlet chamber is formed among the annular notch, the inner wall of the valve body and the annular inner shoulder blade; and the third oil port is communicated with the oil inlet chamber through a second damping hole on the side wall of the valve body. The balance valve core and the check valve core adopt an integrated structure, the structure is simple, the balance valve core and the check valve core are independent on the relative position relationship, the assembly is convenient, and the heat treatment requirement and the material requirement of the balance valve core are reduced.
Description
Technical field
The utility model belongs to the technical field of valve, especially refers to a kind of cartridge balanced valve that is applicable in the heavy-duty lifting machine shear leg telescopic oil cylinder loop.
Background technique
In machinery such as the engineering machinery in modern times, building machinery, widely applied the oil hydraulic circuit that hoists, wherein equilibrium valve is the crucial hydraulic element of this type systematic, the quality of equilibrium valve performance directly affects the performance of main frame.Existing equilibrium valve is divided into two kinds of board-like equilibrium valve and cartridge balanced valves by Placement, in order to reduce installing space, improves system reliability in the crane telescopic oil cylinder, generally adopts cartridge balanced valve.
As a patent No. is a kind of equilibrium valve the Chinese invention patent " a kind of equilibrium valve " of ZL01139273.8 (notification number is CN1133821C) has disclosed, comprise main valve, pilot valve, wherein main valve comprises valve pocket, main valve plug, the outer side surface of described valve pocket is provided with main hydraulic fluid port and main hydraulic fluid port, described pilot valve is positioned at main valve plug, guide's spool is connected with the pilot valve spring, and above-mentioned each valve all comprises two chambeies that are positioned at the spool front and back, and it is characterized in that: (1) described valve pocket is cylindrical shell; (2) a plurality of springs that main spool spring is respectively left-handed and dextrorotation, mutually nested and rigidity differs are formed, and main valve plug links to each other with valve pocket by a plurality of springs; (3) be provided with control valve plug in the end face of described valve pocket, this control valve plug and main valve plug offset and can move vertically in valve pocket, damping hole and the back cavity of hydraulic fluid port connection pilot valve and the ante-chamber of main valve of mutual perforation axially and radially located to be provided with respectively in the control valve plug middle part, and control valve plug end and pilot valve spring offset; (4) described main valve plug upper forepart radially, radially be respectively equipped with hydraulic fluid port on guide's spool and be communicated with the back cavity and the main hydraulic fluid port of pilot valve; On main valve plug, be parallel to and be axially arranged with back cavity and the main hydraulic fluid port that damping hole is communicated with main valve; (6) rear portion radially is provided with ante-chamber and the main hydraulic fluid port that a hydraulic fluid port is communicated with pilot valve on described main valve plug.
But there is following shortcoming in this scheme:
1, complex structure, coaxality requires to reach more than six places between the part, and the gap, place that is slidingly matched is minimum, and the technology manufacture difficulty is big, and spool blocks easily during the actual use of product, causes to the main frame reliability to have a strong impact on.
2, because guide's spool (nonreturn valve core) is located at main valve plug (balance valve core) inside, balance valve core again with the wired seal request of valve pocket, this heat treatment and material to balance valve core has proposed very high request, will there be very high hardness at balance valve core conical surface place on the one hand, balance valve core and nonreturn valve core cooperation place hardness are low again on the other hand, have increased processing cost undoubtedly.
3, because of nonreturn valve core is located at balance valve core inside, in order to reduce flow resistance, certainly will increase the size of nonreturn valve core, the size of balance valve core and valve pocket also can become greatly in succession, makes the overall dimensions of valve bigger than normal, has caused difficulty for the processing of plug-in opening.
4, diameter unanimity about the valve pocket causes the seal ring breakage easily during installation, thereby produces internal leakage, causes a hidden trouble for Host Security.
5, the internally-damped link of valve is few, and poor stability under ambient conditions is disturbed is easy to generate shake.
In sum, existing cartridge balanced valve structure also can be further improved
The model utility content
Technical problem to be solved in the utility model is that a kind of simple in structure, low cost of manufacture, cartridge balanced valve that the stability of a system is high are provided at above-mentioned prior art present situation.
The utility model solves the problems of the technologies described above the technological scheme that is adopted: a kind of cartridge balanced valve, it is characterized in that: this equilibrium valve includes valve body, have first hydraulic fluid port and second hydraulic fluid port that communicate with each other on the valve body, also have the 3rd hydraulic fluid port on the valve body, described first hydraulic fluid port and the 3rd hydraulic fluid port are positioned on the body wall, and described second hydraulic fluid port then is positioned on the valve body lower end face; Nonreturn valve core is located at described second oil port and axially slippage up and down of valve body relatively, and this nonreturn valve core is held with retainer shaft by first spring and upwards moves trend; Balance valve core, be installed on medium position and axially slippage up and down of valve body relatively in the valve body, the bottom of balance valve core can cooperate to block being communicated with of first hydraulic fluid port and second hydraulic fluid port with the valve port of described nonreturn valve core, the upper-end surface of balance valve core and the upper space of valve body form spring chamber, be provided with one in this spring chamber and make the balance valve core retainer shaft to moving down and second spring of the trend of shutoff nonreturn valve core valve port, second spring to the elastic force of balance valve core greater than the elastic force of first spring to nonreturn valve core; Top in the balance valve core has the axial passage that is communicated with described spring chamber, and the bottom in the balance valve core has first damping hole of the valve port that is communicated with axial passage and nonreturn valve core; The medium position place of balance valve core has annular convex shoulder, seal by seal ring between this annular convex shoulder and the valve interior wall, have an annular breach on the bottom side face of annular convex shoulder, omoplate in valve interior wall has annular, balance valve core and should annular in seal by seal ring between the omoplate, form oil suction chamber between the omoplate in described annular breach and valve interior wall and the annular, described the 3rd hydraulic fluid port is communicated with this oil suction chamber by second damping hole on the body wall.
For making this equilibrium valve have better Security, above-mentioned on annular convex shoulder top the balance valve core outer circumferential face and the inner peripheral surface of valve body between be provided with a valve pocket, be provided with the seal ring sealing between valve pocket and the balance valve core, be provided with the seal ring sealing between valve pocket and the valve interior wall, described spring chamber is positioned at valve pocket top, constitute chamber between valve pocket lower end surface and described annular convex shoulder and the valve interior wall, have the duct that is communicated with this chamber on the body wall, the upper-end surface of balance valve core has the forced section that contracts in the diameter and raise up, this force part is in described spring chamber, and the area of forced section upper-end surface is less than the area of the lower end surface of balance valve core.
Like this when cause load to increase because of outside cause, when surpassing the safety pressure of default, because the area of forced section upper-end surface is less than the area of the lower end surface of balance valve core, pretend the hydraulic coupling difference that is used in the balance valve core upper and lower end face and just can overcome the effect of second spring, with balance valve core upwards the top from the valve port of nonreturn valve core, the pressure of second hydraulic fluid port overload is discharged,, pin again then until safety pressure.
Above-mentioned valve body upper end open, this opening internal thread is connected with an adjustment sleeve, the cavity of adjustment sleeve and the upper-end surface of balance valve core form described spring chamber, also be provided with a spring seat in this spring chamber, the upper-end surface of adjustment sleeve is fixed with an adjusting nut, one adjusting screw is threaded in this adjusting nut and passes adjustment sleeve, this adjusting screw is conflicted with the spring seat upper-end surface after entering spring chamber, the upper end of described second spring and spring seat are conflicted, and conflict in the lower end of second spring and balance valve core upper-end surface.
This structure moves up and down and drive spring seat, and then regulates the preload pressure of second spring, with the peaked effect of the safety pressure that reaches initialization system by rotating adjusting screw
The profile of above-mentioned valve body is the multidiameter shaft shape.Can effectively protect seal ring when making this equilibrium valve pack valve opening into like this.
Compared with prior art, advantage of the present utility model is:
1, balance valve core, nonreturn valve core adopt integral structure, and be simple in structure, reduces cost, and balance valve core and nonreturn valve core are relatively more independent, easy to assembly on relative position relation, reduces the heat treatment requirements of balance valve core simultaneously and to the material requirement of balance valve core.
2, balance valve core and nonreturn valve core spool valve seat has each other reduced the flow resistance and the monnolithic case size of valve.
3, be bigger the cooperating in gap between balance valve core and valve body and the valve pocket, adopt the seal ring sealing, reduced the rate of fault of difficulty of processing and product greatly, and guaranteed the reliability that seals.
4, be provided with damping link in two places in this equilibrium valve, two damping holes are promptly arranged, improved the stability of equilibrium valve, reduced shake.
5, hydraulic oil whole circulation path in this equilibrium valve is simple in the working procedure.
Description of drawings
Fig. 1 is the utility model embodiment's a structure sectional view;
Fig. 2 is the structure sectional view of balance valve core among the utility model embodiment;
Fig. 3 is the utility model embodiment's a hydraulic schematic diagram;
The hydraulic schematic diagram that Fig. 4 uses in the oil hydraulic circuit that hoists for embodiment.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
Shown in Fig. 1～3, be a preferred embodiment of the present utility model.
A kind of cartridge balanced valve is characterized in that: this equilibrium valve includes
Nonreturn valve core 2, be located in second hydraulic fluid port 12 and axially slippage up and down of valve body 1 relatively, this nonreturn valve core 2 is held with retainer shaft by first spring 3 and upwards moves trend, by steel wire buckle 21 is spacing a spring seat 22 arranged in the lower end of second hydraulic fluid port 12, spring seat 22 is passed in the lower end of nonreturn valve core 2, and conflict in the top of the upper end of first spring 3 and nonreturn valve core 2, and the following interior edge face of the lower end of first spring 3 and spring seat 22 is conflicted, and be provided with seal ring 17 sealings between the nonreturn valve core 2 and second hydraulic fluid port 12.
Top in the balance valve core 4 has the axial passage 41 that is communicated with spring chamber A, and the bottom in the balance valve core 4 has first damping hole 42 of the valve port that is communicated with axial passage 41 and nonreturn valve core 2.
The medium position place of balance valve core 4 has annular convex shoulder 43, seal by seal ring 17 between this annular convex shoulder 43 and valve body 1 inwall, have an annular breach 431 on the bottom side face of annular convex shoulder 43, omoplate 14 in valve body 1 inwall has annular, balance valve core 4 and should annular between the omoplate 14 by seal ring 17 sealings, form oil suction chamber B between the omoplate 14 in annular breach 431 and valve body 1 inwall and the annular, the 3rd hydraulic fluid port 13 is communicated with this oil suction chamber B by second damping hole 15 on valve body 1 sidewall.
Between the inner peripheral surface of balance valve core 4 outer circumferential faces on annular convex shoulder 43 tops and valve body 1, be provided with a valve pocket 6, be provided with seal ring 17 sealings between valve pocket 6 and the balance valve core 4, be provided with seal ring 17 sealings between valve pocket 6 and valve body 1 inwall, spring chamber A is positioned at valve pocket 6 tops, constitute cavity C between valve pocket 6 lower end surfaces and annular convex shoulder 43 and valve body 1 inwall, have the duct 16 that is communicated with this cavity C on valve body 1 sidewall, the upper-end surface of balance valve core 4 has the forced section 44 that contracts in the diameter and raise up, this forced section 44 is positioned at spring chamber A, and the area of forced section 44 upper-end surfaces is less than the area of the lower end surface of balance valve core 4.
For the pressure that makes this equilibrium valve can be regulated, do following the improvement on the structure, valve body 1 upper end open, this opening internal thread is connected with an adjustment sleeve 7, the upper-end surface of the cavity of adjustment sleeve 7 and balance valve core 4 forms described spring chamber A, also be provided with a spring seat 8 in this spring chamber A, the upper-end surface of adjustment sleeve 7 is fixed with an adjusting nut 9, one adjusting screw 10 is threaded in this adjusting nut 9 and passes adjustment sleeve 7, this adjusting screw 10 is conflicted with spring seat 8 upper-end surfaces after entering spring chamber A, the upper end of second spring 5 and spring seat 8 are conflicted, and conflict in the lower end of second spring 5 and balance valve core 4 upper-end surfaces.
Each seal ring 17 that present embodiment is mentioned adopts lattice to enclose, perhaps this special circle.
As shown in Figure 4, it is the hydraulic schematic diagram that the equilibrium valve in the present embodiment is used in the oil hydraulic circuit that hoists, the hydraulic fluid port H1 of three position four-way directional control valve H in first hydraulic fluid port 11 on the valve body and the oil circuit is communicated with, second hydraulic fluid port 12 is communicated with the rodless cavity G1 of oil hydraulic cylinder G, the hydraulic fluid port H2 of three position four-way directional control valve is communicated with the rod chamber G2 of oil hydraulic cylinder, the 3rd hydraulic fluid port 13 on the valve body respectively, and two other hydraulic fluid port H3, the H4 of three position four-way directional control valve connect pressure oil-source and oil sump tank respectively.
The working procedure and the principle of this equilibrium valve are as follows:
1, the load lifting process, the piston rod that is oil hydraulic cylinder G is when overhanging: three position four-way directional control valve H is got to position, a left side, high pressure oil is via the hydraulic fluid port H3 of three position four-way directional control valve and first hydraulic fluid port 11 of hydraulic fluid port H1 inflow valve body, high pressure oil overcomes the bearing force that second spring 5 makes progress, back down nonreturn valve core 2 downwards, hydraulic oil enters the rodless cavity G1 that enters oil hydraulic cylinder behind second hydraulic fluid port 12 by valve body, and then the promotion piston rod protrudes upward oil hydraulic cylinder G, the promotion load is risen, and the oil return of rod chamber G2 is got back to oil sump tank with the hydraulic fluid port H2 and the hydraulic fluid port H4 of three position four-way directional control valve by the road on the oil hydraulic cylinder.
2, load stops, when being oil hydraulic cylinder G pinning: H gets to meta with three position four-way directional control valve, the pressure of the hydraulic oil of second hydraulic fluid port 12 acts on the lower end surface of balance valve core 4 on the one hand, the hydraulic oil of second hydraulic fluid port 12 flows into spring chamber A through first damping hole 42 and the axial passage 41 of balance valve core 4 on the other hand, the pressure of the oil that is under pressure of balance valve core 4 upper and lower end faces is in state of equilibrium, simultaneously since the elastic force of 5 pairs of balance valve cores 4 of second spring greater than the elastic force of 3 pairs of nonreturn valve cores 2 of first spring, this just makes the lower end surface of balance valve core 4 and the valve port of nonreturn valve core 2 be close together, balance valve core 4 blocks the valve port of nonreturn valve core 2 all the time, to block the connection of first hydraulic fluid port 11 and second hydraulic fluid port 12, the hydraulic oil of second hydraulic fluid port 12 is pinned, and the piston rod of oil hydraulic cylinder G can not be withdrawn.
3, when cause load to increase because of outside cause, when surpassing the safety pressure of default, because the area of forced section 44 upper-end surfaces is less than the area of the lower end surface of balance valve core 4 on the balance valve core, pretend the hydraulic coupling difference that is used in balance valve core 4 upper and lower end faces and just can overcome the effect of second spring 5, with balance valve core 4 upwards the top from the valve port of nonreturn valve core 2, the pressure of second hydraulic fluid port, 12 overloads is discharged,, pin again then until safety pressure.
4, load slowly descends, when promptly in the piston rod of oil hydraulic cylinder G is slow, contracting, three position four-way directional control valve H gets to right position, the 3rd hydraulic fluid port that high pressure oil enters valve body by hydraulic fluid port H3 and the hydraulic fluid port H2 of three position four-way directional control valve H, then via second damping hole 15 and oil suction chamber B, hydraulic oil acts on the lower end annulus area of annular convex shoulder 43 of balance valve core 4, when the pressure of oil suction chamber B rises to certain value, the active force promotion balance valve core 4 that balance valve core 4 just can overcome second spring 6 moves upward, the hydraulic oil that is positioned at cavity C is behind the duct 16 and first hydraulic fluid port 11, behind the hydraulic fluid port H1 of three position four-way directional control valve and hydraulic fluid port H4, get back to oil sump tank again, simultaneously, the hydraulic oil of spring chamber A is through in the axial passage 41 and first damping hole, 42 slow runner second hydraulic fluid ports 12 of balance valve core, at this moment, the lower end surface of balance valve core 4 breaks away from the valve port of nonreturn valve core 2, second hydraulic fluid port 12 and first hydraulic fluid port 11 are communicated with, the hydraulic oil of second hydraulic fluid port 12 is got back to oil sump tank behind the hydraulic fluid port H1 of first hydraulic fluid port 11 and three position four-way directional control valve and hydraulic fluid port H4, the piston rod of oil hydraulic cylinder G contracts in slowly.
Because first damping hole 42 and second damping hole 15 play damping function simultaneously, have strengthened the stability of this equilibrium valve in load slowly descends working procedure greatly, have reduced the shake of oil hydraulic cylinder G.
Claims (4)
1. cartridge balanced valve, it is characterized in that: this equilibrium valve includes
Valve body (1), have first hydraulic fluid port (11) and second hydraulic fluid port (12) that communicate with each other on the valve body (1), also have the 3rd hydraulic fluid port (13) on the valve body (1), described first hydraulic fluid port (11) and the 3rd hydraulic fluid port (13) are positioned on the body wall, and described second hydraulic fluid port (12) then is positioned on valve body (1) lower end surface;
Nonreturn valve core (2) is located at described second hydraulic fluid port (12) and is located also axially slippage up and down of valve body (1) relatively, and this nonreturn valve core (2) is held with retainer shaft by first spring (3) and upwards moves trend;
Balance valve core (4), be installed on medium position and axially slippage up and down of valve body (1) relatively in the valve body (1), the bottom of balance valve core (4) can cooperate to block being communicated with of first hydraulic fluid port (11) and second hydraulic fluid port (12) with the valve port of described nonreturn valve core (2), the upper space of the upper-end surface of balance valve core (4) and valve body (1) forms spring chamber (A), be provided with one in this spring chamber (A) and make balance valve core (4) retainer shaft to moving down and second spring (5) of the trend of shutoff nonreturn valve core (2) valve port, second spring (5) to the elastic force of balance valve core (4) greater than the elastic force of first spring (3) to nonreturn valve core (2);
Top in the balance valve core (4) has the axial passage (41) that is communicated with described spring chamber (A), and the bottom in the balance valve core (4) has first damping hole (42) of the valve port that is communicated with axial passage (41) and nonreturn valve core (2);
The medium position place of balance valve core (4) has annular convex shoulder (43), seal by seal ring (17) between this annular convex shoulder (43) and valve body (1) inwall, have an annular breach (431) on the bottom side face of annular convex shoulder (43), omoplate (14) in valve body (1) inwall has annular, seal by seal ring (17) between the omoplate (14) in balance valve core (4) and this annular, form oil suction chamber (B) between the omoplate (14) in described annular breach (431) and valve body (1) inwall and the annular, described the 3rd hydraulic fluid port (13) is communicated with this oil suction chamber (B) by second damping hole (15) on valve body (1) sidewall.
2. cartridge balanced valve according to claim 1, it is characterized in that: be provided with a valve pocket (6) between the inner peripheral surface of described balance valve core (4) outer circumferential face that is positioned at annular convex shoulder (43) top and valve body (1), be provided with seal ring (17) sealing between valve pocket (6) and the balance valve core (4), be provided with seal ring (17) sealing between valve pocket (6) and valve body (1) inwall, described spring chamber (A) is positioned at valve pocket (6) top, constitute chamber (C) between valve pocket (6) lower end surface and described annular convex shoulder (43) and valve body (1) inwall, have the duct (16) that is communicated with this chamber (C) on valve body (1) sidewall, the upper-end surface of balance valve core (4) has the forced section (44) that contracts in the diameter and raise up, this forced section (44) is positioned at described spring chamber (A), and the area of forced section (44) upper-end surface is less than the area of the lower end surface of balance valve core (4).
3. cartridge balanced valve according to claim 1 and 2, it is characterized in that: described valve body (1) upper end open, this opening internal thread is connected with an adjustment sleeve (7), the upper-end surface of the cavity of adjustment sleeve (7) and balance valve core (4) forms described spring chamber (A), also be provided with a spring seat (8) in this spring chamber (A), the upper-end surface of adjustment sleeve (7) is fixed with an adjusting nut (9), one adjusting screw (10) is threaded in this adjusting nut (9) and passes adjustment sleeve (7), this adjusting screw (10) enters spring chamber (A) back and conflicts with spring seat (8) upper-end surface, the upper end of described second spring (5) and spring seat (8) are conflicted, and conflict in the lower end of second spring (5) and balance valve core (4) upper-end surface.
4. cartridge balanced valve according to claim 3 is characterized in that: the profile of described valve body (1) is the multidiameter shaft shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201927993U CN201475070U (en) | 2009-08-21 | 2009-08-21 | Cartridge balance valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201927993U CN201475070U (en) | 2009-08-21 | 2009-08-21 | Cartridge balance valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201475070U true CN201475070U (en) | 2010-05-19 |
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ID=42411317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201927993U Expired - Lifetime CN201475070U (en) | 2009-08-21 | 2009-08-21 | Cartridge balance valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201475070U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101634317B (en) * | 2009-08-21 | 2011-12-28 | 宁波汉商液压有限公司 | Plug-in type balance valve |
| CN103104564A (en) * | 2012-12-13 | 2013-05-15 | 陈磊 | Inserting installation type balance valve |
| CN104455597A (en) * | 2014-12-16 | 2015-03-25 | 中煤科工集团西安研究院有限公司 | Overshoot-limited fixed-value safety valve |
| CN105805266A (en) * | 2016-05-25 | 2016-07-27 | 南通爱慕希机械股份有限公司 | Check valve assembly of hydraulic infinitely variable transmission |
| CN109026891A (en) * | 2018-08-22 | 2018-12-18 | 佛山信卓派思机械科技有限公司 | A kind of modified form balanced valve |
| CN109058216A (en) * | 2018-09-21 | 2018-12-21 | 东莞海特帕沃液压科技有限公司 | A kind of balanced valve |
-
2009
- 2009-08-21 CN CN2009201927993U patent/CN201475070U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101634317B (en) * | 2009-08-21 | 2011-12-28 | 宁波汉商液压有限公司 | Plug-in type balance valve |
| CN103104564A (en) * | 2012-12-13 | 2013-05-15 | 陈磊 | Inserting installation type balance valve |
| CN103104564B (en) * | 2012-12-13 | 2015-07-01 | 宁波江东思犒技术服务有限公司 | Inserting installation type balance valve |
| CN104455597A (en) * | 2014-12-16 | 2015-03-25 | 中煤科工集团西安研究院有限公司 | Overshoot-limited fixed-value safety valve |
| CN105805266A (en) * | 2016-05-25 | 2016-07-27 | 南通爱慕希机械股份有限公司 | Check valve assembly of hydraulic infinitely variable transmission |
| CN109026891A (en) * | 2018-08-22 | 2018-12-18 | 佛山信卓派思机械科技有限公司 | A kind of modified form balanced valve |
| CN109058216A (en) * | 2018-09-21 | 2018-12-21 | 东莞海特帕沃液压科技有限公司 | A kind of balanced valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100519 Effective date of abandoning: 20090821 |