CN1959166A - Direct action type proportional pressure-reducing valve - Google Patents
Direct action type proportional pressure-reducing valve Download PDFInfo
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- CN1959166A CN1959166A CN 200610154563 CN200610154563A CN1959166A CN 1959166 A CN1959166 A CN 1959166A CN 200610154563 CN200610154563 CN 200610154563 CN 200610154563 A CN200610154563 A CN 200610154563A CN 1959166 A CN1959166 A CN 1959166A
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Abstract
A proportional pressure release valve of direct action type is prepared as setting valve cavity in valve body and enabling to let spool move in said cavity, utilizing spool to divide valve cavity to be two cavities of M cavity and N cavity, setting proportional electromagnetic iron at one end of valve cavity, arranging oil inlet and oil outlet as well as oil discharge hole at external of valve body, using channel to connect these cavities and oil holes and setting area of N cavity to be less than that of M cavity.
Description
Technical field
The present invention relates to a kind of reduction valve, relate in particular to a kind of direct action type proportional pressure-reducing valve.
Background technique
In hydraulic transmission and control, be used for the ratio pressure Flow valve, proportional flow control valve, the pilot stage of proportion directional Flow valve, mostly be some electro-hydraulic proportional reducing valves, as domestic production: " pressure difference feedback type cone valve electro-hydraulic proportional reducing valve (Chinese patent CN96211363.8) ", patent disclosure the end of guide's spool be provided with the cone that matches with the regulating valve seat internal diameter, and the end at regulating valve seat is provided with the adjusting threaded body, the cone angle preferred values of cone is 15-40 °, and cylinder aperture is 1-6mm; At a side of pilot valve body reduction valve in parallel,,, cause energy loss to strengthen when needing because head cone and the adjustable seating open type and complete all openings of guide's spool make that the pressure oil leakage rate is big though this valve is ripe technically.In order to solve this technical problem, the applicant had once applied for patent " pressure difference feedback type precontrolled slide valve (CN01126635.X) ", the content of patent disclosure comprises guide's valve body, sliding spool and proportion electro-magnet, formerly place, the left side of guide valve core is provided with left channel, pilot valve body also is provided with the vertical passage that the lower end communicates with the epicoele of main valve, between left channel and vertical passage, be provided with damp channel, be provided with damping hole in the damp channel, the upper end of vertical passage is linked up mutually with the right-hand member passage of pilot valve body, the right lower side of pilot valve body is provided with an end and links up mutually with the draining chamber of main valve, the right lower side passage that the other end and crosspassage are linked up mutually.It is big that the valve of this structure has solved oily discharge, the technical problem that energy loss is big.But the two ends area of sliding spool equates, is subjected to the restriction of the power of electromagnet generation, and behind the generation pressure reduction, its output flow is to be subjected to certain restriction, and flow is less relatively, so the working pressure of reduction valve is also smaller.
Summary of the invention
It is big that the present invention mainly provides a kind of output flow, the direct action type proportional pressure-reducing valve that working pressure is big; It is little to solve the existing in prior technology output flow, the technical problem that working pressure is little.
The present invention also provides simultaneously a kind of convenient processing and debugging of the spool that does not wait at the two ends area, the direct action type proportional pressure-reducing valve that is easy to apply; Solved the technical problem of the spool processing and debugging inconvenience that exists in the prior art.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of direct action type proportional pressure-reducing valve, comprise valve body, spool, be provided with the valve pocket that spool is moved in the valve body, valve pocket is separated into two cavitys by spool, be respectively M chamber and N chamber, the wherein end N end of valve pocket is provided with proportion electro-magnet, the outer oil inlet P mouth that is provided with of valve body, oil outlet A mouth and leakage hydraulic fluid port T mouth, be provided with in the valve body respectively with valve pocket and P mouth, the A mouth, the passage that the T mouth is connected, the area in described N chamber is provided with the passage that is interconnected less than the area in M chamber between M chamber and the N chamber, A mouth and M chamber, also be provided with the passage that is interconnected between the N chamber; Spool (2) is provided with groove (2-1) corresponding to P mouth place, and the axial end that constitutes the spool of groove is throttling limit (Z-Z), and the throttling limit is located between P mouth and the A mouth; In valve body, valve pocket is provided with outward the pipeline in T mouth and the connection of A mouth, and connecting pipe is provided with damping.Spool moves in valve pocket, and the external diameter of spool should match with the internal diameter of valve pocket, because the diameter difference at valve pocket two ends, so the area difference at spool two ends.Because the groove that is provided with forms two convex shoulders on spool, correspondence is the throttling limit in the annular edge of the convex shoulder at P mouth place, the flow of control from the P mouth to the A mouth.
Because M chamber, two ends, the N chamber of spool are communicated with, pressure is identical, according to stress balance:
A
M* P
2=A
N* P
2+ F, i.e. P
2=F/ (A
M-A
N)
Wherein: A
MArea for spool M end;
A
NArea for spool N end;
F is the thrust of proportion electro-magnet, generally at 80-100N;
P
2Be the pressure of M, N end, the i.e. pressure of A mouth.
Be not difficult to find out that according to formula when there was area difference in the spool two ends, it is big that the pressure of output can become.
The pressure oil in P chamber is P
1, pressure oil enters from the P chamber, through decompression throttling limit Z-Z, arrive load cavity A chamber, and pressure is from P
1Reduce to P
2, meanwhile, to spool M, N two ends, oil pressure is all P to the oil in load cavity A chamber by the oily passage of the control that is provided with on the spool
2Proportion electro-magnet is arranged on the N end, and the thrust that provides is F.Proportional valve is when work, and the spool two ends form transient equiliblium, as long as changed proportion electro-magnet thrust F, can change load cavity A cavity pressure P
2, and proportional linear change.
When the A cavity pressure is higher than when pressure is set, spool moves to the N end, and decompression throttling limit opening reduces, and the A cavity pressure reduces, and is through to pressure is set.When the A cavity pressure is lower than when pressure is set, the spool movement direction is opposite.
Be provided with fixedly damping R between A chamber and the T chamber, make A chamber fluid keep flowing, but to flow be very little for this, when the A mouth does not have flow output, can keep decompression state all the time.
The throttling limit can be complete all opening forms, also can the complete all opening form of right and wrong, and the connection of P mouth and A mouth can be to finish by the groove that forms the throttling limit, also can offer passage in spool, with two mouthfuls of connections.As preferably, the groove on the spool is the annular groove of complete all openings, and the width of groove equates to the distance between the A mouth with the P mouth.Adopt complete all opening forms, easy to process and flow is bigger.If circulate by pipeline between P mouth and the A mouth, may cause resistance excessive, and make energy loss bigger, also there is the inconvenience of using simultaneously, adopts channel connection relatively stricter, inconvenient assembling and setting the exit position requirement of passage, so P mouth and A mouth are communicated with by groove, form a communicated cavity, processing uses debugging all very convenient, and energy loss is also smaller.
As preferably, on the valve body between M chamber and the N chamber, be provided with three annular grooves, groove is corresponding with P mouth, A mouth and T mouth respectively, forms P chamber, A chamber and T chamber.Columned valve pocket makes things convenient for the motion of spool.Spool is divided into M chamber and N chamber with valve pocket after placing in the valve pocket.Offer groove in the valve pocket scope on valve body, the position of groove is corresponding with P mouth, A mouth T mouth respectively, forms P chamber, A chamber and T chamber.Thus, in spool is inserted valve pocket after, valve pocket is separated into 5 cavitys from left to right by spool, is respectively M chamber, P chamber, A chamber, T chamber and N chamber.
As preferably, the M of described spool end butt has an end of spring, and the other end of spring is connected on the chamber wall in M chamber.The spring of M end is connected to an end of spool, because the M of spool end has individual power always, makes the other end of spool be connected on the proportion electro-magnet always.
With the passage of M chamber and the connection of N chamber can be in spool, also can be by the outer channel connection of spool, and certainly, passage can be to be horizontally disposed with, and also can be to be obliquely installed, and perhaps is provided with in the known mode of other public.As preferably, the passage that described M chamber is communicated with the N chamber is divided into two sections, and to being horizontally disposed with, M chamber and A chamber are communicated with by horizontal channel wherein along poppet shaft for two sections passages, the A chamber is communicated with by another horizontal channel with the N chamber, and two sections passage joints are provided with a Vertical Channel; Horizontally disposed passage is connected with another Vertical Channel at the N of spool end place.The Vertical Channel of connecting part, two sections horizontal channels is in normally open all the time, and active chamber A chamber is communicated with M chamber and N chamber.The Vertical Channel that is provided with in the N chamber is in order pressure oil to be input to the N chamber, the M chamber to be communicated with the N chamber, and the Vertical Channel at N end place also can tilt, and perhaps is " people " font or the like.
As more preferably, proportion electro-magnet is connected to the N end of spool.Only be provided with spool in the valve pocket, the length of spool is less than the length of valve pocket, and proportion electro-magnet directly is connected on the spool, and this spline structure is simple relatively.
In order to adapt to cooperating of spool and valve pocket, as preferably, to stepped between the electromagnet, the diameter of spool successively decreases spool by the T chamber, and the channel outlet of N end is provided with first order ladder, and place, T chamber is provided with second level ladder.The step transition at place, T chamber makes that diameter herein is identical with the diameter of valve pocket M end, and N end channel outlet is with A chamber and the passage that the N chamber is communicated with, and in the outlet port step transition is set, and is in order to make that pressure oil can free-flow between N chamber and A chamber.
Preferred as another, the described passage that the M chamber is communicated with the N chamber is divided into two sections, the passage that wherein is communicated with M chamber and A chamber along poppet shaft to being horizontally disposed with, the passage that is communicated with A chamber and N chamber is horizontally set in the valve body, a Vertical Channel is established in connecting part, two sections horizontal channels, the passage of this passage for the A chamber is connected with M chamber, N chamber.
As more preferably, the N of spool end butt has an end of plunger, and the other end of plunger is connected on the proportion electro-magnet.End at spool is provided with plunger, and plunger can be regarded as a prolongation of spool in order to substitute the part of spool, and it is arranged on the N end of spool, and cooperates with the N chamber.The external peripheral surface diameter of spool is identical with M chamber diameter, and the diameter of the external peripheral surface of plunger is identical with N chamber diameter.Because the area difference at valve pocket two ends, if adopt same spool, processing is difficulty relatively, and is also very inconvenient when debugging.Valve pocket to different cross section adopts different spools, convenient cooperation Installation and Debugging.
As preferably, the area in described M chamber and the area difference in N chamber are less than 1cm
2According to foregoing formula A
M* P
2=A
N* P
2+ F, i.e. P
2=F/ (A
M-A
N).When area difference less than 1cm
2Be that its output pressure can reach 20Mpa.
Therefore, the present invention has the following advantages: 1. because the difference of the internal diameter at valve pocket two ends, make that the output services flow is big, can reach more than the 60lit/min, the working pressure of reduction valve can reach more than the 20Mpa, with original working flow be 2lit/min only, working pressure 2Mpa compares, and has significant raising; 2. spool is easy to process, and assembling and setting is convenient; 3, applied range.
Description of drawings:
Fig. 1 is a direct action type proportional pressure-reducing valve structural representation of the present invention.
Fig. 2 is a kind of direct action type proportional pressure-reducing valve structural representation of the present invention
The concrete example of implementing:
Below by embodiment, and in conjunction with the accompanying drawings, technological scheme of the present invention is described in further detail.
Embodiment 1:
As shown in Figure 1, direct action type proportional pressure-reducing valve comprises valve body 1, spool 2, be provided with the valve pocket 3 that can allow spool 2 move around in the valve body 1, described valve pocket is cylindric, and valve pocket 3 two ends are M end and N end, the diameter of M end is greater than the diameter of N end, and the area difference at two ends is 0.8cm
2The length of valve pocket 3 after spool 2 places in the valve pocket, respectively forms two cavitys at M end and N end greater than the length of spool 2, and M chamber 3-1 and N chamber 3-5 are provided with the spring 4 with spool 2 butts in the 3-1 of M chamber.The valve body 1 outer oil inlet P mouth that is provided with, oil outlet A mouth and leakage hydraulic fluid port T mouth, be provided with the passage that respectively valve pocket 3 is connected with P mouth, A mouth, T mouth in the valve body 1, between end of the M on the valve body 1 and N end, be provided with three annular grooves, groove is corresponding with P mouth, A mouth and T mouth respectively, forms P chamber 3-2, A chamber 3-3 and T chamber 3-4.Therefore, after spool 2 was packed in the valve pocket 3, valve pocket 3 was divided into five cavitys by spool, is respectively M chamber 3-1, P chamber 3-2, A chamber 3-3, T chamber 3-4 and N chamber 3-5 from left to right.
In valve body 1, valve pocket 3 outer being provided with pipeline 5 in T mouth and the connection of A mouth, connecting pipe 5 is provided with damping R.
Be provided with the passage with M end and the connection of N end in the spool 2, described passage is to constitute to horizontally disposed passage 6-1,6-2 and two sections Vertical Channel that are parallel to each other 7,8 along poppet shaft by two sections.Two sections horizontal channel 6-1,6-2 join at 3-3 place, A chamber, and the connecting part is provided with a Vertical Channel 7, and A chamber 3-3 is communicated with M chamber 3-1 and N chamber 3-5, are provided with another Vertical Channel 8 at the N of spool 2 end, are convenient to flowing of pressure oil.Spool 2 is as a whole, at the proportional solenoid valve 9 of the N of spool 2 end butt.Spool 2 from the T chamber to proportion electro-magnet one section between 9 stepped, the diameter of spool 2 successively decreases, Vertical Channel 8 outlets of N end are provided with first order ladder, place, T chamber is provided with second level ladder.Spool 2 is identical with the diameter in N chamber at T chamber place diameter, at the diameter in Vertical Channel 8 outlet ports diameter less than the N chamber, thus can be so that pressure oil be smooth and easy mobile.
Embodiment 2:
As shown in Figure 2, direct action type proportional pressure-reducing valve comprises valve body 1, spool 2, be provided with the valve pocket 3 that can allow spool 2 move around in the valve body 1, described valve pocket 3 is cylindric, and valve pocket 3 two ends are M end and N end, the diameter of M end is greater than the diameter of N end, and the area difference at two ends is 0.5cm
2The length of valve pocket 3 after spool 2 places in the valve pocket 3, respectively forms two cavitys at M end and N end greater than the length of spool 2, and M chamber 3-1 and N chamber 3-5 are provided with the spring 4 with spool 2 butts in the 3-1 of M chamber.Be provided with three annular grooves between end of the M on the valve body 1 and N end, groove is corresponding with P mouth, A mouth and T mouth respectively, forms P chamber 3-2, A chamber 3-3 and T chamber 3-4.M chamber and N chamber are to be connected by communication passage, and communication passage is divided into two sections, and wherein one section 6-1 is horizontally disposed with along the axial direction of spool 2, and another section 6-2 is arranged on the outer valve body 1 of spool 2, horizontal arrangement.Two sections connecting parts are provided with a Vertical Channel 7, and the opening of Vertical Channel 7 is arranged on the top of A chamber 3-3, make that the pressure of M chamber 3-1, N chamber 3-5 is identical with the pressure of A chamber 3-3.
Be provided with plunger 10 in the 3-5 of N chamber, plunger 10 also is cylindric, and an end of plunger 10 and spool 2 join at 3-4 place, T chamber, on the other end butt proportion electro-magnet 9 of plunger 10.The excircle diameter of spool 2 is identical with the internal diameter of M chamber 3-1, and the diameter of plunger 10 is identical with the internal diameter of N chamber 3-5.All the other and embodiment 1 are together.
Specific embodiment described herein only is the present invention to be conceived illustrate.The technician of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can not depart from design of the present invention or surmount the defined scope of appended claims.
Claims (10)
1. direct action type proportional pressure-reducing valve, comprise valve body (1), spool (2), be provided with the valve pocket (3) that spool (2) is moved in the valve body (1), valve pocket (3) is separated into two cavitys by spool (2), be respectively M chamber (3-1) and N chamber (3-5), the wherein end N end of valve pocket (3) is provided with proportion electro-magnet (9), the outer oil inlet P mouth that is provided with of valve body (1), oil outlet A mouth and leakage hydraulic fluid port T mouth, be provided with in the valve body respectively with valve pocket and P mouth, the A mouth, the passage that the T mouth is connected, it is characterized in that: the area in described N chamber (3-5) is less than the area of M chamber (3-1), be provided with the passage that is interconnected between M chamber (3-1) and N chamber (3-5), A mouth and M chamber (3-1), also be provided with the passage that is interconnected between the N chamber (3-5); Spool (2) is provided with groove (2-1) corresponding to P mouth place, and the axial end that constitutes the spool of groove is throttling limit (Z-Z), and the throttling limit is located between P mouth and the A mouth; In valve body, valve pocket is provided with outward the pipeline (5) in T mouth and the connection of A mouth, and connecting pipe (5) is provided with damping.
2. direct action type proportional pressure-reducing valve according to claim 1 is characterized in that: the groove (2-1) on the spool (2) is the annular groove of complete all openings, and the width of groove (2-1) equates to the distance between the A mouth with the P mouth.
3. direct action type proportional pressure-reducing valve according to claim 2, it is characterized in that: on the valve body between M chamber (3-1) and N chamber (3-5), be provided with three annular grooves, groove is corresponding with P mouth, A mouth and T mouth respectively, forms P chamber (3-2), A chamber (3-3) and T chamber (3-4).
4. direct action type proportional pressure-reducing valve according to claim 3 is characterized in that: the M end butt of described spool (2) has an end of spring (4), and the other end of spring (4) is connected on the chamber wall in M chamber (3-1).
5. according to any described direct action type proportional pressure-reducing valve of claim of claim 1 to 4, it is characterized in that: the passage (6) that described M chamber (3-1) is communicated with N chamber (3-5) is divided into two sections, two sections passages along poppet shaft to being horizontally disposed with, M chamber and A chamber are communicated with by a horizontal channel (6-1) wherein, the A chamber is communicated with by another horizontal channel (6-2) with the N chamber, and two sections passages (6-1,6-2) joint is provided with a Vertical Channel (7); Horizontally disposed passage is connected with another Vertical Channel (8) at the N of spool end place.
6. direct action type proportional pressure-reducing valve according to claim 5, it is characterized in that: proportion electro-magnet (9) is connected to the N end of spool (2), spool (2) by the T chamber to stepped between the electromagnet, the diameter of spool (2) successively decreases, Vertical Channel (8) outlet at the N end is provided with first order ladder, and (3-4) locates to be provided with second level ladder in the T chamber.
7. according to any described direct action type proportional pressure-reducing valve of claim of claim 1 to 4, it is characterized in that: the described passage that M chamber (3-1) is communicated with N chamber (3-5) is divided into two sections, the passage (6-1) that wherein is communicated with M chamber and A chamber axially is horizontally disposed with along spool (2), the passage (6-2) that is communicated with A chamber and N chamber is horizontally set in the valve body (1), a Vertical Channel (7) is established in connecting part, two sections horizontal channels, the passage of this passage for A chamber (3-3) is connected with M chamber (3-1), N chamber (3-5).
8. direct action type proportional pressure-reducing valve according to claim 7 is characterized in that: the N end butt of spool (2) has an end of plunger (10), and the other end of plunger (10) is connected on the proportion electro-magnet (9).
9. direct action type proportional pressure-reducing valve according to claim 8 is characterized in that: the external peripheral surface diameter of spool (2) is identical with M chamber (3-1) diameter, and the diameter of the external peripheral surface of plunger (10) is identical with N chamber (3-5) diameter.
10. direct action type proportional pressure-reducing valve according to claim 1 and 2 is characterized in that: the area difference of the area in described M chamber (3-1) and N chamber (3-5) is less than 1cm
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101545631A CN100414154C (en) | 2006-11-08 | 2006-11-08 | Direct action type proportional pressure-reducing valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101545631A CN100414154C (en) | 2006-11-08 | 2006-11-08 | Direct action type proportional pressure-reducing valve |
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| Publication Number | Publication Date |
|---|---|
| CN1959166A true CN1959166A (en) | 2007-05-09 |
| CN100414154C CN100414154C (en) | 2008-08-27 |
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ID=38070986
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|---|---|---|---|
| CNB2006101545631A Active CN100414154C (en) | 2006-11-08 | 2006-11-08 | Direct action type proportional pressure-reducing valve |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102996544A (en) * | 2012-10-31 | 2013-03-27 | 无锡鸿声铝业有限公司 | Dual-oil-circuit pressure reducing valve of rubber molding equipment |
| CN103032413A (en) * | 2012-12-27 | 2013-04-10 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Safe and stable valve for hydraulic servo system |
| CN102042275B (en) * | 2009-10-16 | 2013-04-24 | 中国航天科技集团公司第六研究院第十一研究所 | Direct-acting two-position four-way proportional pressure relief valve |
| CN105332674A (en) * | 2015-10-26 | 2016-02-17 | 东北石油大学 | Bidirectionally-controllable valve opened at low speed and closed at high speed in well |
| CN106402068A (en) * | 2015-07-29 | 2017-02-15 | 长城汽车股份有限公司 | Hydraulic valve |
| CN107663869A (en) * | 2016-07-29 | 2018-02-06 | 住友建机株式会社 | Excavator |
| CN107725517A (en) * | 2017-09-30 | 2018-02-23 | 中国第汽车股份有限公司 | A kind of proportional flow magnetic valve |
| CN107990021A (en) * | 2017-11-14 | 2018-05-04 | 西安交通大学 | A kind of direct-acting triple pressure reducing valve with pressure feedback structure |
| CN111120444A (en) * | 2020-01-22 | 2020-05-08 | 浙江高宇液压机电有限公司 | Differential compensation priority unloading valve |
| CN111442007A (en) * | 2020-04-07 | 2020-07-24 | 上海诺玛液压系统有限公司 | Large-traffic direct action type proportion relief pressure valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4369677A (en) * | 1980-07-03 | 1983-01-25 | Ford Motor Company | Transmission throttle pressure regulator assembly |
| CN2272083Y (en) * | 1996-05-20 | 1998-01-07 | 杭州精工液压机电有限公司 | Differential pressure feedback cone valve electrohydraulic proportional pressure reducing vavle |
| JPH11351433A (en) * | 1998-06-08 | 1999-12-24 | Kenji Masuda | Proportional throttle valve |
| CN1149344C (en) * | 2001-09-05 | 2004-05-12 | 宁波华液机器制造有限公司 | Pressure difference feedback type precontrolled slide valve |
| CN1256523C (en) * | 2003-09-03 | 2006-05-17 | 浙江大学 | Super high pressure air-actuated proportional pressure-reducing valve |
| CN200975530Y (en) * | 2006-11-08 | 2007-11-14 | 宁波华液机器制造有限公司 | Direct-action proportional relief pressure valve |
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2006
- 2006-11-08 CN CNB2006101545631A patent/CN100414154C/en active Active
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| CN102042275B (en) * | 2009-10-16 | 2013-04-24 | 中国航天科技集团公司第六研究院第十一研究所 | Direct-acting two-position four-way proportional pressure relief valve |
| CN102996544A (en) * | 2012-10-31 | 2013-03-27 | 无锡鸿声铝业有限公司 | Dual-oil-circuit pressure reducing valve of rubber molding equipment |
| CN103032413A (en) * | 2012-12-27 | 2013-04-10 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Safe and stable valve for hydraulic servo system |
| CN103032413B (en) * | 2012-12-27 | 2015-09-16 | 中国航空工业集团公司金城南京机电液压工程研究中心 | A kind of for Hydrauservo System safety and stability valve |
| CN106402068A (en) * | 2015-07-29 | 2017-02-15 | 长城汽车股份有限公司 | Hydraulic valve |
| CN105332674B (en) * | 2015-10-26 | 2017-11-17 | 东北石油大学 | The two-way controllable valve door that underground low speed is opened, closed at a high speed |
| CN105332674A (en) * | 2015-10-26 | 2016-02-17 | 东北石油大学 | Bidirectionally-controllable valve opened at low speed and closed at high speed in well |
| CN107663869A (en) * | 2016-07-29 | 2018-02-06 | 住友建机株式会社 | Excavator |
| CN107725517A (en) * | 2017-09-30 | 2018-02-23 | 中国第汽车股份有限公司 | A kind of proportional flow magnetic valve |
| CN107990021A (en) * | 2017-11-14 | 2018-05-04 | 西安交通大学 | A kind of direct-acting triple pressure reducing valve with pressure feedback structure |
| CN107990021B (en) * | 2017-11-14 | 2019-11-26 | 西安交通大学 | A kind of direct-acting triple pressure reducing valve with pressure feedback structure |
| CN111120444A (en) * | 2020-01-22 | 2020-05-08 | 浙江高宇液压机电有限公司 | Differential compensation priority unloading valve |
| CN111120444B (en) * | 2020-01-22 | 2022-06-14 | 浙江高宇液压机电有限公司 | Differential compensation priority unloading valve |
| CN111442007A (en) * | 2020-04-07 | 2020-07-24 | 上海诺玛液压系统有限公司 | Large-traffic direct action type proportion relief pressure valve |
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