CN102235393A - Buffer relief valve for hydraulic motor - Google Patents
Buffer relief valve for hydraulic motor Download PDFInfo
- Publication number
- CN102235393A CN102235393A CN2011102322472A CN201110232247A CN102235393A CN 102235393 A CN102235393 A CN 102235393A CN 2011102322472 A CN2011102322472 A CN 2011102322472A CN 201110232247 A CN201110232247 A CN 201110232247A CN 102235393 A CN102235393 A CN 102235393A
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Abstract
The invention discloses a buffer relief valve for a hydraulic motor, which comprises a valve body, a valve seat, a valve sleeve and a screw plug which are matched mutually, wherein the valve sleeve is provided with a valve plug assembly; a buffer piston is sleeved in a sliding cavity position on the valve body on the outer peripheral surface of the valve sleeve in a sliding manner and is provided with a buffer cavity with the screw plug formed at the left end opening of the valve body; the buffer cavity is communicated with an oil inlet of the valve body by a radial damping hole formed by the valve sleeve and an axial hole of the valve plug assembly; and the buffer piston realizes the buffer function of the relief valve by differential pressure delay caused by right shift. The relief valve is compact in a structure and easy to manufacture, and can improve the hydraulic impact of the hydraulic rotation motor during starting and braking and the operability of the hydraulic rotation motor obviously so as to improve prolong the service life of system hydraulic elements.
Description
Technical field
The present invention relates to machinery, technical field of hydraulic, particularly a kind of relief valve, specifically a kind of buffering type relief valve that is used for oil hydraulic motor.
Background technique
In the engineering machinery system, a lot of swirl gears is arranged when motion, because the rotary inertia of getting on the bus is big, when starting, braking or commutating suddenly, can cause very big hydraulic shock.When especially running into obstacle in the turning course and stopping suddenly, hydraulic shock is more obvious.The hydraulic shock meeting causes whole hydraulic system and element to produce vibration and noise, even destroys.In the prior art; people generally adopt the rotary motor relief valve to limit the Maximum operating pressure of rotary system; but common relief valve is difficult to again to eliminate fully or absorption system starts or the hydraulic shock during braking; thereby can't further improve the operating characteristics of system, can not protect the working life of hydraulic element better.
Summary of the invention
Technical problem to be solved by this invention is at above-mentioned prior art present situation, and provide have simple for structure, easy to install, can eliminate the hydraulic pressure fluctuation by buffer function absorption system pressure pulse, realize starting, stopping a kind of stably buffering type relief valve that is used for oil hydraulic motor.
The present invention solves the problems of the technologies described above the technological scheme that is adopted: a kind of buffering type relief valve that is used for oil hydraulic motor, comprise equipped mutually valve body, valve seat, valve pocket and plug screw, valve pocket is equipped with mangetic core assembly, the sliding chamber flip sleeve that is arranged in valve body on the valve pocket outer peripheral surface is equipped with damper piston, damper piston is formed with buffer cavity with the plug screw that is installed in the valve body left port, the radially damping hole that buffer cavity is shaped on through valve pocket and the axial bore of mangetic core assembly are connected with the filler opening of valve body, the pressure reduction time-delay that damper piston produces by moving to right, the pooling feature of realization relief valve.
For optimizing technique scheme, the measure of taking also comprises:
Above-mentioned mangetic core assembly comprises spool, pressure spring and adjusting bolt; Spool and pressure spring are installed in the valve pocket, regulate the rear port that bolt is arranged on valve pocket, the two ends of pressure spring are respectively with spool with regulate bolt roof pressure mutually, regulate the pre-tensile force that bolt can the adjustable diameter and screw adjusting pressure spring, and the axial bore of mangetic core assembly is to prolong the axial hole that the spool axle center is shaped on.
Above-mentioned valve pocket is shaped on and connects fluid chamber, slide bar pilot hole and compression chamber successively, spool is shaped on valve head and valve rod, valve head is arranged in anterior fluid chamber, the valve rod liquid sealing slides with the slide bar pilot hole and matches, and an end of valve rod extend in the compression chamber be fitted in compression chamber in pressure spring push up mutually and join, radially damping hole is positioned at the back segment of valve pocket compression chamber, and fluid chamber is shaped on the oil outlet that is communicated with the valve body return opening.
Above-mentioned spool axial hole is shaped on first damping hole, and the import of spool axial hole is gradually little funneling taper hole.
Be shaped on boss face on the above-mentioned valve rod, boss face cutting ferrule apical grafting has pressure pad, and the front end of pressure spring pushes up with spool mutually through pressure pad joins.
Above-mentioned valve seat fixedly is fitted in the front end of valve pocket, and valve seat is shaped on the attachment hole that is communicated with valve body filler opening and spool axial hole, and the attachment hole expansion is shaped on the circular arc camber hole of matching with the sealing bulb sealing of valve head.
Above-mentioned plug screw fixing seal is installed in the left port of valve body, and plug screw is shaped on the pilot hole that contains internal thread, and the outside thread of regulating bolt is connected with the internal thread spiral of pilot hole and matches, and the reaming table top of the ear end face of valve pocket and pilot hole is apical grafting mutually.
Above-mentioned damper piston periphery wall matches with the sliding chamber inner circle wall slipper seal of valve body, and the sliding chamber of valve body right-hand member wall has the oil duct that is communicated with the valve body return opening.
Compared with prior art, the present invention increases on the basis of traditional relief valve and is provided with damper piston, and valve pocket and spool all are shaped on damping hole, damper piston is sleeved on the valve pocket, by moving to right and the throttling action of damping hole of damper piston, utilize the pressure reduction of oil pressure that spool is opened, after moving to right of damper piston finished, utilize the balance of spool two ends oil pressure and the acting in conjunction of pressure spring to make spool be in closed condition.The size of damping hole of the present invention can determine the size of fluid flow, and then can determine the time of buffering, by the project organization of buffering type, plays startup steadily, the effect of braking absorption pressure pulse.Protective system safety is improved the system operation performance.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the equipped preceding structural representation of the present invention and valve body;
Fig. 3 is the assembly structure figure of mangetic core assembly among Fig. 1;
Fig. 4 is the structural representation of valve pocket among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
Fig. 1 is to Figure 4 shows that structural representation of the present invention.
Reference character wherein is: oil inlet P, oil return inlet T, valve body 1, sliding chamber 11, oil duct 12, valve seat 2, attachment hole 21, valve pocket 3, fluid chamber 3a, slide bar pilot hole 3b, compression chamber 3c, radially damping hole 31, oil outlet 32, mangetic core assembly 4, spool 41, axial hole 41a, the first damping hole 41b, taper hole 41c, valve head 411, valve rod 412, boss face 412a, sealing bulb 413, pressure spring 42, regulate bolt 43, damper piston 5, buffer cavity 5a, pressure pad 6, plug screw 7, reaming table top 7a.
As shown in Figures 1 to 4, a kind of buffering type relief valve that is used for oil hydraulic motor of the present invention, comprise equipped mutually valve body 1, valve seat 2, valve pocket 3 and plug screw 7, valve pocket 3 is equipped with mangetic core assembly 4, wherein: sliding chamber 11 flip sleeves that are arranged in valve body 1 on valve pocket 3 outer peripheral surfaces are equipped with damper piston 5, damper piston 5 is formed with buffer cavity 5a with the plug screw 7 that is installed in valve body 1 left port, the radially damping hole 31 that buffer cavity 5a is shaped on through valve pocket 3 and the axial bore of mangetic core assembly 4 are connected with the oil inlet P of valve body 1, the pressure reduction time-delay that damper piston 5 produces by moving to right, the pooling feature of realization relief valve.Compared with prior art the present invention is set with damper piston 5 on valve pocket 3, rely on moving to right and the valve pocket throttling action of damping hole 31 radially of damper piston 5, realize the buffering of relief valve, reach and absorb the retardation pressure pulse, elimination hydraulic pressure fluctuates, and improves the purpose of system operation performance.
As Fig. 2, shown in Figure 3, mangetic core assembly 4 of the present invention comprises spool 41, pressure spring 42 and regulates bolt 43; Spool 41 and pressure spring 42 are installed in the valve pocket 3, regulate the rear port that bolt 43 is arranged on valve pocket 3, the two ends of pressure spring 42 are respectively with spool 41 with regulate bolt 43 roof pressure mutually, regulate the pre-tensile force of bolt 43 energy adjustable diameter and screw adjusting pressure springs 42, the axial bore of mangetic core assembly is to prolong the axial hole 41a that spool 41 axle center are shaped on.Regulate the rear end of bolt 43 roof pressures at pressure spring 42, pressure spring 42 has determined the cracking pressure of spool 41, and in real work, people can be according to the requirement of system condition, change the pressure set points of pressure spring 42 by regulating bolt 43, thereby determine the pressure range that spool is closed.
As Fig. 2, Fig. 3, shown in Figure 4, valve pocket 3 of the present invention is shaped on and connects fluid chamber 3a, slide bar pilot hole 3b and compression chamber 3c successively, spool 41 is shaped on valve head 411 and valve rod 412, valve head 411 is arranged in anterior fluid chamber 3a, valve rod 412 liquid sealings slide with slide bar pilot hole 3b and match, and an end of valve rod 412 extend among the compression chamber 3c be fitted in compression chamber 3c in pressure spring 42 push up mutually and join, radially damping hole 31 is positioned at the back segment of valve pocket 3 compression chamber 3c, and fluid chamber 3a is shaped on the oil outlet 32 that is communicated with the valve body oil return inlet T.Valve rod 412 liquid sealings of the present invention match with slide bar pilot hole 3b, and fluid chamber 3a and compression chamber 3c are isolated into separate cavity.
Spool axial hole 41a of the present invention is shaped on the first damping hole 41b, and the import of spool axial hole 41a is gradually little funneling taper hole 41c.As shown in Figure 3, be shaped on boss face 412a on the valve rod 412, boss face 412a cutting ferrule apical grafting has pressure pad 6, and the front end of pressure spring 42 pushes up with spool 41 mutually through pressure pad 6 joins.
As shown in Figure 1, the outer circumferential face of valve seat 2 of the present invention is equipped mutually with the right-hand member mounting hole sealing of valve body 1, valve seat 2 fixedly is fitted in earlier the front end of valve pocket 3, be pressed into together in the valve body 1 with valve pocket 3 then, valve seat 2 is fastenedly connected with valve pocket 3 and is integral, valve seat 2 is shaped on the attachment hole 21 that is communicated with valve body oil inlet P and spool axial hole 41a, and attachment hole 21 expansions are shaped on the circular arc camber hole of matching with sealing bulb 413 sealings of valve head 411.The match oil circuit of control oil inlet P and oil return inlet T of valve seat 2 and spool 41 is connected break-make.
As shown in Figure 1, damper piston 5 periphery walls match with the sliding chamber 11 inner circle wall slipper seals of valve body, and the sliding chamber of valve body 11 right-hand member walls have the oil duct 12 that is communicated with the valve body oil return inlet T.
Position when Figure 1 shows that original state of the present invention, working principle of the present invention is:
The sealing bulb 413 of spool 41 is close to the circular arc camber hole of valve seat 2 under the effect of pressure spring 42 when original state, closes the passage of hydraulic oil from the oil inlet P to the oil return inlet T, and damper piston 5 is owing to be in the high order end in the sliding chamber 11 of valve body under the action of last time.Along with slewing directional control valve in the system is got back to meta, oil inlet P, the oil return inlet T of oil hydraulic motor are closed by rotary control valve.This moment, oil hydraulic motor can continue rotation owing to the effect of inertia of mechanism, and the oil hydraulic motor function is converted to pump.The hydraulic pressure of relief valve oil inlet P begins to rise, pressure oil is through the taper hole 41c of spool 41, the first damping hole 41b, spool axial hole 41a, compression chamber 3c and radially damping hole 31 enter the left end buffer cavity 5a of damper piston 5, because the pressure of oil inlet P makes damper piston 5 move right greater than the pressure of oil return inlet T at this moment, in damper piston 5 moving process,, the damping function of the first damping hole 41b causes the pressure of the pressure of oil inlet P greater than compression chamber 3c and pressure spring 42 because making flowing liquid produce pressure reduction, the pressure that spool 41 overcomes pressure spring 42 is moved to the left, lift off a seat 2 circular arc camber hole of sealing bulb 413 makes pressure oil flow to oil return inlet T from oil inlet P.When damper piston 5 moves to the sliding chamber of low order end and valve body 11 right-hand member walls mutually during apical grafting, flow of fluid is static, this moment, the hydraulic pressure of compression chamber 3c equated with the hydraulic pressure of oil inlet P, because the effect of pressure spring 42 pretightening forces, the pressure of carrying that makes spool 41 left ends is greater than right-hand member, move right thereby promote spool 41, sealing bulb 413 cooperates with the circular arc camber hole sealing apical grafting of valve seat 2 once more, has closed the connecting passage of oil inlet P and oil return inlet T.The present invention also has an of short duration opening procedure when normal revolution, but has just closed at once.Start steadily the effect of absorption pressure pulse during braking thereby can play.
Great advantage of the present invention is, by the valve pocket increase structure of damper piston arranged, and the hydraulic shock when having improved the startup of rotary motor and braking significantly improve its operating characteristics, and it is simple in structure, and is easy to install.
Most preferred embodiment of the present invention is illustrated, and various variations or the remodeling made by those of ordinary skills can not depart from the scope of the present invention.
Claims (8)
1. buffering type relief valve that is used for oil hydraulic motor, comprise equipped mutually valve body (1), valve seat (2), valve pocket (3) and plug screw (7), described valve pocket (3) is equipped with mangetic core assembly (4), it is characterized in that: sliding chamber (11) flip sleeve that is arranged in valve body (1) on described valve pocket (3) outer peripheral surface is equipped with damper piston (5), damper piston (5) is formed with buffer cavity (5a) with the plug screw (7) that is installed in valve body (1) left port, the radially damping hole (31) that described buffer cavity (5a) is shaped on through valve pocket (3) and the axial bore of mangetic core assembly (4), both all are connected with the filler opening (P) of valve body (1), the pressure reduction time-delay that damper piston (5) produces by moving to right, the pooling feature of realization relief valve.
2. a kind of buffering type relief valve that is used for oil hydraulic motor according to claim 1 is characterized in that: described mangetic core assembly (4) comprises spool (41), pressure spring (42) and regulates bolt (43); Described spool (41) and pressure spring (42) are installed in the valve pocket (3), regulate the rear port that bolt (43) is arranged on valve pocket (3), the two ends of described pressure spring (42) are respectively with spool (41) with regulate bolt (43) roof pressure mutually, regulate the pre-tensile force of bolt (43) energy adjustable diameter and screw adjusting pressure spring (42), the axial bore of described mangetic core assembly is for prolonging the axial hole (41a) that spool (41) axle center is shaped on.
3. a kind of buffering type relief valve that is used for oil hydraulic motor according to claim 2, it is characterized in that: described valve pocket (3) is shaped on and connects fluid chamber (3a) successively, slide bar pilot hole (3b) and compression chamber (3c), described spool (41) is shaped on valve head (411) and valve rod (412), valve head (411) is arranged in anterior fluid chamber (3a), described valve rod (412) liquid sealing slides with slide bar pilot hole (3b) and matches, and an end of valve rod (412) extend in the compression chamber (3c) be fitted in compression chamber (3c) in pressure spring (42) push up mutually and join, described radially damping hole (31) is positioned at the back segment of valve pocket (3) compression chamber (3c), and described fluid chamber (3a) is shaped on the oil outlet (32) that is communicated with valve body return opening (T).
4. a kind of buffering type relief valve that is used for oil hydraulic motor according to claim 3, it is characterized in that: described spool axial hole (41a) is shaped on first damping hole (41b), and the import of spool axial hole (41a) is gradually little funneling taper hole (41c).
5. a kind of buffering type relief valve that is used for oil hydraulic motor according to claim 4, it is characterized in that: be shaped on boss face (412a) on the described valve rod (412), boss face (412a) cutting ferrule apical grafting has pressure pad (6), and the front end of described pressure spring (42) pushes up with spool (41) mutually through pressure pad (6) joins.
6. a kind of buffering type relief valve that is used for oil hydraulic motor according to claim 5, it is characterized in that: described valve seat (2) fixedly is fitted in the front end of valve pocket (3), valve seat (2) is shaped on the attachment hole (21) that is communicated with valve body filler opening (P) and spool axial hole (41a), and attachment hole (21) expansion is shaped on the circular arc camber hole of matching with sealing bulb (413) sealing of valve head (411).
7. a kind of buffering type relief valve that is used for oil hydraulic motor according to claim 6, it is characterized in that: described plug screw (7) fixing seal is installed in the left port of valve body (1), and plug screw (7) is shaped on the pilot hole that contains internal thread, the outside thread of described adjusting bolt (43) is connected with the internal thread spiral of pilot hole and matches, and the reaming table top (7a) of the ear end face of described valve pocket (3) and pilot hole is apical grafting mutually.
8. a kind of buffering type relief valve that is used for oil hydraulic motor according to claim 7, it is characterized in that: described damper piston (5) periphery wall matches with sliding chamber (11) the inner circle wall slipper seal of valve body, and the sliding chamber (11) of valve body right-hand member wall has the oil duct (12) that is communicated with valve body return opening (T).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102322472A CN102235393A (en) | 2011-08-15 | 2011-08-15 | Buffer relief valve for hydraulic motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102322472A CN102235393A (en) | 2011-08-15 | 2011-08-15 | Buffer relief valve for hydraulic motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102235393A true CN102235393A (en) | 2011-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102322472A Pending CN102235393A (en) | 2011-08-15 | 2011-08-15 | Buffer relief valve for hydraulic motor |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678645A (en) * | 2012-05-31 | 2012-09-19 | 常德中联重科液压有限公司 | Direct-acting overflow valve, direct-acting overflow valve group and hydraulic overflow loop |
| CN102734249A (en) * | 2012-07-18 | 2012-10-17 | 严光贤 | Overload valve |
| CN102874244A (en) * | 2012-10-22 | 2013-01-16 | 张小伟 | Pneumatic automatic control valve for braking |
| CN103104567A (en) * | 2013-01-11 | 2013-05-15 | 西南交通大学 | Double-piston independent damping vibration attenuation pressure regulating device |
| CN103244492A (en) * | 2012-12-29 | 2013-08-14 | 柳州柳工液压件有限公司 | Tee-joint pressure compensator of metering pump load-sensitive hydraulic system |
| CN103899463A (en) * | 2014-03-28 | 2014-07-02 | 哈尔滨工程大学 | Multi-stage buffer type relief valve |
| CN107559257A (en) * | 2017-09-11 | 2018-01-09 | 雷沃重工股份有限公司 | A kind of overflow valve |
| CN108050119A (en) * | 2017-12-29 | 2018-05-18 | 常熟华威履带有限公司 | A kind of excavator buffer overflow valve |
| CN108061069A (en) * | 2017-12-19 | 2018-05-22 | 宁波文泽机电技术开发有限公司 | Buffer overflow valve |
| CN108105192A (en) * | 2017-12-19 | 2018-06-01 | 宁波文泽机电技术开发有限公司 | A kind of buffer-braking valve |
| CN108150472A (en) * | 2017-12-27 | 2018-06-12 | 邵立坤 | A kind of buffer overflow valve |
| CN108150473A (en) * | 2017-12-27 | 2018-06-12 | 邵立坤 | A kind of buffer overflow valve |
| CN108167253A (en) * | 2017-12-27 | 2018-06-15 | 邵立坤 | Buffer overflow valve |
| CN109058208A (en) * | 2018-10-17 | 2018-12-21 | 邵玉刚 | A kind of buffer overflow valve |
| CN109900417A (en) * | 2019-02-19 | 2019-06-18 | 武汉中航传感技术有限责任公司 | A kind of spring pressure buffer device and pressure sensor |
| CN113738635A (en) * | 2021-09-15 | 2021-12-03 | 北京华德液压工业集团有限责任公司 | Plunger structure of plunger type hydraulic pump and plunger type hydraulic pump comprising same |
| CN113883326A (en) * | 2021-10-28 | 2022-01-04 | 中国船舶重工集团衡远科技有限公司 | Pressurizing delay device |
| CN113915183A (en) * | 2021-09-13 | 2022-01-11 | 烟台艾迪液压科技有限公司 | Overflow valve with adjustable buffer function |
| CN114278771A (en) * | 2020-09-28 | 2022-04-05 | 江苏二马液压元件有限公司 | Area-variable direct-acting overflow valve |
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| CN201428668Y (en) * | 2009-06-23 | 2010-03-24 | 上海立新液压有限公司 | Balance valve with secondary pressure overflow |
| US20100327208A1 (en) * | 2005-01-31 | 2010-12-30 | Doutt Michael L | Three-way poppet valve with internal check feature |
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| JPH05180354A (en) * | 1991-12-30 | 1993-07-20 | Kayaba Ind Co Ltd | Relief valve |
| JPH10122401A (en) * | 1996-10-14 | 1998-05-15 | Kayaba Ind Co Ltd | Pressure rising buffer mechanism for relief valve |
| US20100327208A1 (en) * | 2005-01-31 | 2010-12-30 | Doutt Michael L | Three-way poppet valve with internal check feature |
| CN201428668Y (en) * | 2009-06-23 | 2010-03-24 | 上海立新液压有限公司 | Balance valve with secondary pressure overflow |
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678645A (en) * | 2012-05-31 | 2012-09-19 | 常德中联重科液压有限公司 | Direct-acting overflow valve, direct-acting overflow valve group and hydraulic overflow loop |
| CN102678645B (en) * | 2012-05-31 | 2014-10-29 | 常德中联重科液压有限公司 | Direct-acting overflow valve, direct-acting overflow valve group and hydraulic overflow loop |
| CN102734249A (en) * | 2012-07-18 | 2012-10-17 | 严光贤 | Overload valve |
| CN102734249B (en) * | 2012-07-18 | 2015-05-20 | 严光贤 | Overload valve |
| CN102874244A (en) * | 2012-10-22 | 2013-01-16 | 张小伟 | Pneumatic automatic control valve for braking |
| CN103244492A (en) * | 2012-12-29 | 2013-08-14 | 柳州柳工液压件有限公司 | Tee-joint pressure compensator of metering pump load-sensitive hydraulic system |
| CN103104567A (en) * | 2013-01-11 | 2013-05-15 | 西南交通大学 | Double-piston independent damping vibration attenuation pressure regulating device |
| CN103104567B (en) * | 2013-01-11 | 2015-08-05 | 西南交通大学 | A kind of double-piston independence damping vibration attenuation voltage adjusting device |
| CN103899463A (en) * | 2014-03-28 | 2014-07-02 | 哈尔滨工程大学 | Multi-stage buffer type relief valve |
| CN103899463B (en) * | 2014-03-28 | 2016-05-04 | 哈尔滨工程大学 | Multi-stage buffer type overflow valve |
| CN107559257A (en) * | 2017-09-11 | 2018-01-09 | 雷沃重工股份有限公司 | A kind of overflow valve |
| CN108105192B (en) * | 2017-12-19 | 2019-11-15 | 浙江百思达水暖股份有限公司 | A kind of buffer-braking valve |
| CN108061069A (en) * | 2017-12-19 | 2018-05-22 | 宁波文泽机电技术开发有限公司 | Buffer overflow valve |
| CN108105192A (en) * | 2017-12-19 | 2018-06-01 | 宁波文泽机电技术开发有限公司 | A kind of buffer-braking valve |
| CN108150472B (en) * | 2017-12-27 | 2019-11-15 | 浙江百思达水暖股份有限公司 | A kind of buffer overflow valve |
| CN108167253A (en) * | 2017-12-27 | 2018-06-15 | 邵立坤 | Buffer overflow valve |
| CN108150473A (en) * | 2017-12-27 | 2018-06-12 | 邵立坤 | A kind of buffer overflow valve |
| CN108150473B (en) * | 2017-12-27 | 2019-07-23 | 凯文斯流体控制(江苏)有限公司 | A kind of buffer overflow valve |
| CN108150472A (en) * | 2017-12-27 | 2018-06-12 | 邵立坤 | A kind of buffer overflow valve |
| CN108050119A (en) * | 2017-12-29 | 2018-05-18 | 常熟华威履带有限公司 | A kind of excavator buffer overflow valve |
| CN109058208B (en) * | 2018-10-17 | 2020-05-22 | 浙江奥诗柯流体控制股份有限公司 | Buffer overflow valve |
| CN109058208A (en) * | 2018-10-17 | 2018-12-21 | 邵玉刚 | A kind of buffer overflow valve |
| CN109900417A (en) * | 2019-02-19 | 2019-06-18 | 武汉中航传感技术有限责任公司 | A kind of spring pressure buffer device and pressure sensor |
| CN109900417B (en) * | 2019-02-19 | 2024-02-20 | 武汉中航传感技术有限责任公司 | Spring type pressure buffer device and pressure sensor |
| CN114278771A (en) * | 2020-09-28 | 2022-04-05 | 江苏二马液压元件有限公司 | Area-variable direct-acting overflow valve |
| CN113915183A (en) * | 2021-09-13 | 2022-01-11 | 烟台艾迪液压科技有限公司 | Overflow valve with adjustable buffer function |
| CN113738635A (en) * | 2021-09-15 | 2021-12-03 | 北京华德液压工业集团有限责任公司 | Plunger structure of plunger type hydraulic pump and plunger type hydraulic pump comprising same |
| CN113883326A (en) * | 2021-10-28 | 2022-01-04 | 中国船舶重工集团衡远科技有限公司 | Pressurizing delay device |
| CN113883326B (en) * | 2021-10-28 | 2024-06-04 | 中国船舶重工集团衡远科技有限公司 | Supercharging time-delay device |
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Application publication date: 20111109 |