CN109114060B - A valve - Google Patents
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- CN109114060B CN109114060B CN201811134294.1A CN201811134294A CN109114060B CN 109114060 B CN109114060 B CN 109114060B CN 201811134294 A CN201811134294 A CN 201811134294A CN 109114060 B CN109114060 B CN 109114060B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/024—Pressure relief valves
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- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
- Lift Valve (AREA)
Abstract
The invention proposes a valve comprising: the valve comprises a valve body, a threaded sleeve, an adjusting rod, an unloading valve core, an unloading spring, an overflow valve core, an overflow spring, a first spring seat, a one-way valve core and a one-way spring. The valve provided by the embodiment of the invention has the advantages of compact volume, simplicity in processing and low manufacturing cost, and can be used for unloading the duplex hydraulic pump.
Description
Technical Field
The present invention relates to a valve.
Background
The duplex hydraulic pump is usually used in a special machine tool for machining with the requirements of quick feeding and working feeding, and the duplex pump consists of a high-pressure small-flow hydraulic pump and a low-pressure large-flow hydraulic pump. When the hydraulic pump is used for feeding oil, the two hydraulic pumps supply oil at the same time (the pressure is lower at the moment), when the hydraulic pump is used for feeding oil, the hydraulic pump with high pressure and small flow rate supplies oil (the pressure is higher at the moment), and meanwhile, the large-flow pump is unloaded on an oil circuit system. In the prior art, an unloading valve group is usually adopted to control a duplex hydraulic pump to be switched from quick feed to working feed so as to unload a low-pressure large-flow pump, and the existing unloading valve group is generally integrated on a valve block by an independent one-way valve, an overflow valve and an unloading valve, so that the unloading valve group is large in size and high in cost.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, an object of the present invention is to propose a valve that can be used for unloading a double hydraulic pump, which is compact, simple to machine and inexpensive to manufacture.
A valve according to an embodiment of the invention, comprising:
the valve body is provided with a valve body through hole which is communicated up and down, the valve body through hole comprises a first valve body through hole section, a second valve body through hole section, a third valve body through hole section, a fourth valve body through hole section and a fifth valve body through hole section from top to bottom, the aperture of the second valve body through hole section is larger than that of the fourth valve body through hole section, the aperture of the first valve body through hole section, the aperture of the third valve body through hole section and the aperture of the fifth valve body through hole section are all larger than that of the second valve body through hole section, the valve body is provided with a first oil port, a first through hole and a second through hole, the first oil port T is communicated with the third valve body through hole section, the first through hole is communicated with the fourth valve body through hole section, the second through hole is communicated with the fifth valve body through hole section, and the inner opening of the second through hole is adjacent to the lower step surface of the fourth valve body through hole section, the first through-flow hole and the second through-flow hole form a second oil port;
the lower end of the threaded sleeve is in threaded fit in the first valve body through hole section, the upper end of the threaded sleeve protrudes upwards out of the upper end face of the valve body, the lower end face of the threaded sleeve is spaced from the upper step face of the second valve body through hole section by a preset distance, the threaded sleeve is provided with a threaded sleeve through hole which is communicated up and down, the threaded sleeve through hole comprises a first threaded sleeve through hole section and a second threaded sleeve through hole section from top to bottom, and the aperture of the first threaded sleeve through hole section is smaller than that of the second threaded sleeve through hole section;
the adjusting rod is in threaded fit in the first thread sleeve through hole section, and the upper end of the adjusting rod protrudes upwards from the upper surface of the thread sleeve;
the unloading valve core comprises a first unloading valve core section which can be matched in the through hole section of the second valve body in a vertically sliding manner, a second unloading valve core section which can be matched in the through hole section of the fourth valve body in a vertically sliding manner, and an unloading valve core connecting section which is positioned between the first unloading valve core section and the second unloading valve core section, the outer diameter of the unloading valve core connecting section is between the outer diameter of the first unloading valve core section and the outer diameter of the second unloading valve core section, the first unloading valve core section is provided with an unloading valve core blind hole with an upward opening, the unloading valve core blind hole comprises a main body blind hole section and a reducing blind hole section which is positioned below the main body blind hole section, the unloading valve core is provided with a first flow channel, a second flow channel and a third flow channel, and the first flow channel is communicated with the inner peripheral wall of the main body blind hole section and the outer peripheral wall of the unloading valve core connecting section, the second flow channel is communicated with the diameter-reducing blind hole section and the lower end face of the unloading valve core, the third flow channel is formed on the second unloading valve core section, the first end of the third flow channel is normally communicated with the first through hole, and the second end of the third flow channel is adjacent to the lower step face of the unloading valve core connecting section;
the upper end of the unloading spring abuts against the upper step surface of the second thread sleeve through hole section in the second thread sleeve through hole section, the lower end of the unloading spring abuts against the upper end surface of the unloading valve core, the unloading spring normally pushes the unloading valve core downwards so that the lower step surface of the unloading valve core connecting section normally closes the upper opening of the fourth valve body through hole section, and at the moment, the lower end of the second unloading valve core section extends downwards into the fifth valve body through hole section;
the overflow valve core comprises an overflow valve core main body section which can be matched in the main body blind hole section in a vertically sliding manner and an overflow valve core reducing section which is positioned below the overflow valve core main body section, and the outer diameter of the overflow valve core reducing section is larger than the aperture of the reducing blind hole section;
the overflow spring is arranged in the unloading spring, the upper end of the overflow spring abuts against the lower end of the adjusting rod, the lower end of the overflow spring abuts against the upper end of the overflow valve core, and the overflow spring pushes the overflow valve core downwards normally so that the lower end face of the reducing section of the overflow valve core normally seals the upper opening of the reducing blind hole section;
the first spring seat is fixedly arranged in the fifth valve body through hole section;
the check valve core comprises a check valve core sliding section which can be matched in the through hole section of the fifth valve body in a vertically sliding mode and a check valve core reducing section which is positioned below the check valve core sliding section and matched in the first spring seat in a vertically moving mode, the check valve core is provided with a check valve core through hole which is communicated vertically, the aperture of the check valve core through hole is smaller than that of the fourth valve body through hole, and a third oil port is formed by the lower opening of the check valve core through hole;
the check valve core is sleeved on the reducing section of the check valve core, the upper end of the check valve core abuts against the lower end face of the sliding section of the check valve core, the lower end of the check spring abuts against the first spring seat, when the lower end of the second unloading valve core section extends downwards into the fifth valve body through hole section, the check spring normally pushes the check valve core upwards to enable the upper end face of the check valve core to abut against the lower end face of the second unloading valve core section, and when the lower end of the second unloading valve core section retracts upwards into the fifth valve body through hole section, the check spring normally pushes the check valve core upwards to enable the upper end face of the check valve core to abut against the lower step face of the fourth valve body through hole section.
Advantageously, the valve further comprises a retainer ring disposed between an inner peripheral wall of the fifth valve body through-hole section and an outer peripheral wall of the first spring seat to secure the first spring seat within the fifth valve body through-hole section.
Advantageously, the valve further comprises a second spring seat disposed between the lower end of the adjustment stem and the upper end of the relief spring.
Advantageously, the lower end of the unloading valve core connecting section is in a circular truncated cone shape with the outer diameter increasing from bottom to top in sequence.
Advantageously, the lower end of the second unloading valve core section is in a circular truncated cone shape with the outer diameter increasing from bottom to top.
Advantageously, the lower end of the reducing section of the relief valve core is in a circular truncated cone shape with the outer diameter increasing from bottom to top.
Advantageously, the peripheral wall of the second relief valve core segment has a through-flow groove, and the through-flow groove communicates the first through-flow hole with the first end of the third flow passage.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a valve according to an embodiment of the present invention;
FIG. 2 is a hydraulic schematic of a valve according to an embodiment of the present invention;
FIG. 3 is a hydraulic schematic of one application scenario of a valve according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A valve according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 3, a valve according to an embodiment of the present invention includes: the valve comprises a valve body 1, a threaded sleeve 2, an adjusting rod 10, an unloading valve core 4, an unloading spring 11, an overflow valve core 3, an overflow spring 12, a first spring seat 6, a one-way valve core 7 and a one-way spring 8.
Specifically, the valve body 1 has a valve body through hole which is through from top to bottom, the valve body through hole includes a first valve body through hole section, a second valve body through hole section, a third valve body through hole section, a fourth valve body through hole section and a fifth valve body through hole section from top to bottom, the aperture of the second valve body through hole section is larger than that of the fourth valve body through hole section, and the aperture of the first valve body through hole section, the aperture of the third valve body through hole section and the aperture of the fifth valve body through hole section are all larger than that of the second valve body through hole section. The valve body 1 is provided with a first oil port T, a first through-flow hole 101 and a second through-flow hole 102, the first oil port T is communicated with the third valve body through-flow section, the first through-flow hole 101 is communicated with the fourth valve body through-flow section, and the second through-flow hole 102 is communicated with the fifth valve body through-flow section, and the inner opening of the second through-flow hole 102 is adjacent to the lower step surface of the fourth valve body through-flow section. The first through-flow hole 101 and the second through-flow hole 102 constitute a second port P.
The lower end of the threaded sleeve 2 is in threaded fit with the first valve body through hole section, the upper end of the threaded sleeve 2 protrudes upwards from the upper end face of the valve body 1, the lower end face of the threaded sleeve 2 is spaced from the upper step face of the second valve body through hole section by a preset distance, the threaded sleeve 2 is provided with a threaded sleeve through hole which is communicated up and down, the threaded sleeve through hole comprises a first threaded sleeve through hole section and a second threaded sleeve through hole section from top to bottom, and the aperture of the first threaded sleeve through hole section is smaller than that of the second threaded sleeve through hole section.
The adjusting rod 10 is in threaded fit in the first thread sleeve through hole section, and the upper end of the adjusting rod 10 protrudes upwards from the upper surface of the thread sleeve 2.
The unloading valve core 4 comprises a first unloading valve core section which can be matched in the through hole section of the second valve body in a vertically sliding manner, a second unloading valve core section which can be matched in the through hole section of the fourth valve body in a vertically sliding manner, and an unloading valve core connecting section which is positioned between the first unloading valve core section and the second unloading valve core section, wherein the outer diameter of the unloading valve core connecting section is between the outer diameter of the first unloading valve core section and the outer diameter of the second unloading valve core section. The first unloading valve core section is provided with an unloading valve core blind hole with an upward opening, and the unloading valve core blind hole comprises a main body blind hole section and a reducing blind hole section positioned below the main body blind hole section. A first flow passage 401, a second flow passage 402, and a third flow passage 403 in the unloading spool 4. The first flow channel 401 is communicated with the inner peripheral wall of the main body blind hole section and the outer peripheral wall of the unloading valve core connecting section, the second flow channel 402 is communicated with the reducing blind hole section and the lower end face of the unloading valve core 4, the third flow channel 403 is formed on the second unloading valve core section, the first end of the third flow channel 403 is normally communicated with the first through hole 101, and the second end of the third flow channel 403 is adjacent to the lower step face of the unloading valve core connecting section. Advantageously, the outer peripheral wall of the second relief spool segment has a through-flow groove 404, and the through-flow groove 404 communicates the first through-flow hole 101 with the first end of the third flow channel 403. Advantageously, the lower end of the unloading valve core connecting section is in a circular truncated cone shape with the outer diameter increasing from bottom to top; the lower end of the second unloading valve core section is in a circular truncated cone shape, and the outer diameter of the circular truncated cone shape is sequentially increased from bottom to top.
The upper end of the unloading spring 11 is abutted against the upper step surface of the second thread sleeve through hole section in the second thread sleeve through hole section, and the lower end of the unloading spring 11 is abutted against the upper end surface of the unloading valve core 4. The unloading spring 11 normally pushes the unloading valve core 4 downwards so that the lower step surface of the unloading valve core connecting section normally closes the upper opening of the fourth valve body through hole section. At the moment, the lower end of the second unloading valve core section extends downwards into the fifth valve body through hole section.
The overflow valve core 3 comprises an overflow valve core main body section which can be matched in the main body blind hole section in a vertically sliding manner and an overflow valve core reducing section which is positioned below the overflow valve core main body section, and the outer diameter of the overflow valve core reducing section is larger than the aperture of the reducing blind hole section. Advantageously, the lower end of the reducing section of the relief valve core is in a circular truncated cone shape with the outer diameter increasing from bottom to top.
The overflow spring 12 is arranged in the unloading spring 11, the upper end of the overflow spring 12 abuts against the lower end of the adjusting rod 10, the lower end of the overflow spring 12 abuts against the upper end of the overflow valve core 3, and the overflow spring 12 pushes the overflow valve core 3 downwards normally so that the lower end face of the reducing section of the overflow valve core normally seals the upper opening of the reducing blind hole section. Advantageously, said valve also comprises a second spring seat 5, the second spring seat 5 being provided between the lower end of the regulating rod 10 and the upper end of the overflow spring 12.
And the first spring seat 6 is fixedly arranged in the fifth valve body through hole section. Advantageously, the valve further comprises a retainer ring 9, the retainer ring 9 being provided between an inner peripheral wall of the fifth valve body through-hole section and an outer peripheral wall of the first spring seat 6 to fix the first spring seat 6 in the fifth valve body through-hole section.
The check valve core 7 comprises a check valve core sliding section which can be matched in the fifth valve body through hole section in an up-and-down sliding mode and a check valve core reducing section which is positioned below the check valve core sliding section and matched in the first spring seat 6 in an up-and-down moving mode, the check valve core 7 is provided with a check valve core through hole which is communicated up and down, the aperture of the check valve core through hole is smaller than that of the fourth valve body through hole, and the lower opening of the check valve core through hole forms a third oil port A.
The one-way spring 8 is sleeved on the reducing section of the one-way valve core, the upper end of the one-way valve core 7 abuts against the lower end face of the sliding section of the one-way valve core, and the lower end of the one-way spring 8 abuts against the first spring seat 6. When the lower end of the second unloading valve core section extends downwards into the fifth valve body through hole section, the one-way spring 8 normally pushes the one-way valve core 7 upwards to enable the upper end face of the one-way valve core 7 to abut against the lower end face of the second unloading valve core section. When the lower end of the second unloading valve core section is upwards retracted into the fifth valve body through hole section, the one-way spring 8 normally pushes the one-way valve core 7 upwards so that the upper end surface of the one-way valve core 7 abuts against the lower step surface of the fourth valve body through hole section.
The operation of a valve according to an embodiment of the invention will be briefly described.
As shown in fig. 3, in application, the second port P is connected to the outlet of the low-pressure large-flow pump 15, the third port a is connected to the outlet of the high-pressure small-flow hydraulic pump 14, and the first port T is directly connected to the oil tank 13. The pre-tightening force of the unloading spring 11 can be changed by adjusting the threaded sleeve 2, so that the unloading pressure is set; the pre-stressing of the overflow spring 12 can be varied by adjusting the adjusting lever 10, so that the overflow pressure is set.
When the motor is started to drive the duplex hydraulic pump to rotate, oil at the outlet of the low-pressure large-flow hydraulic pump 15 reaches the second oil port P, acts on the one-way valve core 7 through the second through-flow hole 102, overcomes the acting force of the one-way spring 8 to push the one-way valve core 7 to move downwards to open the upper opening of the through hole of the one-way valve core (because the acting force of the unloading spring 11 is larger than the acting force of the one-way spring 8), enters the third oil port A, and meanwhile, oil at the outlet of the high-pressure small-flow pump 14 also enters the third oil port A to realize quick feeding, and the pressure of the third oil. When the rapid feeding is finished and the machine tool contacts the workpiece to enable the pressure of the third oil port A to rise to the unloading pressure, the pressure oil of the third port a pushes the unloading valve core 4 to overcome the acting force of the unloading spring 11 to open the upper opening of the through hole section of the fourth valve body upwards, so that the third flow passage 403 is communicated with the first port T, the oil of the second port P flows into the first port T through the first through hole 101, the through groove 404 and the third flow passage 403 in sequence to be unloaded, and meanwhile, because a pressure difference is generated between the third port a and the second port P (namely, the pressure of the third port a is greater than that of the second port P), under the action of the one-way spring 8 and the oil pressure of the third oil port A, the one-way valve core 7 moves upwards to enable the upper end surface of the one-way valve core 7 to abut against the lower step surface of the through hole section of the fourth valve body, thereby closing the upper opening of the through hole of the one-way valve core, and the second oil port P is blocked and not communicated with the third oil port A. The duplex hydraulic pump enters the working feeding working condition, only the high-pressure small-flow hydraulic pump 14 supplies oil to the third oil port A, the pressure of the third oil port A can reach higher pressure, when the third flow passage 403 is completely communicated with the first port T, the upper end surface of the check valve core 7 contacts with the lower step surface of the through hole section of the fourth valve body to realize the sealing and separation of the third port a and the second port P, the pressure of the third port a makes the unloading valve core 4 always in an open unloading state, when the pressure of the third oil port a exceeds the pressure set by the overflow spring 12 under the working feeding working condition, the oil of the third oil port a pushes the overflow valve core 3 to move upwards by the second flow passage 402 to open the upper opening of the reducing blind hole section, so that the oil of the third oil port a overflows to the first oil port T through the second flow passage 402, the reducing blind hole section and the first flow passage 401, and the safety protection effect is achieved.
The invention has the advantages that through the design of a plug-in type structure, the unidirectional function, the unloading function and the overflow function are integrated together, the volume is compact, the structure is simple and reasonable, and the manufacturing cost is low.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although the embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the embodiments without departing from the scope of the present invention.
Claims (7)
1. A valve, comprising:
the valve body is provided with a valve body through hole which is communicated up and down, the valve body through hole comprises a first valve body through hole section, a second valve body through hole section, a third valve body through hole section, a fourth valve body through hole section and a fifth valve body through hole section from top to bottom, the aperture of the second valve body through hole section is larger than that of the fourth valve body through hole section, the aperture of the first valve body through hole section, the aperture of the third valve body through hole section and the aperture of the fifth valve body through hole section are all larger than that of the second valve body through hole section, the valve body is provided with a first oil port, a first through hole and a second through hole, the first oil port is communicated with the third valve body through hole section, the first through hole is communicated with the fourth valve body through hole section, the second through hole is communicated with the fifth valve body through hole section, and the inner opening of the second through hole is adjacent to the lower step surface of the fourth valve body through hole section, the first through-flow hole and the second through-flow hole form a second oil port;
the lower end of the threaded sleeve is in threaded fit in the first valve body through hole section, the upper end of the threaded sleeve protrudes upwards out of the upper end face of the valve body, the lower end face of the threaded sleeve is spaced from the upper step face of the second valve body through hole section by a preset distance, the threaded sleeve is provided with a threaded sleeve through hole which is communicated up and down, the threaded sleeve through hole comprises a first threaded sleeve through hole section and a second threaded sleeve through hole section from top to bottom, and the aperture of the first threaded sleeve through hole section is smaller than that of the second threaded sleeve through hole section;
the adjusting rod is in threaded fit in the first thread sleeve through hole section, and the upper end of the adjusting rod protrudes upwards from the upper surface of the thread sleeve;
the unloading valve core comprises a first unloading valve core section which can be matched in the through hole section of the second valve body in a vertically sliding manner, a second unloading valve core section which can be matched in the through hole section of the fourth valve body in a vertically sliding manner, and an unloading valve core connecting section which is positioned between the first unloading valve core section and the second unloading valve core section, the outer diameter of the unloading valve core connecting section is between the outer diameter of the first unloading valve core section and the outer diameter of the second unloading valve core section, the first unloading valve core section is provided with an unloading valve core blind hole with an upward opening, the unloading valve core blind hole comprises a main body blind hole section and a reducing blind hole section which is positioned below the main body blind hole section, the unloading valve core is provided with a first flow channel, a second flow channel and a third flow channel, and the first flow channel is communicated with the inner peripheral wall of the main body blind hole section and the outer peripheral wall of the unloading valve core connecting section, the second flow channel is communicated with the diameter-reducing blind hole section and the lower end face of the unloading valve core, the third flow channel is formed on the second unloading valve core section, the first end of the third flow channel is normally communicated with the first through hole, and the second end of the third flow channel is adjacent to the lower step face of the unloading valve core connecting section;
the upper end of the unloading spring abuts against the upper step surface of the second thread sleeve through hole section in the second thread sleeve through hole section, the lower end of the unloading spring abuts against the upper end surface of the unloading valve core, the unloading spring normally pushes the unloading valve core downwards so that the lower step surface of the unloading valve core connecting section normally closes the upper opening of the fourth valve body through hole section, and at the moment, the lower end of the second unloading valve core section extends downwards into the fifth valve body through hole section;
the overflow valve core comprises an overflow valve core main body section which can be matched in the main body blind hole section in a vertically sliding manner and an overflow valve core reducing section which is positioned below the overflow valve core main body section, and the outer diameter of the overflow valve core reducing section is larger than the aperture of the reducing blind hole section;
the overflow spring is arranged in the unloading spring, the upper end of the overflow spring abuts against the lower end of the adjusting rod, the lower end of the overflow spring abuts against the upper end of the overflow valve core, and the overflow spring pushes the overflow valve core downwards normally so that the lower end face of the reducing section of the overflow valve core normally seals the upper opening of the reducing blind hole section;
the first spring seat is fixedly arranged in the fifth valve body through hole section;
the check valve core comprises a check valve core sliding section which can be matched in the through hole section of the fifth valve body in a vertically sliding mode and a check valve core reducing section which is positioned below the check valve core sliding section and matched in the first spring seat in a vertically moving mode, the check valve core is provided with a check valve core through hole which is communicated vertically, the aperture of the check valve core through hole is smaller than that of the through hole section of the fourth valve body, and a third oil port is formed by the lower opening of the check valve core through hole;
the check valve core comprises a first unloading valve core section, a second unloading valve core section, a check spring, a check valve core reducing section and a check valve core sliding section, wherein the check valve core reducing section is sleeved with the check spring, the upper end of the check spring abuts against the lower end face of the check valve core sliding section, the lower end of the check spring abuts against the first spring seat, when the lower end of the second unloading valve core section extends downwards into the fifth valve body through hole section, the check spring normally pushes the check valve core upwards to enable the upper end face of the check valve core to abut against the lower end face of the second unloading valve core section, and when the lower end of the second unloading valve core section retracts upwards into the fourth valve body through hole section, the check spring normally pushes the check valve core upwards to enable the upper end face of the check valve core to abut against the lower step face of the fourth valve body through hole.
2. A valve as defined in claim 1, further comprising a retainer ring disposed between an inner peripheral wall of the fifth valve body through-bore section and an outer peripheral wall of the first spring seat to retain the first spring seat within the fifth valve body through-bore section.
3. A valve as defined in claim 1, further comprising a second spring seat disposed between a lower end of said adjustment stem and an upper end of said spill spring.
4. The valve of claim 1, wherein the lower end of the unloading valve core connecting section is configured into a circular truncated cone shape with the outer diameter increasing from bottom to top.
5. The valve of claim 1, wherein the lower end of the second unloader spool segment is configured in the shape of a truncated cone having an outer diameter that increases from bottom to top.
6. The valve of claim 1, wherein the lower end of the relief valve core reducing section is configured in a truncated cone shape with an outer diameter increasing from bottom to top.
7. The valve of claim 1, wherein the peripheral wall of the second unloader spool segment has a through-flow groove therein, the through-flow groove communicating the first through-flow aperture with the first end of the third flow passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811134294.1A CN109114060B (en) | 2018-09-27 | 2018-09-27 | A valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811134294.1A CN109114060B (en) | 2018-09-27 | 2018-09-27 | A valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109114060A CN109114060A (en) | 2019-01-01 |
| CN109114060B true CN109114060B (en) | 2020-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811134294.1A Active CN109114060B (en) | 2018-09-27 | 2018-09-27 | A valve |
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| CN (1) | CN109114060B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111660439B (en) * | 2020-06-16 | 2022-06-24 | 邵立坤 | Motor control device for concrete mixer truck |
| CN114484014A (en) * | 2022-01-24 | 2022-05-13 | 浙江大学 | Liquid pump pressure control valve |
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| CN107152428A (en) * | 2017-06-15 | 2017-09-12 | 上海诺玛液压系统有限公司 | A kind of highly integrated SERVO CONTROL ultrahigh pressure proportional inserted valve |
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| DE19605557A1 (en) * | 1996-02-15 | 1997-08-21 | Rexroth Mannesmann Gmbh | Valve cartridge |
| GB9914264D0 (en) * | 1998-06-30 | 1999-08-18 | Eaton Corp | Cartridge valve having solenoid bypass and integral relief valve |
| CN201144905Y (en) * | 2007-12-28 | 2008-11-05 | 上海立新液压有限公司 | Cover board type two-way cartridge inserted valve |
| CN104131824A (en) * | 2014-08-08 | 2014-11-05 | 霍州煤电集团霍源通新产业投资有限公司 | Inserted hydraulic valve |
| CN106051186A (en) * | 2016-08-13 | 2016-10-26 | 李军 | Flow type balance valve provided with cushion valve |
| CN106224607A (en) * | 2016-09-26 | 2016-12-14 | 东洋重工机（大连）有限公司 | A kind of screw thread high pressure inserted valve |
| CN107152428A (en) * | 2017-06-15 | 2017-09-12 | 上海诺玛液压系统有限公司 | A kind of highly integrated SERVO CONTROL ultrahigh pressure proportional inserted valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109114060A (en) | 2019-01-01 |
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