CN112747001A - Pilot-operated overflow valve with position feedback - Google Patents
Pilot-operated overflow valve with position feedback Download PDFInfo
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- CN112747001A CN112747001A CN202110099178.6A CN202110099178A CN112747001A CN 112747001 A CN112747001 A CN 112747001A CN 202110099178 A CN202110099178 A CN 202110099178A CN 112747001 A CN112747001 A CN 112747001A
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- 238000013016 damping Methods 0.000 claims abstract description 43
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 23
- 238000009434 installation Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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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
- F15B13/029—Counterbalance valves
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Abstract
A pilot-operated overflow valve with position feedback comprises a pilot valve and a main valve, wherein the pilot valve comprises a pilot valve body, a pilot valve core valve sleeve assembly, a pilot spring, a spring seat, a pressure regulating screw and a plug; the pilot valve core valve sleeve component comprises a pilot valve sleeve, a damping plug and a pilot valve core; the pilot valve is sleeved in the pilot valve body; the damping plug is arranged in the pilot valve core, and a damping hole of the damping plug is respectively communicated with the pilot valve sleeve channel and the pilot valve core channel; one side of the pilot valve core is a cone valve or ball valve structure formed by a cone surface or a spherical surface and a pilot valve sleeve, and the other side of the pilot valve core is a sliding end formed by a cylindrical surface and the pilot valve sleeve. The pilot valve opening and closing state is connected with the main valve core through the position of the pilot valve core, so that the control of the action sequence of the main valve core is facilitated, the function that the main valve is opened after the pilot valve is opened is realized, and the abnormal opening phenomenon of the pilot overflow valve when used as a safety valve of an alternating-current hydraulic system can be obviously reduced. Meanwhile, the function of the safety valve for overflowing opening of the pilot overflow valve can be met.
Description
Technical Field
The invention belongs to the field of hydraulic valves, and particularly relates to a pilot-operated overflow valve with position feedback.
Background
The pilot operated overflow valve is widely applied to a hydraulic system due to the characteristics of high pressure regulating precision, large pressure regulating range and the like, and is commonly used as a safety valve, a constant pressure valve, a back pressure valve and the like. In a conventional direct-current hydraulic system, a pilot-operated overflow valve generally has better service performance. However, when used as a relief valve in an ac hydraulic system, although the system pressure is lower than the set pressure of the pilot-operated relief valve, the main valve thereof may have an opening phenomenon at the same frequency as the alternating pressure. The pressure build-up speed of the upper cavity of the main valve is lower than the pressure increase speed of the lower cavity of the main valve, so that the pressure difference exists between the upper end and the lower end of the main valve core under the condition that the pilot valve is not opened. If the differential pressure is sufficient to overcome the main spring precompression force and its friction, the main spool is pushed open, opening the main valve port. The abnormal opening phenomenon of the pilot overflow valve also presents periodicity due to the periodic alternating change of the pressure in the alternating-current hydraulic system. One of the main reasons for the above pressure difference is the damping hole in the pilot-operated relief valve, so that the speed of the pressure build-up in the upper cavity of the main valve cannot follow the pressure change in the lower cavity of the main valve in time. However, the orifice provided in the valve is a basic component for realizing the overflow function of the pilot-operated relief valve and cannot be eliminated. Such abnormal opening increases the energy consumption of the system due to flow loss on the one hand, and reduces the service life of the valve due to increased wear between the main spool and the valve body on the other hand.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a pilot-operated overflow valve with position feedback, which reduces the abnormal opening phenomenon.
The technical scheme of the invention is realized as follows: a pilot overflow valve with position feedback comprises a pilot valve and a main valve, wherein the main valve comprises a main valve body, the main valve body is provided with an inlet, an outlet, a first flow passage and a second flow passage, the first flow passage is communicated with the inlet, and the second flow passage is communicated with the outlet;
the pilot valve comprises a pilot valve body, a pilot valve core valve sleeve assembly, a pilot spring, a spring seat, a pressure regulating screw and a plug, wherein a third flow passage, a fourth flow passage and a fifth flow passage are arranged on the pilot valve body;
the pilot valve core valve sleeve component comprises a pilot valve sleeve, a damping plug and a pilot valve core;
the pilot valve sleeve is fixed in an installation cavity of the pilot valve body, a first channel, a second channel, a third channel, a fourth channel and a second damping hole are arranged on the pilot valve sleeve, the first channel is communicated with the third channel, the fourth channel and the second damping hole are both communicated with the fourth channel, a valve cavity is arranged in the middle of the pilot valve sleeve, the first channel is arranged at one end of the valve cavity, the other end of the pilot valve core, with the diameter smaller than that of the valve cavity, of the pilot valve core is coaxially inserted into the valve cavity from the other end of the valve cavity, and the end, with the diameter larger than that of the valve cavity, of the pilot valve core is arranged outside the valve cavity, so that a first valve port;
the pilot valve core is arranged outside the valve cavity and is a sealing end, the sealing end can seal the first valve port, one end of the pilot valve core arranged in the valve cavity is a sliding end, two convex rings matched with the diameter of the valve cavity are arranged on the outer wall of the sliding end to form two sliding rings, spaces are arranged between the adjacent sliding rings and between the sliding rings and the sealing end to respectively form a first oil cavity and a second oil cavity, the second damping hole is used for communicating the second oil cavity with a fourth flow passage, the sliding rings of the sliding end are matched with the oil ports of a third passage and a fourth passage in size, and the sliding rings of the sliding end are used for controlling the communication between the third passage and the first oil cavity and the communication between the fourth passage and the second oil cavity; the pilot valve core is provided with a first pilot valve core channel, a second pilot valve core channel and a third pilot valve core; a first pilot valve core channel is coaxially arranged in the pilot valve core, the damping plug is coaxially arranged at the opening end of the first pilot valve core channel, a first damping hole is coaxially arranged in the damping plug, the first damping hole communicates the first pilot valve core channel with the first channel, and the second pilot valve core channel and a third pilot valve core communicate with the first pilot valve core channel, the first oil cavity and the second oil cavity respectively;
the sealed end of the pilot valve core is connected with a pressure regulating screw which is in threaded connection with an opening at one end of the pilot valve body installation cavity through a pilot spring, and an opening at the other end of the pilot valve body installation cavity is sealed through a plug.
In this embodiment, the main valve includes a main valve body, a main valve spool, a main valve seat, and a main spring, and the main valve seat is disposed in the main valve body by interference fit; the main valve core is arranged in the main valve seat; the main spring is arranged in the main valve core; the cavity enclosed by the main valve core, the main valve seat and the main valve body at one side of the inlet is a main valve lower cavity, and the cavity enclosed by the main valve core, the main valve seat and the pilot valve body is a main valve upper cavity.
In this embodiment, the pilot valve core and the pilot valve sleeve form a cone valve or a ball valve structure.
In this embodiment, a side of the sealing end of the pilot valve core facing the pilot valve sleeve is a conical surface or a spherical surface, a first valve port is formed between the sealing end surface and a valve cavity of the pilot valve sleeve, a sliding end of the pilot valve core is a cylinder, the sliding end and the pilot valve sleeve are in clearance fit to form a sliding valve structure, and a second valve port and a third valve port are respectively formed between two sliding rings on the sliding end and openings of the second channel and the fourth channel.
In this embodiment, the first channel, the second channel, the third channel, the second valve port, the first oil chamber, the second pilot valve core channel, the first pilot valve core channel, the third pilot valve core channel, the second oil chamber, the third valve port, and the fourth channel form a flow channel I; the first channel, the first damping hole, the first pilot valve core channel, the third pilot valve core channel and the second damping hole form a flow channel II;
when the sealing end of the pilot valve core is contacted with the pilot valve sleeve, the first valve port is closed, the second valve port and the third valve port are opened, and the third flow channel can be communicated with the fourth flow channel through the flow channel I and the flow channel II at the same time;
when the sealing end of the pilot valve core is separated from the pilot valve sleeve, the first valve port is opened, the second valve port and the third valve port respectively close the third channel of the pilot valve sleeve and the fourth channel of the pilot valve sleeve, and the third channel can only be communicated with the fourth channel through the channel II.
In the present embodiment, the pilot valve body and the main valve body are connected by a screw.
In this embodiment, the sealing rings are used for sealing between the pilot valve sleeve and the pilot valve body, between the plug and the pilot valve body, between the main valve seat and the main valve body, between the pilot valve body and the main valve body, and between the pressure regulating screw and the pilot valve body.
By adopting the structure, the set pressure value of the pilot overflow valve is set by the precompression force of the pilot spring set by the pressure regulating screw, when the system pressure is lower than the set pressure value of the pilot spring of the device, the system pressure can not push the pilot valve core, the pilot valve core is in a closed state, at the moment, the upper cavity of the main valve can be communicated with the inlet of the main valve through the flow passage I and also can be communicated with the inlet of the main valve through the flow passage II, the through-flow section of the flow passage I is large, and the flow resistance is very small, so the pressure of the upper cavity of the main valve can quickly follow the pressure change at the inlet of the main valve, the pressure difference between the upper cavity and the lower cavity of the main valve is very small, the main valve core is. When the system pressure is higher than the pilot spring set pressure value of the device, the system pressure pushes the pilot valve core to enable the pilot valve core to be in an opening state, at the moment, the upper cavity of the main valve can be communicated with the inlet of the main valve only through the flow channel II, and meanwhile, as the first valve port is opened, fluid at the inlet of the main valve flows out of the outlet through the first flow channel, the third flow channel, the first damping hole, the first pilot valve core channel, the first valve port, the fifth flow channel and the second flow channel, so that the fluid pressure behind the first damping hole is lower than the fluid pressure in front of the first damping hole k 1. Under the action of this pressure difference, the main spool is pushed upward. At the moment, the main valve is in an open state like the pilot valve, and the safety valve function of overflow opening of the pilot overflow valve is met.
In summary, the present invention links the two states of the pilot valve opening and closing with the main valve core through the position feedback of the pilot valve core, can control the operation sequence of the main valve core, and has the function that the main valve is opened after the pilot valve is opened, that is, the function of significantly reducing the abnormal opening phenomenon of the pilot overflow valve. Meanwhile, the function of the safety valve for overflowing opening of the pilot overflow valve can be met.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural diagram of a valve sleeve assembly of the pilot valve core of the present invention.
In the attached drawings, 1, a main valve body; 2. a main valve element; 3. a main valve seat; 4. a main spring; 5. a plug; 6. a pilot valve body; 7. a pilot valve core valve sleeve assembly; 70. a pilot valve housing; 71. a damping plug; 72. a pilot valve spool; 8. a pilot spring; 9. a spring seat; 10. a pressure regulating screw; p, an inlet; t, an outlet; a. a first flow passage; b. a second flow passage; c. a third flow path; d. a fourth flow path; e. a fifth flow channel; t1, a first channel; t2, a second channel; t3, a third channel; t4, fourth channel; w, a first valve port; u, a second valve port; v, a third valve port; k1, a first orifice; k2, a second orifice; x1, a first pilot spool passage; x2, a second pilot spool passage; x3 and the third pilot valve core.
Detailed Description
The technical content of the present invention will now be further described with reference to the accompanying drawings.
As shown in fig. 1 and 2, a pilot-operated relief valve with position feedback includes a main valve and a pilot valve, wherein the main valve includes a main valve body 1, a main valve core 2, a main valve seat 3, and a main spring 4. The main valve seat 3 is arranged in the main valve body 1 in an interference fit manner; the main valve core 2 is arranged in the main valve seat 3; a main spring 4 is arranged in the main valve element 2; the main valve body 1 is provided with an inlet P, an outlet T, a first flow passage a and a second flow passage b, wherein the first flow passage a is communicated with the inlet P, and the second flow passage b is communicated with the outlet T; a cavity defined by the main valve core 2, the main valve seat 3 and the main valve body 1 at one side of the inlet P is a main valve lower cavity, and a cavity defined by the main valve core 2, the main valve seat 3 and the pilot valve body 6 is a main valve upper cavity;
the pilot valve comprises a pilot valve body 6, a pilot valve core valve sleeve component 7, a pilot spring 8, a spring seat 9, a pressure regulating screw 10 and a plug 5. A third flow channel c, a fourth flow channel d and a fifth flow channel e are arranged on the pilot valve body 6, the third flow channel c is communicated with a first flow channel a in the main valve body 1, the fourth flow channel d is communicated with the upper main valve cavity, and the fifth flow channel e is communicated with a second flow channel b in the main valve body 1;
the pilot valve core valve sleeve assembly 7 comprises a pilot valve sleeve 70, a damping plug 71 and a pilot valve core 72;
the pilot valve sleeve 70 is arranged in the pilot valve body 6 through threaded connection, a first channel t1, a second channel t2, a third channel t3, a fourth channel t4, a first valve port w and a second damping hole k2 are arranged on the pilot valve sleeve 70, the first channel t1 is communicated with the third channel c, the fourth channel t4 and the second damping hole k2 are communicated with the fourth channel d, a valve cavity for installing the pilot valve core 72 is arranged in the middle of the pilot valve sleeve 70, oil ports of the third channel t3 and the fourth channel t4 communicated with the valve cavity are respectively arranged as a second valve port u and a third valve port v, the first channel t1 is arranged at one end of the valve cavity, the first valve port w is arranged at the other end of the valve cavity, one end of the pilot valve core 72 is coaxially arranged in the valve cavity, the other end of the pilot valve core 72 is arranged outside the valve cavity, the sealing end of the pilot valve core 72 faces the conical surface or the spherical surface of the pilot valve cavity, which is larger than the conical surface of the valve cavity, the pilot valve core 72 and the pilot valve sleeve 70 form a cone valve or ball valve structure, an opening between a sealing end and a valve cavity forms a first valve port w, one end of the pilot valve core 72, which is arranged in the valve cavity, is a cylinder with the diameter smaller than that of the valve cavity and is in clearance fit with the pilot valve sleeve 70 to form a sliding end, two convex rings matched with the diameter of the valve cavity are arranged on the outer wall of the sliding end to form two sliding rings, spaces are arranged between adjacent sliding rings and between the sliding rings and the sealing end to respectively form a first oil cavity and a second oil cavity, the second damping hole k2 communicates the second oil cavity with a fourth flow channel d, the space between adjacent sliding rings is matched with the space between a third channel (t3) and a fourth channel (t4), and the sliding rings are used as valves for opening and closing the third channel (t3) and the first oil cavity, the fourth channel (t4) and the second oil cavity; the sliding ring at the sliding end is used for controlling the opening and closing of the second valve port u and the third valve port v, so that the third channel t3 and the fourth channel t4 are controlled to be communicated with the first oil chamber and the second oil chamber respectively; the pilot valve core 72 is provided with a first pilot valve core channel x1, a second pilot valve core channel x2 and a third pilot valve core channel x 3; a first pilot valve core channel x1 is coaxially arranged in the pilot valve core 72, the first pilot valve core channel x1 is a blind hole, the damping plug 71 is coaxially arranged at the opening end of the first pilot valve core channel x1, a first damping hole k1 is coaxially arranged in the damping plug 71, the first damping hole k1 communicates the first pilot valve core channel x1 with the valve cavity, and the second pilot valve core channel x2 and a third pilot valve core channel x3 respectively communicate the first pilot valve core channel x1 with the first oil cavity and the second oil cavity;
the first channel t1, the second channel t2, the third channel t3, the second valve port u, the first oil chamber, the second pilot valve core channel x2, the first pilot valve core channel x1, the third pilot valve core channel x3, the second oil chamber, the third valve port v and the fourth channel t4 form a flow channel I
A first channel t1, a first damping hole k1, a first pilot valve core channel x1, a third pilot valve core channel x3 and a second damping hole k2 form a flow channel II;
when the sealed end of the pilot valve core is contacted with the pilot valve sleeve 70, the first valve port w is closed, the second valve port u and the third valve port v are opened, and the third flow channel c can be communicated with the fourth flow channel d through the flow channel I and the flow channel II at the same time;
when the sealing end of the pilot valve core is separated from the pilot valve sleeve 70, the first valve port w is opened, the second valve port u and the third valve port v respectively close the third channel t3 of the pilot valve sleeve and the fourth channel t4 of the pilot valve sleeve, and the third channel c can only be communicated with the fourth channel d through the channel II;
when the conical surface or the spherical surface of the pilot valve core is contacted with the pilot valve sleeve, the pilot valve is in a closed state;
when the conical surface or the spherical surface of the pilot valve core is separated from the pilot valve sleeve, the pilot valve is in a pilot valve opening state;
the pilot valve body 6 is connected with the main valve body 1 through a screw;
sealing rings are adopted between the pilot valve sleeve 70 and the pilot valve body 6, between the plug 5 and the pilot valve body 6, between the main valve seat 3 and the main valve body 1, between the pilot valve body 6 and the main valve body 1, and between the pressure regulating screw 10 and the pilot valve body 6 for sealing, so that leakage is avoided.
The working principle and process of the present invention will be described below with reference to the pressure change at the main valve inlet P.
When the system pressure is lower than the pilot spring set pressure value of the device, the system pressure cannot push the pilot valve core, the pilot valve core is in a closed state, the first valve port w is closed, and the second valve port u and the third valve port v are opened. In this case, the upper main valve chamber may be connected to the main valve inlet P through the flow passage I, or may be connected to the main valve inlet P through the flow passage II. Compared with the flow passage II comprising the first damping hole k1 and the second damping hole k2, the flow passage I has a larger flow cross section and a very small flow resistance. Therefore, the pressure of the upper cavity of the main valve can quickly follow the pressure change of the inlet P of the main valve, so that the pressure difference between the upper cavity and the lower cavity of the main valve is very small, the main valve core is difficult to operate, and the abnormal opening phenomenon of the pilot overflow valve is greatly reduced.
When the system pressure is higher than the pilot spring set pressure value of the device, the system pressure pushes the pilot valve core, so that the pilot valve core is in an open state, the first valve port w is opened, and the second valve ports u and b are closed. At this time, the main valve upper chamber can only communicate with the main valve inlet P through the second damping hole k2, the third pilot spool passage x3, the first pilot spool passage x1, the first damping hole k1, the pilot valve sleeve first passage t1, the third flow passage c, and the first flow passage a. Since the first valve port w is opened, the fluid at the main valve inlet P flows out of the outlet T through the first flow passage a, the third flow passage c, the first orifice k1, the first pilot spool passage x1, the first valve port w, the fifth flow passage e, and the second flow passage b, so that the fluid pressure behind the first orifice k1 is lower than the fluid pressure in front of the first orifice k 1. Under the action of this pressure difference, the main spool is pushed upward. At the moment, the main valve is in an open state like the pilot valve, and the safety valve function of overflow opening of the pilot overflow valve is met.
The pilot overflow valve set pressure value is set by setting the precompression force of the pilot spring 8 by the pressure regulating screw 10.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way, and various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a take position feedback's pilot-operated overflow valve, includes pilot valve and main valve, its characterized in that: the main valve comprises a main valve body (1), a main valve core (2), a main valve seat (3) and a main spring (4), wherein the main valve seat (3) is arranged in the main valve body (1) in an interference fit manner; the main valve core (2) is arranged in the main valve seat (3); the main spring (4) is arranged in the main valve core (2); a cavity defined by the main valve core (2), the main valve seat (3) and the main valve body (1) at one side of the inlet (P) is a main valve lower cavity, a cavity defined by the main valve core (2), the main valve seat (3) and the pilot valve body (6) is a main valve upper cavity, the main valve body (1) is provided with an inlet (P), an outlet (T), a first flow passage (a) and a second flow passage (b), the first flow passage (a) is communicated with the inlet (P), and the second flow passage (b) is communicated with the outlet (T);
the pilot valve comprises a pilot valve body (6), a pilot valve core valve sleeve assembly (7), a pilot spring (8), a spring seat (9), a pressure regulating screw (10) and a plug (5), wherein a third flow channel (c), a fourth flow channel (d) and a fifth flow channel (e) are arranged on the pilot valve body (6), the third flow channel (c) is communicated with an inlet (P) through a first flow channel (a), the fourth flow channel (d) is communicated with an upper cavity of a main valve, and the fifth flow channel (e) is communicated with an outlet (T) through a second flow channel (b);
the pilot valve core valve sleeve assembly (7) comprises a pilot valve sleeve (70), a damping plug (71) and a pilot valve core (72);
the pilot valve sleeve (70) is fixed in an installation cavity of the pilot valve body (6), a first channel (t1), a second channel (t2), a third channel (t3), a fourth channel (t4) and a second damping hole (k2) are arranged on the pilot valve sleeve (70), the first channel (t1) is communicated with a third flow channel (c), the fourth channel (t4) and the second damping hole (k2) are communicated with a fourth flow channel (d), a valve cavity is arranged in the middle of the pilot valve sleeve (70), the first channel (t1) is arranged at one end of the valve cavity, the other end, with the diameter smaller than that of one end of the valve cavity, of the pilot valve core (72) is coaxially inserted into the valve cavity from the other end of the valve cavity, and the end, with the diameter larger than that of the pilot valve core (72) is arranged outside the valve cavity, so that a first valve port (w) is formed between the pilot valve core (72) and the pilot valve sleeve (;
the part of the pilot valve core (72) arranged outside the valve cavity is a sealing end, the sealing end can seal a first valve port (w), the pilot valve core (72) is arranged at one sliding end in the valve cavity, two convex rings matched with the diameter of the valve cavity are arranged on the outer wall of the sliding end to form two sliding rings, spaces are arranged between the adjacent sliding rings and between the sliding rings and the sealing end to respectively form a first oil cavity and a second oil cavity, the second damping hole (k2) is used for communicating the second oil cavity with a fourth flow channel (d), and the sliding rings are used as valves for simultaneously opening and closing a third channel (t3) and the first oil cavity and a fourth channel (t4) and the second oil cavity; a first pilot valve core channel (x1), a second pilot valve core channel (x2) and a third pilot valve core channel (x3) are arranged on the pilot valve core (72); a first pilot valve core channel (x1) is arranged in the pilot valve core (72), the damping plug (71) is coaxially installed at the opening end of the first pilot valve core channel (x1), a first damping hole (k1) is coaxially arranged in the damping plug (71), the first damping hole (k1) communicates the first pilot valve core channel (x1) with the first channel (t1), and the first pilot valve core channel (x1) is respectively communicated with the first oil cavity and the second oil cavity through a second pilot valve core channel (x2) and a third pilot valve core channel (x 3);
the sealed end of pilot valve core (72) passes through pilot spring (8) and is connected with pressure regulating screw (10) on pilot valve body (6) installation cavity one end opening with threaded connection, pilot valve body (6) installation cavity other end opening passes through end cap (5) and seals.
2. The pilot operated relief valve with position feedback of claim 1, characterized in that: the pilot valve core (72) and the pilot valve sleeve (70) form a cone valve or ball valve structure.
3. The pilot operated relief valve with position feedback of claim 1, characterized in that: the side, facing the pilot valve sleeve (70), of the sealing end face of the pilot valve core (72) is a conical surface or a spherical surface, a first valve port (w) is formed between the sealing end face and the valve cavity of the pilot valve sleeve (70), the sliding end of the pilot valve core (72) is a cylinder, the sliding end and the pilot valve sleeve (70) are in clearance fit to form a sliding valve structure, and a second valve port (u) and a third valve port (v) are formed between two sliding rings on the sliding end and openings of a second channel (t2) and a fourth channel (t4) respectively.
4. The pilot operated relief valve with position feedback of claim 3, characterized in that: the first channel (t1), the second channel (t2), the third channel (t3), the second valve port, the first oil chamber, the second pilot valve core channel, the first pilot valve core channel, the third pilot valve core channel, the second oil chamber, the third valve port and the fourth channel (t4) form a flow channel I; the first channel (t1), the first damping hole (k1), the first pilot valve core channel, the third pilot valve core channel and the second damping hole (k2) form a flow channel II;
when the sealing end of the pilot valve core (72) is contacted with the pilot valve sleeve (70), the first valve port (w) is closed, the second valve port and the third valve port are opened, and the third flow channel (c) can be communicated with the fourth flow channel (d) through the flow channel I and the flow channel II at the same time;
when the sealing end of the pilot valve core (72) is separated from the pilot valve sleeve (70), the first valve port (w) is opened, the second valve port and the third valve port respectively close the third channel (t3) of the pilot valve sleeve (70) and the fourth channel (t4) of the pilot valve sleeve (70), and the third flow channel (c) can be communicated with the fourth flow channel (d) only through the flow channel II.
5. The pilot operated relief valve with position feedback of claim 1, characterized in that: the pilot valve body (6) is connected with the main valve body (1) through a screw.
6. The pilot operated relief valve with position feedback according to any one of claims 1 to 5, characterized in that: and sealing rings are adopted between the pilot valve sleeve (70) and the pilot valve body (6), between the plug (5) and the pilot valve body (6), between the main valve seat (3) and the main valve body (1), between the pilot valve body (6) and the main valve body (1), and between the pressure regulating screw (10) and the pilot valve body (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110099178.6A CN112747001B (en) | 2021-01-25 | 2021-01-25 | Pilot-operated overflow valve with position feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110099178.6A CN112747001B (en) | 2021-01-25 | 2021-01-25 | Pilot-operated overflow valve with position feedback |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112747001A true CN112747001A (en) | 2021-05-04 |
| CN112747001B CN112747001B (en) | 2024-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110099178.6A Active CN112747001B (en) | 2021-01-25 | 2021-01-25 | Pilot-operated overflow valve with position feedback |
Country Status (1)
| Country | Link |
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| CN (1) | CN112747001B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738923A (en) * | 2021-08-25 | 2021-12-03 | 浙江大学 | Pilot-operated high-pressure reducing valve with stable output flow and pressure and method thereof |
| CN117570076A (en) * | 2024-01-15 | 2024-02-20 | 无锡煤矿机械股份有限公司 | Overflow valve |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001323961A (en) * | 2000-05-15 | 2001-11-22 | Toyooki Kogyo Co Ltd | Hydraulic damper for vibration control |
| CN2786391Y (en) * | 2004-12-17 | 2006-06-07 | 上海华岛液压设备制造有限公司 | Pilot-operated overflow valve |
| CN106015140A (en) * | 2016-06-11 | 2016-10-12 | 宁波文泽机电技术开发有限公司 | Balance valve |
| US20170114857A1 (en) * | 2015-10-22 | 2017-04-27 | Mando Corporation | Damping force controlling shock absorber |
| CN107676237A (en) * | 2017-08-04 | 2018-02-09 | 崔迺林 | A kind of hydraulic piston pump reversal valve |
| CN207437914U (en) * | 2017-10-28 | 2018-06-01 | 济宁学院 | Pilot-operated type static-difference-free water pressure overflow valve |
| CN214404156U (en) * | 2021-01-25 | 2021-10-15 | 湖南人文科技学院 | Pilot-operated overflow valve with position feedback |
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2021
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001323961A (en) * | 2000-05-15 | 2001-11-22 | Toyooki Kogyo Co Ltd | Hydraulic damper for vibration control |
| CN2786391Y (en) * | 2004-12-17 | 2006-06-07 | 上海华岛液压设备制造有限公司 | Pilot-operated overflow valve |
| US20170114857A1 (en) * | 2015-10-22 | 2017-04-27 | Mando Corporation | Damping force controlling shock absorber |
| CN106015140A (en) * | 2016-06-11 | 2016-10-12 | 宁波文泽机电技术开发有限公司 | Balance valve |
| CN107676237A (en) * | 2017-08-04 | 2018-02-09 | 崔迺林 | A kind of hydraulic piston pump reversal valve |
| CN207437914U (en) * | 2017-10-28 | 2018-06-01 | 济宁学院 | Pilot-operated type static-difference-free water pressure overflow valve |
| CN214404156U (en) * | 2021-01-25 | 2021-10-15 | 湖南人文科技学院 | Pilot-operated overflow valve with position feedback |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738923A (en) * | 2021-08-25 | 2021-12-03 | 浙江大学 | Pilot-operated high-pressure reducing valve with stable output flow and pressure and method thereof |
| CN117570076A (en) * | 2024-01-15 | 2024-02-20 | 无锡煤矿机械股份有限公司 | Overflow valve |
| CN117570076B (en) * | 2024-01-15 | 2024-03-15 | 无锡煤矿机械股份有限公司 | Overflow valve |
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| Publication number | Publication date |
|---|---|
| CN112747001B (en) | 2024-08-27 |
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