CN110878779B - Pressure reducing valve - Google Patents
Pressure reducing valve Download PDFInfo
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- CN110878779B CN110878779B CN201911194237.7A CN201911194237A CN110878779B CN 110878779 B CN110878779 B CN 110878779B CN 201911194237 A CN201911194237 A CN 201911194237A CN 110878779 B CN110878779 B CN 110878779B
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- valve core
- port
- valve
- pressure
- valve body
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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
- F15B13/025—Pressure reducing valves
Abstract
The invention belongs to the technical field of valve equipment. The invention discloses a pressure reducing valve which comprises a valve body, a first valve core, a second valve core, a control valve core and a pre-tightening unit, wherein the valve body is provided with a first valve core and a second valve core; the valve body is provided with a P port, an A port and a T port, the first valve core, the second valve core and the control valve core are positioned in the valve body and can move relatively, the control valve core penetrates through the first valve core and the second valve core, and the control valve core can respectively drive the first valve core or the second valve core to move in the process of moving under the action of oil pressure of the A port and pretightening force of the pretightening unit, so that the first valve core controls the connection and disconnection of the A port and the P port, and the second valve core controls the connection and disconnection of the A port and the T port. The pressure reducing valve disclosed by the invention is small in size and compact in structure, and can realize convenient and accurate adjustment and accurate control of pressure aiming at the working conditions of high flow and high pressure.
Description
Technical Field
The invention belongs to the technical field of valve equipment, and particularly relates to a pressure reducing valve.
Background
The pressure reducing valve is one of the essential elements of the fluid circuit, and the existing two-way pressure reducing valves and three-way pressure reducing valves are basically in the form of slide valves. However, when the pressure-maintaining or load-increasing operation is required to be performed on the pressure-reducing branch, leakage from the pressure-reducing port to the pressure-releasing port or the inlet may occur due to the increase of the pressure of the working port, so that the working circuit cannot achieve the pressure-maintaining effect. At this time, the pressure holding must be realized by an accumulator or a solenoid valve with two-way cutoff, which results in a complex structure of the whole system and increased cost.
In addition, when the existing pressure reducing valve is used under the condition of high pressure and large flow, the flow is generally required to be increased by increasing the diameter size of the pressure reducing valve core. However, in the conventional pressure reducing valve, the pressure of the pressure reducing port is directly applied to the pressure reducing valve core, and then compared with the pressure reducing spring, if the diameter of the pressure reducing valve core is increased and the pressure reducing valve core works under a high-pressure working condition, the required pressure reducing spring specification is large, so that the overall volume of the pressure reducing valve is large, the cost is high, and the pressure regulation difficulty and the pressure control precision are reduced due to the increase of the spring stiffness.
Disclosure of Invention
In order to solve the problems of the conventional pressure reducing valve in the working process, the invention provides a pressure reducing valve with a brand new structure. The pressure reducing valve comprises a valve body, a first valve core, a second valve core, a control valve core, a pre-tightening unit and a resetting piece; the valve body is provided with a port P, a port A and a port T, and the port A is positioned between the port P and the port T along the axial direction;
the first valve core is positioned in the valve body, can axially move back and forth relative to the valve body, controls the connection and disconnection of the port A and the port P, and is provided with a first connecting hole which axially penetrates through the first valve core; the upper end of the first valve core and the valve body form a first oil cavity, the first oil cavity is communicated with the port A, and the lower end of the first valve core is communicated with the port A;
the second valve core is positioned in the valve body, can axially move back and forth relative to the valve body and controls the connection and disconnection of the port A and the port T, and a second connecting hole which penetrates through the second valve core along the axial direction is formed in the second valve core; the lower end of the second valve core and the valve body form a second oil cavity, the second oil cavity is communicated with the port A, and the upper end of the second valve core is communicated with the port A;
the control valve core is positioned in the valve body, sequentially passes through the first connecting hole of the first valve core and the second connecting hole of the second valve core along the axial direction, and can respectively move axially relative to the first valve core and the second valve core; the upper end of the control valve core is in contact with the pre-tightening unit, the pre-tightening unit forms downward pre-pressure on the control valve core, the lower end of the control valve core is located in the second oil cavity, and oil pressure at the opening A forms upward hydraulic pressure on the control valve core; the control valve core is provided with an upper limit and a lower limit, the upper limit is positioned above the first valve core and can drive the first valve core to move downwards, and the lower limit is positioned below the second valve core and can drive the second valve core to move upwards;
the reset piece is sleeved on the control valve core, keeps a pre-compression state, and is in contact with the lower end of the first valve core at one end and is in contact with the upper end of the second valve core at the other end.
Preferably, a through hole is formed in the control valve core, and the first oil chamber, the second oil chamber and the port A are communicated through the through hole.
Preferably, the lower end of the first valve core adopts a conical surface structure and is used for performing line sealing on the port A and the port P.
Further preferably, the upper end of the first valve core is of a cylindrical structure.
Preferably, the upper end of the second valve core adopts a conical surface structure and is used for performing line sealing on the port A and the port T.
Further preferably, the lower end of the second valve core is of a cylindrical structure.
Preferably, the pre-tightening unit adopts a combination form of a pressure regulating spring and a regulating screw rod; the adjusting screw rod is in threaded connection with the valve body, and one end of the adjusting screw rod extends into the valve body and is in contact with the pressure adjusting spring.
Preferably, the return member is in the form of a spring.
Preferably, the upper limit and the lower limit both adopt check rings.
Preferably, the valve body adopts a split structure and comprises an upper valve body used for installing the first valve core and a lower valve body used for installing the second valve core, and the upper valve body is connected with the lower valve body through threads.
Compared with the existing pressure reducing valve, when the pressure reducing valve disclosed by the invention is used for oil pressure control, the pressure reducing valve has the following beneficial technical effects:
1. in the invention, the first valve core, the second valve core and the control valve core are arranged in the valve body, and the control valve core with the smallest diameter and size is directly controlled by the pre-pressure and the oil pressure of the port A to move, so that the first valve core and the second valve core are driven by the control valve core to move, and the on-off relation between the port A and the ports P and T is further controlled by the first valve core and the second valve core. At the moment, the first valve core and the second valve core only need to control the connection and disconnection among the port A, the port P and the port T under the driving of the control valve core, and the first valve core and the second valve core do not directly bear the pretightening force and the oil pressure force at the port A, but bear the changes of the pretightening force and the oil pressure force at the position A by the control valve core with the smallest diameter size. Therefore, the valve core for controlling the flow and the valve core for bearing the acting force change are separately and independently designed, so that the small-size structural design of the control valve core can be kept under the working conditions of high flow and high pressure, the structural size of the pre-tightening unit can be greatly reduced, the volume size of the whole pressure reducing valve is reduced, and the structural compactness of the pressure reducing valve is improved. Meanwhile, for the pre-tightening unit adopting the spring structure form, the rigidity of the spring can be greatly reduced, so that the convenience and the accuracy of pre-tightening force adjustment are improved, and the control accuracy of the whole pressure reducing valve is further ensured.
2. In the invention, the upward acting force and the downward acting force generated by the P port oil pressure on the first valve core are equal, and the upward acting force and the downward acting force generated by the T port oil pressure on the second valve core are equal, so that the action influence of the P port pressure and the T port pressure on the first valve core and the second valve core is completely eliminated, the action of the first valve core and the second valve core is completely controlled by the A port oil pressure and the acting force of the pre-tightening unit, the fluctuation influence of the P port oil pressure on the A port oil pressure is avoided, and the pressure regulation control precision of the whole pressure reducing valve is greatly improved.
3. In the invention, the lower end of the first valve core and the upper end of the second valve core are designed into conical surface structures, so that the linear sealing among the port A, the port P and the port T is formed. Therefore, the sealing performance among the port A, the port P and the port T can be greatly improved, the leakage is reduced, and the working reliability of the whole pressure reducing valve is improved.
Drawings
FIG. 1 is a schematic structural view of the pressure reducing valve of the present embodiment in the closed position of port A;
FIG. 2 is a schematic structural view of the pressure reducing valve of the present embodiment at a position where the port A communicates with the port P;
fig. 3 is a schematic structural view of the pressure reducing valve of the present embodiment at a position where the port a communicates with the port T.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
Referring to fig. 1, the pressure reducing valve of the present embodiment includes a valve body 1, a first valve element 2, a second valve element 3, a control valve element 4, a preload unit 5, and a reset element 6. The valve body 1 is in a plug-in valve body structure form, is provided with a port P, a port A and a port T, and is positioned between the port P and the port T along the axis direction.
The first valve core 2 is located inside the valve body 1, can move back and forth in the axial direction relative to the valve body 1, so as to control the on-off of the port A and the port P, and is provided with a first connecting hole penetrating in the axial direction on the first valve core 2. The upper end of the first valve core 2 and the valve body 1 form a first oil chamber 11, and the first oil chamber 11 is communicated with the port A, so that the oil pressure at the port A forms a downward hydraulic pressure on the upper end of the first valve core 2; the lower end of the first valve core 2 is communicated with the port A, so that the oil pressure at the port A forms an upward hydraulic pressure to the lower end of the first valve core 2 at the same time.
The second spool 3 is located inside the valve body 1 and is axially movable back and forth with respect to the valve body 1 to control the opening and closing of the port a and the port T, and the second spool 3 is provided with a second connection hole penetrating in the axial direction. Wherein, the lower end of the second valve core 3 and the valve body 1 form a second oil chamber 12, and the second oil chamber 12 is communicated with the port A, so that the oil pressure at the port A forms an upward hydraulic pressure for the lower end of the second valve core 3; the lower end of the second spool 3 communicates with port a so that the oil pressure at port a simultaneously creates a downward hydraulic force on the upper end of the second spool 3.
The control valve core 4 is located inside the valve body 1, sequentially passes through the first connection hole of the first valve core 2 and the second connection hole of the second valve core 3 in the axial direction, and can axially move relative to the first valve core 2 and the second valve core 3, respectively. The upper end of the control valve core 4 is in contact connection with the pre-tightening unit 5, and bears the downward pre-pressure generated by the pre-tightening unit 5, and the lower end of the control valve core 4 is located in the second oil cavity 12 and bears the upward hydraulic pressure generated by the oil hydraulic pressure at the opening A. Meanwhile, the control valve core 4 is further provided with an upper limit 41 and a lower limit 42, wherein the upper limit 41 is located above the first valve core 2 and can drive the first valve core 2 to move downwards, and the lower limit 42 is located below the second valve core 3 and can drive the second valve core 3 to move upwards.
In the present embodiment, the upper limit 41 and the lower limit 42 adopt a retainer ring structure, and an annular groove is formed on the outer surface of the control valve core 4 for installing the retainer ring. Like this, not only can realize the drive effect to first case and second case, can realize the quick assembly disassembly of first case and second case and control valve core moreover, improve the convenience of operation. In other embodiments, other configurations are also possible, such as a detent pin inserted in the radial direction of the control valve element.
The pre-tightening unit 5 is located at the top of the valve body 1, is fixedly connected with the valve body 1, and is used for forming downward pre-pressure on the control valve core 4. In the present embodiment, the pretensioning unit 5 is a combination of a pressure regulating spring 51 and an adjusting screw 52, and the adjusting screw 52 is in threaded connection with the valve body 1 through an adjusting sleeve 53, and has one end extending to the inside of the valve body 1 to contact the pressure regulating spring 51. Thus, the pre-tightening acting force of the pressure spring can be adjusted by adjusting the rotation of the adjusting screw, so that the action of the control valve core is adjusted and controlled. Similarly, in other embodiments, the pre-tightening unit may also adopt other structural forms and control modes, for example, pressure control of external control oil is adopted, so as to realize downward pre-pressure on the control valve core.
The reset piece 6 is sleeved on the control valve core 4, and in a pre-compression state, one end of the reset piece is in contact with the lower end of the first valve core 2, and the other end of the reset piece is in contact with the upper end of the second valve core 3, so that an upward reset acting force is formed on the first valve core 2, and a downward reset acting force is formed on the second valve core 3. In the present embodiment, the restoring member is in the form of a pre-compressed coil spring, and in other embodiments, other structures, such as a disc spring, may be used to form the upward restoring force to the first valve core and the downward restoring force to the second valve core.
Preferably, as shown in fig. 1, a through hole 43 is provided inside the control valve core 4 of the present embodiment, and the through hole 43 communicates the first oil chamber 11 and the second oil chamber 12 with the port a, so as to guide the oil pressure at the port a to the first oil chamber 11 and the second oil chamber 12, respectively. Therefore, by using the oil way inside the control valve core, the additional oil way arrangement on the valve body can be omitted, so that the processing complexity of the valve body is greatly reduced, the processing cost is reduced, and the structural compactness of the whole pressure reducing valve is improved. Similarly, in other embodiments, the three can be communicated by an additional oil passage according to design and processing requirements.
Referring to fig. 1, in the present embodiment, the lower end of the first valve element 2 is in a conical surface structure, so that the seal between the port a and the port P is in a linear seal form, thereby improving the sealing effect between the port a and the port P. Meanwhile, when the lower end of the first valve core adopts a conical surface structure, the area of the lower end of the first valve core can be slightly larger than that of the upper end of the first valve core, and therefore the oil hydraulic pressure at the position of the port A can form an upward hydraulic pressure on the first valve core, so that the auxiliary reset piece controls the first valve core to seal the port A and the port P, and the sealing effect of the first valve core between the port A and the port P is improved. Similarly, in other embodiments, the lower end of the first valve core may also adopt a cylindrical structure to form a slide valve to control the connection and disconnection between the port a and the port P according to design and processing requirements.
Similarly, as shown in fig. 1, in this embodiment, the upper end of the second valve element 3 also adopts a conical surface structure, so that a linear seal is formed between the port a and the port T, and the sealing effect of the second valve element on the port a and the port T is improved.
Meanwhile, as shown in fig. 1, the upper end of the first valve spool 2 has a cylindrical structure, so that the contact sliding area of the first valve spool 2 with the valve body 1 and the control valve spool 4 can be increased. Therefore, the sealing effect of the first oil cavity can be improved, the guiding and supporting effect can be achieved in the reciprocating movement process of the first valve core, the valve body and the control valve core are prevented from being clamped, and the control action of the whole pressure reducing valve is guaranteed to be stably and smoothly carried out.
Similarly, referring to fig. 1, in the present embodiment, the lower end of the second valve core 3 is also of a cylindrical structure, so as to improve the sealing effect of the second valve core on the second oil chamber and ensure the smooth stability of the reciprocating movement of the second valve core.
In addition, as shown in fig. 1, in the present embodiment, the valve body 1 is in a split structure, and includes an upper valve body 1a for mounting the first valve element 2 and a lower valve body 1b for mounting the second valve element 3, and the upper valve body 1a and the lower valve body 1b are connected by a screw. Therefore, the valve body is convenient to process and manufacture, the whole pressure reducing valve is convenient to disassemble and assemble, the processing and manufacturing convenience is improved, and the processing cost is reduced.
Referring to fig. 1 to 3, when the pressure reducing valve of the present embodiment is used, the port P is connected to the oil inlet, the port a is connected to the pressure reducing branch, and the port T is connected to the oil return port, the specific pressure adjusting process is as follows:
when the oil pressure at the port A is lower than the set pressure of the pre-tightening unit 5, the downward pre-pressure borne by the upper end of the control valve core 4 is greater than the upward hydraulic pressure borne by the lower end of the control valve core, so that the control valve core starts to move downward relative to the valve body 1 and the first valve core 2, wherein the upward acting force and the downward acting force generated by the oil pressure at the port P on the first valve core 2 are equal, and the first valve core 2 is kept static; when the control valve core 4 moves to the upper limit 41 and contacts with the upper end face of the first valve core 2, the control valve core 4 starts to drive the first valve core 2 to move downwards relative to the valve body 1 through the upper limit 41, overcomes the upward reset acting force of the reset piece 6 on the first valve core 2, gradually loses the sealing effect on the port A and the port P at the lower end of the first valve core 2, communicates the port A with the port P, and further enables the oil pressure at the port A to start to rise as shown in the position of fig. 2.
When the oil pressure at the opening A gradually rises to be equal to the set pressure of the pre-tightening unit 5, the lower end hydraulic pressure of the control valve core 4 overcomes the pre-tightening pressure of the pre-tightening unit 5 and starts to move upwards, so that the upper limit 41 is separated from the upper end of the first valve core 2; at the same time, the first valve core 2 starts to move upwards under the upward reset force of the reset piece 6 until the lower end of the first valve core 2 forms a seal with the port a and the port P again, as shown in the position of fig. 1.
When the oil hydraulic pressure at the port A is higher than the set pressure of the pre-tightening unit 5, the upward hydraulic pressure borne by the lower end of the control valve core 4 is greater than the downward pre-pressure borne by the upper end of the control valve core, so that the control valve core starts to move upwards relative to the valve body 1 and the second valve core 3, wherein the upward acting force and the downward acting force generated by the oil hydraulic pressure at the port T on the second valve core 3 are equal, and the second valve core 3 is kept static; when the control valve core 4 moves to the lower limit 42 and contacts with the lower end face of the second valve core 3, the control valve core 4 starts to drive the second valve core 3 to move upwards together relative to the valve body 1 through the lower limit 42, overcomes the downward resetting acting force of the resetting piece 6 on the second valve core 3, enables the upper end of the second valve core 3 to lose the sealing effect on the port A and the port T, communicates the port A with the port T, and further enables the oil pressure at the port A to start to fall at the position shown in fig. 3.
When the oil pressure at the port A is gradually reduced to be equal to the set pressure of the pre-tightening unit 5, the pre-pressure at the upper end of the control valve core 4 overcomes the hydraulic pressure at the lower end of the control valve core and starts to move downwards, so that the lower limit 42 is separated from the lower end of the second valve core 3; at the same time, the second spool 3 starts to move downwards under the downward return force of the return element 6 until the upper end of the second spool 3 again forms a seal with the ports a and T, as shown in the position of fig. 1.
Claims (9)
1. A pressure reducing valve is characterized by comprising a valve body, a first valve core, a second valve core, a control valve core, a pre-tightening unit and a resetting piece; the valve body is provided with a port P, a port A and a port T, and the port A is positioned between the port P and the port T along the axial direction;
the first valve core is positioned in the valve body, can axially move back and forth relative to the valve body, controls the connection and disconnection of the port A and the port P, and is provided with a first connecting hole which axially penetrates through the first valve core; the upper end of the first valve core and the valve body form a first oil cavity, the first oil cavity is communicated with the port A, and the lower end of the first valve core is communicated with the port A;
the second valve core is positioned in the valve body, can axially move back and forth relative to the valve body and controls the connection and disconnection of the port A and the port T, and a second connecting hole which penetrates through the second valve core along the axial direction is formed in the second valve core; the lower end of the second valve core and the valve body form a second oil cavity, the second oil cavity is communicated with the port A, and the upper end of the second valve core is communicated with the port A; the pre-tightening unit adopts a combination form of a pressure regulating spring and a regulating screw rod; the adjusting screw rod is in threaded connection with the valve body through an adjusting sleeve, and one end of the adjusting screw rod extends into the valve body and is in contact with the pressure adjusting spring;
the control valve core is positioned in the valve body, sequentially passes through the first connecting hole of the first valve core and the second connecting hole of the second valve core along the axial direction, and can respectively move axially relative to the first valve core and the second valve core; the upper end of the control valve core penetrates through the first oil cavity and is in contact with the pre-tightening unit, the pre-tightening unit forms downward pre-pressure on the control valve core, the lower end of the control valve core is located in the second oil cavity, and oil pressure at the opening A forms upward hydraulic pressure on the control valve core; the control valve core is provided with an upper limit and a lower limit, the upper limit is positioned above the first valve core and can drive the first valve core to move downwards, and the lower limit is positioned below the second valve core and can drive the second valve core to move upwards;
the reset piece is sleeved on the control valve core, keeps a pre-compression state, and is in contact with the lower end of the first valve core at one end and is in contact with the upper end of the second valve core at the other end.
2. The pressure reducing valve according to claim 1, wherein a through hole is provided in an interior of the control spool, the through hole communicating the first oil chamber, the second oil chamber, and the port a.
3. The pressure reducing valve according to claim 1, wherein the lower end of the first valve element is of a conical surface structure for performing line sealing on the port a and the port P.
4. The pressure relief valve of claim 3, wherein the upper end of the first spool is of cylindrical configuration.
5. The pressure reducing valve according to claim 1, wherein the upper end of the second valve element is of a conical surface structure for line sealing of the port a and the port T.
6. The pressure relief valve of claim 5, wherein the lower end of the second spool is of cylindrical configuration.
7. The pressure relief valve of any one of claims 1-6, wherein said return member is in the form of a spring.
8. The pressure reducing valve according to any one of claims 1 to 6, wherein both the upper limit and the lower limit employ a check ring.
9. The pressure reducing valve according to any one of claims 1 to 6, wherein the valve body is of a split structure and comprises an upper valve body for mounting the first valve spool and a lower valve body for mounting the second valve spool, and the upper valve body is in threaded connection with the lower valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911194237.7A CN110878779B (en) | 2019-11-28 | 2019-11-28 | Pressure reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911194237.7A CN110878779B (en) | 2019-11-28 | 2019-11-28 | Pressure reducing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110878779A CN110878779A (en) | 2020-03-13 |
| CN110878779B true CN110878779B (en) | 2021-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911194237.7A Active CN110878779B (en) | 2019-11-28 | 2019-11-28 | Pressure reducing valve |
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| CN (1) | CN110878779B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4160463A (en) * | 1977-10-13 | 1979-07-10 | Baker Cac, Inc. | Flow line monitor pilot valve assembly |
| US6886597B2 (en) * | 2000-12-01 | 2005-05-03 | Eaton Corporation | Proportional electrovalve for motor cooling liquid circuit |
| CN103363165A (en) * | 2012-03-27 | 2013-10-23 | 株式会社不二工机 | Reducing valve |
| CN107906231A (en) * | 2017-12-21 | 2018-04-13 | 宁波文泽机电技术开发有限公司 | A kind of plug-in one-way speed-regulating valve |
| CN108561358A (en) * | 2018-01-22 | 2018-09-21 | 邵立坤 | A kind of differential circuit switching valve and hydraulic differential circuit |
| CN108700221A (en) * | 2016-02-11 | 2018-10-23 | 贺尔碧格自动化技术控股股份有限公司 | Proportioning valve |
| CN108953633A (en) * | 2018-09-27 | 2018-12-07 | 邵延荣 | A kind of screw-in cartridge valve |
| CN110500424A (en) * | 2018-05-17 | 2019-11-26 | 株式会社不二工机 | Three-way switch valve |
-
2019
- 2019-11-28 CN CN201911194237.7A patent/CN110878779B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4160463A (en) * | 1977-10-13 | 1979-07-10 | Baker Cac, Inc. | Flow line monitor pilot valve assembly |
| US6886597B2 (en) * | 2000-12-01 | 2005-05-03 | Eaton Corporation | Proportional electrovalve for motor cooling liquid circuit |
| CN103363165A (en) * | 2012-03-27 | 2013-10-23 | 株式会社不二工机 | Reducing valve |
| CN108700221A (en) * | 2016-02-11 | 2018-10-23 | 贺尔碧格自动化技术控股股份有限公司 | Proportioning valve |
| CN107906231A (en) * | 2017-12-21 | 2018-04-13 | 宁波文泽机电技术开发有限公司 | A kind of plug-in one-way speed-regulating valve |
| CN108561358A (en) * | 2018-01-22 | 2018-09-21 | 邵立坤 | A kind of differential circuit switching valve and hydraulic differential circuit |
| CN110500424A (en) * | 2018-05-17 | 2019-11-26 | 株式会社不二工机 | Three-way switch valve |
| CN108953633A (en) * | 2018-09-27 | 2018-12-07 | 邵延荣 | A kind of screw-in cartridge valve |
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|---|---|
| CN110878779A (en) | 2020-03-13 |
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Effective date of registration: 20210701 Address after: Donggang Village, Longxi Town, Yuhuan City, Taizhou City, Zhejiang Province 317600 Applicant after: ZHEJIANG WANDEKAI FLUID EQUIPMENT TECHNOLOGY Co.,Ltd. Address before: No. 201, building 2, zone 1, No. 2, headquarters 2nd Road, Songshanhu high tech Industrial Development Zone, Dongguan City, Guangdong Province, 523000 (cluster registration) Applicant before: DONGGUAN HAITE PAWO HYDRAULIC TECHNOLOGY Co.,Ltd. |
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