CN112460092A - Flow valve and overflow valve integrated threaded cartridge valve - Google Patents
Flow valve and overflow valve integrated threaded cartridge valve Download PDFInfo
- Publication number
- CN112460092A CN112460092A CN202011454051.3A CN202011454051A CN112460092A CN 112460092 A CN112460092 A CN 112460092A CN 202011454051 A CN202011454051 A CN 202011454051A CN 112460092 A CN112460092 A CN 112460092A
- Authority
- CN
- China
- Prior art keywords
- valve
- groove
- valve core
- pilot
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000007789 sealing Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims 1
- 230000010354 integration Effects 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 13
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a flow valve and overflow valve integrated threaded cartridge valve, which comprises a valve sleeve, wherein a pilot valve core and a main valve core are arranged in the valve sleeve, the main valve core is arranged at the front end of the pilot valve core, a main spring is arranged in the main valve core, one end of the main spring is abutted against the main valve core, the other end of the main spring is abutted against the valve sleeve, a pilot spring is sleeved outside the pilot valve core, one end of the pilot spring is abutted against a bulge at the front end of the pilot valve core, the other end of the pilot spring is abutted against a locking structure at the rear end of the pilot valve core, a first through hole and a second through hole are formed in the valve sleeve, the first through hole corresponds to the position of the pilot valve core, the second through hole corresponds to the position of the main valve core, and a. The invention can adjust the system pressure, can realize unloading of the LS oil path when the multi-way valve stops working, realizes the integration of two threaded cartridge valves of an overflow valve and a flow valve, reduces the cost and saves the space.
Description
Technical Field
The invention relates to the technical field of hydraulic transmission, in particular to a threaded cartridge valve integrating a flow valve and an overflow valve.
Background
At present, a load-sensitive system is popular with more and more customers due to the characteristics of energy conservation and high efficiency, and for other load-sensitive multi-way valves, two threaded cartridge valves, namely an overflow valve for adjusting the pressure of the system and a flow valve for achieving LS oil way unloading when the multi-way valve stops working, are generally needed.
Disclosure of Invention
The invention aims to provide a threaded cartridge valve integrating a flow valve and an overflow valve, which can adjust the pressure of a system, can realize unloading of an LS oil way when a multi-way valve stops working, realizes integration of the overflow valve and the flow valve, reduces the cost and saves the space.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a flow valve and overflow valve integrated thread cartridge valve, which comprises a valve sleeve, wherein a pilot valve core and a main valve core are arranged in the valve sleeve, the main valve core is arranged at the front end of the pilot valve core, a main spring is arranged in the main valve core, one end of the main spring is abutted against the main valve core, the other end of the main spring is abutted against the valve sleeve, a pilot spring is sleeved outside the pilot valve core, one end of the pilot spring is abutted against a bulge at the front end of the pilot valve core, the other end of the pilot spring is abutted against a locking structure at the rear end of the pilot valve core, a first through hole and a second through hole are arranged on the valve sleeve, the first through hole corresponds to the position of the pilot valve core, the second through hole corresponds to the position of the main valve core, a third through hole is arranged on the side wall of the main valve core, and a fourth through hole is arranged at the front end of the main valve core, the front end of the main valve core is provided with a filter pad, and a fifth through hole is formed in the filter pad.
Preferably, the locking structure comprises an adjusting screw and a locking nut, one end of the adjusting screw is arranged in the valve sleeve, the adjusting screw is detachably connected with the locking nut through threads, and one end of the locking nut is in contact with the valve sleeve.
Preferably, one end of the adjusting screw extending into the valve sleeve is provided with a limit groove matched with the shape of the rear end of the pilot valve core.
Preferably, the valve sleeve comprises a first through groove, a second through groove and a third through groove which are sequentially communicated, the size of the second through groove is smaller than that of the first through groove and that of the third through groove, the main valve element is located in the first through groove, the length of the main valve element is smaller than that of the first through groove, the pilot valve element is located in the third through groove, the protrusion can penetrate through the second through groove and extend into the first through groove, and the inclined surface of the protrusion is matched with the inclined surface of the second through groove.
Preferably, when the main valve core is located at the front end of the first through groove, the second through hole is communicated with the third through hole.
Preferably, a first sealing ring is arranged between the valve sleeve and the locking structure.
Preferably, a clamping groove is formed in the outer side of the valve sleeve corresponding to the position of the pilot valve core, and a second sealing ring is arranged at the clamping groove.
Preferably, a groove is formed in the outer side of the valve sleeve located at the front end of the second through hole, and a check ring and a third sealing ring are arranged in the groove.
Compared with the prior art, the invention has the following technical effects:
when the multi-way valve starts to work, the LS oil path enters the valve sleeve through the fifth through hole to push the main valve core to move towards the rear end (the pilot valve core), the second through hole and the third through hole are staggered in position, one part of oil overflows through the second through hole, the other part of oil enters the main valve core through the fourth through hole, the bulge of the pilot valve core is separated from the valve sleeve, and the other part of oil overflows through the first through hole, so that the overflow is realized; when the multi-way valve stops working, the pilot valve core moves towards the main valve core under the pressure action of the pilot spring, so that the bulge of the pilot valve core is attached to the valve sleeve, the main valve core moves towards the front end, the second through hole corresponds to the third through hole in position, and hydraulic oil flows out through the fifth through hole, the fourth through hole, the third through hole and the second through hole, so that unloading is realized. The invention can adjust the system pressure, can realize unloading of the LS oil path when the multi-way valve stops working, realizes the integration of two threaded cartridge valves of an overflow valve and a flow valve, reduces the cost and saves the space.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic illustration of the unloading of a flow valve and overflow valve integrated threaded cartridge valve of the present invention;
FIG. 2 is a schematic overflow view of the flow valve and overflow valve integrated threaded cartridge valve of the present invention;
FIG. 3 is a hydraulic schematic of a multi-way valve and an integrated flow valve and overflow valve threaded cartridge valve of the present invention;
wherein: 1-adjusting screw, 2-locking nut, 3-first sealing ring, 4-valve sleeve, 5-pilot valve core, 6-second sealing ring, 7-pilot spring, 8-main spring, 9-main valve core, 10-retainer ring, 11-third sealing ring and 12-filter pad.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a threaded cartridge valve integrating a flow valve and an overflow valve, which can adjust the pressure of a system, can realize unloading of an LS oil way when a multi-way valve stops working, realizes integration of the overflow valve and the flow valve, reduces the cost and saves the space.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-3: the embodiment provides a flow valve and overflow valve integrated thread cartridge valve, which comprises a valve sleeve 4, a pilot valve core 5 and a main valve core 9 are arranged in the valve sleeve 4, the main valve core 9 is arranged at the front end of the pilot valve core 5, a main spring 8 is arranged in the main valve core 9, one end of the main spring 8 abuts against the main valve core 9, the other end of the main spring 8 abuts against the valve sleeve 4, a pilot spring 7 is sleeved outside the pilot valve core 5, one end of the pilot spring 7 abuts against a bulge at the front end of the pilot valve core 5, the other end of the pilot spring 7 abuts against a locking structure at the rear end of the pilot valve core 5, a first through hole and a second through hole are formed in the valve sleeve 4, the first through hole corresponds to the position of the pilot valve core 5, the second through hole corresponds to the position of the main valve core 9, a third through hole is formed in the side wall of the main valve core 9, a fourth through hole is formed in the front end of, the filter pad 12 is provided with a fifth through hole.
In this embodiment, the locking structure includes adjusting screw 1 and lock nut 2, and the one end setting of adjusting screw 1 is in valve barrel 4, and adjusting screw 1 passes through the screw thread with lock nut 2 and can dismantle the connection, and lock nut 2's one end and valve barrel 4 contact. One end of the adjusting screw 1 extending into the valve sleeve 4 is provided with a limit groove matched with the shape of the rear end of the pilot valve core 5. The pressure of the valve is changed by changing the length of the adjusting screw 1 extending into the valve sleeve 4.
In this embodiment, the valve housing 4 includes the first through groove, the second through groove and the third through groove that communicate in proper order, and the size that the second led to the groove is less than the size that the first led to the groove and the third led to the groove, and main spool 9 is located the first length that leads to the inslot and main spool 9's length is less than the length that the first led to the groove, and pilot spool 5 is located the third through groove, and the arch can pass the second and lead to the groove and stretch into the first through groove, and bellied inclined plane and the inclined plane phase-match that leads to the groove of second. When the main valve element 9 is positioned at the front end of the first through groove, the second through hole is communicated with the third through hole.
In this embodiment, a first sealing ring 3 is disposed between the valve sleeve 4 and the locking structure. A clamping groove is formed in the outer side of the valve sleeve 4 corresponding to the position of the pilot valve core 5, and a second sealing ring 6 is arranged at the clamping groove. A groove is arranged on the outer side of the valve sleeve 4 positioned at the front end of the second through hole, a check ring 10 and a third seal ring 11 are arranged in the groove, and the check ring 10 is a white check ring.
In the embodiment, the pre-tightening force of the pilot spring 7 is changed by adjusting the position of the locking structure, so that the pressure of the valve is adjusted, when the multi-way valve starts to work, the LS oil path enters the valve sleeve 4 through the fifth through hole, the main valve element 9 is pushed to move towards the rear end (the pilot valve element 5), the second through hole and the third through hole are staggered in position, one part of oil overflows through the second through hole, the other part of oil enters the main valve element 9 through the fourth through hole, the protrusion of the pilot valve element 5 is separated from the valve sleeve 4, and the other part of oil overflows through the first through hole, so that overflow is realized; when the multi-way valve stops working, the pilot valve core 5 moves towards the main valve core 9 under the pressure action of the pilot spring 7, so that the bulge of the pilot valve core 5 is attached to the valve sleeve 4, the main valve core 9 moves towards the front end, the second through hole corresponds to the third through hole in position, and hydraulic oil flows out through the fifth through hole, the fourth through hole, the third through hole and the second through hole, so that unloading is realized. The embodiment can adjust the system pressure, can realize unloading of the LS oil path when the multi-way valve stops working, realizes integration of the two threaded cartridge valves of the overflow valve and the flow valve, reduces the cost and saves the space.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides a flow valve and overflow valve integrated screw-thread cartridge valve which characterized in that: the valve comprises a valve sleeve, a pilot valve core and a main valve core are arranged in the valve sleeve, the main valve core is arranged at the front end of the pilot valve core, a main spring is arranged in the main valve core, one end of the main spring is abutted against the main valve core, the other end of the main spring is abutted against the valve sleeve, a pilot spring is sleeved outside the pilot valve core, one end of the pilot spring is abutted against a bulge at the front end of the pilot valve core, the other end of the pilot spring is abutted against a locking structure at the rear end of the pilot valve core, a first through hole and a second through hole are formed in the valve sleeve, the first through hole corresponds to the position of the pilot valve core, the second through hole corresponds to the position of the main valve core, a third through hole is formed in the side wall of the main valve core, a fourth through hole is formed in the front end of the main valve core, and a filter pad is arranged at the front end, and a fifth through hole is formed in the filtering pad.
2. The flow valve and overflow valve integrated threaded cartridge valve of claim 1, wherein: the locking structure comprises an adjusting screw and a locking nut, one end of the adjusting screw is arranged in the valve sleeve, the adjusting screw is detachably connected with the locking nut through threads, and one end of the locking nut is in contact with the valve sleeve.
3. The flow valve and overflow valve integrated threaded cartridge valve of claim 2, wherein: and one end of the adjusting screw extending into the valve sleeve is provided with a limit groove matched with the shape of the rear end of the pilot valve core.
4. The flow valve and overflow valve integrated threaded cartridge valve of claim 1, wherein: the valve sleeve comprises a first through groove, a second through groove and a third through groove which are sequentially communicated, the size of the second through groove is smaller than that of the first through groove and that of the third through groove, the main valve core is located in the first through groove, the length of the main valve core is smaller than that of the first through groove, the pilot valve core is located in the third through groove, the protrusion can penetrate through the second through groove and extend into the first through groove, and the inclined surface of the protrusion is matched with the inclined surface of the second through groove.
5. The flow valve and overflow valve integrated threaded cartridge valve of claim 4, wherein: when the main valve core is positioned at the front end of the first through groove, the second through hole is communicated with the third through hole.
6. The flow valve and overflow valve integrated threaded cartridge valve of claim 1, wherein: a first sealing ring is arranged between the valve sleeve and the locking structure.
7. The flow valve and overflow valve integrated threaded cartridge valve of claim 1, wherein: and a clamping groove is arranged on the outer side of the valve sleeve corresponding to the position of the pilot valve core, and a second sealing ring is arranged at the clamping groove.
8. The flow valve and overflow valve integrated threaded cartridge valve of claim 1, wherein: and a groove is formed in the outer side of the valve sleeve positioned at the front end of the second through hole, and a check ring and a third sealing ring are arranged in the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011454051.3A CN112460092B (en) | 2020-12-10 | 2020-12-10 | Threaded cartridge valve with integrated flow valve and overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011454051.3A CN112460092B (en) | 2020-12-10 | 2020-12-10 | Threaded cartridge valve with integrated flow valve and overflow valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112460092A true CN112460092A (en) | 2021-03-09 |
| CN112460092B CN112460092B (en) | 2024-08-02 |
Family
ID=74801858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011454051.3A Active CN112460092B (en) | 2020-12-10 | 2020-12-10 | Threaded cartridge valve with integrated flow valve and overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112460092B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215810A (en) * | 2021-12-21 | 2022-03-22 | 无锡市汉为液压气动有限公司 | Cartridge valve for flow distribution according to load pressure |
| CN114233905A (en) * | 2021-12-28 | 2022-03-25 | 哈尔滨工业大学 | High-precision electro-hydraulic proportional overflow valve with multiple steady-state hydraulic compensation mechanisms |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06185667A (en) * | 1992-12-18 | 1994-07-08 | Tokimec Inc | Pilot operated pressure control valve |
| JPH10213247A (en) * | 1997-01-30 | 1998-08-11 | Komatsu Ltd | Pilot valve type relief valve |
| JPH11132347A (en) * | 1997-10-31 | 1999-05-21 | Zexel:Kk | Two stage relief valve |
| US20110083763A1 (en) * | 2009-10-08 | 2011-04-14 | Volvo Construction Equipment Holding Sweden Ab. | Pressure control valve |
| DE102009053612A1 (en) * | 2009-11-17 | 2011-05-19 | Robert Bosch Gmbh | Pilot operated pressure control valve i.e. pressure-feeding valve, for use as working valve in e.g. traction drive, has valve device including throttle element, where element and/or bushing is formed with respect to cross sectional plane |
| KR101188227B1 (en) * | 2011-09-02 | 2012-10-08 | 이능수 | 3-port multi directional valve |
| CN202834247U (en) * | 2012-09-05 | 2013-03-27 | 北京工业大学 | Pure water hydraulic electromagnetism unloading overflow valve |
| CN202955297U (en) * | 2012-10-19 | 2013-05-29 | 宁波海伯天工液压有限公司 | Threaded pilot-operated overflow valve |
| CN203570729U (en) * | 2013-10-25 | 2014-04-30 | 宁波隆腾轴承液压件有限公司 | Piloted relief valve |
| CN108278393A (en) * | 2018-01-22 | 2018-07-13 | 宁波海宏液压有限公司 | A kind of slide valve type guide one-way overflow valve |
| CN209414290U (en) * | 2018-12-11 | 2019-09-20 | 烟台艾迪液压科技有限公司 | A kind of overflow valve with second level adjusting function |
| CN210715345U (en) * | 2019-08-15 | 2020-06-09 | 江苏菲尔特液压机械有限公司 | Threaded cartridge type one-way unloading overflow valve |
| CN213808271U (en) * | 2020-12-10 | 2021-07-27 | 山东泰丰智能控制股份有限公司 | Flow valve and overflow valve integrated threaded cartridge valve |
-
2020
- 2020-12-10 CN CN202011454051.3A patent/CN112460092B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06185667A (en) * | 1992-12-18 | 1994-07-08 | Tokimec Inc | Pilot operated pressure control valve |
| JPH10213247A (en) * | 1997-01-30 | 1998-08-11 | Komatsu Ltd | Pilot valve type relief valve |
| JPH11132347A (en) * | 1997-10-31 | 1999-05-21 | Zexel:Kk | Two stage relief valve |
| US20110083763A1 (en) * | 2009-10-08 | 2011-04-14 | Volvo Construction Equipment Holding Sweden Ab. | Pressure control valve |
| DE102009053612A1 (en) * | 2009-11-17 | 2011-05-19 | Robert Bosch Gmbh | Pilot operated pressure control valve i.e. pressure-feeding valve, for use as working valve in e.g. traction drive, has valve device including throttle element, where element and/or bushing is formed with respect to cross sectional plane |
| KR101188227B1 (en) * | 2011-09-02 | 2012-10-08 | 이능수 | 3-port multi directional valve |
| CN202834247U (en) * | 2012-09-05 | 2013-03-27 | 北京工业大学 | Pure water hydraulic electromagnetism unloading overflow valve |
| CN202955297U (en) * | 2012-10-19 | 2013-05-29 | 宁波海伯天工液压有限公司 | Threaded pilot-operated overflow valve |
| CN203570729U (en) * | 2013-10-25 | 2014-04-30 | 宁波隆腾轴承液压件有限公司 | Piloted relief valve |
| CN108278393A (en) * | 2018-01-22 | 2018-07-13 | 宁波海宏液压有限公司 | A kind of slide valve type guide one-way overflow valve |
| CN209414290U (en) * | 2018-12-11 | 2019-09-20 | 烟台艾迪液压科技有限公司 | A kind of overflow valve with second level adjusting function |
| CN210715345U (en) * | 2019-08-15 | 2020-06-09 | 江苏菲尔特液压机械有限公司 | Threaded cartridge type one-way unloading overflow valve |
| CN213808271U (en) * | 2020-12-10 | 2021-07-27 | 山东泰丰智能控制股份有限公司 | Flow valve and overflow valve integrated threaded cartridge valve |
Non-Patent Citations (1)
| Title |
|---|
| 刘国臣: "多路换向阀用插装溢流阀", 液压与气动, no. 01, 15 February 1994 (1994-02-15) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215810A (en) * | 2021-12-21 | 2022-03-22 | 无锡市汉为液压气动有限公司 | Cartridge valve for flow distribution according to load pressure |
| CN114233905A (en) * | 2021-12-28 | 2022-03-25 | 哈尔滨工业大学 | High-precision electro-hydraulic proportional overflow valve with multiple steady-state hydraulic compensation mechanisms |
| CN114233905B (en) * | 2021-12-28 | 2022-11-22 | 哈尔滨工业大学 | High-precision electro-hydraulic proportional overflow valve with multiple steady-state hydraulic compensation mechanisms |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112460092B (en) | 2024-08-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102878136B (en) | Screw-in cartridge valve | |
| CN103032612B (en) | Dual-opening-pressure dual-displacement safety valve | |
| CN112460092A (en) | Flow valve and overflow valve integrated threaded cartridge valve | |
| CN213808271U (en) | Flow valve and overflow valve integrated threaded cartridge valve | |
| CN202040134U (en) | Cartridge balanced valve | |
| CN1037951A (en) | Be used in particular for the one-way valve by hydraulic pressure opening of hydraulic bracket system | |
| CN108533763B (en) | Stop valve with controllable opening and closing speed | |
| CN108518376B (en) | Automatic reversing valve | |
| CN108061071B (en) | Plug-in type bidirectional buffer overflow valve | |
| CN203670326U (en) | Overflow valve of oily function is mended in area | |
| CN218670771U (en) | Opening pressure adjustable check valve | |
| CN201125893Y (en) | Bidirectional balanced valve | |
| CN112555214B (en) | Three-port two-way constant pressure difference valve | |
| CN102072216B (en) | Energy-saving reducing valve for hydraulic system | |
| CN201288863Y (en) | Superpose installation pilot-controlled check valve | |
| CN221373885U (en) | Booster pump integrated with external pressure regulating valve | |
| CN210423842U (en) | Two-way circulation filter | |
| CN105864435A (en) | Hydraulic control ultrahigh-pressure two-way stop valve for fluid and fluid stopping or communication method | |
| CN107246419A (en) | A kind of automatic control switch valve and its process | |
| CN216589356U (en) | Novel pilot overflow valve | |
| CN220706500U (en) | Plug-in type pressure reducing valve | |
| CN208057558U (en) | A kind of pilot operated compound relief valve | |
| CN101451559A (en) | Pressure test frock for electro-hydraulic servo valve pilot valve component | |
| CN219300008U (en) | Novel high-pressure safety overflow valve | |
| CN214404162U (en) | Damping screw with built-in one-way valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |