CN203585443U - Direct-acting overflow valve - Google Patents
Direct-acting overflow valve Download PDFInfo
- Publication number
- CN203585443U CN203585443U CN201320599341.6U CN201320599341U CN203585443U CN 203585443 U CN203585443 U CN 203585443U CN 201320599341 U CN201320599341 U CN 201320599341U CN 203585443 U CN203585443 U CN 203585443U
- Authority
- CN
- China
- Prior art keywords
- valve
- change
- relief valve
- passage
- core
- 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.)
- Expired - Lifetime
Links
Images
Abstract
The utility model discloses a direct-acting overflow valve, and belongs to the technical field of overflow valves. The direct-acting overflow valve comprises a reversing valve and an overflow valve, wherein the valve body of the overflow valve is provided with an oil inlet channel and an oil outlet channel which are communicated with each other, the valve element of the overflow valve is arranged in the valve body of the overflow valve, one end of the valve element of the overflow valve is abutted against the elastic component of the overflow valve, and the other end is positioned between the oil inlet channel and the oil outlet channel for blocking or connecting the oil inlet channel and the oil outlet channel; the reversing valve comprises a valve body and a valve element; the outer wall of the valve element of the reversing valve is provided with a communicating groove; the valve body of the reversing valve is provided with a first channel and a second channel, one end of the first channel is communicated with the oil inlet channel, the other end of the first channel opens towards the valve element of the reversing valve, one end of the second channel is communicated with the oil outlet channel, and the other end opens towards the valve element of the reversing valve. An electromagnetic reversing valve is in parallel with the direct-acting overflow valve, damping holes and similar structures are avoided in the overflow valve, so that the structure is simpler, the requirement on machining accuracy is lower, and the reliability is higher.
Description
Technical field
The utility model relates to a kind of relief valve, particularly relates to a kind of direct-acting overflow valve.
Background technique
The widely used electromagnetic relief valve of existing hydraulic system is the form of solenoid directional control valve and precursor overflow valve combination.The frequent appearance of this pilot operated electromagnetic relief valve can not be built the situation of pressure, and its reason is generally following 3 points: 1. the damping hole in existing electromagnetic relief valve often can stop up because hydraulic oil is clean not, causes system can not go up pressure.Existing electromagnetic relief valve due to guide's fuel feeding seldom, when the needle-valve of precursor overflow valve has wearing and tearing, also can cause system can not go up pressure.3. in solenoid directional control valve has, let out and also can cause system can not go up pressure.
Summary of the invention
Based on this, the purpose of this utility model is to overcome the defect of prior art, and a kind of direct-acting overflow valve is provided, and has advantages of to build to press reliable, simple in structure, reliable performance, be easier to processing.
For achieving the above object, the utility model is taked following technological scheme:
A direct-acting overflow valve, comprises selector valve and relief valve;
Described relief valve comprises relief valve valve body, relief valve spool and relief valve elastic member; Described relief valve valve body has oil inlet passage and the oil discharge passage of connection, described relief valve spool is located in relief valve valve body, this relief valve spool one end presses on relief valve elastic member, the other end between oil inlet passage and oil discharge passage, shutoff or conducting oil inlet passage and oil discharge passage;
Described selector valve comprises change valve and change-over valve core; In described change valve, be provided with holding cavity, this change-over valve core external diameter coordinates with this holding cavity internal diameter, and change-over valve core can axially move along it in described holding cavity, and described change-over valve core outer wall is provided with connectivity slot; On described change valve, there is first passage and second channel, this first passage one end is communicated with oil inlet passage, the other end opening is towards change-over valve core, second channel one end is communicated with oil discharge passage, the other end opening is towards change-over valve core, described change-over valve core has first and moves position and second move position, and when change-over valve core is positioned at first while moving, described first passage and second channel are all opened on connectivity slot; When change-over valve core is positioned at second while moving, described first passage and second channel opening are intercepted by change-over valve core outer wall.
This direct-acting overflow valve working principle is as follows: when not needing to build pressure, described change valve is positioned at first and moves position, now first passage and second channel are all opened on connectivity slot, hydraulic oil enters from the oil inlet passage of relief valve, elastic force effect due to relief valve elastic member, relief valve spool one end is tightly inserted in oil inlet passage or oil discharge passage, by oil inlet passage or oil discharge passage sealing, hydraulic oil can only enter first passage by oil inlet passage, and by first passage, entered the connectivity slot being communicated with this first passage, in connectivity slot, enter second channel, the oil discharge passage of flowing through and being communicated with second channel, finally the oil discharge passage by relief valve valve body flows back to fuel tank, now, hydraulic system is in depressurization phase.
When needs are built pressure, described change valve is positioned at second and moves position, now first passage and second channel opening are intercepted by change-over valve core outer wall, hydraulic oil enters from the oil inlet passage of relief valve, elastic force effect due to relief valve elastic member, relief valve spool one end is tightly inserted in oil inlet passage or oil discharge passage, by oil inlet passage or oil discharge passage sealing, hydraulic oil can only enter first passage by oil inlet passage, and now the path between first passage and second channel is intercepted by change-over valve core outer wall, hydraulic oil cannot flow back to fuel tank through oil discharge passage, thereby make system build pressure.
When system pressure continues to rise, oil pressure acts on relief valve spool, reach while being enough to overcome the pressure of relief valve elastic member, the relief valve spool that this pressure makes to insert in oil inlet passage or oil discharge passage exits oil inlet passage or oil discharge passage, oil inlet passage and oil discharge passage are communicated with again, hydraulic oil is directly got back to fuel tank from the oil inlet passage oil discharge passage of flowing through, and realizes the function of pressure limiting.
In an embodiment, described connectivity slot is along circumferentially annular setting of change-over valve core therein.At change-over valve core, axially offer annular groove, can obtain by turner, there is simple, the reliable advantage of technique.
In an embodiment, described selector valve also comprises electromagnet therein, and this electromagnet comprises iron core and the electromagnetic coil of being located at iron core periphery, and described iron core connects change-over valve core, drives this change-over valve core axial motion.Utilize electromagnet to promote the motion of change-over valve core, be easy to accurately control.
In an embodiment, described selector valve also comprises the first retaining spring therein, and this first retaining spring one end is fixed, and the other end presses on described change-over valve core; Described the first retaining spring and iron core lay respectively at the axial two ends of described relief valve spool.Change-over valve core is pushed to by electromagnet behind one end of holding cavity, and electromagnet power-off pushes back initial position by this first retaining spring by change-over valve core.
Therein in an embodiment, described selector valve also comprises iron core drive link and the second retaining spring, and described iron core connects change-over valve core by this iron core drive link, and this second retaining spring is set in outside this iron core drive link, one end is fixed, and the other end presses on change-over valve core.By such design, make change-over valve core accurate positioning, build pressure, stress-relief process is accurately reliable.
In an embodiment, described relief valve spool shutoff oil inlet passage or oil discharge passage end are taper therein.The design of taper reaches while being enough to overcome the pressure of relief valve elastic member system pressure one, allow relief valve spool one retreat, can make immediately oil inlet passage and oil discharge passage again be communicated with, realize the function of pressure limiting, even and relief valve spool has a small amount of wearing and tearing, do not affect the effect of its shutoff drainback passage yet.
In an embodiment, described relief valve spool axially inserts in this oil inlet passage along oil inlet passage therein.By oil inlet passage, axially insert shutoff drainback passage and there is the stable feature of pressing of building.
Therein in an embodiment, described relief valve also comprises pressure regulating screw and the relief valve spring seat setting gradually along relief valve elastic member elastic force direction, described relief valve elastic member presses between relief valve spool and this relief valve spring seat, described relief valve valve body is provided with screw, and this pressure regulating screw inserts and contacts with relief valve spring seat from described screw.Can regulate pressure regulating screw to screw in the distance of screw, thereby by the position of regulation relief valve spring seat, carry out the decrement of regulation relief valve elastic member according to the size of pressure limiting pressure, reach the object that regulates pressure limiting pressure size.
In an embodiment, described pressure regulating screw is by nut fixed position therein.When pressure regulating screw rotation is extremely applicable to position, use nut fixed position, have advantages of simple and reliable.
The utility model also provides a kind of direct-acting overflow valve to build the method for pressure, by the change-over valve core in mobile selector valve, make the first passage of this change-over valve core outer wall in intercepting relief valve and the position of second channel, between the oil discharge passage that makes to be communicated with respectively the oil inlet passage of first passage and to be communicated with second channel, cannot be communicated with, allow cannot flow through oil inlet passage and oil discharge passage of hydraulic oil flow back to fuel tank, thereby make described direct-acting overflow valve build pressure.The utility model also provides a kind of method of direct-acting overflow valve release, by the position of the change-over valve core in mobile selector valve, make connectivity slot that this change-over valve core outer wall is provided be communicated with first passage in relief valve and the position of second channel, conducting between the oil discharge passage that makes to be communicated with respectively the oil inlet passage of first passage and to be communicated with second channel, allow flow through oil inlet passage and oil discharge passage of hydraulic oil finally flow back to fuel tank, thereby make described direct-acting overflow valve release.
Compared with prior art, the utlity model has following beneficial effect:
Direct-acting overflow valve of the present utility model, solenoid directional control valve is in parallel with direct-acting overflow valve, in its relief valve, avoided the such structure of damping hole, can avoid making hydraulic system can not build the problem of pressure because damping hole stops up, can avoid can not building because of the wearing and tearing of precursor overflow valve needle-valve the problem of pressure, can avoid letting out because solenoid directional control valve has in a small amount of the problem that can not build pressure, and this electromagnetism valve that overflows has simpler and structure, lower requirement on machining accuracy, higher reliability.
The direct-acting overflow valve that the utility model provides is built the method for pressure, release, connectivity slot is set on change-over valve core, set up new oil circuit, avoided the such structure of damping hole, thereby avoid making hydraulic system can not build the problem of pressure because damping hole stops up, can avoid can not building because of precursor overflow valve needle-valve wearing and tearing the problem of pressure, can avoid letting out because solenoid directional control valve has in a small amount of the problem that can not build pressure.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment 1 open type direct driving type electromagnetic relief valve principle schematic;
Structural representation when Fig. 2 is the utility model embodiment 1 open type direct driving type electromagnetic relief valve power-off;
Fig. 3 is open type direct driving type electromagnetic relief valve when energising structural representation of the utility model embodiment 1;
Fig. 4 is the utility model embodiment 2 normal close type direct driving type electromagnetic relief valve principle schematic;
Structural representation when Fig. 5 is the utility model embodiment 2 normal close type direct driving type electromagnetic relief valve power-off;
Fig. 6 is normal close type direct driving type electromagnetic relief valve when energising structural representation of the utility model embodiment 2.
Wherein: 1. relief valve; 11. relief valve valve bodies; 12. relief valve spools; 13. relief valve elastic members; 141. oil inlet passage; 142. oil discharge passage; 15. pressure regulating screws; 16. relief valve spring seats; 2. selector valve; 21. change valves; 22. change-over valve cores; 221. connectivity slot; 23. first retaining springs; 24. second retaining springs; 31. iron cores; 32 electromagnetic coils; 33. iron core drive links.
Embodiment
Below in conjunction with the drawings and specific embodiments, describe the utility model in detail.
Embodiment 1
Described relief valve comprises relief valve valve body 11, relief valve spool 12 and relief valve elastic member 13; Described relief valve valve body 11 has oil inlet passage 141 and the oil discharge passage 142 of connection, this oil inlet passage 141 and oil discharge passage 142 correspond respectively to filler opening A, oil outlet B, described relief valve spool 12 is located in relief valve valve body 11, one end presses on relief valve elastic member 13, the other end is between oil inlet passage 141 and oil discharge passage 142, insert in oil inlet passage 141, can shutoff or conducting oil inlet passage and oil discharge passage between oil circuit.
In a certain angle between this oil inlet passage 141 and oil discharge passage 142 are axial, be convenient to relief valve spool 12 and axially insert in this oil inlet passage 141 along oil inlet passage 141.Be understandable that, oil inlet passage 141 and oil discharge passage 142 also can be located along the same line, and relief valve spool 12 is axially to insert in oil inlet passage or oil discharge passage perpendicular to this oil inlet passage and oil discharge passage.
Described relief valve also comprises pressure regulating screw 15 and the relief valve spring seat 16 setting gradually along relief valve elastic member 13 elastic force directions, described relief valve elastic member 13 presses between relief valve spool 12 and this relief valve spring seat 16, described relief valve valve body 11 is provided with screw, and this pressure regulating screw 15 inserts and contacts with relief valve spring seat 16 from described screw.Can regulate pressure regulating screw 15 to screw in the distance of screw, thereby by the position of regulation relief valve spring seat 16, carry out the decrement of regulation relief valve elastic member 13 according to the size of pressure limiting pressure, reach the object that regulates pressure limiting pressure size.
Described pressure regulating screw 15 is by nut fixed position.When pressure regulating screw 15 rotations are extremely applicable to position, use nut fixed position.
Described selector valve comprises change valve 21 and change-over valve core 22; In described change valve 21, be provided with holding cavity, these change-over valve core 22 external diameters coordinate with this holding cavity internal diameter, and change-over valve core 22 can axially move along it in described holding cavity.Described selector valve also comprises electromagnet, and this electromagnet comprises iron core 31 and the electromagnetic coil 32 of being located at iron core 31 peripheries, and described iron core 31 connects change-over valve cores 22, drives this change-over valve core 22 axially in holding cavity, to move along it.
Described selector valve also comprises the first retaining spring 23, and these the first retaining spring 23 one end are fixed, and the other end presses on described change-over valve core 22; Described the first retaining spring 23 lays respectively at the axial two ends of described relief valve spool 12 with iron core 31.Change-over valve core 22 is pushed to by electromagnet behind one end of holding cavity, and electromagnet power-off pushes back initial position by this first retaining spring 23 by change-over valve core 22.
Described selector valve also comprises iron core drive link 33 and the second retaining spring 24, described iron core 31 connects change-over valve core 22 by this iron core drive link 33, this second retaining spring 24 is set in outside this iron core drive link 33, and one end is fixed, and the other end presses on change-over valve core 22.By such design, make change-over valve core 22 accurate positionings, build pressure, stress-relief process is accurately reliable.
Described change-over valve core 22 outer walls are circumferentially with annular connectivity slot 221, on described change valve 21, there is first passage and second channel, this first passage one end is communicated with oil inlet passage 141, the other end opening is towards change-over valve core 22, second channel one end is communicated with oil discharge passage 142, the other end opening is towards change-over valve core 22, described change-over valve core has first and moves position and second move position, when change-over valve core 22 is positioned at first while moving, described first passage and second channel are all opened on connectivity slot 221; When change-over valve core 22 is positioned at second while moving, described first passage and second channel opening are intercepted by change-over valve core outer wall.
The direct driving type electromagnetic relief valve workflow of the present embodiment is:
The open type direct driving type electromagnetic relief valve of take is example, its working principle as shown in Figure 1, when not needing to build pressure, described change valve 21 is positioned at first and moves position (being positioned at the left end of holding cavity), as shown in Figure 2, now first passage and second channel are all opened on connectivity slot 221, hydraulic oil enters from the filler opening A of relief valve, elastic force effect due to relief valve elastic member 13, make relief valve spool 12 one end tightly insert in oil inlet passage, oil inlet passage is sealed, hydraulic oil can only enter first passage b by oil inlet passage 141, and by first passage, entered the connectivity slot 221 being communicated with this first passage, in connectivity slot 221, enter second channel p, the oil discharge passage 142 of flowing through and being communicated with second channel, finally by the oil outlet B on relief valve valve body 11, flow back to fuel tank, now, hydraulic system is in depressurization phase.
When needs are built pressure, as shown in Figure 3, to electromagnet, switch on, electromagnetic coil 32 makes motion unshakable in one's determination, by iron core drive link 33 promotion change-over valve cores 22, move to second and move position (moving to the right-hand member of holding cavity), now first passage and second channel opening are intercepted by change-over valve core 22 outer walls, hydraulic oil enters from the filler opening A of relief valve, elastic force effect due to relief valve elastic member 13, make relief valve spool 12 one end tightly insert in oil inlet passage, drainback passage is sealed, hydraulic oil can only enter first passage b by oil inlet passage 141, and now the path between first passage and second channel is intercepted by change-over valve core 22 outer walls, hydraulic oil cannot flow back to fuel tank through oil discharge passage, thereby make system build pressure.
When system pressure continues to rise, oil pressure acts on relief valve spool 12, reach while being enough to overcome the pressure of relief valve elastic member 13, the relief valve spool 12 that this pressure makes to insert in oil inlet passage exits oil inlet passage, oil inlet passage 141 and oil discharge passage 142 are communicated with again, hydraulic oil is directly got back to fuel tank from oil inlet passage 141 oil discharge passage 142 of flowing through, and realizes the function of pressure limiting.And the relief valve spool 12 that inserts oil-feed tunnel ends is taper, the design of this taper reaches while being enough to overcome the pressure of relief valve elastic member 13 system pressure one, allow relief valve spool 12 1 retreat, can make immediately oil inlet passage 141 and oil discharge passage 142 again be communicated with, realize the function of pressure limiting, even and relief valve spool 12 has a small amount of wearing and tearing, do not affect the effect of its shutoff drainback passage yet.
In the present embodiment, electromagnet and the first retaining spring be arranged on respectively with embodiment 1 in not homonymy, thereby become normal close type direct driving type electromagnetic relief valve, its working principle as shown in Figure 4, described change valve is positioned at second and moves position (being positioned at the right-hand member of holding cavity), as shown in Figure 5, now first passage and second channel opening are intercepted by change-over valve core outer wall, hydraulic oil enters from the filler opening A of relief valve, elastic force effect due to relief valve elastic member, make relief valve spool one end tightly insert in oil inlet passage, oil inlet passage is sealed, hydraulic oil can only enter first passage b by oil inlet passage, and now the path between first passage and second channel is intercepted by change-over valve core outer wall, hydraulic oil cannot flow back to fuel tank through oil discharge passage, thereby make system build pressure.
When not needing to build pressure, to electromagnet, switch on, electromagnetic coil makes motion unshakable in one's determination, by iron core drive link promotion change-over valve core, move to first and move position (being positioned at the left end of holding cavity), as shown in Figure 6, now first passage and second channel are all opened on connectivity slot, hydraulic oil enters from the filler opening A of relief valve, elastic force effect due to relief valve elastic member, make relief valve spool one end tightly insert in oil inlet passage, oil inlet passage is sealed, hydraulic oil can only enter first passage b by oil inlet passage, and by first passage, entered the connectivity slot being communicated with this first passage, in connectivity slot, enter second channel p, the oil discharge passage of flowing through and being communicated with second channel, finally by the oil outlet B on relief valve valve body, flow back to fuel tank, now, hydraulic system is in depressurization phase.
The above embodiment has only expressed several mode of execution of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (8)
1. a direct-acting overflow valve, comprises selector valve and relief valve; It is characterized in that,
Described relief valve comprises relief valve valve body, relief valve spool and relief valve elastic member; Described relief valve valve body has oil inlet passage and the oil discharge passage of connection, described relief valve spool is located in relief valve valve body, this relief valve spool one end presses on relief valve elastic member, the other end between oil inlet passage and oil discharge passage, shutoff or conducting oil inlet passage and oil discharge passage;
Described selector valve comprises change valve and change-over valve core; In described change valve, be provided with holding cavity, this change-over valve core external diameter coordinates with this holding cavity internal diameter, and change-over valve core can axially move along it in described holding cavity, and described change-over valve core outer wall is provided with connectivity slot; On described change valve, there is first passage and second channel, this first passage one end is communicated with oil inlet passage, the other end opening is towards change-over valve core, second channel one end is communicated with oil discharge passage, the other end opening is towards change-over valve core, described change-over valve core has first and moves position and second move position, and when change-over valve core is positioned at first while moving, described first passage and second channel are all opened on connectivity slot; When change-over valve core is positioned at second while moving, described first passage and second channel opening are intercepted by change-over valve core outer wall.
2. direct-acting overflow valve according to claim 1, is characterized in that, described connectivity slot is along circumferentially annular setting of change-over valve core.
3. direct-acting overflow valve according to claim 1, is characterized in that, described selector valve also comprises electromagnet, and this electromagnet comprises iron core and is located at the electromagnetic coil of iron core periphery, described iron core connection change-over valve core.
4. direct-acting overflow valve according to claim 3, is characterized in that, described selector valve also comprises the first retaining spring, and this first retaining spring one end is fixed, and the other end presses on described change-over valve core; Described the first retaining spring and iron core lay respectively at the axial two ends of described relief valve spool.
5. direct-acting overflow valve according to claim 3, it is characterized in that, described selector valve also comprises iron core drive link and the second retaining spring, described iron core connects change-over valve core by this iron core drive link, this second retaining spring is set in outside this iron core drive link, one end is fixed, and the other end presses on change-over valve core.
6. direct-acting overflow valve according to claim 1, is characterized in that, described relief valve spool shutoff oil inlet passage or oil discharge passage end are taper.
7. direct-acting overflow valve according to claim 1, is characterized in that, described relief valve spool axially inserts in this oil inlet passage along oil inlet passage.
8. direct-acting overflow valve according to claim 1, it is characterized in that, described relief valve also comprises pressure regulating screw and the relief valve spring seat setting gradually along relief valve elastic member elastic force direction, described relief valve elastic member presses between relief valve spool and this relief valve spring seat, described relief valve valve body is provided with screw, and this pressure regulating screw inserts and contacts with relief valve spring seat from described screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320599341.6U CN203585443U (en) | 2013-09-26 | 2013-09-26 | Direct-acting overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320599341.6U CN203585443U (en) | 2013-09-26 | 2013-09-26 | Direct-acting overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203585443U true CN203585443U (en) | 2014-05-07 |
Family
ID=50583363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320599341.6U Expired - Lifetime CN203585443U (en) | 2013-09-26 | 2013-09-26 | Direct-acting overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203585443U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511678A (en) * | 2013-09-26 | 2014-01-15 | 番禺珠江钢管（珠海）有限公司 | Direct-acting overflow valve and method for establishing and releasing pressure thereof |
-
2013
- 2013-09-26 CN CN201320599341.6U patent/CN203585443U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103511678A (en) * | 2013-09-26 | 2014-01-15 | 番禺珠江钢管（珠海）有限公司 | Direct-acting overflow valve and method for establishing and releasing pressure thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103511678A (en) | Direct-acting overflow valve and method for establishing and releasing pressure thereof | |
| CN102865387B (en) | Electric proportional multi-way valve | |
| CN109826995A (en) | A kind of multi-sealed high-speed electromagnetic valve | |
| CN204327991U (en) | Piston electromagnetic valve | |
| CN105822618A (en) | Lifting valve plate of electric-hydraulic proportional multi-way valve of forklift | |
| CN203585443U (en) | Direct-acting overflow valve | |
| CN202673810U (en) | Direct-acting type three-way proportional throttling valve | |
| CN202769012U (en) | Guide type two-position two-way electromagnetic stop valve | |
| CN206329791U (en) | Pressure compensation electricity ratio seat valve | |
| CN203516093U (en) | Pressure and flow control valve of steering oil pump | |
| CN209414295U (en) | A kind of logical valve | |
| CN202629286U (en) | Change-over valve | |
| CN205349901U (en) | Back pressure valve | |
| CN104653536B (en) | A kind of load-sensitive valve | |
| CN202790680U (en) | Electronic controlled proportional multi-way valve | |
| CN104929930A (en) | Gear pump capable of achieving high-pressure flow and low-pressure flow convergence and distribution | |
| CN106641386B (en) | Pressure compensation electricity ratio seat valve | |
| CN101865172A (en) | Active piloted active servo proportional valve | |
| CN103527545A (en) | Combined hydraulic flow control valve | |
| CN109538556A (en) | For controlling the system and engineering machinery of Dual-pump flow-converging | |
| CN102966615A (en) | Servo hydraulic control system with automatically adjustable punching stroke and speed of punch press | |
| CN204704187U (en) | Overload unloading valve | |
| CN202900815U (en) | Servo hydraulic control system capable of adjusting punching stroke and punching speed of punch automatically | |
| CN204003724U (en) | A kind of three position four-way directional control valve | |
| CN203571178U (en) | Electromagnetic valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Precision pressure regulating type direct-acting overflow valve Effective date of registration: 20190920 Granted publication date: 20140507 Pledgee: Zhuhai Huafa Business and Trade Holding Co.,Ltd. Pledgor: PANYU CHU KONG STEEL PIPE (ZHUHAI) CO.,LTD. Registration number: Y2019980000179 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20200903 Granted publication date: 20140507 Pledgee: Zhuhai Huafa Business and Trade Holding Co.,Ltd. Pledgor: PANYU CHU KONG STEEL PIPE (ZHUHAI) Co.,Ltd. Registration number: Y2019980000179 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Overflow Effective date of registration: 20200911 Granted publication date: 20140507 Pledgee: Zhuhai Huafa Business and Trade Holding Co.,Ltd. Pledgor: PANYU CHU KONG STEEL PIPE (ZHUHAI) Co.,Ltd. Registration number: Y2020980005957 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20221031 Granted publication date: 20140507 Pledgee: Zhuhai Huafa Business and Trade Holding Co.,Ltd. Pledgor: PANYU CHU KONG STEEL PIPE (ZHUHAI) CO.,LTD. Registration number: Y2020980005957 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140507 |