CN102777663B - Electro-mechanical dual control pilot valve for unloading valve - Google Patents
Electro-mechanical dual control pilot valve for unloading valve Download PDFInfo
- Publication number
- CN102777663B CN102777663B CN201210245380.6A CN201210245380A CN102777663B CN 102777663 B CN102777663 B CN 102777663B CN 201210245380 A CN201210245380 A CN 201210245380A CN 102777663 B CN102777663 B CN 102777663B
- Authority
- CN
- China
- Prior art keywords
- valve
- valve body
- auxiliary
- unloading
- control pilot
- 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.)
- Active
Links
Landscapes
- Details Of Valves (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention discloses an electro-mechanical dual control pilot valve for an unloading valve. The problems of complicated structure, large manufacture difficulty and maintaining inconvenience in the prior art are overcome. The electro-mechanical dual control pilot valve for the unloading valve is characterized in that a valve body communication hole and a secondary valve body communication hole are interconnected to form a high-pressure fluid channel for supplying liquid by a solenoid pilot valve, or a valve body counter bore is added to form the high-pressure fluid channel for supplying liquid by the solenoid pilot valve together with a secondary valve body counter bore and a one-way valve assembly; the valve body communication hole and the secondary valve body communication hole are correspondingly communicated to form a liquid inlet channel and a liquid return channel; two secondary valve body main holes are processed on the secondary valve body; a cartridge valve core is inserted into a first main hole of the secondary valve body; a filter core or the filter core containing a rapid joint seat externally connected with an accumulator is arranged inside a second main hole of the secondary valve body; and the secondary valve is arranged on the back side of a mechanical pilot valve, and the solenoid pilot valve is arranged on the secondary valve. The electro-mechanical dual control pilot valve has the beneficial effects that high-pressure liquid does not need to be externally connected; the filter and the one-way valve do not need to be externally connected, and the electro-mechanical dual control pilot valve has the filter function and one-way valve function, is simple in structure, reduces the manufacture difficulty and brings about convenience for maintenance.
Description
Technical field
The invention belongs to pumping plant control apparatus technical field, particularly a kind of electromechanical double-control pilot valve for unloading valve of colliery emulsion pump.
Background technique
The pilot valve of prior art emulsion power pack hydraulic control unloader valve, carry out liquid orifice plug and control piston orifice plug forms by valve body, valve seat, spool, step-up piston, strong spring and impulse orifice plug, pump, the pilot valve of this hydraulic control structure, can only realize hydraulic unloading, and pressure surge value is larger, meanwhile, the pilot valve of this structure can not be realized No Load Start and unloaded termination of pumping, and adjusting pressure also needs manpower control.In prior art, also have a kind of mechanism that hydraulic unloading and automatically controlled off-load are installed on a covering device simultaneously, but it can only realize automatically controlled off-load or hydraulic unloading by switching, when in automatically controlled off-load, malfunctioning or automatical control system is not charged, hydraulic unloading can not automatic operation.
In order to solve the problems of the technologies described above, the application number that the applicant proposes is 201010000599.0 and is called in " pilot valve of a kind of pump unloading valve " patent a kind of automatically controlled off-load and hydraulic unloading are provided and have deposited, pressure surge value can be by setting value control, can realize No Load Start and unloaded termination of pumping, and when in automatically controlled off-load, malfunctioning or automatical control system is not charged, the pilot valve of unloading valve for the pump that hydraulic unloading is enabled automatically.But the technical problem that technique scheme exists is, automatically controlled by-pass switch valve is installed in guide valve blocks, manufacture difficulty is large, and maintenance is inconvenient, but also need to be connected with electromagnetic priority valve by transition connecting plate, overall structure more complicated; And at the automatically controlled by-pass switch valve of the external installation of pilot valve, because electromagnetic priority valve is positioned at automatically controlled by-pass switch valve below, not only take larger space, also very inconvenient from bottom servicing electromagnetic priority valve, in addition, in order to ensure the high reliability of automatically controlled off-load and hydraulic unloading, also need external one-way valve to store high pressure liquid, so that before next turn on pump, can there is high pressure liquid to go to control with the solenoid valve of the pilot valve of unloading valve, reach the object of No Load Start.In order to ensure not contained in valve the contamination of working fluid of dirt, also want external filter, because one-way valve and filter are all external, thereby make Whole Equipment size larger, also need some links, increase manufacture cost.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art part, provide a kind of simple in structure, easy to maintenance, less a kind of electromechanical double-control pilot valve for pump unloading valve takes up room.
The technical solution used in the present invention comprises mechanical pilot valve, plays secondary valve and the electromagnetic priority valve of automatically controlled by-pass switch valve action, described mechanical pilot valve comprises valve body, valve seat, spool, spring spool and voltage regulation screw, on described valve body, be processed with the valve body first liquid passage of linking up with auxiliary hole and the valve body second liquid passage of linking up with auxiliary hole and with the valve body intercommunicating pore that carrys out liquid mouth and be communicated with, described secondary valve comprises auxiliary valve body, plug-in mounting spool and secondary valve push rod, on auxiliary valve body, be processed with auxiliary valve body first liquid passage and the auxiliary valve body second liquid passage corresponding with valve body first liquid passage on valve body and valve body second liquid passage, the auxiliary valve body intercommunicating pore that is processed with auxiliary valve body the first main aperture and auxiliary valve body the second main aperture and is communicated with and is communicated with valve body intercommunicating pore with auxiliary valve body the second main aperture inner chamber on described auxiliary valve body, plug-in mounting spool and secondary valve push rod are installed in auxiliary valve body the first main aperture, the filter core of filter core being installed or being contained external accumulator rapid pipe joint seat in auxiliary valve body the second main aperture.
On described valve body, be processed with the valve body counterbore being communicated with valve body intercommunicating pore, on described auxiliary valve body, be processed with the auxiliary valve body counterbore being communicated with auxiliary valve body intercommunicating pore, form one-way valve inner chamber by described valve body counterbore and auxiliary valve body counterbore, in this one-way valve inner chamber, check valve assembly is installed.
Described plug-in mounting spool is made up of auxiliary-seat cover, auxiliary-seat, auxiliary valve core and secondary valve end cover.
Described check valve assembly comprises banking stop, one-way valve seat, steel ball, connecting sleeve and spring.
Described secondary valve is arranged on the back side of mechanical pilot valve.
Described electromagnetic priority valve be arranged on secondary valve above.
Compared with prior art, the invention has the beneficial effects as follows:
(1) owing to being processed with on valve body and the valve body intercommunicating pore that carrys out liquid mouth and be communicated with; On auxiliary valve body, be processed with the auxiliary valve body intercommunicating pore that is communicated with and is communicated with valve body intercommunicating pore with auxiliary valve body the second main aperture inner chamber, by valve body intercommunicating pore and the corresponding high pressure liquid passage that consists of electromagnetic priority valve feed flow of linking up of auxiliary valve body intercommunicating pore, do not need external high pressure liquid, structure is simpler.
(2) owing to being processed with the valve body first liquid passage of linking up with auxiliary hole and the valve body second liquid passage of linking up with auxiliary hole on valve body, on auxiliary valve body, be processed with auxiliary valve body first liquid passage and the auxiliary valve body second liquid passage corresponding with valve body first liquid passage on valve body and valve body second liquid passage, and be connected and form feed pathway by valve body first liquid passage and auxiliary valve body first liquid passage; Be connected and form back flow channel with auxiliary valve body second liquid passage by valve body second liquid passage; Made the secondary valve of automatically controlled by-pass switch valve action be independent of outside mechanical pilot valve and electromagnetic priority valve has been placed on to the secondary valve of automatically controlled by-pass switch valve action above become a reality, dwindle the overall dimensions of this valve and reduced manufacture difficulty, also easily failure judgement occurs on secondary valve or occurs on mechanical pilot valve, for maintenance has brought convenience;
(3) owing to being processed with auxiliary valve body the first main aperture and auxiliary valve body the second main aperture on auxiliary valve body, in auxiliary valve body the first main aperture, plug-in mounting spool is installed, the secondary valve that makes to have keeped in repair automatically controlled by-pass switch valve action is more convenient, the filter core of filter core being installed or being contained external accumulator rapid pipe joint seat in auxiliary valve body the second main aperture, make the present invention not need external filter, self has filter function;
(4) owing to being processed with the valve body counterbore being communicated with valve body intercommunicating pore on valve body, on auxiliary valve body, be processed with the auxiliary valve body counterbore being communicated with auxiliary valve body intercommunicating pore, form one-way valve inner chamber by described valve body counterbore and auxiliary valve body counterbore, in this one-way valve inner chamber, check valve assembly is installed, forming is the high pressure liquid passage of electromagnetic priority valve feed flow with one-way valve, make the present invention not need external one-way valve, self has non-return valve function.
Brief description of the drawings
Fig. 1 is structural drawing of the present invention,
Fig. 2 is the A-A sectional view of Fig. 1,
Fig. 3 is the structural drawing of band one-way valve of the present invention,
Fig. 4 is the C-C sectional view of Fig. 3
Fig. 5 is the B portion enlarged view of Fig. 3.
In figure:
1. mechanical pilot valve,
1-1. valve body,
1-1-1. valve body first liquid passage, 1-1-2. valve body second liquid passage,
1-1-3. valve body counterbore, 1-1-4. valve body intercommunicating pore,
1-2. valve seat,
1-3. spool,
1-4. spring spool,
1-5. voltage regulation screw,
2. secondary valve,
2-1. auxiliary valve body,
2-1-1. auxiliary valve body first liquid passage, 2-1-2. auxiliary valve body second liquid passage,
The secondary valve feed flow of 2-1-3. hole, 2-1-4. auxiliary valve body counterbore,
The secondary valve intercommunicating pore of 2-1-5., the secondary valve push rod of 2-1-6. control hole,
2-2. plug-in mounting spool,
2-2-1. auxiliary-seat cover, 2-2-2. auxiliary-seat,
2-2-3. auxiliary valve core, the secondary valve end of 2-2-4. cover,
The secondary valve push rod of 2-3.,
2-4. filter core,
The filter core that 2-5. contains accumulator rapid pipe joint seat, 2-5-1. accumulator rapid pipe joint seat,
3. electromagnetic priority valve,
4. check valve assembly,
4-1. banking stop, 4-2, one-way valve seat,
4-3. steel ball, 4-4. spring, 4-5. connecting sleeve.
Embodiment
Provide the specific embodiment of the present invention below in conjunction with accompanying drawing.
Embodiment 1
As shown in drawings, the present invention includes secondary valve 2 and the electromagnetic priority valve 3 of mechanical pilot valve 1, an automatically controlled by-pass switch valve action, described secondary valve 2 is arranged on the back side of mechanical pilot valve 1, described electromagnetic priority valve 3 be arranged on secondary valve 2 above, described mechanical pilot valve 1 comprises valve body 1-1, valve seat 1-2, spool 1-3, spring spool 1-4 and voltage regulation screw 1-5, on described valve body 1-1, be processed with the valve body first liquid passage 1-1-1 linking up with auxiliary hole and the valve body second liquid passage 1-1-2 linking up with auxiliary hole and with the valve body intercommunicating pore 1-1-3 that carrys out liquid mouth 1-1-5 and be communicated with, described secondary valve 2 comprises auxiliary valve body 2-1, plug-in mounting spool 2-2 and secondary valve push rod 2-3, on auxiliary valve body 2-1, be processed with auxiliary valve body first liquid passage 2-1-1 and the auxiliary valve body second liquid passage 2-1-2 corresponding with valve body first liquid passage 1-1-1 on valve body 1-1 and valve body second liquid passage 1-1-2, the auxiliary valve body intercommunicating pore 2-1-5 and the secondary valve push rod control hole 2-1-6 that on described auxiliary valve body 2-1, are processed with auxiliary valve body the first main aperture 2-1-3 and auxiliary valve body the second main aperture 2-1-4 and are communicated with auxiliary valve body the second main aperture 2-1-4 inner chamber and are communicated with valve body intercommunicating pore 1-1-3, plug-in mounting spool 2-2 and secondary valve push rod 2-3 are installed in auxiliary valve body the first main aperture 2-1-3, described plug-in mounting spool 2-2 overlaps 2-2-1 by auxiliary-seat, auxiliary-seat 2-2-2, auxiliary valve core 2-2-3 and secondary valve end cover 2-2-4 composition, in auxiliary valve body the second main aperture 2-1-4, filter core 2-4 is installed.
Embodiment 2
On the basis of embodiment 1, the filter core 2-4 installing is replaced by the filter core 2-5 that contains accumulator rapid pipe joint seat 2-5-1 in auxiliary valve body the second main aperture 2-1-4.
Embodiment 3
On the basis of embodiment 1 or embodiment 2, on described valve body 1-1, be processed with the valve body counterbore 1-1-4 being communicated with valve body intercommunicating pore 1-1-3, on described auxiliary valve body 2-1, be processed with the auxiliary valve body counterbore 2-1-6 being communicated with auxiliary valve body intercommunicating pore 2-1-5, form one-way valve inner chamber by described valve body counterbore 1-1-3 and auxiliary valve body counterbore 2-1-6, in this one-way valve inner chamber, check valve assembly 4 is installed, described check valve assembly 4 comprises banking stop 4-1, one-way valve seat 4-2, steel ball 4-3, connecting sleeve 4-4 and spring 4-5.
High pressure liquid enters valve body intercommunicating pore 1-1-3 through carrying out liquid mouth 1-1-5, enter again auxiliary valve body intercommunicating pore 2-1-5, and then enter auxiliary valve body the second main aperture 2-1-4, and then after filtering, filter core 2-4 enters the liquid entering hole of electromagnetic priority valve 3, in the time that electromagnet is given electricity, the high pressure liquid of electromagnetic priority valve 3 liquid entering holes arrives secondary valve push rod control hole 2-1-6 through the working hole of electromagnetic priority valve, and then promote secondary valve push rod 2-3, auxiliary valve core 2-2-3 leaves auxiliary-seat 2-2-2, thereby feed pathway and back flow channel are communicated with, reach the object of off-load, in the time of electromagnet power-off, electromagnetic priority valve liquid entering hole be cut off being communicated with of working hole of electromagnetic priority valve, simultaneously, the working hole of electromagnetic priority valve and the liquid return hole of electromagnetic priority valve are linked up, cause the high pressure liquid of controlling secondary valve push rod 2-3 to be arranged from the liquid return hole of electromagnetic priority valve, and then make auxiliary valve core 2-2-3 and auxiliary-seat 2-2-2 closure, thereby cut off feed pathway and back flow channel, reach the object that stops off-load, recover the function of feed flow.
In the situation that the present invention has one-way valve, working procedure is same as described above, and difference is, in the time that high pressure liquid is carried out liquid mouth 1-1-5 decompression, in auxiliary valve body the second main aperture 2-1-4, still have pressure, can ensure electromagnetic priority valve work; When the filter core 2-4 installing in auxiliary valve body the second main aperture 2-1-4 is replaced by after the filter core 2-5 that contains accumulator rapid pipe joint seat 2-5-1, in the time that auxiliary valve body the second main aperture 2-1-4 internal pressure has leakage, can be by external accumulator to auxiliary valve body the second main aperture 2-1-4 fluid infusion, thereby ensure that electromagnetic priority valve has enough pressure liquid to maintain off-load startup in the time starting pump, reach the object of No Load Start pump.
Claims (9)
1. the electromechanical double-control pilot valve for unloading valve, comprise mechanical pilot valve (1), play secondary valve (2) and the electromagnetic priority valve (3) of automatically controlled by-pass switch valve action, described mechanical pilot valve (1) comprises valve body (1-1), valve seat (1-2), spool (1-3), spring spool (1-4) and voltage regulation screw (1-5), it is characterized in that, on described valve body (1-1), be processed with the valve body first liquid passage (1-1-1) of linking up with auxiliary hole and the valve body second liquid passage (1-1-2) of linking up with auxiliary hole and with the valve body intercommunicating pore (1-1-3) that carrys out liquid mouth (1-1-5) and be communicated with, described secondary valve (2) comprises auxiliary valve body (2-1), plug-in mounting spool (2-2) and secondary valve push rod (2-3), on auxiliary valve body (2-1), be processed with auxiliary valve body first liquid passage (2-1-1) and the auxiliary valve body second liquid passage (2-1-2) corresponding with valve body first liquid passage (1-1-1) on valve body (1-1) and valve body second liquid passage (1-1-2), the auxiliary valve body intercommunicating pore (2-1-5) that is processed with auxiliary valve body the first main aperture (2-1-3) and auxiliary valve body the second main aperture (2-1-4) and is communicated with and is communicated with valve body intercommunicating pore (1-1-3) with auxiliary valve body the second main aperture (2-1-4) inner chamber on described auxiliary valve body (2-1), by valve body intercommunicating pore and the corresponding high pressure liquid passage that consists of electromagnetic priority valve feed flow of linking up of auxiliary valve body intercommunicating pore, plug-in mounting spool (2-2) and secondary valve push rod (2-3) are installed in auxiliary valve body the first main aperture (2-1-3), filter core is installed in auxiliary valve body the second main aperture (2-1-4).
2. the electromechanical double-control pilot valve for unloading valve as claimed in claim 1, is characterized in that, described filter core contains accumulator rapid pipe joint seat (2-5-1).
3. the electromechanical double-control pilot valve for unloading valve according to claim 1 and 2, it is characterized in that, on described valve body (1-1), be processed with the valve body counterbore (1-1-4) being communicated with valve body intercommunicating pore (1-1-3), on described auxiliary valve body (2-1), be processed with the auxiliary valve body counterbore (2-1-6) being communicated with auxiliary valve body intercommunicating pore (2-1-5), form one-way valve inner chamber by described valve body counterbore (1-1-3) and auxiliary valve body counterbore (2-1-6), check valve assembly (4) is installed in this one-way valve inner chamber.
4. the electromechanical double-control pilot valve for unloading valve according to claim 1 and 2, it is characterized in that, described plug-in mounting spool (2-2) is made up of auxiliary-seat cover (2-2-1), auxiliary-seat (2-2-2), auxiliary valve core (2-2-3) and secondary valve end cover (2-2-4).
5. the electromechanical double-control pilot valve for unloading valve according to claim 3, it is characterized in that, described check valve assembly (4) comprises banking stop (4-1), one-way valve seat (4-2), steel ball (4-3), connecting sleeve (4-4) and spring (4-5).
6. the electromechanical double-control pilot valve for unloading valve according to claim 1 and 2, is characterized in that, described secondary valve (2) is arranged on the back side of mechanical pilot valve (1).
7. the electromechanical double-control pilot valve for unloading valve according to claim 1 and 2, is characterized in that, described electromagnetic priority valve (3) be arranged on secondary valve (2) above.
8. the electromechanical double-control pilot valve for unloading valve according to claim 3, is characterized in that, described secondary valve (2) is arranged on the back side of mechanical pilot valve (1).
9. the electromechanical double-control pilot valve for unloading valve according to claim 3, is characterized in that, described electromagnetic priority valve (3) be arranged on secondary valve (2) above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210245380.6A CN102777663B (en) | 2012-07-13 | 2012-07-13 | Electro-mechanical dual control pilot valve for unloading valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210245380.6A CN102777663B (en) | 2012-07-13 | 2012-07-13 | Electro-mechanical dual control pilot valve for unloading valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102777663A CN102777663A (en) | 2012-11-14 |
| CN102777663B true CN102777663B (en) | 2014-09-24 |
Family
ID=47122693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210245380.6A Active CN102777663B (en) | 2012-07-13 | 2012-07-13 | Electro-mechanical dual control pilot valve for unloading valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102777663B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104989690B (en) * | 2015-06-29 | 2017-02-01 | 象山盛韵汽配科技有限公司 | Overload relief valve |
| DE102019121090A1 (en) * | 2019-08-05 | 2021-02-11 | ECO Holding 1 GmbH | Actuator for a hydraulic valve and hydraulic valve |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3743345A1 (en) * | 1987-12-21 | 1989-06-29 | Bosch Gmbh Robert | Proportionally working pressure relief valve |
| CN1039288A (en) * | 1989-07-24 | 1990-01-31 | 权宇 | Composite control valve of pressure and flow proportional to electric current |
| CN1424514A (en) * | 2003-01-02 | 2003-06-18 | 宁波华液机器制造有限公司 | Differential pressure proportional pressure and flow composite valves |
| CN2906159Y (en) * | 2006-02-11 | 2007-05-30 | 中国矿业大学 | Electrohydraulic unloading valve with hydraulic control and electrohydraulic control operation modes |
| JP4162278B2 (en) * | 1997-07-29 | 2008-10-08 | 豊興工業株式会社 | Hydraulic control valve |
| CN101749255A (en) * | 2010-01-14 | 2010-06-23 | 北京天地玛珂电液控制系统有限公司 | Pilot valve of pump unloading valve |
| CN101761470A (en) * | 2010-01-14 | 2010-06-30 | 北京天地玛珂电液控制系统有限公司 | Closing-storing and unloading control valve for sudden-stop of bump |
| CN201671900U (en) * | 2010-05-19 | 2010-12-15 | 煤炭科学研究总院太原研究院 | Electromagnetic unloading valve of emulsion pump station |
| CN202674472U (en) * | 2012-07-13 | 2013-01-16 | 北京天地玛珂电液控制系统有限公司 | Mechanically and electrically controlled pilot valve for unloading valve |
-
2012
- 2012-07-13 CN CN201210245380.6A patent/CN102777663B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3743345A1 (en) * | 1987-12-21 | 1989-06-29 | Bosch Gmbh Robert | Proportionally working pressure relief valve |
| CN1039288A (en) * | 1989-07-24 | 1990-01-31 | 权宇 | Composite control valve of pressure and flow proportional to electric current |
| JP4162278B2 (en) * | 1997-07-29 | 2008-10-08 | 豊興工業株式会社 | Hydraulic control valve |
| CN1424514A (en) * | 2003-01-02 | 2003-06-18 | 宁波华液机器制造有限公司 | Differential pressure proportional pressure and flow composite valves |
| CN2906159Y (en) * | 2006-02-11 | 2007-05-30 | 中国矿业大学 | Electrohydraulic unloading valve with hydraulic control and electrohydraulic control operation modes |
| CN101749255A (en) * | 2010-01-14 | 2010-06-23 | 北京天地玛珂电液控制系统有限公司 | Pilot valve of pump unloading valve |
| CN101761470A (en) * | 2010-01-14 | 2010-06-30 | 北京天地玛珂电液控制系统有限公司 | Closing-storing and unloading control valve for sudden-stop of bump |
| CN201671900U (en) * | 2010-05-19 | 2010-12-15 | 煤炭科学研究总院太原研究院 | Electromagnetic unloading valve of emulsion pump station |
| CN202674472U (en) * | 2012-07-13 | 2013-01-16 | 北京天地玛珂电液控制系统有限公司 | Mechanically and electrically controlled pilot valve for unloading valve |
Non-Patent Citations (1)
| Title |
|---|
| JP特许第4162278号B2 2008.10.08 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102777663A (en) | 2012-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101943202B (en) | Link bolt with pilot type reducing valve | |
| CN107013534B (en) | Aero-engine key component inertia friction welder fluid power system | |
| CN102777663B (en) | Electro-mechanical dual control pilot valve for unloading valve | |
| CN202674472U (en) | Mechanically and electrically controlled pilot valve for unloading valve | |
| CN201776935U (en) | Hydraulic machine with two sets of hydraulic system structures | |
| CN104806406A (en) | Normally closed electro-mechanical hybrid high-pressure oil pump | |
| CN212131139U (en) | Emergency oil discharge device for hydraulic station | |
| CN102678650B (en) | Double-pump converging oil-filling valve | |
| CN102482930B (en) | Pump for pumping hydraulic well control fluid into a prosuction flowline | |
| CN201650928U (en) | Hydraulic system | |
| CN201696384U (en) | Control valve special for hydraulic lifting and descending of plunger cylinder | |
| CN205225915U (en) | Electronic round large -scale tipper pressurizes and off -load control integration system | |
| CN201582241U (en) | Unloading valve for electro-hydraulic double control pump | |
| CN101893007B (en) | Plunger case lifting hydraulic control system | |
| CN204677346U (en) | The electromechanical combined formula high pressure oil pump of normal close type | |
| CN204175686U (en) | A kind of bender hydraulic system | |
| CN104847512B (en) | Control module for common-rail fuel injection | |
| CN202674463U (en) | Pilot valve with mechanical and electric control functions for unloading valve for pump | |
| CN201615069U (en) | Pilot valve of unloading valve used for pumps | |
| CN204704187U (en) | Overload unloading valve | |
| CN102777658B (en) | For pump unloading valve have machinery with the bifunctional pilot valve of Electronic control | |
| CN204677345U (en) | The normally closed electronically controlled unit pump of double-action | |
| CN204895439U (en) | Underground scraper braking system with starter protect function | |
| CN204003676U (en) | Pressurized machine surges | |
| CN201843881U (en) | Hinged bolt with pilot-operated reducing valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171117 Address after: 100013, Beijing, Hepingli, Chaoyang District Youth ditch East Road, No. 5 World Building, Beijing Tiandi electric hydraulic control system Co., Ltd. Co-patentee after: BEIJING MEIKETIANMA AUTOMATION TECHNOLOGY CO., LTD. Patentee after: Beijing Tiandi-marco Electro-hydraulic Control System Co., Ltd. Address before: 100013 Beijing, Hepingli Youth ditch East Road, No. 5, building a layer of heaven and earth Patentee before: Beijing Tiandi-marco Electro-hydraulic Control System Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Beijing Tiandi Marco Electro-hydraulic Control System Co., Ltd., Tiandi building, No. 5 qingniangou East Road, Hepingli, Chaoyang District, Beijing 100013 Patentee after: Beijing Tianma Zhikong Technology Co.,Ltd. Patentee after: Beijing coal technology Tianma Automation Technology Co., Ltd Address before: Beijing Tiandi Marco Electro-hydraulic Control System Co., Ltd., Tiandi building, No. 5 qingniangou East Road, Hepingli, Chaoyang District, Beijing 100013 Patentee before: BEIJING TIANDI-MARCO ELECTRO-HYDRAULIC CONTROL SYSTEM Co.,Ltd. Patentee before: Beijing coal technology Tianma Automation Technology Co., Ltd |
|
| CP01 | Change in the name or title of a patent holder |