CN109210381B - Oil pipeline variable frequency pump and regulating valve combined pressure regulating device - Google Patents
Oil pipeline variable frequency pump and regulating valve combined pressure regulating device Download PDFInfo
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- CN109210381B CN109210381B CN201811303102.5A CN201811303102A CN109210381B CN 109210381 B CN109210381 B CN 109210381B CN 201811303102 A CN201811303102 A CN 201811303102A CN 109210381 B CN109210381 B CN 109210381B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a combined pressure regulating device of an oil pipeline variable frequency pump and a regulating valve, which comprises the following components: a process line having a first pressure transmitter, a first pressure indicator, a first process gate valve, a second pressure transmitter, a second pressure indicator, a variable frequency governor pump, a third pressure indicator, a third pressure transmitter, a second process gate valve, a fourth pressure transmitter, a fourth pressure indicator, a first process ball valve, a fifth pressure indicator, a regulator valve, a sixth pressure indicator, a second process ball valve, and a fifth pressure transmitter disposed thereon; a bypass line having one end connected between the first pressure indicator and the first process gate valve and the other end connected between the second process gate valve and the fourth pressure transmitter, and having a check valve connected along the flow direction of the oil; the pressure control device comprises two control components for manually/automatically controlling the variable-frequency speed regulating pump and the regulating valve. The invention has the beneficial effects that: and the continuity, accuracy, agility, stability and safety of the control of the inlet and outlet pressure of the pump station are improved.
Description
Technical Field
The invention relates to the technical field of oil pipelines, in particular to a combined pressure regulating device of an oil pipeline variable frequency pump and a regulating valve.
Background
In an oil pipeline station, the flow and the pressure of an oil pipeline are required to be detected and controlled in order to meet the normal operation of the pipeline. In the past, two methods are mainly adopted for adjusting the pressure of the pump station in and out: according to the pressure sensor of the inlet and outlet stations, the rotating speed of the variable-frequency speed regulating pump is regulated by two paths of PID controllers of the inlet and outlet stations, so that the inlet and outlet pressure of the pump station is controlled; according to the second method, the opening degree of the outlet regulating valve of the main pump is regulated by two paths of PID controllers of the inlet and outlet according to the pressure sensor of the inlet and outlet, so that the inlet and outlet pressure of the pump station is controlled.
With the popularization of the frequency converter technology, a great deal of frequency conversion speed regulation pumps are used, and more oil delivery stations are equipped with two pressure regulation devices, namely the frequency conversion speed regulation pumps and the regulating valves. If the PID control is simply applied to all the two voltage regulating devices, the system is unstable, and the two different voltage regulating devices can interfere with each other and vibrate by the same pressure set value. Currently, the common solution is that when the variable-frequency speed regulating pump is operated under PID pressure control, the manual valve position of the regulating valve is controlled; and when the PID pressure of the regulating valve is controlled, the manual rotating speed of the variable-frequency speed regulating pump is controlled. In the two pressure regulating devices, namely the variable frequency speed regulating pump and the regulating valve, only one device can use PID pressure control.
This method has the following disadvantages: 1. the variable frequency speed control pump has a smaller PID pressure control range, only supports the range from the lowest rotating speed to the highest rotating speed, and cannot regulate the full lift range of the variable frequency speed control pump; 2. the pressure of the variable frequency speed regulating pump is still too high when the lowest rotating speed is reduced, the variable frequency speed regulating pump is required to be manually set at the lowest rotating speed, and the regulating valve is switched to PID pressure control to continue regulating the pressure, and the process can only be manually completed; 3. under the manual rotation speed control of the variable frequency speed regulating pump, after the PID pressure control of the regulating valve is fully opened, the pressure cannot reach a set value, and the rotation speed of the pump still has residual force, the regulating valve must be manually switched to the manual valve position to be fully opened, and the variable frequency speed regulating pump is switched to the PID pressure control.
In general, the cooperation pressure regulation of the variable frequency speed control pump and the regulating valve is completed manually, which is time-consuming and labor-consuming, and has the risks of insufficient switching operation and misoperation.
Disclosure of Invention
In order to solve the problems, the invention aims to provide the combined pressure regulating device for the variable frequency pump and the regulating valve of the oil pipeline, which realizes the combined pressure regulating control of the variable frequency speed regulating pump and the regulating valve, improves the continuity, accuracy, agility, stability and safety of the control of the inlet and outlet pressure of the pump station and is convenient to operate and run.
The invention provides a combined pressure regulating device of an oil pipeline variable frequency pump and a regulating valve, which comprises the following components:
the two ends of the process pipeline are respectively connected with a first flange and a second flange, and a first pressure transmitter, a first pressure indicator, a first process gate valve, a second pressure transmitter, a second pressure indicator, a variable-frequency speed regulating pump, a third pressure indicator, a third pressure transmitter, a second process gate valve, a fourth pressure transmitter, a fourth pressure indicator, a first process ball valve, a fifth pressure indicator, a regulating valve, a sixth pressure indicator, a second process ball valve and a fifth pressure transmitter are sequentially arranged between the first flange and the second flange;
a bypass line having one end connected to the process line between the first pressure indicator and the first process gate valve and the other end connected to the process line between the second process gate valve and the fourth pressure transmitter, the bypass line having a check valve connected thereto in the oil flow direction;
the pressure control device comprises a first control component for manually/automatically controlling the variable-frequency speed regulating pump and a second control component for manually/automatically controlling the regulating valve.
As a further improvement of the present invention, the first control assembly includes: the system comprises a first pressure controller connected with the first pressure transmitter, a fourth pressure controller connected with the fifth pressure transmitter, a first low-selection controller connected with the first pressure controller and the fourth pressure controller, and a first manual/automatic change-over switch connected with the first low-selection controller and the variable-frequency speed regulating pump.
As a further development of the invention, the first pressure controller is connected to the first pressure transmitter via a first meter cable, and the fourth pressure controller is connected to the fifth pressure transmitter via a fourth meter cable.
As a further improvement of the present invention, the first low-selection controller is connected to the first pressure controller through a fifth meter cable, and the first low-selection controller is connected to the fourth pressure controller through an eighth meter cable.
As a further improvement of the present invention, the first manual/automatic change-over switch is connected to the first low-selection controller through a ninth meter cable, and the first manual/automatic change-over switch is connected to the variable-frequency speed pump through an eleventh meter cable.
As a further improvement of the present invention, the second control assembly includes: a second pressure controller connected to the first pressure transmitter, a third pressure controller connected to the fifth pressure transmitter, a second low-selection controller connected to the second pressure controller and the third pressure controller, and a second hand/automatic change-over switch connected to the second low-selection controller and the regulator valve.
As a further development of the invention, the second pressure controller is connected to the first pressure transmitter via a second meter cable, and the third pressure controller is connected to the fifth pressure transmitter via a third meter cable.
As a further improvement of the present invention, the second low-selection controller is connected to the second pressure controller through a sixth meter cable, and the second low-selection controller is connected to the third pressure controller through a seventh meter cable.
As a further improvement of the present invention, the second hand/automatic switching switch is connected to the second low selection controller through a tenth meter cable, and the second hand/automatic switching switch is connected to the regulating valve through a twelfth meter cable.
As a further improvement of the invention, the variable frequency speed control pump is a centrifugal pump.
The beneficial effects of the invention are as follows:
the first manual/automatic change-over switch and the second manual/automatic change-over switch are operated, so that the combined pressure regulation mode of the variable-frequency speed regulating pump and the regulating valve is flexible and changeable;
the low-selection protection, namely the low-selection controller is applied to two pressure regulating devices, namely a variable-frequency speed regulating pump and a regulating valve, so that the risks of no ultrahigh outbound pressure and no ultralow inbound pressure of an oil pipeline station are greatly reduced;
through different pressure setting values, the variable-frequency speed regulating pump and the pressure regulating valve can simultaneously use PID pressure control, thereby realizing online hot standby, greatly improving the stability, instantaneity and reliability of pressure control of an oil pipeline station, and having high control precision, high speed, stable operation and convenient realization and maintenance;
on the premise of ensuring the energy-saving pressure of the variable-frequency speed-regulating pump to be used preferentially, the automatic intervention of the pressure regulating valve when the pressure regulation of the variable-frequency speed-regulating pump is insufficient is realized, and the pressure regulating function of the regulating valve is supplemented;
not only saves energy, but also makes up for the short plates with small pressure regulating range, enhances the operation efficiency and safety of the whole combined pressure regulating device, and simultaneously optimizes energy conservation.
Drawings
Fig. 1 is a schematic structural diagram of an oil pipeline variable frequency pump and regulating valve combined pressure regulating device according to an embodiment of the invention.
In the drawing the view of the figure,
1. a first flange; 2. a process line; 3. a first process gate valve; 4. a variable frequency speed regulating pump; 5. a second process gate valve; 6. a bypass line; 7. a check valve; 8. a first process ball valve; 9. a regulating valve; 10. a second process ball valve; 11. a second flange; 12. a first pressure transmitter; 13. a first pressure indicator; 14. a second pressure transmitter; 15. a second pressure indicator; 16. a third pressure indicator; 17. a third pressure transmitter; 18. a fourth pressure transmitter; 19. a fourth pressure indicator; 20. a fifth pressure indicator; 21. a sixth pressure indicator; 22. a fifth pressure transmitter; 23. a first pressure controller; 24. a second pressure controller; 25. a third pressure controller; 26. a fourth pressure controller; 27. a first low selection controller; 28. a second low selection controller; 29. a first manual/automatic change-over switch; 30. a second hand/automatic transfer switch; 31. a first meter cable; 32. a second meter cable; 33. a third meter cable; 34. a fourth meter cable; 35. a fifth meter cable; 36. a sixth meter cable; 37. a seventh meter cable; 38. an eighth meter cable; 39. a ninth meter cable; 40. a tenth meter cable; 41. an eleventh meter cable; 42. a twelfth meter cable.
Detailed Description
The invention will now be described in further detail with reference to specific examples thereof in connection with the accompanying drawings.
As shown in fig. 1, a device for adjusting pressure by combining an oil pipeline variable frequency pump and a regulating valve according to an embodiment of the present invention includes:
the two ends of the process pipeline 2 are respectively connected with a first flange 1 and a second flange 11, and a first pressure transmitter 12, a first pressure indicator 13, a first process gate valve 3, a second pressure transmitter 14, a second pressure indicator 15, a variable frequency speed control pump 4, a third pressure indicator 16, a third pressure transmitter 17, a second process gate valve 5, a fourth pressure transmitter 18, a fourth pressure indicator 19, a first process ball valve 8, a fifth pressure indicator 20, a regulating valve 9, a sixth pressure indicator 21, a second process ball valve 10 and a fifth pressure transmitter 22 are sequentially arranged between the first flange 1 and the second flange 11.
A bypass line 6, one end of which is connected to the process line 2 between the first pressure indicator 13 and the first process gate valve 3, and the other end of which is connected to the process line 2 between the second process gate valve 5 and the fourth pressure transmitter 18, and a check valve 7 is connected to the bypass line 6 in the oil flow direction.
The pressure control device comprises a first control component for manually/automatically controlling the variable frequency speed control pump 4 and a second control component for manually/automatically controlling the regulating valve 9.
Wherein the first control assembly comprises: a first pressure controller 23 connected to first pressure transmitter 12, a fourth pressure controller 26 connected to fifth pressure transmitter 22, a first low-selection controller 27 connected to first pressure controller 23 and fourth pressure controller 26, and a first manual/automatic change-over 29 connected to first low-selection controller 27 and variable-frequency governor pump 4. First pressure controller 23 is coupled to first pressure transmitter 12 via a first meter cable 31 and fourth pressure controller 26 is coupled to fifth pressure transmitter 22 via a fourth meter cable 34. The first low selection controller 27 is connected to the first pressure controller 23 via a fifth meter cable 35, and the first low selection controller 27 is connected to the fourth pressure controller 26 via an eighth meter cable 38. The first manual/automatic change-over switch 29 is connected to the first low-selection controller 27 through a ninth meter cable 39, and the first manual/automatic change-over switch 29 is connected to the variable-frequency governor pump 4 through an eleventh meter cable 41.
The second control assembly includes: a second pressure controller 24 connected to first pressure transmitter 12, a third pressure controller 25 connected to fifth pressure transmitter 22, a second low-selection controller 28 connected to second pressure controller 24 and third pressure controller 25, and a second manual/automatic change-over switch 30 connected to second low-selection controller 28 and regulator valve 9. Second pressure controller 24 is coupled to first pressure transmitter 12 via a second meter cable 32 and third pressure controller 25 is coupled to fifth pressure transmitter 22 via a third meter cable 33. The second low selection controller 28 is connected to the second pressure controller 24 by a sixth meter cable 36 and the second low selection controller 28 is connected to the third pressure controller 25 by a seventh meter cable 37. The second hand/automatic selector switch 30 is connected to the second low selection controller 28 through a tenth meter cable 40, and the second hand/automatic selector switch 30 is connected to the regulator valve 9 through a twelfth meter cable 42.
The variable-frequency speed regulating pump 4 is a centrifugal pump, can have various control options, has a compact structure, wide flow range and wide lift range, is suitable for an oil pipeline, has uniform flow, stable operation and small vibration, does not need a special damping foundation, and has lower equipment installation, maintenance and overhaul cost.
The oil pipeline variable frequency pump and regulating valve combined pressure regulating device can switch the application state of PID pressure control of the variable frequency speed regulating pump 4 and the regulating valve 9 through the operation of two manual/automatic change-over switches. According to the application state of PID pressure control, the whole oil pipeline variable frequency pump and regulating valve combined pressure regulating device has four working modes: (1) Manual rotation speed control of the variable-frequency speed regulating pump and manual valve position control of the regulating valve; (2) Automatic pressure control of the variable-frequency speed regulating pump and manual valve position control of the regulating valve; (3) Manual rotation speed control of the variable-frequency speed regulating pump and automatic pressure control of the regulating valve; (4) Automatic pressure control of variable-frequency speed regulating pump and automatic pressure control of regulating valve.
When the variable frequency speed control pump 4 adopts manual rotation speed control, the rotation speed of the variable frequency speed control pump 4 is directly set through the first manual/automatic change-over switch 29, and is output to the variable frequency speed control pump 4 for execution. When the variable frequency speed control pump 4 adopts automatic pressure control, the first pressure controller 23 and the fourth pressure controller 26 respectively calculate different pump rotational speeds, and the first low selection controller 27 selects a smaller pump rotational speed from the outputs of the first pressure controller 23 and the fourth pressure controller 36 to output to the variable frequency speed control pump 4 for execution. When the control mode of the variable frequency speed control pump 4 is switched from manual to automatic pressure control, the fourth pressure controller 26 needs to be switched without disturbance, the first pressure controller 23 does not need to be subjected to disturbance-free treatment, and the variable frequency speed control pump 4 is ensured to be in the control mode of the fourth pressure controller 23 when the control mode is switched from manual to automatic pressure control.
When the manual valve position control is adopted for the regulating valve 9, the valve position opening of the regulating valve 9 is directly set through the second hand/automatic switching switch 30, and is output to the regulating valve 9 for execution. When the regulating valve 9 adopts automatic pressure control, the second pressure controller 24 and the third pressure controller 25 respectively calculate different valve position opening degrees, and the second low-selection controller 30 selects a smaller valve position opening degree from the outputs of the second pressure controller 24 and the third pressure controller 25 to output to the regulating valve 9 for execution. When the control mode of the regulating valve 9 is switched from manual to automatic pressure control, the third pressure controller 25 needs to be switched in a non-disturbance manner, and the second pressure controller 24 does not need to be subjected to non-disturbance treatment, so that the regulating valve 9 is in the control mode of the third pressure controller 25 when the control mode is switched from manual to automatic pressure control.
When the variable frequency speed regulating pump 4 operates and the variable frequency speed regulating pump 4 and the regulating valve 9 are both in PID automatic pressure control, a combined pressure regulating mode needs to be started. After the combined voltage regulation mode is put into use, the pressure set value of the second pressure controller 24 is calculated on the basis of the pressure set value of the first pressure controller 23, namely, the pressure set value of the first pressure controller 23 is SP1, and the pressure set value of the second pressure controller 24 is SP 1-delta P1. The pressure set value of the third pressure controller 25 is calculated based on the pressure set value of the fourth pressure controller 26, that is, the pressure set value of the fourth pressure controller 26 is SP2, and the pressure set value of the third pressure controller 25 is SP2+ [ delta ] P2. Typically Δp1=0.05 MPa, Δp2=0.1 MPa. When the variable frequency speed regulating pump 4 is stopped or the manual rotation speed of the variable frequency speed regulating pump 4 is controlled or the manual valve position of the regulating valve 9 is controlled, the combined pressure regulating mode is automatically released.
The skid-mounted outdoor design has the protection grade of IP65 and the explosion-proof grade of EXdIIBT4, and completely meets the outdoor environment and field explosion-proof requirements. The device is connected with the process pipeline by adopting a standard flange, and is suitable for the working condition of high pressure.
The device realizes timely automatic intervention of the pressure regulating valve when the pressure regulation of the variable frequency speed regulating pump is insufficient under the premise of ensuring the energy-saving pressure of the variable frequency speed regulating pump to be preferentially used, and supplements the pressure regulating function of the regulating valve. The device not only saves energy, but also makes up for the short plate with small pressure regulating range, enhances the operation efficiency and safety of the whole pressure control system, and simultaneously optimizes energy conservation.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an oil pipeline variable frequency pump and governing valve unite pressure regulating device which characterized in that includes:
the two ends of the process pipeline (2) are respectively connected with a first flange (1) and a second flange (11), and a first pressure transmitter (12), a first pressure indicator (13), a first process gate valve (3), a second pressure transmitter (14), a second pressure indicator (15), a variable-frequency speed pump (4), a third pressure indicator (16), a third pressure transmitter (17), a second process gate valve (5), a fourth pressure transmitter (18), a fourth pressure indicator (19), a first process ball valve (8), a fifth pressure indicator (20), a regulating valve (9), a sixth pressure indicator (21), a second process ball valve (10) and a fifth pressure transmitter (22) are sequentially arranged between the first flange (1) and the second flange (11);
a bypass line (6) with one end connected to the process line (2) between the first pressure indicator (13) and the first process gate valve (3), the other end of the bypass line (6) being connected to the process line (2) between the second process gate valve (5) and the fourth pressure transmitter (18), the bypass line (6) being connected with a check valve (7) in the oil flow direction;
a pressure control device comprising a first control assembly for manual/automatic control of the variable frequency speed pump (4) and a second control assembly for manual/automatic control of the regulating valve (9); the first control assembly includes: a first pressure controller (23) connected to the first pressure transmitter (12), a fourth pressure controller (26) connected to the fifth pressure transmitter (22), a first low-selection controller (27) connected to the first pressure controller (23) and the fourth pressure controller (26), and a first manual/automatic change-over switch (29) connected to the first low-selection controller (27) and the variable-frequency governor pump (4); the second control assembly includes: a second pressure controller (24) connected to the first pressure transmitter (12), a third pressure controller (25) connected to the fifth pressure transmitter (22), a second low-selection controller (28) connected to the second pressure controller (24) and the third pressure controller (25), and a second manual/automatic change-over switch (30) connected to the second low-selection controller (28) and the regulating valve (9).
2. The oil pipeline variable frequency pump and regulating valve combined pressure regulating device according to claim 1, wherein the first pressure controller (23) is connected with the first pressure transmitter (12) through a first instrument cable (31), and the fourth pressure controller (26) is connected with the fifth pressure transmitter (22) through a fourth instrument cable (34).
3. An oil pipeline variable frequency pump and regulating valve combined pressure regulating device according to claim 1, characterized in that the first low-selection controller (27) is connected with the first pressure controller (23) through a fifth instrument cable (35), and the first low-selection controller (27) is connected with the fourth pressure controller (26) through an eighth instrument cable (38).
4. An oil pipeline variable frequency pump and regulating valve combined pressure regulating device according to claim 1, characterized in that the first manual/automatic change-over switch (29) is connected with the first low-selection controller (27) through a ninth meter cable (39), and the first manual/automatic change-over switch (29) is connected with the variable frequency speed regulating pump (4) through an eleventh meter cable (41).
5. The oil pipeline variable frequency pump and regulating valve combined pressure regulating device according to claim 1, wherein the second pressure controller (24) is connected with the first pressure transmitter (12) through a second instrument cable (32), and the third pressure controller (25) is connected with the fifth pressure transmitter (22) through a third instrument cable (33).
6. An oil pipeline variable frequency pump and regulating valve combined pressure regulating device according to claim 1, characterized in that the second low-selection controller (28) is connected with the second pressure controller (24) through a sixth instrument cable (36), and the second low-selection controller (28) is connected with the third pressure controller (25) through a seventh instrument cable (37).
7. The oil pipeline variable frequency pump and regulating valve combined pressure regulating device according to claim 1, wherein the second hand/automatic change-over switch (30) is connected with the second low-selection controller (28) through a tenth meter cable (40), and the second hand/automatic change-over switch (30) is connected with the regulating valve (9) through a twelfth meter cable (42).
8. The oil delivery pipeline variable frequency pump and regulating valve combined pressure regulating device according to claim 1, wherein the variable frequency speed regulating pump (4) is a centrifugal pump.
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| CN201811303102.5A CN109210381B (en) | 2018-11-02 | 2018-11-02 | Oil pipeline variable frequency pump and regulating valve combined pressure regulating device |
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| CN201811303102.5A CN109210381B (en) | 2018-11-02 | 2018-11-02 | Oil pipeline variable frequency pump and regulating valve combined pressure regulating device |
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| CN109210381A CN109210381A (en) | 2019-01-15 |
| CN109210381B true CN109210381B (en) | 2023-07-04 |
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| CN111689455A (en) * | 2020-06-04 | 2020-09-22 | 广州发展碧辟油品有限公司 | Oil depot variable-frequency throttling combined regulation loading system and regulation and control method |
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| JPH02256802A (en) * | 1989-03-30 | 1990-10-17 | Tech Res & Dev Inst Of Japan Def Agency | Speed control method for underwater traveling body |
| CN2290768Y (en) * | 1996-09-20 | 1998-09-09 | 朱焱威 | Fuel regulation and control device of industrial furnace |
| CN201561271U (en) * | 2009-12-28 | 2010-08-25 | 中铝国际技术发展有限公司 | Conveying pipeline flow adjusting structure |
| JP2011256802A (en) * | 2010-06-10 | 2011-12-22 | Toyota Motor Corp | Variable valve system for internal combustion engine |
| CN201809806U (en) * | 2010-10-13 | 2011-04-27 | 济南水业集团有限责任公司 | Linked variable-frequency constant-pressure water supply system of pump valve |
| CN103088872A (en) * | 2013-02-01 | 2013-05-08 | 天津大学 | Water supplying system for flow device |
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| CN203452119U (en) * | 2013-08-07 | 2014-02-26 | 天津大学 | Wide-flow-range water supply system for flow device |
| CN103397678B (en) * | 2013-08-13 | 2015-07-01 | 南京工业大学 | Power matching energy-saving system and method for engine and hydraulic pump |
| JP2016217146A (en) * | 2015-05-14 | 2016-12-22 | いすゞ自動車株式会社 | Fuel injection control device |
| US20170030359A1 (en) * | 2015-07-31 | 2017-02-02 | Siemens Aktiencesellschaft | Batch change control for variable speed driven centrifugal pumps and pump systems |
| CN205748898U (en) * | 2016-06-20 | 2016-11-30 | 辽宁科技大学 | A kind of flow characteristics of regulating valve closed loop test system |
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