CN220539996U - Unit oil pressing pump outlet combined valve and oil pressing system - Google Patents
Unit oil pressing pump outlet combined valve and oil pressing system Download PDFInfo
- Publication number
- CN220539996U CN220539996U CN202321301662.3U CN202321301662U CN220539996U CN 220539996 U CN220539996 U CN 220539996U CN 202321301662 U CN202321301662 U CN 202321301662U CN 220539996 U CN220539996 U CN 220539996U
- Authority
- CN
- China
- Prior art keywords
- valve
- pressure oil
- oil pump
- pressure
- pump outlet
- 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
- 238000003825 pressing Methods 0.000 title description 10
- 230000001502 supplementing effect Effects 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 195
- 238000010586 diagram Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model discloses a combined valve for an outlet of a unit pressure oil pump and a pressure oil system, wherein the combined valve comprises a pressure oil inlet P, an oil outlet P1, an oil return port T, a main valve CV1, a one-way valve CV2, an electromagnetic bypass valve YV1 and a safety pilot valve YV2; the pressure oil system comprises the pressure oil pump outlet combination valve, a pressure oil tank, an automatic air supplementing device, a speed regulator oil return tank, a pressure oil pump, a motor, a control oil filter, an electrical control cabinet, a meter and a sensor. The unit pressure oil pump outlet combined valve solves the problem that the existing low-pressure starting valve of the oil pump outlet combined valve is limited by spring performance, oil quality and oil temperature; during operation, the oil pump outlet combined valve does not have a fault, and the combined valve operates stably after a single machine is put into operation for a week; the pressure oil pump has good operation condition, good vibration, noise and temperature rise; the motor has good running condition, and the current, the temperature rise and the vibration are all in good states; no abnormal phenomenon occurs in each unit, and the failure occurrence rate of the pressure oil pump outlet combination valve is zero.
Description
Technical Field
The utility model relates to the technical field of speed regulator pressure oil systems, unit oil pump outlet combination valves and oil pressing systems, in particular to a unit oil pump outlet combination valve and an oil pressing system.
Background
The main function of the speed regulator pressure oil system is to ensure the normal operation of the speed regulating system, and the two oil pumps work to rotate and ensure that the oil pressure of the pressure oil tank works in a normal oil pressure range. The design pressure is 6.3MPa, the opening and closing of the blade are controlled by operating the oil receiver, and the opening and closing of the guide vane are controlled by operating the servomotor.
Composition of the governor pressure oil system: a pressure oil tank, a safety valve and an automatic air supplementing device; the speed regulator returns to the oil tank; a pressure oil pump (screw pump), a motor; an oil pump outlet combination valve; controlling an oil filter; the speed regulator operates the valve and pipeline of the actuating mechanism; an electric control cabinet, a meter and a sensor. The oil pump outlet combined valve is a very important barrier between the pressure oil pump and the pressure oil tank, so that the normal pressure of the pressure oil tank is maintained, and meanwhile, the operation safety of the pressure oil pump is ensured. The performance of the oil pump outlet combined valve directly influences the performance of a speed regulator pressure oil system, thereby influencing the normal operation condition of the speed regulator, and finally influencing the safety, stability and high efficiency of unit operation, and even causing equipment accidents. The importance of the oil pump outlet combination valve throughout the governor pressure oil system is apparent.
The oil pump outlet combination valve is integrated by a check valve, a safety valve, a bypass valve and a low-pressure starting valve (a loading/unloading valve). The method has the specific effects of oil pump loading/unloading control and oil pressure overrun protection oil way check. However, in the existing production operation, the working condition of the oil pump outlet combined valve is poor, faults occur frequently, and timeliness and regularity are not provided; the maintenance work intensity is high, and operators are required to master the adjustment method of the low-pressure starting valve; the low-pressure starting valve is worn in long-term operation, the spring performance is weakened, and the valve core is not in place; the oil quality is deteriorated, and the valve core is blocked or does not move in place; each unit continuously runs, so that the displacement range of the spring of the low-pressure starting valve is difficult to adjust due to higher oil temperature; the valve block control signal is dependent on the screw pump outlet pressure value. The change of the outlet pressure value of the pressure oil pump causes the valve group adjusting parameters to be difficult to match. The pressure oil pump is important for oil temperature, oil quality and viscosity and for pressure value in unit time. The parameter variable of each time of starting the pump is large, and the low-pressure starting valve pressure value cannot be changed and matched with the pump. The motor and the pressure oil pump are started with load, so that the motor is overheated and protected to frequently act, and more serious, the phenomena of shell rupture of the screw pump and the like occur. The reason for this is that a large load and inertia are imposed on the high-power screw pump and the motor, and therefore a certain time is required from the start to the steady state. If the load is applied before the screw pump reaches the rated flow, the screw pump and the system are both very unfavorable, and the service life of the screw pump is influenced, so that the service failure frequency of the power station oil pump is increased and damaged.
It can be seen that the improvement of the combined valve of the hydraulic pump outlet of the unit is a key for solving the technical problems.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide a unit oil pressing pump outlet combined valve and an oil pressing system.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the combined valve for the unit pressure oil pump outlet comprises a pressure oil inlet P, an oil outlet P1, an oil return port T, a main valve CV1, a check valve CV2, an electromagnetic bypass valve YV1 and a safety pilot valve YV2;
the first end of the main valve CV1 is connected with the first end of the safety pilot valve YV2, the main valve CV1 and the safety pilot valve YV2 form a safety valve, the second end of the safety pilot valve YV2 is connected with the first end of the electromagnetic bypass valve YV1, and the third end of the electromagnetic bypass valve YV1 is connected with the first end of the one-way valve CV2 and then is connected with the pressure oil inlet P; the second end of the YV1, the third end of the safety pilot valve YV2 and the second end of the main valve CV1 are connected with an oil return port T after being gathered; the second end of the check valve CV2 is connected with the oil outlet P1.
Further, the electromagnetic bypass valve YV1 adopts an electromagnetic bypass valve in a pilot control mode of an electromagnetic valve, and the switching of a valve core of the electromagnetic bypass valve YV1 is used for opening or closing the main valve CV1 to achieve the unloading and closing effects.
Furthermore, the safety valve is used for guaranteeing that the oil pressure in the pressure tank does not exceed an allowable value and a relief device which is arranged for safe operation of each link of the system, so as to prevent the overload of the oil pressure in the pressure oil pump and the pressure oil tank and protect the safety of the pressure oil pump and the pressure oil tank.
Furthermore, the main valve CV1 and the electromagnetic bypass valve YV1 form a low-pressure starting loop, and the low-pressure starting loop is used for unloading when the pressure oil pump is started, the pressure oil pump is gradually loaded within a certain time, and the pressure oil pump can only output pressure oil with rated working pressure and flow after the rotating speed of the motor reaches a certain value.
Further, the check valve CV2 is configured to effectively isolate the pressure oil tank from the pressure oil supply device under the action of isolation and unidirectional conduction, so that the pressure oil cannot flow back from the pressure oil tank.
The application also protects a unit oil pressing system, which comprises the unit oil pressing pump outlet combination valve, and further comprises a pressure oil tank 1, an automatic air supplementing device 2, a speed regulator oil return tank 3, a pressure oil pump 4, a motor 5, a control oil filter, an electrical control cabinet, a meter and a sensor 6; the electrical control cabinet is internally provided with a pressure oil pump PLC programmable control system which is used for automatic start and stop of the pressure oil pump and autorotation of the equipment; one end of a pressure oil inlet P of the unit pressure oil pump outlet combination valve is connected with an outlet of the pressure oil pump 4; one end of an oil outlet P1 of the unit pressure oil pump outlet combination valve is connected with an inlet of the pressure oil tank 1; one end of an oil return port T of the unit pressure oil pump outlet combination valve is communicated with the speed regulator oil return tank 3.
Furthermore, a delayer module is arranged in the PLC programmable control system, and the delay time is 2 seconds.
Compared with the prior art, the utility model has the following beneficial effects:
the combined valve for the unit pressure oil pump outlet solves the problem that the existing combined valve for the unit pressure oil system oil pump outlet is limited by spring performance, oil quality and oil temperature; the oil pump outlet combined valve does not have a fault during the test operation after the modification, and the oil pump outlet combined valve operates stably after the single machine is put into operation for a week; the pressure oil pump has good operation condition, and vibration, noise and temperature rise are all in good states; the motor has good running condition, and the current, the temperature rise and the vibration are all in good states; after improvement, each unit has no abnormal phenomenon, and the failure occurrence rate of the pressure oil pump outlet combination valve is zero. The method comprises the following steps: the electromagnetic bypass valve YV1 adopts an electromagnetic bypass valve controlled by an electromagnetic valve pilot, and the switching of a valve core of the electromagnetic bypass valve YV1 is used for opening or closing a main valve CV1 to achieve the unloading and closing effects; the safety valve consisting of the main valve CV1 and the safety pilot valve YV2 ensures that the oil pressure in the pressure tank does not exceed an allowable value and the relief device arranged for safe operation of each link of the system so as to prevent the overload of the oil pressure in the pressure oil pump and the pressure oil tank and protect the safety of the pressure oil pump and the pressure oil tank; the main valve CV1 and the electromagnetic bypass valve YV1 form a low-pressure starting loop, replace the original low-pressure starting valve and are used for unloading when the pressure oil pump is started, the pressure oil pump is gradually loaded in a certain time, and the pressure oil pump can only output the pressure oil with rated working pressure and flow after the rotating speed of the motor reaches a certain value; the check valve CV2 has the functions of isolation and unidirectional conduction, effectively isolates the pressure oil tank from the pressure oil supply equipment, and prevents the pressure oil from reversely flowing back from the pressure oil tank.
From the cost consideration, only the functional improvement of the pressure oil pump outlet combined valve is realized, the structure of the valve group is not changed, the connection control mode of the pressure oil system is not changed, the original combined valve low-pressure starting valve is adjusted to be in a closed state and does not participate in the low-pressure starting of the pressure oil pump, the original bypass unloading valve of the combined valve body is replaced by an electromagnetic bypass valve, the pressure oil pump starting program is modified, the pressure oil pump starting loading electromagnetic bypass valve is enabled to release pressure, the pressure oil pump is started to the rated rotation speed at low pressure, the electromagnetic bypass valve is in power failure, a pressure release loop is cut off, and the pressure oil pump is loaded and operated. The pressure oil system is provided with a time delay module, and the connection of other parts is not changed, so that the economic benefit is obvious.
Drawings
FIG. 1 is a schematic diagram of the principle and structure of a combination valve at the oil pump outlet of the unit of the utility model;
FIG. 2 is a schematic diagram of the overall structure of the hydraulic system of the present utility model;
FIG. 3 is a circuit diagram of a Programmable Logic Controller (PLC) of the hydraulic oil system of the present utility model;
fig. 4 is a ladder diagram of a PLC programmable control system for a hydraulic oil system according to the present utility model.
In the figure: p, a pressure oil inlet; p1, an oil outlet; t, an oil return port; CV1, a main valve; CV2, one-way valve; YV1, electromagnetic bypass valve; YV2, safety pilot valve; 1. a pressure oil tank; 2. an automatic air supplementing device; 3. the speed regulator returns to the oil tank; 4. a pressure oil pump; 5. a motor; 6. a sensor.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, the positional or positional relationship indicated by the terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Example 1
Referring to fig. 1, the combined valve for the hydraulic pump outlet of the machine set of the utility model comprises a pressure oil inlet P, an oil outlet P1, an oil return port T, a main valve CV1, a check valve CV2, an electromagnetic bypass valve YV1 and a safety pilot valve YV2; the first end of the main valve CV1 is connected with the first end of the safety pilot valve YV2, the main valve CV1 and the safety pilot valve YV2 form a safety valve, the second end of the safety pilot valve YV2 is connected with the first end of the electromagnetic bypass valve YV1, and the third end of the electromagnetic bypass valve YV1 is connected with the first end of the one-way valve CV2 and then is connected with the pressure oil inlet P; the second end of the YV1, the third end of the safety pilot valve YV2 and the second end of the main valve CV1 are connected with an oil return port T after being gathered; the second end of the check valve CV2 is connected with the oil outlet P1.
Preferably, the electromagnetic bypass valve YV1 adopts an electromagnetic bypass valve in a solenoid valve pilot control mode, and the switching of a valve core of the electromagnetic bypass valve YV1 is used for opening or closing the main valve CV1 to achieve the unloading and closing effects.
Optimally, the safety valve is used for guaranteeing that the oil pressure in the pressure tank does not exceed an allowable value and a relief device which is arranged for safe operation of each link of the system, so as to prevent the overload of the oil pressure in the pressure oil pump and the pressure oil tank and protect the safety of the pressure oil pump and the pressure oil tank.
Preferably, the main valve CV1 and the electromagnetic bypass valve YV1 form a low-pressure starting loop to replace the original low-pressure starting valve, and the low-pressure starting loop is used in an unloading state when the pressure oil pump is started, the pressure oil pump is gradually loaded within a certain time, and the pressure oil pump can only output pressure oil with rated working pressure and flow after the rotating speed of the motor reaches a certain value.
Optimally, the one-way valve CV2, because the pressure value of the pressure oil inlet P is smaller than the pressure value of the oil outlet P1 before the pressure oil pump is started, the one-way valve CV2 is in a closed state; after the pressure oil pump is started, the low-pressure starting valve is unloaded for 2 seconds, the pressure oil pump reaches the rated rotation speed, the low-pressure starting valve is closed, the main valve CV1 is closed, the pressure of the pressure oil inlet P rises, when the pressure of the pressure oil inlet P is larger than that of the oil outlet P1, the check valve CV2 overcomes the back pressure, and the check valve CV2 is opened to charge the pressure oil tank with oil; CV2 plays a role in isolation and unidirectional conduction in a pressure oil system, effectively isolates a pressure oil tank from pressure oil supply equipment, is a very important barrier, ensures that the pressure oil cannot flow back from the pressure oil tank, and ensures the safety and reliability of the system.
Example 2
Based on embodiment 1, as shown in fig. 1-4, the unit pressure oil system comprises the unit pressure oil pump outlet combined valve, and further comprises a pressure oil tank 1, an automatic air supplementing device 2, a speed regulator oil return tank 3, a pressure oil pump 4, a motor 5, a control oil filter, an electrical control cabinet, a meter and a sensor 6; the electrical control cabinet is internally provided with a pressure oil pump PLC programmable control system which is used for automatic start and stop of the pressure oil pump and autorotation of the equipment; one end of a pressure oil inlet P of the unit pressure oil pump outlet combination valve is connected with an outlet of the pressure oil pump 4; one end of an oil outlet P1 of the unit pressure oil pump outlet combination valve is connected with an inlet of the pressure oil tank 1; one end of an oil return port T of the unit pressure oil pump outlet combination valve is communicated with the speed regulator oil return tank 3.
The PLC programmable control system collects pressure and liquid level signals of the pressure oil tank, the program controls the pressure oil pump and an electric valve of the automatic air supplementing device, the liquid level and pressure of the pressure oil tank are maintained, and the control pressure and oil quantity of the unit speed regulator are ensured to meet the operation requirements; when the pressure oil pump is started, the electromagnetic bypass valve YV1 is electrified, so that the pressure oil pump is in an unloading state when the pressure oil pump is started, after the pressure oil pump reaches the rated rotation speed, the electromagnetic bypass valve YV1 is powered off, an unloading oil way of the electromagnetic bypass valve YV1 is closed, the pressure oil pump gradually loads, and pressure oil with rated working pressure and flow is output; the control mode of the two pressure oil pumps operated in the self-rotation mode is pressure control, when the pressure of the pressure oil tanks is reduced to a starting set value, the PLC programmable control system controls one pressure oil pump to start operation according to a logic program, and when the pressure value of the pressure oil tanks reaches a pump stopping set value, the pressure oil pump stops operation.
In order to realize that the electromagnetic bypass valve YV1 acts before the pressure oil pump is started, an unloading control oil way of the electromagnetic bypass valve is opened, a delayer module is added in a PLC programmable control system, when a pressure oil pump starting signal is obtained, the% I1.2 acts and is closed, the electromagnetic bypass valve YV1 is electrified, a valve core acts, an unloading control loop is opened, the% Q3.0 acts after the time delay of Shi Qiyan is 2 seconds, the pressure oil pump is started, when the pressure oil pump reaches a rated rotation speed, the% I1.6 acts and is disconnected, the electromagnetic bypass valve YV1 is powered off, the unloading control loop is closed, the pressure oil pump is loaded and operated, and the pressure oil with rated working pressure and flow is output; the pressure of the pressure oil inlet P of the combination valve is higher than the pressure of the oil outlet P1 of the combination valve, the valve core of the one-way valve CV2 acts and opens, the pressure oil is output from P to P1 to supply oil for the pressure oil tank, and the presence and the pressure of the pressure oil tank are ensured to be normal.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a unit pressure oil pump outlet combination valve which characterized in that: a pressure oil inlet (P), an oil outlet (P1), an oil return port (T), a main valve (CV 1), a one-way valve (CV 2), an electromagnetic bypass valve (YV 1) and a safety pilot valve (YV 2);
the first end of the main valve (CV 1) is connected with the first end of the safety pilot valve (YV 2), the main valve (CV 1) and the safety pilot valve (YV 2) form a safety valve, the second end of the safety pilot valve (YV 2) is connected with the first end of the electromagnetic bypass valve (YV 1), and the third end of the electromagnetic bypass valve (YV 1) is connected with the first end of the check valve (CV 2) and then is connected with the pressure oil inlet (P); the second end of the electromagnetic bypass valve (YV 1), the third end of the safety pilot valve (YV 2) and the second end of the main valve (CV 1) are connected with an oil return port (T) after being converged; the second end of the check valve (CV 2) is connected with the oil outlet (P1).
2. A unit pressure oil pump outlet combination valve according to claim 1, wherein: the electromagnetic bypass valve (YV 1) adopts an electromagnetic bypass valve in a solenoid valve pilot control mode, and the switching of a valve core of the electromagnetic bypass valve (YV 1) is used for opening or closing a main valve (CV 1) to achieve the unloading and closing effects.
3. A unit pressure oil pump outlet combination valve according to claim 1, wherein: the relief valve is used for guaranteeing that the oil pressure in the pressure tank does not exceed the allowable value and relief devices which are arranged for safe operation of all links of the system so as to prevent the overload of the oil pressure in the pressure oil pump and the pressure oil tank and protect the safety of the pressure oil pump and the pressure oil tank.
4. A unit pressure oil pump outlet combination valve according to claim 1, wherein: the main valve (CV 1) and the electromagnetic bypass valve (YV 1) form a low-pressure starting loop, and the low-pressure starting loop is used for unloading when the pressure oil pump is started, the pressure oil pump is gradually loaded within a certain time, and the pressure oil pump can only output pressure oil with rated working pressure and flow after the rotating speed of the motor reaches a certain value.
5. A unit pressure oil pump outlet combination valve according to claim 1, wherein: the one-way valve (CV 2) is used for effectively isolating the pressure oil tank from the pressure oil supply equipment under the action of isolation and one-way conduction, so that the pressure oil cannot flow back from the pressure oil tank.
6. A machine set pressure oil system, characterized in that: the combined valve comprises the unit pressure oil pump outlet combination valve according to any one of claims 1-5, and further comprises a pressure oil tank (1), an automatic air supplementing device (2), a speed regulator oil return tank (3), a pressure oil pump (4), a motor (5), a control oil filter, an electrical control cabinet, a meter and a sensor (6); the electrical control cabinet is internally provided with a pressure oil pump PLC programmable control system which is used for automatic start and stop of the pressure oil pump and autorotation of the equipment; one end of a pressure oil inlet (P) of the unit pressure oil pump outlet combination valve is connected with an outlet of the pressure oil pump (4); one end of an oil outlet (P1) of the unit pressure oil pump outlet combination valve is connected with an inlet of the pressure oil tank (1); one end of an oil return port (T) of the unit pressure oil pump outlet combination valve is communicated with the speed regulator oil return tank (3).
7. A machine set pressure oil system as claimed in claim 6, wherein: and a delayer module is arranged in the PLC programmable control system, and the delay time is 2 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321301662.3U CN220539996U (en) | 2023-05-26 | 2023-05-26 | Unit oil pressing pump outlet combined valve and oil pressing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321301662.3U CN220539996U (en) | 2023-05-26 | 2023-05-26 | Unit oil pressing pump outlet combined valve and oil pressing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220539996U true CN220539996U (en) | 2024-02-27 |
Family
ID=89968157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321301662.3U Active CN220539996U (en) | 2023-05-26 | 2023-05-26 | Unit oil pressing pump outlet combined valve and oil pressing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220539996U (en) |
-
2023
- 2023-05-26 CN CN202321301662.3U patent/CN220539996U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113482897B (en) | Oil pump control device and method for speed regulator hydraulic system of giant hydroelectric generating set | |
| CN105179335A (en) | Hydraulic steering engine control system | |
| CN109026688A (en) | A kind of large scale industry air compressor pressure adjusting optimizing redundancy system and method | |
| CN105650061A (en) | Hydraulic cylinder position following system with fault self-diagnosis function and control method | |
| CN210829922U (en) | Hydraulic turbine speed regulator and hydraulic integrated control system thereof | |
| CN220539996U (en) | Unit oil pressing pump outlet combined valve and oil pressing system | |
| CN110080934B (en) | Water turbine speed regulator with start-stop protection function | |
| CN109000027B (en) | Control method and control device for hydraulic control butterfly valve | |
| CN115013210B (en) | Explosion-proof diesel engine start control system | |
| CN210239900U (en) | Hydraulic turbine speed regulator with start-stop protection function | |
| CN216975110U (en) | Oil pump control system of speed regulator of water turbine | |
| CN214944453U (en) | Cooling water flow control system of gas turbine cooler | |
| CN103129919B (en) | Electro-hydraulic control system of disc type braking device of mine belt conveyor | |
| CN212005130U (en) | Pressure flow control device of phase modulation engine oil system | |
| JP2019065762A (en) | Hybrid servo system | |
| CN107420356A (en) | A kind of energy-saving hydraulic pumping plant for TRT fast cut valves | |
| CN214465192U (en) | Hydraulic system for guide vane of water turbine | |
| CN109236803B (en) | Hydraulic system with redundancy protection function | |
| CN216715820U (en) | High-speed heavy-duty pump prevents burning tile lubricating oil station | |
| CN219711945U (en) | Active stop protection device for hydraulic mechanical equipment | |
| CN221462663U (en) | Hydraulic control device capable of being used for motor protection | |
| CN218094561U (en) | Novel cartridge valve and cartridge valve type speed regulating system | |
| CN215762597U (en) | Control device for speed regulator hydraulic system of giant hydroelectric generating set | |
| CN214424806U (en) | Speed regulation control hydraulic system | |
| CN214064533U (en) | Trunnion lubricating oil system of steel ball coal mill |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |