CN206368769U - The controlling organization for preventing generating set water intake ball valve working seal from automatically exiting from - Google Patents
The controlling organization for preventing generating set water intake ball valve working seal from automatically exiting from Download PDFInfo
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- CN206368769U CN206368769U CN201621402025.5U CN201621402025U CN206368769U CN 206368769 U CN206368769 U CN 206368769U CN 201621402025 U CN201621402025 U CN 201621402025U CN 206368769 U CN206368769 U CN 206368769U
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- water intake
- working seal
- intake ball
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 230000008520 organization Effects 0.000 title claims abstract description 13
- 238000012423 maintenance Methods 0.000 claims abstract description 89
- 238000011144 upstream manufacturing Methods 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 description 16
- 238000007789 sealing Methods 0.000 description 13
- 230000005284 excitation Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
Classifications
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model is related to a kind of controlling organization for preventing generating set water intake ball valve working seal from automatically exiting from, including the main operation valve being connected with pressure stop valve and maintenance dense block valve closing, main operation valve and servomotor device, valve is closed to be connected, close valve and close valve through accident successively, mechanical signal valve of overrunning is connected with valve opening, valve opening is connected through working seal lock valve with maintenance dense block valve closing, the concora crush control valve being connected with bypass needle-valve is parallel between working seal lock valve and maintenance dense block valve closing, bypass needle-valve is arranged on bypass line, maintenance needle-valve is provided with bypass line, maintenance needle-valve is connected with opening controlling valve, the maintenance of water intake ball valve is sealedly connected with working seal control valve, working seal is connected with maintenance seal control valve, working seal control valve and maintenance seal control valve are connected with the work maintenance dense block valve closing controlled by servomotor device respectively.It may insure generating set and water intake ball valve system safe and reliable operation.
Description
Technical field
The utility model is related to a kind of controlling organization for preventing generating set water intake ball valve working seal from automatically exiting from.
Background technology
It is used on the ball valve on turbine-generator units and is provided with working seal and maintenance two parts of sealing, working seal
Ball valve body downstream side seal is referred to, maintenance sealing refers to ball valve body upstream side seal, and the two sealings have respectively
Two cavitys, referred to as put into chamber and exit chamber.When working seal is put into, input chamber leads to press water, exits the logical drainpipe of chamber and lets out
Pressure, operation sealing action input；When working seal is exited, input chamber leads to drainpipe pressure release, exits chamber and leads to press water, operates close
Envelope action is exited.And it is identical with the principle of working seal to overhaul sealed principle.
Turbine-generator units are when shutting down stable state, it is found that the ball valve working seal being arranged on water stream channel is exited, but
Logout is to look at, ball valve open command is not sent, the also closed positions of the work by-passing valve on water stream channel,
And the working seal lock valve on ball valve controlling organization is in and exits position really, very big leak can be heard at working seal
Sound, further checks that the pressure gauge for finding ball valve working seal lock valve input chamber is shown as 0.One kind is needed to prevent generating for this
The controlling organization that unit water intake ball valve working seal is automatically exited from.
The content of the invention
The purpose of this utility model is to provide a kind of control for preventing generating set water intake ball valve working seal from automatically exiting from
Mechanism processed, not only compact conformation, and working seal is effectively ensured no longer automatically exits from, it is ensured that generating set and water intake ball valve system
System safe and reliable operation.
The technical solution of the utility model is：A kind of control for preventing generating set water intake ball valve working seal from automatically exiting from
Mechanism processed, including the main operation valve and maintenance dense block valve closing being connected respectively with pressure stop valve, the main operation valve difference
With servomotor device and closing valve and being connected, the pass valve closes valve, mechanical signal valve of overrunning through accident successively and is connected with valve opening, institute
State valve opening through working seal lock valve with maintenance dense block valve closing to be connected, positioned at working seal lock valve and maintenance airtight lock
The concora crush control valve being connected with bypass needle-valve is parallel between valve, the bypass needle-valve is arranged at one end and is connected to water intake ball valve
The downstream and other end is connected on the bypass line of water intake ball valve upstream, also sets on bypass line close to water intake ball valve upstream side
It is equipped with maintenance needle-valve, the maintenance needle-valve and is connected in parallel on being used between working seal lock valve and maintenance dense block valve closing and controls
Bypass needle-valve is connected with the opening controlling valve of maintenance needle-valve, and the maintenance of the water intake ball valve is sealedly connected with for controlling work
The working seal control valve of dense block valve closing, the working seal of water intake ball valve is connected with the inspection for controlling maintenance dense block valve closing
Repair seal control valve, the work inspection of the working seal control valve and maintenance seal control valve respectively with being controlled by servomotor device
Dense block valve closing is repaiied to be connected；The work maintenance dense block valve closing, working seal control valve and maintenance seal control valve difference
It is connected by the road with drainpipe, work maintenance dense block valve closing is additionally provided with the pipeline being connected with maintenance needle-valve.
Further, one end of the pressure stop valve is connected with oil gear pressure oil tank, and pressure stop valve
The other end is connected with main operation valve and maintenance dense block valve closing respectively through oil filter.
Further, the main operation valve, close valve, accident close valve and mechanical signal overrun valve respectively with pressure apparatus oil return
Case is connected, and the overrun unlatching chamber of valve of the mechanical signal is connected with mechanical overdrive pressure oil tank.
Further, the work maintenance dense block valve closing is connected through water filter with the top of a desilting tank, described heavy
The bottom of husky tank is provided with the inlet pipeline being connected with the upstream of water intake ball valve,
Further, the closing chamber of the main operation valve is connected with pressure stop valve by the road, the unlatching of main operation hair
Chamber is connected with closing valve by the road.
Compared with prior art, the present invention has advantages below：Not only compact conformation, and working seal is effectively ensured
No longer automatically exit from, it is ensured that generating set and water intake ball valve system safe and reliable operation.Water intake ball valve can have when fully closed in time
Effect ground excludes leakage of oil, so that will not occur water intake ball valve working seal again automatically exits from phenomenon.The system of water intake ball valve control simultaneously
System is simplified, and the water intake ball valve open and close time shortens, and the unit change working time shortens, and unit can be made more quickly to ring
Answer power network demand, it is ensured that power network safety operation.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
For features described above of the present utility model and advantage can be become apparent, special embodiment below, and coordinate accompanying drawing,
It is described in detail below, but the utility model is not limited to this.
With reference to Fig. 1
A kind of controlling organization for preventing generating set water intake ball valve working seal from automatically exiting from, including respectively with pressure end
Main operation valve HV01 that valve SV09 is connected and maintenance dense block valve closing HV05, the main operation valve respectively with servomotor device 1
And pass valve SV03 is connected, the servomotor device is made up of two servomotors, and the pass valve closes valve SV01, machine through accident successively
The tool signal valve HV02 that overruns is connected with valve opening SV02, and the valve opening is through working seal lock valve HV04 and maintenance dense block valve closing
HV05 is connected, and is parallel between working seal lock valve and maintenance dense block valve closing and putting down that bypass needle-valve 2 is connected
Pressure control valve SV05, the bypass needle-valve is arranged at that one end is connected to water intake ball valve downstream and the other end is connected on water intake ball valve
On the bypass line 10 of trip, maintenance needle-valve 3, the maintenance needle-valve are additionally provided with close to water intake ball valve upstream side on bypass line
The unlatching of bypass needle-valve and maintenance needle-valve is controlled with being connected in parallel on being used between working seal lock valve and maintenance dense block valve closing
Control valve SV08 is connected, and the maintenance of the water intake ball valve is sealedly connected with the working seal for controlling working seal lock valve
Control valve SV04, the working seal of water intake ball valve is connected with the maintenance seal control valve for controlling maintenance dense block valve closing
The work maintenance dense block of V503, the working seal control valve and maintenance seal control valve respectively with being controlled by servomotor device
Valve closing HV07 is connected, and servomotor device is connected through off-tube road 11 with work maintenance dense block valve closing HV07 unlatching chamber；
The work maintenance dense block valve closing, working seal control valve and maintenance seal control valve are connected with drainpipe by the road respectively
Connect, work maintenance dense block valve closing is additionally provided with the pipeline being connected with maintenance needle-valve.Dense block valve closing is overhauled in the work
The two-position four way change valve that opening end is connected with the unlatching chamber of servomotor device by the road.
In the present embodiment, the main operation valve, close valve, accident and close valve, mechanical signal and overrun valve, valve opening and concora crush control valve
Respectively two-position four way change valve.The working seal lock valve, maintenance dense block valve closing are two-position two-way solenoid valve, the pressure
Power stop valve is bi-bit bi-pass reversal valve, and the maintenance seal control valve is two-position four-way hand-operated direction valve, the working seal
Control valve is the double electric reversal valves of two-position four-way, and the opening controlling valve is the double electric reversal valves of two-position four-way and opening controlling valve is parallel
The oil return opening of station leads to oil return box, and the oil inlet of the parallel station of opening controlling valve is connected with overhauling the unlatching chamber of needle-valve by the road
Connect.Machinery overruns signal valve for pilot valve.
In the present embodiment, one end of the pressure stop valve is connected with oil gear pressure oil tank 7, and by oil gear
Pressure oil tank drives, and the other end of pressure stop valve is connected with main operation valve and maintenance dense block valve closing respectively through oil filter 4.
The oil inlet of the main operation valve is connected with through oil filter 4 with pressure stop valve, the oil return opening and oil gear of main operation valve
Oil return box 5 is connected, and the A mouths of main operation valve are connected through normally open valve V6 with the unlatching chamber of servomotor device, the B mouths of main operation valve
It is connected through normally open valve V7 with the closing chamber of servomotor device, the unlatching chamber of main operation valve is connected with closing valve by the road, main behaviour
The also configured pipeline for having regulating valve of unlatching chamber for making valve is connected with its A mouthfuls, through normally open valve V5 on the pipeline with regulating valve
It is connected with pressure gauge P102, is connected on the pipeline with regulating valve with closing valve.The closing chamber of main operation valve is by the road with entering
Hydraulic fluid port is connected.
In the present embodiment, the oil inlet end and oil outlet end of the oil filter are correspondingly arranged on normally open valve V1 and V2, oil filter
Also pressure gauge P101 is connected with oil outlet end through normally open valve V3.
In the present embodiment, the main operation valve, close valve, accident and close valve and mechanical signal valve of overrunning and returned respectively with pressure apparatus
Fuel tank 5 is connected, and the overrun unlatching chamber of valve of the mechanical signal is connected with mechanical overdrive pressure oil tank, so as to driving machine
Tool signal is overrun valve.The oil-out of the concora crush control valve concora crush station is connected with oil return.
In the present embodiment, the delivery port and work maintenance dense block valve closing of the parallel station of the working seal control valve are parallel
The water return outlet of station is connected with drainpipe 8 by the road respectively, it is described maintenance seal control valve B mouthfuls of intersection station by the road with
Drainpipe is connected, and overhauls A mouthfuls of the intersection station of seal control valve through normally open valve V4 works parallel with work maintenance dense block valve closing
The delivery port of position is connected.
In the present embodiment, the water inlet of the parallel station of work maintenance dense block valve closing is configured normally open valve V8 pipe
Road is connected with water filter 12, and the water filter is connected through normally open valve V23 with the top of desilting tank 13, under the desilting tank
Portion is provided with the inlet pipeline being connected through normally open valve V9 with the upstream of water intake ball valve, and the bottom of desilting tank is additionally provided with normal
Valve closing V32 and the pipeline being connected with drainpipe.
In the present embodiment, the maintenance sealing downside of the water intake ball valve is additionally provided with through normally close valve V24, V25 and V26 and row
It is additionally provided with the downside of the pipeline that water pipe is connected, the working seal of water intake ball valve through normally close valve V27, V28, V29 and drainpipe phase
The pipeline of connection.
In the present embodiment, pressure difference relay 9 is additionally provided with the water intake ball valve, one end of the pressure difference relay is through tool
There is normally open valve V10 pipeline to be connected with the upstream of water intake ball valve, and normally open valve V13 is additionally provided with the one end, it is described normally opened
Valve V13 is connected with pressure gauge P1501；The other end of pressure difference relay passes through the pipeline with normally open valve V11 through water intake ball valve
Downstream is connected, and normally open valve V18 is also set up on the other end, and the normally open valve V18 is connected with pressure gauge P1502.
In the present embodiment, the closing chamber of the main operation valve by the road, oil filter be connected with pressure stop valve, main operation
The unlatching chamber of hair is connected with closing valve by the road.
In the present embodiment, the work maintenance dense block valve closing is arranged at normally open valve V8 with the pipeline that maintenance needle-valve is connected
On pipeline between water filter, and work maintenance dense block valve closing is provided with normally open valve with overhauling on the pipeline that needle-valve is connected
V22, oil-out of the closing chamber through oil pipe line station parallel with opening controlling valve of the maintenance needle-valve is connected.
In the present embodiment, sealedly input chamber is connected through normally open valve V19 and maintenance sealing control for the water intake ball valve maintenance
Valve is connected, and maintenance is sealedly released chamber and is connected through normally open valve V20 with maintenance seal control valve, water intake ball valve working seal
Input chamber is connected through normally open valve V12 with working seal control valve, and working seal exits chamber through normally open valve V21 and working seal
Control valve is connected（As shown in fig. 1）.
The a small amount of oil leak of piston of servomotor device is allowed and can not avoided, therefore must just adopt an effective measure and will connect
The pressure oil that power device device closes intracavitary leaks out to the oil exclusion in time for opening chamber through piston, it is to avoid oil pressure liter after long time integration
Height moves to left work maintenance sealing locking-valve HV07 valve elements, so as to avoid cutting off seal operation water, it is ensured that sealing is reliable for a long time
Input.
Ball valve is provided with pressure stop valve SV09, it is closed in compressor emergency shutdown stable state, and blocking oil circuit prevents ball
Valve malfunction, i.e., servomotor device opens the directly logical oil trap oil extraction of chamber when ball valve is fully closed, it is ensured that leakage of oil is discharged in time.
The operation principle of the controlling organization：
（One）Water intake ball valve opens control：
1）After monitoring system sends water intake ball valve open command, Opening pressure stop valve, pressure stop valve SV09 right sides
Obtain electrical excitation and open pressure stop valve, the pressure oil-source in oil gear pressure oil tank is connected with hydraulic system, and by flat
Pressure control valve SV05 obtains electrical excitation and walks to intersect station opening bypass needle-valve；
2）Opening controlling valve SV08 walks parallel station during normal startup-shutdown, and maintenance needle-valve and bypass needle-valve are in standard-sized sheet position
Put, only maintenance needle-valve is just closed in maintenance, concora crush is now carried out to the upstream and downstream of water intake ball valve by bypass line, when
After the concora crush of water intake ball valve upstream and downstream, by driving working seal control valve SV04 receding sides（Right side）Electrical excitation is obtained to walk to intersect work
Position, makes the chamber that exits of water intake ball valve working seal connect press water, the input chamber of working seal connects drainpipe；Due to providing pressure
The seal operation water of water is derived from the upstream of water intake ball valve, and the seal operation water from water intake ball valve upstream is through work maintenance dense block
Water intake ball valve exits working seal after valve closing HV07 parallel station；
3）During normal startup-shutdown, maintenance seal control valve V503 is walked to intersect station, and the maintenance sealing for entering water polo is in
Position is exited, work maintenance dense block valve closing HV07 opens chamber oil pressure through servomotor device and carries out locking, passes through servomotor device
The oil pressure for opening chamber carries out locking to work maintenance dense block valve closing HV07, prevents ball valve from sealing maloperation after opening；
4）After working seal lock valve HV04 exits locking station, valve opening SV02 is obtained electrical excitation and walk to intersect station, come
From unlatching station of the pressure oil through maintenance sealing locking-valve HV05 of hydraulic system（Left side valve element）, working seal locking-valve HV04
Unlatching station（Left side valve element）, machinery overruns signal valve HV02 parallel station（Left side valve element）, accident close the flat of valve SV01
Row station（Left side valve element）, close valve SV03 parallel station（Right side valve element）Main operation valve HV01 unlatching chamber is reached, is now led
Operation valve HV01 unlatching chamber and closing chamber leads to pressure oil, big due to opening chamber active area, makes main operation valve HV01 valve
Core, which is promoted, moves to left away parallel station, and the unlatching chamber of servomotor device leads to pressure oil, the logical oil return box of chamber closed, so as to open water inlet
Ball valve；
5）By making work overhaul dense block valve closing through locking pipeline 11 after the logical pressure oil of the unlatching chamber of servomotor device
HV07 walks to intersect station and completes locking work, makes the input chamber of water intake ball valve working seal and exits chamber, maintenance sealedly input
Chamber and exit chamber and lead to draining pressure release, prevent from sealing maloperation；
6）After water intake ball valve standard-sized sheet, make concora crush control SV05 dead electricity to walk parallel station and close bypass needle-valve, when bypass pin
After valve is fully closed, so far water intake ball valve is opened flow and is finished；
（Two）Water intake ball valve closing control：
1）After monitoring system, which sends ball valve closing, to be made, concora crush control valve SV05 is obtained electrical excitation and walk to intersect station opening side
Cleansing pin valve；
2）After bypass needle-valve standard-sized sheet, pass valve SV03 is obtained electrical excitation and walk to intersect station, main operation valve HV01 unlatching chamber
Oil return box is connected, because main operation valve HV01 closing chamber one leads directly to pressure oil, now main operation valve HV01 valve element is moved to right away
Intersect station, the unlatching chamber of servomotor device leads to oil extraction, closes the logical pressure oil closing water intake ball valve of chamber,
3）After water intake ball valve is fully closed, by working seal control valve SV04 put into side obtain electrical excitation walk parallel station make into
Water polo valve is devoted oneself to work sealing；
4）After the working seal input of water intake ball valve, concora crush control valve SV05 dead electricity is walked parallel station and close bypass pin
Valve；
5）After bypass needle-valve is fully closed, make to obtain electrical excitation on the left of pressure stop valve SV09, closing presure stop valve makes oil pressure
Pressure oil-source in device pressure oil tank is blocked with hydraulic system, and so far water intake ball valve closing flow path is finished.
The foregoing is only preferred embodiment of the present utility model, it is all according to present utility model application the scope of the claims done it is equal
Deng change and modification, it should all belong to covering scope of the present utility model.
Claims (5)
1. a kind of controlling organization for preventing generating set water intake ball valve working seal from automatically exiting from, including respectively with pressure stop valve
The main operation valve that is connected and maintenance dense block valve closing, it is characterised in that the main operation valve respectively with servomotor device and pass
Valve is connected, and the pass valve closes valve, mechanical signal valve of overrunning through accident successively and is connected with valve opening, and the valve opening is through working seal
Lock valve is connected with maintenance dense block valve closing, is parallel between working seal lock valve and maintenance dense block valve closing and side
The concora crush control valve that cleansing pin valve is connected, the bypass needle-valve is arranged at one end and is connected to water intake ball valve downstream and other end connection
On the bypass line of water intake ball valve upstream, maintenance needle-valve, institute are additionally provided with close to water intake ball valve upstream side on bypass line
Stating maintenance needle-valve and being connected in parallel between working seal lock valve and maintenance dense block valve closing is used for control bypass needle-valve and maintenance
The opening controlling valve of needle-valve is connected, and the maintenance of the water intake ball valve is sealedly connected with the work for controlling working seal lock valve
Make seal control valve, the working seal of water intake ball valve is connected with the maintenance seal control valve for controlling maintenance dense block valve closing,
The work maintenance dense block valve closing of the working seal control valve and maintenance seal control valve respectively with being controlled by servomotor device
It is connected；Work maintenance dense block valve closing, working seal control valve and maintenance seal control valve respectively by the road with draining
Pipe is connected, and work maintenance dense block valve closing is additionally provided with the pipeline being connected with maintenance needle-valve.
2. the controlling organization according to claim 1 for preventing generating set water intake ball valve working seal from automatically exiting from, it is special
Levy and be, one end of the pressure stop valve is connected with oil gear pressure oil tank, and pressure stop valve the other end through filter
Oily device is connected with main operation valve and maintenance dense block valve closing respectively.
3. the controlling organization according to claim 1 or 2 for preventing generating set water intake ball valve working seal from automatically exiting from, its
It is characterised by, the main operation valve, closes valve, accident and close valve and mechanical signal valve of overrunning and be connected respectively with pressure apparatus oil return box
Connect, the overrun unlatching chamber of valve of the mechanical signal is connected with mechanical overdrive pressure oil tank.
4. the controlling organization according to claim 3 for preventing generating set water intake ball valve working seal from automatically exiting from, it is special
Levy and be, the work maintenance dense block valve closing is connected through water filter with the top of a desilting tank, the bottom of the desilting tank
It is provided with the inlet pipeline being connected with the upstream of water intake ball valve.
5. the controlling organization that generating set water intake ball valve working seal is automatically exited from of preventing according to claim 1,2 or 4,
Characterized in that, the closing chamber of the main operation valve is connected with pressure stop valve by the road, the unlatching chamber of main operation hair is through pipe
Lu Yuguan valves are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621402025.5U CN206368769U (en) | 2016-12-20 | 2016-12-20 | The controlling organization for preventing generating set water intake ball valve working seal from automatically exiting from |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621402025.5U CN206368769U (en) | 2016-12-20 | 2016-12-20 | The controlling organization for preventing generating set water intake ball valve working seal from automatically exiting from |
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| Publication Number | Publication Date |
|---|---|
| CN206368769U true CN206368769U (en) | 2017-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621402025.5U Active CN206368769U (en) | 2016-12-20 | 2016-12-20 | The controlling organization for preventing generating set water intake ball valve working seal from automatically exiting from |
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| CN (1) | CN206368769U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401858A (en) * | 2016-12-20 | 2017-02-15 | 国家电网公司 | Control mechanism for preventing automatic exit of working seal of water inlet ball valve of generator set and use method of control mechanism |
-
2016
- 2016-12-20 CN CN201621402025.5U patent/CN206368769U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401858A (en) * | 2016-12-20 | 2017-02-15 | 国家电网公司 | Control mechanism for preventing automatic exit of working seal of water inlet ball valve of generator set and use method of control mechanism |
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