CN213236267U - Automatic valve position maintaining control system for regulating valve - Google Patents
Automatic valve position maintaining control system for regulating valve Download PDFInfo
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- CN213236267U CN213236267U CN202021506022.2U CN202021506022U CN213236267U CN 213236267 U CN213236267 U CN 213236267U CN 202021506022 U CN202021506022 U CN 202021506022U CN 213236267 U CN213236267 U CN 213236267U
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Abstract
The utility model discloses an automatic control system for maintaining valve position of a regulating valve, which is applied to an important and sensitive regulating valve of a nuclear power station, wherein a valve body of the regulating valve is connected with an intelligent valve positioner, a cylinder of the regulating valve is connected with a gas outlet of a position-maintaining valve, a gas inlet of the position-maintaining valve is connected with a gas outlet of a flow amplifying module, a gas inlet of the flow amplifying module receives a gas source, a delivery outlet of the intelligent valve positioner is connected with a control end of the flow amplifying module, a gas source pressure end of the intelligent valve positioner receives the gas source, the control system also comprises a failure protection device, a signal input end of the failure protection device receives a control signal, a signal output end of the failure protection device is connected with a signal pressure end of the intelligent valve positioner, a gas source input end of the failure protection device receives the gas source, a gas source output end of the failure protection device is connected with a gas source control, the locking of the position-keeping valve is realized through the switching characteristic of the failure protection device so as to ensure that the regulating valve keeps the position, and the transient operation of the nuclear power station can be prevented from being influenced.
Description
Technical Field
The utility model relates to an instrument control technical field especially relates to an automatic control system that keeps in governing valve position.
Background
The valve positioner is a main accessory of the regulating valve and can receive the current signal to control the valve opening of the regulating valve. At present, the failure rate of the originally used valve positioner of the conventional island regulating valve of the nuclear power station is high, most functional positions are completely changed, but the novel valve positioner has no power-off position-maintaining function, and mature and reliable intelligent valve positioners in the current market have no functional design, and the valve positioner can generally influence the operation transient state of the nuclear power station after power-off, such as trip and reactor jump. The original valve positioner is still used for the position of the unit design which needs to have the power-off position-maintaining function, and the field device still has the fault conditions of surge, regulation fluctuation and the like.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in that, to prior art's defect, a governing valve position automatic hold control system is provided.
The utility model provides a technical scheme that its technical problem adopted is: the automatic valve position maintaining control system for the regulating valve comprises the regulating valve, wherein a valve body of the regulating valve is connected with an intelligent valve positioner; the cylinder of the regulating valve is connected with the air outlet of the position-keeping valve; the air inlet of the position-keeping valve is connected with the air outlet of the flow amplification module; an air inlet of the flow amplification module receives an air source; the output port of the intelligent valve positioner is connected with the control end of the flow amplification module; the air source pressure end of the intelligent valve positioner receives an air source; the intelligent valve positioner is characterized by further comprising a failure protection device, wherein the signal input end of the failure protection device receives a control signal, the signal output end of the failure protection device is connected with the signal pressure end of the intelligent valve positioner, the gas source input end of the failure protection device receives a gas source, and the gas source output end of the failure protection device is connected with the gas source control end of the position-keeping valve.
Further, the flow amplifying module comprises:
the air source is received to first flow amplifier, and its air inlet, its control end are connected the first or second delivery outlet of intelligent valve locator, its gas outlet connection the air inlet of position-keeping valve and pass through the gas outlet of position-keeping valve is connected the last cavity or the lower cavity of the cylinder of governing valve, just the governing valve is provided with the spring that makes diaphragm and valve rod reciprocate according to air source pressure.
Or, the flow amplifying module includes:
the first and second air inlets of the first and second flow amplifiers receive air sources, the first and second air outlets of the first and second flow amplifiers are respectively connected with the first and second air inlets of the position-keeping valve, and the first and second control ends of the first and second flow amplifiers are respectively connected with the first and second output ports of the intelligent valve positioner; and the first air outlet and the second air outlet of the position-keeping valve are respectively connected with the lower chamber and the upper chamber of the cylinder of the regulating valve.
Further, the control system also comprises an isolation valve which is arranged on a middle pipeline which enables the two pipelines between the position-keeping valve and the regulating valve to be communicated; when the isolating valve is opened, the gas in the upper chamber and the gas in the lower chamber of the cylinder of the regulating valve are communicated, so that the gas source in the cylinder of the regulating valve is quickly discharged through the first exhaust port and the second exhaust port of the first flow amplifier and the second flow amplifier.
Further, the failure protection device comprises a relay, a solenoid valve and a power supply; the first coil pin and the second coil pin of the relay are respectively a signal input end and a signal output end of the failure protection device; two pipelines connected with the air inlet and the air outlet of the electromagnetic valve are respectively an air source input end and an air source output end of the failure protection device; a pair of contacts of the relay is connected in series with the power supply and the control end of the electromagnetic valve to form an electromagnetic valve loop; the other pair of contacts of the relay is suspended.
Preferably, the electromagnetic valve is a two-position three-way normally open electromagnetic valve.
Furthermore, the system also comprises an air source distributor which is provided with an input end and a plurality of output ends and used for distributing an air source, wherein the input end of the air source distributor receives the air source, and three of the output ends of the air source distributor are respectively connected with the air source input end of the failure protection device, the air source pressure end of the intelligent valve positioner and the air inlet of the flow amplification module.
Further, the valve body of governing valve is connected with intelligent valve positioner includes: the valve rod of the regulating valve is connected with the feedback rod of the intelligent valve positioner; or the regulating valve is connected with the intelligent valve positioner in a non-contact manner through a mounting bracket of a magnetic strip.
Implement the utility model discloses an automatic control system that keeps in governing valve position has following beneficial effect: through the cascade connection of failure protection device and intelligent valve locator signal end, when intelligent valve locator loses the function of positioning the governing valve because of losing the electricity, failure protection device can produce the action and make the air supply of the control end of the valve of guarantor position valve discharge through failure protection device, thereby control the lockout of position valve, the air supply pressure in the cylinder that the valve of guarantor position valve shutting messenger governing valve maintains the current situation, thereby position when making the valve of governing valve keep losing the electricity, influence the nuclear power station operation transient state after preventing losing the electricity, such as trip machine, jump the heap, in addition, this system simple structure, be convenient for the field installation.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a first embodiment of an automatic regulating valve position maintaining control system according to the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the automatic regulating valve position maintaining control system of the present invention;
fig. 3 is a schematic structural diagram of a fail-safe device of the automatic holding control system for the valve position of the regulating valve according to the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of an automatic holding control system for a valve position of a regulating valve according to the present invention. The fail-safe device of the automatic regulating valve 10 valve position maintaining control system of the embodiment can lock the position maintaining valve 50 when the intelligent valve positioner 20 loses power, so as to control the position of the regulating valve 10 when the power is lost, and further effectively prevent the transient operation of the nuclear power plant from being affected.
In a first embodiment, as shown in fig. 1, the control system includes a regulating valve, a valve body 105 of the regulating valve 10 is connected to an intelligent valve positioner 20, a cylinder of the regulating valve is connected to an air outlet of a position-retaining valve 50, an air inlet of the position-retaining valve 50 is connected to an air outlet of a flow amplifying module 40, an air inlet of the flow amplifying module 40 receives an air source, an output port of the intelligent valve positioner 20 is connected to a control end of the flow amplifying module 40, an air source pressure end of the intelligent valve positioner 20 receives the air source, the system further includes a failsafe device 30, a signal input end of which receives a control signal, a signal output end of which is connected to the signal pressure end of the intelligent valve positioner 20, an air source input end of which receives the air source, and an air source output end of which is connected to an air source control end of the position. It should be noted that the flow amplifying module 40 includes one or two flow amplifiers, and the flow amplifier is one of the necessary air source processing elements in the industrial automation production.
In this embodiment, the failsafe device 30 mainly acts when power is lost, and controls the air source pressure at the air source control end of the position maintaining valve 50 to be reduced to a set value (the set value is determined by the internal structure of the position maintaining valve 50) or below so as to maintain the position of the position maintaining valve 50, thereby realizing that the position of the valve of the regulating valve 10 when power is lost, ensuring that the normal operation of the regulating valve 10 is not affected after the intelligent valve positioner 20 loses power, and preventing the nuclear power plant from being affected to shut down and jump the stack.
The principle that the intelligent valve positioner 20 outputs the corresponding air source pressure according to the control signal and the air source signal to control the valve opening of the regulating valve 10 is as follows: the Control signal is a current signal of 4 to 20mA, the failure protection device 30 receives the current signal and can be connected to the output end of a dcs (distributed Control system) logic controller through the signal input end thereof, the range of the current signal corresponds to 0 to 100% of the valve opening of the regulating valve 10, the signal pressure end i.s of the intelligent valve positioner 20 receives the current signal, the gas source pressure end A.S receives a gas source, and outputs corresponding gas source pressure to the Control end of the flow amplifying module 40 through the output port p.o.1 and/or p.o.2 thereof, so that the gas outlet of the flow amplifying module 40 outputs a gas source with the same pressure to the regulating valve 10, the upper chamber 102 and the lower chamber 101 of the cylinder of the regulating valve 10 are controlled by different gas sources of pressure to enable the diaphragm 103 to drive the valve rod 104 to move up and down, and the upper chamber 104 moves up and down, thereby realizing the regulation of the valve opening of the regulating valve rod 10.
The working principle of the flow amplifying module 40 is as follows: after the control end of the flow amplifying module 40 receives the air source with a certain pressure value output by the output port of the intelligent valve positioner 20, the control end can maintain the air source output pressure to be the same as the air source pressure output by the output port of the intelligent valve positioner 20 and amplify the flow of the air source at the same time, so as to quickly drive the downstream equipment (for example, to quickly adjust the valve of the regulating valve 10 to a certain opening degree).
It should be noted that the air source received by the air cylinder of the regulating valve 10 may increase or decrease the valve opening, and in the process of regulating the valve opening, since the air source is continuously input into the air cylinder, but the air source cannot be exhausted, so that the valve opening of the reverse regulating valve is difficult (if the air source input into the air cylinder is the increased valve opening, the reverse regulating refers to the decreased valve opening, and vice versa), therefore, the flow amplifying module 40 is further provided with an exhaust port (not shown in fig. 1) for exhausting the air source of the upper chamber 102 and/or the lower chamber 101 in the air cylinder of the regulating valve 10, and the air source of the upper chamber 102 and/or the lower chamber 101 in the air cylinder of the regulating valve 10 may be exhausted through the exhaust port, so that the regulating valve 10 decreases or.
The principle of the failsafe device 30 maintaining the position of the valve of the regulator valve 10 before the power loss after the power loss of the intelligent valve positioner 20 is as follows: the signal pressure end i.s of the intelligent valve positioner 20 is connected to the signal output end of the failsafe device 30, when the intelligent valve positioner 20 loses the control signal (i.e., loses power), the failsafe device 30 also loses the control signal, the failsafe device 30 that loses the control signal acts to disable itself from outputting the air source to the air source control end of the position-keeping valve 50, and at the same time, the air source at the air source control end of the position-keeping valve 50 is controlled to be exhausted through the exhaust port (not shown in fig. 1) of the failsafe device 30, the failsafe device 30 controls the air source pressure at the air source control end of the position-keeping valve 50 to be reduced to a set value or below, so that the position-keeping valve 50 is locked, and the regulating valve 10 is locked without air source input and output because the position-keeping valve 50 is locked, so that the air source pressure in the cylinder of the regulating valve 10 is maintained, and the valve position. Wherein the set value is determined by the structure of the hold valve 50.
The flow amplifying module 40 includes a first flow amplifier 401, an air inlet of which receives an air supply, a control end of which is connected to the first output port p.o.1 or the second output port p.o.2 of the intelligent valve positioner 20, an air outlet of which is connected to an air inlet of the position retaining valve 50 and to the upper chamber 102 or the lower chamber 101 of the air cylinder of the regulating valve 10 through an air outlet of the position retaining valve 50, and the regulating valve 10 is provided with a spring (not shown in fig. 1) which moves the diaphragm 103 and the valve rod 104 up and down according to the air supply pressure. In this embodiment, only one flow amplifier is used, and therefore, it is necessary to use the control valve 10 provided with a spring which moves upward or downward when the pressure in the cylinder is greater than the elastic force, and which moves upward or downward when the pressure of the air source in the cylinder is less than the elastic force.
In a first embodiment, as shown in fig. 3, fig. 3 is a schematic structural diagram of a fail-safe device of an automatic holding control system for regulating valve position according to the present invention, and preferably, the fail-safe device 30 specifically includes a relay 301, a solenoid valve 302 and a power source U. The first coil pin and the second coil pin of the relay 301 are respectively a signal input end and a signal output end of the failure protection device 30, two pipelines connected with the air inlet and the air outlet of the electromagnetic valve 302 are respectively an air source input end and an air source output end of the failure protection device 30, a pair of contacts of the relay 301 are connected in series with a power supply U and a control end of the electromagnetic valve 302 to form an electromagnetic valve loop, and the other pair of contacts of the relay 301 is suspended. When the intelligent valve positioner 20 loses power, the coil of the relay 301 loses power, the pair of contacts connected with the electromagnetic valve loop is closed to enable the electromagnetic valve loop to be conducted, the electromagnetic valve 302 in the electromagnetic valve loop is powered on and then the air inlet of the electromagnetic valve 302 is closed to enable an air source to be incapable of being output to the air source control end of the position protection valve 50, meanwhile, the air outlet (namely the air outlet of the failure protection device) and the air outlet of the electromagnetic valve 302 are conducted to exhaust the air source at the air source control end of the position protection valve 50, and when the pressure at the air source control end is smaller than or equal to a set value, the position protection valve 50 is locked, so that the position of the valve 10 is controlled to. Preferably, the solenoid valve 302 is a two-position three-way normally open solenoid valve, when the coil in the solenoid valve 302 is energized, the solenoid valve 302 is closed, otherwise, the solenoid valve is opened, when the solenoid valve 302 is closed, the air inlet of the solenoid valve 302 is closed, and the air outlet is communicated with the air outlet, and when the solenoid valve 302 is opened, the air outlet is closed, and the air inlet is communicated with the air outlet. This failure protection device 30 simple structure, the on-the-spot installation of being convenient for, make the latching valve 50 shutting when realizing intelligent valve positioner 20 loses the electricity through solenoid valve 302 and relay 301's switching characteristic to keep the valve position of governing valve 10, guarantee that intelligent valve positioner 20 can not influence the normal work of governing valve 10 after losing the electricity, influence the nuclear power station operation transient state after preventing losing the electricity.
Further, the control system further comprises an air source distributor 60 having an input end and a plurality of output ends for distributing an air source, wherein the input end receives the air source, and three of the output ends are respectively connected to the air source input end of the fail safe device 30, the air source pressure end of the intelligent valve positioner 20, and the air inlet of the flow amplifying module 40. By arranging the air source distributor 60, the laying number of air source pipelines can be reduced, and air supply centralized air supply management is facilitated.
In the present embodiment, the connection of the valve body 105 of the regulating valve 10 and the intelligent valve positioner 20 includes: the valve rod 104 of the regulating valve 10 is connected with the feedback rod of the intelligent valve positioner 20, or the regulating valve 10 is connected with the intelligent valve positioner 20 in a non-contact way through a mounting bracket of a magnetic strip. The position of the valve can be fed back more accurately through the feedback rod connection, and the friction loss can be avoided through the non-contact connection of the mounting bracket of the magnetic strip, so that the later maintenance cost is reduced.
Fig. 2 is a schematic structural diagram of a second embodiment of the automatic regulating valve position maintaining control system according to the present invention. The present embodiment differs from the first embodiment in that the flow amplifying module 40 employs two flow amplifiers, and in addition, an isolation valve 70 is provided between the regulating valve 10 and the holding valve 50.
In the second embodiment, specifically, as shown in fig. 2, the flow amplifying module 40 includes a first flow amplifier 401 and a second flow amplifier 402, the first and second air inlets of which receive the air source, the first and second air outlets of which are respectively connected to the first and second air inlets of the position-keeping valve 50, and the first and second control ends of which are respectively connected to the first and second output ports p.o.1 and p.o.2 of the intelligent valve positioner 20; the first and second outlets of the position-retaining valve 50 are connected to the lower chamber 101 and the upper chamber 102, respectively, of the cylinder of the regulating valve 10. By using two flow amplifiers, the first and second output ports p.o.1 and p.o.2 of the intelligent valve positioner 20 respectively output air sources of different pressures, the valve opening of the regulator valve 10 can be more accurately adjusted.
In the second embodiment, optionally, the control system further includes an isolation valve 70 provided on an intermediate line that communicates the two lines between the hold valve 50 and the regulator valve 10. When the isolation valve 70 is opened, the gas in the upper chamber 102 and the lower chamber 101 of the cylinder of the regulator valve 10 are communicated, so that the gas source in the cylinder of the regulator valve 10 is rapidly exhausted through the first and second exhaust ports (not shown in fig. 2) of the first flow amplifier 401 and the second flow amplifier 402. Because the upper chamber 102 and the lower chamber 101 in the cylinder have different pressures, after the air source of one chamber is exhausted, the other chamber is not exhausted, so that the time for exhausting the air source is prolonged, therefore, the isolating valve is manually opened when the air is required to be exhausted to balance the pressures of the two chambers, the quick exhaust of the air source is realized, the air exhaust time can be saved, and when the air is not required to be exhausted, the isolating valve 70 is in a closed state to ensure that the air source pressures of the two chambers of the regulating valve 10 are different.
The rest of the second embodiment is the same as the first embodiment, and is not repeated here.
In the above embodiment, with the signal series connection of intelligent line valve locator 20 and failure protection device 30, utilize the switching characteristic of relay 301, solenoid valve 302, protect position valve 50 etc, solved novel intelligent valve locator 20 and have not had the drawback of losing the electricity and protect the position function, can guarantee that novel intelligent valve locator 20 can not influence governing valve 10 normal work after losing the electricity, the valve of governing valve 10 can not protect the position to lead to influencing the application scenario that the nuclear power station operation transient state when losing the electricity and has great meaning.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (8)
1. An automatic maintaining control system for the valve position of a regulating valve comprises the regulating valve and is characterized in that,
the valve body (105) of the regulating valve (10) is connected with the intelligent valve positioner (20); the air cylinder of the regulating valve (10) is connected with the air outlet of the position retaining valve (50); the air inlet of the position retaining valve (50) is connected with the air outlet of the flow amplification module (40); the air inlet of the flow amplification module (40) receives an air source; the output port of the intelligent valve positioner (20) is connected with the control end of the flow amplification module (40); the air source pressure end of the intelligent valve positioner (20) receives an air source;
the intelligent valve positioner is characterized by further comprising a failure protection device (30), wherein the signal input end of the failure protection device receives a control signal, the signal output end of the failure protection device is connected with the signal pressure end of the intelligent valve positioner (20), the air source input end of the failure protection device receives an air source, and the air source output end of the failure protection device is connected with the air source control end of the position retaining valve (50).
2. The regulator valve position auto-hold control system of claim 1, wherein the flow amplification module (40) comprises:
the air inlet of the first flow amplifier (401) receives an air source, the control end of the first flow amplifier is connected with a first output port (P.O.1) or a second output port (P.O.2) of the intelligent valve positioner (20), the air outlet of the first flow amplifier is connected with the air inlet of the position protection valve (50) and is connected with an upper chamber (102) or a lower chamber (101) of the air cylinder of the regulating valve (10) through the air outlet of the position protection valve (50), and the regulating valve (10) is provided with a spring which enables the diaphragm (103) and the valve rod (104) to move up and down according to the pressure of the air source.
3. The regulator valve position auto-hold control system of claim 1, wherein the flow amplification module (40) comprises:
a first flow amplifier (401) and a second flow amplifier (402), wherein a first air inlet and a second air inlet of the first flow amplifier receive air sources, a first air outlet and a second air outlet of the first flow amplifier are respectively connected with a first air inlet and a second air inlet of the position retaining valve (50), and a first control end and a second control end of the first flow amplifier are respectively connected with a first output port (P.O.1) or a second output port (P.O.2) of the intelligent valve positioner (20); and a first air outlet and a second air outlet of the position-keeping valve (50) are respectively connected with a lower chamber (101) and an upper chamber (102) of an air cylinder of the regulating valve (10).
4. The automatic regulating valve position maintaining control system according to claim 3, characterized in that the control system further comprises an isolation valve (70) provided on an intermediate line communicating the two lines between the position maintaining valve (50) and the regulating valve (10);
when the isolation valve (70) is opened, the gas in the upper chamber (102) and the gas in the lower chamber (101) of the cylinder of the regulating valve (10) are communicated, so that the gas source in the cylinder of the regulating valve (10) is quickly discharged through the first exhaust port and the second exhaust port of the first flow amplifier (401) and the second flow amplifier (402).
5. The automatic holding control system of the position of the regulating valve according to any one of claims 2 to 4, characterized in that the fail safe means (30) comprises a relay (301), a solenoid valve (302) and a power source;
the first coil pin and the second coil pin of the relay (301) are respectively a signal input end and a signal output end of the failure protection device (30); two pipelines connected with the air inlet and the air outlet of the electromagnetic valve (302) are respectively an air source input end and an air source output end of the failure protection device (30); a pair of contacts of the relay (301) is connected in series with the power supply and the control end of the electromagnetic valve (302) to form an electromagnetic valve loop; the other pair of contacts of the relay (301) is floating.
6. The regulator valve position auto-hold control system of claim 5, wherein the solenoid valve (302) is a two-position, three-way, normally open solenoid valve.
7. The automatic regulating valve position maintaining control system according to claim 6, further comprising an air source distributor (60) having an input and a plurality of outputs for distributing an air source, the input of the air source distributor receiving the air source, three of the outputs of the air source distributor being connected to the air source input of the fail safe device (30), the air source pressure terminal of the intelligent valve positioner (20), and the air inlet of the flow amplifying module (40), respectively.
8. The regulator valve position auto-hold control system of claim 7, wherein the coupling of the valve body (105) of the regulator valve (10) to the intelligent valve positioner (20) comprises:
the valve rod (104) of the regulating valve (10) is connected with the feedback rod of the intelligent valve positioner (20); alternatively, the first and second electrodes may be,
the regulating valve (10) is connected with the intelligent valve positioner (20) in a non-contact mode through a mounting bracket of a magnetic strip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021506022.2U CN213236267U (en) | 2020-07-27 | 2020-07-27 | Automatic valve position maintaining control system for regulating valve |
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| CN202021506022.2U CN213236267U (en) | 2020-07-27 | 2020-07-27 | Automatic valve position maintaining control system for regulating valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932057A (en) * | 2021-11-23 | 2022-01-14 | 国家能源集团内蒙古电力有限公司 | Valve control system, method and device and electronic equipment |
| CN114526448A (en) * | 2022-01-12 | 2022-05-24 | 国家能源集团宁夏煤业有限责任公司 | Double-acting pneumatic regulating valve control system and petrochemical engineering conveying equipment |
-
2020
- 2020-07-27 CN CN202021506022.2U patent/CN213236267U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932057A (en) * | 2021-11-23 | 2022-01-14 | 国家能源集团内蒙古电力有限公司 | Valve control system, method and device and electronic equipment |
| CN113932057B (en) * | 2021-11-23 | 2024-03-29 | 国家能源集团内蒙古电力有限公司 | Valve control system, method and device and electronic equipment |
| CN114526448A (en) * | 2022-01-12 | 2022-05-24 | 国家能源集团宁夏煤业有限责任公司 | Double-acting pneumatic regulating valve control system and petrochemical engineering conveying equipment |
| CN114526448B (en) * | 2022-01-12 | 2024-04-05 | 国家能源集团宁夏煤业有限责任公司 | Double-acting pneumatic control valve control system and petrochemical conveying equipment |
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