Device and system for controlling pressure control valve

Abstract

The invention relates to an apparatus and a system for controlling a pressure control valve. The pressure control valve is arranged on a gas supply main pipe between a nuclear power conventional island and a gas supply source, the device comprises a pressure detection module, an electromagnetic valve and a remote control end in communication connection with the pressure detection module and the electromagnetic valve, the electromagnetic valve comprises a first valve port, a second valve port and a third valve port, the first valve port is used for being connected with the gas supply source, and the second valve port is used for being connected with the gas supply source. The second valve port is connected with a pressure control valve. And the pressure detection module is used for detecting the actual pressure value of the gas supply mother pipe and transmitting the actual pressure value to the remote control end. And the remote control end is used for controlling the electromagnetic valve to conduct the corresponding valve port according to the comparison result of the actual pressure value and the preset low-pressure alarm value so as to adjust the opening and closing of the pressure control valve by controlling the gas flow direction. Gas path control is optimized, a single fault point can be effectively eliminated, the structure is simple, and reliability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power circuit control, and in particular to a device and a system for controlling a pressure control valve. Background Art

[0002] In the conventional island SAR system of nuclear power plants (also known as the compressed air distribution system for instruments), the traditional pressure control valve uses a base-type regulator and a mechanical positioner to control the valve switch to achieve the on-off of the gas supply circuit. However, its structure is too complex, with many SPV (Single Point Vulnerability) points and difficult debugging. If a fault causes the valve to close, the conventional island SAR system will lose its gas supply and cannot be monitored or intervened in time, posing a risk of machine or reactor tripping. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a device and system for controlling a pressure control valve in view of the above-mentioned defects.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a device for controlling a pressure control valve, the pressure control valve is arranged on a gas supply mother pipe between a conventional nuclear power island and a gas supply source, the device comprises a pressure detection module, a solenoid valve, and a remote control end communicatively connected to the pressure detection module and the solenoid valve, the solenoid valve comprises a first valve port, a second valve port and a third valve port, the first valve port is used to connect to the gas supply source, and the second valve port is connected to the pressure control valve;

[0005] The pressure detection module is used to detect the actual pressure value of the gas supply main pipe and transmit it to the remote control end;

[0006] The remote control end is used to control the solenoid valve to open the corresponding valve port according to the comparison result between the actual pressure value and the preset low pressure alarm value, so as to adjust the opening and closing of the pressure control valve by controlling the gas flow direction.

[0007] Furthermore, in the device of the present invention, the remote control terminal is used for:

[0008] When it is determined that the actual pressure value is greater than the preset low pressure alarm value, the solenoid valve is controlled to open, and the gas from the gas supply source is delivered to the pressure control valve through the connected first valve port and the second valve port, and the pressure control valve is opened;

[0009] When it is determined that the actual pressure value is less than the preset low pressure alarm value, the solenoid valve is controlled to close, the gas in the cylinder of the pressure control valve is discharged through the connected second valve port and the third valve port, and the pressure control valve is closed.

[0010] Furthermore, in the device described in the present invention, the device further comprises a bypass electric valve provided on the gas supply main pipe and arranged in parallel with the pressure control valve;

[0011] The bypass electric valve is communicatively connected with the remote control end, and is used to receive an opening control signal sent by the remote control end when it determines that the pressure control valve is abnormally closed, so as to open the gas supply main pipe.

[0012] Further, in the device described in the present invention, the device also includes a fully open position travel switch connected to the pressure control valve;

[0013] The fully open position travel switch is also communicatively connected to the remote control end, and is used to monitor the actual valve position of the pressure control valve and transmit it to the remote control end.

[0014] Furthermore, in the device of the present invention, the remote control terminal is also used for:

[0015] When it is determined that the actual pressure value is greater than the preset low pressure alarm value, determining that the theoretical state of the pressure control valve is an open state;

[0016] When the actual state of the pressure control valve is determined to be a closed state according to the actual valve position, and the theoretical state is inconsistent with the actual state, it is determined that the pressure control valve is in an abnormally closed state.

[0017] Furthermore, in the device described in the present invention, the remote control terminal is also used to issue an alarm prompt for abnormal closing of the pressure control valve through a remote monitoring screen.

[0018] Further, in the device of the present invention, when it is determined that the pressure control valve is abnormally closed, the remote control end adopts an automatic control mode or a manual control mode, and the remote control end is used to:

[0019] Initiating the automatic control mode according to a first operation of the user, so as to automatically send the opening control signal to open the bypass electric valve; or

[0020] Starting the manual control mode according to a second operation of the user, so as to manually send the opening control signal to open the bypass electric valve;

[0021] The first operation is an operation of starting an automatic control mode, and the second operation is an operation of starting a manual control mode.

[0022] Furthermore, in the device described in the present invention, the remote control terminal is also used to display the monitored information through a remote monitoring screen.

[0023] Furthermore, in the device described in the present invention, the pressure detection module is a pressure transmitter; or

[0024] The device also includes a filter pressure reducing valve, an instrument valve, a first isolation valve and a second isolation valve. The first isolation valve is arranged on the gas supply main pipe between the pressure control valve and the gas supply source, and one end of the first isolation valve close to the gas supply source is also connected to one end of the second isolation valve, and the other end of the second isolation valve is connected to the pipeline between the filter pressure reducing valve and the instrument valve. One end of the filter pressure reducing valve is connected to the first valve port of the solenoid valve, the other end of the filter pressure reducing valve is connected to one end of the instrument valve, and the other end of the instrument valve is connected to the pressure detection module.

[0025] In addition, the present invention also provides a compressed air distribution system for instruments in a conventional island of a nuclear power plant, wherein the compressed air distribution system includes the device for controlling the pressure control valve as described above.

[0026] The device and system for controlling the pressure control valve of the present invention have the following beneficial effects: the device controls the opening and closing of the pressure control valve through the solenoid valve to realize the on-off of the gas supply pipeline, eliminates the base regulator and mechanical positioner of the pressure control valve, optimizes the gas circuit control, can effectively eliminate single failure points, and has a simple structure and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0028] Figure 1 is a schematic structural diagram of a device for controlling a pressure control valve provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of a device for controlling a pressure control valve provided by an embodiment of the present invention;

[0030] Figure 3 is a schematic structural diagram of a device for controlling a pressure control valve provided by an embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the control flow direction of the gas supply pipeline provided by an embodiment of the present invention;

[0032] Figure 5 It is a structural schematic diagram of a device for controlling a pressure control valve in the related art.

[0033] Description of Figure Numbers:

[0034] 10. Pressure control valve; 20. Solenoid valve; 30. Pressure detection module; 40. Remote control terminal; 50. Bypass electric valve; 60. Full-open stroke switch; 11. Filter pressure reducing valve; 22. Instrument valve; 33. First isolation valve; 44. Second isolation valve. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0036] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0038] refer to Figure 1In one of the embodiments provided by the present invention, the pressure control valve 10 is arranged on the gas supply mother pipe between the conventional island of nuclear power and the gas supply source, and is mainly used to control the gas delivered by the gas supply source to the conventional island of nuclear power downstream, so as to ensure the normal gas supply of the conventional island equipment. The device for controlling the pressure control valve 10 in this embodiment includes a pressure detection module 30, a solenoid valve 20, and a remote control terminal 40 connected to the pressure detection module 30 and the solenoid valve 20 in communication. The solenoid valve 20 includes a first valve port, a second valve port and a third valve port. The first valve port is used to connect the gas supply source, and the second valve port is connected to the pressure control valve 10. The pressure detection module 30 is used to detect the actual pressure value of the gas supply mother pipe and transmit it to the remote control terminal 40. The remote control terminal 40 is used to control the solenoid valve 20 to conduct the corresponding valve port according to the comparison result between the actual pressure value and the preset low pressure alarm value, so as to adjust the opening and closing of the pressure control valve 10 by controlling the gas flow direction. Optionally, the remote control terminal 40 can be a DCS remote monitoring platform, etc., and the following mainly takes the DCS remote monitoring platform as an example for detailed description. The pressure detection module 30 may be a pressure transmitter, and the working principle of the pressure transmitter may be specifically referred to the prior art, which will not be described in detail here. In this embodiment, the solenoid valve 20 may preferably be a normally closed solenoid valve.

[0039] It can be understood that the working principle of the present invention is: when the remote control end 40 determines that the actual pressure value is greater than the preset low pressure alarm value, the solenoid valve 20 is controlled to open, so that the gas of the gas supply source is delivered to the pressure control valve 10 through the connected first valve port and the second valve port, and the pressure control valve 10 is opened. When the remote control end 40 determines that the actual pressure value is less than the preset low pressure alarm value, the solenoid valve 20 is controlled to close, and the gas in the cylinder of the pressure control valve 10 is discharged through the connected second valve port and the third valve port, and the pressure control valve 10 is closed due to gas loss. In other words, when the actual pressure value of the gas supply mother pipe is greater than the low pressure alarm value, the solenoid valve 20 is electrically excited to open, and the first valve port and the second valve port are connected, and the ventilation output is output to the pressure control valve 10 to open it. When the actual pressure value of the gas supply mother pipe is less than the low pressure alarm value, the solenoid valve 20 loses power and magnetism and closes, and the second valve port and the third valve port are connected, exhausting gas to the outside, so that the pressure control valve 10 is closed due to gas loss, thereby ensuring the gas supply to the nuclear island.

[0040] This embodiment uses the solenoid valve 20 to control the opening and closing of the pressure control valve 10 to achieve the on-off of the gas supply pipeline, eliminates the base regulator and mechanical positioner of the pressure control valve 10, optimizes the gas circuit control, can effectively eliminate single failure points, and has a simple structure and high reliability.

[0041] In some embodiments, reference Figure 2The device of this embodiment further includes a bypass electric valve 50 which is arranged on the gas supply main pipe and is arranged in parallel with the pressure control valve 10. The bypass electric valve 50 is connected to the remote control end 40 for communication, and is used to receive an opening control signal sent by the remote control end 40 when it determines that the pressure control valve 10 is abnormally closed, so as to conduct the gas supply main pipe. It can be understood that the bypass electric valve 50 is connected in parallel with the pressure control valve 10 as a redundant solution for the pressure control valve 10, and is installed on the gas supply main pipe together.

[0042] In this embodiment, the control device optimizes the gas circuit control of the pressure control valve, cancels the base-type regulator and mechanical positioner of the pressure control valve, adopts a normally closed solenoid valve combined with remote monitoring to control the opening of the pressure control valve, and adds a bypass electric valve interlock to control the SAR system gas supply pipeline, which can ensure the gas source for downstream instruments. When the mother pipe pressure is not really low (that is, it is actually higher than the low pressure alarm value), if the pressure control valve of the gas supply mother pipe is abnormally closed at this time, the remote control end can interlock and control the opening of the bypass electric valve 50 to ensure the gas supply for the instruments of the downstream conventional island key equipment.

[0043] In some embodiments, reference Figure 3 The device of this embodiment further includes a fully open position travel switch 60 connected to the pressure control valve 10. The fully open position travel switch 60 is also communicatively connected to the remote control terminal 40 for monitoring the actual valve position of the pressure control valve 10 and transmitting it to the remote control terminal 40.

[0044] In this embodiment, the control device adds a fully open travel switch 60 for the pressure control valve 10, which can monitor the actual valve position of the pressure control valve 10 in real time, thereby monitoring the status of the pressure control valve 10, which is conducive to timely detection of abnormalities and immediate adoption of strategies to ensure the gas source for downstream instruments.

[0045] Specifically, when the remote control terminal 40 determines that the actual pressure value is greater than the preset low pressure alarm value, it determines that the theoretical state of the pressure control valve 10 is the open state.

[0046] When the actual state of the pressure control valve 10 is determined to be a closed state according to the actual valve position fed back by the fully open stroke switch 60, and when the theoretical state is inconsistent with the actual state, it is determined that the pressure control valve 10 is in an abnormally closed state.

[0047] Optionally, the remote control terminal 40 is provided with a remote monitoring screen, which can display the monitored information and can also give an alarm for abnormal closing of the pressure control valve 10. It can be understood that the monitored information includes the valve position of the pressure control valve 10, the valve position of the bypass electric valve 50, the pressure measurement point signal, etc.

[0048] In some embodiments, when it is determined that the pressure control valve 10 is abnormally closed, the remote control end 40 adopts the automatic control mode or the manual control mode. The remote control end 40 can start the automatic control mode according to the first operation of the user to automatically send an opening control signal to open the bypass electric valve 50. The remote control end 40 can also start the manual control mode according to the second operation of the user to manually send an opening control signal to open the bypass electric valve 50. It can be understood that the first operation is an operation to start the automatic control mode, and the second operation is an operation to start the manual control mode.

[0049] Specifically, when the remote control end 40 determines that the pressure control valve 10 is abnormally closed, it can receive the first operation of the user, and in response to the first operation, start the automatic control mode, automatically send an opening control signal to open the bypass electric valve 50. Alternatively, when the remote control end 40 determines that the pressure control valve 10 is abnormally closed, the user performs a second operation through the abnormal alarm prompt on the remote monitoring screen. The remote control end 40 receives the second operation of the user, and in response to the second operation, starts the manual control mode, sends an opening control signal through the user's manual operation to open the bypass electric valve 50, and closes the automatic control mode.

[0050] It can be understood that in this embodiment, the device automatically controls the on and off of the solenoid valve 20 and the bypass electric valve 50 according to the actual pressure value of the gas supply main pipe detected by the DCS logic. In the event of a failure in the automatic control linkage, the solenoid valve 20 and the bypass electric valve 50 are switched to manual control. The solenoid valve 20 and the bypass electric valve 50 of this embodiment are set with a manual-automatic switching mode, which can realize remote manual operation, and has a simple structure and high reliability.

[0051] Combination Figure 5 The pressure control valve 10 of the related art adopts a base-type regulator and a mechanical positioner. The base-type regulator adjusts the output to the mechanical positioner according to the pressure of the gas supply mother pipe to realize the opening of the pressure control valve 10. Due to the overly complex structure of the base-type regulator and the mechanical positioner, there are many SPV points and difficult debugging. If the valve is closed due to a fault, the conventional island SAR system will lose the gas supply, unable to monitor and intervene in time, and there is a risk of machine and reactor tripping.

[0052] like Figure 4As shown, the present invention adopts a normally closed solenoid valve 20 to control the opening and closing of the pressure control valve 10. When the pressure of the gas supply main pipe (MP value) is higher than the preset low pressure alarm value, the solenoid valve 20 is electrically excited to open, and the ventilation output to the pressure control valve 10 is opened. When the pressure of the gas supply main pipe is lower than the preset low pressure alarm value, the solenoid valve 20 loses power to exhaust and closes the pressure control valve 10 to ensure the gas supply to the nuclear island. In addition, the pressure control valve 10 adds a fully open stroke switch 60 for valve position monitoring and screen display, and a bypass electric valve 50 is set at the same time. When the main pipe pressure is not really low (higher than the preset low pressure alarm value), if the gas supply main pipe pressure control valve 10 is abnormally closed, the interlock control opens the bypass electric valve 50 to ensure the gas supply to the instrument of the downstream conventional island key equipment, and at the same time triggers the alarm monitoring valve position signal. The solenoid valve 20 and the electric bypass valve are also set with manual and automatic switching modes, and are remotely controlled.

[0053] The gas circuit control of the present invention adopts a relatively reliable solenoid valve 20 control, eliminates the single failure point of the pressure control valve 10, realizes the SAR gas supply pipeline status monitoring, and timely intervenes when the valve is abnormal. The structure is simple and reliable, and the electric bypass interlocking control is added to avoid the loss of downstream conventional island SAR gas supply caused by a single failure of the pressure control valve 10. It can effectively avoid the risk of low evaporator water level and stack jump accidents.

[0054] In some embodiments, Figure 4 As shown, the device of this embodiment also includes a filter pressure reducing valve 11, an instrument valve 22, a first isolation valve 33 and a second isolation valve 44. The first isolation valve 33 is arranged on the gas supply main pipe between the pressure control valve 10 and the gas supply source, and one end of the first isolation valve 33 close to the gas supply source is also connected to one end of the second isolation valve 44, and the other end of the second isolation valve 44 is connected to the pipeline between the filter pressure reducing valve 11 and the instrument valve 22, one end of the filter pressure reducing valve 11 is connected to the first valve port of the solenoid valve 20, the other end of the filter pressure reducing valve 11 is connected to one end of the instrument valve 22, and the other end of the instrument valve 22 is connected to the pressure detection module 30.

[0055] In another embodiment provided by the present invention, the compressed air distribution system for conventional island instruments in nuclear power plants of this embodiment includes the device for controlling the pressure control valve of the above embodiment.

[0056] This embodiment can eliminate the single failure point of the pressure control valve 10, realize the status monitoring of the SAR gas supply pipeline, and timely intervene when the valve abnormality is found. It can prevent the large and small adjustment valves of the downstream conventional island key equipment ARE from losing air and closing, avoid the risk of causing low evaporator water level and stack tripping accidents, realize online monitoring of the status of the conventional island SAR gas supply pipeline, and improve equipment reliability.

[0057] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0058] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0059] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A device for controlling a pressure control valve, characterized in that: The pressure control valve (10) is arranged on a gas supply main pipe between a conventional nuclear power island and a gas supply source, the device comprises a pressure detection module (30), a solenoid valve (20), and a remote control terminal (40) communicatively connected to the pressure detection module (30) and the solenoid valve (20), the solenoid valve (20) comprises a first valve port, a second valve port and a third valve port, the first valve port is used to connect to the gas supply source, and the second valve port is connected to the pressure control valve (10); The pressure detection module (30) is used to detect the actual pressure value of the gas supply mother pipe and transmit it to the remote control terminal (40); The remote control terminal (40) is used to control the electromagnetic valve (20) to open the corresponding valve port according to the comparison result between the actual pressure value and the preset low pressure alarm value, so as to adjust the opening and closing of the pressure control valve (10) by controlling the gas flow direction.

2. The device according to claim 1, characterized in that The remote control terminal (40) is used for: When it is determined that the actual pressure value is greater than the preset low pressure alarm value, the solenoid valve (20) is controlled to open, and the gas from the gas supply source is delivered to the pressure control valve (10) through the first valve port and the second valve port that are connected, and the pressure control valve (10) is opened; When it is determined that the actual pressure value is less than the preset low pressure alarm value, the solenoid valve (20) is controlled to be closed, the gas in the cylinder of the pressure control valve (10) is discharged through the second valve port and the third valve port that are connected, and the pressure control valve (10) is closed.

3. The device according to claim 1 or 2, characterized in that: The device further comprises a bypass electric valve (50) which is arranged on the gas supply main pipe and is arranged in parallel with the pressure control valve (10); The bypass electric valve (50) is communicatively connected to the remote control end (40) and is used to receive an opening control signal issued by the remote control end (40) when it is determined that the pressure control valve (10) is abnormally closed, so as to open the gas supply main pipe.

4. The device according to claim 3, characterized in that The device further comprises a fully open position travel switch (60) connected to the pressure control valve (10); The fully open position travel switch (60) is also communicatively connected to the remote control terminal (40) and is used to monitor the actual valve position of the pressure control valve (10) and transmit it to the remote control terminal (40).

5. The device according to claim 4, characterized in that The remote control terminal (40) is also used for: When it is determined that the actual pressure value is greater than the preset low pressure alarm value, determining that the theoretical state of the pressure control valve (10) is an open state; When the actual state of the pressure control valve (10) is determined to be a closed state according to the actual valve position, and the theoretical state is inconsistent with the actual state, it is determined that the pressure control valve (10) is in an abnormally closed state.

6. The device according to claim 5, characterized in that The remote control terminal (40) is also used to issue an alarm prompt for abnormal closing of the pressure control valve (10) through a remote monitoring screen.

7. The device according to claim 3, characterized in that When it is determined that the pressure control valve (10) is abnormally closed, the remote control terminal (40) adopts an automatic control mode or a manual control mode, and the remote control terminal (40) is used to: Starting the automatic control mode according to a first operation of the user, so as to automatically send the opening control signal to open the bypass electric valve (50); or Starting the manual control mode according to a second operation of the user, so as to manually send the opening control signal to open the bypass electric valve (50); The first operation is an operation of starting an automatic control mode, and the second operation is an operation of starting a manual control mode.

8. The device according to claim 1, characterized in that The remote control terminal (40) is also used to display the monitored information through a remote monitoring screen.

9. The device according to claim 1, characterized in that The pressure detection module (30) is a pressure transmitter; or The device further comprises a filter pressure reducing valve (11), an instrument valve (22), a first isolation valve (33) and a second isolation valve (44); the first isolation valve (33) is arranged on the gas supply main pipe between the pressure control valve (10) and the gas supply source, and one end of the first isolation valve (33) close to the gas supply source is also connected to one end of the second isolation valve (44); the other end of the second isolation valve (44) is connected to the pipeline between the filter pressure reducing valve (11) and the instrument valve (22); one end of the filter pressure reducing valve (11) is connected to the first valve port of the solenoid valve (20); the other end of the filter pressure reducing valve (11) is connected to one end of the instrument valve (22); and the other end of the instrument valve (22) is connected to the pressure detection module (30).

10. A compressed air distribution system for conventional nuclear power island instruments, characterized in that: The instrument compressed air distribution system comprises a device for controlling a pressure control valve as claimed in any one of claims 1 to 9.

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