Safety monitoring type stop valve for nuclear power station

Abstract

The invention discloses a safety monitoring type stop valve for a nuclear power station, and relates to the field of stop valves for nuclear power stations, the safety monitoring type stop valve comprises a stop valve body and a transverse guide groove, the outer end of the stop valve body is in butt joint with a reserved butt joint pipeline, and a nesting butt joint piece is mounted on the inner side of the transverse guide groove in a nesting manner; and the outer side of the nesting butt joint piece is fixedly connected with a first spring, the first spring is in butt joint with the inner wall of the reserved butt joint pipeline, the self-moving structure is provided with a first reserved air bag, and the first reserved air bag is connected to the interior of the reserved butt joint pipeline in an adhesive mode. According to the safety monitoring type stop valve for the nuclear power station, the connection range of a reserved butt joint pipeline is enlarged in a self-adaptive mode, and different pressures generated by a butt joint supply structure at the rear end of equipment are adjusted in a self-adaptive mode according to the liquid discharging process of different flows in different states; the switching-on range is adjusted in a self-adaptive mode according to the flow change of the contact liquid amount, safety monitoring work is carried out in a self-adaptive mode, and the situation that the liquid flow is too large is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant stop valves, in particular to a safety monitoring stop valve for nuclear power plants. Background Art

[0002] As a relatively important area, the nuclear power plant needs to be equipped with corresponding safety monitoring equipment. Among them, the stop valve is the control link of the pipeline in the nuclear power plant area, and its quality determines the overall safety quality; For example, a self-sealing stop valve with publication number CN109424756A includes a valve body, a valve disc, a valve stem, a valve cover, a bracket, and a handwheel; mainly, the inner hole wall at the lower end of the bracket and the outer cylindrical surface at the upper end of the valve body are connected by a plurality of mutually matching trapezoidal grooves; a middle cavity self-sealing device is arranged between the middle cavity of the valve body and the bracket, and the middle cavity self-sealing device is composed of a sealing gasket ring, a valve cover, and a stuffing sleeve. A U-shaped groove is formed at the lower end of the valve cover, and the outer circular wall of the U-shaped groove is elastically pressed against the inner circular wall of the sealing gasket ring and the conical chamfer of the middle cavity of the valve body, and the inner circular wall of the U-shaped groove is elastically pressed against the outer conical surface of the lower end of the stuffing sleeve, and a graphite packing is installed between the stuffing sleeve and the valve stem. It is suitable for high-temperature and high-pressure pipelines in thermal power plants, nuclear power plants, and petrochemical systems; Another example is the sodium stop valve with publication number CN110701310A, which is a valve with a cut-off function used in fast neutron breeder reactors. Specifically, it is a nuclear-grade electric bellows sodium stop valve, which consists of core components such as a valve body, a valve disc, a valve stem, a valve disc compression sleeve, a bellows, a valve cover, a heat sink, a packing compression sleeve, a packing pressure plate leak detection device, a preheating device, and an electrical device; the valve body adopts an integral forging structure to reduce welds or sealing joints, with reliable sealing, compact structure, and uniform wall thickness. During use, the valve has good fatigue resistance and strong deformation resistance; the valve is designed as a vertical heat sink structure, which not only improves the heat dissipation efficiency, but also enhances the overall rigidity of the valve and improves the seismic performance of the entire machine. A heating and temperature feedback device is designed on the valve body, which can reliably preheat the sodium stop valve to the required temperature to ensure the safe operation of the sodium stop valve, thereby ensuring the safe operation of the entire nuclear power plant; For example, a cable clamp with publication number CN103759021A, an electromagnetic stop valve for the top exhaust of a nuclear power plant, includes a main valve body assembly, an auxiliary valve body assembly, a valve cover, an electromagnetic drive mechanism and an electrical connector. The main valve body assembly includes a valve body, a valve cylinder and a valve sleeve assembly. The valve sleeve assembly includes a valve sleeve, a non-magnetic tube and a thermal insulation sleeve. The lower end of the non-magnetic tube is threadedly connected to the upper port of the valve sleeve, and the thermal insulation sleeve is fixedly arranged in the valve sleeve. The valve sleeve is fixedly connected to the upper end of the valve body. The sleeve is arranged in the valve body. The auxiliary valve body assembly is assembled by a valve head, a valve stem and a piston, and a guide body is arranged between the valve sleeve and the valve body. There are multiple heat sinks on the outer wall of the valve sleeve. There are multiple labyrinth grooves on the outer wall of the thermal insulation sleeve. The electromagnetic drive mechanism includes a moving iron core, a coil assembly, a coil outer shell and a static iron core. The solenoid valve must be able to withstand high temperature and high pressure pipeline medium conditions and high temperature, high heat, and high radiation environmental conditions, and it must be small in size and light in weight; Most of the above-mentioned existing technologies have improved their overall structure, while the existing safety monitoring stop valves for nuclear power plants are mostly unimpeded docking structures during operation. Since the pressures exerted on the supply structure docked at the rear end of the equipment during the discharge of liquids with different flow rates under normal conditions are different, it is impossible to adaptively adjust the connection range according to the flow change of the contact liquid amount, and thus there are certain limitations in use. Summary of the invention

[0003] The object of the present invention is to provide a safety monitoring stop valve for nuclear power plants to solve the problem proposed in the above background technology that most of them are unimpeded docking structures during operation, and because the pressures generated on the supply structure docked at the rear end of the equipment during the discharge of liquids with different flow rates under normal conditions are different, it is impossible to adaptively adjust the connection range according to the change in the flow rate of the contact liquid.

[0004] To achieve the above object, the present invention provides the following technical solution: a safety monitoring stop valve for a nuclear power plant, comprising a stop valve body, a reserved docking pipe and a transverse guide groove, wherein the outer end of the stop valve body is docked with a reserved docking pipe, and the inner wall of the reserved docking pipe is provided with a transverse guide groove; A nested docking piece is nested and installed on the inner side of the transverse guide groove, and a first spring is fixedly connected to the outer side of the nested docking piece, and the first spring is docked with the inner wall of the reserved docking pipe, and a nested fitting piston piece is docked at the lower end of the nested docking piece, and the nested fitting piston piece is nested and docked with the inner side of the reserved docking pipe, and a self-moving structure that can adapt to the docking state is provided on the inner side of the reserved docking pipe; A reserved cleaning structure is arranged on the inner side of the reserved docking pipe.

[0005] Furthermore, the self-movable structure is provided with a first reserved air bag, and the first reserved air bag is adhesively connected to the inside of the reserved docking pipe, and the position of the first reserved air bag and the nested fitting piston member correspond to each other; the inside of the reserved docking pipe is nested with a built-in reserved docking member, and the lower end of the built-in reserved docking member is fixedly connected to a second spring, and the second spring is fixedly connected to the inner side of the reserved docking pipe, the lower end of the built-in reserved docking member is docked with a reserved steel wire rope, and the reserved steel wire rope passes through the inner side of the reserved docking pipe, and the end of the reserved steel wire rope is docked with the outer side of the nested fitting piston member.

[0006] Furthermore, a second reserved airbag is adhesively connected to the inner upper end of the built-in reserved docking piece, and a reserved docking hose penetrates the outer side of the second reserved airbag, and the reserved docking hose penetrates along the inner side of the built-in reserved docking piece, and the end of the reserved docking hose is connected to the first reserved airbag; a sealing nested piece is nested on the inner side of the built-in reserved docking piece, and the lower end of the sealing nested piece is docked with the second reserved airbag, and a third spring is fixedly connected between the lower end of the sealing nested piece and the built-in reserved docking piece.

[0007] Furthermore, the nested docking piece forms a traction structure with the built-in reserved docking piece through the reserved steel wire rope, and the nested docking piece cooperates with the first spring on the outside to form a tensile elastic structure along the inside of the reserved docking pipe.

[0008] Furthermore, when the nested docking piece is pressed and moved inward, it cooperates with the nested fitting piston piece to synchronously apply pressure to the first reserved air bag in contact, and the first reserved air bag forms an air supply structure with the interior of the second reserved air bag through the reserved docking hose, and the inflated second reserved air bag pushes the sealed nested piece to move downward synchronously along the interior of the built-in reserved docking piece.

[0009] Furthermore, the reserved cleaning structure is provided with a resistance docking piece, and the resistance docking piece is fixedly docked at the lower end of the built-in reserved docking piece, the interior of the reserved docking pipe is provided with a built-in first liquid bag, and the inner side of the built-in first liquid bag is penetrated by a supply hose, and the supply hose is penetrated along the inner side of the reserved docking pipe.

[0010] Furthermore, the right inner wall of the reserved docking pipe is docked with a fitting protective layer, and a built-in second liquid bag is arranged at the lower end of the fitting protective layer, and the built-in second liquid bag is arranged on the inner side of the reserved docking pipe, and the built-in second liquid bag is connected to the supply hose, and the upper end of the built-in second liquid bag is fixedly connected with a reserved lifting piece.

[0011] Furthermore, during the downward movement of the built-in reserved docking piece, the built-in first liquid capsule in contact is pressurized synchronously by the abutting docking piece, and the built-in first liquid capsule is connected to the inner side of the built-in second liquid capsule through the supply hose.

[0012] Furthermore, during the expansion of the built-in second liquid bag, the reserved lifting member is pushed upward, and the elastic fitting protective layer in contact is lifted up reciprocally by the reserved lifting member.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The safety monitoring stop valve for nuclear power plants is provided with a self-moving structure. As the reserved docking pipe transmits water flow, the nested docking piece at the outer end will drive the nested fitting piston to move inward, thereby cooperating with the reserved steel wire rope at the lower end to stably drive the built-in reserved docking piece to open and close adaptively, thereby connecting the water flow, avoiding the long-term connection of the port part of the stop valve body under normal conditions, and preventing the blockage caused by excessive impurities mixed inside, thereby improving the practicality of the device; Furthermore, as the water flow rate increases, the nested docking piece will drive the nested fitting piston piece to move inward a greater distance and stretch the first spring to change its activity, thereby simultaneously applying pressure to the first reserved airbag in contact, so that it supplies air to the inside of the second reserved airbag through the reserved docking hose, and then the expanded second reserved airbag pushes the sealing nested piece to move downward along the inside of the built-in reserved docking piece, thereby adaptively expanding the connection range of the reserved docking pipeline, adaptively adjusting the different pressures generated by the supply structure of the rear end docking of the equipment according to the process of liquid discharge with different flow rates under different states, adaptively adjusting the connection range according to the change in the flow rate of the contacting liquid, and adaptively performing safety monitoring to prevent the liquid flow from being too large; Furthermore, a reserved cleaning structure is provided, and when the built-in reserved docking piece is pressed and moved downward, the resisting docking piece at its bottom will simultaneously apply pressure to the built-in first liquid capsule in contact, so that the built-in first liquid capsule can be supplied through the supply hose and the inner side of the built-in second liquid capsule, so that the built-in second liquid capsule can be expanded to push the reserved lifting piece upward to lift the elastic fitting protective layer in contact, and then the protective part inside the reserved docking pipe can be reciprocatedly vibrated to prevent impurities from sticking, thereby effectively ensuring its connection stability and improving the service life and automation level of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a partial three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 3 A schematic diagram of a half-cut three-dimensional structure of a butt joint pipeline is reserved for the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the nested docking piece of the present invention; Figure 5 For the present invention Figure 4A schematic diagram of the partially enlarged structure; Figure 6 This is a schematic diagram of the three-dimensional structure of the supply hose of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the sealing nesting member of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the built-in reserved docking piece of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the bonding protection layer of the present invention.

[0015] In the figure: 1. stop valve body; 2. reserved docking pipe; 3. transverse guide groove; 4. nested docking piece; 5. first spring; 6. nested fitting piston piece; 7. first reserved air bag; 8. second spring; 9. built-in reserved docking piece; 10. reserved wire rope; 11. reserved docking hose; 12. second reserved air bag; 13. sealing nested piece; 14. third spring; 15. abutting docking piece; 16. built-in first liquid bag; 17. supply hose; 18. built-in second liquid bag; 19. reserved lifting piece; 20. fitting protective layer. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1: Please refer to Figure 1-9 The present invention provides the following technical solutions: A safety monitoring stop valve for a nuclear power plant, comprising a stop valve body 1, a reserved docking pipe 2, a transverse guide groove 3, a nested docking piece 4, a first spring 5, a nested fitting piston piece 6, a first reserved airbag 7, a second spring 8, a built-in reserved docking piece 9, a reserved steel wire rope 10, a reserved docking hose 11, a second reserved airbag 12, a sealing nested piece 13, a third spring 14, a contact docking piece 15, a built-in first liquid capsule 16, a supply hose 17, a built-in second liquid capsule 18, a reserved lifting piece 19, and a fitting protective layer 20; The outer end of the stop valve body 1 is butt-jointed with a reserved butt-joint pipe 2, and the inner wall of the reserved butt-joint pipe 2 is provided with a transverse guide groove 3; A nested docking piece 4 is nested and installed on the inner side of the transverse guide groove 3, and a first spring 5 is fixedly connected to the outer side of the nested docking piece 4, and the first spring 5 is docked with the inner wall of the reserved docking pipe 2, and a nested fitting piston piece 6 is docked at the lower end of the nested docking piece 4, and the nested fitting piston piece 6 is nested and docked with the inner side of the reserved docking pipe 2, and a self-moving structure that adapts to the docking state is provided on the inner side of the reserved docking pipe 2; The self-movable structure is provided with a first reserved air bag 7, and the first reserved air bag 7 is adhesively connected to the inside of the reserved docking pipe 2, and the positions of the first reserved air bag 7 and the nested fitting piston member 6 correspond to each other; the inside of the reserved docking pipe 2 is nested with a built-in reserved docking member 9, and the lower end of the built-in reserved docking member 9 is fixedly connected to a second spring 8, and the second spring 8 is fixedly connected to the inner side of the reserved docking pipe 2, the lower end of the built-in reserved docking member 9 is docked with a reserved steel wire rope 10, and the reserved steel wire rope 10 passes through the inner side of the reserved docking pipe 2, and the end of the reserved steel wire rope 10 is docked with the outer side of the nested fitting piston member 6. The second reserved airbag 12 is adhesively connected to the inner upper end of the built-in reserved docking piece 9, and a reserved docking hose 11 penetrates the outer side of the second reserved airbag 12, and the reserved docking hose 11 penetrates along the inner side of the built-in reserved docking piece 9, and the end of the reserved docking hose 11 is connected to the first reserved airbag 7; a sealing nested piece 13 is nested on the inner side of the built-in reserved docking piece 9, and the lower end of the sealing nested piece 13 is docked with the second reserved airbag 12, and a third spring 14 is fixedly connected between the lower end of the sealing nested piece 13 and the built-in reserved docking piece 9.

[0018] The nested docking piece 4 forms a traction structure with the built-in reserved docking piece 9 through the reserved steel wire rope 10, and the nested docking piece 4 cooperates with the first spring 5 on the outside to form a tensile elastic structure along the inside of the reserved docking pipe 2. When the nested docking piece 4 moves inward under pressure, it cooperates with the nested fitting piston 6 to synchronously apply pressure to the first reserved airbag 7 in contact, and the first reserved airbag 7 forms an air supply structure with the inside of the second reserved airbag 12 through the reserved docking hose 11, and the expanded second reserved airbag 12 pushes the sealing nested piece 13 to move downward along the inside of the built-in reserved docking piece 9 synchronously. As the reserved docking pipe 2 transmits water flow, the nested docking piece 4 at its outer end will drive the nested fitting piston piece 6 to move inward, thereby cooperating with the reserved steel wire rope 10 at the lower end to stably drive the built-in reserved docking piece 9 to adaptively open and close, thereby connecting the water flow, avoiding the long-term connection of the port part of the stop valve body 1 under the normal state, and preventing the blockage caused by excessive impurities mixed inside. As the water flow increases, the nested docking piece 4 will drive the nested fitting piston piece 6 to move inward a greater distance and stretch the first spring 5 to change its activity, thereby synchronously pressurizing the first reserved airbag 7 in contact, so that It supplies air to the interior of the second reserved airbag 12 through the reserved docking hose 11, and then pushes the sealing nested part 13 to move downward along the interior of the built-in reserved docking part 9 through the expanded second reserved airbag 12, thereby adaptively expanding the connection range of the reserved docking pipeline 2, and adaptively adjusting the different pressures generated by the supply structure of the rear end docking of the equipment according to the process of liquid discharge with different flow rates in different states, adaptively adjusting the connection range according to the change in the flow rate of the contact liquid, and adaptively performing safety monitoring to prevent the liquid flow from being too large.

[0019] Embodiment 2: Based on Embodiment 1, a reserved cleaning structure is also disclosed, and its specific structure is as follows: A reserved cleaning structure is arranged on the inner side of the reserved docking pipe 2.

[0020] The reserved cleaning structure is provided with a resisting docking piece 15, and the resisting docking piece 15 is fixedly docked at the lower end of the built-in reserved docking piece 9. A built-in first liquid capsule 16 is provided inside the reserved docking pipe 2, and a supply hose 17 is passed through the inner side of the built-in first liquid capsule 16, and the supply hose 17 passes through the inner side of the reserved docking pipe 2. The right inner wall of the reserved docking pipe 2 is docked with a fitting protective layer 20, and a built-in second liquid capsule 18 is provided at the lower end of the fitting protective layer 20, and the built-in second liquid capsule 18 is provided on the inner side of the reserved docking pipe 2, and the built-in second liquid capsule 18 is connected to each other with the supply hose 17, and the upper end of the built-in second liquid capsule 18 is fixedly connected with a reserved lifting piece 19, and during the downward movement of the built-in reserved docking piece 9, the contacted built-in first liquid capsule 16 is simultaneously pressurized by the resisting docking piece 15, and the built-in first liquid capsule 16 is connected to the inner side of the built-in second liquid capsule 18 through the supply hose 17.

[0021] During the expansion of the built-in second liquid capsule 18, the reserved lifting piece 19 is pushed upward, and the contacting elastic fitting protective layer 20 is reciprocally lifted by the reserved lifting piece 19; during the downward movement of the built-in reserved docking piece 9 under pressure, the resisting docking piece 15 at its bottom will simultaneously apply pressure to the contacting built-in first liquid capsule 16, so that the built-in first liquid capsule 16 can supply the inner side of the built-in second liquid capsule 18 through the supply hose 17, so that the expanded state of the built-in second liquid capsule 18 pushes the reserved lifting piece 19 upward to reciprocately lift the contacting elastic fitting protective layer 20, and then the protective part inside the reserved docking pipe 2 is reciprocatingly vibrated to prevent impurities from sticking, effectively ensuring its connection stability.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety monitoring stop valve for a nuclear power plant, comprising a stop valve body (1), a reserved docking pipe (2) and a transverse guide groove (3), wherein the outer end of the stop valve body (1) is docked with the reserved docking pipe (2), and the inner wall of the reserved docking pipe (2) is provided with a transverse guide groove (3); Features: A nested docking piece (4) is nested and installed on the inner side of the transverse guide groove (3), and a first spring (5) is fixedly connected to the outer side of the nested docking piece (4), and the first spring (5) and the inner wall of the reserved docking pipe (2) are docked with each other, and a nested fitting piston piece (6) is docked at the lower end of the nested docking piece (4), and the nested fitting piston piece (6) is nested and docked with the inner side of the reserved docking pipe (2), and a self-moving structure that is adaptive to the docking state is provided on the inner side of the reserved docking pipe (2); A reserved cleaning structure is provided on the inner side of the reserved docking pipe (2).

2. A safety monitoring stop valve for a nuclear power plant according to claim 1, characterized in that: The self-movable structure is provided with a first reserved airbag (7), and the first reserved airbag (7) is bonded and connected to the inside of the reserved docking pipe (2), and the positions of the first reserved airbag (7) and the nested fitting piston member (6) correspond to each other; The reserved docking pipe (2) is nested with a built-in reserved docking piece (9), and the lower end of the built-in reserved docking piece (9) is fixedly connected to a second spring (8), and the second spring (8) is fixedly connected to the inner side of the reserved docking pipe (2), and the lower end of the built-in reserved docking piece (9) is docked with a reserved steel wire rope (10), and the reserved steel wire rope (10) passes through the inner side of the reserved docking pipe (2), and the end of the reserved steel wire rope (10) is docked with the outer side of the nested fitting piston member (6).

3. A safety monitoring stop valve for a nuclear power plant according to claim 2, characterized in that: The inner upper end of the built-in reserved docking piece (9) is bonded to a second reserved airbag (12), and a reserved docking hose (11) penetrates the outer side of the second reserved airbag (12), and the reserved docking hose (11) penetrates along the inner side of the built-in reserved docking piece (9), and the end of the reserved docking hose (11) is connected to the first reserved airbag (7); A sealing nesting piece (13) is nested inside the built-in reserved docking piece (9), and the lower end of the sealing nesting piece (13) is docked with the second reserved airbag (12), and a third spring (14) is fixedly connected between the lower end of the sealing nesting piece (13) and the built-in reserved docking piece (9).

4. A safety monitoring stop valve for a nuclear power plant according to claim 3, characterized in that: The nested docking piece (4) forms a traction structure with the built-in reserved docking piece (9) through the reserved steel wire rope (10), and the nested docking piece (4) cooperates with the first spring (5) on the outside to form a tensile elastic structure along the inside of the reserved docking pipe (2).

5. A safety monitoring stop valve for a nuclear power plant according to claim 4, characterized in that: When the nested docking piece (4) is pressed and moved inward, it cooperates with the nested fitting piston piece (6) to synchronously apply pressure to the first reserved airbag (7) in contact, and the first reserved airbag (7) forms an air supply structure with the interior of the second reserved airbag (12) through the reserved docking hose (11), and the expanded second reserved airbag (12) pushes the sealing nested piece (13) to move synchronously downward along the interior of the built-in reserved docking piece (9).

6. A safety monitoring stop valve for a nuclear power plant according to claim 3, characterized in that: The reserved cleaning structure is provided with a resisting docking piece (15), and the resisting docking piece (15) is fixedly docked at the lower end of the built-in reserved docking piece (9), the interior of the reserved docking pipe (2) is provided with a built-in first liquid capsule (16), and a supply hose (17) penetrates the inner side of the built-in first liquid capsule (16), and the supply hose (17) penetrates along the inner side of the reserved docking pipe (2).

7. A safety monitoring stop valve for a nuclear power plant according to claim 6, characterized in that: The right inner wall of the reserved docking pipe (2) is docked with a fitting protective layer (20), and a built-in second liquid capsule (18) is arranged at the lower end of the fitting protective layer (20), and the built-in second liquid capsule (18) is arranged on the inner side of the reserved docking pipe (2), and the built-in second liquid capsule (18) and the supply hose (17) are connected to each other, and the upper end of the built-in second liquid capsule (18) is fixedly connected with a reserved lifting piece (19).

8. A safety monitoring stop valve for a nuclear power plant according to claim 7, characterized in that: During the downward movement of the built-in reserved docking piece (9), the contacting built-in first liquid capsule (16) is simultaneously pressurized by the abutting docking piece (15), and the built-in first liquid capsule (16) is connected to the inner side of the built-in second liquid capsule (18) via the supply hose (17).

9. A safety monitoring stop valve for a nuclear power plant according to claim 8, characterized in that: During the expansion of the built-in second liquid capsule (18), the reserved lifting member (19) is pushed upward, and the elastically fitted protective layer (20) in contact is lifted and lifted reciprocally by the reserved lifting member (19).

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