A high pressure differential drain stop valve for power stations

Abstract

The present invention relates to the field of stop valves, and in particular to a high-pressure differential drain stop valve for power stations, comprising: a valve body, a valve cover is fixedly connected to the top of the valve body through a flange, the left end of the valve body is a water inlet, and the right end is a water outlet; a valve seat, the valve seat is fixedly connected to the valve body to divide the inside of the valve body to form a water inlet chamber and a water outlet chamber, a first water drain port is provided at the top of the valve seat, and a second water drain port is provided on the left side wall of the valve seat; a storage box, the storage box is fixedly connected to the inner wall of the valve cover, and the storage box is used to extract the fluid medium in the water inlet chamber and inject the fluid medium into the water inlet chamber. The present invention provides a sealing door, a sealing block and a storage box, and adjusts the force of the fluid medium in the water inlet chamber on the first sealing component and the second sealing component through the storage box, which is beneficial to increasing the sealing performance of the valve on the one hand, and reducing the difficulty of opening the valve on the other hand.

Description

Technical Field

[0001] The invention relates to the field of stop valves, in particular to a high-pressure differential drain stop valve for power stations. Background Art

[0002] The stop valve mainly relies on the valve stem pressure to make the valve disc sealing surface and the valve seat sealing surface tightly combined to prevent the flow of medium. It has the characteristics of small friction between the sealing surfaces during the opening and closing process, wear resistance, small opening height, and good manufacturing process performance. It is the most widely used valve in the industrial sector and is usually used in power stations and liquefied natural gas receiving stations.

[0003] For example, the invention patent with the publication number CN118775550B discloses a stop valve, which belongs to the field of valve technology. The stop valve includes a valve body, a valve cover and a valve seat, wherein the valve seat is located in the valve body, a fixed flange is fixedly connected to the valve cover, a threaded rod is rotatably connected to the fixed flange, a threaded hole is provided on the surface of the valve body facing the fixed flange to be threadedly matched with the threaded rod, a connecting rod is fixedly connected to the surface of the valve body facing the fixed flange, a connecting groove is provided on the fixed flange to be plugged and matched with the connecting rod, and a limiting mechanism is provided on the fixed flange to limit the connecting rod in the connecting groove.

[0004] In the prior art, for high-pressure stop valves with a diameter greater than 100 mm, since the sealing performance of large-diameter valves is poor, the high-inlet and low-outlet method is usually adopted to improve the sealing performance of the valve. However, there are the following disadvantages: when opening the valve, it is necessary to overcome the pressure of the upper fluid, thereby increasing the difficulty of opening the valve.

[0005] To this end, the present invention proposes a high-pressure differential drain stop valve for power stations to solve the above problems. Summary of the invention

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: a high-pressure differential drain stop valve for power stations, comprising:

[0007] A valve body, the top of which is fixedly connected to a valve cover via a flange, the left end of the valve body being a water inlet, and the right end being a water outlet;

[0008] A valve seat, the valve seat is fixedly connected to the valve body to divide the interior of the valve body into a water inlet chamber and a water outlet chamber, a first water drain port is provided at the top of the valve seat, and a second water drain port is provided at the left side wall of the valve seat;

[0009] A first sealing component, the first sealing component is used to seal the first drain port;

[0010] a second sealing assembly, the second sealing assembly being used for sealing the second drain port;

[0011] A storage box, the storage box is fixedly connected to the inner wall of the valve cover, and the storage box is used to adjust the force of the fluid medium in the water inlet cavity on the first sealing assembly and the second sealing assembly;

[0012] Specifically, in the prior art, for high-pressure stop valves with a diameter greater than 100 mm, since the sealing performance of large-diameter valves is poor, the high-inlet and low-outlet method is usually used to improve the sealing performance of the valve, but there are the following disadvantages: when opening the valve, it is necessary to overcome the pressure of the upper fluid, thereby increasing the difficulty of opening the valve. The present technical solution can solve the above problems, and the specific operation is as follows: when it is necessary to close the valve, first seal the second drain port through the second sealing component, close the water inlet, so that the fluid medium stops injecting into the water inlet chamber, and then seal the first drain port through the first sealing component. Since the fluid medium stops injecting into the water inlet chamber at this time, it is helpful to reduce the resistance of the first sealing component to seal the first drain port, and in the process of the first sealing component sealing the first drain port, the fluid medium in the water inlet chamber will flow out through the first drain port and enter the drainage chamber until the first sealing component seals the first drain port. At this time, the water inlet chamber is not filled with the fluid medium;

[0013] After the first sealing assembly seals the first drain port, the same fluid medium is injected into the water inlet cavity through the storage box, so that the water inlet cavity is filled with the fluid medium, so as to increase the force acting on the first sealing assembly and the second sealing assembly, thereby facilitating the improvement of the sealing of the first drain port and the second drain port;

[0014] When the valve body needs to be opened, the fluid medium in the water inlet cavity is first extracted through the storage box to reduce the fluid medium in the water inlet cavity, thereby reducing the resistance of the fluid medium to the first sealing component and the second sealing component, which is conducive to reducing the difficulty of opening the valve;

[0015] Then open the first drain port to connect the water inlet cavity and the water discharge cavity in advance, and finally open the second drain port to allow the water to flow into the water inlet cavity through the second drain port, and then into the water discharge cavity through the first drain port.

[0016] Preferably, the first sealing assembly comprises:

[0017] A sealing sleeve, wherein the sealing sleeve passes through the bottom end of the storage box and is fixedly connected to the storage box, and the top end of the sealing sleeve passes through the top of the valve cover;

[0018] A threaded sleeve, wherein the bottom end of the threaded sleeve is fixedly connected to the top end of the sealing sleeve, and the inner thread of the threaded sleeve is connected with a screw;

[0019] A rotating rod, wherein the rotating rod is slidably connected in the sealing sleeve, the top end of the rotating rod is slidably inserted in the bottom end of the screw rod, the bottom end of the rotating rod is rotatably connected with a sealing block, and the sealing block is located directly above the first drain port;

[0020] A hand wheel is fixedly connected to the top end of the screw rod.

[0021] Preferably, the second sealing assembly comprises:

[0022] A sealing door, wherein the sealing door is slidably connected to the left side wall of the valve seat;

[0023] Two connecting frames, one end of the two connecting frames is fixedly connected to the sealing block, and the other end is slidably connected to the side wall of the sealing door, and a first spring is connected between the connecting frame and the sealing door.

[0024] Preferably, it also includes:

[0025] A piston assembly, wherein the piston assembly is slidably connected in a storage box, an arc-shaped slide groove is provided in the storage box, and a first connecting pin is fixedly connected to an outer wall of the piston assembly, and the first connecting pin is slidably connected in the arc-shaped slide groove;

[0026] A pipeline, the top end of which is fixedly connected to the bottom end of the storage box, and the bottom end of which extends above the top end of the valve seat;

[0027] A rotation drive assembly is used to drive the piston assembly to rotate.

[0028] Preferably, the rotary drive assembly comprises:

[0029] Two telescopic rods, the bottom ends of the telescopic ends of the two telescopic rods are fixedly connected to the top of the piston assembly, the top ends of the two telescopic rods are fixedly connected to a driving disk, and the driving disk is rotatably connected to the outer wall of the threaded sleeve;

[0030] Two driving chutes, the two driving chutes are symmetrically arranged at the top of the driving disk, one end of the driving chutes is close to the center of the driving disk, and the other end is far from the center of the driving disk;

[0031] Two L-shaped drive frames, the two L-shaped drive frames are symmetrically slidably connected to the top of the valve cover, the top of the L-shaped drive frame is fixedly connected to a second connecting pin, and the second connecting pin is slidably connected in the driving slide groove;

[0032] A pushing component is used to push the L-shaped driving frame.

[0033] Preferably, the pushing assembly comprises:

[0034] A driving groove, which is provided on the outer side wall of the L-shaped driving frame and has a straight groove and an oblique groove;

[0035] A driving rod, the top end of which is rotatably connected to the outer side wall of the hand wheel, the bottom end of which is fixedly connected to a third connecting pin, and the third connecting pin is slidably connected in the driving groove.

[0036] Preferably, the piston assembly comprises:

[0037] A sliding shell, the sliding shell is slidably connected in the storage box, the first connecting pin is fixedly connected to the outer wall of the sliding shell, the bottom end of the telescopic rod is fixedly connected to the top end of the sliding shell, the bottom end of the sliding shell is slidably connected with a compression block, and a second spring is fixedly connected between the compression block and the sliding shell.

[0038] Preferably, an air pressure sensor is provided in the sliding shell, and the air pressure sensor is used to detect the air pressure change in the sliding shell.

[0039] Preferably, it also includes:

[0040] A rotating ring is rotatably connected to the valve cover and the sealing sleeve respectively, and the rotating ring is fixedly connected to the two telescopic rods.

[0041] Preferably, a sealing plug is fixedly connected to the bottom end of the sealing block.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The present invention provides a sealing door, a sealing block and a storage box. After the first sealing component seals the first drain port, the same fluid medium is injected into the water inlet cavity through the storage box, so that the water inlet cavity is filled with the fluid medium, so as to increase the force acting on the first sealing component and the second sealing component, thereby facilitating the improvement of the sealing of the first drain port and the second drain port. When it is necessary to open the valve, the fluid medium in the water inlet cavity is first extracted through the storage box to reduce the fluid medium in the water inlet cavity, thereby reducing the resistance of the fluid medium to the first sealing component and the second sealing component, which is conducive to reducing the difficulty of opening the valve.

[0044] 2. The present invention arranges a sliding shell and a compression block. When the sliding shell drives the compression block to move downward, as the fluid medium in the water inlet chamber is filled, the compression block moves upward along the sliding shell, and the second spring generates elastic force, which is beneficial to increase the water pressure in the water inlet chamber, and then increase the force on the sealing door and the sealing block, thereby improving the sealing of the valve body.

[0045] 3. The present invention detects the change of air pressure in the sliding shell by setting an air pressure sensor. If the first drain port leaks, the water pressure in the water inlet chamber will be reduced. Subsequently, under the action of the second spring, the compression block moves downward to compress the fluid medium in the storage box and make it enter the water inlet chamber. The downward movement of the compression block will reduce the air pressure in the sliding shell, so that it can be judged whether the valve body is leaking according to the change of air pressure in the sliding shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0047] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0048] Figure 3 The valve body of the present invention is cut away Figure 1 ;

[0049] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0050] Figure 5 The valve body of the present invention is a cross-sectional view Figure 2 ;

[0051] Figure 6 It is a schematic diagram of the connection between the driving rod and the L-shaped driving frame in the present invention.

[0052] In the figure: valve body 1, water inlet 101, water outlet 102, water inlet chamber 103, drainage chamber 104, valve cover 2, valve seat 3, first drain port 301, second drain port 302, storage box 4, arc chute 401, pipeline 5, sliding shell 6, first connecting pin 7, compression block 8, second spring 9, third connecting pin 10, air pressure sensor 11, sealing sleeve 12, threaded sleeve 13, screw 14, rotating rod 15, sealing block 16, sealing plug 17, hand wheel 18, sealing door 19, connecting frame 20, first spring 21, telescopic rod 22, rotating ring 23, driving disk 24, driving chute 25, L-shaped driving frame 26, second connecting pin 27, driving groove 28, driving rod 29. DETAILED DESCRIPTION

[0053] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0054] like Figures 1 to 6 A high-pressure differential drain stop valve for a power station is shown, comprising:

[0055] A valve body 1, the top of which is fixedly connected to a valve cover 2 via a flange, the left end of the valve body 1 being a water inlet 101, and the right end being a water outlet 102;

[0056] The valve seat 3 is fixedly connected to the valve body 1 to divide the interior of the valve body 1 into a water inlet chamber 103 and a water outlet chamber 104. A first water drain port 301 is provided at the top of the valve seat 3, and a second water drain port 302 is provided at the left side wall of the valve seat 3;

[0057] A first sealing component, the first sealing component is used to seal the first drain port 301;

[0058] The second sealing component is used to seal the second drain port 302 .

[0059] A storage box 4, which is fixedly connected to the inner wall of the valve cover 2, and is used to adjust the force of the fluid medium in the water inlet cavity 103 on the first sealing assembly and the second sealing assembly;

[0060] Specifically, in the prior art, for high-pressure stop valves with a diameter greater than 100 mm, since the sealing performance of large-diameter valves is poor, the high-inlet and low-outlet method is usually used to improve the sealing performance of the valve. However, when opening the valve, it is necessary to overcome the pressure of the upper fluid, thereby increasing the difficulty of opening the valve. The present technical solution can solve the above problems, and the specific operation is as follows: when it is necessary to close the valve, first seal the second drain port 302 through the second sealing component, close the water inlet 101, so that the fluid medium stops being injected into the water inlet chamber 103, and then seal the first drain port 301 through the first sealing component. Since the fluid medium stops being injected into the water inlet chamber 103 at this time, it is helpful to reduce the resistance of the first sealing component to seal the first drain port 301, and in the process of the first sealing component sealing the first drain port 301, the fluid medium in the water inlet chamber 103 will flow out through the first drain port 301 and enter the drainage chamber 104 until the first sealing component seals the first drain port 301. At this time, the water inlet chamber 103 is not filled with the fluid medium;

[0061] After the first sealing assembly seals the first drain port 301, the same fluid medium is injected into the water inlet cavity 103 through the storage box 4, so that the water inlet cavity 103 is filled with the fluid medium to increase the force acting on the first sealing assembly and the second sealing assembly, thereby facilitating the improvement of the sealing of the first drain port 301 and the second drain port 302;

[0062] When the valve needs to be opened, the fluid medium in the water inlet chamber 103 is first extracted through the storage box 4 to reduce the fluid medium in the water inlet chamber 103, thereby reducing the resistance of the fluid medium to the first sealing component and the second sealing component, which is conducive to reducing the difficulty of opening the valve;

[0063] Then, the first drain port 301 is opened to connect the water inlet chamber 103 and the water discharge chamber 104 in advance, and finally, the second drain port 302 is opened to allow the fluid medium to enter the water inlet chamber 103 through the second drain port 302 and then enter the water discharge chamber 104 through the first drain port 301.

[0064] It should be noted that the volume of the storage box 4 is greater than the volume of the water inlet chamber 103 .

[0065] As a further embodiment of the present invention, the first sealing component comprises:

[0066] A sealing sleeve 12, which passes through the bottom end of the storage box 4 and is fixedly connected to the storage box 4, and a top end of the sealing sleeve 12 passes through the top of the valve cover 2;

[0067] A threaded sleeve 13, the bottom end of which is fixedly connected to the top end of the sealing sleeve 12, and the inner thread of the threaded sleeve 13 is connected with a screw 14;

[0068] A rotating rod 15, the rotating rod 15 is slidably connected in the sealing sleeve 12, the top end of the rotating rod 15 is slidably inserted in the bottom end of the screw rod 14, and the bottom end of the rotating rod 15 is rotatably connected to a sealing block 16, and the sealing block 16 is located directly above the first drain port 301;

[0069] A hand wheel 18, the hand wheel 18 is fixedly connected to the top end of the screw rod 14;

[0070] The second sealing assembly comprises:

[0071] A sealing door 19, the sealing door 19 is slidably connected to the left side wall of the valve seat 3;

[0072] Two connecting frames 20, one end of the two connecting frames 20 is fixedly connected to the sealing block 16, and the other end is slidably connected to the side wall of the sealing door 19, and a first spring 21 is connected between the connecting frame 20 and the sealing door 19;

[0073] Specifically, the handwheel 18 rotates, causing the screw 14 to rotate, and the rotating rod 15 to rotate. Driven by the thread, the screw 14 drives the rotating rod 15 and the sealing block 16 to move downward. At this time, under the action of gravity, the top of the rotating rod 15 is at the bottom of the inner groove of the screw 14. Under the connection of the connecting frame 20, the sealing door 19 moves downward to seal the second drain port 302 in advance. Then the sealing block 16 drives the connecting frame 20 to continue to move downward, and the first spring 21 is compressed to generate elastic force. Through the compression of the first spring 21, in order to adapt to the continued downward movement of the sealing block 16, the sealing block 16 begins to seal the first drain port 301. Finally, under the support force of the valve seat 3, the rotating rod 15 moves upward along the inside of the screw 14 until it moves to the top of the screw 14, completing the complete sealing of the first drain port 301.

[0074] As a further embodiment of the present invention, it also includes:

[0075] The piston assembly is slidably connected in the storage box 4. An arc-shaped slide groove 401 is provided in the storage box 4. A first connecting pin 7 is fixedly connected to the outer wall of the piston assembly. The first connecting pin 7 is slidably connected in the arc-shaped slide groove 401.

[0076] Pipe 5, the top of which is fixedly connected to the bottom of the storage box 4, and the bottom of which extends to above the top of the valve seat 3; it should be noted that the distance between the bottom of the pipe 5 and the top of the valve seat 3 is no more than 0.5 cm;

[0077] A rotary drive assembly, the rotary drive assembly is used to drive the piston assembly to rotate;

[0078] The rotary drive assembly includes:

[0079] Two telescopic rods 22, the bottom ends of the telescopic ends of the two telescopic rods 22 are fixedly connected to the top of the piston assembly, the top ends of the two telescopic rods 22 are fixedly connected to a driving disk 24, and the driving disk 24 is rotatably connected to the outer wall of the threaded sleeve 13;

[0080] Two driving chutes 25, the two driving chutes 25 are symmetrically arranged at the top of the driving disk 24, one end of the driving chutes 25 is close to the center of the driving disk 24, and the other end is far away from the center of the driving disk 24;

[0081] Two L-shaped drive frames 26, the two L-shaped drive frames 26 are symmetrically slidably connected to the top of the valve cover 2, the top of the L-shaped drive frame 26 is fixedly connected with a second connecting pin 27, and the second connecting pin 27 is slidably connected in the driving slide groove 25;

[0082] A pushing assembly, the pushing assembly is used to push the L-shaped driving frame 26;

[0083] The push components include:

[0084] A driving groove 28, which is provided on the outer side wall of the L-shaped driving frame 26, and has a straight groove and an oblique groove;

[0085] A driving rod 29, the top end of which is rotatably connected to the outer wall of the hand wheel 18, the bottom end of which is fixedly connected to a third connecting pin 10, and the third connecting pin 10 is slidably connected in the driving groove 28;

[0086] Specifically, during the rotation of the hand wheel 18, the hand wheel 18 moves downward, causing the driving rod 29 to move downward and move along the driving groove 28. The driving rod 29 first moves along the straight groove, and after the sealing block 16 seals the first drain port 301, the driving rod 29 moves along the inclined groove. At this time, the screw rod 14 continues to move downward, and the top end of the rotating rod 15 moves upward along the inner groove of the screw rod 14.

[0087] In the process of the driving rod 29 moving along the inclined groove, the L-shaped driving frame 26 is driven by the inclined groove to move toward the center of the driving disk 24, and the driving slide 25 is driven to rotate the driving disk 24, so that the two telescopic rods 22 are rotated, thereby rotating the piston assembly, and driven by the arc-shaped slide 401, the piston assembly moves downward, the telescopic rod 22 is extended, and the piston assembly compresses the fluid medium in the storage box 4, so that the fluid medium is discharged through the pipeline 5 to fill the water inlet chamber 103, increase the force on the sealing door 19 and the sealing block 16, and improve the sealing of the valve body 1;

[0088] Similarly, when the valve body 1 needs to be opened, the piston assembly moves upward and extracts the fluid medium in the water inlet chamber 103 through the pipe 5 to reduce the effect of the fluid medium on the sealing door 19 and the sealing block 16, thereby facilitating the opening of the valve and reducing the difficulty of opening the valve body 1.

[0089] As a further embodiment of the present invention, the piston assembly comprises:

[0090] The sliding shell 6 is slidably connected in the storage box 4, the first connecting pin 7 is fixedly connected to the outer wall of the sliding shell 6, the bottom end of the telescopic rod 22 is fixedly connected to the top of the sliding shell 6, the bottom end of the sliding shell 6 is slidably connected with a compression block 8, and a second spring 9 is fixedly connected between the compression block 8 and the sliding shell 6;

[0091] Specifically, by setting the sliding shell 6 and the compression block 8, in the process of the sliding shell 6 driving the compression block 8 to move downward, as the fluid medium in the water inlet chamber 103 is filled, the compression block 8 moves upward along the sliding shell 6, and the second spring 9 generates elastic force, which is beneficial to increase the water pressure in the water inlet chamber 103, and then increase the force on the sealing door 19 and the sealing block 16, thereby improving the sealing of the valve body 1.

[0092] As a further embodiment of the present invention, an air pressure sensor 11 is provided in the sliding shell 6, and the air pressure sensor 11 is used to detect the air pressure change in the sliding shell 6;

[0093] Specifically, by setting up an air pressure sensor 11 to detect changes in air pressure in the sliding shell 6, if the first drain port 301 leaks, the water pressure in the water inlet chamber 103 will be reduced, and then under the action of the second spring 9, the compression block 8 will move downward to compress the fluid medium in the storage box 4 and make it enter the water inlet chamber 103. The downward movement of the compression block 8 will reduce the air pressure in the sliding shell 6, so that it can be judged whether the valve body 1 is leaking based on the changes in air pressure in the sliding shell 6.

[0094] As a further embodiment of the present invention, it also includes:

[0095] A rotating ring 23, the rotating ring 23 is rotatably connected to the valve cover 2 and the sealing sleeve 12 respectively, and the rotating ring 23 is fixedly connected to the two telescopic rods 22;

[0096] Specifically, the rotating ring 23 is provided to seal the valve cover 2 to prevent foreign matter from entering the storage box 4 .

[0097] As a further embodiment of the present invention, a sealing plug 17 is fixedly connected to the bottom end of the sealing block 16;

[0098] Specifically, by providing the sealing plug 17, the sealing of the first drain port 301 is further improved.

[0099] The working principle of the present invention is as follows:

[0100] When the valve body 1 needs to be closed, the second drain port 302 is first sealed by the second sealing component, and the water inlet 101 is closed, so that the fluid medium stops being injected into the water inlet cavity 103, and then the first drain port 301 is sealed by the first sealing component. Since the fluid medium stops being injected into the water inlet cavity 103 at this time, it is helpful to reduce the resistance of the first sealing component in sealing the first drain port 301, and in the process of the first sealing component sealing the first drain port 301, the fluid medium in the water inlet cavity 103 will flow out through the first drain port 301 and enter the drainage cavity 104 until the first sealing component seals the first drain port 301. At this time, the water inlet cavity 103 is not filled with the fluid medium;

[0101] After the first sealing assembly seals the first drain port 301, the same fluid medium is injected into the water inlet cavity 103 through the storage box 4, so that the water inlet cavity 103 is filled with the fluid medium to increase the force acting on the first sealing assembly and the second sealing assembly, thereby facilitating the improvement of the sealing of the first drain port 301 and the second drain port 302;

[0102] When the valve body 1 needs to be opened, the fluid medium in the water inlet chamber 103 is first extracted through the storage box 4 to reduce the fluid medium in the water inlet chamber 103, thereby reducing the resistance of the fluid medium to the first sealing component and the second sealing component, which is conducive to reducing the difficulty of opening the valve;

[0103] Then, the first drain port 301 is opened to connect the water inlet chamber 103 and the water discharge chamber 104 in advance, and finally, the second drain port 302 is opened to allow the fluid medium to enter the water inlet chamber 103 through the second drain port 302 and then enter the water discharge chamber 104 through the first drain port 301.

[0104] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A high pressure differential drain stop valve for a power station, characterized in that: include: A valve body (1), the top end of the valve body (1) being fixedly connected to a valve cover (2) via a flange, the left end of the valve body (1) being a water inlet (101), and the right end being a water outlet (102); A valve seat (3), the valve seat (3) being fixedly connected to the valve body (1) to divide the interior of the valve body (1) into a water inlet chamber (103) and a water outlet chamber (104), the top of the valve seat (3) being provided with a first water drain port (301), and the left side wall of the valve seat (3) being provided with a second water drain port (302); A first sealing component, the first sealing component is used to seal the first drain port (301); A second sealing component, the second sealing component is used to seal the second drain port (302); A storage box (4), the storage box (4) being fixedly connected to the inner wall of the valve cover (2), the storage box (4) being used to adjust the force exerted by the fluid medium in the water inlet chamber (103) on the first sealing assembly and the second sealing assembly; The first sealing assembly comprises: A sealing sleeve (12), wherein the sealing sleeve (12) penetrates the bottom end of the storage box (4) and is fixedly connected to the storage box (4), and the top end of the sealing sleeve (12) penetrates the top of the valve cover (2); A threaded sleeve (13), the bottom end of the threaded sleeve (13) is fixedly connected to the top end of the sealing sleeve (12), and the threaded sleeve (13) is internally threaded with a screw (14); A rotating rod (15), the rotating rod (15) is slidably connected in the sealing sleeve (12), the top end of the rotating rod (15) is slidably inserted in the bottom end of the screw rod (14), the bottom end of the rotating rod (15) is rotatably connected to a sealing block (16), and the sealing block (16) is located directly above the first drain port (301); A hand wheel (18), wherein the hand wheel (18) is fixedly connected to the top end of the screw rod (14); The second sealing assembly comprises: A sealing door (19), wherein the sealing door (19) is slidably connected to the left side wall of the valve seat (3); Two connecting frames (20), one end of the two connecting frames (20) is fixedly connected to the sealing block (16), and the other end is slidably connected to the side wall of the sealing door (19), and a first spring (21) is connected between the connecting frame (20) and the sealing door (19).

2. A high pressure differential drain stop valve for power station according to claim 1, characterized in that: Also includes: A piston assembly, the piston assembly is slidably connected in a storage box (4), an arc-shaped slide groove (401) is provided in the storage box (4), a first connecting pin (7) is fixedly connected to an outer wall of the piston assembly, and the first connecting pin (7) is slidably connected in the arc-shaped slide groove (401); A pipeline (5), the top end of the pipeline (5) is fixedly connected to the bottom end of the storage box (4), and the bottom end of the pipeline (5) extends to above the top end of the valve seat (3); A rotation drive assembly is used to drive the piston assembly to rotate.

3. A high pressure differential drain stop valve for power station according to claim 2, characterized in that: The rotary drive assembly comprises: Two telescopic rods (22), the bottom ends of the telescopic ends of the two telescopic rods (22) are fixedly connected to the top end of the piston assembly, the top ends of the two telescopic rods (22) are fixedly connected to a driving disk (24), and the driving disk (24) is rotatably connected to the outer wall of the threaded sleeve (13); Two driving slide grooves (25), the two driving slide grooves (25) are symmetrically arranged at the top of the driving disk (24), one end of the driving slide groove (25) is close to the center of the driving disk (24), and the other end is far from the center of the driving disk (24); Two L-shaped drive frames (26), the two L-shaped drive frames (26) are symmetrically slidably connected to the top of the valve cover (2), the top of the L-shaped drive frame (26) is fixedly connected to a second connecting pin (27), and the second connecting pin (27) is slidably connected in the driving slide groove (25); A pushing component is used to push the L-shaped driving frame (26).

4. A high pressure differential drain stop valve for power station according to claim 3, characterized in that: The pushing component comprises: A driving groove (28), the driving groove (28) being formed on the outer side wall of the L-shaped driving frame (26), the driving groove (28) comprising a straight groove and an oblique groove; A driving rod (29), the top end of which is rotatably connected to the outer wall of the hand wheel (18), the bottom end of which is fixedly connected to a third connecting pin (10), and the third connecting pin (10) is slidably connected in the driving groove (28).

5. The high pressure differential drain stop valve for power station according to claim 3, characterized in that: The piston assembly comprises: A sliding shell (6), wherein the sliding shell (6) is slidably connected in the storage box (4), the first connecting pin (7) is fixedly connected to the outer wall of the sliding shell (6), the bottom end of the telescopic rod (22) is fixedly connected to the top end of the sliding shell (6), the bottom end of the sliding shell (6) is slidably connected to a compression block (8), and a second spring (9) is fixedly connected between the compression block (8) and the sliding shell (6).

6. A high pressure differential drain stop valve for power station according to claim 5, characterized in that: An air pressure sensor (11) is arranged inside the sliding shell (6), and the air pressure sensor (11) is used to detect changes in air pressure inside the sliding shell (6).

7. The high-pressure differential drain stop valve for power stations according to claim 3, characterized in that: Also includes: A rotating ring (23), wherein the rotating ring (23) is rotatably connected to the valve cover (2) and the sealing sleeve (12) respectively, and the rotating ring (23) is fixedly connected to the two telescopic rods (22).

8. The high-pressure differential drain stop valve for power stations according to claim 1, characterized in that: A sealing plug (17) is fixedly connected to the bottom end of the sealing block (16).

Images