Wear-resistant high-pressure power station gate valve

Abstract

The application discloses a wear-resistant high-pressure power station gate valve and belongs to the technical field of gate valves. The wear-resistant high-pressure power station gate valve comprises a lower valve shell, an upper valve shell is arranged at the upper end of the lower valve shell, a gasket is arranged between the lower valve shell and the upper valve shell, the lower valve shell and the upper valve shell are fixed through a plurality of fixing bolts, a valve rod is slidably connected to the upper end of the upper valve shell, a support frame is fixedly connected to the upper end of the upper valve shell, a first sealing mechanism is arranged at the lower end of the valve rod, a second sealing mechanism is arranged between the lower valve shell and the upper valve shell, and a third sealing mechanism is arranged between the valve rod and the upper valve shell. Through the use of the first sealing mechanism, the second sealing mechanism and the third sealing mechanism, the wear of the second valve core is greatly reduced, the sealing performance among the upper valve shell, the lower valve shell and the valve rod is improved, the pressure difference between two sides can be balanced through the use of a bypass valve, the operation difficulty and equipment loss are reduced, and the system safety is ensured.

Description

Technical Field

[0001] This invention belongs to the field of gate valve technology, specifically relating to a wear-resistant high-voltage power station gate valve. Background Technology

[0002] High-pressure power plant gate valves are special valves designed specifically for high-temperature and high-pressure pipelines in thermal, hydroelectric, and nuclear power plant systems. Their core function is to reliably cut off or connect the medium (such as water or steam) within the pipeline, and to completely isolate the pipeline system in the event of maintenance or malfunction. With a robust structure, excellent sealing performance, and extremely high pressure resistance, they are key control devices ensuring the safe and stable operation of power plant power systems.

[0003] Because gate valves are used in high temperature and high pressure environments, wear can easily occur between the valve core and the pipeline, leading to a decrease in sealing performance. At the same time, the high temperature and high pressure medium will also exert greater pressure on the joints of the valve stem and valve body, affecting the overall sealing effect. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a wear-resistant high-voltage power station gate valve.

[0005] The technical solution adopted to solve the above technical problems is: a wear-resistant high-voltage power station gate valve, including a lower valve shell, an upper valve shell is provided at the upper end of the lower valve shell, a gasket is provided between the lower valve shell and the upper valve shell, the lower valve shell and the upper valve shell are fixed by a number of fixing bolts, a valve stem is slidably connected through the upper end of the upper valve shell, a support frame is fixedly connected to the upper end of the upper valve shell, a first sealing mechanism is provided at the lower end of the valve stem, a second sealing mechanism is provided between the lower valve shell and the upper valve shell, and a third sealing mechanism is provided between the valve stem and the upper valve shell;

[0006] The first sealing mechanism includes a second valve core fixedly connected to the lower end of the valve stem. A second spring is fixedly connected to the upper end of the second valve core. A fixed plate is fixedly connected to the lower end of the second spring. Both ends of the fixed plate are rotatably connected to connecting rods. A fixed seat is rotatably connected to the end of the connecting rod away from the fixed plate. A movable plate is fixedly connected to the end of the fixed seat away from the connecting rod.

[0007] Through the above technical solution, the use of the first sealing mechanism, the second sealing mechanism and the third sealing mechanism greatly reduces the wear of the second valve core and improves the sealing performance between the upper valve body, the lower valve body and the valve stem.

[0008] Furthermore, connecting pipes are fixedly connected to both ends of the lower valve body, and a flange is fixedly connected to the end of the connecting pipe away from the lower valve body. A bypass pipe is fixedly connected to the connecting pipe, and a bypass valve is installed on the bypass pipe. A support frame is fixedly connected to the upper end of the upper valve body, and a handwheel is rotatably connected to the upper end of the support frame. The handwheel is threadedly engaged with the valve stem. A reinforcing rib is provided between the lower valve body and the connecting pipe.

[0009] The above technical solution, through the use of a bypass valve, can balance the pressure difference on both sides, reduce the difficulty of operation and equipment wear, and ensure system safety. The valve stem is raised or lowered by the handwheel, and the valve stem raises or lowers the second valve core, thereby opening or closing the valve.

[0010] Furthermore, a first groove and a second groove are provided in the end of the connecting pipe near the lower valve housing. A first spring is fixedly connected in the first groove. A sealing ring is fixedly connected to the end of the first spring away from the first groove. A sealing plate is fixedly connected to the end of the sealing ring away from the first spring. A first sealing rubber ring is fixedly connected to the end of the sealing plate away from the sealing ring.

[0011] Through the above technical solution, the high-pressure medium pushes the sealing plate in the first groove and the second groove. Under the pressure of the first spring and the high-pressure medium, the sealing plate cooperates with the moving plate to press the second sealing rubber ring tightly.

[0012] Furthermore, a second sealing rubber ring is provided between the moving plate and the sealing plate. The second sealing rubber ring is inclined on both sides. The moving plate and the sealing plate are both inclined on the side closest to the second sealing rubber ring. Several sliding rods are fixedly connected to the moving plate. Through holes are provided on both sides of the second valve core. The through holes and the sliding rods slide against each other. A push rod is fixedly connected to the lower end of the fixed plate. A buffer head is fixedly connected to the end of the push rod away from the fixed plate. The push rod slides through and connects to the second valve core.

[0013] With the above technical solution, when the second valve core descends, the lower valve shell presses against the buffer head, causing the push rod to push the fixed plate upward. The upward movement of the fixed plate pushes the moving plate to both sides through the connecting rod. Meanwhile, the sealing plate moves towards the moving plate under the pressure of the high-pressure medium. The moving plate and the sealing plate simultaneously squeeze the second sealing rubber ring, thereby improving the sealing effect. During the upward movement of the second valve core, the second spring pushes the fixed plate downward, thereby retracting the moving plate. During the rising and falling of the second valve core, there is no need for friction with the second sealing rubber ring, thereby reducing the wear of the second valve core and increasing its service life.

[0014] Furthermore, the bypass valve includes a valve body fixedly connected to a bypass pipe, a first valve core rotatably connected to the valve body, a connecting shaft fixedly connected to the first valve core, a handle fixedly connected to the end of the connecting shaft away from the first valve core, and the connecting shaft rotatably connecting to the valve body.

[0015] With the above technical solution, when it is necessary to open the valve, the bypass valve can be opened slowly first to balance the pressure on both sides of the second valve core. After the pressure on both sides is basically the same, the valve can be easily opened in a state of almost no pressure difference, which greatly reduces the difficulty of operation and equipment wear and ensures system safety.

[0016] Furthermore, the second sealing mechanism includes a third groove in the upper valve housing and a fourth groove in the lower valve housing. A first wedge is fixedly connected in the third groove, a second wedge is fixedly connected in the fourth groove, and a push plate is slidably connected in the third and fourth grooves.

[0017] The above technical solution allows the first and second wedges to press against each other by moving the push plate, thereby increasing the pressure between the upper and lower valve bodies and improving the sealing performance.

[0018] Furthermore, a pair of third sealing rubber rings are fixedly connected to the outside of the push plate, and a pair of support rods are fixedly connected to the end of the push plate near the first wedge block. A roller is rotatably connected to the end of the support rod away from the push plate.

[0019] With the above technical solution, when the high-pressure medium fills the valve body, it pushes the push plate to move outward. The push plate pushes the roller to move through the support rod. The roller squeezes the upper valve body and the lower valve body more tightly through the first wedge and the second wedge, which greatly improves the sealing effect between the upper valve body and the lower valve body.

[0020] Furthermore, the third sealing mechanism includes a fifth groove inside the upper valve housing, a rubber sleeve fixedly connected inside the fifth groove, a first sealing valve fixedly connected to the upper end of the rubber sleeve, a second sealing valve fixedly connected to the lower end of the rubber sleeve, a sealing block fixedly connected in the middle of the rubber sleeve, and several connecting pipes opened inside the upper valve housing.

[0021] Through the above technical solution, the high-pressure medium enters the space between the rubber sleeve and the upper valve body through the connecting pipe, causing the rubber sleeve to expand. This causes the first sealing valve, the second sealing valve, and the sealing block to approach the valve stem, blocking the gap between the valve stem and the upper valve body. At the same time, the sealing block, blocked by the valve stem, holds the rubber sleeve in place, preventing it from expanding too much and bursting.

[0022] The beneficial effects of the present invention are as follows: (1) Through the use of the first sealing mechanism, when the second valve core descends, the lower valve shell presses against the buffer head, causing the push rod to push the fixed plate upward. The upward movement of the fixed plate pushes the moving plate to both sides through the connecting rod, while the sealing plate moves towards the moving plate under the push of the high pressure medium. The moving plate and the sealing plate simultaneously squeeze the second sealing rubber ring, thereby improving the sealing effect. During the process of the second valve core rising, the second spring pushes the fixed plate downward, thereby retracting the moving plate. During the rising and falling process of the second valve core, there is no need to generate friction with the second sealing rubber ring, thereby reducing the wear of the second valve core and improving its service life; (2) Through the use of the second sealing mechanism, when the high pressure medium fills the valve shell, When the push plate is pushed outward, the push plate pushes the roller to move through the support rod. The roller squeezes the upper valve shell and the lower valve shell more tightly through the first wedge and the second wedge, which greatly improves the sealing effect between the upper valve shell and the lower valve shell. (3) In this invention, the use of the third sealing mechanism allows the high pressure medium to enter the connecting pipe and enter the space between the rubber sleeve and the upper valve shell, pushing the rubber sleeve to expand inward. This causes the rubber sleeve to bring the first sealing valve and the second sealing plate closer to the squeeze valve stem. During the movement of the valve stem, the gap between the valve stem and the upper valve shell is blocked by the first sealing valve and the second sealing valve, thereby avoiding leakage. At the same time, the use of the sealing block can prevent the rubber sleeve from expanding too much and breaking. Attached Figure Description

[0023] Figure 1 This is a first-view structural diagram of the present invention;

[0024] Figure 2 This is a second-view structural diagram of the present invention;

[0025] Figure 3 This is a side sectional view of the present invention;

[0026] Figure 4 yes Figure 3 Enlarged view of point A;

[0027] Figure 5 yes Figure 3 Enlarged view of point B;

[0028] Figure 6 yes Figure 3 Enlarged view of point C;

[0029] Figure 7 This is a top sectional view of the present invention;

[0030] Figure 8 This is an exploded structural diagram of the first sealing mechanism of the present invention;

[0031] Figure 9 This is an exploded view of the valve core structure of the present invention;

[0032] Figure 10 This is a diagram of the push plate structure of the present invention;

[0033] Figure 11 This is a cross-sectional view of the third sealing mechanism of the present invention;

[0034] Figure 12 This is a perspective view of the third sealing mechanism of the present invention.

[0035] Reference numerals: 1. Lower valve housing; 2. Upper valve housing; 3. Fixing bolt; 4. Valve stem; 5. Bypass pipe; 6. Bypass valve; 61. Valve body; 62. First valve core; 63. Connecting shaft; 64. Handle; 7. First sealing mechanism; 71. First groove; 72. First spring; 73. Second groove; 74. Sealing ring; 75. Sealing plate; 76. First sealing rubber ring; 77. Second sealing rubber ring; 78. Second valve core; 79. Through hole; 710. Slide rod; 711. Moving plate; 712. Second spring; 713. Fixing plate; 714. Connecting rod. 715. Rod; 716. Fixed seat; 717. Push rod; 718. Buffer head; 8. Second sealing mechanism; 81. Third groove; 82. Fourth groove; 83. First wedge; 84. Second wedge; 85. Push plate; 86. Third sealing rubber ring; 87. Support rod; 88. Roller; 9. Third sealing mechanism; 91. Fifth groove; 92. Connecting pipe; 93. Rubber sleeve; 94. First sealing valve; 95. Sealing block; 96. Second sealing valve; 10. Support frame; 11. Handwheel; 12. Reinforcing rib; 13. Connecting pipe; 14. Flange. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] like Figures 1-12 As shown in this embodiment, a wear-resistant high-voltage power station gate valve includes a lower valve shell 1, an upper valve shell 2 is provided at the upper end of the lower valve shell 1, a gasket is provided between the lower valve shell 1 and the upper valve shell 2, the lower valve shell 1 and the upper valve shell 2 are fixed by a number of fixing bolts 3, a valve stem 4 is slidably connected through the upper end of the upper valve shell 2, and a support frame 10 is fixedly connected to the upper end of the upper valve shell 2. The upper valve shell 2 and the lower valve shell 1 are pre-tightened by the fixing bolts 3, and the sealing effect is improved by the gasket.

[0038] The lower valve body 1 is fixedly connected to both ends of a connecting pipe 13. A flange 14 is fixedly connected to the end of the connecting pipe 13 away from the lower valve body 1. A bypass pipe 5 is fixedly connected to the connecting pipe 13. A bypass valve 6 is installed on the bypass pipe 5. A support frame 10 is fixedly connected to the upper end of the upper valve body 2. A handwheel 11 is rotatably connected to the upper end of the support frame 10. The handwheel 11 is threadedly engaged with the valve stem 4. A reinforcing rib 12 is provided between the lower valve body 1 and the connecting pipe 13. The overall strength can be improved by the setting of the reinforcing rib 12. The gate valve is installed on the pipe through the flange 14.

[0039] The bypass valve 6 includes a valve body 61 fixedly connected to the bypass pipe 5. A first valve core 62 is rotatably connected inside the valve body 61. A connecting shaft 63 is fixedly connected to the first valve core 62. A handle 64 is fixedly connected to the end of the connecting shaft 63 away from the first valve core 62. The connecting shaft 63 passes through and rotatably connects to the valve body 61. When the valve needs to be closed, the handle 64 drives the connecting shaft 63 to rotate, which in turn drives the first valve core 62 to rotate, thus closing the bypass valve 6. When the valve needs to be opened, the handle 64 drives the first valve core 62 to rotate slowly, causing the bypass valve 6 to open slowly and balance the pressure on both sides of the second valve core 78. Once the pressure on both sides is basically the same, the valve can be easily opened in a state of almost no pressure difference, greatly reducing the difficulty of operation and equipment wear, and ensuring system safety.

[0040] like Figure 4 , Figure 6 , Figure 8 and Figure 9 As shown, a first sealing mechanism 7 is provided at the lower end of the valve stem 4. The first sealing mechanism 7 includes a second valve core 78 fixedly connected to the lower end of the valve stem 4. A second spring 712 is fixedly connected to the upper end of the second valve core 78. A fixed plate 713 is fixedly connected to the lower end of the second spring 712. Both ends of the fixed plate 713 are rotatably connected to connecting rods 714. A fixed seat 715 is rotatably connected to the end of the connecting rod 714 away from the fixed plate 713. A moving plate 711 is fixedly connected to the end of the fixed seat 715 away from the connecting rod 714. When the handwheel 11 is turned, the valve stem 4 is lowered. The valve stem 4 pushes the second valve core 78 to lower. During the descent of the second valve core 78, the buffer head 717 contacts the lower valve housing 1. The lower valve housing 1 presses against the buffer head 717, causing the push rod 716 to move upward relative to the second valve core 78, thereby pushing the fixed plate 713 upward. The fixed plate 713 moves the moving plate 711 to both sides through the connecting rod 714, thereby squeezing the second sealing rubber ring 77.

[0041] A first groove 71 and a second groove 73 are provided in the end of the connecting pipe 13 near the lower valve body 1. A first spring 72 is fixedly connected in the first groove 71. A sealing ring 74 is fixedly connected to the end of the first spring 72 away from the first groove 71. A sealing plate 75 is fixedly connected to the end of the sealing ring 74 away from the first spring 72. A first sealing rubber ring 76 is fixedly connected to the end of the sealing plate 75 away from the sealing ring 74. Since the connecting pipe 13 is filled with high-pressure medium, the high-pressure medium pushes the sealing plate 75 in the first groove 71 and the second groove 73. Under the pressure of the first spring 72 and the high-pressure medium, the sealing plate 75 cooperates with the moving plate 711 to press the second sealing rubber ring 77 tightly, thereby improving the sealing effect. At the same time, the connecting rod 714 and the fixed seat 715 form a straight line, which can withstand greater pressure.

[0042] A second sealing rubber ring 77 is provided between the movable plate 711 and the sealing plate 75. The two sides of the second sealing rubber ring 77 are inclined. The sides of the movable plate 711 and the sealing plate 75 closest to the second sealing rubber ring 77 are also inclined. Several sliding rods 710 are fixedly connected to the movable plate 711. Through holes 79 are provided on both sides of the second valve core 78. The through holes 79 and the sliding rods 710 slide against each other. A push rod 716 is fixedly connected to the lower end of the fixed plate 713. A buffer head 717 is fixedly connected to the end of the push rod 716 away from the fixed plate 713. The push rod 716 slides through and connects to the second valve core 78. As the second valve core 78 rises, the second spring 712 pushes the fixed plate 713 down. The fixed plate 713 retracts the movable plate 711 through the connecting rod 714, thereby avoiding wear between the movable plate 711 and the second sealing rubber ring 77 and greatly improving the overall service life.

[0043] like Figure 5 and Figure 10 As shown, a second sealing mechanism 8 is provided between the lower valve housing 1 and the upper valve housing 2. The second sealing mechanism 8 includes a third groove 81 opened in the upper valve housing 2 and a fourth groove 82 opened in the lower valve housing 1. A first wedge block 83 is fixedly connected in the third groove 81 and a second wedge block 84 is fixedly connected in the fourth groove 82. A push plate 85 is slidably connected in the third groove 81 and the fourth groove 82. A pair of third sealing rubber rings 86 are fixedly connected to the outside of the push plate 85. A pair of support rods 87 are fixedly connected to the end of the push plate 85 near the first wedge block 83. A roller 88 is rotatably connected to the end of the support rod 87 away from the push plate 85. When the high-pressure medium fills the valve, it pushes the push plate 85 to move outward. The push plate 85 drives the roller 88 to move outward through the support rods 87. The roller 88, through the cooperation of the first wedge block 83 and the second wedge block 84, squeezes the upper valve housing 2 and the lower valve housing 1 against each other, thereby improving the sealing between the upper valve housing 2 and the lower valve housing 1.

[0044] like Figure 11 and Figure 12As shown, a third sealing mechanism 9 is provided between the valve stem 4 and the upper valve body 2. The third sealing mechanism 9 includes a fifth groove 91 opened in the upper valve body 2. A rubber sleeve 93 is fixedly connected in the fifth groove 91. A first sealing valve 94 is fixedly connected to the upper end of the rubber sleeve 93, and a second sealing valve 96 is fixedly connected to the lower end of the rubber sleeve 93. A sealing block 95 is fixedly connected in the middle of the rubber sleeve 93. Several connecting pipes 92 are opened in the upper valve body 2. The high-pressure medium enters the space between the rubber sleeve 93 and the upper valve body 2 through the connecting pipes 92, causing the rubber sleeve 93 to expand. This causes the first sealing valve 94, the second sealing valve 96 and the sealing block 95 to approach the valve stem 4, blocking the gap between the valve stem 4 and the upper valve body 2. At the same time, the sealing block 95, blocked by the valve stem 4, pushes against the rubber sleeve 93 to prevent the rubber sleeve 93 from expanding too much and bursting.

[0045] The working principle of this embodiment is as follows: the gate valve is installed on the pipeline through the flange 14. When the valve needs to be closed, the connecting shaft 63 is rotated by the handle 64. The connecting shaft 63 rotates the first valve core 62 to close the bypass valve 6. Then, the handwheel 11 is turned to lower the valve stem 4. The valve stem 4 pushes the second valve core 78 to lower. During the descent of the second valve core 78, the buffer head 717 contacts the lower valve body 1. The lower valve body 1 presses against the buffer head 717, causing the push rod 716 to move upward relative to the second valve core 78, thereby pushing the fixed plate 713 to move upward. The fixed plate 713 moves the moving plate 711 to both sides through the connecting rod 714, thereby squeezing the second sealing rubber ring 77.

[0046] Since the connecting pipe 13 is filled with high-pressure medium, the high-pressure medium pushes the sealing plate 75 in the first groove 71 and the second groove 73. Under the pressure of the first spring 72 and the high-pressure medium, the sealing plate 75 cooperates with the moving plate 711 to press the second sealing rubber ring 77, thereby improving the sealing effect. At the same time, the connecting rod 714 and the fixed seat 715 form a straight line, which can withstand greater pressure.

[0047] When the valve needs to be opened, the first valve core 62 is slowly rotated by the handle 64, which slowly opens the bypass valve 6 and balances the pressure on both sides of the second valve core 78. After the pressure on both sides is basically the same, the valve can be easily opened in a state of almost no pressure difference, which greatly reduces the difficulty of operation and equipment wear and ensures system safety. At the same time, as the second valve core 78 rises, the second spring 712 pushes the fixed plate 713 down, and the fixed plate 713 retracts the moving plate 711 through the connecting rod 714, thereby avoiding wear between the moving plate 711 and the second sealing rubber ring 77 and greatly improving the overall service life.

[0048] When the high-pressure medium fills the valve, it pushes the push plate 85 to move outward. The push plate 85 drives the roller 88 to move outward through the support rod 87. The roller 88, through the cooperation of the first wedge block 83 and the second wedge block 84, squeezes the upper valve shell 2 and the lower valve shell 1 against each other, thereby improving the sealing between the upper valve shell 2 and the lower valve shell 1.

[0049] At the same time, the high-pressure medium enters the space between the rubber sleeve 93 and the upper valve body 2 through the connecting pipe 92, causing the rubber sleeve 93 to expand. This causes the first sealing valve 94, the second sealing valve 96, and the sealing block 95 to approach the valve stem 4, blocking the gap between the valve stem 4 and the upper valve body 2. Meanwhile, the sealing block 95, blocked by the valve stem 4, holds the rubber sleeve 93 in place, preventing the rubber sleeve 93 from expanding too much and bursting.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A wear-resistant high-voltage power station gate valve, comprising a lower valve body (1), characterized in that: The lower valve housing (1) is provided with an upper valve housing (2) at its upper end. A gasket is provided between the lower valve housing (1) and the upper valve housing (2). The lower valve housing (1) and the upper valve housing (2) are fixed by several fixing bolts (3). A valve stem (4) is slidably connected through the upper end of the upper valve housing (2). A support frame (10) is fixedly connected to the upper end of the upper valve housing (2). A first sealing mechanism (7) is provided at the lower end of the valve stem (4). A second sealing mechanism (8) is provided between the lower valve housing (1) and the upper valve housing (2). A third sealing mechanism (9) is provided between the valve stem (4) and the upper valve housing (2). The first sealing mechanism (7) includes a second valve core (78) fixedly connected to the lower end of the valve stem (4). A second spring (712) is fixedly connected to the upper end of the second valve core (78). A fixed plate (713) is fixedly connected to the lower end of the second spring (712). Both ends of the fixed plate (713) are rotatably connected to connecting rods (714). A fixed seat (715) is rotatably connected to the end of the connecting rod (714) away from the fixed plate (713). A movable plate (711) is fixedly connected to the end of the fixed seat (715) away from the connecting rod (714). The lower valve housing (1) is fixedly connected to two ends of a connecting pipe (13). A flange (14) is fixedly connected to one end of the connecting pipe (13) away from the lower valve housing (1). A bypass pipe (5) is fixedly connected to the connecting pipe (13). A bypass valve (6) is installed on the bypass pipe (5). A support frame (10) is fixedly connected to the upper end of the upper valve housing (2). A handwheel (11) is rotatably connected to the upper end of the support frame (10). The handwheel (11) is threadedly engaged with the valve stem (4). A reinforcing rib (12) is provided between the lower valve housing (1) and the connecting pipe (13). The connecting pipe (13) has a first groove (71) and a second groove (73) at one end near the lower valve shell (1). A first spring (72) is fixedly connected in the first groove (71). A sealing ring (74) is fixedly connected at the end of the first spring (72) away from the first groove (71). A sealing plate (75) is fixedly connected at the end of the sealing ring (74) away from the first spring (72). A first sealing rubber ring (76) is fixedly connected at the end of the sealing plate (75) away from the sealing ring (74). A second sealing rubber ring (77) is provided between the movable plate (711) and the sealing plate (75). The second sealing rubber ring (77) is inclined on both sides. The movable plate (711) and the sealing plate (75) are both inclined on the side near the second sealing rubber ring (77). Several sliding rods (710) are fixedly connected to the movable plate (711). Through holes (79) are provided on both sides of the second valve core (78). The through holes (79) and the sliding rods (710) slide against each other. A push rod (716) is fixedly connected to the lower end of the fixed plate (713). A buffer head (717) is fixedly connected to the end of the push rod (716) away from the fixed plate (713). The push rod (716) slides through and connects to the second valve core (78).

2. The wear-resistant high-pressure power station gate valve according to claim 1, characterized in that, The bypass valve (6) includes a valve body (61) fixedly connected to the bypass pipe (5), a first valve core (62) rotatably connected inside the valve body (61), a connecting shaft (63) fixedly connected to the first valve core (62), a handle (64) fixedly connected to one end of the connecting shaft (63) away from the first valve core (62), and the connecting shaft (63) rotatably connecting the valve body (61) through it.

3. The wear-resistant high-pressure power station gate valve according to claim 1, characterized in that, The second sealing mechanism (8) includes a third groove (81) opened in the upper valve housing (2), a fourth groove (82) opened in the lower valve housing (1), a first wedge (83) fixedly connected in the third groove (81), a second wedge (84) fixedly connected in the fourth groove (82), and a push plate (85) slidably connected in the third groove (81) and the fourth groove (82).

4. The wear-resistant high-pressure power station gate valve according to claim 3, characterized in that, A pair of third sealing rubber rings (86) are fixedly connected to the outside of the push plate (85). A pair of support rods (87) are fixedly connected to one end of the push plate (85) near the first wedge (83). A roller (88) is rotatably connected to one end of the support rod (87) away from the push plate (85).

5. A wear-resistant high-pressure power station gate valve according to claim 1, characterized in that, The third sealing mechanism (9) includes a fifth groove (91) opened in the upper valve housing (2), a rubber sleeve (93) is fixedly connected in the fifth groove (91), a first sealing valve (94) is fixedly connected at the upper end of the rubber sleeve (93), a second sealing valve (96) is fixedly connected at the lower end of the rubber sleeve (93), a sealing block (95) is fixedly connected in the middle of the rubber sleeve (93), and several connecting pipes (92) are opened in the upper valve housing (2).

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