Hard-seal wear-resistant and scouring-resistant ball valve

Abstract

The invention belongs to the technical field of ball valves, and discloses a hard-seal wear-resistant and scouring-resistant ball valve which comprises a valve body, a valve cover is installed outside the valve body, a discharging port is formed in one end of the valve cover, and through cooperation of structures such as a corrugated pipe, surfacing stainless steel and formed stacked materials, when the valve is opened, the interior of the corrugated pipe is compressed and expands, so that the valve is opened; when the valve is closed, the interior of the corrugated pipe is restored to the original shape, the valve body and the valve cover are tightly attached, then sealing of the valve is achieved, when the valve rod moves, the telescopic movement of the corrugated pipe and tight contact of the formed stockpile act together, a reliable sealing barrier is formed, and therefore the sealing performance of the valve is improved, and the service life of the valve is prolonged. WC hard alloy is sprayed and welded in the contact area of the valve body and the valve cover, so that the abrasion resistance of the whole valve is enhanced, material damage caused by high-temperature operation is effectively avoided, and the purposes of hard sealing and heat-resistant protection on the whole valve are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of ball valves, in particular to a hard-sealed, wear-resistant and erosion-resistant ball valve. Background Art

[0002] A valve is a device used to control the direction, pressure, and flow of a fluid in a fluid system. Valves can be used to control the flow of various types of fluids, such as water, steam, oil, gas, mud, various corrosive media, liquid metals, and radioactive fluids. The working pressure and temperature ranges are very wide. In modern industry, valves, especially ball valves, are widely used in various fluid control systems. The ball valve is driven by a valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. A multi-way ball valve can not only flexibly control the confluence, diversion, and switching of flow direction of the medium in the pipeline, but can also close any channel and connect the other two channels.

[0003] Traditional ball valves have deficiencies in wear resistance, erosion resistance and sealing, especially under harsh working conditions, such as high temperature, high pressure, corrosive media, etc., their service life and reliability are often affected. Traditional ball valve material pairing is mostly metal to metal. Although it has certain hardness and wear resistance, its sealing surface and valve seat are easily damaged under long-term erosion and corrosion, resulting in reduced sealing performance and even leakage. In addition, some ball valves have general sealing performance and poor wear resistance, which cannot meet the use requirements under some special working conditions.

[0004] It is necessary to extend the service life of the ball valve by improving the overall wear resistance of the ball valve, reduce the pressure generated when the conveyed material squeezes the ball, protect the ball, and further improve the erosion resistance of the ball valve. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a hard-sealed wear-resistant and erosion-resistant ball valve.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a hard-sealed wear-resistant and erosion-resistant ball valve, comprising a valve body, a valve cover is installed on the outside of the valve body, a valve stem is movably connected to the inside of the valve body, a ball is fixed to the bottom end of the valve stem, a wear-resistant mechanism is arranged inside the valve cover, a buffer mechanism is installed inside the valve cover, a compensation mechanism is installed at the bottom end of the valve body, a valve support seat is fixed to the bottom end of the valve body, and a discharge port is opened at one end of the valve cover; The wear-resistant mechanism includes a bellows, cladding stainless steel, molded pile material and WC hard alloy. The bellows is installed inside the valve cover, the cladding stainless steel is arranged inside the valve cover, the molded pile material is arranged inside the valve cover, and the contact surface of the valve body and the valve cover is spray-welded with WC hard alloy.

[0007] Preferably, the buffer mechanism includes a servo motor, a reciprocating screw and a first connecting block, the servo motor is fixed at the bottom end of the valve cover, a reciprocating screw is fixed to the top end of the servo motor, a first connecting block is arranged on the outside of the reciprocating screw, a first buffer disk is fixed on the outside of the first connecting block, a second connecting block is arranged on the outside of the reciprocating screw, a second buffer disk is fixed on the outside of the second connecting block, and a limiting disk is fixed on the top end of the reciprocating screw.

[0008] Preferably, the reciprocating screw rod is provided with an external thread on the outside, the first connecting block and the second connecting block are provided with an internal thread on the inside, the reciprocating screw rod and the first connecting block are threadedly connected, and the reciprocating screw rod and the second connecting block are threadedly connected.

[0009] Preferably, the first buffer disk and the second buffer disk have the same shape, the first connecting block and the second connecting block are symmetrically distributed about the central axis of the valve cover, the diameter of the limit disk is larger than the diameter of the reciprocating screw rod, and the reciprocating screw rod and the valve cover are movably connected.

[0010] Preferably, the compensation mechanism includes a lower end cover, a sleeve and a first return spring, the lower end cover is arranged at the bottom end of the valve body, the top end of the lower end cover is fixed with a sleeve, the bottom end of the sleeve is fixed with a first return spring, the top end of the first return spring is arranged with a compensation block, a limiting rod is arranged at one end of the lower end cover, a mounting hole is opened inside the limiting rod, the limiting block is movably connected to the inside of the valve body, a third connecting block is fixed to the bottom end of the limiting block, and a second return spring is installed at one end of the limiting block.

[0011] Preferably, a connecting hole is formed at the bottom end of the sphere, the diameter of the sleeve is equal to the diameter of the connecting hole, and the first return spring is used to squeeze the compensation block and keep it moving upward.

[0012] Preferably, four groups of limit rods are provided, and the limit rods are evenly spaced about the central axis of the lower end cover; four groups of limit blocks are provided, and the limit blocks are evenly spaced about the central axis of the lower end cover; the second return spring is used to squeeze the limit block and keep it moving toward the sleeve.

[0013] Preferably, a first fixing bolt is provided on the outside of the valve cover, a feed port is opened at one end of the valve cover, an upper end cover is installed at the top of the valve body, a second fixing bolt is provided at the top of the upper end cover, a gear box is installed at the top of the upper end cover, and a connecting plate is installed at one end of the gear box.

[0014] Preferably, two groups of the valve covers are provided, and the valve covers are symmetrically distributed about the central axis of the valve body, and several groups of the first fixing bolts are provided, and the first fixing bolts are evenly distributed about the central axis of the valve cover.

[0015] Preferably, a plurality of groups of the second fixing bolts are provided, and the second fixing bolts are distributed at equal intervals about the central axis of the upper end cover. The output end of the gear box is connected to a valve stem, and the valve stem is movably connected to the inside of the upper end cover.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention cooperates with structures such as bellows, cladding stainless steel, and formed stacking materials. When the valve is opened, the inside of the bellows is compressed and expanded, thereby opening the valve. When the valve is closed, the inside of the bellows returns to its original state, achieving a close fit between the valve body and the valve cover, thereby achieving the sealing of the valve. When the valve stem moves, the telescopic movement of the bellows and the close contact of the formed stacking materials work together to form a reliable sealing barrier, thereby improving the sealing performance of the valve, and enhancing the durability and reliability of the valve. WC hard alloy is spray-welded in the contact area between the valve body and the valve cover to enhance the wear resistance of the entire valve, effectively avoiding material damage caused by high-temperature operation, and the cladding stainless steel is provided to make the processed surface smoother, thereby achieving the purpose of facilitating hard sealing and heat-resistant protection of the entire valve.

[0017] The present invention cooperates with structures such as the lower end cover, the sleeve, and the first return spring, so that after the ball is installed in the interior of the valve body, it will always apply a downward force due to its own weight. After the ball is in contact with the bottom of the valve body for a long time, wear will occur, which will cause a slight deviation in the position of the ball and leakage. The compensation block is pushed upward by the first return spring, so that the ball first contacts the compensation block, and the compensation block is pushed upward by the restoring force of the first return spring to provide an upward return force for the ball. A camera is provided inside the sleeve to detect the size of the compensation block in real time. When the volume of the compensation block is consumed by friction, the third connecting block can be pulled to disconnect the limit block from the limit rod, so that the lower end cover can be removed, the compensation block can be supplemented and replaced, the valve as a whole can be inspected, and then the compensation block can be installed. Since the ball is sealed by components such as bellows inside the valve body, the overall performance of the valve will not be affected when the compensation block is replaced.

[0018] The present invention arranges a servo motor, a reciprocating screw rod, a first connecting block and other structures to cooperate, so that the device can drive the first connecting block and the second connecting block to reciprocate by starting the servo motor, and then drive the first buffer plate and the second buffer plate to reciprocate, so that the first buffer plate and the second buffer plate can be in a spliced ​​state or an expanded state. In the spliced ​​state, when the ball is in a closed state, the fluid will first contact the first buffer plate and the second buffer plate when passing through the inside of the valve, and the fluid will be diffused by the shape of the first buffer plate and the second buffer plate, so that the fluid first contacts the inner wall of the valve cover and then is transported, thereby reducing the pressure on the ball and then improving the scour resistance of the ball. When the fluid needs to be transported quickly, the first buffer plate and the second buffer plate are set to the expanded state, at which time the fluid can pass quickly, thereby achieving the purpose of protecting the ball and improving the scour resistance when the invention transports the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front cross-sectional structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a schematic diagram of the overall right side structure of the present invention; Figure 4 It is a schematic structural diagram of the front view cross-section buffer mechanism of the present invention in an open state; Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of the local section at point A in the middle; Figure 6 It is a schematic diagram of the structure of the compensation mechanism of the present invention; Figure 7 It is a schematic diagram of the structure of the buffer mechanism of the present invention; Figure 8 It is a schematic diagram of the right side structure of the buffer mechanism of the present invention.

[0020] In the figure: 1. valve body; 2. valve cover; 3. first fixing bolt; 4. feed port; 5. upper end cover; 6. second fixing bolt; 7. gear box; 8. connecting plate; 9. valve stem; 10. ball; 11. wear-resistant mechanism; 1101. bellows; 1102. cladding stainless steel; 1103. forming cladding; 1104. WC hard alloy; 12. buffer mechanism; 1201. servo motor; 1202. reciprocating screw rod; 1203. First connecting block; 1204, first buffer disk; 1205, second connecting block; 1206, second buffer disk; 1207, limit disk; 13, compensation mechanism; 1301, lower end cover; 1302, sleeve; 1303, first return spring; 1304, compensation block; 1305, limit rod; 1306, limit block; 1307, third connecting block; 1308, second return spring; 14, valve support seat; 15, discharge port. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figures 1 to 8 As shown, the present invention provides a hard-sealed wear-resistant and erosion-resistant ball valve, comprising a valve body 1, a valve cover 2 is installed on the outside of the valve body 1, a valve stem 9 is movably connected inside the valve body 1, a ball 10 is fixed to the bottom end of the valve stem 9, a wear-resistant mechanism 11 is arranged inside the valve cover 2, a buffer mechanism 12 is installed inside the valve cover 2, a compensation mechanism 13 is installed at the bottom end of the valve body 1, a valve support seat 14 is fixed to the bottom end of the valve body 1, a discharge port 15 is opened at one end of the valve cover 2, a first fixing bolt 3 is arranged on the outside of the valve cover 2, two groups of the valve cover 2 are arranged, the valve cover 2 are symmetrically distributed about the central axis of the valve body 1, a plurality of groups of first fixing bolts 3 are arranged, and the first fixing bolts 3 are evenly distributed about the central axis of the valve cover 2.

[0023] like Figures 1 to 8 As shown, a feed port 4 is provided at one end of the valve cover 2, an upper end cover 5 is installed at the top of the valve body 1, a second fixing bolt 6 is provided at the top of the upper end cover 5, a gear box 7 is installed at the top of the upper end cover 5, a connecting plate 8 is installed at one end of the gear box 7, a plurality of groups of second fixing bolts 6 are provided, and the second fixing bolts 6 are evenly spaced about the central axis of the upper end cover 5, and a valve stem 9 is connected to the output end of the gear box 7, and the valve stem 9 is movably connected to the inside of the upper end cover 5.

[0024] The above scheme is adopted: by rotating the connecting disk 8 and the gear box 7, the valve stem 9 can be driven to rotate, and then the ball 10 can be driven to rotate, so that the ball 10 can be changed to an open state or a closed state, thereby completing the delivery or cutoff of the substance. This scheme is the existing technology in this field.

[0025] like Figures 1 to 5 As shown, the wear-resistant mechanism 11 includes a bellows 1101, a cladding stainless steel 1102, a molded pile material 1103 and a WC hard alloy 1104. The bellows 1101 is installed inside the valve cover 2, the cladding stainless steel 1102 is arranged inside the valve cover 2, the molded pile material 1103 is arranged inside the valve cover 2, and the contact surface of the valve body 1 and the valve cover 2 is spray-welded with WC hard alloy 1104.

[0026] The above scheme is adopted: when the valve stem 9 moves, the telescopic movement of the bellows 1101 and the close contact of the formed pile material 1103 work together to form a reliable sealing barrier, thereby improving the sealing performance of the valve, and enhancing the durability and reliability of the valve. In addition, WC hard alloy 1104 is spray-welded in the contact area between the valve body 1 and the valve cover 2 to enhance the overall wear resistance of the valve, effectively avoiding material damage caused by high-temperature operation, and the processing surface is made smoother by providing the cladding stainless steel 1102.

[0027] like Figures 1 to 4 , Figure 7 and Figure 8 As shown, the buffer mechanism 12 includes a servo motor 1201, a reciprocating screw 1202 and a first connecting block 1203. The servo motor 1201 is fixed at the bottom end of the valve cover 2, the reciprocating screw 1202 is fixed to the top end of the servo motor 1201, the outside of the reciprocating screw 1202 is provided with a first connecting block 1203, the outside of the first connecting block 1203 is fixed with a first buffer disk 1204, the outside of the reciprocating screw 1202 is provided with a second connecting block 1205, the outside of the reciprocating screw 1202 is provided with an external thread, the inside of the first connecting block 1203 and the second connecting block 1205 are provided with an internal thread, the reciprocating screw 1202 and the first connecting block 1203 are threadedly connected, and the reciprocating screw 1202 and the second connecting block 1205 are threadedly connected.

[0028] like Figures 1 to 4 , Figure 7 and Figure 8 As shown, a second buffer disk 1206 is fixed to the outside of the second connecting block 1205, a limiting disk 1207 is fixed to the top of the reciprocating screw 1202, the first buffer disk 1204 and the second buffer disk 1206 have the same shape, the first connecting block 1203 and the second connecting block 1205 are symmetrically distributed about the central axis of the valve cover 2, the diameter of the limiting disk 1207 is larger than the diameter of the reciprocating screw 1202, and the reciprocating screw 1202 and the valve cover 2 are movably connected.

[0029] The above scheme is adopted: by starting the servo motor 1201 to drive the first connecting block 1203 and the second connecting block 1205 to reciprocate, and then drive the first buffer plate 1204 and the second buffer plate 1206 to reciprocate, so that the first buffer plate 1204 and the second buffer plate 1206 can be in a spliced ​​state or an expanded state. In the spliced ​​state, when the ball 10 is in a closed state, the fluid will first contact the first buffer plate 1204 and the second buffer plate 1206 when passing through the inside of the valve, and the fluid will be diffused by the shape of the first buffer plate 1204 and the second buffer plate 1206, so that the fluid first contacts the inner wall of the valve cover 2 and then is transported, thereby reducing the pressure on the ball 10, and then improving the erosion resistance of the ball 10. When the fluid needs to be transported quickly, the first buffer plate 1204 and the second buffer plate 1206 are set to the expanded state, so that the fluid can pass quickly.

[0030] like Figures 1 to 4 and Figure 6 As shown, the compensation mechanism 13 includes a lower end cover 1301, a sleeve 1302 and a first return spring 1303. The lower end cover 1301 is arranged at the bottom end of the valve body 1, the sleeve 1302 is fixed to the top end of the lower end cover 1301, the first return spring 1303 is fixed to the bottom end inside the sleeve 1302, and the top end of the first return spring 1303 is provided with a compensation block 1304. A connecting hole is opened at the bottom end of the sphere 10, the diameter of the sleeve 1302 is equal to the diameter of the connecting hole, and the first return spring 1303 is used to squeeze the compensation block 1304 and keep it moving upward.

[0031] like Figures 1 to 4 and Figure 6 As shown, a limiting rod 1305 is provided at one end of the lower end cover 1301, and a mounting hole is opened inside the limiting rod 1305. The valve body 1 is internally movably connected to a limiting block 1306, and a third connecting block 1307 is fixed to the bottom end of the limiting block 1306. A second return spring 1308 is installed at one end of the limiting block 1306. Four groups of limiting rods 1305 are provided, and the limiting rods 1305 are evenly spaced about the central axis of the lower end cover 1301. Four groups of limiting blocks 1306 are provided, and the limiting blocks 1306 are evenly spaced about the central axis of the lower end cover 1301. The second return spring 1308 is used to squeeze the limiting block 1306 and keep it moving toward the sleeve 1302.

[0032] The above scheme is adopted: the compensation block 1304 is pushed upward by the first return spring 1303, so that the ball 10 first contacts the compensation block 1304, and then the compensation block 1304 is pushed upward by the restoring force of the first return spring 1303 to provide an upward return force for the ball 10, and a camera is arranged inside the sleeve 1302 to detect the size of the compensation block 1304 in real time. When the volume of the compensation block 1304 is consumed by friction, the third connecting block 1307 can be pulled to disconnect the limit block 1306 from the limit rod 1305, so that the lower end cover 1301 can be removed, the compensation block 1304 is supplemented and replaced, and the valve as a whole is inspected and repaired, and then the compensation block 1304 is installed. Since the ball 10 is sealed by components such as the bellows 1101 inside the valve body 1, the replacement operation of the compensation block 1304 will not affect the overall performance of the valve.

[0033] The working principle and use process of the present invention are as follows: the connecting disk 8 is rotated to drive the valve stem 9 to rotate through the gear box 7, and then the ball 10 is driven to rotate, so that the ball 10 can be changed to an open state or a closed state, thereby completing the delivery or cutoff of the substance. When the valve is opened, the inside of the bellows 1101 is compressed and expanded, thereby opening the valve, and when the valve is closed, the inside of the bellows 1101 returns to its original state, achieving a close fit between the valve body 1 and the valve cover 2, thereby achieving the sealing of the valve. When the valve stem 9 moves, the telescopic movement of the bellows 1101 and the close contact of the formed pile 1103 work together to form a reliable sealing barrier, thereby The sealing performance of the valve is improved, and the durability and reliability of the valve are also enhanced. WC hard alloy 1104 is spray-welded in the contact area between the valve body 1 and the valve cover 2 to enhance the wear resistance of the valve as a whole, effectively avoiding material damage caused by high-temperature operation. The surfacing stainless steel 1102 is provided to make the machined surface smoother. After the ball 10 is installed inside the valve body 1, it will always exert a downward force due to its own weight. After the ball 10 is in contact with the bottom of the valve body 1 for a long time, wear will occur, resulting in a slight deviation in the position of the ball 10 and leakage. The compensation block 1304 is moved upward by the first return spring 1303. The first return spring 1303 pushes the compensation block 1304 upwards to provide a force for the ball 10 to return upwards. A camera is provided inside the sleeve 1302 to detect the size of the compensation block 1304 in real time. When the volume of the compensation block 1304 is consumed by friction, the third connecting block 1307 can be pulled to separate the limit block 1306 from the limit rod 1305. The lower end cover 1301 is removed, the compensation block 1304 is supplemented and replaced, and the valve is repaired as a whole. Then the compensation block 1304 is installed. The interior of the valve body 1302 is sealed with components such as a bellows 1101, and the overall performance of the valve will not be affected when the compensation block 1304 is replaced, and the first buffer disk 1204 and the second buffer disk 1206 can be in a spliced ​​state or an expanded state. In the spliced ​​state, when the ball 10 is in a closed state, the fluid will first contact the first buffer disk 1204 and the second buffer disk 1206 when passing through the inside of the valve, and the shape of the first buffer disk 1204 and the second buffer disk 1206 will diffuse the fluid, so that the fluid first contacts the inner wall of the valve cover 2 and then is transported, thereby reducing the pressure on the ball 10 and thereby improving the erosion resistance of the ball 10.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hard-sealed wear-resistant and erosion-resistant ball valve, comprising a valve body (1), characterized in that: A valve cover (2) is installed on the outside of the valve body (1), a valve stem (9) is movably connected to the inside of the valve body (1), a ball (10) is fixed to the bottom end of the valve stem (9), a wear-resistant mechanism (11) is arranged inside the valve cover (2), a buffer mechanism (12) is installed inside the valve cover (2), a compensation mechanism (13) is installed at the bottom end of the valve body (1), a valve support seat (14) is fixed to the bottom end of the valve body (1), and a discharge port (15) is opened at one end of the valve cover (2); The wear-resistant mechanism (11) comprises a bellows (1101), cladding stainless steel (1102), a formed cladding material (1103) and WC hard alloy (1104); the bellows (1101) is installed inside the valve cover (2); the cladding stainless steel (1102) is arranged inside the valve cover (2); the formed cladding material (1103) is arranged inside the valve cover (2); and the contact surfaces of the valve body (1) and the valve cover (2) are spray-welded with WC hard alloy (1104).

2. The hard-sealed wear-resistant and erosion-resistant ball valve according to claim 1 is characterized in that: The buffer mechanism (12) comprises a servo motor (1201), a reciprocating screw (1202) and a first connecting block (1203); the servo motor (1201) is fixed to the bottom end of the valve cover (2); the reciprocating screw (1202) is fixed to the top end of the servo motor (1201); the first connecting block (1203) is arranged outside the reciprocating screw (1202); the first buffer disk (1204) is fixed to the outside of the first connecting block (1203); the second connecting block (1205) is arranged outside the reciprocating screw (1202); the second buffer disk (1206) is fixed to the outside of the second connecting block (1205); and the limit disk (1207) is fixed to the top end of the reciprocating screw (1202).

3. The hard-sealed wear-resistant and erosion-resistant ball valve according to claim 2 is characterized in that: The reciprocating screw rod (1202) is provided with an external thread on the outside, and the first connecting block (1203) and the second connecting block (1205) are provided with internal threads on the inside. The reciprocating screw rod (1202) and the first connecting block (1203) are threadedly connected, and the reciprocating screw rod (1202) and the second connecting block (1205) are threadedly connected.

4. The hard-sealed wear-resistant and erosion-resistant ball valve according to claim 2 is characterized in that: The first buffer disk (1204) and the second buffer disk (1206) have the same shape, the first connection block (1203) and the second connection block (1205) are symmetrically distributed about the central axis of the valve cover (2), the diameter of the limit disk (1207) is larger than the diameter of the reciprocating screw (1202), and the reciprocating screw (1202) and the valve cover (2) are movably connected.

5. The hard-sealed wear-resistant and erosion-resistant ball valve according to claim 1 is characterized in that: The compensation mechanism (13) comprises a lower end cover (1301), a sleeve (1302) and a first return spring (1303); the lower end cover (1301) is arranged at the bottom end of the valve body (1); the sleeve (1302) is fixed at the top end of the lower end cover (1301); the first return spring (1303) is fixed at the bottom end of the sleeve (1302); a compensation block (1304) is arranged at the top end of the first return spring (1303); a limit rod (1305) is arranged at one end of the lower end cover (1301); a mounting hole is provided inside the limit rod (1305); the limit block (1306) is movably connected to the inside of the valve body (1); a third connecting block (1307) is fixed at the bottom end of the limit block (1306); and a second return spring (1308) is installed at one end of the limit block (1306).

6. The hard-sealed wear-resistant and erosion-resistant ball valve according to claim 5, characterized in that: A connecting hole is provided at the bottom end of the sphere (10); the diameter of the sleeve (1302) is equal to the diameter of the connecting hole; and the first return spring (1303) is used to squeeze the compensation block (1304) and keep it moving upward.

7. The hard-sealed wear-resistant and erosion-resistant ball valve according to claim 5, characterized in that: The limiting rods (1305) are provided in four groups, and the limiting rods (1305) are distributed at equal intervals with respect to the central axis of the lower end cover (1301); the limiting blocks (1306) are provided in four groups, and the limiting blocks (1306) are distributed at equal intervals with respect to the central axis of the lower end cover (1301); and the second return spring (1308) is used to squeeze the limiting block (1306) and keep it moving toward the sleeve (1302).

8. The hard-sealed wear-resistant and erosion-resistant ball valve according to claim 1, characterized in that: A first fixing bolt (3) is arranged on the outside of the valve cover (2), a feed port (4) is opened at one end of the valve cover (2), an upper end cover (5) is installed at the top end of the valve body (1), a second fixing bolt (6) is arranged at the top end of the upper end cover (5), a gear box (7) is installed at the top end of the upper end cover (5), and a connecting plate (8) is installed at one end of the gear box (7).

9. The hard-sealed wear-resistant and erosion-resistant ball valve according to claim 8, characterized in that: The valve covers (2) are provided in two groups, and the valve covers (2) are symmetrically distributed about the central axis of the valve body (1); the first fixing bolts (3) are provided in a plurality of groups, and the first fixing bolts (3) are distributed at equal intervals about the central axis of the valve cover (2).

10. The hard-sealed wear-resistant and erosion-resistant ball valve according to claim 8, characterized in that: A plurality of groups of the second fixing bolts (6) are provided, and the second fixing bolts (6) are distributed at equal intervals about the central axis of the upper end cover (5). The output end of the gear box (7) is connected to a valve stem (9), and the valve stem (9) is movably connected to the interior of the upper end cover (5).

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