Safety valve grinding apparatus and method

Abstract

The embodiment of the present disclosure provides a safety valve grinding device and method, the safety valve comprises a valve seat and a valve core ball matched with the valve seat, the grinding device comprises: a guide sleeve with an open end and a closed end, the guide sleeve is used for sleeving outside the valve seat and rotating relative to the valve seat, the inner peripheral wall of the guide sleeve is in contact with the outer peripheral wall of the valve seat, and a recess is arranged on one side of the closed end towards the open end; a grinding ball fixed in the recess, the diameter of the grinding ball is consistent with the diameter of the valve core ball, and the grinding ball is used for being in contact with the sealing surface of the valve seat and the valve core ball and grinding the sealing surface. The embodiment of the present disclosure can effectively fix the valve seat and improve the stability and grinding efficiency during grinding by arranging the guide sleeve and the grinding ball.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the field of safety valve technology, specifically relating to a safety valve grinding device and method. Background Technology

[0002] The SEBIM pilot-operated safety valve is a widely used valve in nuclear power plants. It has a complex structure and compact assembly of components. The upper three-way component of the SEBIM pilot-operated safety valve mainly includes the valve seat and valve core ball. The valve core ball and valve seat work together to achieve a valve seal. The upper three-way valve seat and valve core ball are relatively small in size, and the effective sealing area is also small, making the sealing performance requirements extremely stringent. If the seal fails, it will cause leakage of radioactive media.

[0003] The upper tee component has a relatively small structural size; for example, the diameter of the valve core steel ball is only 9.5mm, and the diameter of the mating upper tee valve seat ring is only 6mm, resulting in an effective grinding allowance of only 0.5mm on the sealing surface. The upper tee component has high sealing requirements, necessitating grinding and repair during unit overhauls to ensure effective sealing. Grinding and repairing the upper tee component requires specialized grinding tools, typically grinding rods with a special grinding ball adhered to the top. The grinding rod rotates coaxially on the upper part of the valve seat. This operation method demands a high level of operator skill; improper operation can lead to excessive grinding or uneven grinding of the sealing surface, affecting the valve's sealing performance. Furthermore, the small structural size of the upper tee valve seat necessitates effective fixation; otherwise, the components may tip over during grinding, impacting grinding efficiency.

[0004] The existing technology has at least the following problems: (1) the parts cannot be effectively fixed during grinding, resulting in poor grinding stability; (2) the grinding operation requires a high level of grinding skills from the operator. Summary of the Invention

[0005] The embodiments disclosed herein are intended to at least address one of the technical problems existing in the prior art, and to provide a safety valve grinding apparatus and method.

[0006] On one hand, embodiments of this disclosure provide a safety valve grinding apparatus, the safety valve including a valve seat and a valve core ball cooperating with the valve seat, the grinding apparatus comprising:

[0007] A guide sleeve having an open end and a closed end, the guide sleeve being fitted onto the outside of the valve seat and rotating relative to the valve seat, the inner peripheral wall of the guide sleeve contacting the outer peripheral wall of the valve seat, and a recessed hole being provided on the side of the closed end facing the open end;

[0008] A grinding ball is fixed inside the recessed hole. The diameter of the grinding ball is the same as that of the valve core ball. It is used to contact the sealing surfaces of the valve seat and the valve core ball and grind the sealing surfaces.

[0009] Optionally, the grinding apparatus further includes a pressure cap;

[0010] The pressure cap is detachably disposed on the side of the closed end facing the open end, and is used to press and fix the grinding ball.

[0011] Optionally, the pressure cap has a crimping hole in its central region and mounting holes in its edge region;

[0012] The size of the crimping hole is matched with the size of the grinding ball to accommodate the crimping of the grinding ball;

[0013] The mounting holes are used to install fasteners to secure the gland.

[0014] Optionally, the contact surface between the crimping hole and the grinding ball is set as an inclined plane, which is tangent to the surface of the grinding ball.

[0015] Optionally, the diameter of the side of the crimping hole facing the opening end is set to three-fifths to four-fifths of the diameter of the grinding ball.

[0016] Optionally, the depth of the concave hole is greater than or equal to three-quarters of the diameter of the grinding ball and less than or equal to the diameter of the grinding ball.

[0017] Optionally, the valve seat includes a needle valve seat, with the open end of the guide sleeve exposing the pin of the needle valve seat.

[0018] Optionally, the grinding device may further include a clamping element;

[0019] The clamping member has a receiving hole at one end facing the pin for receiving the pin.

[0020] The clamping member is also provided with a fixing hole, which is used to install a fixing member to fix the pin in the receiving hole.

[0021] Optionally, the valve seat further includes a sleeve-shaped valve seat, and the open end of the guide sleeve protrudes from the sleeve-shaped valve seat; the grinding device further includes an extension rod;

[0022] One end of the extension rod is fixed inside the sleeve-shaped valve seat, and the other end extends out of the opening end of the guide sleeve and is configured as a square structure.

[0023] On the other hand, embodiments of this disclosure provide a safety valve grinding method using the grinding apparatus described above, the method comprising:

[0024] Assembly: The grinding ball is fixed in the concave hole, and the guide sleeve is sleeved on the outside of the valve seat, so that the inner peripheral wall of the guide sleeve contacts the outer peripheral wall of the valve seat, and the grinding ball contacts the sealing surface of the valve seat and the valve core ball;

[0025] Coarse grinding: The first abrasive material is applied to the sealing surface, the valve seat or the guide sleeve is rotated in the same direction and a first preset pressure is applied to it to grind the sealing surface through the abrasive ball;

[0026] Fine grinding: Clean the first grinding material and replace it with a new grinding ball. Cover the sealing surface with the second grinding material, rotate the valve seat or the guide sleeve in the same direction and apply a second preset pressure to grind the sealing surface through the grinding ball.

[0027] Fine grinding: Clean the second grinding material and replace it with a new grinding ball. Cover the sealing surface with the third grinding material, place the guide sleeve vertically with the open end of the guide sleeve facing the ground, and rotate the guide sleeve in the same direction so that the grinding ball grinds the sealing surface by its own weight and the pressure of the guide sleeve.

[0028] Polishing: Clean the third abrasive material and replace it with a new abrasive ball. Apply lubricant to the sealing surface. Place the guide sleeve vertically with the open end of the guide sleeve facing the ground. Rotate the guide sleeve quickly in the same direction so that the abrasive ball grinds the sealing surface by its own weight and the pressure of the guide sleeve.

[0029] The safety valve grinding apparatus and method of the present disclosure, through the provided guide sleeve and grinding ball, can effectively fix the valve seat and improve the stability and grinding efficiency during grinding. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a safety valve grinding device according to an embodiment of the present disclosure;

[0031] Figure 2 This is a schematic diagram of the structure of a needle valve seat according to an embodiment of the present disclosure;

[0032] Figure 3 This is a schematic diagram of the structure of a sleeve-shaped valve seat according to another embodiment of the present disclosure;

[0033] Figure 4 This is a schematic diagram illustrating the combination of a clamping member and a needle valve seat according to another embodiment of the present disclosure;

[0034] Figure 5This is a specific application diagram of a safety valve grinding device according to another embodiment of the present disclosure;

[0035] Figure 6 This is a specific application diagram of a safety valve grinding device according to another embodiment of the present disclosure;

[0036] Figure 7 This is a schematic flowchart of a safety valve grinding method according to another embodiment of the present disclosure. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figures 1 to 3 As shown, a safety valve grinding device 100 is disclosed. The safety valve includes a valve seat 200 and a valve core ball 300 that cooperates with the valve seat 200. The grinding device 100 includes a guide sleeve 110 and a grinding ball 120. The guide sleeve 110 has an open end 111 and a closed end 112. The guide sleeve 110 is used to fit around the outside of the valve seat 200 and rotate relative to the valve seat 200. The inner peripheral wall of the guide sleeve 110 contacts the outer peripheral wall of the valve seat 200. The closed end 112 has a recess 1121 on the side facing the open end 111. The grinding ball 120 is fixed in the recess 1121. The diameter of the grinding ball 120 is the same as the diameter of the valve core ball 300. It is used to contact the sealing surfaces of the valve seat 200 and the valve core ball 300 and to grind the sealing surfaces.

[0039] Specifically, such as Figures 1 to 3 As shown, the guide sleeve 110 has an open end 111 and a closed end 112. A recess 1121 is provided on the side of the closed end 112 facing the open end 111. A grinding ball 120 is fixed inside the recess 1121. The diameter of the grinding ball 120 is the same as the diameter of the valve core ball 300, and the size of the recess 1121 matches that of the grinding ball 120. The valve seat 200 is inserted through the open end of the guide sleeve 110. After the valve seat 200 is inserted into the guide sleeve 110, the outer peripheral wall of the valve seat 200 contacts the inner peripheral wall of the guide sleeve 110. The sealing surfaces of the valve seat 200 and the valve core ball 300 contact the grinding ball 120. At this time, relative rotation between the valve seat 200 and the guide sleeve 110 allows the sealing surfaces of the valve seat 200 and the valve core ball 300 to be ground by the grinding ball 120. Since the outer peripheral wall of the valve seat 200 contacts the inner peripheral wall of the guide sleeve 110, the guide sleeve 110 can guide and fix the valve seat 200. As a specific example, the dimensional deviation between the diameter of the grinding ball 120 and the diameter of the valve core ball 300 does not exceed 0.02mm.

[0040] like Figure 2 and Figure 3 As shown, the upper three-way valve seat of the safety valve is divided into a needle-shaped valve seat 210 and a sleeve-shaped valve seat 220, both of which are in contact with the valve core ball 300 to achieve sealing.

[0041] The safety valve grinding device of this disclosure, through the provided guide sleeve and grinding ball, can effectively fix the valve seat and improve the stability and grinding efficiency during grinding, and is relatively simple to use and operate.

[0042] For example, such as Figure 1 As shown, the grinding device 100 also includes a pressure cap 130. The pressure cap 130 is detachably disposed on the side of the closed end 112 facing the open end 111, and is used to press and fix the grinding ball 120.

[0043] Furthermore, the pressure cap 130 has a crimping hole 131 in its central region and mounting holes (not shown in the figure) in its edge region. The size of the crimping hole 131 matches the size of the grinding ball 120 to accommodate and crimp the grinding ball 120. The mounting holes are used to install fasteners 140 to fix the pressure cap 130.

[0044] Specifically, such as Figure 1 As shown, a cap 130, matching the shape of the cap 130, is detachably provided on the side of the closed end 112 facing the open end 111. A crimping hole 131 is provided in the central region of the cap 130, the size of which matches the size of the grinding ball 120, to accommodate and crimp the grinding ball 120, allowing the grinding ball 120 to protrude from the crimping hole 131. Multiple mounting holes are also provided on the edge region of the cap 130 for installing fasteners 140 to secure the cap 130. The fasteners 140 can be locking bolts; however, other fastening devices can also be used, and this embodiment does not limit this.

[0045] The safety valve grinding device of the present disclosure has a detachable cover that can be removed and installed at any time during grinding as needed, making it convenient to replace the grinding balls.

[0046] Furthermore, such as Figure 1 As shown, the contact surface between the crimping hole 131 and the grinding ball 120 is set as an inclined plane, which is tangent to the surface of the grinding ball 120. This arrangement can better fix and limit the grinding ball.

[0047] Furthermore, such as Figure 1As shown, the diameter of the side of the crimping hole 131 facing the opening end 111 is set to three-fifths to four-fifths of the diameter of the grinding ball 120. The depth of the concave hole 1121 is greater than or equal to three-quarters of the diameter of the grinding ball 120 and less than or equal to the diameter of the grinding ball 120.

[0048] Specifically, such as Figure 1 As shown, the diameter of the side of the crimping hole 131 facing the opening end 111 is set to three-fifths to four-fifths of the diameter of the grinding ball 120. As a specific example, the diameter of the side of the crimping hole 131 facing the opening end 111 is set to three-quarters of the diameter of the grinding ball 120, and the thickness of the gland 130 is set to 2mm to 3mm. The depth of the recess 1121 is set to be greater than or equal to three-quarters of the diameter of the grinding ball 120 and less than or equal to the diameter of the grinding ball 120. This setting allows the grinding ball to be more exposed in the crimping hole to contact the valve seat sealing surface, and to better fit the grinding ball against the valve seat sealing surface for grinding. This not only effectively avoids insufficient pressure on the grinding ball due to an excessively deep recess or an excessively thick gland, preventing the grinding ball from rotating during grinding, but also effectively avoids difficulty in fixing the grinding ball due to an excessively shallow recess or an excessively thin gland.

[0049] For example, such as Figure 1 , Figure 2 and Figure 4 As shown, the valve seat 200 includes a needle-shaped valve seat 210, and the open end 111 of the guide sleeve 110 exposes the pin 211 of the needle-shaped valve seat 210. The grinding device 100 also includes a clamping member 150. The clamping member 150 has a receiving hole 151 at one end facing the pin 211 for receiving the pin 211. The clamping member 150 also has a fixing hole (not shown in the figure), which is used to install a fixing member 152 to fix the pin 211 in the receiving hole 151.

[0050] Specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, the pin 211 of the needle valve seat 210 protrudes from the open end 111 of the guide sleeve 110, and the free end of the pin 211 is inserted into the receiving hole 151 of the clamping member 150. The fixing member 152 passes through the fixing hole to fix the pin 211 in the receiving hole 151. It should be noted that the fixing member 152 can be a bolt, or other fasteners with a fixing function besides bolts. This embodiment does not impose specific limitations on this.

[0051] The safety valve grinding device of this disclosure extends the pin shaft through the provided clamping member, making it easier to grip during grinding and more convenient to operate. As an example, the guide sleeve 110 is fixed, and during grinding, the clamping member 150 can be used as a handle. By gripping and rotating the clamping member 150, the needle valve seat 210 rotates within the guide sleeve 110, allowing the grinding ball 120 to grind the sealing surface. As another example, ... Figure 5 As shown, the clamping member 150 is clamped in the clamping tool 400, which can be a tool with clamping function such as a vise. Since the clamping member 150 is fixed by the clamping tool 400, the needle valve seat 210 fixed to the clamping member 150 is also fixed. Rotating the guide sleeve 110 causes the grinding ball 120 to grind the sealing surface. The above two examples can be selected according to actual needs, realizing the diversity of grinding operations.

[0052] For example, such as Figure 1 , Figure 3 and Figure 6 As shown, the valve seat 200 further includes a sleeve-shaped valve seat 220, and the open end 111 of the guide sleeve 110 protrudes from the sleeve-shaped valve seat 220. The grinding device 100 also includes an extension rod 160, one end of which is fixed inside the sleeve-shaped valve seat 220, and the other end extends out of the open end 111 of the guide sleeve 110 and is configured as a square structure.

[0053] Specifically, such as Figure 1 , Figure 3 and Figure 6 As shown, the open end 111 of the guide sleeve 110 protrudes from the sleeve-shaped valve seat 220. One end of the extension rod 160 is fixed inside the sleeve-shaped valve seat 220, and the other end extends out of the open end of the guide sleeve 110 and is configured as a square structure. More specifically, one end of the extension rod 160 is threaded to the sleeve-shaped valve seat 220, and the other end is configured as a square structure for easy gripping.

[0054] The safety valve grinding apparatus of this disclosure extends the sleeve-shaped valve seat 220 via an extension rod, allowing it to be gripped during grinding operations for convenience. As one example, the guide sleeve 110 is fixed in place. During grinding, the square structure extending from the opening of the guide sleeve 110 is gripped and rotated, thereby rotating the sleeve-shaped valve seat 220 within the guide sleeve 110, allowing the grinding ball 120 to grind the sealing surface. As another example, during grinding, the square structure extending from the opening of the guide sleeve 110 is gripped to fix the sleeve-shaped valve seat 220, and the guide sleeve 110 is rotated, allowing the grinding ball 120 to grind the sealing surface. These two examples can be selected according to actual needs, achieving versatility in grinding operations.

[0055] Another aspect of the embodiments of this disclosure, such as Figure 7 As shown, a method for grinding a safety valve is provided, using the grinding device 100 described above. The specific structure of the grinding device 100 can be found in the preceding descriptions and will not be elaborated upon here. The method includes:

[0056] Step S1: Inspection: Observe the appearance of the sealing surfaces of the valve seat and the valve core ball, checking the distribution of defects such as scratches, pits, and pinholes. If the depth of the defect on the sealing surface is greater than 0.2mm, it is not worthwhile to grind and repair, and the entire valve seat needs to be replaced. If the depth of the defect on the sealing surface is no more than 0.2mm, it can be ground and repaired, and the following operations can be performed.

[0057] Step S2, Assembly: Fix the grinding ball in the concave hole and put the guide sleeve on the outside of the valve seat, so that the inner peripheral wall of the guide sleeve contacts the outer peripheral wall of the valve seat, and the grinding ball contacts the sealing surface of the valve seat and the valve core ball.

[0058] Step S3, coarse grinding: Apply the first grinding material to the sealing surface, rotate the valve seat or the guide sleeve in the same direction and apply a first preset pressure to grind the sealing surface through the grinding ball.

[0059] As a specific example, in this step, apply W40 polishing paste to the sealing surface of the valve seat, rotate the valve seat or guide sleeve, and apply approximately 15N of pressure. Polish in the same direction. If you feel no gritty texture during polishing and the W40 polishing paste turns black, clean off the blackened paste and add new paste. After polishing for a period of time, inspect the appearance of the polishing balls. If obvious marks appear on the surface, adjust the orientation of the balls and continue polishing using the glossy side.

[0060] After grinding for a period of time using the rough grinding method in step S3, place the sealing surface of the valve seat under a microscope for observation. If the minor scratches, pits, and other defects have been eliminated and the external gloss of the sealing surface of the valve seat is uniform and grayish-black, then the rough grinding process can be stopped.

[0061] Step S4, fine grinding: Clean the first grinding material and replace it with a new grinding ball. Cover the sealing surface with the second grinding material, rotate the valve seat or the guide sleeve in the same direction and apply a second preset pressure to grind the sealing surface through the grinding ball.

[0062] As a specific example, in this step, replace the grinding balls with new ones during fine grinding, and clean off the W40 grinding paste used during coarse grinding. Apply W20 grinding paste to the sealing surface of the valve seat, rotate the valve seat or guide sleeve, and apply approximately 10N of pressure. Grind in the same direction. If you feel no gritty texture during grinding and the W20 grinding paste turns black, clean off the blackened W20 grinding paste and add new W20 grinding paste. After grinding for a period of time, inspect the appearance of the grinding balls. If obvious marks appear on the surface of the grinding balls, adjust the orientation of the grinding balls and continue grinding using the glossy side.

[0063] After grinding for a period of time using the fine grinding method in step S4, place the sealing surface of the valve seat under a microscope for observation. Conduct a comprehensive inspection of the sealing surface of the valve seat. If the sealing surface is basically bright, the surface gloss is basically consistent, and there is no local darkening, then the fine grinding process can be stopped.

[0064] Step S5, Fine Grinding: Clean the second grinding material and replace it with a new grinding ball. Cover the sealing surface with the third grinding material, place the guide sleeve vertically with the open end of the guide sleeve facing the ground, and rotate the guide sleeve in the same direction so that the grinding ball grinds the sealing surface by its own weight pressure with the guide sleeve.

[0065] As a specific example, in this step, replace the grinding balls during fine grinding and clean off the W20 grinding paste used during fine grinding. Apply W7 grinding paste to the sealing surface of the valve seat. During fine grinding, place the guide sleeve vertically with its open end facing the ground and fix the valve seat in place. At this time, the open end of the guide sleeve is close to the ground and the grinding balls are far from the ground. Rotate the guide sleeve; no additional pressure is needed during rotation, relying solely on the weight of the grinding balls and the guide sleeve to grind the sealing surface. Grind in the same direction. If you feel no gritty texture during grinding and the W7 grinding paste turns black, clean off the blackened W7 grinding paste and add new W7 grinding paste. After grinding for a period of time, inspect the appearance of the grinding balls. If obvious marks appear on the surface of the grinding balls, adjust the orientation of the grinding balls and continue grinding using the glossy side.

[0066] After grinding for a period of time according to the fine grinding method in step S5, place the sealing surface of the valve seat under a microscope for observation and conduct a comprehensive inspection of the sealing surface of the valve seat. If the sealing surface is bright, the surface gloss is completely consistent, and there is no local darkening, then the fine grinding process can be stopped.

[0067] Step S6, Polishing: Clean the third abrasive material and replace it with a new abrasive ball. Apply lubricant to the sealing surface, place the guide sleeve vertically with the open end of the guide sleeve facing the ground, and rotate the guide sleeve quickly in the same direction so that the abrasive ball grinds the sealing surface by its own weight pressure with the guide sleeve.

[0068] As a specific example, in this step, replace the polishing ball with a new one and clean off the W7 polishing paste used during fine grinding. Add lubricating oil between the valve seat and the polishing ball. During polishing, place the guide sleeve vertically with its open end facing the ground and fix the valve seat in place. At this point, the open end of the guide sleeve is close to the ground, and the polishing ball is far from the ground. Rotate the guide sleeve quickly; no additional pressure is needed during rotation, relying solely on the weight of the polishing ball and the guide sleeve to polish the sealing surface. Grind in the same direction for a certain period, then add appropriate lubricating oil again, observing the color of the lubricating oil during the grinding process. If the color of the lubricating oil remains unchanged, polishing is complete. As an example, the rotation speed of the guide sleeve during rapid rotation can be set to 35 rpm to 45 rpm, more specifically, 40 rpm.

[0069] The safety valve grinding method of the present disclosure can effectively fix the valve seat and improve the stability and grinding efficiency during grinding. It can also effectively grind and repair the valve seat, and effectively control the number of grinding reworks by setting grinding and repair standards.

[0070] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A safety valve grinding device, the safety valve comprising a valve seat and a valve core ball cooperating with the valve seat, characterized in that, The grinding apparatus includes: A guide sleeve having an open end and a closed end, the guide sleeve being fitted onto the outside of the valve seat and rotating relative to the valve seat, the inner peripheral wall of the guide sleeve contacting the outer peripheral wall of the valve seat, and a recessed hole being provided on the side of the closed end facing the open end; A grinding ball is fixed inside the recessed hole. The diameter of the grinding ball is the same as that of the valve core ball. It is used to contact the sealing surfaces of the valve seat and the valve core ball and grind the sealing surfaces.

2. The safety valve grinding device according to claim 1, characterized in that, The grinding device also includes a pressure cap; The pressure cap is detachably disposed on the side of the closed end facing the open end, and is used to press and fix the grinding ball.

3. The safety valve grinding device according to claim 2, characterized in that, The pressure cap has a crimping hole in its central area and mounting holes in its edge area; The size of the crimping hole is matched with the size of the grinding ball to accommodate the crimping of the grinding ball; The mounting holes are used to install fasteners to secure the gland.

4. The safety valve grinding device according to claim 3, characterized in that, The contact surface between the crimping hole and the grinding ball is set as an inclined plane, and the inclined plane can be tangent to the surface of the grinding ball.

5. The safety valve grinding device according to claim 4, characterized in that, The diameter of the side of the crimping hole facing the opening end is set to three-fifths to four-fifths of the diameter of the grinding ball.

6. The safety valve grinding apparatus according to any one of claims 1 to 5, characterized in that, The depth of the concave hole is greater than or equal to three-quarters of the diameter of the grinding ball and less than or equal to the diameter of the grinding ball.

7. The safety valve grinding apparatus according to any one of claims 1 to 5, characterized in that, The valve seat includes a needle-shaped valve seat, and the open end of the guide sleeve exposes the pin of the needle-shaped valve seat.

8. The safety valve grinding device according to claim 7, characterized in that, The grinding device also includes a clamping component; The clamping member has a receiving hole at one end facing the pin for receiving the pin. The clamping member is also provided with a fixing hole, which is used to install a fixing member to fix the pin in the receiving hole.

9. The safety valve grinding apparatus according to any one of claims 1 to 5, characterized in that, The valve seat also includes a sleeve-shaped valve seat, and the open end of the guide sleeve protrudes from the sleeve-shaped valve seat; the grinding device also includes an extension rod; One end of the extension rod is fixed inside the sleeve-shaped valve seat, and the other end extends out of the opening end of the guide sleeve and is configured as a square structure.

10. A method for grinding a safety valve, characterized in that, The method, using the grinding apparatus according to any one of claims 1 to 9, comprises: Assembly: The grinding ball is fixed in the concave hole, and the guide sleeve is sleeved on the outside of the valve seat, so that the inner peripheral wall of the guide sleeve contacts the outer peripheral wall of the valve seat, and the grinding ball contacts the sealing surface of the valve seat and the valve core ball; Coarse grinding: The first abrasive material is applied to the sealing surface, the valve seat or the guide sleeve is rotated in the same direction and a first preset pressure is applied to it to grind the sealing surface through the abrasive ball; Fine grinding: Clean the first grinding material and replace it with a new grinding ball. Cover the sealing surface with the second grinding material, rotate the valve seat or the guide sleeve in the same direction and apply a second preset pressure to grind the sealing surface through the grinding ball. Fine grinding: Clean the second grinding material and replace it with a new grinding ball. Cover the sealing surface with the third grinding material, place the guide sleeve vertically with the open end of the guide sleeve facing the ground, and rotate the guide sleeve in the same direction so that the grinding ball grinds the sealing surface by its own weight and the pressure of the guide sleeve. Polishing: Clean the third abrasive material and replace it with a new abrasive ball. Apply lubricant to the sealing surface. Place the guide sleeve vertically with the open end of the guide sleeve facing the ground. Rotate the guide sleeve quickly in the same direction so that the abrasive ball grinds the sealing surface by its own weight and the pressure of the guide sleeve.

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