Safety valve for chemical industry

Abstract

The utility model discloses a chemical safety valve which comprises a valve body, a valve cover is fixedly arranged at the upper end of the valve body through a bolt, a valve cavity is formed in the valve body, a valve element is arranged in the valve cavity, protective grids are arranged outside the valve body and the valve cover in a sleeved mode, the lower end of the valve cavity is provided with an inflow channel in a communicated mode, and an outflow channel is arranged on one side of the inflow channel. A pressure relief channel is formed in one side of the valve cavity, a baffle is arranged in the pressure relief channel, a circulation opening is formed in the center of the baffle, check plates are arranged on the sides, away from the valve element, of the baffles, a resistance structure is arranged between the upper ends of the check plates and the upper ends of the baffles, and an elastic pressure adjusting structure is arranged at the upper end of the valve element. Buffer parts are arranged on two sides of the upper end of the valve core in the valve cover; the safety valve can be effectively prevented from bursting, medium leakage can be effectively prevented, and the safety valve is safer to use.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of safety valve, more specifically relates to the safety valve for chemical industry. BACKGROUND

[0002] Safety valve is the closing piece under the action of external force and is in the normally closed state, when the medium fluid pressure in the equipment or pipeline rises above the specified value, the special valve is discharged to the system outside the medium fluid to prevent the medium pressure in the pipeline or equipment from exceeding the specified value, the safety valve belongs to the automatic valve, and the control pressure does not exceed the specified value, but there are some defects in the use process of the safety valve, and the fragments cannot be prevented from splashing after bursting, which can threaten the personal safety of the staff.

[0003] The prior art discloses a kind of safety valve for chemical industry with anti-bursting, by the setting of protective grid, the burst of safety valve or the burst of fragment can be effectively prevented from splashing and causing pipeline damage, the problem of safety valve burst is avoided;But, the utility model still has the following problems: only by the protective grid to prevent splashing after bursting, but the problem of safety valve burst cannot be solved, spring pressure cannot be adjusted, safety valve cannot be adjusted according to the demand of medium, and safety valve burst is easily caused, medium backflow in pressure relief process can cause internal pressure to be too large, and safety valve burst is easily caused, and valve core moves up and down and collides with valve seat, which can cause damage, thereby causing medium leakage, therefore, the utility model provides safety valve for chemical industry. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing safety valve for chemical industry, which can effectively prevent safety valve from bursting and effectively prevent medium leakage, and is safer when used.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] Safety valve for chemical industry, including valve body, the valve body upper end is equipped with valve cover by bolt fixing, the valve body is equipped with valve cavity, the valve cavity is equipped with valve core, the valve body and the valve cover are equipped with protective grid, the valve cavity lower end is communicated and is equipped with inflow channel, the inflow channel one side is equipped with outflow channel, the valve cavity one side is equipped with pressure relief channel, the pressure relief channel inner baffle, the baffle center is equipped with flow pass, the baffle side away from the valve core is equipped with check plate, the check plate upper end and the baffle upper end between are equipped with resistance structure, the valve core upper end is equipped with elastic pressure regulating structure, the valve cover is located in the valve core upper end both sides and is equipped with buffer.

[0007] By adopting the above technical scheme, the utility model has the following advantages:

[0008] The utility model discloses a protective grid's setting, when safety valve accidental burst, protective grid can effectively prevent the splinter to splash, and safety valve is more safe when using, the utility model discloses a check plate and the setting of resistance structure, when medium pressure relief, can overcome the resistance of resistance structure and make check plate open and realize pressure relief, when medium stops pressure relief, resistance structure can drive check plate reset, can effectively prevent medium backflow, prevent the influence to internal pressure, can effectively prevent safety valve burst, the utility model discloses the setting of elastic pressure regulating structure, makes safety valve can adjust pressure according to the demand of medium, thereby effectively preventing safety valve burst, the utility model discloses the setting of buffer portion, can play the role of buffering valve core down -shift impact force, thereby plays the role of protecting valve core and valve seat, can effectively prevent its damage, prevents medium leakage.

[0009] Further, the resistance structure includes a rotating shaft and a limiting torsion spring, the base plate is fixedly arranged on both sides of the upper end of the baffle plate, the extending portion is fixedly arranged on the upper end of the check plate, the rotating shaft is fixedly arranged on both sides of the extending portion, and the rotating shaft is rotatably connected with the corresponding base plate.

[0010] By adopting the above technical scheme, the utility model has the following advantages:

[0011] The limiting torsion spring is arranged, so that when pressure relief, the elasticity of the limiting torsion spring is overcome, thereby making the check plate open and the medium can flow out, and after pressure relief, the elasticity of the limiting torsion spring pushes the check plate to reset, and the medium backflow can be effectively prevented.

[0012] Further, the elastic pressure regulating structure includes a moving plate, a threaded column and a pressure regulating spring, the clamping plate is fixedly arranged on both ends of the pressure regulating spring, the clamping groove is arranged on the lower end of the moving plate and the upper end of the valve core, and the clamping plate is clamped in the corresponding clamping groove and fixedly connected.

[0013] By adopting the above technical scheme, the utility model has the following advantages:

[0014] The moving plate and the pressure regulating spring are arranged, so that when the moving plate moves downward, the pressure regulating spring can be squeezed, thereby changing the pressure of the upward movement of the valve core, and the pressure requirement of the medium can be used.

[0015] Further, the sliding block is arranged on both sides of the moving plate, the sliding groove is arranged on both ends of the inner side of the valve cover and corresponds to the position of the sliding block, and the sliding block is clamped in the corresponding sliding groove and can move up and down.

[0016] By adopting the above technical scheme, the utility model has the following advantages:

[0017] The sliding block and the sliding groove are arranged, so that the moving plate can only move up and down.

[0018] Further, the upper end of the moving plate is rotationally connected with one end of the threaded column, the other end of the threaded column is fixedly connected with the adjusting handle through the upper end of the valve cover, and the threaded column is threadedly connected with the valve cover.

[0019] By adopting the above technical scheme, the utility model has the following advantages:

[0020] The adjusting handle is arranged, so that rotation of the adjusting handle can drive the threaded column to rotate, thereby pushing the moving plate to move up and down.

[0021] Further, the buffer part comprises a supporting plate, a fixed column and a moving column, the supporting plate is fixedly connected with one side in the valve cover respectively, the fixed column is fixedly arranged on the lower end of the supporting plate close to one side of the valve core, the moving block one is arranged in the fixed column through the elastic part, the lower end of the moving block one is fixedly provided with a T-shaped block, the upper end of the moving column is provided with a T-shaped groove, the T-shaped block is clamped in the corresponding T-shaped groove and can move horizontally, the moving block two is arranged on the side of the moving column close to the valve core through the elastic part, the upper end surface of the moving block two is an inclined surface, the adjusting block is fixedly arranged on the side of the moving column away from the valve core, the upper end surface of the adjusting block is an inclined surface, the adjusting column is fixedly arranged on the lower end of the supporting plate corresponding to the position of the adjusting block, and the buffer plates are fixedly arranged on the lower end of the moving block two on both sides of the valve core.

[0022] By adopting the above technical scheme, the utility model has the following advantages:

[0023] The moving column and the moving block two are arranged, so that when the valve core moves downward, the buffer plate can abut against the inclined surface of the moving block two, the moving block two can be extruded to move to the embedded groove of the moving column, and the impact force of the downward movement of the valve core can be buffered.

[0024] Further, the elastic part comprises a spring one and a limiting block, the embedded groove is arranged on the lower end of the fixed column and one side of the moving column respectively, the spring one is fixedly arranged in the embedded groove, one end of the spring one away from the embedded groove is fixedly connected with the corresponding moving block one and moving block two respectively, the limiting block is fixedly arranged on both ends of the side of the moving block one and the moving block two close to the spring one, the limiting groove is communicated with the position of the embedded groove corresponding to the limiting block, and the limiting block is clamped in the corresponding limiting groove.

[0025] By adopting the above technical scheme, the utility model has the following advantages:

[0026] The spring one is arranged, so that when the moving block one and the moving block two are extruded, the moving block one and the moving block two can move to the corresponding embedded groove, and when the moving block one and the moving block two are not extruded, the moving block one and the moving block two can automatically reset.

[0027] Furthermore, a plurality of annular grooves are provided on the side where the valve core contacts the valve body, and a sealing ring 1 is fixedly provided in each of the annular grooves. A plurality of spring grooves are provided in the annular grooves, and a spring 2 is fixed in each of the spring grooves. The spring 2 is in contact with the sealing ring 1 on one side, and the sealing ring 1 is in contact with the valve body on the other side.

[0028] By adopting the above technical solution, the utility model has the following advantages:

[0029] The arrangement of the sealing ring 1 and the spring 2 of the utility model strengthens the sealing performance between the valve core and the valve body, and can effectively prevent the leakage of the medium.

[0030] Furthermore, a valve seat is fixedly provided at a position at the lower end of the valve core in the valve body, a sealing ring groove is provided at the upper end of the valve seat, a plurality of bottom grooves are provided in the sealing ring groove, a sealing ring 2 is fixedly provided in the sealing ring groove, a spring 3 is fixedly provided in each of the bottom grooves, the spring 3 is abutted against one side of the sealing ring 2, and the other side of the sealing ring 2 is abutted against the valve core.

[0031] By adopting the above technical solution, the utility model has the following advantages:

[0032] The arrangement of the sealing ring 2 and the spring 3 of the utility model strengthens the sealing performance between the valve core and the valve seat, and can effectively prevent the leakage of the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Figure 1 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0035] Figure 2 This is a schematic diagram of the structure of the utility model;

[0036] Figure 3 This is a schematic diagram of the structure of the baffle and check plate of the utility model;

[0037] Figure 4 For this utility model Figure 1 A in the middle is an enlarged structural diagram;

[0038] Figure 5 For this utility model Figure 1 Enlarged structural diagram at point B in the middle.

[0039] : 1, valve body; 101, valve cavity; 102, inflow channel; 103, outflow channel; 104, pressure relief channel; 2, valve seat; 201, sealing ring groove; 202, bottom groove; 3, valve core; 301, annular groove; 302, spring groove; 303, buffer plate; 4, baffle; 401, base plate; 402, flow-through opening; 5, check plate; 501, extension; 6, valve cover; 601, sliding groove; 7, moving plate; 701, sliding block; 8, pressure regulating spring; 801, clamping plate; 9, threaded column; 901, adjusting handle; 10, clamping groove; 11, sealing ring I; 12, spring II; 13, sealing ring II; 14, spring III; 15, support plate; 16, adjusting column; 17, fixed column; 18, moving block I; 19, T-shaped groove; 20, T-shaped block; 21, moving column; 22, adjusting block; 23, moving block II; 24, limiting block; 25, limiting groove; 26, spring I; 27, embedded groove; 28, rotating shaft; 29, limiting torsional spring; 30, protective grid. DETAILED DESCRIPTION

[0040] As Figures 1-2 shown, in the specific embodiment, the safety valve for chemical industry comprises a valve body 1, a valve cover 6 is fixed on the upper end of the valve body 1 through bolts, a valve cavity 101 is arranged in the valve body 1, a valve core 3 is arranged in the valve cavity 101, a protective grid 30 is arranged on the valve body 1 and the valve cover 6, an inflow channel 102 is arranged in the lower end of the valve cavity 101, an outflow channel 103 is arranged on one side of the inflow channel 102, a pressure relief channel 104 is arranged on one side of the valve cavity 101, a baffle 4 is arranged in the pressure relief channel 104, a flow-through opening 402 is arranged in the center of the baffle 4, check plates 5 are arranged on the side of the baffle 4 away from the valve core 3, a resistance structure is arranged between the upper end of the check plate 5 and the upper end of the baffle 4, an elastic pressure regulating structure is arranged on the upper end of the valve core 3, and buffer parts are arranged in the valve cover 6 on both sides of the upper end of the valve core 3.

[0041] Through the above arrangement, the protective grid 30 is arranged, when the safety valve accidentally bursts, the protective grid 30 can effectively prevent the fragments from splashing, and the safety valve is safer when used; the check plate 5 and the resistance structure are arranged, when the medium is pressure relieved, the resistance structure can overcome the resistance to make the check plate 5 open to realize pressure relief, when the medium stops pressure relief, the resistance structure can drive the check plate 5 to reset, can effectively prevent the medium from flowing back, can prevent the influence on the internal pressure, and can effectively prevent the safety valve from bursting; the elastic pressure regulating structure is arranged, the safety valve can regulate the pressure according to the demand of the medium, thereby effectively preventing the safety valve from bursting; the buffer parts are arranged, can play the role of buffering the impact force when the valve core 3 moves downward, thereby playing the role of protecting the valve core 3 and the valve seat 2, can effectively prevent damage and prevent the medium from leaking.

[0042] As Figure 1 and Figure 3As shown, the resistance structure includes the rotating shaft 28 and the limiting torsion spring 29, the baffle 4 is fixed with the base plate 401 on both sides of the upper end of the side close to the check plate 5, the check plate 5 is fixed with the extension 501 on the upper end, the extension 501 is fixed with the rotating shaft 28 on both sides, the rotating shaft 28 is rotatably connected with the corresponding base plate 401 respectively, and the limiting torsion spring 29 is located between the base plate 401 and the extension 501; the elastic pressure regulating structure includes the moving plate 7, the threaded column 9 and the pressure regulating spring 8, the pressure regulating spring 8 is fixed with the clamping plate 801 on both ends, the moving plate 7 is provided with the clamping groove 10 on the lower end and the upper end of the valve core 3, and the clamping plate 801 is clamped in the corresponding clamping groove 10 and fixedly connected; the moving plate 7 is provided with the sliding block 701 on both sides, the valve cover 6 is provided with the sliding groove 601 on both ends corresponding to the position of the sliding block 701, and the sliding block 701 is clamped in the corresponding sliding groove 601 and can move up and down; the moving plate 7 is rotatably connected with one end of the threaded column 9 on the upper end, the other end of the threaded column 9 penetrates through the upper end of the valve cover 6 and is fixedly connected with the adjusting handle 901, and the threaded column 9 is screwedly connected with the valve cover 6.

[0043] Through the above setting, the limiting torsion spring 29 is arranged, so that when the pressure is released, the elasticity of the limiting torsion spring 29 will be overcome, so that the check plate 5 is opened and the medium can flow out, and after the pressure is released, the elasticity of the limiting torsion spring 29 will push the check plate 5 back to the original position, so that the medium backflow can be effectively prevented; the moving plate 7 and the pressure regulating spring 8 are arranged, so that when the moving plate 7 moves down, the pressure regulating spring 8 can be squeezed, so that the pressure of the valve core 3 moving up is changed, so that the pressure demand of the medium can be used; the sliding block 701 and the sliding groove 601 are arranged, so that the moving plate 7 can only move up and down; the adjusting handle 901 is arranged, so that the rotation can drive the threaded column 9 to rotate, so that the moving plate 7 is pushed to move up and down.

[0044] As Figure 1 , Figure 4 and Figure 5The buffer part comprises support plates 15, fixing columns 17 and moving columns 21, the support plates 15 are fixedly connected with one side in the valve cover 6 respectively, the lower end of the support plate 15 is fixedly provided with the fixing column 17 close to one side of the valve core 3, the moving block one 18 is provided in the fixing column 17 through the elastic part, the lower end of the moving block one 18 is fixedly provided with a T-shaped block 20, the upper end of the moving column 21 is provided with a T-shaped groove 19, the T-shaped block 20 is clamped in the corresponding T-shaped groove 19 and can move horizontally, the moving column 21 is provided with the moving block two 23 through the elastic part close to one side of the valve core 3, the upper end surface of the moving block two 23 is an inclined surface, the moving column 21 is fixedly provided with the adjusting block 22 away from one side of the valve core 3, the upper end surface of the adjusting block 22 is an inclined surface, the adjusting column 16 is fixedly provided at the position corresponding to the adjusting block 22 at the lower end of the support plate 15, the buffer plates 303 are fixedly provided at the lower end of the moving block two 23 on both sides of the valve core 3; the elastic part comprises springs one 26 and limiting blocks 24, the lower end of the fixing column 17 and one side of the moving column 21 are provided with embedded grooves 27, the springs one 26 are fixedly provided in the embedded grooves 27, the ends of the springs one 26 away from the embedded grooves 27 are fixedly connected with the corresponding moving block one 18 and moving block two 23 respectively, the limiting blocks 24 are fixedly provided at both ends of one side of the moving block one 18 and the moving block two 23 close to the springs one 26, the limiting grooves 25 are provided in communication at the positions corresponding to the limiting blocks 24 in the embedded grooves 27, and the limiting blocks 24 are clamped in the corresponding limiting grooves 25; the side, in contact with the valve body 1, of the valve core 3 is provided with a plurality of annular grooves 301, the annular grooves 301 are fixedly provided with sealing rings one 11, the annular grooves 301 are provided with a plurality of spring grooves 302 in communication, the spring grooves 302 are fixedly provided with springs two 12, the springs two 12 abut one side of the sealing rings one 11, and the other side of the sealing rings one 11 abuts the valve body 1; the valve seat 2 is fixedly provided at the position, in the valve body 1, corresponding to the lower end of the valve core 3, the upper end of the valve seat 2 is provided with a sealing ring groove 201, the sealing ring groove 201 is provided with a plurality of bottom grooves 202 in communication, the sealing ring groove 201 is fixedly provided with sealing rings two 13, and the bottom grooves 202 are fixedly provided with springs three 14, the springs three 14 abut one side of the sealing rings two 13, and the other side of the sealing rings two 13 abuts the valve core 3.

[0045] Through the above setting, the moving column 21 and the moving block two 23 are arranged, so that when the valve core 3 moves downward, the buffer plate 303 can abut the inclined surface of the moving block two 23, and the moving block two 23 can be extruded to move to the embedded groove 27 of the moving column 21, thereby buffering the impact force when the valve core 3 moves downward; the spring one 26 is arranged, so that the moving block one 18 and the moving block two 23 can move to the corresponding embedded groove 27 when being extruded, and can automatically reset when not being extruded; the sealing ring one 11 and the spring two 12 are arranged, so that the sealing property between the valve core 3 and the valve body 1 is improved, and medium leakage can be effectively prevented; the sealing ring two 13 and the spring three 14 are arranged, so that the sealing property between the valve core 3 and the valve seat 2 is improved, and medium leakage can be effectively prevented.

[0046] Working principle: in use, according to the pressure requirement, rotate the adjusting handle 901, drive the threaded column 9 to rotate and move downwards, make the moving plate 7 move downwards and extrude the pressure regulating spring 8, thereby change the pressure of the valve core 3 moving upwards, so that it can use the pressure requirement of medium, can effectively prevent the burst of safety valve, when the medium flows from the inflow channel 102 to the outflow channel 103, when the pressure in the valve body 1 is too large, the medium will extrude the valve core 3 to move upwards, when the valve core 3 moves upwards, the buffer plate 303 will be in abutment with the moving block two 23, thereby driving the moving block two 23 to move upwards, so that the moving block one 18 is extruded into the embedded groove 27, at this time, the inclined surface of the adjusting block 22 is in abutment with the adjusting column 16, thereby driving the moving column 21 to move towards the adjusting column 16, so that the moving block two 23 is separated from the buffer plate 303, so that the valve core 3 can move upwards, too much medium will be discharged through the pressure relief channel 104, in the process of discharging, the check plate 5 will be extruded, at this time, the elastic force of the limiting torsional spring 29 will be overcome, thereby making the check plate 5 open, so that the medium can flow out, after pressure relief, the elastic force of the limiting torsional spring 29 will push the check plate 5 back to the original position, which can effectively prevent the backflow of medium, so that it will not affect the pressure in the valve body 1, can effectively prevent the burst of safety valve, when the pressure is normal after pressure relief, the valve core 3 moves downwards, the buffer plate 303 is in abutment with the inclined surface of the moving block two 23, slowly driving the moving block two 23 to extrude into the embedded groove 27, thereby playing the role of buffering the impact force of the valve core 3 moving downwards, making the valve core 3 and the valve seat 2 reduce the collision, so that it is not easy to be damaged, when the safety valve bursts accidentally, the protective grid 30 can effectively prevent the splashing of debris, the safety valve is safer in use; the protective grid 30, the threaded column 9, the spring one 26, the spring two 12, the spring three 14, the limiting torsional spring 29 and the pressure regulating spring 8 are all disclosed in the prior art, therefore, the application will not be described in detail.

[0047] The preferred embodiments of the utility model are described above, the protection scope of the utility model is not limited to the above-mentioned embodiments only, any technical scheme belonging to the utility model idea is within the protection scope of the utility model. It should be noted that, for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the utility model can also be considered as the protection scope of the utility model.

Claims

1. A safety valve for chemical industry, comprising a valve body (1), a valve cover (6) is fixed on the upper end of the valve body (1) by bolts, a valve cavity (101) is arranged in the valve body (1), a valve core (3) is arranged in the valve cavity (101), characterized in that, The valve body (1) and the valve cover (6) are provided with a protective grid (30), the lower end of the valve cavity (101) is provided with an inflow channel (102), one side of the inflow channel (102) is provided with an outflow channel (103), one side of the valve cavity (101) is provided with a pressure relief channel (104), the pressure relief channel (104) is provided with a baffle (4), the center of the baffle (4) is provided with a flow port (402), the side of the baffle (4) away from the valve core (3) is provided with a check plate (5), the upper end of the check plate (5) and the upper end of the baffle (4) are provided with a resistance structure, the upper end of the valve core (3) is provided with an elastic pressure regulating structure, and the valve cover (6) is provided with a buffer on both sides of the upper end of the valve core (3).

2. The safety valve for chemical industry according to claim 1, characterized in that, The resistance structure includes a rotating shaft (28) and a limiting torsional spring (29), the baffle (4) is fixedly provided with a base plate (401) on both sides of the upper end of one side close to the check plate (5), the check plate (5) is fixedly provided with an extension (501) on the upper end, the extension (501) is fixedly provided with the rotating shaft (28) on both sides, and the rotating shaft (28) is rotatably connected with the corresponding base plate (401). The limiting torsional spring (29) is located between the base plate (401) and the extension (501).

3. The safety valve for chemical industry according to claim 1, characterized in that, The elastic pressure regulating structure includes a moving plate (7), a threaded column (9) and a pressure regulating spring (8), the pressure regulating spring (8) is fixedly provided with a clamping plate (801) at both ends, the moving plate (7) is provided with a clamping groove (10) at the lower end and the upper end of the valve core (3), and the clamping plate (801) is clamped in the corresponding clamping groove (10) and fixedly connected.

4. The safety valve for chemical industry according to claim 3, characterized in that, Both sides of the moving plate (7) are provided with a sliding block (701), and both ends of the inner side of the valve cover (6) are provided with a sliding groove (601) corresponding to the position of the sliding block (701). The sliding block (701) is clamped in the corresponding sliding groove (601) and can move up and down.

5. The safety valve for chemical industry according to claim 4, characterized in that, The upper end of the moving plate (7) is rotatably connected with one end of the threaded column (9), the other end of the threaded column (9) penetrates through the upper end of the valve cover (6) and is fixedly connected with an adjusting handle (901), and the threaded column (9) is screwedly connected with the valve cover (6).

6. The safety valve for chemical industry according to claim 1, characterized by The buffer part includes support plates (15), fixed columns (17), and moving columns (21), the support plates (15) are fixedly connected with one side in the valve cover (6) respectively, the lower end of the support plate (15) is fixedly provided with a fixed column (17) close to one side of the valve core (3), the fixed column (17) is provided with a moving block (18) through an elastic part, the lower end of the moving block (18) is fixedly provided with a T-shaped block (20), the upper end of the moving column (21) is provided with a T-shaped groove (19), the T-shaped block (20) is clamped in the corresponding T-shaped groove (19) and can move horizontally, the moving column (21) is provided with a moving block (23) through an elastic part close to one side of the valve core (3), the upper end surface of the moving block (23) is an inclined surface, the moving column (21) is fixedly provided with an adjusting block (22) away from one side of the valve core (3), the upper end surface of the adjusting block (22) is an inclined surface, the lower end of the support plate (15) is fixedly provided with an adjusting column (16) corresponding to the position of the adjusting block (22), and the buffer plates (303) are fixedly arranged at the lower end of the moving block (23) on both sides of the valve core (3).

7. The safety valve for chemical industry according to claim 6, characterized in that, The elastic part includes springs (26) and limit blocks (24), the lower end of the fixed column (17) and one side of the moving column (21) are provided with embedded grooves (27), the embedded grooves (27) are fixedly provided with springs (26) therein, one end of the spring (26) away from the embedded groove (27) is fixedly connected with the corresponding moving block (18) and moving block (23) respectively, and the limit blocks (24) are fixedly arranged at both ends of one side of the moving block (18) and the moving block (23) close to the spring (26). The embedded grooves (27) are in communication with the limit grooves (25) corresponding to the positions of the limit blocks (24), and the limit blocks (24) are clamped in the corresponding limit grooves (25).

8. The safety valve for chemical industry according to claim 1, characterized by The side, where the valve core (3) contacts the valve body (1), is provided with a plurality of annular grooves (301), the annular grooves (301) are fixedly provided with sealing rings (11) therein, the annular grooves (301) are in communication with a plurality of spring grooves (302) therein, the spring grooves (302) are fixedly provided with springs (12) therein, the springs (12) abut one side of the sealing rings (11), and the other side of the sealing rings (11) abuts the valve body (1).

9. The safety valve for chemical industry according to claim 1, characterized by The valve body (1) is fixedly provided with a valve seat (2) at the position of the lower end of the valve core (3), the upper end of the valve seat (2) is provided with a sealing ring groove (201), the sealing ring groove (201) is in communication with a plurality of bottom grooves (202) therein, the sealing ring groove (201) is fixedly provided with a sealing ring (13) therein, the bottom grooves (202) are fixedly provided with springs (14) therein, the springs (14) abut one side of the sealing ring (13), and the other side of the sealing ring (13) abuts the valve core (3).

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