Safety valve body

Abstract

The safety valve body comprises a valve body, a valve cover assembly, a valve rod assembly and a valve element assembly, a pressure relief cavity is formed in the valve body, a conical inlet is formed in the bottom of the valve body, a pressure relief outlet is formed in one side of the valve body, an installation part is arranged in the valve body, and the installation part and the conical inlet are arranged in a matched mode. The valve element assembly comprises a sealing valve element, a sealing seat body and a sealing ball body, the top of the sealing seat body is connected with the valve rod assembly, the sealing ball body and the sealing valve element are fixedly arranged at the bottom of the sealing seat body, the sealing valve element and the sealing ball body are arranged in a matched mode, and one end of the sealing valve element can be inserted into the installation part and is sealed with the installation part. And the sealing ball body can be inserted into the conical inlet through the mounting part and is sealed with the conical inlet, so that the problems that the sealing performance between the valve core and the valve body is insufficient and a medium can flow out of the safety valve when the pressure is not overhigh when the existing direct-acting safety valve is used are solved.

Description

Technical Field

[0001] This utility model relates to the field of safety valve technology, and in particular to a safety valve body. Background Technology

[0002] A safety valve is an important safety device primarily used to prevent accidents caused by equipment or pipelines exceeding safe pressure limits. In operation, when the pressure of the medium within the equipment or pipeline rises above a specified value, the safety valve releases the medium, thus preventing the pressure from exceeding the prescribed level. The widespread use of safety valves effectively protects the personal safety of operators and the operational safety of pipelines and equipment.

[0003] Safety valves in the current technology can be classified into direct-acting safety valves and indirect-acting safety valves according to their operating principle. Direct-acting safety valves open directly under the action of the working medium, meaning they rely on the pressure of the working medium to overcome the mechanical load applied to the valve disc by the loading mechanism. However, current direct-acting safety valves suffer from insufficient sealing between the valve core and the valve body, allowing the medium to leak from the safety valve even when there is no overpressure.

[0004] A safety valve is disclosed in utility model application CN202320717130.1 (publication number CN219221385U), comprising a valve body and a spring. A valve seat is fixed to the lower end of the valve body, a discharge pipe is installed on the side wall of the valve body, and a sleeve is fixed to the upper end of the valve body. The spring is installed inside the sleeve, and a valve core is installed inside the valve body. The bottom of the valve core abuts against the upper end of the valve seat, and a valve stem is fixed to the upper end of the valve core. The upper end of the valve stem passes through the valve body and the sleeve, and a valve cover is fixed to the center of the upper end of the sleeve. The upper end of the valve stem is movably connected to the valve seat, the bottom of the spring is fixed to the valve stem, and the upper end of the spring is fixed to a movable plate, which is slidably connected inside the sleeve. However, in use, the valve still suffers from insufficient sealing between the valve core and the valve body, allowing the medium to leak from the safety valve even when there is no overpressure. Utility Model Content

[0005] Based on this, and in response to the above problems, this utility model proposes a safety valve body that solves the problem that the current direct-acting safety valves have insufficient sealing between the valve core and the valve body, and that the medium will flow out of the safety valve even when there is no overpressure.

[0006] The technical solution of this utility model is:

[0007] A safety valve body includes a valve body, a valve cover assembly, a valve stem assembly, and a valve core assembly. The valve cover assembly is disposed on the top of the valve body. One end of the valve stem assembly is connected to the valve cover assembly, and the other end extends into the valve body. The valve core assembly is disposed in the valve body and is connected to the valve stem assembly.

[0008] The valve body is provided with a pressure relief chamber, the bottom of the valve body is provided with a conical inlet communicating with the pressure relief chamber, the side of the valve body is provided with a pressure relief outlet communicating with the pressure relief chamber, and the valve body is provided with a mounting part, which is configured to cooperate with the conical inlet;

[0009] The valve core assembly includes a sealing valve core, a sealing seat, and a sealing ball. The top of the sealing seat is connected to the valve stem assembly. The sealing ball and the sealing valve core are fixedly installed at the bottom of the sealing seat. The sealing valve core and the sealing ball are fitted together. One end of the sealing valve core can be inserted into the mounting part and forms a seal with the mounting part. The sealing ball can be inserted into the conical inlet through the mounting part and forms a seal with the conical inlet.

[0010] Preferably, the valve body has an installation port on the top, the valve cover assembly is fitted with the installation port, and is detachably connected to the valve body.

[0011] Preferably, the valve cover assembly includes a valve cover body and a valve handle. The bottom of the valve cover body is provided with a first insertion part that can be inserted into the mounting port and a second insertion part that can be inserted into the pressure relief chamber through the mounting port. The first insertion part is located outside the second insertion part and can contact the inner wall of the mounting port. The first insertion part is slidably connected to the mounting port. The valve handle is detachably disposed on the top of the valve cover body.

[0012] Preferably, the bottom of the valve cover body and the top of the valve body are detachably connected by bolts. The bottom of the valve cover body is provided with a sealing gasket that matches the top of the valve body. The sealing gasket is embedded in the bottom of the valve cover body. When the bottom of the valve cover body contacts the top of the valve body, the sealing gasket contacts the top of the valve body and forms a seal.

[0013] Preferably, the valve cover body has a fixed seat on each of its two sides at the top, and the valve handle is connected to the fixed seat at both ends by cotter pins. One end of the cotter pin passes through the fixed seat and the valve handle and is clearance-fitted with the fixed seat and the valve handle. The end of the cotter pin that passes through the fixed seat and the valve handle is provided with a pin, which passes through the cotter pin and is inserted into the cotter pin.

[0014] Preferably, the valve stem assembly includes a valve stem body, a retaining ring, a mounting sleeve, an adjusting sleeve, and a spring. One end of the valve stem body passes through the bottom of the valve cover body and the second insertion part, and extends into the pressure relief chamber. The valve stem body is slidably connected to the bottom of the valve cover body and the second insertion part. The end of the valve stem body located in the pressure relief chamber is detachably connected to the top of the sealing seat. The retaining ring is fixedly mounted on the valve stem body and can contact the bottom of the valve cover body. The mounting sleeve is mounted on the upper end of the valve stem body and is slidably connected to the valve stem body. The top of the valve cover body is provided with a sliding groove that cooperates with the mounting sleeve. The mounting sleeve is slidably connected to the sliding groove and cooperates with the valve handle. The bottom of the valve handle can contact and limit the movement with the top of the mounting sleeve. The adjusting sleeve is mounted on the lower end of the mounting sleeve and is threadedly connected to the mounting sleeve. The spring is mounted on the valve stem body, with one end contacting the adjusting sleeve and the other end contacting the retaining ring.

[0015] Preferably, the valve handle has a through slot for the valve stem body to pass through, one end of the valve stem body is located in the through slot and is clearance-fitted with the through slot, the valve stem body and the valve handle are connected by a safety rod, the valve stem body and the valve handle have pin holes that cooperate with the safety rod, one end of the safety rod can be inserted into the pin hole, the top of the valve stem body has a threaded hole that communicates with the pin hole, a break pin is provided in the threaded hole, the break pin is threadedly connected to the threaded hole, the safety rod has a small hole that cooperates with the break pin, one end of the break pin is located in the small hole.

[0016] Preferably, a first flange and a second flange are fixedly provided on the valve body. The first flange is fitted to the end of the valve body with the tapered inlet, and the second flange is fitted to the end of the valve body with the pressure relief outlet.

[0017] Preferably, a sealing diaphragm is provided on one side of the second flange to cooperate with the pressure relief outlet. The sealing diaphragm is detachably connected to the second flange and is used to prevent dust from entering the pressure relief chamber of the valve body through the pressure relief outlet.

[0018] Preferably, the sealing diaphragm includes a mounting ring and a sealing membrane, with the sealing membrane fixedly disposed inside the mounting ring, and the mounting ring being detachably connected to the second flange by bolts.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This invention features a sealing ball and a conical inlet. Inserting the sealing ball into the conical inlet creates a first-level seal. A sealing valve core and a mounting part are then incorporated, allowing the valve core to be inserted into the mounting part, creating a second-level seal. This double sealing provides a better seal when the medium is not under excessive pressure. Compared to traditional safety valves, this invention offers superior sealing, solving the problem of insufficient sealing between the valve core and body in current direct-acting safety valves, which allow the medium to leak even when there is no excessive pressure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a safety valve body as described in an embodiment of this utility model;

[0022] Figure 2 This is a partial structural schematic diagram of a safety valve body as described in an embodiment of this utility model;

[0023] Figure 3 This is a cross-sectional structural diagram of a safety valve body as described in an embodiment of this utility model;

[0024] Figure 4 This is a schematic diagram of the valve core assembly described in the embodiments of this utility model;

[0025] Figure 5 This is a schematic diagram of the valve body structure described in the embodiments of this utility model. Figure 1 ;

[0026] Figure 6 This is a schematic diagram of the valve body structure described in the embodiments of this utility model. Figure 2 ;

[0027] Figure 7 This is a schematic diagram of the structure of the valve cover assembly described in this embodiment of the utility model. Figure 1 ;

[0028] Figure 8 This is a schematic diagram of the structure of the valve cover assembly described in this embodiment of the utility model. Figure 2 ;

[0029] Figure 9 This is a schematic diagram of the valve stem assembly described in this embodiment of the utility model. Figure 1 ;

[0030] Figure 10 This is a schematic diagram of the valve stem assembly described in this embodiment of the utility model. Figure 2 ;

[0031] Explanation of reference numerals in the attached figures:

[0032] 10-Valve body, 100-Pressure relief chamber, 101-Conical inlet, 102-Pressure relief outlet, 103-Mounting part, 104-Mounting port, 105-First flange, 106-Second flange, 107-Sealing diaphragm, 108-Mounting ring, 109-Sealing membrane, 20-Valve cover assembly, 200-Valve cover body, 201-Valve handle, 202-First insertion part, 203-Second insertion part, 204-Sealing gasket, 205-Fixing seat, 206-Cotter pin 207-Pin, 208-Sliding groove, 209-Through groove, 210-Safety rod, 211-Pin hole, 212-Threaded hole, 213-Break pin, 214-Small hole, 30-Valve stem assembly, 300-Valve stem body, 301-Fixing ring, 302-Mounting sleeve, 303-Adjusting sleeve, 304-Spring, 40-Valve core assembly, 400-Sealing valve core, 401-Sealing seat, 402-Sealing ball, 403-Sealing ring, 404-Sealing ring. Detailed Implementation

[0033] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0034] Example:

[0035] like Figures 1 to 4As shown, in order to solve the above problems, this embodiment discloses a safety valve body, including a valve body 10, a valve cover assembly 20, a valve stem assembly 30 and a valve core assembly 40. The valve cover assembly 20 is disposed on the top of the valve body 10. One end of the valve stem assembly 30 is connected to the valve cover assembly 20 and the other end extends into the valve body 10. The valve core assembly 40 is disposed in the valve body 10 and is connected to the valve stem assembly 30.

[0036] The valve body 10 is provided with a pressure relief chamber 100, and the bottom of the valve body 10 is provided with a conical inlet 101 communicating with the pressure relief chamber 100. The valve body 10 is provided with a pressure relief outlet 102 communicating with the pressure relief chamber 102 on one side. The valve body 10 is provided with a mounting part 103, which is configured to cooperate with the conical inlet 101.

[0037] The valve core assembly 40 includes a sealing valve core 400, a sealing seat 401, and a sealing ball 402. The top of the sealing seat 401 is connected to the valve stem assembly 30. The sealing ball 402 and the sealing valve core 400 are fixedly disposed at the bottom of the sealing seat 401. The sealing valve core 400 and the sealing ball 402 are fitted together. One end of the sealing valve core 400 can be inserted into the mounting part 103 and forms a seal with the mounting part 103. The sealing ball 402 can be inserted into the conical inlet 101 through the mounting part 103 and forms a seal with the conical inlet 101.

[0038] This invention features a sealing ball 402 and a conical inlet 101. Inserting the sealing ball 402 into the conical inlet 101 creates a first-level seal. A sealing valve core 400 and a mounting part 103 are also included; inserting the sealing valve core 400 into the mounting part 103 creates a second-level seal. This double sealing provides a better sealing effect for the safety valve body 10 when the medium is not under excessive pressure. Compared to traditional safety valves, this invention offers superior sealing, solving the problem of insufficient sealing between the valve core and valve body 10 in current direct-acting safety valves, which allows the medium to leak from the safety valve even when there is no excessive pressure.

[0039] like Figure 4 As shown, in one embodiment, preferably, a sealing ring 404 is provided at the bottom of the sealing valve core 400. When the sealing valve core 400 is inserted into the mounting portion 103, the sealing ring 404 contacts the mounting portion 103 to form a seal.

[0040] In another embodiment, preferably, the sealing valve core 400 may be made of a sealing material, such as flexible rubber.

[0041] like Figure 5As shown, in order to facilitate the installation of the valve cover assembly 20, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that the valve body 10 is provided with an installation port 104 at the top, the valve cover assembly 20 is configured to cooperate with the installation port 104, and is detachably connected to the valve body 10.

[0042] like Figures 7 to 8 As shown, the valve cover assembly 20 includes a valve cover body 200 and a valve handle 201. The bottom of the valve cover body 200 is provided with a first insertion part 202 that can be inserted into the mounting port 104 and a second insertion part 203 that can be inserted into the pressure relief chamber 100 through the mounting port 104. The first insertion part 202 is located outside the second insertion part 203, and the first insertion part 202 can contact the inner wall of the mounting port 104. The first insertion part 202 is slidably connected to the mounting port 104. The valve handle 201 is detachably disposed on the top of the valve cover body 200.

[0043] The bottom of the valve cover body 200 is detachably connected to the top of the valve body 10 by bolts. The bottom of the valve cover body 200 is provided with a sealing gasket 204 that matches the top of the valve body 10. The sealing gasket 204 is embedded in the bottom of the valve cover body 200. When the bottom of the valve cover body 200 contacts the top of the valve body 10, the sealing gasket 204 contacts the top of the valve body 10 and forms a seal.

[0044] In use, the bottom of the valve cover body 200 can be installed at the mounting port 104 on the top of the valve body 10, with the first insertion part 202 contacting the inner wall of the mounting port 104, and the second insertion part 203 inserted into the pressure relief chamber 100 through the mounting port 104. Then, the valve cover assembly 20 is installed by fixing it with bolts. Simultaneously, the sealing gasket 204 effectively improves the sealing performance between the valve cover assembly 20 and the valve body 10.

[0045] like Figures 7 to 8 As shown, in order to facilitate the installation of the valve handle 201, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that the valve cover body 200 is provided with fixing seats 205 on both sides of the top. The two ends of the valve handle 201 are connected to the fixing seats 205 by cotter pins 206. One end of the cotter pin 206 passes through the fixing seat 205 and the valve handle 201 and is clearance-fitted with the fixing seat 205 and the valve handle 201. The end of the cotter pin 206 that passes through the fixing seat 205 and the valve handle 201 is provided with a pin 207. The pin 207 passes through the cotter pin 206 and is inserted into the cotter pin 206.

[0046] The valve handle 201 is fixed by cotter pin 206 and pin 207, which allows the valve handle 201 to be quickly disassembled during testing, thereby completing the pressure relief and facilitating manual inspection of whether there are any abnormalities in the valve body 10.

[0047] like Figures 9 to 10As shown, to facilitate the installation of the valve stem assembly 30 and to automatically open the valve core assembly 40 in case of overpressure, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that the valve stem assembly 30 includes a valve stem body 300, a retaining ring 301, an mounting sleeve 302, an adjusting sleeve 303, and a spring 304. One end of the valve stem body 300 penetrates the bottom of the valve cover body 200 and the second insertion part 203, and extends into the pressure relief chamber 100. The valve stem body 300 is slidably connected to the bottom of the valve cover body 200 and the second insertion part 203. The end of the valve stem body 300 located inside the pressure relief chamber 100 is detachably connected to the top of the sealing seat 401. The retaining ring... 301 is fixedly mounted on the valve stem body 300. The fixing ring 301 can contact the bottom of the valve cover body 200. The mounting sleeve 302 is fitted on the upper end of the valve stem body 300 and is slidably connected to the valve stem body 300. The top of the valve cover body 200 is provided with a sliding groove 208 that cooperates with the mounting sleeve 302. The mounting sleeve 302 is slidably connected to the sliding groove 208 and is also cooperated with the valve handle 201. The bottom of the valve handle 201 can contact and limit the movement with the top of the mounting sleeve 302. The adjusting sleeve 303 is fitted on the lower end of the mounting sleeve 302 and is threadedly connected to the mounting sleeve 302. The spring 304 is fitted on the valve stem body 300, with one end contacting the adjusting sleeve 303 and the other end contacting the fixing ring 301.

[0048] The valve handle 201 has a through slot 209 for the valve stem body 300 to pass through. One end of the valve stem body 300 is located in the through slot 209 and is clearance-fitted with the through slot 209. The valve stem body 300 and the valve handle 201 are connected by a safety rod 210. The valve stem body 300 and the valve handle 201 have pin holes 211 that cooperate with the safety rod 210. One end of the safety rod 210 can be inserted into the pin hole 211. The top of the valve stem body 300 has a threaded hole 212 that communicates with the pin hole 211. A break pin 213 is provided in the threaded hole 212 and is threadedly connected to the threaded hole 212. The safety rod 210 has a small hole 214 that cooperates with the break pin 213. One end of the break pin 213 is located in the small hole 214.

[0049] like Figure 4 As shown, as a further preferred embodiment, the top of the sealing seat 401 is provided with a sealing ring 403.

[0050] During use, when the medium pressure at the conical inlet 101 exceeds the preset pressure value (overpressure), the sealing ball 402 and the sealing valve core 400 are driven upward, causing the valve stem body 300 to be subjected to an upward force. This causes the fixing ring 301 to overcome the resistance of the spring 304, resulting in the breakage of the safety rod 210 under the force and the action of the breaking nail 213. Simultaneously, the spring 304 is compressed, causing the valve stem body 300 to move upward, disengaging the sealing ball 402 and the sealing valve core 400 from the mounting part 103. This allows the conical inlet 101 to connect with the pressure relief chamber 100, allowing the medium to enter the pressure relief chamber 100 through the conical inlet 101 and then exit through the pressure relief outlet 102, completing the pressure relief. Simultaneously, a sealing ring 403 is provided at the top of the sealing seat 401, ensuring a seal when the sealing seat 401 moves to contact the bottom of the mounting sleeve 302, preventing the medium from flowing out from the gap between the valve stem body 300 and the mounting sleeve 302.

[0051] like Figure 6 As shown, in order to facilitate the installation and use of the safety valve body 10 of this utility model, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that a first flange 105 and a second flange 106 are fixedly provided on the valve body 10. The first flange 105 is configured to cooperate with the end of the valve body 10 that has a tapered inlet 101, and the second flange 106 is configured to cooperate with the end of the valve body 10 that has a pressure relief outlet 102.

[0052] The flange design facilitates the installation of this invention on pipes or equipment, thus making it easier to use.

[0053] To prevent dust from entering the pressure relief chamber 100, this embodiment is modified based on the above embodiment. The difference from the above embodiment is that a sealing diaphragm 107 is provided on one side of the second flange 106 to cooperate with the pressure relief outlet 102. The sealing diaphragm 107 is detachably connected to the second flange 106. The sealing diaphragm 107 is used to prevent dust from entering the pressure relief chamber 100 of the valve body 10 through the pressure relief outlet 102.

[0054] The sealing diaphragm 107 includes a mounting ring 108 and a sealing membrane 109. The sealing membrane 109 is fixedly disposed inside the mounting ring 108. The mounting ring 108 is detachably connected to the second flange 106 by bolts.

[0055] During use, the sealing diaphragm 107 helps prevent dust from entering the pressure relief chamber 100 of the valve body 10 through the pressure relief outlet 102. Simultaneously, when the medium exceeds a preset pressure value, the medium entering the pressure relief chamber 100 can break through the sealing diaphragm 109 and be discharged from the pressure relief outlet 102, thus completing the pressure relief.

[0056] Working principle of this utility model:

[0057] This invention features a sealing ball 402 and a conical inlet 101. Inserting the sealing ball 402 into the conical inlet 101 creates a first seal. By featuring a sealing valve core 400 and a mounting part 103, inserting the sealing valve core 400 into the mounting part 103 creates a second seal. This double seal allows the safety valve body 10 of this invention to have a better sealing effect when the medium is not under excessive pressure.

[0058] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A safety valve body, characterized in that, The valve body (10), valve cover assembly (20), valve stem assembly (30), and valve core assembly (40) are included. The valve cover assembly (20) is disposed on the top of the valve body (10). One end of the valve stem assembly (30) is connected to the valve cover assembly (20), and the other end extends into the valve body (10). The valve core assembly (40) is disposed in the valve body (10) and connected to the valve stem assembly (30). The valve body (10) is provided with a pressure relief chamber (100), the bottom of the valve body (10) is provided with a conical inlet (101) communicating with the pressure relief chamber (100), the side of the valve body (10) is provided with a pressure relief outlet (102) communicating with the pressure relief chamber (100), and the valve body (10) is provided with a mounting part (103), which is configured to cooperate with the conical inlet (101); The valve core assembly (40) includes a sealing valve core (400), a sealing seat (401), and a sealing ball (402). The top of the sealing seat (401) is connected to the valve stem assembly (30). The sealing ball (402) and the sealing valve core (400) are fixedly disposed at the bottom of the sealing seat (401). The sealing valve core (400) and the sealing ball (402) are fitted together. One end of the sealing valve core (400) can be inserted into the mounting part (103) and form a seal with the mounting part (103). The sealing ball (402) can be inserted into the conical inlet (101) through the mounting part (103) and form a seal with the conical inlet (101).

2. The safety valve body according to claim 1, characterized in that, The valve body (10) has an installation port (104) on the top, and the valve cover assembly (20) is fitted with the installation port (104) and is detachably connected to the valve body (10).

3. The safety valve body according to claim 2, characterized in that, The valve cover assembly (20) includes a valve cover body (200) and a valve handle (201). The bottom of the valve cover body (200) is provided with a first insertion part (202) that can be inserted into the mounting port (104) and a second insertion part (203) that can be inserted into the pressure relief chamber (100) through the mounting port (104). The first insertion part (202) is located outside the second insertion part (203), and the first insertion part (202) can contact the inner wall of the mounting port (104). The first insertion part (202) is slidably connected to the mounting port (104). The valve handle (201) is detachably disposed on the top of the valve cover body (200).

4. The safety valve body according to claim 3, characterized in that, The bottom of the valve cover body (200) is detachably connected to the top of the valve body (10) by bolts. The bottom of the valve cover body (200) is provided with a sealing gasket (204) that matches the top of the valve body (10). The sealing gasket (204) is embedded in the bottom of the valve cover body (200). When the bottom of the valve cover body (200) contacts the top of the valve body (10), the sealing gasket (204) contacts the top of the valve body (10) and forms a seal.

5. The safety valve body according to claim 4, characterized in that, The valve cover body (200) has fixed seats (205) on both sides of the top. The valve handle (201) is connected to the fixed seats (205) at both ends by cotter pins (206). One end of the cotter pin (206) passes through the fixed seat (205) and the valve handle (201) and is clearance-fitted with the fixed seat (205) and the valve handle (201). One end of the cotter pin (206) that passes through the fixed seat (205) and the valve handle (201) is provided with a pin (207). The pin (207) passes through the cotter pin (206) and is inserted into the cotter pin (206).

6. A safety valve body according to claim 5, characterized in that, The valve stem assembly (30) includes a valve stem body (300), a retaining ring (301), a mounting sleeve (302), an adjusting sleeve (303), and a spring (304). One end of the valve stem body (300) passes through the bottom of the valve cover body (200) and the second insertion part (203), and extends into the pressure relief chamber (100). The valve stem body (300) is slidably connected to the bottom of the valve cover body (200) and the second insertion part (203). The end of the valve stem body (300) located in the pressure relief chamber (100) is detachably connected to the top of the sealing seat body (401). The retaining ring (301) is fixedly mounted on the valve stem body (300). The retaining ring (301) can be attached to the valve cover body (200). The bottom contact is provided with a mounting sleeve (302) which is fitted on the upper end of the valve stem body (300) and is slidably connected to the valve stem body (300). The top of the valve cover body (200) is provided with a sliding groove (208) that cooperates with the mounting sleeve (302). The mounting sleeve (302) is slidably connected to the sliding groove (208) and is cooperated with the valve handle (201). The bottom of the valve handle (201) can contact and limit the top of the mounting sleeve (302). The adjusting sleeve (303) is fitted on the lower end of the mounting sleeve (302) and is threadedly connected to the mounting sleeve (302). The spring (304) is fitted on the valve stem body (300), with one end in contact with the adjusting sleeve (303) and the other end in contact with the fixing ring (301).

7. A safety valve body according to claim 6, characterized in that, The valve handle (201) has a through slot (209) for the valve stem body (300) to pass through. One end of the valve stem body (300) is located inside the through slot (209) and is clearance-fitted with the through slot (209). The valve stem body (300) and the valve handle (201) are connected by a safety rod (210). The valve stem body (300) and the valve handle (201) have pin holes (211) that mate with the safety rod (210). One end of the rod (210) can be inserted into the pin hole (211). The top of the valve stem body (300) is provided with a threaded hole (212) that communicates with the pin hole (211). A break pin (213) is provided in the threaded hole (212). The break pin (213) is threadedly connected to the threaded hole (212). The safety rod (210) is provided with a small hole (214) that cooperates with the break pin (213). One end of the break pin (213) is located in the small hole (214).

8. A safety valve body according to claim 1 or 7, characterized in that, A first flange (105) and a second flange (106) are fixedly provided on the valve body (10). The first flange (105) is fitted with one end of the valve body (10) that has a tapered inlet (101), and the second flange (106) is fitted with one end of the valve body (10) that has a pressure relief outlet (102).

9. A safety valve body according to claim 8, characterized in that, The second flange (106) has a sealing diaphragm (107) on one side that is configured to cooperate with the pressure relief outlet (102). The sealing diaphragm (107) is detachably connected to the second flange (106). The sealing diaphragm (107) is used to prevent dust from entering the pressure relief chamber (100) of the valve body (10) through the pressure relief outlet (102).

10. A safety valve body according to claim 9, characterized in that, The sealing diaphragm (107) includes a mounting ring (108) and a sealing membrane (109). The sealing membrane (109) is fixedly disposed inside the mounting ring (108). The mounting ring (108) is detachably connected to the second flange (106) by bolts.

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