Compact breathing type safety valve

Abstract

The invention relates to a safety valve, in particular to a compact breathing type safety valve which solves the problems that an existing breathing type safety valve is too large in overall height size and not suitable for being installed in a small space. The valve body and the valve cover are connected in a matched mode through an inner boss and an outer boss, a discharge valve clack is coaxially arranged in the valve body, the bottom of the discharge valve clack is located on the supporting edge of the valve body, a suction valve clack is coaxially arranged in the discharge valve clack, a screw seat for installing an adjusting screw is arranged on the valve cover, the adjusting screw is of a hollow structure, and the bottom of the adjusting screw abuts against a top cover which is coaxially arranged. A first through hole and a second through hole are formed in the center of the top cover and the center of the adjusting screw rod, one end of the discharge valve spring abuts against the top cover, the other end of the discharge valve spring abuts against the discharge valve clack, one end of the suction valve spring abuts against a spring limiting seat arranged at the top end of the suction valve clack, and the other end of the suction valve spring abuts against the discharge valve clack. The spring limiting seat, the partial suction valve clack and the partial suction valve spring can penetrate through the first through hole and the second through hole to enter the adjusting screw rod.

Description

Technical Field

[0001] The invention relates to a safety valve, in particular to a compact breathing safety valve. Background Art

[0002] As an important safety accessory of railway tank cars, the breathing safety valve adjusts the pressure difference between the inside and outside of the tank body through the cooperation of the suction valve assembly and the discharge valve assembly installed in the accommodating cavity composed of the valve body and the valve cover, thereby ensuring the safety of the tank body during the operation of the railway tank car.

[0003] At present, the breathing safety valves installed in a large number of normal pressure railway tank cars mostly use a threaded connection structure between the valve cover and the valve body. The threaded connection structure can connect the valve body and the valve cover on the one hand, and adjust the working height of the spring on the other hand. However, this connection structure has the following problems during use:

[0004] 1) The thread matching length of the valve cover and the valve body is large, which means that the two usually need to be rotated more than 30 times when they are separated, which can easily damage the thread, causing the valve body and the valve cover to get stuck or even stuck, which in turn makes it impossible for the safety valve to be disassembled normally, affecting the maintenance and normal scrapping of the safety valve;

[0005] 2) Before assembly, the thread surface quality of the valve cover and valve body must be checked, impurities on the thread surface must be cleaned, and anti-seizing agent must be applied to the thread surface. The operation is complicated and time-consuming.

[0006] The Chinese utility model patent with authorization announcement number CN213839718U discloses a breathing safety valve, in which the valve cover and the valve body are connected by a flange and a connecting shaft. Although this structure solves the problem caused by the threaded connection between the valve body and the valve cover, the breathing safety valve using this structure is specially provided with a structure for adjusting the working height of the spring on the valve cover, which causes the overall height dimension of the breathing safety valve to be too large, which will affect the normal installation of the safety valve when the space is limited. Summary of the invention

[0007] The purpose of the present invention is to solve the problem that the overall height of the existing breathing safety valve is too large and is not suitable for installation in a small space, and to provide a compact breathing safety valve.

[0008] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides the following technical solutions:

[0009] A compact breathing safety valve comprises a valve body and a valve cover, and is special in that it also comprises a discharge valve assembly, a suction valve assembly, and a regulating assembly;

[0010] The outer peripheral surface of the top of the valve body is provided with a plurality of external bosses, wherein the bottom of at least one external boss is provided with a groove, and the inner wall of the bottom of the valve cover is correspondingly provided with a plurality of internal bosses matching with the external bosses, wherein the shape of at least one internal boss is adapted to the shape of the groove;

[0011] The discharge valve assembly comprises a discharge valve disc coaxially arranged inside the valve body and a discharge valve spring sleeved on the discharge valve disc, wherein the bottom of the discharge valve disc abuts against the supporting edge of the bottom of the valve body;

[0012] The suction valve assembly comprises a suction valve disc coaxially arranged inside the discharge valve disc and with the upper end extending out of the discharge valve disc, and a suction valve spring sleeved on the discharge valve disc and the suction valve disc, the suction valve spring being located inside the discharge valve spring, a spring limiting seat being arranged at the upper end of the suction valve disc, one end of the suction valve spring abutting against the bottom of the spring limiting seat, and the other end abutting against the discharge valve disc;

[0013] The adjusting assembly includes an adjusting screw seat axially arranged at the inner center of the valve cover and a top cover coaxially arranged on the outer side of the adjusting screw seat, a threaded hole is arranged inside the adjusting screw seat, an adjusting screw is arranged in the threaded hole, the interior of the adjusting screw is a hollow structure, a first through hole is arranged at the bottom center, the bottom of the adjusting screw abuts against the top cover, a second through hole is opened at the center of the top cover, the diameters of the first through hole and the second through hole are both larger than the diameter of the spring limiting seat, one end of the discharge valve spring abuts against the top cover, and the other end abuts against the discharge valve disc, when the discharge valve disc moves upward, the spring limiting seat, part of the suction valve disc and part of the suction valve spring can pass through the first through hole and the second through hole into the interior of the adjusting screw.

[0014] Furthermore, the suction valve disc includes a base and a guide rod arranged at the top center of the base, a conical boss is arranged at the top center of the discharge valve disc, a central through hole slidingly matched with the guide rod is opened in the center of the conical boss, the base is coaxially arranged in the discharge valve disc, the upper end of the guide rod extends out of the upper end of the conical boss, and the spring limit seat is arranged at the top of the guide rod; one end of the suction valve spring is arranged on the outside of the guide rod and abuts against the bottom of the spring limit seat, and the other end away from the spring limit seat is sleeved on the outside of the conical boss and abuts against the discharge valve disc.

[0015] Furthermore, the top cover is a bowl-shaped structure with a horizontal outer edge on the top, and the outer wall of the top cover and the horizontal outer edge constitute a limiting structure for limiting the release valve spring. One end of the release valve spring is sleeved on the outer wall of the top cover and abuts against the bottom of the horizontal outer edge. There is a 0.5-1mm gap between the release valve disc and the inner wall of the valve body on one side. A limiting step is provided on the top of the release valve disc, and the other end of the release valve spring abuts against the limiting step, and the inner side of the release valve spring abuts against the outer wall of the limiting step.

[0016] Furthermore, a limiting groove communicating with the second through hole is provided at the inner center of the bottom of the top cover, and the diameter of the second through hole is smaller than the diameter of the limiting groove, and the bottom of the adjusting screw abuts against the bottom of the limiting groove.

[0017] Furthermore, a limit screw for limiting the position of the adjusting screw is abutted against the top of the adjusting screw, a through hole is provided at the center of the top of the valve cover, and the diameter of the through hole is smaller than the diameter of the threaded hole to prevent the limit screw from falling out, a regular hexagonal through hole for cooperating with an inner hexagonal wrench is provided at the center of the top of the adjusting screw, and a regular hexagonal through hole for cooperating with an inner hexagonal wrench is axially penetrated through the center of the limit screw, and in order not to affect each other during adjustment, the diameter of the circumscribed circle of the regular hexagonal through hole of the adjusting screw is smaller than the diameter of the inscribed circle of the regular hexagonal through hole of the limiting screw.

[0018] Furthermore, three outer bosses are provided, one of which has a groove at its bottom, and three inner bosses are provided correspondingly, and the shape of any inner boss is compatible with the shape of the groove.

[0019] Furthermore, in order to reduce the number of turns of the adjusting screw during use, the internal thread of the threaded hole, the external thread of the adjusting screw, and the external thread of the limit screw all adopt coarse thread; in order to prevent sticking during the adjustment process, the valve body and valve cover are made of stainless steel, and the adjusting screw is made of tin bronze.

[0020] Furthermore, a protrusion is arranged on the edge of the through hole at the top of the valve cover, and a plug cover is arranged on the top of the through hole to cooperate with the protrusion and to seal the threaded hole.

[0021] Furthermore, a threaded section is provided at the top end of the guide rod, a limiting nut located at the top of the spring limiting seat is sleeved on the threaded section, and the outer diameter of the limiting nut is smaller than the outer diameter of the spring limiting seat.

[0022] Furthermore, in order to ensure the sealing performance of the safety valve, a first sealing ring is provided between the bottom of the discharge valve disc and the supporting edge of the bottom of the valve body, and a second sealing ring is provided between the base of the suction valve disc and the discharge valve disc.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention provides a compact breathing safety valve including a valve body, a valve cover, a discharge valve assembly, a suction valve assembly and an adjustment assembly, wherein the valve body is provided with a plurality of external bosses, at least one of which is provided with a groove at the bottom, and the valve cover is provided with a plurality of internal bosses, at least one of which is provided with a shape matching the groove, so that the valve body and the valve cover can be connected by the cooperation of the internal and external bosses, and the relative rotation of the valve body and the valve cover is limited by the groove to prevent the valve body and the valve cover from loosening due to vibration during use, thereby avoiding the problems existing in the threaded connection structure. The adjusting screw in the adjustment assembly is set as a hollow structure, a first through hole is provided at the center of the bottom thereof, and a second through hole is provided at the center of the top cover abutted by the adjusting screw. When the discharge valve disc moves upward, the spring limit seat, part of the suction valve disc and part of the suction valve spring can pass through the first through hole and the second through hole to enter the interior of the adjusting screw, thereby utilizing the internal space provided by the adjusting screw, reducing the overall height of the safety valve, saving space, and being suitable for installation in a small space.

[0025] (2) The threaded hole, the adjusting screw and the limit screw in the compact breathing safety valve provided by the present invention adopt coarse thread matching, with a small number of meshing teeth, which greatly reduces the number of rotations of the adjusting screw during use while ensuring stable connection.

[0026] (3) In a compact breathing safety valve provided by the present invention, a limiting screw is arranged on the top of the adjusting screw, and both of them are provided with a regular hexagonal through hole matched with an inner hexagonal wrench on the top, and the diameter of the circumscribed circle of the regular hexagonal through hole of the adjusting screw is smaller than the diameter of the inscribed circle of the regular hexagonal through hole of the limiting screw, so that the two do not affect each other during adjustment.

[0027] (4) In a compact breathing safety valve provided by the present invention, a plug cover is provided at the top through hole of the valve cover for sealing the threaded hole, and a protrusion is provided at the edge of the through hole. The protrusion cooperates with the plug cover, thereby preventing water from entering the safety valve from the top of the threaded hole in rainy and snowy weather. In addition, the diameter of the top through hole is smaller than the threaded hole, thereby preventing the limiting screw from accidentally loosening and falling out of the threaded hole during the operation of the vehicle.

[0028] (5) In a compact breathing safety valve provided by the present invention, a first sealing ring is arranged between the bottom of the discharge valve disc and the supporting edge of the bottom of the valve body, and a second sealing ring is arranged between the base of the suction valve disc and the discharge valve disc, thereby ensuring the sealing performance of the safety valve.

[0029] (6) In a compact breathing safety valve provided by the present invention, there is a gap of 0.5-1 mm on one side between the discharge valve disc and the inner wall of the valve body, so as to prevent the discharge valve disc from getting stuck and causing the safety valve to fail. The up and down movement of the discharge valve disc is no longer guided by the inner wall of the valve body, but by the limit step, the discharge valve spring and the limit structure on the top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A cross-sectional view of an embodiment of a compact breathing safety valve of the present invention;

[0031] Figure 2 It is a three-dimensional structural schematic diagram of an embodiment of a compact breathing safety valve of the present invention;

[0032] Figure 3 It is a schematic diagram of the three-dimensional structure of the valve body in the embodiment of the compact breathing safety valve of the present invention;

[0033] Figure 4 It is a schematic diagram of the three-dimensional structure of the valve cover in the embodiment of the compact breathing safety valve of the present invention;

[0034] Figure 5 A cross-sectional view of a valve cover in an embodiment of a compact breathing safety valve of the present invention;

[0035] Figure 6 It is a schematic diagram of the three-dimensional structure of the adjusting screw in the embodiment of the compact breathing safety valve of the present invention;

[0036] Figure 7 It is a cross-sectional view of the top cover in the embodiment of the compact breathing safety valve of the present invention.

[0037] The following are the descriptions of the reference numerals:

[0038] 1-valve body, 101-external boss; 2-valve cover, 21-adjusting screw seat, 22-internal boss; 3-drain valve disc,

[0039] 31-conical boss; 4-suction valve disc, 41-base, 42-guide rod; 5-discharge valve spring, 6-suction valve spring,

[0040] 7-spring limiting seat, 8-top cover, 81-second through hole, 82-limiting groove; 9-plug cover, 10-limiting screw, 11-adjusting screw, 111-first through hole; 12-limiting nut, 13-second sealing ring, 14-first sealing ring. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0042] Reference Figure 1-Figure 7 The present invention provides a compact breathing safety valve, comprising a valve body 1 and a valve cover 2. Both the valve body 1 and the valve cover 2 are made of stainless steel, which is corrosion-resistant and suitable for the working environment of the safety valve. Figure 3As shown, three outer bosses 101 are arranged on the outer peripheral surface of the top of the valve body 1, and a groove is arranged at the bottom of one of the outer bosses 101. Three inner bosses 22 cooperating with the outer bosses 101 are also arranged correspondingly on the inner wall of the bottom of the valve cover 2. The shape of any inner boss 22 is adapted to the shape of the groove, so that when the inner boss 22 is matched with the groove, the relative rotation of the valve cover 2 and the valve body 1 will be limited, thereby preventing the valve cover 2 and the valve body 1 from loosening due to the vibration of the vehicle during driving.

[0043] The structure of the valve cover 2 is as follows Figure 4 , Figure 5 As shown, an adjusting screw seat 21 for installing the adjusting screw 11 is axially arranged at the inner center thereof, the interior of the adjusting screw seat 21 is a threaded hole, and a through hole is also opened at the top center of the valve cover 2, the diameter of the through hole is smaller than the diameter of the threaded hole, a protrusion is arranged on the edge of the through hole, and a plug cover 9 matching the protrusion is arranged on the top of the through hole to block the threaded hole, so as to prevent water from entering the interior of the safety valve in rainy and snowy weather and affecting the normal operation of the safety valve.

[0044] An adjusting screw 11 made of tin bronze is arranged in the threaded hole, and the valve cover 2 and the adjusting screw 11 are made of materials with different hardness to prevent jamming during use. The interior of the adjusting screw 11 is a hollow structure, and a first through hole 111 is provided at the center of its bottom, and a regular hexagonal through hole for cooperating with an inner hexagonal wrench is provided at the center of the top. In order to limit the position of the adjusting screw 11, a limiting screw 10 is abutted against the top of the adjusting screw 11, and a regular hexagonal through hole for cooperating with an inner hexagonal wrench is axially penetrated through the center of the limiting screw 10, and the circumscribed circle diameter of the regular hexagonal through hole of the adjusting screw 11 is smaller than the inscribed circle diameter of the regular hexagonal through hole of the limiting screw 10, so that the position of the adjusting screw 11 can be adjusted through the through hole on the top of the valve cover 2 without opening the valve cover 2, and the adjusting screw 11 and the limiting screw 10 do not affect each other when adjusting their positions. In order to make the adjustment more convenient, the internal thread of the threaded hole and the external thread of the adjusting screw 11 and the external thread of the limiting screw 10 all adopt coarse thread.

[0045] A top cover 8 is coaxially arranged on the outer side of the adjusting screw seat 21, and its structure is as follows: Figure 7 As shown, it is a bowl-shaped structure with a horizontal outer edge on the top, a second through hole 81 is provided in the center of the bottom, and a limiting groove 82 connected to the second through hole 81 is also provided in the inner center of the bottom, the diameter of the second through hole 81 is smaller than the diameter of the limiting groove 82, and the bottom of the adjusting screw 11 abuts against the bottom of the limiting groove 82. In this way, with the help of the cooperation between the limiting groove 82 and the adjusting screw 11, the position of the top cover 8 is fixed, and the top cover 8 will not move left and right when the safety valve is actuated, affecting the normal operation of the safety valve.

[0046] A discharge valve assembly is arranged inside the valve body 1, including a discharge valve disc 3 coaxially arranged inside the valve body 1. Figure 1 As shown, the bottom of the discharge valve flap 3 abuts against the supporting edge at the bottom of the valve body 1, the discharge valve flap 3 is sleeved with a discharge valve spring 5, a conical boss 31 is provided at the top center of the discharge valve flap 3, and a central through hole is provided at the center of the conical boss 31. The suction valve flap 4 of the suction valve assembly includes a base 41 coaxially arranged inside the discharge valve flap 3 and a guide rod 42 arranged at the top center of the base 41, the base 41 is coaxially arranged inside the discharge valve flap 3, the guide rod 42 is located in the central through hole and slidably cooperates with the central through hole, the upper end of the guide rod 42 extends out of the upper end of the conical boss, the central through hole provides a guide for the guide rod 42, so that the movement of the guide rod 42 is more precise, and the conical boss 31 extends the guide distance, so that the guide rod 41 can move more smoothly.

[0047] A spring limit seat 7 is provided at the top of the guide rod 42, a limit nut 12 is provided at the top of the spring limit seat 7, and a threaded section is provided at the top of the guide rod 42 for sleeve-mounting the limit nut 12. The outer diameter of the limit nut 12 is smaller than the outer diameter of the spring limit seat 7, so that the limit nut 12 will not affect the entry into the adjusting screw 11. The suction valve spring 6 is located in the discharge valve spring 5, and one end of the suction valve spring 6 is located outside the guide rod 42 and abuts against the bottom of the spring limit seat 7, and the end away from the spring limit seat 7 is sleeved on the outside of the conical boss 31 and abuts against the discharge valve disc 3.

[0048] In order to prevent the discharge valve disc 3 from getting stuck with the inner wall of the valve body 1 and causing the safety valve to fail, a gap of 0.5-1 mm exists on one side between the discharge valve disc 3 and the inner wall of the valve body 1 in this embodiment. When there is a gap, the inner wall of the valve body 1 can no longer be used to guide the movement of the discharge valve disc 3. Therefore, a limiting step is provided on the top of the discharge valve disc 3. The inner side of one end of the discharge valve spring 5 abuts against the outer wall of the limiting step, and the other end is sleeved on the outer wall of the top cover 8 and abuts against the bottom of the horizontal outer edge of the top cover 8. The outer wall of the top cover 8 and the horizontal outer edge form a limiting structure, which limits the discharge valve spring 5 to move only in the axial direction but not left and right. In this way, the limiting step, the discharge valve spring 5 and the limiting structure on the top cover 8 are used to guide the movement of the discharge valve disc 3.

[0049] The diameters of the first through hole 111 set at the bottom center of the adjusting screw 11 and the second through hole 81 set at the bottom center of the top cover 8 are both larger than the diameter of the spring limit seat 7. When the discharge valve disc 3 moves upward, the spring limit seat 7, part of the guide rod 42 and part of the suction valve spring 6 can pass through the first through hole 111 and the second through hole 81 to enter the interior of the adjusting screw 11.

[0050] In order to ensure the sealing of the safety valve, a first sealing ring 14 is provided between the bottom of the discharge valve disc 3 and the supporting edge of the bottom of the valve body 1 , and a second sealing ring 13 is provided between the base 41 of the suction valve disc 4 and the discharge valve disc 3 .

[0051] When in use, first place the three inner bosses 22 of the valve cover 2 staggered from the outer boss 101, then press down the valve cover 2, rotate the inner boss 22 matching the shape of the groove to the groove position, loosen the valve cover 2, and the valve cover 2 will move upward under the elastic force of the discharge valve spring 5, and the inner boss 22 matching the shape of the groove will be stuck in the groove, limiting the relative rotation of the valve cover 2 and the valve body 1, and the valve cover 2 and the valve body 1 are connected together through the cooperation of the inner boss 22 and the outer boss 101, avoiding the problems caused by the threaded connection. When the pressure in the tank truck is negative pressure, the discharge valve flap 3 is limited by the support edge at the bottom of the valve body 1, the suction valve flap 4 will move downward, and the suction valve spring 6 will be compressed. At this time, the interior of the tank truck is connected with the outside until the interior is no longer in a negative pressure state, and the suction valve flap 4 moves upward to reset. If the internal pressure of the tank truck is too large, the discharge valve flap 3 will be lifted up, and the discharge valve spring 5 will be compressed, which will drive the suction valve flap 4 to move upward. At this time, the spring limit seat 7, part of the guide rod 42 and part of the suction valve spring 6 will enter the adjusting screw 11 through the second through hole 81 and the first through hole 111 in turn. If you want to control the size of the discharge pressure, you can also adjust the position of the adjusting screw 11 through the through hole on the top of the valve cover 2, and then adjust the elastic force of the discharge valve spring 5. When adjusting, first remove the plug cover 9, and insert the hexagonal through hole that matches the regular hexagonal through hole on the top of the adjusting screw 11 through the through hole into the regular hexagonal through hole. After adjusting to the right position, take out the wrench, and insert the hexagonal through hole that matches the regular hexagonal through hole on the top of the limit screw 10 through the through hole into the regular hexagonal through hole. Adjust the position of the limit screw 10 so that it abuts against the adjusting screw 11. After the adjustment is completed, install the plug cover 9.

[0052] The embodiments described above are merely descriptions of specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A compact breathing safety valve, comprising a valve body (1) and a valve cover (2), Features: It also includes a discharge valve assembly, a suction valve assembly, and a regulating assembly; The top outer peripheral surface of the valve body (1) is provided with a plurality of external bosses (101), wherein the bottom of at least one of the external bosses (101) is provided with a groove, and the bottom inner wall of the valve cover (2) is correspondingly provided with a plurality of internal bosses (22) matching with the external bosses (101), wherein the shape of at least one of the internal bosses (22) is adapted to the shape of the groove; The discharge valve assembly comprises a discharge valve flap (3) coaxially arranged inside the valve body (1) and a discharge valve spring (5) sleeved on the discharge valve flap (3), and the bottom of the discharge valve flap (3) abuts against a supporting edge at the bottom of the valve body (1); The suction valve assembly comprises a suction valve disc (4) coaxially arranged inside the discharge valve disc (3) and with its upper end extending out of the discharge valve disc (3), and a suction valve spring (6) sleeved on the discharge valve disc (3) and the suction valve disc (4); the suction valve spring (6) is located inside the discharge valve spring (5); a spring limiting seat (7) is arranged at the upper end of the suction valve disc (4); one end of the suction valve spring (6) abuts against the bottom of the spring limiting seat (7), and the other end abuts against the discharge valve disc (3); The adjusting assembly comprises an adjusting screw seat (21) axially arranged at the center of the valve cover (2) and a top cover (8) coaxially arranged on the outside of the adjusting screw seat (21); a threaded hole is arranged inside the adjusting screw seat (21); an adjusting screw (11) is arranged in the threaded hole; the interior of the adjusting screw (11) is a hollow structure; a first through hole (111) is arranged at the center of the bottom; the bottom of the adjusting screw (11) abuts against the top cover (8); a second through hole (111) is opened at the center of the top cover (8) The diameters of the through hole (81), the first through hole (111) and the second through hole (81) are all larger than the diameter of the spring limit seat (7); one end of the discharge valve spring (5) abuts against the top cover (8) and the other end abuts against the discharge valve flap (3); when the discharge valve flap (3) moves upward, the spring limit seat (7), part of the suction valve flap (4) and part of the suction valve spring (6) can pass through the first through hole (111) and the second through hole (81) to enter the interior of the adjusting screw (11).

2. The compact breathing safety valve according to claim 1, Features: The suction valve flap (4) comprises a base (41) and a guide rod (42) arranged at the top center of the base (41); a conical boss (31) is arranged at the top center of the discharge valve flap (3); a central through hole slidably matched with the guide rod (42) is opened at the center of the conical boss (31); the base (41) is coaxially arranged in the discharge valve flap (3); the upper end of the guide rod (42) extends out of the upper end of the conical boss (31); and a spring limit seat (7) is arranged at the top of the guide rod (42); one end of the suction valve spring (6) is arranged on the outside of the guide rod (42) and abuts against the bottom of the spring limit seat (7); the other end away from the spring limit seat (7) is sleeved on the outside of the conical boss (31) and abuts against the discharge valve flap (3).

3. The compact breathing safety valve according to claim 2, Features: The top cover (8) is a bowl-shaped structure with a horizontal outer edge at the top. The outer wall of the top cover (8) and the horizontal outer edge form a limiting structure for limiting the release valve spring (5). One end of the release valve spring (5) is sleeved on the outer wall of the top cover (8) and abuts against the bottom of the horizontal outer edge. There is a gap of 0.5-1 mm between the release valve flap (3) and the inner wall of the valve body (1) on one side. A limiting step is provided on the top of the release valve flap (3). The other end of the release valve spring (5) abuts against the limiting step, and the inner side of the release valve spring (5) abuts against the outer wall of the limiting step.

4. The compact breathing safety valve according to claim 3, Features: A limiting groove (82) communicating with the second through hole (81) is provided at the inner center of the bottom of the top cover (8), and the diameter of the second through hole (81) is smaller than the diameter of the limiting groove (82), and the bottom of the adjusting screw (11) abuts against the bottom of the limiting groove (82).

5. The compact breathing safety valve according to claim 4, Features: The top of the adjusting screw (11) is abutted against a limiting screw (10) for limiting the position of the adjusting screw (11); the center of the top of the valve cover (2) is provided with a through hole, the diameter of the through hole is smaller than the diameter of the threaded hole; the center of the top of the adjusting screw (11) is provided with a regular hexagonal through hole for cooperating with an inner hexagonal wrench; the center of the limiting screw (10) is axially penetrated with a regular hexagonal through hole for cooperating with an inner hexagonal wrench; the diameter of the circumscribed circle of the regular hexagonal through hole of the adjusting screw (11) is smaller than the diameter of the inscribed circle of the regular hexagonal through hole of the limiting screw (10).

6. A compact breathing safety valve according to any one of claims 1 to 5, Features: The outer bosses (101) are provided in three pieces, one of which is provided with a groove at the bottom, and the inner bosses (22) are provided in three pieces correspondingly, and the shape of any inner boss (22) is compatible with the shape of the groove.

7. The compact breathing safety valve according to claim 5, Features: The internal thread of the threaded hole, the external thread of the adjusting screw (11) and the external thread of the limit screw (10) all adopt coarse thread; the valve body (1) and the valve cover (2) are made of stainless steel, and the adjusting screw (11) is made of tin bronze.

8. The compact breathing safety valve according to claim 7, Features: A protrusion is arranged at the edge of the through hole at the top of the valve cover (2), and a plug cover (9) is arranged at the top of the through hole and matches the protrusion and is used to block the threaded hole.

9. The compact breathing safety valve according to claim 2, Features: The top of the guide rod (42) is provided with a threaded section, on which a limiting nut (12) located at the top of the spring limiting seat (7) is sleeved, and the outer diameter of the limiting nut (12) is smaller than the outer diameter of the spring limiting seat (7).

10. The compact breathing safety valve according to claim 2, Features: A first sealing ring (14) is provided between the bottom of the discharge valve flap (3) and the supporting edge of the bottom of the valve body (1), and a second sealing ring (13) is provided between the base (41) of the suction valve flap (4) and the discharge valve flap (3).

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