An inflatable safety valve

Abstract

The present application provides an inflatable safety valve, which comprises a valve body and a blocking assembly, the valve body has a valve cavity, the blocking assembly comprises a plug, a cap and a blocking piece, the plug is detachably connected with one end of the valve body at least partially, the cap is detachably connected with the plug, the blocking piece is movably connected with the plug between a first position and a second position, the blocking piece comprises a vent hole, in the first position, the blocking piece is spaced apart from the plug at least partially to communicate the valve cavity with the outside through the vent hole, in the second position, the blocking piece is at least partially in contact with the plug to block the valve cavity from the outside. The inflatable safety valve has the advantages of low failure rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety valve, in particular to an inflatable safety valve. BACKGROUND

[0002] The inflatable safety valve is also called inflatable safety overflow valve, which is an automatic pressure relief device using compressed air as elastic element to limit the pressure of hydraulic system not to exceed the safety pressure of the system. In the related art, the top rod of the inflation joint overcomes the spring force and moves under the action of high-pressure gas, thereby connecting the inflation cavity with the outside. In the use process, the spring and the spring seat are prone to falling off, thereby causing the reset failure of the top rod. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0004] To this end, the embodiments of the present application provide an inflatable safety valve, which has the advantage of low failure rate.

[0005] The inflatable safety valve of the embodiments of the present application comprises a valve body having a valve cavity; a plugging assembly comprising a plug, a cap and a plugging piece, the plug being detachably connected to one end of the valve body at least in part, the cap being detachably connected to the plug, the plugging piece being movably connected to the plug between a first position and a second position, the plugging piece comprising a vent hole, in the first position, the plugging piece is spaced apart from the plug at least in part to communicate the valve cavity with the outside through the vent hole, in the second position, the plugging piece is in contact with the plug at least in part to block the valve cavity from the outside.

[0006] The inflatable safety valve of the embodiments of the present application can use high-pressure gas to act on the plugging piece to realize the moving reset function of the plugging piece, thereby avoiding the reset failure of the plugging piece caused by using the spring.

[0007] Therefore, the inflatable safety valve of the embodiments of the present application has the advantage of low failure rate.

[0008] In some embodiments, the plugging piece comprises a first section and a second section connected in sequence along the axial direction of the valve body, the first section is movably connected to the plug at least in part, the second section is arranged in the valve cavity, the cross-sectional area of the first section is smaller than that of the second section, in the first position, the second section is spaced apart from the plug at least in part, in the second position, the second section is in contact with the plug at least in part.

[0009] In some embodiments, the first section includes a peripheral wall surface and a first end surface away from the second section, one end of the peripheral wall surface is connected with the first end surface, the other end of the peripheral wall surface is connected with the second section, the vent hole includes a first hole section and a second hole section which are communicated with each other, the first hole section extends from the first end surface towards the second section, and the second hole section extends from the peripheral wall surface towards a center line of the first hole section.

[0010] In some embodiments, the plugging assembly further includes a limiting member which is arranged in the valve cavity and connected with one of the valve body and the plug, the limiting member and the second section are arranged in an axial direction of the valve body.

[0011] In some embodiments, the limiting member includes a base section and an extension section which are connected in sequence in the axial direction of the valve body, the base section is connected with the plug, the extension section is located at one end of the base section adjacent to the plugging member, the limiting member is provided with a first communication hole which penetrates the base section and the extension section in the axial direction of the valve body, and the first communication hole is communicated with the valve cavity.

[0012] In some embodiments, the plug includes an end section, a connecting section and an annular section which are connected in sequence in the axial direction of the valve body, the end section is located outside the valve cavity, the cap is arranged in the end section, the connecting section and the annular section are located in the valve cavity, a part of the plugging member is movably matched with the connecting section, another part of the plugging member is contactable and away from the connecting section, and the limiting member is located in the annular section.

[0013] In some embodiments, the other end of the valve body is provided with a liquid inlet, the valve body is provided with a liquid outlet, the liquid inlet and the liquid outlet are communicated with the valve cavity, the inflatable safety valve further includes a valve core which is arranged in the valve cavity and is movable in the axial direction of the valve body relative to the valve body, the valve core is located between the liquid inlet and the limiting member, the valve core is provided with a second communication hole, in the first position, the valve core blocks the liquid inlet and the liquid outlet, and in the second position, the second communication hole communicates the liquid inlet and the liquid outlet.

[0014] In some embodiments, the inflatable safety valve of the embodiments of the present application further includes a sealing ring, the valve cavity includes a first cavity section and a second cavity section which are communicated in sequence in the axial direction of the valve body, the cross-sectional area of the first cavity section is smaller than the cross-sectional area of the second cavity section, the first cavity section is adjacent to the liquid inlet compared with the second cavity section, and the sealing ring is arranged in the first cavity section and located between the inner peripheral surface of the valve body and the outer peripheral surface of the valve core.

[0015] In some embodiments, one of the inner circumferential surface of the valve body and the outer circumferential surface of the valve core is provided with a plurality of sealing grooves, and the sealing ring is correspondingly provided with a plurality of sealing grooves.

[0016] In some embodiments, the inflatable safety valve further comprises a plurality of pollution slots arranged on one of the inner circumferential surface of the valve body and the outer circumferential surface of the valve core. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the inflatable safety valve.

[0018] Figure 2 is Figure 1 is an enlarged schematic diagram of A shown in

[0019] REFERENCE SIGNS

[0020] Valve body 1; valve cavity 11; first cavity section 111; second cavity section 112; liquid inlet 12; liquid outlet 13;

[0021] Plugging assembly 2; plug 21; section head section 211; connecting section 212; annular section 213; plug cap 22; plugging piece 23; air vent hole 231; first hole section 2311; second hole section 2312; first section 232; circumferential wall surface 2321; first end surface 2322; second section 233; limiting piece 24; base section 241; extension section 242; first communication hole 243; air release hole 244;

[0022] Valve core 3; second communication hole 31; first blind hole 32; second blind hole 33;

[0023] Sealing ring 41; sealing groove 42;

[0024] Pollution slot 5. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0026] As Figure 1 and Figure 2 shown, the inflatable safety valve of the embodiments of the present application comprises a valve body 1 and a plugging assembly 2.

[0027] The valve body 1 has a valve cavity 11. The blocking assembly 2 comprises a blocking head 21, a blocking cap 22 and a blocking piece 23, the blocking head 21 is detachably connected with one end of the valve body 1 at least partially, the blocking cap 22 is detachably connected with the blocking head 21, the blocking piece 23 is movably connected with the blocking head 21 between a first position and a second position, the blocking piece 23 comprises a vent hole 231, in the first position, the blocking piece 23 is spaced apart from the blocking head 21 at least partially to communicate the valve cavity 11 with the outside through the vent hole 231, in the second position, the blocking piece 23 contacts with the blocking head 21 at least partially to block the valve cavity 11 from the outside.

[0028] Specifically, as shown in Figure 1 and Figure 2 , the left end of the blocking head 21 is detachably connected with the right end of the valve body 1 to facilitate replacement, wherein the blocking head 21 and the valve body 1 can be connected by clamping, of course, the blocking head 21 and the valve body 1 can also be connected by tight fit or other ways. Similarly, the blocking cap 22 is arranged at the right end of the blocking head 21 and the blocking cap 22 can be connected with the blocking head 21 by clamping to prevent impurities from the outside into the valve body 1 and also facilitate the installation and replacement of other components in the blocking assembly 2.

[0029] It can be understood that, as shown in Figure 1 and Figure 2 , the blocking piece 23 is movable along the left-right direction, i.e. the first position is located at the left side of the second position. In use, the blocking piece 23 is located at the second position, i.e. the left end of the blocking piece 23 contacts with the blocking head 21, the vent hole 231 is not communicated with the valve cavity 11, high-pressure gas is introduced into the right end of the blocking head 21, the blocking piece 23 moves to the left under the action of pressure, then the blocking piece 23 moves from the second position to the first position, the vent hole 231 communicates the valve cavity 11 with the outside, after stopping the introduction of high-pressure gas, the gas pressure at the right end of the blocking head 21 is reduced, while the high-pressure gas in the valve cavity 11 acts on the left end of the blocking piece 23, thereby making the blocking piece 23 move to the right, i.e. the blocking piece 23 moves from the first position to the second position, at this time, the blocking piece 23 blocks the spool 3 from the outside, thereby realizing the reset function of the blocking piece 23.

[0030] Therefore, the inflatable safety valve of the embodiment of the present application can utilize the high-pressure gas to act on the blocking piece 23, thereby realizing the reset function of the blocking piece 23 and avoiding the reset failure of the blocking piece 23 caused by the use of spring.

[0031] Therefore, the inflatable safety valve of the embodiment of the present application has the advantage of low failure rate.

[0032] In some embodiments, the blocking member 23 comprises a first section 232 and a second section 233 connected in sequence along the axial direction of the valve body 1, the first section 232 is movably connected with the plug 21 at least in part, and the second section 233 is arranged in the valve cavity 11, the cross-sectional area of the first section 232 is smaller than that of the second section 233, in the first position, the second section 233 is spaced apart from the plug 21 at least in part, and in the second position, the second section 233 is in contact with the plug 21 at least in part.

[0033] Specifically, as shown in Figure 1 and Figure 2 , the right end of the blocking member 23 forms the first section 232, and the left end of the blocking member 23 forms the second section 233, preferably, the first section 232 and the second section 233 are both cylindrical, and the plug 21 is provided with a through hole matched with the first section 232, and the first section 232 is movably arranged in the through hole at least in part, or the first section 232 is completely arranged in the through hole.

[0034] It can be understood that, as shown in Figure 1 and Figure 2 , the axial direction of the valve body 1 is consistent with the left-right direction, and the plane orthogonal to the axial direction of the valve body 1 cuts the first section 232 to form a cross section of the first section 232, and similarly, the plane cuts the second section 233 to form a cross section of the second section 233.

[0035] That is, when the second section 233 has a gap with the plug 21 and the vent hole 231 is communicated with the valve cavity 11, the blocking member 23 is in the first position. Since the cross-sectional area of the second section 233 is larger than that of the first section 232, when the second section 233 is in contact with the plug 21, the blocking member 23 can be blocked from moving to the right, at this time, the blocking member 23 is in the second position, and the blocking member 23 blocks the vent hole 231 from the valve cavity 11.

[0036] Optionally, an annular sealing gasket is arranged between the right end surface of the second section 233 and the plug 21, that is, the annular sealing gasket is arranged around the through hole on the plug 21, so that when the second section 233 is in contact with the plug 21, the sealing between the second section 233 and the plug 21 is increased.

[0037] Preferably, the right end surface of the second section 233 is provided with an annular groove, and the annular sealing gasket is arranged in the annular groove.

[0038] In some embodiments, the first section 232 comprises a peripheral wall surface 2321 and a first end surface 2322 away from the second section 233, one end of the peripheral wall surface 2321 is connected with the first end surface 2322, and the other end of the peripheral wall surface 2321 is connected with the second section 233, the vent hole 231 comprises a first hole section 2311 and a second hole section 2312 which are in communication with each other, the first hole section 2311 extends from the first end surface 2322 towards the second section 233, and the second hole section 2312 extends from the peripheral wall surface 2321 towards the center line of the first hole section 2311.

[0039] Specifically, as shown in the figure, the right end surface of the first section 232 forms the first end surface 2322, the right end of the peripheral wall surface 2321 is connected with the first end surface 2322, and the left end of the peripheral wall surface 2321 is connected with the second section 233. The first hole section 2311 extends from right to left and is in communication with the second hole section 2312. Figure 2

[0040] Optionally, the second hole section 2312 has a plurality of second hole sections 2312 which are arranged at intervals along the circumference of the first section 232, and one end of each of the plurality of second hole sections 2312 away from the peripheral wall surface 2321 is in communication with the first hole section 2311.

[0041] In some embodiments, the plugging assembly 2 further comprises a limiting member 24 which is arranged in the valve cavity 11 and connected with one of the valve body 1 and the plug 21, and the limiting member 24 and the second section 233 are arranged at intervals along the axial direction of the valve body 1.

[0042] Specifically, as shown in the figure, the limiting member 24 can be connected with the valve body 1, or the limiting member 24 can be connected with the plug 21, preferably, the limiting member 24 is connected with the plug 21, and the limiting member 24 and the plug 21 can be detachably connected through screws or bolts and the like, so as to facilitate replacement. Figure 2 It can be understood that the limiting member 24 is located on the left side of the second section 233, that is, the plugging member 23 moves from right to left until the second section 233 contacts the limiting member 24, and the limiting member 24 can limit the leftward movement of the plugging member 23, so as to prevent the plugging member 23 from moving excessively and separating from the plug 21. Preferably, when the second section 233 contacts the limiting member 24, the plugging member 23 is located at the first position.

[0043] In some embodiments, the limiting member 24 comprises a base section 241 and an extension section 242 which are connected in sequence along the axial direction of the valve body 1, the base section 241 is connected with the plug 21, the extension section 242 is located at one end of the base section 241 adjacent to the plugging member 23, the limiting member 24 is provided with a first communication hole 243 which penetrates the base section 241 and the extension section 242 along the axial direction of the valve body 1, and the first communication hole 243 is in communication with the valve cavity 11.

[0044]

[0045] ​​Specifically, as shown in Figure 2 The extension section 242 is located at the right side of the base section 241, and the first communication hole 243 penetrates the base section 241 and the extension section 242 along the left-right direction.

[0046] Preferably, the extension section 242 is provided with a plurality of air release holes 244 penetrating the peripheral wall surface 2321 of the extension section 242, and the plurality of air release holes 244 are arranged at intervals along the circumferential direction of the extension section 242.

[0047] It can be understood that when the blocking member 23 is located at the first position, the second section 233 is in contact with the extension section 242, and the valve core 3 can be in communication with the outside through the air release hole 244 to realize gas exchange.

[0048] In some embodiments, the plug 21 includes a head section, a connecting section 212 and an annular section 213 connected in sequence along the axial direction of the valve body 1, the head section is located outside the valve cavity 11, the cap 22 is arranged in the head section, the connecting section 212 and the annular section 213 are located in the valve cavity 11, a part of the blocking member 23 is movably matched with the connecting section 212, another part of the blocking member 23 is in contactable and away from the connecting section 212, and the limiting member 24 is located in the annular section 213.

[0049] Specifically, as shown in Figure 2 The annular section 213 is located at the left side of the connecting section 212, and the connecting section 212 and the annular section 213 are connected with the valve body 1 and arranged in the valve cavity 11. A part of the blocking member 23 (i.e. the first section 232) is connected with the connecting section 212, and another part of the blocking member 23 (i.e. the second section 233) is in contactable and away from the connecting section 212.

[0050] It can be understood that the connecting section 212 is provided with a through hole matched with the first section 232, the first section 232 of the blocking member 23 is matched in the through hole and is movable along the left-right direction. When the second section 233 of the blocking member 23 is in contact with the connecting section 212, the blocking member 23 is located at the second position, and when the second section 233 of the blocking member 23 is away from the connecting section 212 and in contact with the extension section 242, the blocking member 23 is located at the first position.

[0051] Preferably, the valve cavity 11 is cylindrical, and the annular section 213 is matched in the valve cavity 11. The base section 241 of the limiting member 24 is cylindrical, and the limiting member 24 is matched in the annular section 213.

[0052] In some embodiments, the other end of the valve body 1 is provided with an inlet 12 and a drain 13. Both the inlet 12 and the drain 13 are connected to the valve cavity 11. The inflatable safety valve also includes a valve core 3. The valve core 3 is disposed in the valve cavity 11 and is movable relative to the valve body 1 along the axial direction of the valve body 1. The valve core 3 is located between the inlet 12 and the limiting member 24. The valve core 3 is provided with a second connecting hole 31. In a first position, the valve core 3 blocks the inlet 12 and the drain 13. In a second position, the second connecting hole 31 connects the inlet 12 and the drain 13.

[0053] Specifically, such as Figure 1 As shown, the left end of the valve body 1 is provided with a liquid inlet 12. The axis of the liquid inlet 12 extends in the same direction as the left and right directions, and the axis of the liquid inlet 12 coincides with the axis of the valve body 1. External liquid can be introduced into the valve core 3 through the liquid inlet 12.

[0054] The valve core 3 includes a first blind hole 32 and a second blind hole 33. The first blind hole 32 is located on the left end face of the valve core 3 and communicates with the liquid inlet 12. The second blind hole 33 is located on the right end face of the valve core 3 and communicates with the valve cavity 11. That is, after the high-pressure gas enters the valve cavity 11, it can act on the second blind hole 33 to drive the valve core 3 to move to the left. Similarly, the high-pressure liquid entering through the liquid inlet 12 enters the first blind hole 32 and can drive the valve core 3 to move to the right.

[0055] It should be noted that, in use, when liquid is introduced into the inlet 12 of the pneumatic safety valve of this embodiment, the first blind hole 32 will move to the right under the action of liquid pressure until the second connecting hole 31 connects the inlet 12 and the outlet 13, and then the liquid will be discharged through the inlet 12, the valve chamber 11 and the outlet 13. When high-pressure gas is introduced into the sealing assembly 2, the sealing member 23 moves from the second position to the first position, and then the high-pressure gas enters the valve chamber 11. At this time, when the force on the second blind hole 33 of the valve core 3 is greater than the pressure on the first blind hole 32, the valve core 3 will move to the left until the valve core 3 blocks the outlet 13, and the discharge will stop.

[0056] In other words, when drainage is required, ensuring that the pressure on the first blind hole 32 is greater than the pressure on the second blind hole 33 will cause the valve core 3 to move to the right, connecting the inlet 12, the valve core 3, and the drain 13. When drainage needs to be stopped, high-pressure gas is introduced into the sealing assembly 2, so that the pressure on the first blind hole 32 is less than the pressure on the second blind hole 33, causing the valve core 3 to move to the left and blocking the inlet 12 and the drain 13.

[0057] In some embodiments, the inflatable safety valve according to the present application further comprises a sealing ring 41, the valve cavity 11 comprises a first cavity section 111 and a second cavity section 112 which are sequentially communicated along the axial direction of the valve body 1, the cross-sectional area of the first cavity section 111 is smaller than that of the second cavity section 112, the first cavity section 111 is adjacent to the liquid inlet 12 compared to the second cavity section 112, and the sealing ring 41 is arranged in the first cavity section 111 and located between the inner circumferential surface of the valve body 1 and the outer circumferential surface of the valve core 3.

[0058] Specifically, as shown in Figure 1 , the second cavity section 112 is located at the right side of the first cavity section 111, and the sealing ring 41 is arranged in the first cavity section 111 and located between the inner circumferential surface of the valve body 1 and the outer circumferential surface of the valve core 3, which can ensure the sealing performance during the movement of the valve core 3.

[0059] Preferably, one of the inner circumferential surface of the valve body 1 and the outer circumferential surface of the valve core 3 is provided with a sealing groove 42, and the sealing ring 41 is fitted in the sealing groove 42. There are multiple sealing grooves 42, which are arranged at intervals along the axial direction of the valve body 1. There are multiple sealing rings 41, which correspond to the multiple sealing grooves 42 one by one.

[0060] It can be understood that the inner circumferential surface of the valve body 1 is provided with the sealing groove 42, or the outer circumferential surface of the valve core 3 is provided with the sealing groove 42. Preferably, the inner circumferential surface of the valve body 1 is provided with the sealing groove 42, and the sealing ring 41 is arranged in the sealing groove 42, and the inner circumferential surface of the sealing ring 41 is in contact with the outer circumferential surface of the valve core 3 to improve the sealing performance.

[0061] In some embodiments, the inflatable safety valve according to the present application further comprises a pollution collection groove 5, which is arranged on one of the inner circumferential surface of the valve body 1 and the outer circumferential surface of the valve core 3. There are multiple pollution collection grooves 5, which are arranged at intervals along the axial direction of the valve body 1.

[0062] It can be understood that the inner circumferential surface of the valve body 1 is provided with the pollution collection groove 5, or the outer circumferential surface of the valve core 3 is provided with the pollution collection groove 5. Preferably, as shown in Figure 1 and Figure 2 , the inner circumferential surface of the valve body 1 is provided with the pollution collection groove 5. That is, during the movement of the valve core 3, part of the impurities in the liquid will accumulate on the outer circumferential surface of the valve core 3 following the movement of the valve core 3. The pollution collection groove 5 is used to collect the impurities accumulated on the outer circumferential surface of the valve core 3, so as to avoid too many impurities on the outer circumferential surface of the valve core 3, accelerate the wear of the sealing ring 41, and reduce the sealing effect of the sealing ring 41.

[0063] Preferably, one pollution collection groove 5 is located between two adjacent sealing grooves 42.

[0064] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0066] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0068] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising, but not limited to, any indicated features, integers, steps or components. It is also to be understood that the terminology "comprising" can be replaced by the terminology "consisting of" or "consisting essentially of" in some embodiments or examples.

[0069] Although the above-mentioned embodiments have been shown and described, it is to be understood that the above-mentioned embodiments are exemplary, and should not be understood as limiting the present disclosure, and the changes, modifications, replacements and variations of the above-mentioned embodiments made by those skilled in the art are within the protection scope of the present disclosure.

Claims

1. An inflatable relief valve characterized by, The utility model relates to a valve, comprising: a valve body having a valve cavity; a blocking assembly comprising a plug, a cap and a blocking piece, the plug being detachably connected to one end of the valve body, the cap being detachably connected to the plug, the blocking piece being movably connected to the plug between a first position and a second position, the blocking piece comprising a vent hole, in the first position, the blocking piece being at least partially spaced apart from the plug to communicate the valve cavity with the outside through the vent hole, in the second position, the blocking piece being at least partially in contact with the plug to block the valve cavity from the outside; the blocking piece comprising a first section and a second section connected in sequence along the axial direction of the valve body, the first section being movably connected to the plug, the second section being arranged in the valve cavity; the blocking assembly further comprising a limiting piece arranged in the valve cavity and connected to one of the valve body and the plug, the limiting piece and the second section being spaced apart along the axial direction of the valve body; the plug comprising a head section, a connecting section and an annular section connected in sequence along the axial direction of the valve body, the head section being located outside the valve cavity, the cap being arranged in the head section, the connecting section and the annular section being located in the valve cavity, a part of the blocking piece movably cooperating with the connecting section, another part of the blocking piece being contactable with and away from the connecting section, the limiting piece being located in the annular section.

2. The inflating relief valve according to claim 1, wherein the cross-sectional area of the first section being smaller than that of the second section, in the first position, the second section being at least partially spaced apart from the plug, in the second position, the second section being at least partially in contact with the plug.

3. The inflating relief valve according to claim 2, wherein the first section comprising a peripheral wall surface and a first end surface away from the second section, one end of the peripheral wall surface being connected to the first end surface, the other end of the peripheral wall surface being connected to the second section, the vent hole comprising a first hole section and a second hole section communicating with each other, the first hole section extending from the first end surface towards the second section, the second hole section extending from the peripheral wall surface towards the center line of the first hole section.

4. The inflating relief valve of claim 1, wherein, the limiting piece comprising a base section and an extension section connected in sequence along the axial direction of the valve body, the base section being connected to the plug, the extension section being located at one end of the base section adjacent to the blocking piece, the limiting piece being provided with a first communication hole penetrating through the base section and the extension section along the axial direction of the valve body, the first communication hole being in communication with the valve cavity.

5. The inflating relief valve of claim 1, wherein, the other end of the valve body being provided with a liquid inlet, the valve body being provided with a liquid outlet, the liquid inlet and the liquid outlet both being in communication with the valve cavity, the inflatable safety valve further comprising a valve core arranged in the valve cavity and being movable along the axial direction of the valve body relative to the valve body, the valve core being located between the liquid inlet and the limiting piece, the valve core being provided with a second communication hole, in the first position, the valve core blocking the liquid inlet and the liquid outlet, in the second position, the second communication hole communicating the liquid inlet and the liquid outlet.

6. The inflating relief valve according to claim 5, wherein The inflatable safety valve further comprises a sealing ring, the valve cavity comprises a first cavity section and a second cavity section which are communicated in sequence along the axial direction of the valve body, the cross-sectional area of the first cavity section is smaller than that of the second cavity section, the first cavity section is adjacent to the liquid inlet compared with the second cavity section, and the sealing ring is arranged in the first cavity section and located between the inner circumferential surface of the valve body and the outer circumferential surface of the valve core.

7. The inflating relief valve according to claim 6, wherein One of the inner circumferential surface of the valve body and the outer circumferential surface of the valve core is provided with a sealing groove, the sealing ring is fitted in the sealing groove, there are multiple sealing grooves which are arranged at intervals along the axial direction of the valve body, and there are multiple sealing rings which correspond to the multiple sealing grooves one by one.

8. An inflating relief valve according to any one of claims 6-7, characterized in that The inflatable safety valve further comprises a pollution-accepting groove, the pollution-accepting groove is arranged on one of the inner circumferential surface of the valve body and the outer circumferential surface of the valve core, and there are multiple pollution-accepting grooves which are arranged at intervals along the axial direction of the valve body.

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