Automatic pressure relief structure and valve

Abstract

The present invention discloses an automatic pressure relief structure and a valve. The automatic pressure relief structure includes a valve body, a retainer, a ball, a valve seat, a biasing member, a first sealing body and a second sealing body. The notch of the first groove of the first sealing body faces the middle cavity. When the middle cavity medium enters the first step and the first groove, the first and second extrusion forces are applied outward to the first lip and the second lip of the first groove respectively. The two extrusion forces are in the same direction as the second biasing force applied by the first elastic member to each lip, so that a sealed connection is formed between the valve body and the first step, which protects the second sealing body and prevents the middle cavity from being automatically depressurized at the second sealing body. Under the pressure of the middle cavity medium, the retainer can only be driven as a whole to move in a direction away from the ball, so that the valve seat is separated from the ball, and the middle cavity is automatically depressurized. Therefore, the automatic pressure relief range of the valve can be controlled when designing the valve.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to an automatic pressure relief structure and a valve. Background Art

[0002] Existing valve structure, such as Figure 1 As shown, it includes a valve body 1, a ball 3 and a holder 4, the holder is arranged between the ball and the valve body, and a valve seat 2 is arranged on the holder, and the valve seat can be sealed to the ball and separated from the ball; the side surface of the holder facing the ball is used as the first surface, and the side surface of the holder facing the valve body is used as the second surface, and a stepped step is arranged on the second surface, and the stepped step includes a first step and a second step, and the first step surface of the first step and the second step surface of the second step are stacked and distributed. A mounting groove is provided on the vertical surface of the first step surface, and a bias spring is provided in the mounting groove. One end of the bias spring is installed in the mounting groove, and the other end extends out of the mounting groove and is provided on the valve body, so as to apply a biasing force toward the ball to the fixture, so that when the valve body is in a closed state, the valve seat is tightly held on the ball; a sealing body is provided on the second step surface of the second step, and the sealing body includes an annular body, a first lip and a second lip formed on one side end surface of the annular body, a groove is formed between the two lips and the annular body, and a first elastic member is provided in the groove, the notch of the groove faces away from the ball, and the first elastic member will apply a pre-tightening force outward to the two lips.

[0003] In order to realize the automatic pressure relief function of the middle cavity, the area of ​​the first side surface of the valve in the radial direction of the valve body is S1, and the area of ​​the vertical surface of the first step is S2. Assuming that the pressure of the medium in the middle cavity is P1 and the preload force of the bias spring is F1, it is necessary to satisfy P1S1>P1S2+F1. That is, when the pressure of the medium in the middle cavity increases, the medium in the middle cavity generates a force on both the first side surface and the second side surface. As long as the force of the medium in the middle cavity on the first side surface is greater than the force of the medium in the middle cavity on the second side surface and overcomes the preload force of the bias spring, the medium in the middle cavity will drive the retainer to Figure 1 The middle part moves away from the ball, driving the valve seat to separate from the ball, releasing the pressure of the medium in the middle cavity. After the medium pressure is released, the retainer moves toward the ball under the action of the bias spring to achieve re-sealing. During this process, the first lip and the second lip of the sealing body always remain in a sealing state with the valve body and the second step surface of the retainer respectively.

[0004] However, in the above-mentioned automatic pressure relief structure, when the pressure in the middle cavity is too high instantly, the middle cavity medium quickly passes through the first step and the second step to the right side of the sealing body, and enters between the first lip and the valve body, and enters between the second lip and the second step surface, exerting an extrusion force toward the groove on the first lip or the second lip, thereby separating the first lip from the valve body, and the second lip from the second step surface, and automatically releasing the pressure in the middle cavity at the sealing body, during which the valve seat and the ball remain sealed. After the middle cavity is automatically relieved of pressure, the first lip and the second lip are reset. This automatic pressure relief method for the middle cavity damages the first lip and the second lip, causing poor sealing of the sealing body to the valve body and the retainer.

[0005] That is, in the above-mentioned automatic pressure relief structure, there are two ways for the middle cavity to automatically relieve pressure. When the pressure of the middle cavity medium increases slowly, the pressure is automatically relieved from between the ball and the valve seat; when the pressure of the middle cavity medium increases rapidly, the pressure is automatically relieved from the first lip and the second lip of the sealing body. On the one hand, the lips of the sealing body are damaged, affecting the sealing between the retainer and the valve body. Since there are two automatic pressure relief methods, it is difficult to control the range of automatic pressure relief of the valve when designing the valve. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is that the existing automatic pressure relief structure damages the sealing body, affects the sealing between the retainer and the valve body, and it is difficult to control the range of automatic pressure relief of the valve when designing the valve.

[0007] To this end, the present invention provides an automatic pressure relief structure, comprising a valve body, a retainer, a ball and a valve seat; wherein the retainer is located between the valve body and the ball;

[0008] The two side surfaces of the holder facing the ball and the valve body are respectively a first surface and a second surface; the valve seat is fixed on the first surface; the second surface is provided with a first step and a second step in a stepped distribution, the first step is closer to the middle cavity of the valve body than the second step; the radial area S1 of the first step is smaller than the area S2 of the first surface;

[0009] A biasing member, disposed between the first step and the valve body, for applying a first biasing force toward the central cavity of the valve body to the retainer;

[0010] A first sealing body is provided on the first step; the first sealing body comprises a first annular body, a first groove provided on the first annular body and facing the middle cavity of the valve body, and a first elastic member installed in the first groove, two groove side walls of the first groove respectively serve as a first lip and a second lip, and the first lip and the second lip are respectively tightly abutted against the first step surface of the valve body and the first step by the second biasing force of the first elastic member;

[0011] The second sealing body is arranged on the second step and is used for sealingly connecting the valve body and the second step.

[0012] Optionally, in the above-mentioned automatic pressure relief structure, the first elastic member is in a first U-shape or a first V-shape, the closed end of the first U-shape or the first V-shape abuts against the bottom of the first groove, and the two side walls of the first U-shape or the first V-shape are respectively attached to the inner wall surfaces of the first lip and the second lip, applying a second bias force to the respective corresponding lips.

[0013] Optionally, the above-mentioned automatic pressure relief structure further includes a first support member;

[0014] The first support member has a first connecting part and a second connecting part. The first connecting part is inserted into the first U-shaped or first V-shaped inner cavity and abuts against the closed end. The second connecting part is perpendicular to the first connecting part and fixed on the end of the first connecting part outside the socket of the first groove.

[0015] Optionally, in the above-mentioned automatic pressure relief structure, a third step is provided on the valve body, wherein the third step corresponds to the first step;

[0016] The first lip portion of the first sealing body abuts against the third step surface of the third step, and the second lip portion abuts against the first step surface of the first step.

[0017] Optionally, in the automatic pressure relief structure, a fourth step is provided on the valve body, the fourth step is arranged in a stepped manner with the third step, and corresponds to the second step;

[0018] The two side walls of the second sealing body are respectively sealed against the fourth step surface of the fourth step and the second step surface of the second step.

[0019] Optionally, in the above-mentioned automatic pressure relief structure, the second sealing body includes a second annular body, a second groove provided on the second annular body and facing the valve body central cavity, and a second elastic member installed in the second groove, the two groove side walls of the second groove serve as a third lip and a fourth lip, respectively, the third lip and the fourth lip are tightly abutted against the fourth step surface of the fourth step and the second step surface of the second step respectively under the third bias force of the second elastic member; the notch of the second groove faces away from the valve body central cavity.

[0020] Optionally, in the above-mentioned automatic pressure relief structure, the second elastic member is in a second U-shape or a second V-shape, the closed end of the second U-shape or the second V-shape abuts against the groove bottom of the second groove, and the two side walls of the second U-shape or the second V-shape are respectively attached to the inner wall surfaces of the third lip and the fourth lip, applying a second biasing force to the respective corresponding lips;

[0021] It also includes a second support member and a first retaining ring; the second support member has a third connecting part and a fourth connecting part, the third connecting part is inserted into the second U-shaped or second V-shaped inner cavity and abuts on the closed end, and the fourth connecting part is perpendicular to the third connecting part and fixed on the end of the third connecting part outside the socket of the second groove; the first retaining ring is fixed on the step surface of the second step and blocked on the outer wall surface of the fourth connecting part; the outer wall surface of the groove bottom of the second sealing body abuts on the radial vertical surface of the second step.

[0022] Optionally, in the above-mentioned automatic pressure relief structure, a fifth step is further provided on the valve body, and the fifth step and the fourth step are distributed on both sides of the third step; the radial outer end face of the retainer abuts against the step surface of the fifth step, and the two ends of the biasing member are respectively arranged on the radial vertical surface of the fifth step and the radial vertical surface of the first step.

[0023] Optionally, in the above-mentioned automatic pressure relief structure, a first mounting groove is provided on the radial vertical surface of the first step, the notch of the first mounting groove faces the valve body, one end of the biasing member is embedded in the first mounting groove, and the other end extends out of the first mounting groove to abut against the valve body.

[0024] The present invention provides a valve, comprising

[0025] Any of the automatic pressure relief structures described above.

[0026] The technical solution of the present invention has the following advantages:

[0027] 1. The automatic pressure relief structure provided by the present invention comprises a valve body, a retainer, a ball, a valve seat, a biasing member, a first sealing member and a second sealing member; the first sealing member is arranged on the first step, and the notch of the first groove of the first sealing member faces the middle cavity. When the medium pressure in the middle cavity of the valve increases instantly, the medium pressure in the middle cavity enters the first step and the first groove, and applies a first extrusion force and a second extrusion force outward to the first lip and the second lip of the first groove respectively. The two extrusion forces are in the same direction as the second biasing force applied by the first elastic member to each lip, so that the first lip and the second lip are further sealed on the first step surface of the valve body and the first step respectively, and a sealing connection is further formed between the valve body and the first step, so that the medium in the middle cavity will not enter the second step, and will not apply a force to the second sealing member on the second step. The second sealing member always maintains a sealing connection between the valve body and the second step, protects the second sealing member, and does not automatically relieve the pressure of the middle cavity at the second sealing member. At the same time, the medium in the middle cavity applies pressure to the radial area S1 of the first step and the radial area S2 of the first surface respectively. Since S1<S2, assuming that the pressure of the medium in the middle cavity is P1, and the preload force of the bias spring is F1, since P1×S2>P1×S1+F1 is satisfied, then under the pressure of the medium in the middle cavity, the retainer can only be driven as a whole to move away from the sphere, so that the valve seat is separated from the sphere, realizing automatic pressure relief of the middle cavity. Therefore, the automatic pressure relief range of the valve can be controlled when designing the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of an automatic pressure relief structure in the prior art;

[0030] Figure 2 This is a structural schematic diagram of the automatic pressure relief of the valve at A in Example 2 of the present application, which is partially enlarged;

[0031] Figure 3 for Figure 2 A partial enlarged schematic diagram of the automatic pressure relief structure;

[0032] Figure 4 is a schematic diagram of the structure of the valve in Example 2;

[0033] Description of reference numerals:

[0034] 1-valve body; 11-flow channel; 12-middle cavity; 13-third step; 14-fourth step; 15-fifth step; 2-valve seat; 3-ball; 4-fixture; 41-first step; 42-second step; 5-biasing member; 6-first sealing body; 61-first groove; 62-first lip; 63-second lip; 64-first elastic member; 7-second sealing body; 71-second groove; 72-fourth lip; 73-third lip; 8-valve stem; 9-first supporting member; 91-first connecting part; 92-second connecting part; 10-second supporting member; 101-third connecting part; 102-fourth connecting part; 103-first retaining ring. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Example 1

[0040] This embodiment provides an automatic pressure relief structure, such as Figure 2 , Figure 3 and Figure 4As shown, it includes a valve body 1, a retainer 4, a ball 3, a valve seat 2, a biasing member 5, a first sealing body 6 and a second sealing body 7; wherein the retainer 4 is located between the valve body 1 and the ball 3;

[0041] The two side surfaces of the retainer 4 facing the ball 3 and the valve body 1 are respectively the first surface and the second surface; the valve seat 2 is fixed on the first surface; the second surface is provided with a first step 41 and a second step 42 in a stepped distribution, and the first step 41 is closer to the middle cavity 12 of the valve body 1 than the second step 42; the radial area S1 of the first step 41 is smaller than the radial area S2 of the first surface; the biasing member 5 is provided between the first step 41 and the valve body 1, and is used to apply a first biasing force toward the middle cavity 12 of the valve body 1 to the retainer 4;

[0042] The first sealing body 6 is arranged on the first step 41; the first sealing body 6 includes a first annular body, the first annular body is provided with a first groove 61 facing the middle cavity 12 of the valve body 1, and a first elastic member 64 is installed in the first groove 61, the two groove side walls of the first groove 61 serve as the first lip 62 and the second lip 63 respectively, the first lip 62 and the second lip 63 are tightly abutted against the first step surface of the valve body 1 and the first step 41 respectively under the second biasing force of the first elastic member 64; the second sealing body 7 is arranged on the second step surface of the second step 42, and is used to seal the valve body 1 and the second step 42.

[0043] In this automatic pressure relief structure, a first sealing body 6 is arranged on the first step 41. Since the notch of the first groove 61 of the first sealing body 6 faces the middle cavity 12, when the medium pressure in the valve middle cavity 12 increases instantly, the middle cavity medium flows into the gap between the first step 41 and the valve body, and enters the first groove 61, and applies a first extrusion force and a second extrusion force outward to the first lip 62 and the second lip 63 respectively. The two extrusion forces are in the same direction as the second biasing force applied to each lip by the first elastic member 64, so that the first lip 62 and the second lip 63 are further sealed on the valve body 1 and the first step surface of the first step 41 respectively, and the sealing connection between the valve body 1 and the first step 41 is further strengthened. Then, the middle cavity medium will not flow into the gap between the second step 42 and the valve body, and will not apply a force to the second sealing body 7 on the second step 42. The second sealing body 7 always maintains the sealing connection between the valve body 1 and the second step 42, protects the second sealing body 7, and does not automatically relieve the pressure of the middle cavity 12 at the second sealing body 7.

[0044] At the same time, the middle cavity medium applies pressure to the radial area S1 of the first step 41 and the radial area S2 of the first surface respectively. Since S1<S2, assuming that the middle cavity medium pressure is P1, and the preload force of the bias spring is F1, since P1×S2>P1×S1+F1 is satisfied, then under the pressure of the middle cavity medium, the retainer 4 can only be driven as a whole to move away from the sphere 3, so that the valve seat 2 is separated from the sphere 3, and the middle cavity 12 is automatically depressurized. When designing the valve, the automatic depressurization range of the valve can be controlled.

[0045] Preferably, the first elastic member 64 is in a first U-shape or a first V-shape, the closed end of the first U-shape or the first V-shape abuts against the bottom of the second groove 71, and the two side walls of the first U-shape or the first V-shape are respectively fitted on the inner wall surfaces of the first lip 62 and the second lip 63, and a second biasing force is applied to the corresponding lips, so that the two side walls of the first elastic member 64 apply a second biasing force to the first lip 62 and the second lip 63 respectively, ensuring that the first lip 62 and the second lip 63 are respectively sealed against the valve body 1 and the first step surface of the first step 41. Further preferably, the first elastic member 64 is a spring or a spring.

[0046] Preferably, if Figure 3 As shown, it also includes a first support member 9; the first support member 9 has a first connection portion 91 and a second connection portion 92, the first connection portion 91 is inserted into the first U-shaped or first V-shaped inner cavity and abuts on the closed end, and the second connection portion 92 is perpendicular to the first connection portion 91 and fixed on the end of the first connection portion 91 outside the socket of the first groove. The first connection portion 91 is located in the first U-shaped or V-shaped inner cavity, and further supports and limits the first lip and the second lip, preventing the first lip and the second lip from deforming too much when approaching the first U-shaped or first V-shaped inner cavity.

[0047] like Figure 2 As shown, a third step 13 is provided on the valve body 1, wherein the third step 13 corresponds to the first step 41; the first lip 62 of the first sealing body 6 abuts against the third step 13 surface of the third step 13, and the second lip 63 abuts against the first step surface of the first step 41, and the third step 13 and the first step 41 are arranged relative to each other, which facilitates the installation of the first sealing body 6.

[0048] Preferably, a fourth step 14 is provided on the valve body 1, and the fourth step 14 is distributed in a stepped manner with the third step 13 and corresponds to the second step 42; the two side walls of the second sealing body 7 are respectively sealed against the step surface of the fourth step 14 and the second step surface of the second step 42, so as to facilitate the installation of the second sealing body 7.

[0049] The second sealing body 7 may be a sealing ring or other sealing structures. For example, the second sealing body 7 has the same structure as the first sealing body 6. Specifically, Figure 2 and Figure 3 As shown, the second sealing body 7 includes a second annular body, on which is provided a second groove 71 facing the middle cavity 12 of the valve body 1, and a second elastic member installed in the second groove 71, and two groove side walls of the second groove 71 serve as a third lip 73 and a fourth lip 72 respectively, and the third lip 73 and the fourth lip 72 are tightly abutted against the fourth step surface of the fourth step 14 and the second step surface of the second step 42 respectively by the third biasing force of the second elastic member, thereby realizing a sealed connection between the fourth step surface of the fourth step 14 of the valve body 1 and the second step surface of the second step 42.

[0050] The notch of the second groove 71 of the second sealing body 7 can face the middle cavity 12 of the valve body 1, and can also face away from the middle cavity 12 of the valve body 1. Since the first sealing body 6 is affected by the middle cavity medium, the sealing performance is further improved, and the middle cavity medium does not exert any effect on the second sealing body 7. At this time, the second sealing body 7 only needs to play a sealing role, and the notch can face the middle cavity 12 or face away from the middle cavity 12. It is only necessary for the two lips to play the role of sealing the fourth step surface 14 of the fourth step 14 of the valve body 1 and the second step surface 42 under the biasing force of the second elastic member.

[0051] Preferably, the second elastic member is in a second U-shape or a second V-shape, the closed end of the second U-shape or the second V-shape abuts against the bottom of the second groove, and the two side walls of the second U-shape or the second V-shape are respectively attached to the inner wall surfaces of the third lip 73 and the fourth lip 72, applying a second bias force to the corresponding lips.

[0052] like Figure 2 and Figure 3 As shown, it also includes a second support member 10 and a first retaining ring 103; the second support member 10 has a third connecting portion 101 and a fourth connecting portion 102, the third connecting portion 101 is inserted into the second U-shaped or second V-shaped inner cavity and abuts on the closed end, and the fourth connecting portion 102 is perpendicular to the third connecting portion and fixed on the end of the third connecting portion outside the socket of the second groove; the first retaining ring 103 is fixed on the step surface of the second step and blocked on the outer wall surface of the fourth connecting portion, and the outer wall surface of the groove bottom of the second sealing body abuts on the radial vertical surface of the second step.

[0053] The third connecting portion similarly limits the deformation of the third lip and the fourth lip toward the second U-shaped or second V-shaped inner cavity; the setting of the first retaining ring limits the second sealing body on the fixture, and it will not have relative movement relative to the fixture. When the second sealing body is subjected to force, it will be transmitted to the fixture.

[0054] Preferably, a fifth step 15 is further provided on the valve body 1, and the fifth step 15 and the fourth step 14 are distributed on both sides of the third step 13; the radial outer end face of the retainer 4 abuts against the step surface of the fifth step 15, and the two ends of the biasing member 5 are respectively arranged on the radial vertical surface of the fifth step 15 and the radial vertical surface of the first step 41. The setting of the fifth step 15 facilitates the installation of the biasing member 5.

[0055] Further preferably, a first mounting groove is provided on the radial vertical surface of the first step, the groove opening of the first mounting groove faces the valve body 1, one end of the biasing member 5 is embedded in the first mounting groove, and the other end extends out of the first mounting groove to abut against the radial vertical surface of the fifth step of the valve body 1.

[0056] There are many ways to install the valve seat 2 on the holder 4. For example, the valve seat 2 is welded on the first surface of the holder 4, or Figure 2 As shown, a second mounting groove is provided on the first surface, the notch of the second mounting groove faces the ball 3, one end of the valve seat 2 is embedded in the second mounting groove, and the other end extends out of the second mounting groove and serves as a sealing surface, which can be sealed or separated from the ball 3.

[0057] Example 2

[0058] This embodiment provides a valve, such as Figure 3 As shown, it includes any one of the automatic pressure relief structures provided in Example 1.

[0059] The valve body 1 has a flow channel 11 extending along its axial direction and a middle cavity 12 perpendicular to the flow channel 11; the bottom of the valve stem 8 extends into the middle cavity 12 and is fixedly connected to the ball 3, and the top of the valve body 1 extends out of the middle cavity 12 and is connected to the driving mechanism. The driving mechanism drives the valve stem 8 to rotate, thereby driving the ball 3 to rotate, thereby realizing the closing or opening of the ball 3 and the valve seat 2.

[0060] The valve of this embodiment adopts the automatic pressure relief structure provided in Example 1, which can protect the second sealing body 7. The range of the self-pressure relief of the valve is controllable, thereby extending the service life of the valve.

[0061] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An automatic pressure relief structure, characterized in that: It comprises a valve body, a retainer, a ball and a valve seat; wherein the retainer is located between the valve body and the ball; The two side surfaces of the holder facing the ball and the valve body are respectively a first surface and a second surface; the valve seat is fixed on the first surface; the second surface is provided with a first step and a second step in a stepped distribution, the first step is closer to the middle cavity of the valve body than the second step; the radial area S1 of the first step is smaller than the area S2 of the first surface; A biasing member, disposed between the first step and the valve body, for applying a first biasing force toward the central cavity of the valve body to the retainer; A first sealing body is provided on the first step; the first sealing body comprises a first annular body, a first groove provided on the first annular body and facing the middle cavity of the valve body, and a first elastic member installed in the first groove, two groove side walls of the first groove respectively serve as a first lip and a second lip, and the first lip and the second lip are respectively tightly abutted against the first step surface of the valve body and the first step by the second biasing force of the first elastic member; a second sealing body, disposed on the second step, and used for sealingly connecting the valve body and the second step; The first elastic member is in a first U-shape or a first V-shape, the closed end of the first U-shape or the first V-shape abuts against the bottom of the first groove, and the two side walls of the first U-shape or the first V-shape are respectively attached to the inner wall surfaces of the first lip and the second lip, applying a second biasing force to the corresponding lips; The automatic pressure relief structure further includes a first support member; The first support member has a first connection portion and a second connection portion, the first connection portion is inserted into the first U-shaped or first V-shaped inner cavity and abuts against the closed end, and the second connection portion is perpendicular to the first connection portion and fixed to the end of the first connection portion located outside the socket of the first groove; The second sealing body comprises a second annular body, a second groove provided on the second annular body and facing the middle cavity of the valve body, and a second elastic member installed in the second groove, two groove side walls of the second groove respectively serve as a third lip and a fourth lip, and the third lip and the fourth lip are respectively tightly abutted against the fourth step surface of the fourth step and the second step surface of the second step by the third biasing force of the second elastic member; the notch of the second groove faces away from the middle cavity of the valve body; The second elastic member is in a second U-shape or a second V-shape, the closed end of the second U-shape or the second V-shape abuts against the bottom of the second groove, and the two side walls of the second U-shape or the second V-shape are respectively attached to the inner wall surfaces of the third lip and the fourth lip, applying a second bias force to the corresponding lips.

2. The automatic pressure relief structure according to claim 1, characterized in that: The valve body is provided with a third step, wherein the third step corresponds to the first step; The first lip portion of the first sealing body abuts against the third step surface of the third step, and the second lip portion abuts against the first step surface of the first step.

3. The automatic pressure relief structure according to claim 2, characterized in that: The valve body is provided with a fourth step, the fourth step is distributed in a stepped manner with the third step, and corresponds to the second step; The two side walls of the second sealing body are respectively sealed against the fourth step surface of the fourth step and the second step surface of the second step; The automatic pressure relief structure also includes a second support member and a first retaining ring; the second support member has a third connecting part and a fourth connecting part, the third connecting part is inserted into the second U-shaped or second V-shaped inner cavity and abuts on the closed end, and the fourth connecting part is perpendicular to the third connecting part and fixed on the end of the third connecting part outside the socket of the second groove; the first retaining ring is fixed on the step surface of the second step and blocked on the outer wall surface of the fourth connecting part; the outer wall surface of the groove bottom of the second sealing body abuts on the radial vertical surface of the second step.

4. The automatic pressure relief structure according to any one of claims 1 to 3, characterized in that: A fifth step is also provided on the valve body, and the fifth step and the fourth step are distributed on both sides of the third step; the radial outer end surface of the retainer abuts against the step surface of the fifth step, and the two ends of the biasing member are respectively arranged on the radial vertical surface of the fifth step and the radial vertical surface of the first step.

5. The automatic pressure relief structure according to any one of claims 1 to 3, characterized in that: A first mounting groove is provided on the radial vertical surface of the first step, the notch of the first mounting groove faces the valve body, one end of the biasing member is embedded in the first mounting groove, and the other end extends out of the first mounting groove to abut against the valve body.

6. A valve, characterized in that: include The automatic pressure relief structure according to any one of claims 1 to 5.

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