CN218992414U - Double ball valve with multiple pressure relief function - Google Patents

Abstract

The utility model belongs to the technical field of double ball valves, and discloses a double ball valve with a multiple pressure relief function, wherein an upper ball body is rotatably arranged on a double ball valve body, a cavity is formed between the upper ball body and the double ball valve body, an upper ball inner channel is formed in the upper ball body, a built-in one-way pressure relief valve is fixedly arranged on the upper ball body, the built-in one-way pressure relief valve is configured in such a way that a medium in the cavity can enter the upper ball inner channel through the built-in one-way pressure relief valve, a first elastic piece penetrates through a mounting groove of the valve body, two ends of a valve seat pressure relief structure are respectively abutted against the first elastic piece and the upper ball body, an upstream channel is formed in the double ball valve body, two ends of the upstream channel can be respectively communicated with an onshore LNG storage tank and the upper ball inner channel, the valve seat pressure relief structure slides on the valve body to have a first position and a second position, and when the valve seat pressure relief structure is positioned at the first position, the cavity is communicated with the upstream channel; when the valve seat pressure relief structure is in the second position, the cavity is not in communication with the upstream passage. Can be fast to the cavity pressure release, the security is high.

Description

Double ball valve with multiple pressure relief function

Technical Field

The utility model relates to the technical field of double ball valves, in particular to a double ball valve with a multiple pressure relief function.

Background

The low-temperature double ball valve is mainly applied to an Emergency Release System (ERS) of an LNG loading and unloading arm, and the LNG loading and unloading arm is a conveying device between an LNG carrier and an LNG receiving station. The upstream channel of the low-temperature double ball valve is connected with the land LNG storage tank, the downstream channel of the low-temperature double ball valve is connected with the LNG carrier, and liquefied natural gas is conveyed to the land LNG storage tank by the LNG carrier. When the test or meet emergency, the low temperature double ball valve is closed, the cavity between the upper sphere of the low temperature double ball valve and the valve body is closed, liquefied natural gas can remain in the cavity, and because the liquefied natural gas medium has volatile property, the liquefied natural gas can cause the pressure in the cavity to rise sharply in the closed cavity, so that serious potential safety hazard exists. The low temperature double ball valve generally adopts the disk seat pressure release structure, current disk seat pressure release structure includes spring and disk seat, the disk seat slides and wears to locate the valve body of low temperature double ball valve, the both ends of disk seat butt spring and last spheroid respectively, pressure in the cavity is too big, liquefied natural gas medium in the cavity promotes the disk seat and keeps away from the spheroid, the clearance inflow upstream channel between disk seat and the last spheroid in the cavity, thereby pressure release is carried out to the cavity, however, there is uncertainty through current disk seat pressure release structure pressure release, unable quantization through the calculation, if the pressure in the cavity is too big, current disk seat pressure release structure is insufficient for accomplishing the pressure release, still there is the potential safety hazard.

Disclosure of Invention

The utility model aims to provide a double ball valve with multiple pressure relief functions, so as to solve the problems that the pressure relief through the existing valve seat pressure relief structure has uncertainty, can not be quantified through calculation, and potential safety hazards still exist if the pressure in a cavity is too large, and the existing valve seat pressure relief structure is insufficient to finish the pressure relief.

To achieve the purpose, the utility model adopts the following technical scheme:

possess multiple pressure release function's two ball valves, include:

a double ball valve body;

the upper ball body is rotatably arranged on the double-ball valve body, a cavity is formed between the upper ball body and the double-ball valve body, and an upper ball inner channel is formed in the upper ball body;

the built-in one-way pressure release valve is fixedly arranged on the upper ball body, two ends of the built-in one-way pressure release valve are respectively communicated with the cavity and the upper ball inner channel, and the built-in one-way pressure release valve is configured in such a way that a medium in the cavity can enter the upper ball inner channel through the built-in one-way pressure release valve;

the valve seat pressure relief structure is arranged in the mounting groove of the valve body in a penetrating mode, two ends of the valve seat pressure relief structure are respectively abutted to the first elastic piece and the upper ball body, the double-ball valve body is provided with an upstream channel, two ends of the upstream channel can be respectively communicated with the land LNG storage tank and the upper ball inner channel, the valve seat pressure relief structure is arranged in the valve body in a sliding mode and is provided with a first position and a second position, and when the valve seat pressure relief structure is arranged in the first position, the cavity is communicated with the upstream channel; when the valve seat relief structure is in the second position, the cavity is not in communication with the upstream passage.

As a preferred scheme of the double ball valve with the multiple pressure relief function, the built-in one-way pressure relief valve comprises a first pressure relief valve body, a first valve core and a second elastic piece, wherein the first pressure relief valve body is provided with a first channel and a second channel, the first channel is communicated with the cavity, the second channel is communicated with the upper ball inner channel, the first valve core is slidably arranged in the second channel in a penetrating manner, the second elastic piece is located in the second channel, two ends of the second elastic piece are respectively abutted to the first valve core and the first pressure relief valve body, and the first valve core can be communicated or disconnected with the first channel and the second channel.

As a preferred scheme of the double ball valve with the multiple pressure relief function, the first pressure relief valve body comprises a first valve body, a first valve seat and a first spring seat, the first valve seat and the first spring seat are fixedly arranged on the first valve body in a penetrating mode, the first valve seat is located between the first valve seat and the first valve body, a part of the first channel is arranged on the first valve body, another part of the first channel is arranged on the first valve seat, the second channel is arranged on the first spring seat, two ends of the second elastic piece are respectively connected with the first valve core and the first spring seat in a supporting mode, and the first valve core can be connected with the first valve seat in a supporting mode.

As a preferred scheme of the double ball valve with the multiple pressure relief function, the double ball valve with the multiple pressure relief function further comprises a lower ball body and an external one-way pressure relief valve, the lower ball body is rotatably arranged on the valve body, the upper ball body and the lower ball body are arranged at intervals, a middle cavity is formed between the upper ball body, the lower ball body and the double ball valve body, an upstream channel is formed in the double ball valve body, two ends of the upstream channel can be respectively communicated with an land LNG storage tank and an upper ball inner channel, the valve body is provided with a first diversion hole and a second diversion hole, the first diversion hole is communicated with the middle cavity, the second diversion hole is communicated with the upstream channel, two ends of the external one-way pressure relief valve are respectively communicated with the first diversion hole and the second diversion hole, and the external one-way pressure relief valve is configured in such a way that a medium in the middle cavity can enter the upstream channel through the external one-way valve.

As a preferred scheme of the double ball valve with the multiple pressure relief function, the external one-way pressure relief valve comprises a second pressure relief valve body, a second valve core and a third elastic piece, wherein the second pressure relief valve body is provided with a third channel and a fourth channel, the third channel is communicated with the first diversion hole, the fourth channel is communicated with the second diversion hole, the second valve core is slidably arranged in the fourth channel in a penetrating manner, the third elastic piece is arranged in the fourth channel, two ends of the third elastic piece are respectively abutted to the second valve core and the second pressure relief valve body, and the second valve core can be communicated or disconnected with the third channel and the fourth channel.

As a preferable scheme of the double ball valve with multiple pressure relief functions, the second pressure relief valve body comprises a second valve body, a second valve seat and a second spring seat, the second valve seat and the second spring seat are fixedly arranged on the second valve body in a penetrating mode, the second valve seat is located between the second spring seat and the second valve body, a part of the third channel is arranged on the second valve body, another part of the third channel is arranged on the second valve seat, the fourth channel is arranged on the second spring seat, two ends of the third elastic piece are respectively abutted to the second valve core and the second spring seat, and the second valve core can be abutted to the second valve seat.

As a preferred scheme of the double ball valve with the multiple pressure relief function, the double ball valve with the multiple pressure relief function further comprises a first pipeline, the external one-way pressure relief valve further comprises a first clamping sleeve connector, the first clamping sleeve connector is fixedly arranged on the second valve body, one end of the first pipeline is communicated with the first diversion hole, and the other end of the first pipeline is communicated with the first clamping sleeve connector.

As a preferred scheme of the double ball valve with the multiple pressure relief function, the double ball valve with the multiple pressure relief function further comprises a second pipeline, the external one-way pressure relief valve further comprises a second clamping sleeve joint and a rotating joint, the rotating joint is provided with internal threads, the outer wall of the second valve body is provided with external threads, the internal threads are in threaded connection with the external threads, the second clamping sleeve joint is fixedly arranged on the rotating joint, one end of the second pipeline is communicated with the second diversion hole, and the other end of the second pipeline is communicated with the second clamping sleeve joint.

As a preferable scheme of the double ball valve with multiple pressure relief functions, the second valve core is spherical.

As a preferred scheme of the double ball valve with the multiple pressure relief function, the valve seat pressure relief structure comprises a pressure relief valve seat, a one-way general plug sealing ring and a metal gasket, wherein the third elastic piece, the metal gasket, the pressure relief valve seat and the upper ball body are sequentially abutted, a sealing groove is formed between the pressure relief valve seat and the metal gasket, the one-way general plug sealing ring is located in the sealing groove, and the one-way general plug sealing ring is located between the pressure relief valve seat and the valve body.

The utility model has the beneficial effects that:

the utility model provides a double ball valve with multiple pressure relief functions, which is provided with a built-in one-way pressure relief valve, a valve seat pressure relief structure and a first elastic piece, wherein the built-in one-way pressure relief valve is configured in such a way that a medium in a cavity can enter an upper ball inner channel through the built-in one-way pressure relief valve; when the valve seat pressure relief structure is in the second position, the cavity is not in communication with the upstream passage. This possess two ball valves of multiple pressure release function, when the pressure in the cavity is too big, medium in the cavity promotes disk seat pressure release structure and moves to first position by the second position, compresses first elastic component, medium in the cavity flows into the upstream passageway from the clearance between disk seat pressure release structure and the last spheroid to, medium in the cavity also gets into the ball passageway in through built-in one-way relief valve, thereby can be fast to the cavity pressure release, prevent that the pressure in the cavity from being too big and taking place dangerous, improved the safety in utilization of two ball valves that possess multiple pressure release function.

Drawings

FIG. 1 is a schematic diagram of a dual ball valve with multiple pressure relief according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a built-in one-way relief valve with a double ball valve having multiple relief functions according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of an external one-way pressure relief valve with a double ball valve having multiple pressure relief functions according to an embodiment of the present utility model;

fig. 4 is an enlarged view at a in fig. 1.

In the figure:

1. a valve body; 101. an upstream channel; 102. a first deflector aperture; 103. a second deflector aperture;

2. an upper sphere; 21. an upper ball inner channel;

3. a lower sphere;

4. a cavity;

5. a middle cavity;

6. a one-way pressure release valve is arranged in the valve body; 61. a first pressure relief valve body; 62. a first valve core; 63. a second elastic member; 64. a first channel; 65. a second channel; 611. a first valve body; 612. a first valve seat; 613. a first spring seat;

7. an external one-way pressure release valve; 71. the second pressure relief valve body; 72. a second valve core; 73. a third elastic member; 74. a third channel; 75. a fourth channel; 76. a first ferrule joint; 77. a rotary joint; 78. a second ferrule fitting; 711. a second valve body; 712. a second valve seat; 713. a second spring seat;

8. a first elastic member;

9. a valve seat pressure relief structure; 91. a pressure relief valve seat; 92. a one-way flood-plug one-way ring; 93. a metal gasket;

10. a second pipeline;

11. a first pipeline.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The utility model provides a double ball valve with multiple pressure relief functions, as shown in figures 1-4, the double ball valve with multiple pressure relief functions comprises a double ball valve body 1, an upper ball 2, a built-in one-way pressure relief valve 6, a valve seat pressure relief structure 9 and a first elastic piece 8, wherein the upper ball 2 is rotatably arranged on the double ball valve body 1, a cavity 4 is formed between the upper ball 2 and the double ball valve body 1, the upper ball 2 is provided with an upper ball internal channel 21, the built-in one-way pressure relief valve 6 is fixedly arranged on the upper ball 2, two ends of the built-in one-way pressure relief valve 6 are respectively communicated with the cavity 4 and the upper ball internal channel 21, the built-in one-way pressure relief valve 6 is configured in such a way that a medium in the cavity 4 can enter the upper ball internal channel 21 through the built-in one-way pressure relief valve 6, the first elastic piece 8 penetrates through a mounting groove of the valve body 1, the valve seat pressure relief structure 9 is slidably arranged on the valve body 1, two ends of the valve seat pressure relief structure 9 are respectively abutted against the first elastic piece 8 and the upper ball 2, the double ball valve body 1 is provided with an upstream channel 101, two ends of the upstream channel 101 can be respectively communicated with an land LNG storage tank and the upstream channel 21, when the valve seat structure 9 is slidably arranged at a first position and a second position and a valve seat 9 is located at a first position and a second position and is communicated with the upstream channel 101; when the valve seat relief structure 9 is in the second position, the chamber 4 is not in communication with the upstream channel 101.

This possess dual ball valve of multiple pressure release function, when the pressure in the cavity 4 is too big, medium in the cavity 4 promotes disk seat relief structure 9 and moves to first position by the second position, compress first elastic component 8, medium in the cavity 4 flows into upstream channel 101 from the clearance between disk seat relief structure 9 and the last spheroid 2, and, medium in the cavity 4 also gets into through built-in one-way relief valve 6 and goes up ball inner channel 21, thereby can be fast to cavity 4 pressure release, prevent that the pressure in the cavity 4 is too big and take place danger, the safety in utilization of dual ball valve that possesses multiple pressure release function has been improved.

Alternatively, as shown in fig. 2, the built-in one-way relief valve 6 includes a first relief valve body 61, a first valve core 62 and a second elastic member 63, where the first relief valve body 61 is provided with a first channel 64 and a second channel 65, the first channel 64 is communicated with the cavity 4, the second channel 65 is communicated with the upper ball internal channel 21, the first valve core 62 is slidably arranged in the second channel 65, the second elastic member 63 is located in the second channel 65, two ends of the second elastic member 63 respectively abut against the first valve core 62 and the first relief valve body 61, and the first valve core 62 can be communicated with or disconnected from the first channel 64 and the second channel 65. When the pressure in the cavity 4 is too large, the medium in the cavity 4 passes through the first channel 64 to push the first valve core 62 to move in a direction away from the cavity 4, and the second elastic piece 63 is compressed, so that the first channel 64 and the second channel 65 are communicated, and the medium enters the second channel 65 from the first channel 64 and then enters the ball feeding inner channel 21 from the second channel 65.

Optionally, the first relief valve body 61 includes a first valve body 611, a first valve seat 612 and a first spring seat 613, where the first valve seat 612 and the first spring seat 613 are both fixedly disposed on the first valve body 611, the first valve seat 612 is located between the first spring seat 613 and the first valve body 611, a portion of the first channel 64 is disposed on the first valve body 611, another portion of the first channel 64 is disposed on the first valve seat 612, the second channel 65 is disposed on the first spring seat 613, two ends of the second elastic member 63 respectively abut against the first valve core 62 and the first spring seat 613, and the first valve core 62 can abut against the first valve seat 612. Optionally, the first spool 62 is in the form of a sphere. When the first valve spool 62 abuts against the first valve seat 612, the first passage 64 and the second passage 65 are disconnected, so that the cavity 4 is not communicated with the upper ball inner passage 21; when the first spool 62 is away from the first valve seat 612, the first passage 64 communicates with the second passage 65, so that the chamber 4 communicates with the ball-on-ball passage 21.

Optionally, as shown in fig. 1 and fig. 3, the dual ball valve with multiple pressure relief function further includes a lower ball 3 and an external one-way pressure relief valve 7, the lower ball 3 is rotatably disposed on the valve body 1, the upper ball 2 and the lower ball 3 are disposed at intervals, a middle cavity 5 is formed between the upper ball 2, the lower ball 3 and the dual ball valve body 1, the dual ball valve body 1 is provided with an upstream channel 101, two ends of the upstream channel 101 can be respectively communicated with an onshore LNG storage tank and an upper ball inner channel 21, the valve body 1 is provided with a first diversion hole 102 and a second diversion hole 103, the first diversion hole 102 is communicated with the middle cavity 5, the second diversion hole 103 is communicated with the upstream channel 101, two ends of the external one-way pressure relief valve 7 are respectively communicated with the first diversion hole 102 and the second diversion hole 103, and the external one-way pressure relief valve 7 is configured such that medium in the middle cavity 5 can enter the upstream channel 101 through the external one-way pressure relief valve 7. When the pressure in the middle cavity 5 is overlarge, the medium in the middle cavity 5 sequentially passes through the first diversion hole 102, the external one-way pressure release valve 7 and the second diversion hole 103 and enters the upstream channel 101, so that the pressure in the middle cavity 5 is released. The external one-way relief valve 7 is low in manufacturing cost and convenient to replace, and can be replaced selectively according to the requirement of the magnitude of the relief pressure, so that the double ball valve with the multiple relief functions is economical and practical, and the service life of the double ball valve with the multiple relief functions is greatly prolonged.

Optionally, the external one-way pressure release valve 7 includes a second pressure release valve body 71, a second valve core 72 and a third elastic member 73, the second pressure release valve body 71 is provided with a third channel 74 and a fourth channel 75, the third channel 74 is communicated with the first diversion hole 102, the fourth channel 75 is communicated with the second diversion hole 103, the second valve core 72 is slidably arranged in the fourth channel 75 in a penetrating manner, the third elastic member 73 is located in the fourth channel 75, two ends of the third elastic member 73 are respectively abutted against the second valve core 72 and the second pressure release valve body 71, and the second valve core 72 can be communicated with or disconnected from the third channel 74 and the fourth channel 75. When the pressure in the middle chamber 5 is excessively high, the medium in the middle chamber 5 pushes the second valve core 72 to move away from the third channel 74 through the first diversion hole 102 and the third channel 74, so that the third channel 74 is communicated with the fourth channel 75, and the medium enters the fourth channel 75 from the third channel 74 and further enters the upstream channel 101 from the fourth channel 75 through the second diversion hole 103.

Optionally, the second relief valve body 71 includes a second valve body 711, a second valve seat 712 and a second spring seat 713, where the second valve seat 712 and the second spring seat 713 are both fixedly disposed on the second valve body 711, the second valve seat 712 is located between the second spring seat 713 and the second valve body 711, a part of the third channel 74 is disposed on the second valve body 711, another part of the third channel 74 is disposed on the second valve seat 712, the fourth channel 75 is disposed on the second spring seat 713, and two ends of the third elastic member 73 respectively abut against the second valve core 72 and the second spring seat 713, and the second valve core 72 can abut against the second valve seat 712. Optionally, the second spool 72 is spherical. When the second spool 72 abuts against the second valve seat 712, the third passage 74 and the fourth passage 75 are disconnected, and the intermediate chamber 5 and the upstream passage 101 are not communicated; when the second spool 72 is separated from the second valve seat 712, the third passage 74 and the fourth passage 75 communicate, and the intermediate chamber 5 and the upstream passage 101 communicate. Alternatively, the first elastic member 8, the second elastic member 63, and the third elastic member 73 are all springs.

Optionally, the double ball valve with multiple pressure relief functions further comprises a first pipeline 11, the external one-way pressure relief valve 7 further comprises a first clamping sleeve joint 76, the first clamping sleeve joint 76 is fixedly arranged on the second valve body 711, one end of the first pipeline 11 is communicated with the first diversion hole 102, and the other end of the first pipeline 11 is communicated with the first clamping sleeve joint 76. The first ferrule fitting 76 is used to connect the external one-way pressure relief valve 7 with the first line 11.

Optionally, the double ball valve with multiple pressure relief functions further comprises a second pipeline 10, the external one-way pressure relief valve 7 further comprises a second clamping sleeve joint 78 and a rotary joint 77, the rotary joint 77 is provided with internal threads, the outer wall of the second valve body 711 is provided with external threads, the internal threads are in threaded connection with the external threads, the second clamping sleeve joint 78 is fixedly arranged on the rotary joint 77, one end of the second pipeline 10 is communicated with the second diversion hole 103, and the other end of the second pipeline 10 is communicated with the second clamping sleeve joint 78. The second ferrule fitting 78 is used to connect the external one-way pressure relief valve 7 with the second line 10.

Optionally, as shown in fig. 4, the valve seat pressure release structure 9 includes a pressure release valve seat 91, a unidirectional plug sealing ring 92 and a metal gasket 93, where the first elastic element 8, the metal gasket 93, the pressure release valve seat 91 and the upper ball 2 are sequentially abutted, a sealing groove is formed between the pressure release valve seat 91 and the metal gasket 93, the unidirectional plug sealing ring 92 is located in the sealing groove, and the unidirectional plug sealing ring 92 is located between the pressure release valve seat 91 and the valve body 1. When the pressure in the cavity 4 is too large, the medium in the cavity 4 can flow into the upstream channel 101 from the gap between the pressure relief valve seat 91 and the upper ball 2, and can also flow into the upstream channel 101 from the gap between the one-way universal plug seal 92 and the valve body 1 through the gap between the pressure relief valve seat 91 and the metal gasket 93.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. Possess multiple pressure release function's double ball valve, its characterized in that includes:

a double ball valve body (1);

the upper ball body (2) is rotatably arranged on the double-ball valve body (1), a cavity (4) is formed between the upper ball body (2) and the double-ball valve body (1), and the upper ball body (2) is provided with an upper ball inner channel (21);

the built-in one-way pressure release valve (6), the built-in one-way pressure release valve (6) is fixedly arranged on the upper ball body (2), two ends of the built-in one-way pressure release valve (6) are respectively communicated with the cavity (4) and the upper ball inner channel (21), and the built-in one-way pressure release valve (6) is configured in such a way that a medium in the cavity (4) can enter the upper ball inner channel (21) through the built-in one-way pressure release valve (6);

the valve seat pressure relief structure (9) and the first elastic piece (8), the first elastic piece (8) is arranged in the mounting groove of the valve body (1) in a penetrating mode, the valve seat pressure relief structure (9) is arranged in the valve body (1) in a penetrating mode in a sliding mode, two ends of the valve seat pressure relief structure (9) are respectively abutted to the first elastic piece (8) and the upper ball body (2), the double-ball valve body (1) is provided with an upstream channel (101), two ends of the upstream channel (101) can be respectively communicated with an LNG (liquefied natural gas) storage tank and the upper ball internal channel (21), the valve seat pressure relief structure (9) is arranged in the valve body (1) in a first position and a second position in a sliding mode, and when the valve seat pressure relief structure (9) is arranged in the first position, the cavity (4) is communicated with the upstream channel (101); when the valve seat relief structure (9) is in the second position, the cavity (4) is not in communication with the upstream channel (101).

2. The double ball valve with the multiple pressure relief functions according to claim 1, characterized in that the built-in one-way pressure relief valve (6) comprises a first pressure relief valve body (61), a first valve core (62) and a second elastic piece (63), the first pressure relief valve body (61) is provided with a first channel (64) and a second channel (65), the first channel (64) is communicated with the cavity (4), the second channel (65) is communicated with the upper ball inner channel (21), the first valve core (62) is slidably arranged in the second channel (65), the second elastic piece (63) is located in the second channel (65), two ends of the second elastic piece (63) are respectively abutted against the first valve core (62) and the first pressure relief valve body (61), and the first valve core (62) can be communicated with or disconnected from the first channel (64) and the second channel (65).

3. The double ball valve with multiple pressure relief functions according to claim 2, wherein the first pressure relief valve body (61) comprises a first valve body (611), a first valve seat (612) and a first spring seat (613), the first valve seat (612) and the first spring seat (613) are both fixedly arranged on the first valve body (611), the first valve seat (612) is located between the first spring seat (613) and the first valve body (611), a part of the first channel (64) is arranged on the first valve body (611), another part of the first channel (64) is arranged on the first valve seat (612), the second channel (65) is arranged on the first spring seat (613), two ends of the second elastic piece (63) are respectively abutted with the first valve core (62) and the first spring seat (613), and the first valve core (62) can be abutted with the first valve seat (612).

4. The double ball valve with multiple pressure relief functions according to claim 1, further comprising a lower ball body (3) and an external one-way pressure relief valve (7), wherein the lower ball body (3) is rotatably arranged on the valve body (1), the upper ball body (2) and the lower ball body (3) are arranged at intervals, a middle cavity (5) is formed between the upper ball body (2), the lower ball body (3) and the double ball valve body (1), the valve body (1) is provided with a first diversion hole (102) and a second diversion hole (103), the first diversion hole (102) is communicated with the middle cavity (5), the second diversion hole (103) is communicated with the upstream channel (101), two ends of the external one-way pressure relief valve (7) are respectively communicated with the first diversion hole (102) and the second diversion hole (103), and the external one-way valve (7) is configured so that a medium in the middle cavity (5) can enter the upstream channel (101) through the external one-way valve (7).

5. The double ball valve with multiple pressure relief functions according to claim 4, characterized in that the external one-way pressure relief valve (7) comprises a second pressure relief valve body (71), a second valve core (72) and a third elastic piece (73), the second pressure relief valve body (71) is provided with a third channel (74) and a fourth channel (75), the third channel (74) is communicated with the first diversion hole (102), the fourth channel (75) is communicated with the second diversion hole (103), the second valve core (72) is slidably arranged in the fourth channel (75), the third elastic piece (73) is located in the fourth channel (75), two ends of the third elastic piece (73) are respectively abutted against the second valve core (72) and the second pressure relief valve body (71), and the second valve core (72) can be communicated with or disconnected from the third channel (74) and the fourth channel (75).

6. The double ball valve with multiple pressure relief functions according to claim 5, wherein the second pressure relief valve body (71) comprises a second valve body (711), a second valve seat (712) and a second spring seat (713), the second valve seat (712) and the second spring seat (713) are both fixedly arranged on the second valve body (711), the second valve seat (712) is located between the second spring seat (713) and the second valve body (711), a part of the third channel (74) is arranged on the second valve body (711), another part of the third channel (74) is arranged on the second valve seat (712), the fourth channel (75) is arranged on the second spring seat (713), two ends of the third elastic piece (73) are respectively abutted with the second valve core (72) and the second spring seat (713), and the second valve core (72) can be abutted with the second valve seat (712).

7. The double ball valve with the multiple pressure relief function according to claim 6, further comprising a first pipeline (11), wherein the external one-way pressure relief valve (7) further comprises a first clamping sleeve joint (76), the first clamping sleeve joint (76) is fixedly arranged on the second valve body (711), one end of the first pipeline (11) is communicated with the first diversion hole (102), and the other end of the first pipeline (11) is communicated with the first clamping sleeve joint (76).

8. The double ball valve with multiple pressure relief functions according to claim 6, wherein the double ball valve with multiple pressure relief functions further comprises a second pipeline (10), the external one-way pressure relief valve (7) further comprises a second clamping sleeve joint (78) and a rotary joint (77), the rotary joint (77) is provided with internal threads, the outer wall of the second valve body (711) is provided with external threads, the internal threads are in threaded connection with the external threads, the second clamping sleeve joint (78) is fixedly arranged on the rotary joint (77), one end of the second pipeline (10) is communicated with the second diversion hole (103), and the other end of the second pipeline (10) is communicated with the second clamping sleeve joint (78).

9. The double ball valve with multiple pressure relief functions according to claim 5, wherein the second valve element (72) is spherical.

10. The double ball valve with multiple pressure relief functions according to any one of claims 1-9, characterized in that the valve seat pressure relief structure (9) comprises a pressure relief valve seat (91), a one-way universal plug sealing ring (92) and a metal gasket (93), the first elastic piece (8), the metal gasket (93), the pressure relief valve seat (91) and the upper ball body (2) are sequentially abutted, a sealing groove is formed between the pressure relief valve seat (91) and the metal gasket (93), the one-way universal plug sealing ring (92) is located in the sealing groove, and the one-way universal plug sealing ring (92) is located between the pressure relief valve seat (91) and the valve body (1).

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