Pressure relief valve and filling equipment

Abstract

The present invention discloses a pressure relief valve and filling equipment, which belongs to the field of filling technology. The pressure relief valve includes a valve seat, a throttle member, a valve core and a diaphragm valve. The valve seat has a first channel, a second channel and a mounting groove. The two ports of the first channel are respectively located on the surface of the valve seat, and the other port of the second channel is located on the groove wall of the mounting groove. The throttle member is installed in the mounting groove and has an inner cavity. The inner cavity can be directly connected to the second channel. The pressure relief valve also includes a pressure relief channel connecting the second channel and the inner cavity. The valve core is movably installed in the inner cavity. The connection area between the second channel and the inner cavity can be adjusted by the valve core. The diaphragm valve is installed on the valve seat and has a first valve channel connected to the first channel and a second valve channel connected to the inner cavity. The pressure relief valve and filling equipment provided by the present invention have little effect on the flow rate of the cleaning fluid before and after flowing through the pressure relief valve, thereby improving the cleanliness of the pipeline connected to the pressure relief valve and preventing the occurrence of sanitary blind spots.

Description

Technical Field

[0001] The present invention relates to the field of filling technology, in particular to a pressure relief valve and filling equipment. Background Art

[0002] In the filling industry, when filling carbonated beverages, the bottle is generally filled with low-pressure gas before filling. The filling machine is generally equipped with a pressure relief valve. When the bottle is filled to the set capacity, the pressure relief valve needs to be opened to release the pressure in the bottle.

[0003] In the prior art, a pressure relief valve typically consists of a base, a shut-off valve, and a throttle plate. The throttle plate is located at the outlet of the shut-off valve and has a small hole of approximately 1 mm. This hole is used to control the speed of exhaust during pressure relief, thereby preventing excessive foaming of the beverage in the bottle during pressure relief.

[0004] However, when cleaning the pipeline connected to the pressure relief valve, since a throttle plate is provided inside the pressure relief valve, the small holes on the throttle plate will seriously affect the flow rate of the cleaning fluid in the pipelines before and after the throttle plate, making it difficult to clean the pipeline connected to the pressure relief valve, resulting in a sanitary blind spot. Summary of the Invention

[0005] The purpose of the present invention is to provide a pressure relief valve and filling equipment, which have little effect on the flow velocity of the cleaning liquid before and after flowing through the pressure relief valve, improve the cleanliness of the pipeline connected to the pressure relief valve, and prevent the occurrence of sanitary blind spots.

[0006] As conceived above, the technical solution adopted by the present invention is:

[0007] Pressure relief valve, including:

[0008] a valve seat, the valve seat having a first channel, a second channel, and a mounting groove, wherein two ports of the first channel are respectively located on a surface of the valve seat, one port of the second channel is located on the surface of the valve seat, and the other port of the second channel is located on a groove wall of the mounting groove;

[0009] a throttle member installed in the installation groove, the throttle member having an inner cavity, the inner cavity being arranged opposite to the other port of the second channel and capable of being directly connected to the second channel, and the pressure relief valve further comprising a pressure relief channel connecting the second channel and the inner cavity;

[0010] a valve core movably mounted in the inner cavity, and capable of adjusting a communication area between the second channel and the inner cavity;

[0011] A diaphragm valve is installed on the valve seat and has a first valve channel and a second valve channel that are connected. The first valve channel is connected to the first channel, and the second valve channel is connected to the inner cavity.

[0012] Optionally, the throttling member has a stopper, which is fixed in the inner cavity and arranged close to the second valve channel, and is used to limit the valve core.

[0013] Optionally, the inner cavity includes a first section, a second section and a third section with gradually increasing inner diameters, the first section is connected to the second valve channel, and the inner diameter of the first section is greater than or equal to the inner diameter of the second valve channel, the stop block is arranged in the second section, the valve core is located in the third section, and the third section is connected to the second channel.

[0014] Optionally, a first sealing ring is further included, which is installed between the throttling member and the bottom wall of the installation groove. The valve core can be pressed against the first sealing ring to make the communication area between the second channel and the inner cavity zero.

[0015] Optionally, the valve core is a sphere, and the valve core is pressed against the first sealing ring by its own gravity.

[0016] Optionally, the pressure relief channel includes a first pressure relief hole, an annular hole and a second pressure relief hole, the outer wall of the throttling member is provided with a groove, and the groove wall of the groove and the groove wall of the mounting groove constitute the annular hole, the first pressure relief hole is opened in the throttling member and the first pressure relief hole connects the annular hole and the inner cavity, the second pressure relief hole is opened in the valve seat, and the second pressure relief hole connects the annular hole and the second channel.

[0017] Optionally, the aperture of the first pressure relief hole is smaller than that of the second pressure relief hole, the aperture of the second pressure relief hole is smaller than the inner diameter of the second channel, and the inner diameter of the second channel is smaller than or equal to the inner diameter of the inner cavity.

[0018] Optionally, a second sealing ring installed in the annular hole is further included, and the second sealing ring is used to seal the gap between the throttling member and the groove side wall of the installation groove.

[0019] Optionally, the first channel includes a first sub-channel and a second sub-channel that are vertically connected, a port of the first sub-channel is located on the surface of the valve seat, the second sub-channel is connected to the first valve channel, the second channel includes a third sub-channel and a fourth sub-channel that are vertically connected, a port of the third sub-channel is located on the surface of the valve seat, a port of the fourth sub-channel is located on the groove wall of the mounting groove and can be connected to the inner cavity, and the axis of the first sub-channel is collinear with the axis of the third sub-channel.

[0020] The filling equipment includes a filling machine and the above-mentioned pressure relief valve, the filling machine includes a filling pipeline, the pressure relief valve is connected in series to the filling pipeline, and the first channel and the second channel are respectively connected to the filling pipeline.

[0021] Beneficial effects of the present invention:

[0022] The pressure relief valve and filling equipment provided by the present invention have an inner cavity in the throttling member, and a valve core is provided in the inner cavity. When there is no need to clean the filling pipeline, the valve core blocks the other port of the second channel, so that the fluid in the inner cavity cannot flow directly into the second channel through the other port of the second channel, but flows to the second channel through the pressure relief channel. When it is necessary to clean the filling pipeline, the valve core does not block the other port of the second channel, so that the cleaning fluid in the second channel can flow directly into the inner cavity through the other port of the second channel, so that the flow rate of the cleaning fluid is basically not affected by the pressure relief channel, and can meet the flow rate required for cleaning, thereby improving the cleanliness of the cleaning filling pipeline and preventing the occurrence of sanitary blind spots. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional schematic diagram of a pressure relief valve provided by an embodiment of the present invention;

[0024] Figure 2 This invention Figure 1 An enlarged schematic diagram of point A is shown;

[0025] Figure 3 is a cross-sectional schematic diagram of a valve seat provided by an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the connection between the pressure relief valve, filling pipeline, filling head and bottle provided in an embodiment of the present invention.

[0027] In the picture:

[0028] 1. Valve seat; 11. First channel; 111. First sub-channel; 112. Second sub-channel; 12. Second channel; 121. Third sub-channel; 122. Fourth sub-channel; 13. Mounting groove; 14. Pressure relief channel; 141. Second pressure relief hole; 15. Annular hole; 2. Throttle; 21. Inner cavity; 211. First section; 212. Second section; 213. Third section; 22. Stopper; 23. First pressure relief hole; 3. Valve core; 4. Diaphragm valve; 41. First valve channel; 42. Second valve channel; 5. First sealing ring; 6. Second sealing ring; 10. Filling pipeline; 20. Filling head; 100. Bottle. DETAILED DESCRIPTION

[0029] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the drawings only show portions relevant to the present invention, not all of them.

[0030] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0033] This embodiment provides a pressure relief valve that has little effect on the flow rate of the cleaning fluid before and after the pressure relief valve, thereby improving the cleanliness of the pipeline connected to the pressure relief valve and preventing the occurrence of sanitary blind spots.

[0034] like Figure 1 As shown, the pressure relief valve includes a valve seat 1, a throttling member 2, a valve core 3 and a diaphragm valve 4.

[0035] The valve seat 1 has a first channel 11, a second channel 12, and a mounting groove 13. The first channel 11 and the second channel 12 are independent of each other, and the two ports of the first channel 11 are respectively located on the surface of the valve seat 1. In some embodiments, one port of the first channel 11 is located on the side wall of the valve seat 1, and the other port is located on the top wall of the valve seat 1. One port of the second channel 12 is located on the surface of the valve seat 1, specifically on the side wall of the valve seat 1, and the other port of the second channel 12 is located on the wall of the mounting groove 13. In other words, the second channel 12 can directly communicate with the mounting groove 13.

[0036] like Figure 2 and Figure 3 As shown, the throttle member 2 is fixedly installed in the mounting groove 13. The throttle member 2 also has an inner cavity 21, which is arranged opposite to the other end of the second channel 12 and can be directly connected to the second channel 12. That is, there is no other channel between the inner cavity 21 and the other end of the second channel 12. In addition, the pressure relief valve also includes a pressure relief channel 14 connecting the second channel 12 and the inner cavity 21. The pressure relief channel 14 is used to relieve the pressure in the bottle when the bottle is filled to a set capacity.

[0037] Please continue to see Figure 2 The valve core 3 is movably mounted in the inner cavity 21. Specifically, the valve core 3 moves up and down along the axial direction of the throttling member 2. The valve core 3 can adjust the communication area between the second channel 12 and the inner cavity 21. When the communication area between the second channel 12 and the inner cavity 21 is zero, the fluid in the inner cavity 21 cannot flow directly into the second channel 12, and the fluid in the second channel 12 cannot flow directly into the inner cavity 21.

[0038] The diaphragm valve 4 is fixedly mounted on the valve seat 1. Specifically, the diaphragm valve 4 is fixedly mounted on the top wall of the valve seat 1. The diaphragm valve 4 has a first valve channel 41 and a second valve channel 42 that are connected. The first valve channel 41 is connected to the first channel 11, and the second valve channel 42 is connected to the inner cavity 21.

[0039] When pressure within the bottle needs to be relieved, the diaphragm valve 4 is in the open position. At this point, the fluid (gas-liquid, liquid, or a gas-liquid mixture) within the bottle 100 flows from the filling head 20 through the filling line 10 into the first channel 11, and then through the first channel 11 and the first valve channel 41 into the diaphragm valve 4. The fluid in the diaphragm valve 4 flows into the inner cavity 21 through the second valve channel 42, and then into the second channel 12 through the pressure relief channel 14, achieving pressure relief. When the filling line 10 needs to be cleaned, a cleaning fluid with a certain pressure enters the second channel 12. The vast majority of the cleaning fluid in the second channel 12 pushes the valve core 3 to move within the inner cavity 21 and flows directly into the inner cavity 21 through another port of the second channel 12. A small portion of the cleaning fluid in the second channel 12 flows into the inner cavity 21 through the pressure relief channel 14. The cleaning fluid in the inner cavity 21 flows into the second valve channel 42, and then flows into the first channel 11 and the filling line 10 through the first valve channel 41, achieving cleaning of the filling line and the pressure relief valve.

[0040] The pressure relief valve provided in this embodiment has an inner cavity 21 in the throttling member 2, and a valve core 3 is provided in the inner cavity 21. When there is no need to clean the filling pipeline 10, the valve core 3 blocks the other port of the second channel 12, so that the fluid in the inner cavity 21 cannot flow directly into the second channel 12 through the other port of the second channel 12, but flows into the second channel 12 through the pressure relief channel 14. When it is necessary to clean the filling pipeline 10, the valve core 3 does not block the other port of the second channel 12, so that the cleaning liquid in the second channel 12 can flow directly into the inner cavity 21 through the other port of the second channel 12, so that the flow rate of the cleaning liquid is basically not affected by the pressure relief channel 14, and can meet the flow rate required for cleaning, thereby improving the cleanliness of the cleaning filling pipeline 10 and preventing the occurrence of sanitary blind spots.

[0041] Optionally, the throttle member 2 includes a stopper 22, which is fixedly disposed within the inner cavity 21 and positioned adjacent to the second valve passage 42. The stopper 22 serves to limit the valve core 3 to prevent it from moving out of the inner cavity 21. Specifically, the space enclosed by the stopper 22 is smaller than the cross-sectional dimensions of the valve core 3. In some embodiments, multiple stoppers 22 are provided, spaced apart circumferentially around the throttle member 2 to minimize the impact of the stoppers 22 on the flow area. In other embodiments, the stopper 22 is annular. The longitudinal cross-section of the stopper 22 may be trapezoidal, square, or the like, although this embodiment is not limiting.

[0042] In this embodiment, please continue to refer to Figure 2The inner cavity 21 includes a first section 211, a second section 212, and a third section 213, the inner diameters of which gradually increase and are connected in sequence. The first section 211 is connected to the second valve channel 42, and the inner diameter of the first section 211 is greater than or equal to the inner diameter of the second valve channel 42, so that when the cleaning liquid in the inner cavity 21 flows into the second valve channel 42, the flow area does not change much. The block 22 is set in the second section 212, the valve core 3 is located in the third section 213, and the third section 213 is connected to the second channel 12. By setting the inner cavity 21 in a stepped shape, the inner cavity 21 can be smoothly connected to the second valve channel 42, and the volume of the inner cavity 21 can be larger.

[0043] Alternatively, as Figure 2 As shown, the pressure relief valve further includes a first sealing ring 5. The first sealing ring 5 is mounted between the throttle member 2 and the bottom wall of the mounting groove 13. In some embodiments, the first sealing ring 5 is located within the inner cavity 21 and contacts the bottom wall of the mounting groove 13. The first sealing ring 5 is used to seal the gap between the throttle member 2 and the valve seat 1. The valve core 3 can abut against the first sealing ring 5, so that the communication area between the second channel 12 and the inner cavity 21 is zero. This situation is used to relieve pressure from the bottle 100. When the valve core 3 is away from the first sealing ring 5, the communication area between the second channel 12 and the inner cavity 21 is non-zero. This situation is used to clean the filling pipeline 10.

[0044] In some embodiments, the valve core 3 is a sphere made of stainless steel or other corrosion-resistant materials. Furthermore, the valve core 3 presses against the first sealing ring 5 by its own weight, so that the fluid in the inner cavity 21 does not flow directly into the second channel 12 through the other port of the second channel 12, but instead flows into the second channel 12 through the pressure relief channel 14. Alternatively, the valve core 3 is a solid sphere.

[0045] In this embodiment, please continue to refer to Figure 2The pressure relief channel 14 includes a first pressure relief hole 23, an annular hole 15 and a second pressure relief hole 141 which are connected in sequence. Among them, the outer wall of the throttling member 2 is provided with a groove, and the groove wall of the groove and the groove wall of the mounting groove 13 constitute the above-mentioned annular hole 15. Specifically, the throttling member 2 is composed of two cylindrical bodies with different diameters. The diameter of the cylindrical body located above is larger than the diameter of the cylindrical body located below, and the end face of the cylindrical body with a smaller diameter and the cylindrical body with a larger diameter form the above-mentioned groove. The diameter of the cylindrical body with a larger diameter is equal to the inner diameter of the mounting groove 13, so that the two can be sealed and connected. The first pressure relief hole 23 is opened in the throttling member 2 and the first pressure relief hole connects the annular hole 15 and the inner cavity 21. In some embodiments, the first pressure relief hole 23 is an inclined hole and points along the inner cavity 21 to the direction of the annular hole 15. The first pressure relief hole 23 is arranged obliquely downward to facilitate the fluid in the inner cavity 21 to flow into the annular hole 15 and to make the fluid have a smaller pressure drop. The second pressure relief hole 141 is opened in the valve seat 1 and connects the annular hole 15 and the second channel 12 . In some embodiments, the second pressure relief hole 141 is set at a corner of the mounting groove 13 and is an inclined hole.

[0046] Optionally, in this embodiment, the first pressure relief hole 23 and the second pressure relief hole 141 are located on both sides of the axis of the throttling member 2, so that the fluid flowing into the annular hole 15 from the first pressure relief hole 23 enters the second pressure relief hole 141 after being guided in the annular hole 15, and the axis of the first pressure relief hole 23 intersects with the axis of the second pressure relief hole 141.

[0047] In this embodiment, Figure 2 As shown, the diameter of the first pressure relief hole 23 is smaller than that of the second pressure relief hole 141 to achieve a throttling effect. The diameter of the second pressure relief hole 141 is smaller than the inner diameter of the second channel 12, and the inner diameter of the second channel 12 is less than or equal to the inner diameter of the inner cavity 21. As a result, the channel formed by the second channel 12 directly flowing into the inner cavity 21 through its other port is a large channel, while the channel formed by the second channel 12 through the second pressure relief hole 141, the annular hole 15, and the first pressure relief hole 23 is a small channel.

[0048] For further information, please see Figure 2 The pressure relief valve further includes a second sealing ring 6 installed in the annular hole 15. The second sealing ring 6 is used to seal the gap between the throttling member 2 and the side wall of the mounting groove 13 to ensure the sealing of the pressure relief valve.

[0049] Alternatively, see Figure 3The first channel 11 includes a first sub-channel 111 and a second sub-channel 112 that are vertically connected. One port of the first sub-channel 111 is located on the surface of the valve seat 1, and the second sub-channel 112 is connected to the first valve channel 41. The second channel 12 includes a third sub-channel 121 and a fourth sub-channel 122 that are vertically connected. One port of the third sub-channel 121 is located on the surface of the valve seat 1, and one port of the fourth sub-channel 122 is located on the wall of the mounting groove 13 and can communicate with the inner cavity 21. The axis of the first sub-channel 111 is collinear with the axis of the third sub-channel 121.

[0050] Optionally, the pressure relief valve in this embodiment may be a sterile pressure relief valve so as to be applicable in a sterile manufacturing process.

[0051] This embodiment also provides a filling device, such as Figure 4 As shown, the filling equipment includes a filling machine (not shown) and the above-mentioned pressure relief valve. The filling machine includes a filling pipeline 10 and a filling head 20 connected to the filling pipeline 10. The pressure relief valve is connected in series to the filling pipeline 10, and a first channel 11 and a second channel 12 are respectively connected to the filling pipeline 10. The fluid or cleaning liquid in the filling pipeline 10 can flow into the pressure relief valve through one of the first channel 11 and the second channel 12 and flow out of the pressure relief valve through the other.

[0052] The working principle of the pressure relief valve provided in this embodiment is as follows: During the filling process of carbonated beverages, when the bottle 100 is filled to the set capacity and pressure relief is required, the diaphragm valve 4 opens, and the valve core 3 clings to the first sealing ring 5 under the action of gravity and gas pressure, so that the lower end of the inner cavity 21 is disconnected from the second channel 12. The gas in the bottle 100 can only flow through the first channel 11, the first valve channel 41, the second valve channel 42, the inner cavity 21, the first pressure relief hole 23, the annular hole 15 and the second pressure relief hole 141 of the valve seat 1, and is discharged from the second channel 12 of the valve seat 1, thereby relieving the pressure in the bottle 100. When the filling pipeline 10 connected to the pressure relief valve is cleaned, the diaphragm valve 2 remains open, and the cleaning fluid enters from the second channel 12 of the valve seat 1. The lower part of the valve core 3 is subjected to the pressure of the cleaning fluid, such as Figure 4 As shown, it is pushed open and moves upward until it is blocked by the block 22 in the inner cavity 21 and stops. At this time, the larger channel formed between the inner cavity 21 and the second channel 12 is opened, and the cleaning liquid flows into the inner cavity 21 from the other port of the second channel 12, and also flows from the second pressure relief hole 141, through the annular hole 15 and the first pressure relief hole 23, into the inner cavity 21. The cleaning liquid then comes out of the inner cavity 21, flows through the second valve channel 42 and the first valve channel 41, and flows out from the first channel 11. During this cleaning process, since the larger channel can be opened, the flow rate of the cleaning liquid is basically not affected by the smaller first pressure relief hole 23, and can meet the flow rate required for cleaning, and the filling pipeline 10 is easily cleaned.

[0053] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. Pressure relief valve, characterized in that, include: A valve seat (1), the valve seat (1) having a first channel (11), a second channel (12) and a mounting groove (13), wherein two ports of the first channel (11) are respectively located on the surface of the valve seat (1), one port of the second channel (12) is located on the surface of the valve seat (1), and the other port of the second channel (12) is located on the groove wall of the mounting groove (13); A throttle member (2) is installed in the installation groove (13), and the throttle member (2) has an inner cavity (21), the inner cavity (21) is arranged opposite to the other port of the second channel (12) and can be directly connected to the second channel (12), and the pressure relief valve further includes a pressure relief channel (14) connecting the second channel (12) and the inner cavity (21); a valve core (3) movably mounted in the inner cavity (21), and capable of adjusting the communication area between the second channel (12) and the inner cavity (21) through the valve core (3); a diaphragm valve (4) mounted on the valve seat (1), wherein the diaphragm valve (4) has a first valve channel (41) and a second valve channel (42) in communication with each other, wherein the first valve channel (41) is in communication with the first channel (11), and the second valve channel (42) is in communication with the inner cavity (21); The throttling member (2) has a stopper (22), the stopper (22) is fixed in the inner cavity (21) and is arranged close to the second valve channel (42), and the stopper (22) is used to limit the valve core (3); The inner cavity (21) includes a first section (211), a second section (212), and a third section (213) with gradually increasing inner diameters, the first section (211) is connected to the second valve channel (42), and the inner diameter of the first section (211) is greater than or equal to the inner diameter of the second valve channel (42), the stopper (22) is arranged in the second section (212), the valve core (3) is located in the third section (213), and the third section (213) is connected to the second channel (12).

2. The pressure relief valve according to claim 1, characterized in that The valve core (3) further comprises a first sealing ring (5), which is installed between the throttling member (2) and the bottom wall of the installation groove (13). The valve core (3) can be pressed against the first sealing ring (5) to make the communication area between the second channel (12) and the inner cavity (21) zero.

3. The pressure relief valve according to claim 2, characterized in that: The valve core (3) is a sphere, and the valve core (3) is pressed against the first sealing ring (5) by its own weight.

4. The pressure relief valve according to claim 1, characterized in that The pressure relief channel (14) includes a first pressure relief hole (23), an annular hole (15) and a second pressure relief hole (141); the outer wall of the throttling member (2) is provided with a groove, and the groove wall of the groove and the groove wall of the mounting groove (13) form the annular hole (15); the first pressure relief hole (23) is opened in the throttling member (2) and the first pressure relief hole is connected to the annular hole (15) and the inner cavity (21); the second pressure relief hole (141) is opened in the valve seat (1), and the second pressure relief hole (141) is connected to the annular hole (15) and the second channel (12).

5. The pressure relief valve according to claim 4, characterized in that: The aperture of the first pressure relief hole (23) is smaller than the aperture of the second pressure relief hole (141), the aperture of the second pressure relief hole (141) is smaller than the inner diameter of the second channel (12), and the inner diameter of the second channel (12) is smaller than or equal to the inner diameter of the inner cavity (21).

6. The pressure relief valve according to claim 4, characterized in that It also includes a second sealing ring (6) installed in the annular hole (15), and the second sealing ring (6) is used to seal the gap between the throttling member (2) and the groove side wall of the installation groove (13).

7. The pressure relief valve according to claim 1, characterized in that The first channel (11) includes a first sub-channel (111) and a second sub-channel (112) that are vertically connected, a port of the first sub-channel (111) is located on the surface of the valve seat (1), and the second sub-channel (112) is connected to the first valve channel (41), and the second channel (12) includes a third sub-channel (121) and a fourth sub-channel (122) that are vertically connected, a port of the third sub-channel (121) is located on the surface of the valve seat (1), and a port of the fourth sub-channel (122) is located on the groove wall of the mounting groove (13) and can be connected to the inner cavity (21), and the axis of the first sub-channel (111) is collinear with the axis of the third sub-channel (121).

8. Filling equipment, characterized in that, The invention comprises a filling machine and a pressure relief valve according to any one of claims 1 to 7, wherein the filling machine comprises a filling pipeline (10), the pressure relief valve is connected in series to the filling pipeline (10), and the first channel (11) and the second channel (12) are respectively connected to the filling pipeline (10).

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