CN115978242A - Pressure relief valve and filling equipment - Google Patents

Abstract

The invention discloses a pressure relief valve and filling equipment, and belongs to the technical field of filling, wherein the pressure relief valve comprises a valve seat, a throttling element, a valve core and a diaphragm valve, wherein the valve seat is provided with a first channel, a second channel and a mounting groove, two ports of the first channel are respectively positioned on the surface of the valve seat, and the other port of the second channel is positioned on the wall of the mounting groove; the throttling element is arranged in the mounting groove and is provided with an inner cavity, the inner cavity can be directly communicated with the second channel, and the pressure relief valve further comprises a pressure relief channel communicated with the second channel and the inner cavity; the valve core is movably arranged in the inner cavity, and the communication area of the second channel and the inner cavity can be adjusted through the valve core; a diaphragm valve is mounted on the valve seat and has a first valve passage in communication with the first passage and a second valve passage in communication with the internal chamber. The pressure relief valve and the filling equipment provided by the invention have small influence on the flow speed of the cleaning liquid before and after flowing through the pressure relief valve, the cleaning degree of a pipeline connected with the pressure relief valve is improved, and a sanitary blind area is prevented.

Description

Pressure relief valve and filling equipment

Technical Field

The invention relates to the technical field of filling, in particular to a pressure relief valve and filling equipment.

Background

In the filling industry, when filling gas-containing beverages, a bottle is generally filled with low-pressure gas first and then filled, and the filling machine is generally provided with a pressure relief valve, so that when the bottle is filled to a set volume, the pressure in the bottle needs to be relieved by opening the pressure relief valve.

In the prior art, a pressure relief valve generally comprises a base, a stop valve, a throttle plate and other parts. The throttle sheet is arranged at the outlet of the stop valve, and a small hole with the diameter of about 1mm is formed in the throttle sheet and used for controlling the exhaust speed during pressure relief so as to prevent excessive foam from being generated during pressure relief of beverage in the bottle.

However, when cleaning the pipeline connected with the pressure relief valve, because the throttle plate is arranged in the pressure relief valve, the small holes in the throttle plate can seriously affect the flowing speed of the cleaning liquid in the front pipeline and the rear pipeline of the throttle plate, so that the pipeline connected with the pressure relief valve is difficult to clean, and a sanitary blind area exists.

Disclosure of Invention

The invention aims to provide a pressure relief valve and filling equipment, which have small influence on the flow speed of cleaning liquid before and after flowing through the pressure relief valve, improve the cleaning degree of a pipeline connected with the pressure relief valve and prevent sanitary blind areas.

As the conception, the technical scheme adopted by the invention is as follows:

a pressure relief valve comprising:

the valve seat is provided with a first channel, a second channel and a mounting groove, two ports of the first channel are respectively positioned on the surface of the valve seat, one port of the second channel is positioned on the surface of the valve seat, and the other port of the second channel is positioned on the groove wall of the mounting groove;

the throttling element is arranged in the mounting groove, is provided with an inner cavity, is arranged opposite to the other port of the second channel and can be directly communicated with the second channel, and the pressure relief valve further comprises a pressure relief channel communicated with the second channel and the inner cavity;

the valve core is movably arranged in the inner cavity, and the communication area of the second channel and the inner cavity can be adjusted through the valve core;

a diaphragm valve mounted on the valve seat and having a first valve passage and a second valve passage in communication, the first valve passage in communication with the first passage and the second valve passage in communication with the internal cavity.

Optionally, the throttling element has a stop block, the stop block is fixedly arranged in the inner cavity and is arranged close to the second valve passage, and the stop block is used for limiting the valve core.

Optionally, the inner cavity includes a first section, a second section, and a third section, where the inner diameter of the first section is gradually increased, the first section is communicated with the second valve passage, and the inner diameter of the first section is greater than or equal to the inner diameter of the second valve passage, the stopper is disposed at the second section, the valve core is located at the third section, and the third section is communicated with the second passage.

Optionally, the valve further comprises a first sealing ring, the first sealing ring is installed between the throttling element and the bottom wall of the installation groove, and the valve core can be abutted against the first sealing ring, so that the communication area between the second channel and the inner cavity is zero.

Optionally, the valve core is a ball, and the valve core abuts against the first sealing ring through self gravity.

Optionally, the pressure relief passage includes a first pressure relief hole, an annular hole and a second pressure relief hole, a groove is formed in an outer side wall of the throttle member, a groove wall of the groove and a groove wall of the mounting groove form the annular hole, the first pressure relief hole is opened in the throttle member, the first pressure relief hole communicates with the annular hole and the inner cavity, the second pressure relief hole is opened in the valve seat, and the second pressure relief hole communicates with the annular hole and the second passage.

Optionally, the first pressure relief vent has a smaller bore diameter than the second pressure relief vent, the second pressure relief vent has a smaller bore diameter than the inner diameter of the second passage, and the inner diameter of the second passage is less than or equal to the inner diameter of the inner cavity.

Optionally, the sealing device further comprises a second sealing ring installed in the annular hole, and the second sealing ring is used for sealing a gap between the throttling element and the side wall of the installation groove.

Optionally, the first channel includes a first sub-channel and a second sub-channel which are vertically communicated, one port of the first sub-channel is located on the surface of the valve seat, the second sub-channel is communicated with the first valve channel, the second channel includes a third sub-channel and a fourth sub-channel which are vertically communicated, one port of the third sub-channel is located on the surface of the valve seat, one port of the fourth sub-channel is located on the wall of the mounting groove and can be communicated with the inner cavity, and the axis of the first sub-channel is collinear with the axis of the third sub-channel.

The filling equipment comprises a filling machine and the pressure relief valve, wherein the filling machine comprises a filling pipeline, the pressure relief valve is connected in series on the filling pipeline, and the first channel and the second channel are respectively communicated with the filling pipeline.

The invention has the beneficial effects that:

according to the pressure relief valve and the filling equipment provided by the invention, the throttling element is provided with the inner cavity, the valve core is arranged in the inner cavity, and the valve core blocks the other port of the second channel when the filling pipeline does not need to be cleaned, so that the fluid in the inner cavity cannot directly flow into the second channel through the other port of the second channel but flows into the second channel through the pressure relief channel.

Drawings

FIG. 1 is a schematic cross-sectional view of a pressure relief valve provided in accordance with an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the invention at A as shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of a valve seat provided by an embodiment of the present invention;

fig. 4 is a schematic diagram of the connection of the pressure relief valve, the filling line, the filling head and the bottle according to the embodiment of the present invention.

In the figure:

1. a valve seat; 11. a first channel; 111. a first sub-channel; 112. a second sub-channel; 12. a second channel; 121. a third sub-channel; 122. a fourth sub-channel; 13. mounting grooves; 14. a pressure relief channel; 141. a second pressure relief vent; 15. an annular aperture; 2. a throttle member; 21. an inner cavity; 211. a first stage; 212. a second stage; 213. a third stage; 22. a stopper; 23. a first pressure relief vent; 3. a valve core; 4. a diaphragm valve; 41. a first valve passage; 42. a second valve passage; 5. a first seal ring; 6. a second seal ring; 10. filling a pipeline; 20. a filling head; 100. and (7) a bottle.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

This embodiment provides a pressure relief valve, and the flow velocity influence to the washing liquid around the flow pressure relief valve is less, has improved the abluent clean degree of pipeline that the pressure relief valve is connected, prevents the sanitary blind area of appearing.

As shown in fig. 1, the pressure relief valve includes a valve seat 1, a throttle 2, a valve core 3, and a diaphragm valve 4.

The valve seat 1 has a first passage 11, a second passage 12, and a mounting groove 13. Wherein the first channel 11 and the second channel 12 are independent from each other, and two ports of the first channel 11 are respectively located on the surface of the valve seat 1, and 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, that is, the second channel 12 can directly communicate with the mounting groove 13.

As shown in fig. 2 and 3, the orifice member 2 is fixedly installed in the installation groove 13. And, the orifice 2 has the cavity 21, the cavity 21 is set up opposite to another port of the second channel 12 and can communicate with the second channel 12 directly, namely, there is no other channel between cavity 21 and another port of the second channel 12, and, the relief valve also includes the pressure relief channel 14 communicating the second channel 12 and cavity 21, the pressure relief channel 14 is used for relieving the pressure in the bottle when the bottle is filled to the set capacity.

With continued reference to fig. 2, the valve core 3 is movably mounted in the inner cavity 21, and specifically, the valve core 3 moves up and down along the axial direction of the throttle 2. The communication area between the second passage 12 and the inner cavity 21 can be adjusted by the valve core 3, when the communication area between the second passage 12 and the inner cavity 21 is zero, the fluid in the inner cavity 21 cannot directly flow into the second passage 12, and the fluid in the second passage 12 cannot directly flow into the inner cavity 21.

The diaphragm valve 4 is fixedly mounted on the valve seat 1, and 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 passage 41 and a second valve passage 42 communicating with each other, the first valve passage 41 communicates with the first passage 11, and the second valve passage 42 communicates with the inner chamber 21.

When the pressure in the bottle needs to be relieved, the diaphragm valve 4 is in an open state, at this time, the fluid (gas-liquid, liquid or gas-liquid mixture) in the bottle 100 flows into the first channel 11 from the filling head 20 through the filling pipeline 10 and flows into the diaphragm valve 4 through the first channel 11 and the first valve channel 41, and the fluid in the diaphragm valve 4 flows into the inner cavity 21 through the second valve channel 42 and flows into the second channel 12 through the pressure relief channel 14, so that the pressure relief is realized. When the filling line 10 needs to be cleaned, cleaning liquid with a certain pressure enters the second passage 12, most of the cleaning liquid in the second passage 12 pushes the valve core 3 to move in the inner cavity 21 and directly flows into the inner cavity 21 through the other port of the second passage 12, a small part of the cleaning liquid in the second passage 12 flows into the inner cavity 21 through the pressure relief passage 14, the cleaning liquid in the inner cavity 21 flows into the second valve passage 42 and flows into the first passage 11 and the filling line 10 through the first valve passage 41, and the cleaning of the filling line and the pressure relief valve is achieved.

In the pressure relief valve provided by this embodiment, the throttling element 2 has the inner cavity 21, and the inner cavity 21 is provided with the valve core 3, when the valve core 3 does not need to clean the filling pipeline 10, the other port of the second passage 12 is blocked, so that the fluid in the inner cavity 21 cannot directly flow into the second passage 12 through the other port of the second passage 12, but flows into the second passage 12 through the pressure relief passage 14, when the filling pipeline 10 needs to be cleaned, the valve core 3 does not block the other port of the second passage 12, so that the cleaning fluid in the second passage 12 can directly flow into the inner cavity 21 through the other port of the second passage 12, so that the flow speed of the cleaning fluid is basically not affected by the pressure relief passage 14, the flow speed required for cleaning can be satisfied, the cleanliness degree for cleaning the filling pipeline 10 is improved, and a sanitary blind area is prevented from occurring.

Optionally, the throttling element 2 has a stop 22, the stop 22 is fixed in the inner cavity 21 and is arranged near the second valve passage 42, the stop 22 is used for limiting the valve core 3 to prevent the valve core 3 from moving out of the inner cavity 21, that is, the size of the space formed by the stop 22 is smaller than the cross-sectional size of the valve core 3. In some embodiments, the stopper 22 is provided in a plurality, and the plurality of stoppers 22 are arranged at intervals along the circumferential direction of the orifice 2, so as to reduce the influence on the flow area caused by the arrangement of the stoppers 22; in other embodiments, stop 22 is annular. The stopper 22 has a trapezoidal, square or other longitudinal cross section, which is not limited in this embodiment.

In this embodiment, with reference to fig. 2, the inner cavity 21 includes a first section 211, a second section 212, and a third section 213 with gradually increasing inner diameters and communicated with each other in sequence. The first section 211 is communicated with the second valve passage 42, and the inner diameter of the first section 211 is larger than or equal to the inner diameter of the second valve passage 42, so that the flow area is not greatly changed when the cleaning liquid in the inner cavity 21 flows into the second valve passage 42. The stopper 22 is disposed at the second section 212, the valve element 3 is disposed at the third section 213, and the third section 213 is communicated with the second passage 12. By providing the inner chamber 21 with a stepped shape, the volume of the inner chamber 21 can be made large on the basis of smooth abutment of the inner chamber 21 with the second valve passage 42.

Optionally, as shown in fig. 2, the pressure relief valve further comprises a first sealing ring 5. The first sealing ring 5 is installed between the throttling element 2 and the bottom wall of the mounting groove 13, in some embodiments, the first sealing ring 5 is located in the inner cavity 21 and contacts with the bottom wall of the mounting groove 13, and the first sealing ring 5 is used for sealing the gap between the throttling element 2 and the valve seat 1. The valve core 3 can abut against the first sealing ring 5 so that the communication area of the second channel 12 with the inner cavity 21 is zero, which is the case for pressure relief of the bottle 100. When the valve core 3 is far away from the first sealing ring 5, the communication area of the second channel 12 and the inner cavity 21 is not zero, and the condition is used for cleaning the filling pipeline 10.

In some embodiments, the valve core 3 is a ball, and the material may be stainless steel or other corrosion-resistant material. The valve element 3 abuts against the first sealing ring 5 by its own weight, so that the fluid in the inner cavity 21 does not directly flow into the second passage 12 through the other port of the second passage 12, but flows into the second passage 12 through the relief passage 14. Alternatively, the spool 3 is a solid sphere.

In this embodiment, with continued reference to fig. 2, the pressure relief passage 14 includes a first pressure relief hole 23, an annular hole 15 and a second pressure relief hole 141, which are sequentially connected. Wherein, the outer side wall of the throttling element 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. Specifically, the orifice 2 is composed of two cylindrical bodies having different diameters, the diameter of the upper cylindrical body is larger than that of the lower cylindrical body, and the end surfaces of the smaller and larger cylindrical bodies form the above-described groove. The larger diameter cylinder has a diameter equal to the inner diameter of the mounting groove 13 so that the two can be connected in a sealing manner. The first pressure relief hole 23 opens in the throttle 2 and communicates the annular hole 15 with the inner cavity 21. In some embodiments, the first pressure relief hole 23 is a slanted hole, and the first pressure relief hole 23 is arranged obliquely downward in the direction in which the inner cavity 21 points toward the annular hole 15, so that the fluid in the inner cavity 21 flows into the annular hole 15, and the fluid has a smaller pressure drop. The second pressure relief hole 141 opens in the valve seat 1, and the second pressure relief hole 141 communicates the annular hole 15 with the second passage 12, and in some embodiments, the second pressure relief hole 141 is disposed at a corner of the mounting groove 13, and the second pressure relief hole 141 is an oblique hole.

Alternatively, 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 throttle body 2, so that the fluid flowing into the annular hole 15 from the first pressure relief hole 23 flows into the second pressure relief hole 141 after flowing 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.

In this embodiment, as shown in fig. 2, the first pressure relief hole 23 has a smaller diameter than the second pressure relief hole 141, so as to achieve the throttling effect. The second pressure relief hole 141 has a smaller diameter than the inner diameter of the second passage 12, and the inner diameter of the second passage 12 is smaller than or equal to the inner diameter of the inner cavity 21, so that the passage formed by the second passage 12 directly flowing into the inner cavity 21 through the other port thereof is a large passage, and the passage formed by the second passage 12 through the second pressure relief hole 141, the annular hole 15, and the first pressure relief hole 23 is a small passage.

Further, with continued reference to fig. 2, the pressure relief valve further includes a second sealing ring 6 installed in the annular hole 15, and the second sealing ring 6 is used for sealing a gap between the throttling element 2 and the groove side wall of the installation groove 13, so as to ensure the sealing performance of the pressure relief valve.

Optionally, referring to fig. 3, the first channel 11 includes a first sub-channel 111 and a second sub-channel 112 vertically connected. Wherein one port of the first sub-passage 111 is located on the surface of the valve seat 1, and the second sub-passage 112 communicates with the first valve passage 41. The second passage 12 comprises a third sub-passage 121 and a fourth sub-passage 122 which are vertically communicated, one port of the third sub-passage 121 is positioned on the surface of the valve seat 1, one port of the fourth sub-passage 122 is positioned on the groove wall of the mounting groove 13 and can be communicated with the inner cavity 21, and the axis of the first sub-passage 111 is collinear with the axis of the third sub-passage 121.

Alternatively, the pressure relief valve in this embodiment may be an aseptic pressure relief valve to enable application in an aseptic manufacturing process.

The present embodiment also provides a filling apparatus, as shown in fig. 4, which includes a filling machine (not shown) and the pressure relief valve described above. The filling machine comprises a filling pipeline 10 and a filling head 20 communicated with the filling pipeline 10, the pressure relief valves are connected in series on the filling pipeline 10, the first channel 11 and the second channel 12 are respectively communicated with the filling pipeline 10, and fluid or cleaning fluid in the filling pipeline 10 can flow into the pressure relief valves from one of the first channel 11 and the second channel 12 and flow out of the pressure relief valves from the other.

The working principle of the pressure relief valve provided by the embodiment is as follows: in the process of filling the gas-containing beverage, when the bottle 100 is filled to a set volume and pressure is required to be relieved, the diaphragm valve 4 is opened, the valve core 3 is tightly attached 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 not communicated with the second channel 12, and 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, so that the pressure in the bottle 100 is relieved. When the filling pipeline 10 connected with the pressure relief valve is cleaned, the diaphragm valve 2 is kept in an open state, cleaning liquid 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 liquid, as shown in fig. 4, and is pushed open and moves upwards until the pressure is stopped after being blocked by the stop 22 in the inner cavity 21, at this time, a larger channel formed between the inner cavity 21 and the second channel 12 is opened, the cleaning liquid flows into the inner cavity 21 from the other port of the second channel 12, and simultaneously flows into the inner cavity 21 from the second pressure relief hole 141 after passing through the annular hole 15 and the first pressure relief hole 23, the cleaning liquid flows out from the inner cavity 21 again and flows out from the first channel 11 after flowing through the second valve channel 42 and the first valve channel 41, and in the cleaning process, because the larger channel can be opened, the flow speed of the cleaning liquid is basically not influenced by the smaller first pressure relief hole 23, the flow speed required by cleaning can be met, and the filling pipeline 10 can be cleaned easily.

The foregoing embodiments are merely illustrative of the principles and features of this invention, and the invention is not limited to the embodiments described above, but rather, is susceptible to various changes and modifications without departing from the spirit and scope of the invention, as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. Pressure relief valve, its characterized in that includes:

the valve seat (1) is provided with a first channel (11), a second channel (12) and a mounting groove (13), two ports of the first channel (11) are respectively positioned on the surface of the valve seat (1), one port of the second channel (12) is positioned on the surface of the valve seat (1), and the other port of the second channel (12) is positioned on the groove wall of the mounting groove (13);

the throttling element (2) is installed in the installation groove (13), the throttling element (2) is provided with an inner cavity (21), the inner cavity (21) is opposite to the other port of the second channel (12) and can be directly communicated with the second channel (12), and the pressure relief valve further comprises a pressure relief channel (14) which is communicated with the second channel (12) and the inner cavity (21);

the valve core (3) is movably arranged in the inner cavity (21), and the communication area of the second channel (12) and the inner cavity (21) can be adjusted through the valve core (3);

a diaphragm valve (4) mounted on the valve seat (1), the diaphragm valve (4) having a first valve passage (41) and a second valve passage (42) in communication, the first valve passage (41) being in communication with the first passage (11), the second valve passage (42) being in communication with the inner chamber (21).

2. Pressure relief valve according to claim 1, characterized in that the throttle element (2) has a stop (22), the stop (22) being fixedly arranged in the inner chamber (21) and being arranged close to the second valve passage (42), the stop (22) being adapted to limit the valve element (3).

3. The pressure relief valve according to claim 2, wherein the inner chamber (21) comprises a first section (211), a second section (212) and a third section (213) with gradually increasing inner diameters, the first section (211) is communicated with the second valve passage (42), the inner diameter of the first section (211) is larger than or equal to the inner diameter of the second valve passage (42), the stopper (22) is arranged at the second section (212), the spool (3) is arranged at the third section (213), and the third section (213) is communicated with the second passage (12).

4. The pressure relief valve according to any one of claims 1 to 3, further comprising a first sealing ring (5), wherein the first sealing ring (5) is installed between the throttling element (2) and the bottom wall of the installation groove (13), and the valve core (3) can be tightly pressed against the first sealing ring (5) so as to make the communication area between the second channel (12) and the inner cavity (21) zero.

5. The pressure relief valve according to claim 4, wherein the valve element (3) is a sphere, and the valve element (3) abuts against the first sealing ring (5) by its own weight.

6. A pressure relief valve according to any of claims 1-3, characterized in that the pressure relief channel (14) comprises a first pressure relief hole (23), an annular hole (15) and a second pressure relief hole (141), the outer side wall of the throttle element (2) is provided with a groove, and the groove wall of the groove and the groove wall of the mounting groove (13) constitute the annular hole (15), the first pressure relief hole (23) opens in the throttle element (2) and communicates the annular hole (15) with the inner cavity (21), the second pressure relief hole (141) opens in the valve seat (1), and the second pressure relief hole (141) communicates the annular hole (15) with the second channel (12).

7. The pressure relief valve according to claim 6, wherein the first relief holes (23) have a smaller pore size than the second relief holes (141), the second relief holes (141) have a smaller pore size than the inner diameter of the second passage (12), and the inner diameter of the second passage (12) is smaller than or equal to the inner diameter of the inner cavity (21).

8. A pressure relief valve according to claim 6, further comprising a second sealing ring (6) mounted in the annular bore (15), the second sealing ring (6) being adapted to seal a gap between the throttling element (2) and a groove side wall of the mounting groove (13).

9. The pressure relief valve according to claim 1, wherein the first passage (11) comprises a first sub-passage (111) and a second sub-passage (112) which are vertically communicated, one port of the first sub-passage (111) is located on the surface of the valve seat (1), the second sub-passage (112) is communicated with the first valve passage (41), the second passage (12) comprises a third sub-passage (121) and a fourth sub-passage (122) which are vertically communicated, one port of the third sub-passage (121) is located on the surface of the valve seat (1), one port of the fourth sub-passage (122) is located on the groove wall of the installation groove (13) and can be communicated with the inner cavity (21), and the axis of the first sub-passage (111) is collinear with the axis of the third sub-passage (121).

10. Filling plant, characterized in that it comprises a filling machine and a pressure relief valve according to any one of claims 1 to 9, said filling machine comprising a filling line (10), said pressure relief valve being connected in series to said filling line (10), and said first channel (11) and said second channel (12) being respectively in communication with said filling line (10).

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