Filter system, closure element and filter element

Abstract

The invention relates to a filter system (200) having a housing (210) in which an exchangeable filter element (100) is arranged between a filter front side (202) and a filter rear side (204), said filter element (100) comprising an element-fixing central tube (150), and in which a closing element (10) is arranged on the housing side, said closing element (10) opening a filter rear side fluid outlet (250) when the filter element (100) has been inserted, and closing the filter rear side fluid outlet (250) when the filter element (100) has been inserted. The closing element (10) blocks the filtered-rear-side fluid outlet (250) when the filter element (100) has been removed, and wherein the filter element (100) has an actuating element (160) for the closing element (10). The invention also relates to a closure element (10) for said filter system (100).

Description

Technical Field

[0001] The present invention relates to a filter element for filtering fluids (specifically fuel or oil); a filter system including a filter element (specifically a fuel filter or oil filter for a vehicle); and a shut-off element for said filter system. Background Technology

[0002] When a liquid filter (such as a fuel filter for diesel fuel) is in operation, it is essential to prevent unpurified liquid from being delivered to the internal combustion engine once the filter element has been removed.

[0003] EP1937962B1 therefore proposes to provide a sliding valve in the upper region of the filter housing, having a through opening that is positioned to align with a through opening on the housing's fixed central tube when the filter element has been inserted.

[0004] However, filtration systems without a housing-fixed central tube are also known, in which a filter element comprising an element-side central tube is used instead. Such a filtration system is described, for example, in WO2014 / 191486A1. Summary of the Invention

[0005] The present invention thus addresses the problem of constructing a filtration system, thereby enabling easy and reliable prevention of contamination on the back side of the filter when the filter element is removed, even with a central tube for element fixation.

[0006] The present invention also addresses the problem of producing shut-off elements for filter systems that include a central tube for fixing elements.

[0007] The above-mentioned problem is solved according to one aspect of the invention by means of a filtration system including a housing in which a replaceable filter element is arranged between a front side and a rear side of the filter element, the filter element including an element fixing central tube and having a closing element on the housing side, the closing element closing the rear side of the filter element when the filter element is removed.

[0008] According to another aspect of the invention, this problem is solved by a shut-off element that can be actuated by an element-fixing actuation element that can replace the filter element.

[0009] The advantageous features and benefits of the present invention become apparent from the appended claims, description and drawings.

[0010] A filtration system with a housing is proposed, in which a replaceable filter element is arranged between a pre-filter side and a post-filter side. The filter element includes an element fixing center tube, wherein a shut-off element is disposed on the housing side. When the filter element has been inserted, the shut-off element opens the post-filter fluid outlet, and when the filter element has been removed, the shut-off element blocks the post-filter fluid outlet. The filter element has an actuating element for the shut-off element.

[0011] The filtration system can be specifically configured to filter fuel in vehicles with internal combustion engines. The filter element can be specifically equipped with an element-fixed vent. When the filter element is removed, the shut-off element reliably separates the rear side of the filter from the front side. This makes it possible to prevent unpurified fuel from reaching the rear side of the filter during maintenance. The shut-off element allows for the use of installation space within the filter element for efficient separation of water from the filtered fuel. The shut-off element reduces pressure loss because a housing-fixed central tube or labyrinth deflector is not required in the fluid flow path. The filter pan can be cleaned or flushed during maintenance. The shut-off element is a less heavy and smaller component compared to a housing-fixed central tube.

[0012] The shut-off element requires a valve located in the bottom portion of the housing. This results in an arrangement within the filter element that is particularly advantageous for pressure loss and flow performance.

[0013] According to a preferred embodiment, the shut-off element can be arranged on a housing-side fastening stub using fastening devices, wherein a region of the shut-off element abuts against its outer or inner wall. This results in a very compact arrangement that is advantageous for the tool. In one embodiment, the fastening device of the shut-off element can abut against the fastening stub on the inner side. Subsequently, the outer wall of the fastening stub can be advantageously used for sealing and as a sliding surface for a sliding sleeve for the shut-off element. Purified fluid can be directed into the region of the shut-off element's internal space.

[0014] Alternatively, the fastening device of the shut-off element can be abutted against the fastening post on the outside. The outside of the fastening device can then be advantageously used to seal and serve as a sliding surface for the sliding sleeve of the shut-off element. This allows purified fluid to be guided into the internal space of the shut-off element.

[0015] According to a preferred embodiment, the actuating element may include one or more axial support ribs of the filter element, said axial support ribs being arranged on the rear side of the filter and pressing axially against a movable sliding sleeve of the closing element. Advantageously, the actuating element can cause the sliding sleeve to move against the spring force and open the flow to the rear side of the filter. If the filter element is removed, and thus the actuating element is removed, the spring force causes the sliding sleeve to move toward the valve seat, thereby blocking the flow to the rear side of the filter. This protects the rear side of the filter from foreign matter and contamination.

[0016] According to the invention, the shut-off element has an axial opening for receiving the element-fixing vent. Combining the housing-fixing shut-off element with the element-fixing vent in the bottom region of the housing generally achieves both lower pressure loss and a larger settling clearance, as well as improved water separation from the filtered fuel, because in the filtration system, there is no upward-directed flow that could impede the settling of water droplets. The opening is constructed for a leak-proof connection to the vent. When the filter element is inserted into the filtration system, the vent can be inserted into the opening, thus enabling the filter element to be guided axially. A seal can be arranged between the vent and the opening, for example, in the form of an O-ring around the lower end of the vent, wherein the wall of the opening serves as a sealing surface. Reversed arrangements are also conceivable, as are other necessary sealing methods.

[0017] According to a preferred embodiment, the filter element may be provided with a water separation device arranged on the rear side of the filter and including a final separator and / or coalescer, which are concentrically arranged around the ventilation duct. Within the filter element, the closing element creates space for effective water separation. For example, fuel may contain a certain amount of water, which can damage the injection system of an internal combustion engine. To avoid this, the contained water can be placed on the rear side of the filter system and rotated, for example via a rotating device, and thus separated and discharged separately due to the different specific gravities of water and fuel. Alternatively, a coalescer is used to coalesce small water droplets into larger droplets, which can then be collected and flow out at the final separator due to gravity. In water separation, the coalescer, the shape of the water droplet settling space, and the final separator can advantageously work together as a water separation device.

[0018] According to another aspect of the invention, a shut-off element for a filtration system is provided, wherein a replaceable filter element can be arranged between a pre-filter side and a post-filter side, the replaceable filter element comprising a valve body having a support for a sliding sleeve slidable along the valve body axially, wherein the sliding sleeve has a contact surface for an external actuating element and can be removed from the support by the application of the actuating element. The shut-off element also includes an axially continuous opening for fixing a vent duct to the element.

[0019] According to a preferred embodiment, the sliding sleeve may include an internal region coaxial with the valve body and having one or more through openings, and a skirt-shaped region coaxial with the internal region and the valve body. A sealing surface is disposed in the internal region, and in the closed state, the sealing surface is configured to abut against the valve seat. In the open state, the space between the internal and external sleeve regions serves as a through flow region.

[0020] According to a preferred embodiment, the contact surface may be arranged radially outward from the sealing surface. This allows for reliable and trouble-free contact of the actuating element in the installed state.

[0021] According to a preferred embodiment, in the installed state, the outer skirt-shaped region can be configured as a sealing surface on its inner side. This inner surface can specifically form a contact surface abutting against the fastening post for receiving a closing element. Alternatively, the inner surface can specifically form a contact surface abutting against a fastening element, by which the closing element is fastened to the fastening post.

[0022] According to a preferred embodiment, a spring receiving area specifically including a compression spring for moving the sliding sleeve can be constructed downstream of the support. Advantageously, the compression spring can be arranged there. The compression spring can be formed of metal or alternatively of plastic, preferably of glass fiber reinforced plastic. The spring force can be selected so that even without mechanical actuation of the sliding sleeve via the actuating element, fuel flow through the filtration system and, for example, fuel reaching the high-pressure pump is possible, but the flow resistance through the now hydraulically opened closing element indicates a high pressure loss to the end user, and thus generates a maintenance signal. Alternatively, the spring force can be selected so that, without mechanical actuation of the actuating element, the pressure in the low-pressure circuit is insufficient to open the closing element, and therefore, it is impossible to operate the internal combustion engine without the inserted filter element.

[0023] According to a preferred embodiment, a fastening element having a fastening device for securing to the mounting position can be disposed at the sliding sleeve side end of the valve body. Advantageously, this can be, for example, a locking hook capable of securely hooking onto a housing-side opposing element in the form of a fastening peg.

[0024] According to a preferred embodiment, the spring receiving area can be arranged coaxially with the fastening device. This allows for a compact construction of the closing element.

[0025] According to a preferred embodiment, a central opening in the axial direction can be provided at the end of the valve body opposite to the sliding sleeve side end of the valve body. This opening can be advantageously used to receive a vent pipe for the filter element.

[0026] According to another aspect of the invention, a replaceable filter element with an element-fixing central tube is provided for a filtration system. The filtration system includes a housing, wherein the replaceable filter element is arranged between a pre-filter side and a post-filter side, and includes an element-fixing actuating element for a housing-side closing element that opens a post-filter fluid outlet when the filter element is inserted and blocks the post-filter fluid outlet when the filter element is removed. The element also includes a water separation device arranged on the post-filter side and including a final separator and / or coalescer arranged concentrically around a vent duct. The actuating element has axial support ribs arranged on the post-filter side and radially supporting the final separator against the vent duct. Attached Figure Description

[0027] Further advantages arise from the following description of the accompanying drawings. The drawings illustrate embodiments of the invention. The drawings, description, and claims together encompass numerous features. Those skilled in the art will also suitably consider these features individually and combine them into reasonable additional combinations.

[0028] By example: Figure 1 A longitudinal cross-section of a filtration system for fuel filtration in a vehicle, having a housing-side shut-off element according to an embodiment of the invention, is shown. Figure 2 It shows Figure 1 A detailed view of the lower portion of the longitudinal cross-section, showing the arrangement details of the shut-off elements in the filtration system; Figure 3 Showing from Figure 1 A detailed view of a closed element in its open state; Figure 4 Showing from Figure 1 Detailed view of the closed element in the closed state; Figure 5 A filtration system having a housing-side shut-off element according to a second embodiment is shown; and Figure 6 Showing from Figure 5 The close element in the open state is shown in detail.

[0029] Figure 7 Showing from Figure 5 A detailed view of the closed element in its closed state. Detailed Implementation

[0030] In the accompanying drawings, identical or similar parts are numbered using the same reference numerals. The drawings are for illustrative purposes only and are not intended to be limiting.

[0031] The present invention is described in the context of a fuel filter, which can also be configured for other filtration systems by corresponding adjustments to its construction.

[0032] Figure 1 A longitudinal cross-section of a filtration system 200 for fuel filtration in a vehicle according to an embodiment of the present invention is shown. Figure 2 It shows Figure 1 A detailed view of the lower portion of the longitudinal cross-section, showing the arrangement details of the closing element 10 in the filter system 200.

[0033] The filtration system 200 includes a housing 210 having a lower housing portion 212 including a bottom 214 and an upper housing portion 218 in the form of a screw-on cap, and a filter element 100 disposed in the housing 210 and separating a front filter side 202 from a rear filter side 204. The filter element 100 can receive flow through it in an axial direction (e.g., from the outside to the inside).

[0034] The filter element is, for example, a cylindrical body having a closed upper end plate 112 and an open lower end plate 114. The filter bellows 110 may be, for example, star-shaped folds. The filter bellows 110 is arranged on the element fixed central tube 116 and surrounds the final separator 130, which serves as a water separation device 120, thereby separating water from the fuel at the post-filtration side 204. Optionally, a coalescer may be provided between the central tube 116 and the final separator 130 to improve water separation. Water is collected at the post-filtration side via water passage 238 and enters a collection space 240 below the filter element 100. The purified fuel is guided through the open end plate 114 to the fluid outlet 250. The central passage 248 is configured as a return section to a container (not shown).

[0035] The filter element 100 also includes an element-fixed vent 150 coaxially surrounded by the filter bellows 110 and the final separator 130. The vent 150 has a ventilation opening 170 at its upper end on the closed end plate 112, and a sealing ring 154 is inserted into and closed at its lower end in the axial opening 60 of the closing element 10. When the filter system 200 is in operation, air is present in the vent 150, and during operation, the vent 150 is filled with fuel from the filter front side 202.

[0036] The filter element 100 is connected to the quick connector, for example, by snap-fit ​​to the upper portion 218 of the housing, and can therefore be pulled out from the lower portion 212 of the housing without the upper portion 218 being screwed on, for example, when the filter element 100 is replaced for maintenance purposes.

[0037] For example, WO2014 / 191486A1 describes certain filter elements and filter systems including a centrally mounted element tube and a centrally mounted ventilation duct as a central support tube.

[0038] According to the present invention, the filtration system 200 has a shut-off element 10 on the housing side, which opens the downstream fluid outlet 250 when the filter element 100 has been inserted and blocks the downstream fluid outlet 250 when the filter element 100 has been removed. For this purpose, the filter element 100 has an actuating element 160 for the shut-off element 10.

[0039] The closing element 10 is disposed in the bottom portion 214 of the housing 210 and fixed therein in the fastening post 220, wherein the skirt-shaped region 42 of the sliding sleeve 40 of the closing element 10 abuts against the outer wall of the cylindrical portion 222 surrounding the fastening post 220. The outer wall forms a sliding and sealing surface for the skirt-shaped region 42 of the sliding sleeve 40. The closing element 10 is hooked onto the inner wall of the fastening post 220, for example, by a fastening device.

[0040] The actuating element 160 includes a plurality of axial support ribs 152 of the filter element 100, the plurality of axial support ribs being arranged on the rear side of the filter and pressing axially against the movable sliding sleeve 40 of the shut-off element 10. The support ribs 152 support the final separator 130 radially toward the vent 150.

[0041] The pressure of the support rib 152 on the sliding sleeve 40 at the bottom 214 opens the through flow to the fluid outlet 250 through the filtered fluid channel 50 in the form of multiple through openings in the inner region of the sliding sleeve 40 of the closing element 10.

[0042] The shut-off element 10 is in Figure 3 and 4 Detailed description is provided. Figure 3 and 4 The closing element 10 is shown in both the open and closed states.

[0043] The shut-off element 10 includes a generally cylindrical valve body 12 having a valve seat 30 that extends radially on its outer periphery for a sliding sleeve 40 that can be axially displaced along the valve body 12 and coaxially surrounds the valve body 12.

[0044] A spring receiving region 16 with a compression spring 20 is arranged on the free end of the sliding sleeve side of the valve body 12, wherein the compression spring 20 extends between a spring seat 18 at the free end of the valve body 12 and a spring seat of portion 46 in the inner region of the sliding sleeve 40. The compression spring 20 abuts against the flat portion of portion 46 at its lower end. Portion 46 is cylindrical on its inner periphery and is thus able to slide along the valve body 12 to close or open the closing element 10, and conically widens from the seat for the compression spring 20 on its outer side to a region 49 of the sliding sleeve 40, which transitions to a fluid-tight, coaxially surrounding skirt-shaped outer region 42 of portion 46. The outer region 42 extends to the free end of the valve body 12 and partially surrounds the spring receiving region 16. Region 49 has a contact surface 48 for the actuating element 160. Figure 1 and 2 The actuating element is oriented away from the free end of the valve body 12.

[0045] A circumferential sealing surface 38 is disposed between the inner portion 46 and the outer region 42 of the sliding sleeve 40, wherein the circumferential sealing surface is in the closed state of the closing element 10 ( Figure 4 The valve body 12 is supported by a sealing device 32 in the form of a circumferential sealing surface 34 of the valve seat 30. For example, the sealing surfaces 34 and 38 have complementary shapes and are configured to be inclined relative to the longitudinal axis of the valve body 12. The filtered fluid passage 50 in a portion 46 of the inner region of the sliding sleeve 40 is arranged axially inside the sealing surface 38.

[0046] For use in adjacent external actuation element 160 (e.g. from) Figure 1 and 2 The annular contact surface 48 of the support rib is constructed radially outside the sealing surface 38 between portion 46 and skirt-shaped region 42. When the filter element 100 is inserted ( Figure 1 and 2 The actuating element 160 presses the sliding sleeve 40 to the bottom of the housing, thereby opening the post-filter fluid passage 50. When the filter element 100 is removed ( Figure 1 and 2 The compression spring 20 presses the sliding sleeve 40 against the sealing device 32 with its sealing surface 38, thereby closing the filtered fluid channel 50.

[0047] In the installed state, on its inner side 44, the outer skirt-shaped region 42 serves as a cylindrical portion 222. Figure 1 and 2 The supporting and sealing surfaces of the surface.

[0048] A fastening element 24 is disposed at the free end of the sliding sleeve side of the valve body 12. This fastening element has a fastening device 14 in the form of a locking hook for securing to the mounting position. The locking hook, for example, is oriented inward and can securely hook onto the opposing element (fastening post 220) of the housing 210. Figure 1 and 2 An O-ring-shaped seal 22 seals the area between the fastening device 14 and the spring container 16, which coaxially surrounds the fastening device.

[0049] Figure 5 A longitudinal section is described for another embodiment of a filtration system 200 for fuel filtration in a vehicle having a housing-side closing element 10 according to an embodiment of the present invention.

[0050] The filtration system 200 includes a housing 210 having a lower housing portion 212 including a bottom 214 and an upper housing portion 218 in the form of a screw-on cap, and a filter element 100 disposed in the housing 210 and separating a front filter side 202 from a rear filter side 204. The filter element 100 can receive flow through it in an axial direction (e.g., from the outside to the inside, as indicated by the arrow from the outside to the inside).

[0051] The filter element 100 is, for example, a cylindrical body having end plates 112, 114 that are open on both sides. The upper end plate 112 is connected to the head portion of the vent 150 that is sealed against the rear side 204 of the filter in a manner that seals its internal periphery, and extends inside the filter element 100 to the shut-off element 10.

[0052] The filter bellows 110 of the filter element 100 can be, for example, star-shaped folds. The filter bellows 110 is arranged on the element's fixed central tube 116 and surrounds the final separator 130, which serves as a water separation device 120, thereby separating water from the fuel at the post-filtration side 204. A coalescer 132 for improving water separation is provided between the central tube 116 and the filter bellows 110. Water can be collected at the post-filtration side via water passage 238 and enters a collection space below the filter element 100. The purified fuel is guided through the open end plate 114 to the fluid outlet 250. The central channel 248 is configured as a fuel return section to a container (not shown).

[0053] Furthermore, the filter element 100 has an element-fixed vent 150 coaxially surrounded by a filter bellows 110 and a final separator 130. The vent 150 has a ventilation opening 170 on its upper end plate 112, and its lower end in the axial opening 60 of the closing element 10 is inserted and closed by a sealing ring 154. When the filtration system 200 is in operation, air is present in the vent 150, and during operation, the vent 150 is filled with fuel from the filter front side 202.

[0054] The filter element 100 can be connected to the upper portion 218 of the housing, for example, by a quick connector in the form of a snap-fit ​​connection, and can therefore be pulled out from the lower portion 212 of the housing without the upper portion 218 being screwed on, for example, when the filter element 100 is replaced for maintenance purposes.

[0055] For example, WO2014 / 191486A1 describes certain filter elements and filter systems including a centrally mounted element tube and a centrally mounted ventilation duct as a central support tube.

[0056] According to the present invention, the filtration system 200 has a shut-off element 10 on the housing side. When the filter element 100 has been inserted, the shut-off element 10 opens the rear-filter fluid outlet 250, and when the filter element 100 has been removed, the shut-off element 10 blocks the rear-filter fluid outlet 250. For this purpose, the filter element 100 has an actuating element 160 for the shut-off element 10. The actuating element 160 includes a plurality of axial support ribs 152 of the filter element 100, which are arranged on the rear-filter side and press against the movable sliding sleeve 40 of the shut-off element 10 in the axial direction. The support ribs 152 support the final separator 130 radially toward the vent 150.

[0057] A shut-off element 10 is disposed on a fastening post 220 in the bottom portion 214 of the housing 210, the fastening post 220 being open to the upper portion 218 of the housing. The shut-off element 10 overlaps the fastening post 220 and is fastened to the outer side of the fastening post 220, for example, by a snap hook. The lower end of the shut-off element 10 protrudes into a housing-side outlet 260 and is sealed therefrom from the filter-back side 204 by a seal 22, the housing-side outlet 260 being disposed in the bottom region of the fastening post 220. The outlet 260 connects a vent 150 to a channel 248 via the shut-off element 10 for fuel recirculation into a container (not shown). Purified fuel can flow around the lower end of the shut-off element 10 within the fastening post 220 to a fluid outlet 250. Filter-back water can flow outside the fastening post 220 to a collection space (not shown).

[0058] The sliding sleeve 40 is opened by the pressure of the support rib 152 at the bottom 214, allowing the through flow to pass through the through opening in the closing element 10 to the fluid outlet 250.

[0059] Figure 6 Showing from Figure 5 The close element 10 in the open state is shown in detail view. Figure 7 Showing from Figure 5 Detail view of the closed element 10 in the closed state.

[0060] The shut-off element 10 includes a generally cylindrical valve body 12 having an axially continuous opening 60 and a sealing device container 28 extending radially outward on its outer periphery. The sealing device container has a groove in which a sealing device 32 in the form of a sealing ring 36 is placed.

[0061] The closing element 10 has a fastening element 24, and the closing element 10 can be inserted into the housing 210 in a housing-fixed manner by means of the fastening element. Figure 5The fastening element 24 is stepped and has a fastening device 14, for example in the form of a hook, in the lower portion 23, and is constructed as a cylindrical portion in the adjacent upper portion 25.

[0062] For use with its seal 154 ( Figure 5 The axial continuous opening 60 at the lower end of the receiving ventilation pipe 150 is provided in the upper portion 218 of the valve body 12 facing the housing in the installed state. Figure 5 At the lower end of the valve body 12, a groove with a seal 22 is provided on the outer periphery, the seal being used to seal the valve body 12 in the bottom side outlet 260 of the housing 210.

[0063] In the region of the sealing device container 28, the opening 60 has a step, so that the inner diameter gradually decreases in the direction of the lower end. The outer diameter is also smaller than the aforementioned diameter below the sealing device container 28.

[0064] A sliding sleeve 40 is disposed below the sealing device container 28. The sliding sleeve is axially movable along the valve body 12 between an open position (with an inserted filter element) and a closed position (with a removed filter element). The sliding sleeve 40 is pressed into the closed position by a compression spring 20 arranged in the spring receiving area 16 of the closing element 10, and is pressed into the open position by a filter element-side actuating element on the contact surface 48 of the sliding sleeve 40.

[0065] Compression spring 20 extends between spring seat 18 located at the end of fastening element 24 facing support 30 and spring seat located in region 49 of sliding sleeve 40. A sealing surface 38 is arranged on the inner side of region 49, which is used when closing element 10 is closed. Figure 7 The sealing surface 38 abuts against a sealing device 32 in the form of a circumferential sealing ring 36. The sealing surface 38 is, for example, a slope at region 49. Region 49 has a contact surface 48 for the actuating element 160. Figure 5 The actuating element is oriented away from the free end of the valve body 12.

[0066] Leaving the contact surface 48, region 49 transitions outward into the skirt-shaped outer region 42 of the sliding sleeve 40. This skirt-shaped outer region is coaxially arranged with the valve body 12 and has a stepped upper portion 41 and a lower portion 43. The upper portion 41 has a smaller diameter than the lower portion 43. In the open state of the closing element 10, the sliding sleeve 40 abuts against the outer side 26 of the upper cylindrical portion 25 of the fastening element 24, with its lower portion 43 adjacent to its inner side 44. The outer side 26 of the upper cylindrical portion 25 forms a sliding and sealing surface for the skirt-shaped region 42 of the sliding sleeve 40.

Claims

1. A filtration system (200) for fluids, having a housing (210), wherein, A replaceable filter element (100) is arranged between the front side (202) and the rear side (204) of the filter. A rear-side fluid outlet (250) and a central channel (248) are provided in the bottom portion (214) of the housing (210). The central channel (248) serves as a return flow section to the container. The filter element (100) includes a filter bellows (110), an element-fixing central tube (116), and an element-fixing vent (150). The element-fixing vent (150) is coaxially surrounded by the central tube (116) and the filter bellows (110). The closing element (10) is disposed on the housing side. The closing element (10) is arranged at the housing side fastening post (220) by a fastening element (24) with a fastening device (14). When the filter element (100) has been inserted, the closing element (10) opens the fluid outlet (250) on the back side of the filter. When the filter element (100) has been removed, the closing element (10) blocks the fluid outlet (250) on the back side of the filter. The filter element (100) has an actuating element (160) for closing the element (10). The shut-off element (10) is a valve arranged in the bottom portion (214) of the housing (210), including a filtered fluid passage (50) and an axially continuous central opening (60) for the element fixing vent (150), the axially continuous central opening (60) being configured to connect to the vent (150) without leakage, so that the element fixing vent (150) can be connected to the channel (248) for fuel return via the shut-off element (10).

2. The filtration system according to claim 1, wherein, The fastening element (24) of the closing element (10) is adjacent to the fastening post (220) on the inside.

3. The filtration system according to claim 1, wherein, The fastening element (24) of the closing element (10) is adjacent to the fastening post (220) on the outside.

4. The filtration system according to any one of claims 1 to 3, wherein, The actuating element (160) includes one or more axial support ribs (152) of the filter element (100), which are arranged on the rear side of the filter and press against the movable sliding sleeve (40) of the closing element (10) in the axial direction.

5. The filtration system according to claim 4, wherein, The sliding sleeve (40) is arranged to be axially movable on the outer side of the fastening pile (220) by means of the inner side (44).

6. The filtration system according to claim 4 or 5, wherein, The sliding sleeve (40) is arranged to be axially movable on the outer side (26) of the fastening element (24) by means of the inner side (44).

7. The filtration system according to any one of the preceding claims, wherein, The filter element (100) is provided with a water separation device (120), which is arranged on the back side of the filter and includes a final separator (130) and / or a coalescer, which are arranged concentrically around the ventilation duct (150).

8. A shut-off element (10) for a filtration system (200) according to any one of claims 1 to 7.

9. The shut-off element (10) according to claim 8 further includes a valve body (12) having a support (30) for a sliding sleeve (40) axially displaceable along the valve body (12), wherein, The sliding sleeve (40) has a contact surface (48) for an external actuating element (160) and can be removed from the support (30) when actuated by the actuating element (160).

10. The shut-off element according to claim 9, wherein, The sliding sleeve (40) includes an inner region having one or more through openings (50) coaxial with the valve body (12) and a skirt-shaped region (42) coaxial with the inner region and the valve body (12), wherein a sealing surface (38) is arranged in the inner region and, in the closed state, the sealing surface (38) is configured to abut against the support (30).

11. The shut-off element according to claim 10, wherein, The contact surface (48) is arranged radially outside the sealing surface (38).

12. The shut-off element according to any one of claims 9 to 11, wherein, In the installed state, the skirt-shaped area (42) is provided on its inner side (44) as a sealing surface.

13. The shut-off element according to any one of claims 9 to 12, wherein, A spring receiving area (16) for a compression spring (22) for moving the sliding sleeve (40) is constructed downstream of the support (30).

14. The shut-off element according to any one of claims 9 to 13, wherein, The fastening element (24) is located at the end of the sliding sleeve side of the valve body (12).

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