Overpressure valve for a door drive

Abstract

The invention relates to a pressure relief valve 1 for a door drive, in particular for a door closer. The pressure relief valve 1 comprises a housing 3, a sealing element 5, a spring element 7, and a bearing element 9. The spring element 7 is clamped between the bearing element 9 and the sealing element 5 within the housing 3 such that it biases the sealing element 5 from its open position to its closed position. According to the invention, the bearing element 9 is fixed in the housing 3 by means of at least one plastic deformation 3b of the housing 3. By means of this plastic deformation 3b, the bearing element 9 is fixed in the housing 3 at precisely the relative position in which the sealing element 5 is biased into its closed position by the spring element 7 with a predetermined force. The present invention further relates to a door drive with such a pressure relief valve 1 and to a corresponding manufacturing method for such a pressure relief valve 1.

Description

[0001] The invention relates to a pressure relief valve for a door drive, in particular for a door closer, a door drive, in particular a door closer with such a pressure relief valve and a method for producing such a pressure relief valve.

[0002] Conventional pressure relief valves for door drives and in particular for door closers comprise, and in particular consist of, four main components: a housing, a sealing element, a spring element, and a bearing element. The housing contains a flow channel formed therein. The sealing element is movable in the housing between a closed position, in which it closes the flow channel, and an open position, in which it releases the flow channel. The bearing element, in particular like the sealing element and the spring element, is inserted in an axial direction into a receiving area of ​​the housing and fixed in the housing. The spring element is clamped within the housing between the bearing element and the sealing element in such a way that it preloads the sealing element from its open position to its closed position.

[0003] The resulting preload force for the sealing element defines the response pressure of the pressure relief valve and depends essentially on the specific position in which the bearing element is fixed within the housing.

[0004] According to a conventional approach, the bearing element is fixed within the housing using a retaining clip. An example of such a clip is shown in FIG. 3 shown.

[0005] The FIG. 3The pressure relief valve 1 shown according to the prior art is formed from a housing 3, a sealing element 5, a spring element 7, and a bearing element 9. In contrast to the embodiment according to the invention described below, here the housing 3 has a plurality of recesses 3c. The bearing element 9 has clip contours or formations 9c. To assemble this pressure relief valve 1, the bearing element 9 is pushed axially into a receiving area 3a of the housing 3 after the sealing element 5 and after the spring element 7 until the clip contours or formations 9c of the bearing element 9 engage in the recesses 3c of the housing 3. A relative position between the bearing element 9 and the housing 3 depends on the specific positioning of the recesses 3c in the housing 3 or the clip contours or formations 9c on the bearing element 9.Consequently, the force with which the sealing element 5 is preloaded into its closed position by the spring element 7 is already determined before the individual components 3, 5, 7, and 9 are assembled. This also applies to the response pressure of the final pressure relief valve 1. Compensation for possible manufacturing tolerances is no longer possible.

[0006] However, it has been shown that with such a design, even small tolerance fluctuations in the manufacture of the individual components 3, 5, 7 and 9 of the pressure relief valve 1 can lead to relatively large fluctuations in the response pressure obtained.

[0007] In light of this, it is an object of the present invention to provide a pressure relief valve for a door drive in which the predetermined response pressure is obtained simply and, above all, reliably.

[0008] This object is achieved by a pressure relief valve for a door drive having the features of claim 1. Advantageous developments for such a pressure relief valve can be found in the dependent claims. Furthermore, the present invention also relates to a door drive with such a pressure relief valve and a manufacturing method for obtaining such a pressure relief valve.

[0009] The pressure relief valve according to the invention is distinguished from the conventional pressure relief valves described above in that the bearing element is fixed in the housing by at least one plastic deformation of the housing. The plastic deformation positions and fixes the bearing element in the housing in such a way that the sealing element is preloaded into its closed position by the spring element with a predetermined force.

[0010] Accordingly, according to the invention, the bearing element is not fixed to the housing in a fixed, predetermined relative position. Rather, the bearing element is fixed at precisely the relative position that maintains the preload force of the sealing element necessary for the desired response pressure. This makes it possible to compensate for tolerances that occur during the manufacture of the individual components of the pressure relief valve by adjusting the selection of the specific relative positioning of the bearing element within the housing when assembling the pressure relief valve. This is achieved in a particularly simple manner, namely by adjusting the position of the respective plastic deformation of the housing along the receiving area of ​​the housing. Plastic deformation here means an actual deformation or reshaping of the housing.A mere recess or a certain predetermined shape of the housing, as is the case, for example, with the prior art design described above, does not fall under the term "deformation" as understood here.

[0011] Preferably, the bearing element has at least one recess in a radial outer circumference of the bearing element, and the at least one plastic deformation of the housing projects into the at least one recess to thereby establish an axial relative positioning of the bearing element with respect to the housing. In particular, the respective plastic deformation and the respective recess form a positive fit. This is a particularly simple and reliable way of securing the bearing element in the housing.

[0012] Preferably, the bearing element has at least two separate recesses of this type, while the housing has at least two separate corresponding plastic deformations. Each of the plastic deformations extends into one of the separate recesses. The formation of several pairs of recesses and corresponding deformations leads to a more reliable and firmer fixation of the bearing element in the housing.

[0013] Further preferably, the separate recesses in the bearing element and the corresponding separate plastic deformations of the housing are evenly distributed around the radial outer circumference of the bearing element. This prevents tilting of the bearing element within the housing, which in turn counteracts fluctuations in the response pressure of the pressure relief valve.

[0014] Further preferably, the separate recesses in the bearing element and the corresponding separate plastic deformations of the housing are each distributed in pairs opposite one another around the radial outer circumference of the bearing element. In other words, a pair of recesses and respective plastic deformations is opposite a corresponding pair of recesses and respective deformations. This facilitates the manufacture of corresponding pressure relief valves and reduces the risk of unwanted stresses in the housing during the formation of the respective deformations.

[0015] Preferably, the bearing element has a sleeve portion that at least partially surrounds the spring element transversely to the longitudinal direction of the spring element. This enables a particularly compact yet stable design of the pressure relief valve.

[0016] Further preferably, the respective recess(es) is / are formed by a respective opening in the sleeve portion of the bearing element. Such openings are easy to form and allow the respective deformations to be formed throughout the entire wall of the sleeve portion. This enables particularly precise and reliable fixation of the bearing element within the receiving area of ​​the housing.

[0017] Preferably, the bearing element is designed such that, before the at least one plastic deformation of the housing occurs, it is continuously displaceable in the axial direction of the housing's receiving area. In other words, the bearing element is designed such that its relative positioning within the housing can be continuously selected, i.e., across a continuous range of relative positions. This enables particularly precise adjustment of the resulting preload force and thus the response pressure of the pressure relief valve during its formation.

[0018] Preferably, apart from the plastic deformation(s) formed, no further fixation is provided between the bearing element and the housing. Thus, only the plastic deformation(s) formed serve to fix the bearing element within the housing. Such a design is particularly simple and cost-effective to achieve.

[0019] Alternatively, in addition to the plastic deformation(s) formed, at least one further fixation is preferably provided between the bearing element and the housing. This means that, particularly after the formation of the plastic deformations and thus after a pre-fixation of the bearing element within the housing, at least one further fixation of the bearing element to the housing is formed. This enables a particularly reliable fixation of the bearing element at the respective relative position within the housing.

[0020] Further preferably, at least one additional fixation is formed by welding the housing to the bearing element. In particular, this involves laser welding of the housing to the bearing element. Such additional fixations are comparatively easy to form and ensure particularly reliable fixation of the bearing element.

[0021] A further aspect of the present invention relates to a door drive, in particular a door closer, with at least one of the previously described pressure relief valves. Such a door drive allows the advantages provided by the respective pressure relief valve to be utilized.

[0022] Yet another aspect of the present invention relates to a method for producing a pressure relief valve for a door drive, in particular for producing a pressure relief valve for a door closer. In particular, the present invention relates to a method for producing one of the previously described pressure relief valves.Conventional manufacturing methods regularly comprise at least the following steps: providing a housing with a flow channel formed therein and a receiving region; introducing a sealing element and a spring element into the receiving region of the housing such that the sealing element is provided in the housing so as to be movable between a closed position in which it closes the flow channel and an open position in which it releases the flow channel; positioning a bearing element in the receiving region of the housing such that the spring element is clamped between the sealing element and the bearing element such that it preloads the sealing element from its open position to its closed position.The manufacturing method according to the invention is characterized in that the fixing of the bearing element within the housing is achieved by forming at least one plastic deformation of the housing at a position in which the sealing element is prestressed into its closed position by the spring element with a predetermined force.

[0023] As already explained above, according to the invention, the bearing element is not fixed at a relative position in the housing defined by previously formed recesses. Rather, the fixing is achieved by creating at least one corresponding deformation of the housing, specifically at the relative position in which the predetermined preload force for the sealing element corresponding to the desired response pressure is achieved. This enables the simple and reliable compensation of any tolerances in the manufacture of the individual components of the pressure relief valve during its assembly.

[0024] Preferably, during assembly of the pressure relief valve, the bearing element is pushed into the receiving area against the force of the spring element with a force corresponding to the predetermined preload force, and the bearing element is fixed in the thus obtained relative position relative to the housing by the formation of at least one plastic deformation. This method is particularly simple to implement and enables reliable fixation of the bearing element in the corresponding relative position.

[0025] Preferably, at least one recess is formed in a radial outer periphery of the bearing element prior to positioning the bearing element in the receiving area. The at least one plastic deformation of the housing is then formed such that it protrudes into the at least one recess, thus determining an axial relative positioning of the bearing element with respect to the housing. In particular, the plastic deformation and the respective recess form a positive connection. Such a procedure is particularly simple and accordingly cost-effective.

[0026] Further preferably, at least two separate such recesses are formed in the radial outer periphery of the bearing element, and at least two separate plastic deformations are formed in the housing such that each of the plastic deformations extends into one of the separate recesses. The formation of several pairs of recesses and plastic deformations enables a particularly reliable and precisely positioned fixation of the bearing element in the housing.

[0027] Further preferably, the separate recesses in the bearing element and the plastic deformations of the housing are formed evenly distributed around the radial outer circumference of the bearing element. This enables a particularly stable and reliable overall design for the pressure relief valve.

[0028] Further preferably, the separate recesses in the bearing element and the deformations of the housing are formed in pairs opposite one another and distributed around the radial outer circumference of the bearing element.

[0029] Preferably, the at least one plastic deformation of the housing is formed by means of a conical punch. Such formation of the at least one plastic deformation is particularly simple and enables particularly reliable fixation of the bearing element.

[0030] Preferably, in addition to the plastic deformation(s) formed, no further fixation is formed between the bearing element and the housing.

[0031] This simplifies the manufacturing process and saves costs.

[0032] Alternatively, in addition to the plastic deformation(s) formed, at least one further fixation is preferably formed between the bearing element and the housing. This provides a particularly reliable and durable fixation of the bearing element.

[0033] Further preferably, at least one further fixation is formed by welding, in particular by laser welding, the housing to the bearing element. Such a further fixation is relatively simple to form and yet reliable and durable.

[0034] The invention will now be described by way of example with reference to the accompanying drawings. FIG. 1 is an exploded view of an exemplary pressure relief valve according to the invention; FIG. 2A is a sectional view of the pressure relief valve from FIG. 1 during assembly of the pressure relief valve; and FIG. 2B shows a sectional view of the pressure relief valve from FIG. 1 during the formation of the deformations for fixing the bearing element in the housing.

[0035] Now, with reference to the Figures 1 , 2A and 2B an embodiment of a pressure relief valve 1 according to the invention is described.

[0036] The pressure relief valve 1 shown essentially consists of a housing 3, a sealing element 5, a spring element 7 and a bearing element 9. As shown in particular in the Figures 2A and 2B As can be seen, a flow channel 4 is formed in the housing 3. This runs from an inlet 4a to at least one outlet 4b. The sealing element 5 is inserted into a receiving area 3a of the housing 3 in such a way that it closes the flow channel 4 in a closed position (see FIG. 2A and FIG. 2B ).

[0037] In the embodiment shown, two opposing outlets 4b are formed for the flow channel 4. However, the specific design of the flow channel 4 and the sealing element 5 are not limited to this variant. For example, only one outlet 4b can be formed, which is then provided in particular at the end of the receiving area, as is the case with the embodiment shown in FIG. 3 shown design is the case.

[0038] All that is important is that the bearing element 9 is inserted axially into the receiving area 3a of the housing 3 and is or will be fixed in the housing 3, and that the spring element 7 is or will be clamped between the bearing element 9 and the sealing element 5 within the housing 3 in such a way that the spring element 7 preloads the sealing element 5 into its closed position. The sealing element 5 must be movable against the preload force of the spring element 7 from the closed position to an open position, in which the sealing element 5 releases the flow channel 4.

[0039] This movement into the open position is caused by a pressure medium that penetrates the flow channel 4 through the inlet 4a and, when the pressure of the medium is sufficient, the so-called set pressure, exceeds the preload force of the spring element 7. Thus, the pressure relief valve 1 allows the pressure medium to flow out through at least one outlet 4b as soon as the pressure of the pressure medium at the inlet 4a exceeds the set pressure. The level of the set pressure depends essentially on the force with which the spring element 7 preloads the sealing element 5 into its closed position.

[0040] In order to reliably maintain the desired response pressure despite certain tolerances during the manufacture of the individual components 3, 5, 7 and 9 of the pressure relief valve 1, the bearing element 9 is fixed within the housing 3 via at least one plastic deformation 3b of the housing 3. This is only formed during the assembly of the pressure relief valve 1. As shown in particular in FIG. 2BAs shown, in the present exemplary embodiment, two opposing plastic deformations 3b are formed, each of which extends into a corresponding recess 9a formed in the bearing element 9. The formed deformations 3b form a positive connection with the corresponding recesses 9a, which blocks any movement of the bearing element 9 relative to the housing 3. In order to also obtain the desired response pressure for the pressure relief valve 1, the bearing element 9 is pushed into the receiving area against the force of the spring element 5 with a force that corresponds to the preload force required for the respective response pressure. This is shown in FIG. 2A As soon as the bearing element 9 has reached its relative position in the housing 3 corresponding to the respective insertion force, the corresponding plastic deformations 3b of the housing 3 are formed.

[0041] In practice, this is possible, for example, by clamping the housing 3 in a stationary manner and pressing the bearing element 9 into the receiving area 3a with the aid of an insertion device (not shown) with the predetermined force. The insertion device comprises a number of forming tools corresponding to the number of deformations to be formed, which are positioned at the level of the recesses 9a of the bearing element 9 and, as the bearing element 9 is inserted, move along the outside of the housing 3 together with the respective recesses 9a. When the insertion position, which corresponds to the respective insertion force, is reached, the forming tools are activated to form the respective plastic deformations 3b of the housing 3. The resulting plastic deformations 3b will therefore always protrude into the corresponding recesses 9a. The plastic deformations 3b are preferably formed by conical punches.

[0042] By this procedure, it is possible to fix the bearing element 9 in a simple and reliable manner at the relative position relative to the housing 3 corresponding to the respective predetermined preload force.

[0043] In order to increase the stability of the pressure relief valve 1 formed, the individual recesses 9a in the bearing element 9 and the corresponding deformations 3b of the housing 3 are or will be evenly distributed around the radial outer circumference of the bearing element 9 and in particular arranged in pairs opposite one another.

[0044] To better hold the spring element 7, the bearing element 9 in this case has a sleeve section 9b, which at least partially surrounds the spring element 7 transversely to its longitudinal direction. The described recesses 9a are or will be formed in the form of openings in the said sleeve section 9b.

[0045] However, other configurations for fixing the bearing element 9 to the housing 3 are also possible. In particular, it is also conceivable to design the bearing element 9 as a self-contained piston element and / or to form the recesses 9a merely as depressions on the outer circumference of the bearing element 9.

[0046] In this context, a particularly advantageous embodiment has been found in which the bearing element 9 is continuously displaceable in the axial direction of the receiving region 3a of the housing 3 before the at least one plastic deformation 3b of the housing 3 is formed. In other words, the relative position of the bearing element 9 with respect to the housing 3 can preferably be freely selected over a continuous range of relative positions.

[0047] To fix the bearing element 9 to the housing 2, only the formed plastic deformations 3b can serve and no further fixings can be formed, as is the case in the embodiment shown here.

[0048] If necessary, which is particularly the case for planned use with relatively high pressures, at least one further fixation can be provided between the bearing element 9 and the housing 3 in addition to the formed plastic deformations 3b. An example of such a further fixation is welding, in particular laser welding, of the housing 3 to the bearing element 9.

[0049] The pressure relief valve 1 shown here is further provided with a sealing ring 11, which, after the pressure relief valve 1 has been inserted into a corresponding door drive, enables a tight seal between the pressure relief valve 1 and the other components of the door drive.

[0050] The present invention relates not only to such a pressure relief valve 1, but also to a corresponding manufacturing method as well as a door drive and in particular to a door closer with such a pressure relief valve 1.

[0051] Here is a list of further examples: Embodiment (1): Pressure relief valve (1) for a door drive, in particular for a door closer, wherein the pressure relief valve (1) comprises: a housing (3) with a flow channel (4) formed therein; a sealing element (5) which is provided in the housing (3) so as to be movable between a closed position, in which it closes the flow channel (4), and an open position, in which it releases the flow channel (4); a spring element (7); and a bearing element (9) which is inserted in an axial direction into a receiving area (3a) of the housing (3) and is fixed in the housing (3); wherein the spring element (7) is clamped between the bearing element (9) and the sealing element (5) within the housing (3) in such a way that it preloads the sealing element (5) from its open position to its closed position, wherein the bearing element (9) is fixed in the housing (3) via at least one plastic deformation (3b) of the housing (3).and via the at least one plastic deformation (3b), the bearing element (9) is fixed in that relative position in the housing (3) in which the sealing element (5) is preloaded into its closed position by the spring element (7) with a predetermined force. Embodiment (2): Pressure relief valve (1) according to embodiment (1), wherein the bearing element (9) has at least one recess (9a) in a radial outer circumference of the bearing element (9), and the at least one plastic deformation (3b) of the housing (3) projects into the at least one recess (9a) in order to establish an axial relative positioning of the bearing element (9) with respect to the housing (3) and, in particular, to form a positive connection with the respective recess (9a). Embodiment (3): Pressure relief valve (1) according to embodiment (2),wherein the bearing element (9) has at least two separate such recesses (9a) and the housing (3) has at least two separate corresponding plastic deformations (3b), each of the plastic deformations (3b) protruding into one of the separate recesses (9a). Embodiment (4): Pressure relief valve (1) according to embodiment (3), wherein the separate recesses (9a) and the corresponding separate plastic deformations (3b) are evenly distributed around the radial outer circumference of the bearing element (9). Embodiment (5): Pressure relief valve (1) according to embodiment (4), wherein the separate recesses (9a) and the corresponding separate plastic deformations (3b) are each distributed in pairs opposite one another around the radial outer circumference of the bearing element (9). Embodiment (6): Pressure relief valve (1) according to one of the preceding embodiments, wherein the bearing element (9) has a sleeve portion (9b),which at least partially surrounds the spring element (7) transversely to the longitudinal direction of the spring element (7). Embodiment (7): Pressure relief valve (1) according to embodiment (6), wherein the respective recess (9a) is formed by a respective opening in the sleeve section (9b) of the bearing element (9). Embodiment (8): Pressure relief valve (1) according to one of the preceding embodiments, wherein the bearing element (9) is designed such that, before the at least one plastic deformation (3b) of the housing (3) is formed, it is continuously displaceable in the axial direction of the receiving area (3a) of the housing (3). Embodiment (9): Pressure relief valve (1) according to one of the preceding embodiments,wherein, in addition to the plastic deformation(s) (3b) formed, no further fixation is provided between the bearing element (9) and the housing (3). Embodiment (10): Pressure relief valve (1) according to one of the embodiments (1) to (8), wherein, in addition to the plastic deformation(s) (3b) formed, at least one further fixation is provided between the bearing element (9) and the housing (3). Embodiment (11): Pressure relief valve (1) according to embodiment (10), wherein at least one further fixation is formed by welding, in particular by laser welding, the housing (3) to the bearing element (9). Embodiment (12): Door drive, in particular a door closer, with a pressure relief valve (1) according to one of the preceding embodiments. Embodiment (13): Method for producing a pressure relief valve (1) for a door drive, in particular for a door closer,in particular for producing a pressure relief valve (1) according to one of the embodiments (1) to (11), wherein the method comprises at least the following steps: providing a housing (3) with a flow channel (4) formed therein and a receiving area (3a); introducing a sealing element (5) and a spring element (7) into the receiving area (3a) of the housing (3) such that the sealing element (5) is provided in the housing (3) so as to be movable between a closed position, in which it closes the flow channel (4), and an open position, in which it releases the flow channel (4); positioning a bearing element (9) in the receiving area (3a) of the housing (3) such that the spring element (7) is clamped between the sealing element (5) and the bearing element (9),that the spring element (7) prestresses the sealing element (5) from its open position into its closed position; wherein the fixing of the bearing element (9) within the housing (3) is achieved by the formation of at least one plastic deformation (3a) of the housing (3) at a position in which the sealing element (5) is prestressed into its closed position by the spring element (7) with a predetermined force. Embodiment (14): Method according to embodiment (13), wherein, during assembly of the pressure relief valve (1), the bearing element (9) is pushed into the receiving area (3a) with a force corresponding to the predetermined prestressing force against the force of the spring element (7), and the bearing element (9) is fixed in the thus obtained relative position relative to the housing (3) by the formation of the at least one plastic deformation (3a). Embodiment (15): Method according to one of embodiments (13) and (14),wherein, prior to positioning the bearing element (9) in the receiving area (3a), at least one recess (9a) is formed in a radial outer circumference of the bearing element (9), and wherein the at least one plastic deformation (3b) of the housing (3) is formed such that it projects into the at least one recess (9a) in order to establish an axial relative positioning of the bearing element (9) with respect to the housing (3) and, in particular, to form a positive connection with the respective recess (9a). Embodiment (16): Method according to embodiment (15), wherein at least two separate such recesses (9a) are formed in the radial outer circumference of the bearing element (9), and at least two separate plastic deformations (3b) are formed in the housing (3) such that each of the plastic deformations (3b) projects into one of the separate recesses (9a). Embodiment (17): Method according to embodiment (16),wherein the separate recesses (9a) in the bearing element (9) and the corresponding separate deformations (3b) of the housing (3) are formed uniformly distributed around the radial outer circumference of the bearing element (9). Embodiment (18): Method according to embodiment (17), wherein the separate recesses (9a) in the bearing element (9) and the corresponding separate deformations (3b) of the housing (3) are formed in pairs opposite one another distributed around the radial outer circumference of the bearing element (9). Embodiment (19): Method according to one of embodiments (13) to (18), wherein the at least one plastic deformation (3b) of the housing (3) is formed by means of a conical punch. Embodiment (20): Method according to one of embodiments (13) to (19),wherein, in addition to the plastic deformation(s) (3b) formed, no further fixation is formed between the bearing element (9) and the housing (3). Embodiment (21): Method according to one of the embodiments (13) to (19), wherein, in addition to the plastic deformation(s) (3b) formed, at least one further fixation is formed between the bearing element (9) and the housing (3). Embodiment (22): Method according to embodiment (21), wherein at least one further fixation is formed by welding, in particular by laser welding, the housing (3) to the bearing element (9). List of reference symbols

[0052] 1 Pressure relief valve 3 Housing 3a Receptacle 3b Deformation 3c Recess 4 Flow channel 4a Inlet 4b Outlet 5 Sealing element 7 Spring element 9 Bearing element 9a Recess 9b Sleeve section 9c Clip contour or formation 11 Sealing ring

Claims

1. A pressure relief valve (1) for a door drive, in particular for a door closer, wherein the pressure relief valve (1) comprises: a housing (3) with a flow channel (4) formed therein; a sealing element (5) which is provided in the housing (3) so as to be movable between a closed position, in which it closes the flow channel (4), and an open position, in which it releases the flow channel (4); a spring element (7); and a bearing element (9) which is inserted in an axial direction into a receiving area (3a) of the housing (3) and fixed in the housing (3); wherein the spring element (7) is clamped between the bearing element (9) and the sealing element (5) within the housing (3) in such a way that it preloads the sealing element (5) from its open position to its closed position, characterized in thatthe bearing element (9) is fixed in the housing (3) via at least one plastic deformation (3b) of the latter, and via the at least one plastic deformation (3b) the bearing element (9) is fixed in that relative position in the housing (3) in which the sealing element (5) is prestressed into its closed position by the spring element (7) with a predetermined force.

2. Pressure relief valve (1) according to claim 1, wherein the bearing element (9) has at least one recess (9a) in a radial outer circumference of the bearing element (9), and the at least one plastic deformation (3b) of the housing (3) projects into the at least one recess (9a) in order to define an axial relative positioning of the bearing element (9) with respect to the housing (3) and in particular to form a positive connection with the respective recess (9a).

3. Pressure relief valve (1) according to claim 2, wherein the bearing element (9) has at least two separate such recesses (9a) and the housing (3) has at least two separate corresponding plastic deformations (3b), wherein each of the plastic deformations (3b) projects into one of the separate recesses (9a), in particular wherein the separate recesses (9a) and the corresponding separate plastic deformations (3b) are distributed evenly around the radial outer circumference of the bearing element (9), in particular wherein the separate recesses (9a) and the corresponding separate plastic deformations (3b) are each distributed in pairs opposite one another around the radial outer circumference of the bearing element (9).

4. Pressure relief valve (1) according to one of the preceding claims, wherein the bearing element (9) has a sleeve portion (9b) which at least partially surrounds the spring element (7) transversely to the longitudinal direction of the spring element (7), in particular wherein the respective recess (9a) is formed by a respective opening in the sleeve portion (9b) of the bearing element (9).

5. Pressure relief valve (1) according to one of the preceding claims, wherein the bearing element (9) is designed such that, before formation of the at least one plastic deformation (3b) of the housing (3), it is continuously displaceable in the axial direction of the receiving region (3a) of the housing (3).

6. Pressure relief valve (1) according to one of the preceding claims, wherein apart from the plastic deformation(s) (3b) formed, no further fixing is provided between the bearing element (9) and the housing (3).

7. Pressure relief valve (1) according to one of claims 1 to 5, wherein in addition to the plastic deformation(s) (3b) formed, at least one further fixing is provided between the bearing element (9) and the housing (3), in particular wherein at least one further fixing is formed by welding, in particular by laser welding, of the housing (3) to the bearing element (9).

8. Door drive, in particular door closer, with a pressure relief valve (1) according to one of the preceding claims.

9. A method for producing a pressure relief valve (1) for a door drive, in particular for a door closer, in particular for producing a pressure relief valve (1) according to one of claims 1 to 7, wherein the method comprises at least the following steps: providing a housing (3) with a flow channel (4) formed therein and a receiving area (3a); introducing a sealing element (5) and a spring element (7) into the receiving area (3a) of the housing (3) such that the sealing element (5) is provided in the housing (3) so as to be movable between a closed position, in which it closes the flow channel (4), and an open position, in which it releases the flow channel (4);Positioning a bearing element (9) in the receiving area (3a) of the housing (3) such that the spring element (7) is clamped between the sealing element (5) and the bearing element (9) such that the spring element (7) prestresses the sealing element (5) from its open position to its closed position; ; characterized by the fixing of the bearing element (9) within the housing (3) by the formation of at least one plastic deformation (3a) of the housing (3) at a position in which the sealing element (5) is prestressed into its closed position by the spring element (7) with a predetermined force.

10. The method according to claim 9, wherein during assembly of the pressure relief valve (1) the bearing element (9) is pushed into the receiving area (3a) with a force corresponding to the predetermined prestressing force against the force of the spring element (7) and the bearing element (9) is fixed in the thus obtained relative position with respect to the housing (3) by the formation of the at least one plastic deformation (3a).

11. Method according to one of claims 9 and 10, wherein, prior to positioning the bearing element (9) in the receiving area (3a), at least one recess (9a) is formed in a radial outer circumference of the bearing element (9), and wherein the at least one plastic deformation (3b) of the housing (3) is formed such that it projects into the at least one recess (9a) in order to establish an axial relative positioning of the bearing element (9) with respect to the housing (3) and, in particular, to form a positive connection with the respective recess (9a), in particular wherein at least two separate such recesses (9a) are formed in the radial outer circumference of the bearing element (9), and at least two separate plastic deformations (3b) are formed in the housing (3) such that each of the plastic deformations (3b) projects into one of the separate recesses (9a).in particular, wherein the separate recesses (9a) in the bearing element (9) and the corresponding separate deformations (3b) of the housing (3) are formed uniformly distributed around the radial outer circumference of the bearing element (9), in particular, wherein the separate recesses (9a) in the bearing element (9) and the corresponding separate deformations (3b) of the housing (3) are formed in pairs opposite one another distributed around the radial outer circumference of the bearing element (9).

12. Method according to one of claims 9 to 11, wherein the at least one plastic deformation (3b) of the housing (3) is formed by means of a conical punch.

13. Method according to one of claims 9 to 12, wherein in addition to the plastic deformation(s) (3b) formed, no further fixing is formed between the bearing element (9) and the housing (3).

14. Method according to one of claims 9 to 12, wherein in addition to the plastic deformation(s) (3b) formed, at least one further fixing is formed between the bearing element (9) and the housing (3).

15. The method according to claim 14, wherein at least one further fixation is formed by welding, in particular by laser welding, the housing (3) to the bearing element (9).