Check valve and connecting device for check valve

Abstract

The present invention relates to a check valve, in particular a check valve for a refrigeration circuit or a heat circuit, which can be inserted into a connection point of a connection device. The check valve includes a supply opening for supplying a medium and an outlet opening for discharging the medium. The check valve: includes a multi-component housing, which includes a valve housing and a main housing that are interconnected by means of a connection element via a joining structure; includes an adjustment space formed between the main housing and the valve housing, and a valve closing member is arranged in the adjustment space. The valve closing member abuts against a valve seat of the valve housing in the closed position and closes an opening in the valve housing, and can be moved against the actuating force of a return element to an operating position and release the valve opening. Among them, the valve housing and the valve closing member arranged to be movable in the adjustment space are located on a common longitudinal axis. Among them, the joining structure between the valve housing and the main housing has an axial clearance, and by means of the axial clearance, the distance between the valve housing and the main housing can be changed.

Description

Field of the Invention

[0001] The present invention relates to a check valve, in particular a check valve for a refrigeration circuit or a thermal circuit, and to a connecting device for such a check valve. Background Art

[0002] A check valve is known from JP 2001280521 A. Such a check valve includes a multi-component housing, which includes a valve housing and a main housing. In the valve housing, a valve closing member is provided which cooperates with a valve seat in an initial position and closes a valve opening. A guiding portion extending through the main housing is provided on the valve closing member. At an upper end opposite the valve seat, the valve housing includes an opening, and once the main housing is positioned relative to the valve housing such that the valve closing member is located therebetween, a fastener on the main housing engages. In this case, the fastener engages with the valve housing in a rigid and interlocking manner by means of an undercut. In such a check valve, the flow direction of the medium lies on the axial longitudinal axis of the valve housing and the main housing, and the opening and closing movement of the valve closing member takes place along this axial longitudinal axis. Summary of the Invention

[0003] The object of the present invention is to provide a check valve, in particular a check valve for a refrigeration circuit or a thermal circuit, which is easier to install in a connection point of a connecting device in order to control the flow rate of a medium.

[0004] This object is achieved by a check valve in which an engagement structure is formed between the valve housing and the main housing by means of a connecting element such that the engagement structure between the valve housing and the main housing has a play in the axial direction of the check valve, and the distance between the valve housing and the main housing can be changed by means of this engagement structure. The engagement structure can preferably be formed by connecting elements that snap together. This arrangement has the advantage that due to tolerance compensation in the axial direction, it is easier to install the check valve at the connection point of the connecting device. In the check valve, a sealing arrangement of the valve housing relative to the connection point and a sealing arrangement of the main housing relative to the connection point are preferably provided, and when observed in the axial direction, tolerances may correspondingly occur in terms of the length and / or distance of the connection portion or insertion portion of the receiving valve housing and the connection portion or insertion portion of the main housing. By means of a configuration of the check valve in which the valve closing member and the body have an axial play and the total length thereof can be changed at least to some extent by this axial play, these tolerances can be compensated at least within a limited range.

[0005] Preferably, the main housing and the valve housing are guided so as to be relatively movable along their longitudinal axes. Thus, the total length of the check valve can be changed in a simple manner by the degree of axial play, which means that there are increased tolerances when installing the check valve in the connecting device.

[0006] Advantageously, the engagement structure of the valve housing and the main housing is guided to be rotatable radially relative to each other. This has the advantage that when installing the check valve in the connection point, no preferred direction is required. Instead, the valve can be inserted into the connection point of the connecting device in any direction.

[0007] Another advantageous configuration of the check valve enables the engagement structure to include connection elements that form a detachable connection. Thus, a worn part of the check valve, such as the valve housing and / or the valve closing member, can also be replaced.

[0008] The connection elements of the check valve are preferably formed by a circumferential groove and at least one snap clip, preferably a plurality of snap clips. In this case, preferably the circumferential groove is provided in the main housing, while at least one snap clip is formed on the valve housing. They can also be interchanged. To create a clearance, preferably the length of the snap clip from the undercut to the end face end of the snap clip is less than the width of the circumferential groove. Thus, the axial clearance can be determined and limited in a simple manner.

[0009] The connection elements for forming the engagement structure preferably each include guiding surfaces facing each other. The guiding surface on the main housing extends from the circumferential groove towards the valve housing, and the guiding surface of the connection element adjacent to the undercut extends in the groove. Thus, the engagement structure can withstand more stress.

[0010] Furthermore, preferably a circumferential guiding flange is provided on the valve housing and points towards the main housing. When viewed from the radial direction, the flange is preferably interrupted by the at least one connection element, in particular by at least one snap clip. Thus, the function of the snap clip is separated from the guiding flange, and preferably both the connection element and the guiding flange can act on the inner peripheral wall of the main housing.

[0011] The valve housing is preferably guided axially displaceably and / or radially rotatably on the guiding surface of the main housing by means of a guiding flange opposite the valve seat. This enables the valve housing to be firmly positioned relative to the main housing. At the same time, the valve closing member can thus also be safely received in the adjustment space formed between the valve housing and the main housing.

[0012] The size of the clearance or axial mobility between the valve housing and the body is preferably configured as follows. In the arrangement with clearance of the connection elements in the engagement structure relative to each other, the distance between the mounting surface or mounting part provided on the main housing and the end face of the valve housing opposite the main housing has a mounting length A that is less than the mounting dimension E in the connection point of the connecting device. When the main housing is arranged without clearance relative to the valve housing, i.e., when the valve housing is in the pulled-out position relative to the main housing, the check valve has a dimension from the mounting surface or mounting part of the main housing until the end face of the valve housing that is greater than the mounting dimension E.

[0013] Another preferred configuration of the check valve causes the valve housing to include a valve opening that is oriented along a longitudinal axis toward the valve housing and from which a radial wall portion begins, and at least a valve element for engaging the structure is provided at an end of the radial wall portion opposite the valve opening. The valve housing is thus cage-shaped. The valve closure member is guided to move along the longitudinal axis of the cage-shaped valve housing within the valve housing.

[0014] Furthermore, preferably a through-hole is provided in the radial wall portion of the valve housing and extends and elongates in the circumferential direction, and a connecting member connecting the valve seat to at least one connecting element of the valve housing extends between the through-holes. This arrangement enables the flow of the medium to be deflected 90° by the check valve, for example, by axially supplying the flow to the valve housing and discharging it in the radial direction through the through-holes in the valve housing.

[0015] Advantageously, a guide rod or a guide portion is provided on the valve closure member, and the guide rod or the guide portion extends into the main housing and is guided longitudinally movably within the main housing. Advantageously, a return element is provided between the main housing and the valve closure member. Thus, the return element can be set in the initial position or the closed position in a simple manner.

[0016] Advantageously, the check valve can consist of only four components, namely the main housing, the valve housing, the valve closure member, and the return element. Two or three sealing elements, in particular sealing rings, are preferably sufficient, one of which is provided on the valve housing and one is provided on the main housing to seal the corresponding connection points at the connection points, and optionally one sealing element is provided on the valve closure member.

[0017] The valve closure member preferably includes guide fins opposite the closed surface adjacent to the valve closure member, and the guide fins extend parallel to the longitudinal axis of the valve closure member. In addition to the guide element movably received in the main housing, the valve closure member can also be guided by these guide fins. In particular, when the flow is axially supplied and deflected radially, the eccentric orientation of the valve closure member relative to the longitudinal axis or the opening of the valve housing can thus be prevented.

[0018] Advantageously, the guide fins include end faces pointing in the radially outward direction, and the axial length of the end faces is greater than the width of the through-hole. Thus, in the starting position of the valve closure member, the guide fins extend through the through-holes in the radial wall portion. Thus, the valve closure member can be safely guided within the valve housing regardless of the opening movement. In addition, due to the height of the guide fins on the valve closure member, the opening movement of the valve closure member within the valve housing can be limited by the guide fins abutting against the body.

[0019] Another preferred configuration of the check valve causes the valve seat of the valve housing to include a support surface that points towards the valve opening, the valve closing member abuts against the support surface in the closed position, the valve seat of the valve housing further includes a sealing surface, and the sealing element of the valve closing member abuts against the sealing surface. The support surface and the sealing surface are formed separately relative to each other. Advantageously, the support surface and the sealing surface can be directly adjacent to each other. This arrangement has the following advantages: the closing movement and the closed position of the valve closing member are delimited by the support surface. The sealing element of the valve closing member can abut against the sealing surface, with a sealing effect, without the entire closing force of the valve closing member acting on the sealing element. Therefore, by using the material of the sealing element, leakage or premature wear of the sealing element can be prevented.

[0020] Furthermore, preferably, the bearing surface of the valve seat is oriented at an angle of 10° to 90° with respect to the longitudinal axis of the valve housing. The sealing surface is preferably formed at an angle of 90° or less than 90° with respect to the longitudinal axis. In order to form the valve seat, the sealing surface is preferably oriented at an angle that is less than or greater than the angle of the support surface.

[0021] If the orientation angle of the sealing surface is less than the orientation angle of the support surface, preferably, radial sealing of the valve seat can be achieved. If the orientation angle of the sealing surface is greater than the orientation angle of the support surface, an axially acting seal can also be provided.

[0022] By means of the axial distance between the sealing surface and the support surface on the valve seat, the contact pressure of the sealing element of the valve closing member can be preferably adjusted. This enables the sealing element to be positioned in a sealed manner on the valve closing member when the valve closing member is in the closed position on the valve seat, and also enables an excessive contact pressure not to act on the sealing element to prevent the sealing element from yielding or jamming.

[0023] The sealing element can be mounted on, clamped on, or pressed onto the valve closing member. For radial sealing, preferably, the seal is introduced or embedded into a circumferential groove, for example, in the form of an O-ring. Alternatively, the sealing element can also be vulcanised to the valve closing member. Similarly, the valve closing member can also be designed as a two-component part, and the sealing element made of an elastomer and the valve closing member made of a thermoplastic material are manufactured as an integral part thereon. The seal acting axially can be particularly formed in such a two-component part. In addition, the sealing element can be combined with the valve closing member and / or can be positioned on the valve closing member in an interlocking fit.

[0024] The valve housing and the valve closing member are preferably made of plastic material. For example, the main housing can also be made of plastic material or metal material, especially light metal or similar materials. Preferably, aluminum or aluminum alloy or similar materials can be used.

[0025] The object to be solved by the present invention is also achieved by a connecting device for a check valve, in particular for a check valve according to any of the above embodiments. The connection point in the base body of the connecting device includes a supply opening and an outlet opening. A first insertion part is provided between the supply opening and the outlet opening, in which the valve housing can be positioned. And a second insertion part is provided between the supply opening and the outlet opening of the connection point, in which the main housing of the check valve can be fixed. The main housing of the check valve is fixed in the second insertion part in the axial direction to the connection point by means of a detachable fastening element. The valve housing is positioned in the first insertion part so as to be movable in the axial direction. By means of the check valve, in which the valve housing and the main housing are arranged to be movable relative to each other with an axial clearance, especially in the engagement structure between the main housing and the valve housing, a simple and firm installation can be achieved at such a connection point. The tolerance between the connection point of the connecting device and / or between the first and second insertion parts in the mounting dimensions of the check valve can be compensated especially in the axial direction.

[0026] In this connecting device, preferably, the check valve is fixed in the second insertion part by means of a detachable fastening element. The main housing is supported on the shoulder of the second insertion part by a stop surface. The main housing is limited to be fixed relative to the shoulder by the detachable fastening element, and the detachable fastening element acts on the mounting part of the main housing opposite to the stop surface. For simple installation, the main housing can be arranged in the second insertion part with a minimal clearance. This enables the check valve to be fixed to the connection point in a simple manner. Especially by designing the detachable fastening element as a snap ring, the check valve can be quickly installed and fixed to the connection point. For example, the detachable fastening element can be designed as a circlip or a spring ring. This enables a simple installation to be achieved. In addition, the fastening flange can also be provided with a thread, a rotary snap connection structure, a bayonet catch or the like as the detachable fastening element.

[0027] Furthermore, preferably, sealing elements are provided both between the main housing and the second insertion part and between the valve housing and the first insertion part. The sealing element is preferably oriented to act on the main housing and the valve housing in the radial direction. Thus, reliable sealing can be achieved between the regulating space and the outlet opening of the check valve and between the supply opening and the regulating space. In addition, the connection point can also be simply inserted. Description of the Drawings

[0028] The present invention and its advantageous embodiments and developments will be described and explained in more detail below with reference to the examples shown in the drawings. The features found in the description and the drawings can be implemented alone or in any combination according to the present invention. In the drawings:

[0029] Figure 1 is a perspective view of the check valve,

[0030] Figure 2 is an exploded view of a check valve,

[0031] Figure 3 is a perspective view of a valve closing member,

[0032] Figure 4 is a schematic cross-sectional view of a check valve in a closed position,

[0033] Figure 5 is a schematic cross-sectional view of a check valve in an open position,

[0034] Figure 6 is a schematic partial view of another configuration of a valve closing member in a valve housing,

[0035] Figure 7 is a schematic cross-sectional view of a check valve in a closed state at a connection point of a connecting device, and

[0036] Figure 8 is a schematic cross-sectional view of a check valve in an operating position at a connection point of a connecting device. Detailed implementation mode

[0037] Figure 1 is a perspective view of a check valve 11. The check valve 11 includes a main housing 12 and a valve housing 14. The valve housing 14 is connected to the main housing 12 via a joining structure 16.

[0038] Figure 2 is according to Figure 1 an exploded view of the check valve 11. From this exploded view, the various components and structures of the check valve 11 can be seen.

[0039] The valve housing 14 is preferably formed as a single piece. The valve housing 14 preferably has a cage-like structure. A valve opening 22 surrounded by a valve seat 23 is provided on an end face 21 of the valve housing 14 opposite to the main housing 12. A valve closing member 25 for opening and closing the valve opening 22 is provided in the valve housing 14. The valve closing member 25 includes a closing surface 26. A sealing element 27 is provided adjacent to the closing surface 26. Preferably, the sealing element 27 is provided in a circumferential (circular) groove of the valve closing member 25 in the radial direction.

[0040] The valve closing member 25 further includes a guiding portion 29, and the guiding portion 29 is guided in a guiding hole 31 in the main housing 12. A return element 33 is provided between the valve closing member 25 and the main housing 12. The return element 33 is preferably guided by the guiding portion 29 and is limited between the valve closing member 25 and the main housing 12.

[0041] The main housing 12 includes an external circumferential (peripheral) groove 35 configured to receive a sealing element 36. A stop surface 37 is provided on the main housing 12 adjacent to the groove 35 and pointing towards the valve housing 14. Conversely, a mounting surface or mounting portion 38 is arranged on the main housing 12. The main housing 12 is, for example, cylindrical. A surface may be provided, for example, on the outer end face 39 for arranging, receiving or embedding information, such as a code, order number, inspection number or similar information. The outer end face 39 may be arranged flush with the mounting surface 38 or may be provided on a cylindrical housing portion 40 which is preferably raised relative to the mounting surface 38. The diameter of the cylindrical housing portion 40 on the main housing 12 is preferably 20% to 80% of the diameter of the opening 77 in the connection point 76 of the connecting device 71 ( Figure 7 ).

[0042] The engagement structure 16 formed between the main housing 12 and the valve housing 14 includes connecting elements 41, 42. One of the connecting elements 41 is formed by a snap-in clip, preferably by a plurality of snap-in clips, which are provided on the valve housing 14. As Figure 4 shown, one of the connecting elements 42 of the engagement structure 16 is formed by an internal circumferential groove on the main housing 12. Thus, the valve housing 14 can be inserted into the main housing 12 and the snap-in clip 41 engages with the internal circumferential groove. Preferably, the engagement structure 16 can be designed as a detachable connection.

[0043] In order to position the valve housing 14 centrally relative to the main housing 12, a guide flange 44 is provided on the valve housing 14 opposite to the end face 21. The guide flange 44 is formed radially in sections. Advantageously, the snap-in clip 41 is provided between the guiding surfaces of the guide flange 44 which extend circumferentially in the radial direction.

[0044] A through hole 46 extending in the radial direction is preferably provided between the guiding surface of the valve housing 14 and the end face 21. A connecting piece 47 which positions the guiding part spaced apart from the valve seat 23 extends between the through holes 46.

[0045] The valve housing 14 allows the medium to flow axially through the valve opening 22 and then laterally out through the through holes 46 in the radial direction. The valve housing 14 including the above components is preferably integrally formed as an injection molding. The main housing 12 is likewise preferably formed as a single piece. It can be composed of plastic material or metal, especially light metal.

[0046] Figure 3is a perspective view of the valve closing member 25. The guiding fins 51 are provided on the side opposite to the closing surface 26. For example, three guiding fins 51 are provided on the valve closing member 25, and are preferably evenly distributed circumferentially. The guiding fins 51 include end faces 52 pointing radially outwards. These end faces 52 abut against the inner surface of the valve housing 14 and guide the valve closing member 25 during the opening and closing movements. The length of the end faces 52 has a height that extends at least beyond the width of the through-hole 46 in the axial direction. Thus, starting from the closed position 54 ( Figure 4 ) of the valve closing member 25 to the opening movement, the valve closing member 25 is axially guided without getting stuck in the through-hole 46.

[0047] Figure 4 is a schematic cross-sectional view of the check valve 11 in the assembled arrangement according to Figure 1 described above. The valve closing member 25 is set in the closed position 54. Figure 5 is a schematic cross-sectional view of the check valve 11, in which the valve closing member 25 is shown in the open position 55. An adjustment space 24 is provided between the main housing 12 and the valve housing 14. Inside the adjustment space 24, the valve closing member 25 can be actuated between the closed position 54 and the open position 55. The maximum open position 55 of the valve closing member 25 can be defined by the length of the guiding fins 51 and / or the guiding part 29.

[0048] The return element 33 is preferably received and guided by the hole part 32, which is enlarged compared to the guiding hole 31 in the main housing 12. The depth of the hole part 32 can be correspondingly configured to be able to determine the preload of the return element 33.

[0049] According to Figure 4 and 5 the cross-sectional view shows the engagement structure 16, which is preferably detachable.

[0050] The first and second connecting elements 41, 42 of the engagement structure 16 are arranged relative to each other with an axial clearance. For this purpose, the distance between the end face 58 and the undercut 59 of the snap clip 41 of the snap clip 41 is made smaller than the width of the circumferential groove. Thus, the valve housing 14 is arranged with an axial clearance relative to the main housing 12.

[0051] The valve housing 14 includes a valve seat 23 which includes a support surface 61 and a sealing surface 62. The closing surface 26 of the valve closing member 25 abuts against the support surface 61 in the closed position 54. The sealing element 27 of the valve closing member 25 abuts against the sealing surface 61 in the closed position 54, and the sealing surface 61 is arranged adjacent to the support surface 61 or downstream of the support surface 61 in the flow direction. The support surface 61 and the sealing surface 62 are formed separately from each other. They are preferably adjacent to each other. By means of the support surface 61, the valve closing member 25 assumes a defined closed position 54. By axially positioning the sealing surface 62 relative to the support surface 61, the sealing element 27 can abut against the sealing surface 62 with a predetermined contact pressure. This contact pressure is less than the abutting pressure of the valve closing member 25 on the support surface 61. This prevents the sealing element 27 from being over-pressed or jammed.

[0052] In an embodiment according to Figure 5 the support surface 61 is oriented at an angle α relative to the longitudinal axis 64 of the valve housing 14 or the main housing 12, and the angle α is, for example, in the range of 10° to 90°. The sealing surface 62 is oriented at an angle β relative to the longitudinal axis 64 of the valve housing 14, and the angle β is less than the angle α. In this arrangement, the sealing element 27 can have a sealing effect in the radial direction.

[0053] Figure 6 is a schematic cross-sectional view of another embodiment of the valve closing member 25 relative to the valve seat 23. In this embodiment, the angle β formed by the sealing surface 62 relative to the longitudinal axis 64 of the valve seat is greater than the angle α of the support surface 61 relative to the longitudinal axis 64 of the valve seat. Preferably, the sealing surface 62 is arranged at a right angle relative to the longitudinal axis 64 of the valve housing 14. The sealing element 27 acts on the circumferential shoulder of the valve closing member 25, thereby providing axial sealing.

[0054] In this embodiment of the valve closing member 25 and the valve seat 23, the sealing element 27 can be formed on the valve closing member 25 as a two-component injection molding. The sealing element 27 can also be joined or fixed thereto in an interlocking fit.

[0055] In Figure 7In [description], the check valve 11 is arranged in the connecting device 71. The connecting device 71 may include at least one supply opening 72 and at least one discharge opening 74. A connection point 76 is provided between the supply opening 72 and the discharge opening 74, and the medium is guided through the connection point 76. The check valve 11 can be inserted into the connection point 76 through the opening 77 and can be fixed to the connection point 76. The connection point 76 preferably includes a first insertion part 78, in which the valve housing 14 is positioned. In addition, the connection point 76 includes a second insertion part 79, in which the main housing 12 is positioned. When the check valve 11 is inserted into the connection point 76, the stop surface 37 of the main housing 12 preferably abuts against or is supported on the shoulder 81 of the second insertion part 79. A detachable fastening structure 82 is introduced into the connection point 86 here. The detachable fastening structure 82 acts on the mounting surface 38 of the main housing 12 and fixes the check valve 11 in the connection point 76. The detachable fastening structure 82 can be designed, for example, as a circlip, which can be fixed in the circumferential groove 83.

[0056] The check valve 11 preferably has a mounting dimension E, which is determined by the distance between the mounting surface 38 of the main housing 12 and the end face 21 of the valve housing 14. In addition, an axial clearance B is provided between the first and second connecting elements 41, 42 at the engagement structure 16. The mounting length A can be enlarged or extended by the length of the axial clearance B.

[0057] The connection point 76 is provided with a mounting dimension E including the first and second insertion parts 78, 79. When the valve housing 14 is positioned relative to the main housing 12, the mounting length A of the check valve 11 is smaller than the mounting dimension E. Therefore, it is easier to mount the check valve 11 relative to the connection point 76. Once pressure acts on the check valve 11 due to the medium, the valve housing 14 can move axially relative to the main housing 12 due to the clearance B. Here, the end face 21 of the valve housing 14 can abut against the end face of the first insertion part 78, but the first and second connecting elements 41, 42 are still positioned relative to each other with a very small clearance or without clearance relative to each other. Therefore, the tolerances of the first insertion part 78 and additional tolerances in the positioning relative to the second insertion part 79 can be compensated.

[0058] From Figure 7 and Figure 8As can be seen, both the main housing 12 and the valve housing 14 are arranged to be sealed relative to the first and second connection portions 78, 79 by means of the sealing element 36. Thus, once the valve closure member 25 is moved out of the closed position 54 to the open position 55, the medium flows from the supply opening 72 in the regulating space 24 of the valve housing 14 through the check valve 11. Then, the medium flows through the through-hole 46 in the valve housing 14 into the annular channel 84 in the connection point 76 and flows out from there through the discharge opening 74.

Claims

1. A check valve that can be inserted into a connection point (76) of a connection device (71), the check valve including a supply opening (72) for supplying a medium and an outlet opening (74) for discharging the medium, the check valve: - includes a multi-component housing (12, 14) that includes a valve housing (14) and a main housing (12) interconnected by a joining structure (16) by means of connection elements (41, 42), - including an adjustment space (24) formed between a main housing (12) and a valve housing (14), a valve closing member (25) is disposed in the adjustment space, the valve closing member abuts a valve seat (23) of the valve housing (14) at a closed position (54) and closes an opening (22) in the valve housing (14), and is movable against the actuating force of a return element (33) to an operating position (55) and release the valve opening (22), wherein, The valve housing (14) and a valve closing member (25) arranged to be movable in an adjustment space (24) are located on a common longitudinal axis (64), - The joining structure (16) between the valve housing (14) and the main housing (12) has an axial clearance, by means of which the distance between the valve housing (14) and the main housing (12) can be changed, It is characterized in that The main housing (12) is fixed to the connection point (76) by means of a mounting portion (38) provided on the main housing (12) through a detachable fastening element (82). When the main housing (12) is arranged relative to the valve housing (14) with a clearance B, the distance between the mounting portion (38) and the end face (21) on the valve housing (14) opposite to the main housing (12) has a mounting length A that is less than the mounting dimension E in the connection point (76). When the main housing (12) is arranged relative to the valve housing (14) without clearance, the lengths of the main housing (12) and the valve housing (14) are greater than or equal to the mounting dimension E in the connection point (76).

2. The check valve according to claim 1, characterized in that, The main housing (12) and the valve housing (14) are guided to be movable relative to each other along the longitudinal axis (64) by means of the axial clearance of the joining structure (16), and / or the main housing (12) and the valve housing (14) are guided to be rotatable relative to each other in the radial direction.

3. The check valve according to claim 1, wherein The joining structure (16) includes connection elements (41, 42) that form a detachable connection between the main housing (14) and the valve housing (12).

4. The check valve according to claim 3, characterized in that, The first connection element (42) forming the joining structure (16) is designed as a circumferential groove, and the second connection element (41) consists of at least one snap clip engaged in the first connection element (42), wherein the length of the snap clip from the undercut portion (59) on the snap clip to the end face end (58) of the snap clip is less than the width of the circumferential groove.

5. The check valve according to claim 4, characterized in that, The connection elements (41, 42) each include guiding surfaces facing each other, wherein the guiding surface on the main housing (12) extends axially from the circumferential groove towards the valve housing (14), and the guiding surface arranged on the undercut portion (59) of the snap clip extends in the circumferential groove.

6. The check valve according to claim 1, characterized in that, A circumferential guiding flange (44) is provided on the valve housing (14) pointing towards the main housing (12), and the valve housing (14) is guided to be axially movable and / or radially rotatable on the guiding surface of the main housing (12) by means of the guiding flange.

7. The check valve according to claim 6, characterized in that, The guiding flange (44) is designed to interrupt at least one connection element (41) of the snap clip.

8. The check valve according to claim 1, characterized in that, The check valve is a check valve for a refrigeration circuit or a heat circuit.

9. The check valve according to claim 3, characterized in that, The valve housing (14) includes a valve opening (22) which is oriented towards the valve housing (14) along a longitudinal axis (64). A radial wall portion adjoins the valve opening (22), and at least one connecting element (41) of the engagement structure (16) is provided at the end of the radial wall portion opposite to the valve opening (22).

10. The check valve according to claim 9, characterized in that, A through-hole (46) is provided in the radial wall portion of the valve housing (14), and extends and elongates in the circumferential direction, connecting the valve seat (23) of the valve housing (14) surrounding the valve opening (22) to a connecting member (47) of the connecting elements (41, 42) which extends between the through-holes (46).

11. The check valve according to claim 1, wherein, A guiding portion (29) is provided on the valve closing member (25), which extends into the main housing (12) and is guided longitudinally movably in the main housing (12).

12. The check valve according to claim 11, characterized in that, A return element (33) is provided between the valve closing member (25) and the main housing (12) in a preloaded manner.

13. The check valve according to claim 1, characterized in that, The valve closing member (25) includes at least one guiding fin (51) opposite to the closing surface (26), which extends parallel to the longitudinal axis (64) of the valve housing (14). The guiding fin (51) includes an end face (52) pointing in the radially outward direction, and the axial length of the end face is greater than the width of the through-hole (46) in the radial wall portion.

14. The check valve according to claim 1, characterized in that, The valve seat (23) of the valve housing (14) includes a support surface (61), on which the valve closing member (25) is supported in its closed position (54). The valve seat (23) of the valve housing (14) further includes a sealing surface (62), against which a sealing element (27) of the valve closing member (25) abuts. Wherein, the support surface (61) and the sealing surface (62) are formed separately relative to each other.

15. The check valve according to claim 14, characterized in that, The support surface (61) and the sealing surface (62) are adjacent to each other.

16. The check valve according to claim 14, wherein, The support surface (61) is oriented at an angle α of 10° to 90° with respect to the longitudinal axis (64) of the valve housing (14).

17. The check valve according to claim 16, characterized in that, The sealing surface (62) is oriented at an angle β of 90° or less than 90° with respect to the longitudinal axis (64).

18. The check valve according to claim 14, wherein By means of the axial distance between the sealing surface (62) and the support surface (61) on the valve seat (23), the contact pressure of the sealing element (27) of the closing member (25) in the closed position (54) of the valve can be adjusted.

19. The check valve according to claim 14, wherein, The sealing element (27) is mounted on the valve closing member (25), clamped to the valve closing member (25), vulcanized on the valve closing member (25) and / or bonded to the valve closing member (25).

20. The check valve according to claim 1, characterized in that, The valve housing (14) and / or the valve closing member (25) is made of plastic material, and the main housing (12) is made of plastic material or metal material.

21. The check valve according to claim 20, characterized in that, The main housing (12) is made of light metal material.

22. A connecting device for a check valve (11) according to any one of claims 1-21, - comprising a connection point (76), through which the check valve (11) can be inserted into the connection point (76) from the outside through a connection opening (77) of the connection point (76), - comprising a base body (73) in which a supply channel including a supply opening (72) is provided, the supply channel leading to a connection point (76) in the base body (73), - including an outlet opening (74) which connects the connection point (76) to an outlet channel, - including a first insertion part (78) in the connection point (76), the first insertion part (78) being arranged between the supply opening (72) and the outlet opening (74), the valve housing (14) being locatable in the first insertion part (78), and - including a second insertion portion (79) in the connection point (76), the second insertion portion (79) being disposed between the supply opening (72) and the outlet opening (74), and the main housing (12) of the check valve (11) being fixed in the second insertion portion (79), wherein, the main housing (12) is fixed in a second insertion part (79) in the axial direction to the connection point (76) by means of a detachable fastening element (82), the valve housing (14) being located in the first insertion part (78) of the connection point (76) so as to be axially movable.

23. The connecting device according to claim 22, characterized in that, The check valve (11) is fixed in the second insertion part (79) by means of a detachable fastening element (82), the main housing (12) being supported in the second insertion part (79) on a shoulder (81) of the second insertion part (79) by a stop surface (37), the detachable fastening element (82) acting on a mounting part (38) of the main housing (12) opposite the stop surface (37), the main housing (12) being fixed in the second insertion part (79).

24. The connecting device according to claim 22, characterized in that, Sealing elements (36) acting in the radial direction are provided between the main housing (12) and the second insertion part (79) and between the valve housing (14) and the first insertion part (78).

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