Valve arrangement for a multi-way valve

Abstract

The invention relates to a valve arrangement for a multi-way valve, comprising a connection point (16) in which an inlet (12) and at least a first and a second outlet (14, 15) are provided, which are connected to one another, wherein a first passage is formed at least between the inlet (12) and the first outlet (14) and a second passage is formed between the inlet (12) and the second outlet (15), comprising a valve body (37), the lifting movement of which along a lifting axis in the connection point (16) can be controlled by an actuating element (34) of a drive (27), wherein the valve body (37) is tubular, and the valve body (37) can be arranged in a first end position (39), in which the first passage is closed, and in a second end position (41), in which the second passage is closed, by means of the lifting movement, wherein the valve body (37) is provided with at least one seal (58),which is arranged between the first and second end positions, is guided displaceably.,

Description

[0001] The invention relates to a valve arrangement for controlling a medium, in particular in a refrigerant circuit of a refrigeration system with a heat pump function.

[0002] DE 10 2017 102 841 A1 discloses a multi-way valve for controlling a refrigerant circuit of a refrigeration system with heat pump function. This multi-way valve comprises a housing with an inlet connected to a control chamber in the housing via a fluid channel. Furthermore, the housing comprises a first and a second outlet opening, which are also connected to the control chamber. A rotary slide valve arrangement is provided in the control chamber, which comprises a first control disc and a second control disc. At least the first control disc of the rotary slide valve arrangement is actuated by a drive, so that the first and / or the second outlet opening can be controlled selectively. The control discs of the rotary slide valve arrangement are made of a wear-resistant and low-friction material, such as ceramic. The requirements for a simple design and lower actuating forces, as well as a reduction in installation volume, are constantly increasing.

[0003] The invention is based on the object of proposing a valve arrangement for controlling a medium, in particular in a refrigerant circuit of a refrigeration system with a heat pump function, which has a simple structure and in which a valve body can be actuated with low actuating forces.

[0004] This object is achieved by a valve arrangement for a multi-way valve, in which a first passage is formed between the inlet and the first outlet and a second passage is formed between the inlet and the second outlet, wherein a valve body is tubular and closes the first outlet in a first end position of a lifting movement and closes the second outlet in a second end position, wherein the valve body is guided displaceably between the two end positions by at least one seal during the lifting movement. This arrangement enables a structurally simple design in which the valve body can be moved between the two end positions by a lifting movement, in particular along the lifting axis. This can enable simple control of a refrigerant from the inlet to the first or second outlet.

[0005] Preferably, the tubular valve body comprises a first valve closing element, which opens and closes a first passage between the inlet and the first outlet, and a second valve closing element, which opens and closes a second passage between the inlet and the second outlet. Thus, the opening and closing of the first or second passage can be selectively controlled by a lifting movement of the valve body. The two valve closing elements are preferably formed on the tubular valve body, so that a refrigerant can only escape in the axial direction and not in the radial direction between the two valve closing elements.

[0006] According to a further preferred embodiment of the valve arrangement, it can be provided that the valve body, when moving between the first and second end positions, can be transferred into an intermediate position in which the inlet and the two outlets are connected to one another. This arrangement allows the refrigerant to flow from the inlet into both the first and second outlets. In the intermediate position, the volume flow can also be controlled such that, for example, a higher volume flow is transferred to one outlet than to the other.

[0007] The tubular valve body preferably has a cylindrical section that is slidably received by the seal. A dynamic seal is preferably provided. This allows for a structurally simple design of the valve body.

[0008] Preferably, the cylindrical portion of the valve body has a length such that the valve body is guided by the seal during the stroke movement between the first and second end positions. Consequently, the length of the cylindrical portion can be adapted to the structural conditions while still maintaining a simple seal design, preferably between the first and second passages.

[0009] The valve body advantageously has a valve closing element at each end of the cylindrical section. Thus, through the lifting movement, one valve closing element can open a passage and the other, in particular opposite, valve closing element can simultaneously close a passage. The valve closing elements are preferably designed to be mirror-symmetrical to the cylindrical section of the valve body.

[0010] Preferably, a first valve seat is formed in the first passage between the inlet and the first outlet, and a second valve seat is formed in the second passage between the inlet and the second outlet. This allows the valve body to alternately close one or the other passage by positioning the respective valve closure member in the valve seat.

[0011] The valve closure member preferably has a conical closing body that tapers or widens toward the end face of the tubular valve body. In both cases, the previously described end positions can be controlled to control the refrigerant.

[0012] According to a first embodiment, a tapered, conical closing body is provided at the respective end face of the valve body. The closing body is preferably formed integrally with the cylindrical portion of the valve body. According to a second embodiment, a widening, conical closing body can be provided at the respective end face of the valve body. In this embodiment, the valve body is formed in at least two parts, with a separation point preferably being formed in a central cylindrical portion of the valve body.

[0013] In particular, it is provided that the valve closure elements are designed with the same geometry. This allows the same gradient of the characteristic curve for the flow volume to be achieved for both valve closure elements. This allows the same opening and closing conditions, in particular the forces acting due to the pressure of the refrigerant in the refrigerant circuit, to prevail both when the valve body is positioned in the first end position and in the second end position. This embodiment also has the advantage that the drive does not need to be designed differently for the respective opening and closing movement of the respective valve closure element.

[0014] A valve seat with a radial sealing surface is provided in each of the first and second passages. This radial sealing surface advantageously interacts with the conical closing body of the valve closure element, in particular to achieve a tight seat seal.

[0015] The inner diameter of the seal engaging the cylindrical portion of the valve body and the inner diameter of the sealing surface of the valve seat are preferably identical. This ensures equal force ratios during the opening and closing movement of the valve body.

[0016] It can also be provided that, in the case of valve closing elements that taper towards the end faces of the valve body, the inner diameter of the sealing surface of the valve closing element is smaller than the inner diameter of the seal. In particular, it is provided that the diameter of the sealing surface of the valve seat comprises at least 95%, in particular at least 99%, of the inner diameter of the seal. This ensures that only a small gap is created between the conical valve closing element and the radial sealing surface of the valve seat during a lifting movement of the valve body from a closed position. The smaller the annular gap, the lower the force that must be applied for a lifting movement of the valve body in order to move it from a closed position to an open position.

[0017] It is also provided that in the case of valve closing elements which widen towards the end faces of the valve body, an inner diameter of the radial sealing surface of the valve seat is designed to be larger than an inner diameter of the seal, in particular the inner diameter of the radial sealing surface comprises at most 105%, in particular less than 101% of the diameter of the seal.

[0018] Advantageously, at least the conical closing body and the sealing surface of the valve seat are made of metal. In particular, the entire valve body is made of metal. This design has the advantage that a high degree of seat tightness can be achieved between the closing body and the sealing surface, while simultaneously providing a clamping effect between the closing body of the valve closure member and the sealing surface of the valve seat. As a result, no additional components are required to maintain the conical closing body in a tight arrangement with the sealing surface of the valve seat.

[0019] A further preferred embodiment of the valve assembly provides that the first and second valve seats can be inserted into the passage of the connection point, and the seal is arranged between the first and second valve seats. This allows for simple construction and installation of the seal as a dynamic ring seal and completes the valve assembly.

[0020] Preferably, the first and second valve seats are formed separately from one another, and the seal for guiding the valve body is positioned and received at a connection point between the first and second valve seats. This enables easy installation of the seal between the two valve seats.

[0021] The invention, as well as further advantageous embodiments and developments thereof, are described and explained in more detail below with reference to the examples shown in the drawings. The features shown in the description and the drawings can be used individually or in any combination according to the invention. They show: Fig. 1 a schematic sectional view of a first embodiment of a valve arrangement with a valve body in a first end position, Fig. 2 a schematic sectional view of the embodiment according to Fig. 1 with the valve body in a second end position, Fig. 3 a schematic sectional view of the embodiment according to Fig. 1 with the valve body in an intermediate position, Fig. 4 a schematically enlarged view of the valve body of the valve arrangement according to Fig. 1, Fig. 5 a schematic sectional view of a second embodiment of a valve arrangement with a valve body in a first end position, Fig. 6 a schematic sectional view of the second embodiment according to Fig. 5 with the valve body in a second end position, Fig. 7 a schematic sectional view of the second embodiment according to Fig. 5 with the valve body in an intermediate position, Fig. 8 a schematically enlarged view of the valve body of the valve arrangement according to Fig. 5, and Fig. 9 a schematically enlarged detailed view of an alternative embodiment of the valve body.

[0022] In Fig. Figure 1 shows a schematic sectional view of a multi-way valve 11. This multi-way valve 11 can be used to control a refrigerant circuit of a refrigeration system with a heat pump function. This multi-way valve 11 is designed, for example, as a three-way valve comprising an inlet 12 and a first outlet 14, as well as a second outlet 15. Alternatively, the multi-way valve 11 can also have multiple inlets and / or outlets.

[0023] The multi-way valve 11 is shown by way of example in an installed position in a connection point 16. This connection point 16 comprises an insertion opening 17 into which the multi-way valve 11 can be inserted and connected to the connection point 16, in particular fastened with a detachable screw connection. An inlet opening 21 and a first and second outlet opening 22, 23 are provided in the connection point 16. The inlet opening 21 and the first and second outlet openings 22, 23 open into the insertion opening 17. This insertion opening 17 can also form a regulating chamber that connects the inlet 12 and the first outlet 14 and the second outlet 15 to one another.

[0024] The multi-way valve 11 comprises a valve housing 25. This valve housing 25 is connected to a drive 27. The drive 27 is designed as an electrically controllable drive 27. A connection 28 is provided for this purpose. This connection 28 can serve to supply energy and / or transmit data to electronics (not shown in detail) in the drive 27. The drive 27 is designed, for example, as a separating cap motor. It is preferably provided that the electronics of the drive 27 enable precise control of a lifting movement of a valve body 37. This control can be stepwise or continuous. This makes it possible for the valve body 37 to be controlled and assumed in a defined lifting position. This drive 27 comprises a stationary stator 31 and a rotatably drivable rotor 32. A separating cap 33 is arranged between the stator 31 and the rotor 32.The separating cap 33 is arranged in a media-tight manner to the connection point 16 or to the insertion opening 17. The rotor 32 drives a rotary actuator 34. The actuator 34 has a thread 35 on its outer circumference. The actuator 34 is secured in its position axially to the rotor 32 and rotates about its longitudinal axis. Alternatively, a proportional magnetic drive, in particular with a magnetic armature position control, or other electrically controllable drives can be provided.

[0025] The actuating element 34 extends through the valve housing 25. In particular, this actuating element 34 is positioned in a valve body chamber 36. The actuating element 34 is connected to a valve body 37. The actuating element 34 or the drive 27 imparts a lifting movement to the valve body 37 along its longitudinal axis. The valve body 37 can be moved by the drive 27 from a first end position 39, which is, for example, in Fig. 1, into a second end position 41, which is in Fig. 2. In addition, the drive 27 enables the valve body 37 to be moved into one or more intermediate positions 42, wherein an intermediate position 42 is shown, for example, in Fig. 3 is shown.

[0026] The valve body 37 is secured against rotation relative to the actuating element 34 by an anti-rotation device 44. The anti-rotation device 44 is movable within the valve body chamber 36. For example, a flattened portion or a spring guided in a groove of the valve body chamber 36, or the like, is provided on the outer circumference of the anti-rotation device 44.

[0027] A pressure bypass 46 is provided between the valve body 37 and the valve body chamber 36. This pressure bypass 46 is formed between the thread 35 of the actuating element 34 and the anti-rotation device 44, for example, as a flattened portion on the actuating element 34. The pressure bypass 46 can also be formed between the anti-rotation device 44 and the valve body chamber 36.

[0028] The valve body 37 is tubular. The valve body 37 can be made of a plastic. The valve body 37 can also be made of a light metal alloy and other materials suitable for use with various refrigerants. An end section of the valve body 37 is connected to the actuating element 34 or the anti-rotation device 44. The valve body 37 has two through-openings 48, 49. In the exemplary embodiment, a first through-opening 48 is provided at the front end of the tubular valve body 37. The further or second through-opening 49 is provided opposite. The second through-opening 49 is formed, for example, by a cage 50, which has, for example, a plurality of individual openings 76, which are separated in particular by webs.Depending on the stroke position of the valve body 37, the actuating element 34 can extend within the cage 50 provided at the end of the valve body 37. The through-openings 48, 49 can be circular, for example. They can also be polygonal or rectangular. A combination of the two is also possible, for example, in the cage 50.

[0029] The valve body 37 has a first valve closing member 63. The second valve closing member 53 is provided at its end facing the drive 27. This second valve closing member 53 is in the shape of a cone or taper that tapers towards the cage 50 or the drive 27. A first valve closing member 63 is formed opposite this second valve closing member 53. This first valve closing member 63 is also in the shape of a cone or taper that tapers towards the passage opening 48 or towards the inlet 12. Between the second valve closing member 53 and the first valve closing member 63, the valve body 37 has a cylindrical section 54. The second valve closing member 53, the cylindrical section 54, and the first valve closing member 63 are preferably formed as a single piece.Within the second valve closing member 53, the cylindrical portion 54 and the first valve closing member 63, a passage extends from the first passage opening 48 to the second passage opening 49.

[0030] Surrounding the valve body 37 and adjacent to the valve housing 25 is a sleeve having a first and a second valve chamber sleeve 66, 51. These two valve chamber sleeves 51, 66 are connected to one another, for example, by a plug-in connection, which can be inserted and positioned in the insertion opening 17 of the connection point 16. For the sealing arrangement of the valve chamber sleeves 51, 66, at least one seal 65 is provided on an outer circumference of each of the first valve chamber sleeve 66 and the second valve chamber sleeve 51. The first and second valve chamber sleeves 66, 51 are preferably tubular. The first valve chamber sleeve 66 surrounds the first valve closing member 63. The second valve chamber sleeve 51 surrounds at least the second valve closing member 53 and can surround a region of the cylindrical portion 54. The second valve chamber sleeve 51 is preferably detachably attached to the valve housing 25.In addition, a seal can be provided in between. A second valve seat 52 is formed on an inner circumference of the second valve chamber sleeve 51. This second valve seat 52 and the second valve closing member 53 form a second valve 55, which is opened or closed depending on the stroke movement of the valve body 37.

[0031] The first valve chamber sleeve 66 is positioned in the insertion opening 17 in association with the inlet 12. A first valve seat 62 is formed on an inner circumference of the first valve chamber sleeve 66, which surrounds the first valve closure member 63.

[0032] A seal 58 is positioned between the first valve chamber sleeve 66 and the second valve chamber sleeve 51. This seal 58 is held in place by the plug-in or screw connection between the first valve chamber sleeve 51 and the second valve chamber sleeve 51. This seal 58 surrounds the cylindrical portion 54 of the valve body 37 and bears against it in a sealing manner. The cylindrical portion 54 of the valve body 37 is guided axially displaceably by the seal 58.

[0033] The upper and lower valve seats 52, 62 are preferably identical, and in particular with respect to an axis of symmetry which may extend through the seal 58.

[0034] The first valve chamber sleeve 66 has a first passage opening 72 between the first valve seat 64 and the seal 58, which leads into a first pressure chamber 57 that communicates with the first outlet 14. Similarly, a second passage opening 71 is provided between the second valve seat 52 and the seal 58, which opens into the second pressure chamber 56, which communicates with the second outlet 15.

[0035] In this embodiment, the valve body 37 is formed in one piece and a two-part sleeve is formed consisting of the first valve chamber sleeve 66 and the second valve chamber sleeve 51 to enable assembly, so that a first valve 64 and a second valve 55 are formed on the valve body 37 together with the sleeve.

[0036] In Fig. In Figure 1, the valve body 37 of the multi-way valve 11 is shown in the first end position 39 at the connection point 16 and thus in a first switching position. In this first switching position, the first valve 64 is closed and the second valve 55 is open. Consequently, the inlet 12 communicates with the first passage opening 48 and the second passage opening 49, as well as the second pressure chamber 56, so that the refrigerant is transferred from the inlet 12 to the second outlet 15.

[0037] Due to this arrangement of the multi-way valve 11 according to Fig. 1 also allows the pressure of the medium present at the inlet 12 to be applied via the pressure bypass 46 in the valve body chamber 36. Based on this, a reduced actuating force of the drive 27 is required to move the valve body 37 from a first end position 39 according to Fig. 1 into the second end position 41 according to Fig. 2 to be transferred.

[0038] In Fig. 2, the valve body 37 is shown in the second end position 41. The first valve 64 is open and the second valve 55 is closed. In this second switching position, the inlet 12 is consequently connected to the first passage opening 48 and the first pressure chamber 57, so that the refrigerant is transferred from the inlet 12 to the first outlet 14. The refrigerant present in the valve body 37 up to the actuator 27, which exits through the cage 50, does not reach the second passage opening 71 and the second pressure chamber 56 because the second valve 55 is closed. This flow path is blocked. Furthermore, the refrigerant cannot flow outside the valve body 37 from the inlet 12 toward the second outlet 15, since the seal 58 forms a sealing contact against the cylindrical portion 54 of the valve body 37.

[0039] In Fig. 3, the valve body 37 is arranged in an intermediate position 42. In this intermediate position 42, both the first valve 64 and the second valve 55 are open. This enables the refrigerant to be transferred from the inlet 12 with a first partial flow into the first outlet 14 and with a second partial flow into the second outlet 15. If the valve body 37 is moved closer towards the first end position 39, but the first valve 64 is not yet closed, the volume of the first partial flow to the first outlet 14 is smaller than that of the second partial flow to the second outlet 15. The same applies if the valve body 37 is moved closer towards the 2nd end position 41. Thus, depending on the stroke movement of the valve body 37 between the 1st end position 39 and the 2nd end position 41, a volume of the 1st partial flow and the 2nd partial flow can be controlled.

[0040] In Fig. 4 shows a schematic enlarged view of the first valve 64. The second valve 55 is constructed in a similar manner, so that the explanations for Fig. 4 also apply to the second valve 55. The first valve seat 62 is formed on a cylindrical inner circumference of the first valve chamber sleeve 66. The first valve closing member 63 is formed on a front end of the valve body 37, which is assigned to the first passage opening 48. The first valve closing member 63 has a profile which tapers from the cylindrical section 54 to the free end. The valve closing member 63 can have a conical profile, wherein the cone has a constant gradient, i.e. runs in a straight line. Alternatively, a parabolic profile of the curvature of the valve closing member 63 can also be provided, in particular so that the characteristic curve of the curvature comprises a profile of a quadratic function. The valve closing member 63 can also have two or more conical sections arranged in a row with increasing angles starting from the cylindrical section 54.

[0041] In particular, it is provided that, when the valve 64 is closed, the first valve closing element 63 is positioned in the first valve seat 62 with a slight clamping effect. This enables internal (seat) tightness. Furthermore, an additional spring for the necessary closing force can be omitted. In particular, it is provided that both the valve body 37 and the valve chamber sleeve 66 are made of metal.

[0042] In the Fig. 5 to 8 is an alternative embodiment of the multi-way valve 11 to the Fig. 1 to 4. In this embodiment according to the Fig. 5 to 8, the first and second valves 55, 64 are different from the first embodiment according to the Fig. 1 to 4. In this respect, only the deviations are described below. Otherwise, reference is made to the explanations on the Fig. 1 to 4 are referred to.

[0043] In the valve body 37, it is provided that the respective first and second valve closing members 63, 53 arranged at the end section of the valve body 37 widen, i.e., do not taper. The first valve closing member 63 thus widens toward the first passage opening 48 with respect to the outer circumference. The second valve closing member 53 widens toward the second passage opening 49, as seen on the outer circumference. The first and second valve closing members 63, 53 preferably have the same cone or conical shape as in the embodiment according to Fig. 4. In particular, the cone of the first and second valve closing members 63, 53 is of identical design.

[0044] The cylindrical section 54 is again formed on the valve body 37 between the first and second valve closing members 63, 53. In this embodiment, however, the valve body 37 is advantageously formed in two parts. It can also be formed in multiple parts. Preferably, the at least one separation point 74 is formed in the region of the cylindrical section 54 of the valve body 37. This can be a plug-in connection, a press connection, a screw connection, or the like.

[0045] The valve seat 52, 62 is adapted in such a way that it is designed in the form of an annular collar that protrudes inward, i.e., radially inward, relative to an inner diameter of the first valve chamber sleeve 66 and the second valve chamber sleeve 51. A valve seat surface is designed as a radially circumferential cylindrical section and is aligned with the outer circumference of the valve body 37.

[0046] Both the first embodiment and the second embodiment comprise a valve body 37, which each comprises two valve closing members 53, 63, which are separated from one another by the cylindrical section 54 and are preferably formed symmetrically to a center plane of the cylindrical section 54.

[0047] In Fig. 9 shows a schematically enlarged alternative embodiment of the valve body 37. This alternative embodiment in Fig. 9 differs from the embodiments in the Fig. 1 to 3 in that instead of a cage 50 for forming the second passage opening 49, radially aligned individual openings 76 are formed. These individual openings 76 are preferably located in a common plane perpendicular to the longitudinal axis of the valve body 37. These individual openings 76 are preferably circular and can be separated from one another, for example, by webs. Due to this arrangement of the radial individual openings 76, a large flow cross-section is provided, allowing the exchange of the flow medium between the interior of the valve body 37 and the exterior of the valve body 37. In all other respects, the statements regarding the Fig. 1 to 4 in analogy also for the valve body 37 according to Fig. 9. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2017 102 841 A1

[0002]

Claims

[1] Valve arrangement for a multi-way valve, - with a connection point (16) in which an inlet (12) and at least a first and a second outlet (14, 15) are provided, which are connected to one another, - wherein a first passage is formed at least between the inlet (12) and the first outlet (14) and a second passage is formed between the inlet (12) and the second outlet (15), - with a valve body (37), the stroke movement of which along a stroke axis in the connection point (16) can be controlled by an actuating element (34) of a drive (27), characterized by , - that the valve body (37) is tubular, and - that the valve body (37) can be arranged in a first end position (39), in which the first passage is closed, and in a second end position (41), in which the second passage is closed, by the lifting movement, wherein the valve body (37) is displaceably guided by at least one seal (58) which is arranged between the first and second end positions. [2] Valve arrangement according to claim 1, characterized by that the tubular valve body (37) has a first valve closing member (63) which opens and closes a first valve (64), and a second valve closing member (53) which opens and closes a second valve (55). [3] Valve arrangement according to claim 1 or 2, characterized bythat the valve body (37) closes the first outlet (14) in the first end position (39) by means of the first valve (64) and releases the second outlet (15) by means of the second valve (55) and in the second end position (41) closes the second outlet (15) and releases the first outlet (14). [4] Valve arrangement according to one of the preceding claims, characterized by that the valve body (37) can be moved into an intermediate position between the first end position (39) and the second end position (41), in which the inlet (12) is connected to the first and second outlet. [5] Valve arrangement according to one of the preceding claims, characterized byin that the tubular valve body (37) has a cylindrical portion (54) which is slidably received by the seal (58), and preferably the cylindrical portion (54) of the valve body (37) has a length such that the valve body is slidably guided by the seal between the first and second end positions (39, 41). [6] Valve arrangement according to claim 5, characterized by that the first valve closing member (63) is formed at one end of the cylindrical portion (54) of the valve body (37) and the second valve closing member (53) is formed at the opposite end of the cylindrical portion (54). [7] Valve arrangement according to one of the preceding claims, characterized by that a first valve (64) is formed in the first passage between the inlet (12) and the first outlet (14) and a second valve (55) is formed in the second passage between the inlet (12) and the second outlet (15). [8] Valve arrangement according to one of claims 2 to 7, characterized by that the at least one valve closing member (63, 53) has a conical closing body which tapers or widens towards the end face of the tubular valve body (37). [9] Valve arrangement according to claim 8, characterized by that the valve body (37) with the tapered valve closing members (63, 53) is formed in one piece, or that the valve body with the widening valve closing members (63, 53) is formed in two parts or in several parts, wherein at least one separation point (74) is preferably formed in the region of the cylindrical section (54) of the valve body (37). [10] Valve arrangement according to claim 8 or 9, characterized bythat the opposing valve closing members (63, 53) are mirror-inverted to the cylindrical portion (54) of the valve body (37) and preferably symmetrical to a center plane of the valve body (37). [11] Valve arrangement according to one of claims 6 to 10, characterized by that the valve seat (62, 52) of the first and second valve (64, 55) has a radial sealing surface. [12] Valve arrangement according to claim 11, characterized by that an inner diameter of the seal (58) and an inner diameter of the radial sealing surface of the valve seat (62, 52) are the same or almost the same. [13] Valve arrangement according to claim 11 or 12, characterized byin that, in the case of a valve closing member (63, 53) which tapers towards the end faces of the valve body (37), an inner diameter of the radial sealing surface of the valve seat (62, 52) is smaller than an inner diameter of the seal (58), in particular the inner diameter of the radial sealing surface comprises at least 95 percent, in particular more than 99 percent of the diameter of the seal (58), or in the case of a valve closing member (63, 53) which widens towards the end faces of the valve body (37), an inner diameter of the radial sealing surface of the valve seat (62, 52) is larger than an inner diameter of the seal (58), in particular the inner diameter of the radial sealing surface comprises at most 105%, in particular less than 101% of the diameter of the seal (58). [14] Valve arrangement according to one of claims 7 to 13, characterized bythat at least the valve closing member (63, 53) and the radial sealing surface of the valve seat (62, 52) are made of metal. [15] Valve arrangement according to one of the preceding claims, characterized by that the first valve seat (62) is arranged in a first valve chamber sleeve (66) and the second valve seat (52) is arranged in a second valve chamber sleeve (51). [16] Valve arrangement according to claim 15, characterized by that at least one seal (58) resting against the valve body (37) is positioned between the first and second valve chamber sleeves (66, 51).

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