Slide valve having annular connection for minimizing flow resistance in region of continuously adjustable orifice

Abstract

The invention relates to a slide valve (10) in which a control slide body (40) is received in a housing (20) in a linearly displaceable manner with respect to a longitudinal axis (11), the control slide body (40) together with the housing (20) forming a continuously adjustable first opening (81). According to the invention, the first opening (81) is associated with an annular connection (43), the outer diameter (45) of which is smaller than the diameter (47) of the first outer peripheral surface (41) controlling the sealing of the sliding body (40), the annular connection (43) being arranged along the longitudinal axis (11) in such a way that, when the annular connection (43) lies within the second housing recess (32) with respect to the longitudinal axis (11), the annular connection (43) is connected to the second housing recess (32). Flow resistance along the first fluid flow path is minimal.

Description

Technical Field

[0001] The invention relates to a slide valve according to the preamble of claim 1 . Background Art

[0002] A slide valve is known from EP 3 042 087 B1, in which a control slide is received in a housing in a manner that can be linearly moved about a longitudinal axis. The control slide forms a first orifice together with the housing, and the free cross-sectional area of ​​the first orifice can be continuously adjusted by moving the control slide. The opening characteristics of the first orifice are defined by a first precision-controlled cutout on the control slide. A narrow annular connection is provided on the control slide adjacent to the first orifice. Contrary to the present invention, this annular connection is not used to minimize the flow resistance of the orifice that is opened to the maximum extent. Instead, it is used to maintain a load, in order to prevent the actuator connected to the slide valve from moving against the desired direction of motion due to an external load. Accordingly, the annular connection seals against the sliding hole where the control slide is received. Summary of the invention

[0003] The invention has the advantage that the flow resistance of the maximally open, continuously adjustable orifice is less than the flow resistance of a comparable or equivalently sized conventional slide valve. This flow resistance determines the maximum possible fluid flow that can be achieved with the slide valve. The flow resistance is usually minimized by increasing the diameter of the slide bore so that the maximum free cross-sectional area of ​​the continuously adjustable orifice can be increased. With the invention, such a material-intensive enlargement of the slide bore can be omitted, with only relatively minor changes being made to the control slide. The invention also has the advantage that the torque exerted on the control slide by the fluid flow due to friction is minimized.

[0004] According to claim 1, the outer diameter of the annular connection is smaller than the diameter of the first outer peripheral surface of the control slide, wherein the annular connection is arranged along the longitudinal axis such that the flow resistance along the first fluid flow path is minimal when the annular connection is located within the second housing recess with respect to the longitudinal axis. When the flow resistance is minimal, the first opening is preferably maximally open. The annular connection is preferably designed rotationally symmetrically with respect to the longitudinal axis, wherein the annular connection in particular does not have fine control cutouts or the like. The slide valve is preferably used with a pressure fluid, wherein the pressure fluid is most preferably a liquid and in particular a hydraulic oil.

[0005] Advantageous developments and refinements of the invention are specified in the dependent claims.

[0006] It can be provided that the annular connection has a second outer circumferential surface that is cylindrically configured with respect to the longitudinal axis. The second outer circumferential surface can thus be manufactured precisely with little effort. The position and size of the second outer circumferential surface can be adjusted very precisely, which decisively influences the minimization of the flow resistance according to the invention.

[0007] It can be provided that the annular connection has a third side wall and a fourth side wall pointing away from each other, wherein the third side wall faces the first side wall, wherein the fourth side wall faces the second side wall, wherein the transition from the third side wall to the bottom wall and / or the transition from the fourth side wall to the bottom wall is designed in a rounded manner. The rounding is preferably designed in such a way that no eddies are generated in the fluid flow at the corresponding corners. The largest possible volume should be available for a eddy-free flow, since the flow resistance is usually minimal in this way. Preferably, all rounded transitions are rounded with the same radius.

[0008] It can be provided that the transition from the first side wall to the bottom wall and / or the transition from the second side wall to the bottom wall is designed in a rounded manner, wherein preferably all rounded transitions are rounded with the same radius. The rounding is therefore provided not only on the annular connection but also preferably at all corners in the bottom wall region.

[0009] It can be provided that the third side wall transitions sharply into the second outer peripheral surface at an angle of 40° to 50°, so that the width of the annular connection increases from the second outer peripheral surface toward the bottom wall. The third side wall thus guides the flow along the first fluid flow path in a manner with little eddy flow. Thus, the flow resistance is low when the first opening is opened to the greatest extent.

[0010] It can be provided that the fourth side wall transitions sharply into the second outer peripheral surface at an angle of 80° to 100°. The angle is preferably 90°. The fourth side wall forms together with the second side wall a recess in the control slide, through which the fluid flow can be uniformly spread over the entire periphery of the control slide, thereby minimizing local overspeed in the fluid flow. The above-mentioned design solution achieves the largest possible volume of this recess, so that the above-mentioned effect is particularly pronounced.

[0011] It can be provided that the diameter of the second outer circumferential surface is between 60% and 85% of the diameter of the first outer circumferential surface. With this design, it can be achieved that the flow resistance along the first fluid flow path is particularly low when the first opening is opened to the maximum.

[0012] It can be provided that the width of the annular connection in the second peripheral surface area is between 10% and 25%, preferably 15%, of the width of the second housing recess in the sliding hole area. With the proposed design, the swirl around the control slide is effectively minimized. Therefore, the control slide does not rotate around the longitudinal axis. Such rotation can lead to significant wear at the sliding hole, the control slide and / or the cover at the end of the sliding hole. This wear can be so severe that the slide valve completely fails. In addition, the proposed measures also minimize the flow resistance when the first orifice is opened to the maximum, because the minimization of the swirl also leads to the minimization of the pressure loss.

[0013] It can be provided that the sliding body recess comprises a second sliding body recess, wherein the second sliding body recess is arranged on one side of the first side wall directly adjacent to the first sliding body recess, wherein the distance between the first sliding body recess and the second sliding body recess is designed to be so small that the first sliding body recess and the second sliding body recess can be connected to the first housing recess for fluid exchange at the same time, wherein the width of the second sliding body recess is between 15% and 30% of the diameter of the first outer peripheral surface. Therefore, the second sliding body recess is arranged directly adjacent to the first orifice downstream. When the first orifice is opened to the maximum, it is located in the area of ​​the first housing recess, wherein the first orifice contributes to the fluid flow being able to be evenly distributed over the entire circumference of the control sliding body in the first housing recess. Therefore, there is basically no local overspeed that increases the flow resistance. The use of the second housing recess also minimizes the torque applied to the control sliding body by the fluid flow due to friction.

[0014] It can be provided that the housing recess comprises a third housing recess which can interact with the second side wall in such a way that a second, continuously adjustable opening is produced, wherein, depending on the position of the control slide, either the first opening or the second opening is open. In the region of the second side wall, a plurality of second fine control cutouts are preferably arranged on the first outer circumference, which are components of the second opening. As will be explained below, the second opening is advantageous if the control slide can be adjusted from a central position in two opposite directions in order to achieve a second fluid flow path and a third fluid flow path which is different therefrom.

[0015] It can be provided that the sliding body recess comprises a third sliding body recess, wherein the third sliding body recess is arranged on one side of the second side wall directly adjacent to the first sliding body recess, wherein the distance between the first sliding body recess and the third sliding body recess is designed to be so small that the first sliding body recess and the third sliding body recess can be connected to the third housing recess for fluid exchange at the same time, wherein the width of the third sliding body recess is between 20% and 40%, preferably 32%, of the diameter of the first outer peripheral surface. The flow resistance in the region of the second orifice is minimized by means of the third sliding body recess when the second orifice is opened to the maximum. That is to say, space for flow is provided, which makes the fluid flow, especially in the third housing recess, spread substantially evenly over the circumference of the control sliding body, wherein local overspeed is avoided.

[0016] It can be provided that the housing recess comprises a fourth housing recess and a fifth housing recess, wherein the fourth housing recess is constructed mirror-symmetrically with the second housing recess about the first symmetry plane, wherein the fifth housing recess is constructed mirror-symmetrically with the third housing recess about the first symmetry plane, wherein the sliding body recess comprises a fourth sliding body recess, a fifth sliding body recess and a sixth sliding body recess, wherein the fourth sliding body recess is constructed mirror-symmetrically with the first sliding body recess about the second symmetry plane, wherein the fifth sliding body recess is constructed mirror-symmetrically with the second sliding body recess about the second symmetry plane, wherein the sixth sliding body recess is constructed mirror-symmetrically with the third sliding body recess about the second symmetry plane, so that a third opening and a fourth opening are generated, wherein the third opening is assigned to the first opening according to the aforementioned mirror-symmetrical structure, wherein the fourth opening is assigned to the second opening according to the aforementioned mirror-symmetrical structure. The first symmetry plane and / or the second symmetry plane are preferably oriented perpendicular to the longitudinal axis. Depending on the position of the control sliding body, the first symmetry plane and the second symmetry plane can coincide. Preferably, the first symmetry plane and the second symmetry plane coincide in the middle position of the control slide, which is preloaded by means of at least one spring. In the middle position, the first opening and the third opening are preferably completely closed. With this symmetrical design of the slide valve, two adjustment regions of the control slide can be provided, namely to the left and to the right of the middle position, wherein, apart from the flow direction, the slide valve has the same operating characteristics in both cases.

[0017] It can be provided that the second fluid flow path starts from the second housing recess, via the first sliding body recess, further via the first opening, further via the first housing recess, further via the fifth housing recess, further via the fourth opening, further via the fourth sliding body recess to the fourth housing recess, wherein the third fluid flow path starts from the fourth housing recess, further via the third opening, further via the first housing recess, further via the third housing recess, further via the second opening, further via the first sliding body recess to the second housing recess. The second fluid flow path and the third fluid flow path differ primarily in the direction of flow between the second housing recess and the fourth housing recess. Due to the mirror-symmetrical structure described above, similar conditions exist for the fluid flow in the second fluid flow path and the third fluid flow path, so that the operating characteristics do not differ except for the flow direction.

[0018] Depending on the position of the control slide, either the second fluid flow path is opened or the third fluid flow path is opened, wherein the other third fluid flow path or the second fluid flow path is blocked. The second fluid flow path overlaps with the first fluid flow path in sections. In the second fluid flow path and the third fluid flow path, a common pressure balance is preferably arranged downstream of the first housing recess, which pressure balance is most preferably constructed according to US 5 305 789A. The entire content of US 5 305 789 A is cited and used as the content of the present application. Preferably, the second housing recess and the fourth housing recess are permanently connected to the first interface or the second interface of the corresponding assignment, wherein the first interface and the second interface are arranged on the opposite flat sides of the valve disc.

[0019] It goes without saying that the features mentioned above and the features still to be explained below can be used not only in the respectively specified combination but also in other combinations or alone, without departing from the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is described in detail below with reference to the accompanying drawings.

[0021] Figure 1 shows a longitudinal section of a slide valve according to the present invention;

[0022] Figure 2 Shows Figure 1 A partial enlarged view in the area of ​​the annular connection;

[0023] Figure 3 Shows Figure 1 A stereoscopic view of the control slide in FIG. 1 ; and

[0024] Figure 4 Shown according to Figure 1A three-dimensional cross-sectional view of the shell. DETAILED DESCRIPTION

[0025] Figure 1 The longitudinal section of the slide valve 10 according to the invention is shown. The slide valve 10 comprises a housing 20 in which a control slide 40 is received linearly displaceably with respect to a longitudinal axis 11. The housing 20 is preferably constructed as a casting, wherein it is made of grey cast iron or aluminium. The sliding bore 21, which is cylindrical with respect to the longitudinal axis 11, is manufactured by high-precision machining. It is interrupted by a plurality of housing recesses 30, namely by a fifth housing recess 35, a fourth housing recess 34, a first housing recess 31, a second housing recess 32 and a third housing recess 33, which are arranged distributed along the longitudinal axis 11 in a specified order. The housing recesses 30 are respectively arranged around the longitudinal axis 11 in the form of annular grooves, wherein they preferably have a constant cross-sectional shape over the entire circumference.

[0026] The third and fifth housing recesses 33, 35 are constructed in a mirror-symmetrical manner with respect to a first plane of symmetry, which is oriented perpendicular to the longitudinal axis 11. The second and fourth housing recesses 32, 34 are also constructed in a mirror-symmetrical manner with respect to the first plane of symmetry. The first housing recess 31 is arranged in the region of the first plane of symmetry and is itself constructed in a mirror-symmetrical manner with respect to the first plane of symmetry. The housing recesses 30 are each constructed in such a way that they each have a sharp edge at the transition to the sliding hole 21, which edge surrounds the longitudinal axis in a circular shape. The cast housing blank is reworked in the region of the first, second, third and fourth openings 81, 82, 83, 84 by cutting, so that the mentioned edges are particularly precisely defined. Figure 1 In FIG. 1 , reference numerals 81 , 82 , 83 , 84 are shown on the contour of the corresponding opening arranged at the housing 20 , ie on the edge at the housing 20 , which edge is usually referred to as the control edge. Figure 3 In FIG. 4 , the mentioned reference numerals are shown on the contour of the corresponding openings arranged at the control slide 40 .

[0027] The present sliding valve 10 is constructed in the form of a valve disk, which is to be mounted approximately in the middle of the valve body so that it divides the valve body into two halves, which can each be supplied with pressure fluid by a separate pump. One pump is connected to the second housing recess 32, wherein the other pump is connected to the fourth housing recess 34. In the middle position of the control slide 40, the first and third openings 81, 83 are closed in a fluid-tight manner, in particular, so that no fluid exchange occurs between the two halves of the valve body. When the control slide 40 moves out of its middle position, the pressure fluid can flow from the higher-pressure half of the valve body to the lower-pressure half of the valve body. In Figure 1In the position of the control slide 40 shown, which is moved to the left from the middle position, the first and fourth openings 81, 84 are open. This results in a second fluid flow path, which leads from the second housing recess 32 via the first opening 81, further via the receiving opening 22 in the housing 20, further via the fifth housing recess 35, further via the fourth opening 84 to the fourth housing recess 34. A pressure balance known from US Pat. No. 5,305,789 A is preferably installed in the receiving opening 22, by means of which the higher pressure level at the second housing recess 32 is reduced to the lower pressure level at the fourth housing recess 34.

[0028] If the sliding body is controlled to Figure 1 Moving to the right from the middle position in the opposite way, the second and third orifices 82, 83 are opened. The corresponding third fluid flow path extends from the fourth housing recess 34 via the third orifice 83, further via the receiving hole 22, further via the second orifice 82 to the second housing recess 32. The higher pressure level at the fourth housing recess 34 is preferably reduced to the lower pressure level at the second housing recess 32 by means of the mentioned pressure balance.

[0029] The invention relates in particular to the annular connection 43 on the first orifice 81, which is also present in a mirrored manner on the third orifice 83. In particular, this annular connection 43 can be used in any slide valve comprising a continuously adjustable orifice.

[0030] It should also be noted that the two tank passages 23 in the housing 20 exist mainly to obtain continuous tank passages on the valve body mentioned above, which are not blocked by the current valve disc or the current slide valve 10. In the current slide valve 20, the tank passages 23 can also be used to discharge internal leakage.

[0031] Figure 2 Shows Figure 1 Detailed enlargement in the area of ​​the annular connection 43. The position of the control slide 21 shown corresponds to the position at which the first fluid flow path has the minimum flow resistance. Here, the first fluid flow path is part of the second fluid flow path, which extends between the second housing recess 32 and the first housing recess 31. The mentioned flow resistance is primarily determined by the free cross-sectional area of ​​the first opening 81. In the present case, this first opening is opened as large as possible, wherein the portion 41a of the first outer peripheral surface 41 of the control slide 21, which is arranged between the first and third slide recesses 51, 53, just rests against the slide bore 21 in a sealing manner.

[0032] The control sliding body 40 has a first outer peripheral surface 41 which is cylindrical with respect to the longitudinal axis 11 and is sealingly matched with the sliding hole 21. The first outer peripheral surface 41 is interrupted by a plurality of sliding body recesses 50 distributed along the longitudinal axis 11, in particular by a first sliding body recess 51 and a third sliding body recess 53. The annular connecting portion 43 according to the present invention is arranged in the first sliding body recess 51, which is preferably constructed in a rotationally symmetrical manner with respect to the longitudinal axis 11. The annular connecting portion is arranged in such a way that it divides the pressure fluid flowing corresponding to the arrow 12 into two halves. Here, the flow profile in the left area of ​​the annular connecting portion 43 ( ) roughly corresponds to the flow profile in a conventional slide valve without an annular connection. However, a significantly changed flow profile is generated on the right side of the annular connection 43, because there the fluid flow is deflected in a direction that partially extends opposite to the main flow direction, which is directed along the first fluid flow path. On the one hand, this allows the inflowing pressure fluid 12 to be better distributed over the entire circumference of the control slide 40. As a result, there are fewer areas with local flow velocities that are significantly increased compared to the average flow velocity. As a result, the flow resistance along the first fluid flow path has been significantly reduced. The design of the annular connection explained below further reduces the flow resistance along the first fluid flow path.

[0033] It should be noted here that, at a cursory glance, a similar annular connection is known from EP 3 042 087 B1. In contrast to EP 3 042 087 B1, in the present invention the annular connection 43 has a second outer circumferential surface 42, the diameter 45 of which is significantly smaller than the diameter 47 of the sliding bore 21 or the first outer circumferential surface 41. The annular connection 43 therefore does not have a sealing effect in any position of the control slide 40, since it never contacts the sliding bore 21. The annular connection 43 therefore acts when the opening cross section of the first opening 81 is at its maximum, wherein in all other positions of the control slide 40, the annular connection has only a negligible effect on the flow resistance along the first fluid flow path compared to the effect of the reduced first opening 81.

[0034] Furthermore, the relative position of the annular connection portion 43 with respect to the first aperture is different from that in EP 3 042 087 B1. In the present invention, the annular connection portion 43 is located approximately in the center of the second housing recess 32 with respect to the longitudinal axis 11 when the first aperture 81 has the largest opening cross section.

[0035] The first sliding body recess 51 has a first side wall and a second side wall 61, 62, which are substantially flat and oriented perpendicular to the longitudinal axis 11. The bottom wall 44 of the first sliding body recess 51 is cylindrically configured with respect to the longitudinal axis 11 at a distance from the annular connection 43. In the current control slide 40, the bottom walls 44 of all sliding body recesses 50 have approximately the same diameter 46. It is conceivable that the diameters of different bottom walls 44 are designed slightly differently in order to further minimize the flow resistance. The first side wall 61 is the side wall of the first precision control cutout 71 in which the first orifice 81 is arranged. With the first precision control cutout 71, the change (Verlauf) of the opening cross section of the first orifice 81 is defined by the adjustment stroke of the control slide 21. The edge of the housing 20 assigned to the first orifice 81 extends in a circular ring around the longitudinal axis 11.

[0036] The annular connection 43 has a third side wall and a fourth side wall 63, 64, which point away from each other. Here, the third side wall 63 points toward the first side wall 61. It is designed as a cone, wherein in the present case it transitions to the cylindrical second outer peripheral surface 42 at an angle of 45° at a sharp edge. Here, the inclination direction is selected so that the annular connection 43 has a minimum width 73 in the region of its second outer peripheral surface 42. The inclination of the third side wall 63 is used to guide the fluid flow with little resistance. In contrast, the fourth side wall 64 is flat in the region of the second outer peripheral surface 42 and is constructed perpendicular to the longitudinal axis 11, so that there is a free space as large as possible that can accommodate the fluid flow.

[0037] The first, second, third and fourth side walls 61, 62, 63, 64 transition into the respectively associated bottom wall 44 in the form of a rounding 74. In the present case, the respective radius of the rounding 74 is designed to be identical in all four cases, although it can also be designed differently with minimal flow resistance. It should be noted that the rounding 74 on the first side wall 61 is Figure 3 In Figure 2 can be seen better in Figure 2 The cross section is in a position that is difficult to see clearly.

[0038] In addition, Figure 2 6 , the second and third sliding body recesses 52, 53 can be seen, which are arranged on opposite sides of the first sliding body recess 51 with respect to the longitudinal axis 11, wherein the second sliding body recess 52 is arranged on one side of the first side wall 61. The second and third sliding body recesses 52, 53 are each designed as an annular groove, which surrounds the longitudinal axis 11 with a constant rectangular cross-sectional shape, wherein the corners in the region of the groove bottom are rounded again.

[0039] Here, the second sliding body recess 52 minimizes the flow resistance of the first maximally opened orifice 81 by creating space for the flow downstream of the first finely controlled cutouts 71. As a result, the flow profiles are substantially the same at all first finely controlled cutouts 71, wherein no flow velocity occurs at any first finely controlled cutout 71 that is significantly higher than the flow velocity at other first finely controlled cutouts 71.

[0040] The function of the third sliding body recess 53 is similar, wherein here the flow resistance of the second opening 82 which is opened to the greatest extent should be minimized. Figure 1 , the maximum opening state of the fourth opening 84 is shown, which is designed in a mirror-image manner with respect to the second opening 82 , wherein the flow resistance of the fourth opening 84 is minimized in a similar manner by the sixth sliding body recess 56 .

[0041] Figure 3 Shows Figure 1 3D view of the control slide 40 in FIG. In particular, the mirror-symmetrical structure of the control slide 40 can be seen, which enables the second fluid flow path and the third fluid flow path to exhibit essentially identical operating characteristics. The mirror-symmetrical structure is based on a second symmetry plane oriented perpendicularly to the longitudinal axis 11. In a central position of the control slide 40, the second symmetry plane coincides with the first symmetry plane, which is the basis for the mirror-symmetrical structure of the housing.

[0042] The second sliding body recess and the fifth sliding body recess 52, 55 are constructed in mirror symmetry with respect to the second symmetry plane. The first and third orifices 81, 83 together with the corresponding first precision cutouts 71 are constructed in mirror symmetry with respect to the second symmetry plane. The first sliding body recess and the fourth sliding body recess 51, 54 together with the annular connecting portion 43 are constructed in mirror symmetry with respect to the second symmetry plane. The second orifice and the fourth orifice 82, 84 together with the second precision cutout 72 are constructed in mirror symmetry with respect to the second symmetry plane. The third sliding body recess and the sixth sliding body recess 53, 56 are constructed in mirror symmetry with respect to the second symmetry plane.

[0043] Figure 4 Shown according to Figure 1 3D sectional view of the housing 20. In particular, the mirror-symmetrical structure of the housing 20 similar to the control slide can be seen. The corresponding first symmetry plane is arranged in the region of the first housing recess 31, wherein the first housing recess 31 is designed mirror-symmetrically with respect to the first symmetry plane. The second housing recess 32, 34 and the fourth housing recess 33, 35 are designed mirror-symmetrically with respect to the first symmetry plane.

[0044] List of reference numerals:

[0045] 10 Slide valve

[0046] 11 Longitudinal axis

[0047] 12 Inflow of pressure fluid

[0048] 20 Shell

[0049] 21 Sliding holes

[0050] 22 receiving holes

[0051] 23 Tank channel

[0052] 30 shell recess

[0053] 31 first housing recess

[0054] 32 second housing recess

[0055] 33 third housing recess

[0056] 34 fourth housing recess

[0057] 35 fifth housing recess

[0058] 36 Width of the second housing recess

[0059] 40 Control slide

[0060] 41 first outer peripheral surface

[0061] 41a The portion of the first outer peripheral surface between the first sliding body recess and the third sliding body recess

[0062] 42 second outer peripheral surface

[0063] 43 Ringsteg

[0064] 44 bottom wall

[0065] 45 The outer diameter of the annular connecting portion or the diameter of the second outer peripheral surface

[0066] 46 Bottom wall diameter

[0067] 47 Diameter of the first outer peripheral surface

[0068] 50 Sliding body recess

[0069] 51 first sliding body recess

[0070] 52 second sliding body recess

[0071] 53 third sliding body recess

[0072] 54 fourth sliding body recess

[0073] 55 fifth sliding body recess

[0074] 56 Sixth sliding body recess

[0075] 61 first side wall

[0076] 62 second side wall

[0077] 63 Third side wall

[0078] 64 Fourth side wall

[0079] 71 First precision incision (Feinsteuerkerbe)

[0080] 72 Second precision incision

[0081] 73 Minimum width of the annular connection

[0082] 74 rounded transition part

[0083] 75 Angle between the third side wall and the second outer peripheral surface

[0084] 76 The width of the second sliding body recess

[0085] 77 Width of the third sliding body recess

[0086] 81 First orifice (Blende)

[0087] 82 Second orifice

[0088] 83 Third Orifice

[0089] 84 Fourth Orifice

Claims

1. A slide valve (10) having a housing (20) in which a control slide (40) is received so as to be linearly movable about a longitudinal axis (11), wherein: The housing (20) has a cylindrical sliding hole (21) about the longitudinal axis (11), and the sliding hole is divided by at least two housing recesses (30) annularly surrounding the longitudinal axis (11), wherein the housing recesses (30) are distributed along the longitudinal axis (11), wherein the control sliding body (40) has a cylindrical first outer peripheral surface (41) about the longitudinal axis (11), and the first outer peripheral surface is adapted to the sliding hole (21) in a sealing manner, wherein the first outer peripheral surface (41) is surrounded by the longitudinal axis (11). The invention relates to a method for separating a first sliding body recess (51) from a second sliding body recess (51) by at least two sliding body recesses (50) annularly surrounding an axis (11), wherein the sliding body recesses (50) are distributed along the longitudinal axis (11), wherein the sliding body recesses (50) include a first sliding body recess (51), wherein the first sliding body recess (51) has a first side wall and a second side wall (61; 62) and a bottom wall (44), wherein a plurality of first precision-controlled cutouts (71) are distributed on the periphery of a first outer peripheral surface (41) in the region of the first side wall (61), wherein: The housing recess (30) comprises a first housing recess and a second housing recess (31; 32), wherein the first housing recess (31) and the first precision cutout (71) cooperate in such a way as to generate a first orifice (81) that can be adjusted continuously, wherein the second housing recess (32) is arranged relative to the first housing recess (31) in such a way that a first fluid flow path can be adjusted, the first fluid flow path from the second housing recess (32) via the first sliding body recess (51), further via the first orifice (81) extends to the first housing recess (31), wherein an annular connecting portion (43) extending annularly about the longitudinal axis (11) is arranged on the bottom wall (44) of the first sliding body recess (51), wherein the outer diameter (45) of the annular connecting portion (43) is greater than the diameter (46) of the associated bottom wall (44), wherein the minimum width (73) of the annular connecting portion (43) in the direction of the longitudinal axis (11) is smaller than the width (36) of the second housing recess (32) in the region of the sliding hole (21), It is characterized in that the outer diameter (45) of the annular connecting portion (43) is smaller than the diameter (47) of the first outer peripheral surface (41), wherein the annular connecting portion (43) is arranged along the longitudinal axis (11) such that when the annular connecting portion (43) is located within the second shell recess (32) with respect to the longitudinal axis (11), the flow resistance along the first fluid flow path is minimized.

2. The slide valve (10) according to claim 1, in, The annular connection (43) has a second outer circumferential surface (42) which is cylindrical in shape relative to the longitudinal axis (11).

3. Sliding valve (10) according to any one of the preceding claims, in, The annular connecting portion (43) has a third side wall and a fourth side wall (63; 64) pointing away from each other, wherein the third side wall (63) faces the first side wall (61), wherein the fourth side wall (64) faces the second side wall (62), wherein the transition from the third side wall (63) to the bottom wall (44) and / or the transition from the fourth side wall (64) to the bottom wall (44) is constructed in a rounded manner (74).

4. The slide valve (10) according to claim 3, in, The transition from the first side wall (61) to the bottom wall (44) and / or the transition from the second side wall (62) to the bottom wall (44) is designed in a rounded manner (74), wherein preferably all rounded transitions (74) are rounded with the same radius.

5. The slide valve (10) according to claim 3 or 4, referring back to claim 2, in, The third side wall (63) transitions sharply into the second outer peripheral surface (42) at an angle (75) of 40° to 50°, so that the width of the annular connection (43) increases from the second outer peripheral surface (42) toward the bottom wall (44).

6. The slide valve (10) according to any one of claims 3 to 5, returning to claim 2, in, The fourth side wall (64) merges sharply into the second outer circumferential surface (42) at an edge angle of 80° to 100°.

7. The slide valve (10) according to any one of claims 2 to 6, in, The diameter (45) of the second outer peripheral surface (42) is between 60% and 85% of the diameter (47) of the first outer peripheral surface (41).

8. The slide valve (10) according to any one of claims 2 to 7, in, The width (73) of the annular connection (43) in the region of the second outer circumferential surface (42) is between 10% and 25% of the width (36) of the second housing recess (32) in the region of the sliding hole (21).

9. Sliding valve (10) according to any one of the preceding claims, in, The sliding body recess (50) includes a second sliding body recess (52), wherein the second sliding body recess (52) is arranged on the side of the first side wall (61) directly adjacent to the first sliding body recess (51), wherein the distance between the first sliding body recess and the second sliding body recess (51; 52) is designed to be so small that the first sliding body recess and the second sliding body recess (51; 52) can be simultaneously connected to the first housing recess (31) for fluid exchange, wherein the width (76) of the second sliding body recess (52) is between 15% and 30% of the diameter (47) of the first outer peripheral surface (41).

10. Sliding valve (10) according to any one of the preceding claims, in, The housing recess (30) comprises a third housing recess (33) which can interact with the second side wall (62) in such a way that a second opening (82) which can be continuously adjusted is produced, wherein, depending on the position of the control slide (40), the first opening or the second opening (81; 82) is opened.

11. The slide valve (10) according to claim 10, in, The sliding body recess (50) includes a third sliding body recess (53), wherein the third sliding body recess (53) is arranged on the side of the second side wall (62) directly adjacent to the first sliding body recess (51), wherein the distance between the first sliding body recess and the third sliding body recess (51; 53) is designed to be so small that the first sliding body recess and the third sliding body recess (51; 53) can be simultaneously connected to the third shell recess (33) for fluid exchange, wherein the width (77) of the third sliding body recess (53) is between 20% and 40% of the diameter (47) of the first outer peripheral surface (41).

12. The slide valve (10) according to claim 11, in, The shell recess (30) includes a fourth shell recess and a fifth shell recess (34; 35), wherein the fourth shell recess (34) is constructed in a mirror-symmetrical manner with the second shell recess (32) about a first symmetry plane, wherein the fifth shell recess (35) is constructed in a mirror-symmetrical manner with the third shell recess (33) about the first symmetry plane, wherein the sliding body recess (50) includes a fourth sliding body recess, a fifth sliding body recess and a sixth sliding body recess (54; 55; 56), wherein the fourth sliding body recess (54) is constructed in a mirror-symmetrical manner with the first sliding body recess (51) about the first symmetry plane. The two symmetry planes are constructed in a mirror-symmetrical manner, wherein the fifth sliding body recess (55) is constructed in a mirror-symmetrical manner with the second sliding body recess (52) with respect to the second symmetry plane, wherein the sixth sliding body recess (56) is constructed in a mirror-symmetrical manner with the third sliding body recess (53) with respect to the second symmetry plane, thereby producing a third orifice and a fourth orifice (83; 84), wherein the third orifice (83) is assigned to the first orifice (81) according to the aforementioned mirror-symmetrical structure, and wherein the fourth orifice (84) is assigned to the second orifice (82) according to the aforementioned mirror-symmetrical structure.

13. The slide valve (10) according to claim 12, in, The second fluid flow path starts from the second housing recess (32), passes through the first sliding body recess (51), further passes through the first orifice (81), further passes through the first housing recess (31), further passes through the fifth housing recess (35), further passes through the fourth orifice (84), and further passes through the fourth sliding body recess (54) to the fourth housing recess (34), wherein the third fluid flow path starts from the fourth housing recess (34), passes through the third orifice (81), further passes through the first housing recess (31), further passes through the third housing recess (33), further passes through the second orifice (82), and further passes through the first sliding body recess (51) to the second housing recess (82).

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