Abstract:
The invention relates to a screw-in valve comprising a screw-in component, a sleeve with at least two connection openings to which a pressure load can be alternately applied, and a valve piston held for axial displacement in the sleeve for opening and closing a flow connection between the connection openings. In order to further develop the screw-in valve so as to reduce the risk of impairing movement of the valve piston on account of misalignment of the screw-in component, it is proposed, in accordance with the invention, that the sleeve be mounted so as to be axially immovable but displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component relative to the screw-in component.

Description:
This application is a continuation of international application number PCT/EP02/06418 filed on Jun. 12, 2002. 
   The present disclosure relates to the subject matter disclosed in international application PCT/EP02/06418 of Jun. 12, 2002, which is incorporated herein by reference in its entirety and for all purposes. 

   BACKGROUND OF THE INVENTION 
   The invention relates to a screw-in valve comprising a screw-in component, a sleeve with at least two connection openings to which a pressure load can be alternately applied, and a valve piston held for axial displacement in the sleeve for opening and closing a flow connection between the connection openings. 
   Such screw-in valves are known in various configurations, for example, in the form of directional control valves, check valves or overload valves. The valves can be controlled by hand or by an external force, for example, by means of an electromagnet. 
   The screw-in valve can be screwed by means of a screw-in component into a housing, for example, a control block, and by axial displacement of the valve piston, i.e., in the longitudinal direction of the sleeve, a flow connection can be selectively opened or closed between two connection openings of the sleeve for a pressure fluid, for example, a hydraulic fluid or compressed air. The axially movable piston is guided in the sleeve with very little play in order to keep leakage of the screw-in valve as low as possible. It has been found that movability of the piston may be impaired by a misalignment of the screw-in component occurring when screwing it into the housing accommodating the screw-in valve. Such a misalignment or canting of the screw-in component cannot always be excluded, as such screw-in valves are often screwed in within a short time under rough ambient conditions by people who are untrained. 
   The object of the present invention is to further develop a screw-in valve of the kind mentioned at the outset in such a way that the danger of impairing the movement of the valve piston when screwing in the screw-in component is reduced. 
   SUMMARY OF THE INVENTION 
   This object is accomplished, in accordance with the invention, with a screw-in valve of the generic kind in that the sleeve is mounted so as to be axially immovable but displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component relative to the screw-in component. 
   The invention incorporates the concept that an impairment of the movement of the valve piston in the event of misalignment or canting of the screw-in component can be reduced by the sleeve being mounted so as to be displaceable and/or pivotable perpendicularly to the screw-in direction. Thus, if the screw-in component is canted when being screwed into a corresponding housing, the resulting misalignment of the screw-in component can be compensated by a kind of “countermovement” of the sleeve, namely a tilting, pivoting or displacement perpendicular to its longitudinal axis, i.e., by means of radial tolerance compensation. 
   The invention also embodies the concept that by means of axially immovable mounting of the sleeve it can be ensured that during use of the screw-in valve it is not necessary for the sleeve, in the screwed-in state of the screw-in valve, to be supported on a support surface of the housing accommodating the screw-in valve. Rather, such a support surface can be dispensed with, but the capability of the sleeve to be alternately subjected to pressure load, i.e., the capability of the sleeve to be subjected to axial pressure load in both the direction towards the screw-in component and the direction away from the screw-in component, is maintained. This generally enables a considerably simplified assembly of the screw-in valve, for even in the event of a misalignment or a canting of the screw-in component, the movability of the valve piston is not impaired. Furthermore, there is no need to ensure that the screw-in component is screwed far enough into a housing accommodating the screw-in valve that the sleeve comes to rest against a corresponding support surface of the housing and is therefore supported in axial direction. Consequently, assembly of the screw-in valve can even be carried out by untrained personnel under time pressure. 
   In a preferred embodiment of the inventive screw-in valve, the sleeve is connected to the screw-in component by at least one positive connection. It has been found that a mounting of the sleeve which can be alternately subjected to pressure load can be cost-effectively ensured by means of a positive connection, with the sleeve being displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component. Consequently, the sleeve can carry out a tilting, wobbling or displacement without its axial position relative to the screw-in component undergoing any change. 
   It is preferable for the sleeve to be directly positively connected to the screw-in component. 
   For example, provision may be made for the sleeve to be connected to the screw-in component by means of a flange. In this case, a flange is to be understood as a deformation of the screw-in component and/or of the sleeve transversely to the longitudinal axis of the sleeve, i.e., a widening or narrowing, with a positive connection between sleeve and screw-in component being achieved by the deformation. 
   Alternatively and/or supplementarily, provision may be made for the sleeve to be positively connected to the screw-in component by means of a retaining ring or snap ring connection. For example, provision may be made for the screw-in component to form a receptacle in which a section of the sleeve is held with play by means of a retaining ring or a snap ring. By making sure that there is play between the section of the sleeve and the receptacle of the screw-in component, it can be ensured in a constructionally simple manner that the sleeve can be displaced and/or pivoted perpendicularly to the screw-in direction of the screw-in component. By means of the retaining ring or snap ring it is, at the same time, ensured that the sleeve which is capable of being subjected to pressure load in two opposed directions can be axially immovably mounted on the screw-in component. 
   It is of advantage for the sleeve to be connected to the screw-in component by at least one intermediate component. In many cases, assembly of the screw-in valve can thereby be simplified. 
   For example, provision may be made for the sleeve to be secured on the intermediate component, and for the intermediate component to be positively connected to the screw-in component and to be mounted so as to be axially immovable but displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component relative to the screw-in component. 
   The sleeve can be secured to the intermediate component by, for example, the sleeve being screwed to the intermediate component. 
   In a preferred embodiment of the invention, the intermediate component is connected to the screw-in component by means of a flange. For this purpose, provision may, for example, be made for the intermediate component to dip into a receptacle of the screw-in component, and for the screw-in component to be deformed at the level of the receptacle, after introduction of the intermediate component, transversely to the direction of introduction, and for a positive connection to thereby be made between screw-in component and intermediate component. Alternatively and/or supplementarily, provision may be made for an end section of the intermediate component dipping into the receptacle of the screw-in component to be radially outwardly deformed and to thereby dip into a receiving groove of the screw-in component receiving the widened area of the end section. By means of the flange it is ensured that the intermediate component can be displaced and/or pivoted perpendicularly to the screw-in direction of the screw-in component, so that in the event of canting of the screw-in component, a compensatory movement of the intermediate component and the sleeve secured thereto is possible, so as to prevent impairment of the movement of the valve piston. 
   As explained above, the inventive screw-in valve is characterized, inter alia, by the sleeve being mounted so as to be axially immovable relative to the screw-in component. Such a mounting can be ensured in a constructionally particularly simple manner by the sleeve being releasably connectable, for example, screwable, to the intermediate component, and by the screw-in component forming a stop on which the intermediate component is axially immovably held. 
   In a particularly preferred embodiment of the inventive screw-in valve, the sleeve is held on the intermediate component so as to be axially immovable but displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component, and the intermediate component is held on the screw-in component so as to be axially immovable but displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component. In the event of canting of the screw-in component, this makes it possible to compensate its misalignment both by a pivoting or displacement of the intermediate component relative to the screw-in component and by a pivoting or displacement of the sleeve relative to the intermediate component. Thus, only comparatively small relative movements between sleeve and intermediate component and between intermediate component and screw-in component are required to ensure that in the event of misalignment of the screw-in component, impairment of the movement of the valve piston is prevented. 
   It is expedient for the intermediate component to comprise an axial bore in which an end area of the sleeve is held with radial play by means of a snap ring or a retaining ring. The end area of the sleeve is alignable at an incline to the longitudinal axis of the axial bore of the intermediate component as the end area of the sleeve is received with radial play by the axial bore. The snap ring or retaining ring ensures that movement of the sleeve in axial direction, i.e., in the longitudinal direction of the sleeve, is prevented. 
   As explained above, the screw-in valve can be manually operable or by external force. 
   Provision is made in a preferred embodiment for the screw-in valve to be electromagnetically actuatable. For this purpose, the screw-in valve preferably comprises an electromagnetic actuating unit with an electromagnet surrounding a pole tube, with the pole tube forming the above-explained intermediate component which is connected to the sleeve. In such an embodiment, the sleeve is held on the pole tube, and the pole tube is mechanically connected to the screw-in component. 
   Provision may be made for the pole tube to be integrally joined to the screw-in component. This enables an embodiment of the inventive screw-in valve, which can be manufactured particularly cost-effectively. 
   Alternatively, provision may be made for the pole tube to be releasably connectable, for example, screwable, to the screw-in component. 
   For the electromagnetic actuation, the screw-in valve preferably comprises an electromagnetic actuating unit which is displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component. 
   Impairment of the actuation of the screw-in valve in the event of the screw-in component canting or becoming jammed or misaligned in any other way can thereby be prevented. For example, provision may be made for the electromagnetic actuating unit to comprise a pole tube on which an electromagnet is held, with the pole tube being positively connected to the screw-in component and displaceable and/or pivotable at an incline or perpendicularly to the screw-in direction of the screw-in component. The pole tube usually receives a magnet armature which, upon excitation of the electromagnet, is movable in axial direction to actuate the valve piston. The pole tube forms a guide for the magnet armature, in which the magnet armature is slidingly mounted. In the event of the screw-in component canting or getting stuck, the pole tube can be displaced and/or pivoted perpendicularly to the screw-in direction, so that the movement of the magnet armature guided in the pole tube is not impaired by a canting or any other misalignment of the screw-in component. 
   The following description of preferred embodiments serves in conjunction with the drawings to explain the invention in greater detail. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows a sectional view of a first embodiment of an inventive screw-in valve; 
       FIG. 2  shows a side view in the direction of arrow A from  FIG. 1 ; 
       FIG. 3  shows a sectional view of a second embodiment of an inventive screw-in valve; 
       FIG. 4  shows a sectional view of a third embodiment of an inventive screw-in valve; 
       FIG. 5  shows a sectional view of a fourth embodiment of an inventive screw-in valve; 
       FIG. 6  shows a sectional view of a fifth embodiment of an inventive screw-in valve; 
       FIG. 7  shows a sectional view of a sixth embodiment of an inventive screw-in valve; 
       FIG. 8  shows a sectional view of a seventh embodiment of an inventive screw-in valve; 
       FIG. 9  shows a sectional view of an eighth embodiment of an inventive screw-in valve; 
       FIG. 10  shows a sectional view of a ninth embodiment of an inventive screw-in valve; 
       FIG. 11  shows a sectional view of a tenth embodiment of an inventive screw-in valve; and 
       FIG. 12  shows a sectional view of an eleventh embodiment of an inventive screw-in valve. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
     FIGS. 1 and 2  show in schematic representation a first embodiment of an inventive screw-in valve which is generally designated by reference numeral  11 . It is constructed as a 3/2-port directional control valve and comprises a sleeve  13  with a longitudinal bore  15  oriented coaxially with the longitudinal axis  14  of the sleeve  13  and with two parallel transverse bores  16  and  17  arranged in spaced relationship to each other with respect to the longitudinal axis  14 . The longitudinal bore  15  defines at the end face a first connection opening  18  of the sleeve  13 , and the transverse bores  16  and  17  define in the circumferential area of the sleeve  13  second and third connection openings. 
   A valve piston  20  is held for axial displacement, i.e., in the direction of the longitudinal axis  14 , in the longitudinal bore  15  of the sleeve  13 . The valve piston  20  is guided inside the longitudinal bore  15  by means of two guide seals  21  and  22  arranged in axially spaced relationship to each other, which are fitted into the longitudinal bore  15  and each comprise a sealing ring which bears in a fluid-tight manner on the wall of the longitudinal bore  15 . Between the outer side of the valve piston  20  and the wall of the longitudinal bore  15  there are three ring-shaped spaces in the form of a front flow space  23  in the area between the first guide seal  21  and the front end of the valve piston  20  facing the first connection opening  18 , a rear flow space  24  at a level between the two guide seals  21  and  22 , and a spring space  25  between the second guide seal  22  and the rear end of the valve piston  20  facing away from the first connection opening  18 . 
   The valve piston  20  comprises in coaxial alignment with the longitudinal axis  14  a blind bore  26  which opens into the front end face of the valve piston  20  facing the first connection opening  18  of the sleeve  13 . From the end area of the blind bore  26  facing away from the first connection opening  18  there branches off a transverse bore  27 , so that the first connection opening  18  is in pressure connection with the spring space  25  via the blind bore  26  and the transverse bore  27 . 
   The screw-in valve  11  can be screwed into a housing, which is known per se and, therefore, not shown in the drawings, for example, into the housing of an hydraulic control block. For this purpose, the screw-in valve  11  comprises a screw-in component  30  with a stepped through-bore  31  comprising a front bore section  32  facing the first connection opening  18  of the sleeve  13  and a rear bore section  33  facing away from the first connection opening  18 , which are connected to each other via a radially extending step  34 . The screw-in component  30  carries at the level of the front bore section  32  an external thread  35 , and at the level of the rear bore section  33  the screw-in component  30  is configured on the outside as a hexagon  36 . 
   The screw-in valve  11  is electromagnetically actuatable. An electromagnetic actuating unit  40  with an electromagnet  41 , which surrounds a pole tube  42  in circumferential direction, is used therefor. The pole tube  42  accommodates a magnet armature  43 , which is held in a cylindrical receptacle  44  of the pole tube  42  for displacement parallel to the longitudinal axis  14  of the sleeve  13  and is displaceable in the direction towards the valve piston  20  by excitation of the electromagnet. 
   Secured to the magnet armature  43  is a tappet  45  which passes through a through-bore  46  of the pole tube  42  and bears with its free end on the rear end face of the valve piston  20  facing away from the connection opening  18 . 
   The valve piston  20  is surrounded in the area of the spring space  25  by a helical return spring  48  which is clamped between a support disc  49  and a support body  50 . The support disc  49  is supported in axial direction on a radial widening of the longitudinal bore  15 , and the support body  50  is held immovably in axial direction on the valve piston  20  by means of a retaining ring  51 . 
   When the electromagnet  41  is excited, the magnet armature  43  is displaced and thereby exerts an actuating force on the valve piston  20  via the tappet  45 , so that the valve piston  20  is displaced against the return force of the return spring  48  from its rear position shown in  FIG. 1  so far forwards that the first guide seal  21  in the area between the first connection opening  18  and the front transverse bore  16  lies tight against the wall of the longitudinal bore  15 . This results in the flow connection between the first connection opening  18  and the front transverse bore  16  via the front flow space  23  being closed, while, at the same time, the flow connection between the front transverse bore  16  and the rear transverse bore  17  via the rear flow space  24  is opened. When the electromagnet  41  is not excited, the magnet armature  43  no longer exerts any actuating force, and the valve piston  20  is returned to its rear position shown in  FIG. 1  under the action of the return spring  48 , with the first guide seal  21  closing the flow connection between the two transverse bores  16  and  17  and instead opening the flow connection between the first connection opening  18  and the front transverse bore  16 . 
   To ensure that the displacement of the valve piston  20  is not impaired by the screw-in component  30  canting or becoming jammed or misaligned in any other way when being screwed into an associated housing, the sleeve  13 , in which the valve piston  20  is guided, is mounted such that it is displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component  30 , but is held immovably in axial direction in relation to the screw-in component  30 . For this purpose, in the first embodiment of the invention shown in  FIGS. 1 and 2  the sleeve  13  passes through the screw-in component  30  and dips with its rear end facing away from the first connection opening  18  into a receptacle  54  of the pole tube  42  and is screwed in this area to the pole tube  42  via a thread  55 . The pole tube  42 , in turn, forms at the level of the thread  55  a pole tube sleeve  56  which dips so far into the rear bore section  33  of the through-bore  31  of the screw-in component  30  that a clearance, for example, a spacing of approximately 0.1 mm results between the step  34  and the end face  57  of the pole tube sleeve  56  facing the connection opening  18 . 
   At the level of the rear bore section  33  the pole tube sleeve  56  is positively connected via a flange to the screw-in component  30 . For this purpose, the screw-in component  30  is bent radially inwardly in the area of the hexagon  36 , as indicated by arrows  59  in  FIG. 2 . After the bending, the screw-in component  30  engages at the level of the hexagon  36  a ring groove  60  which surrounds the pole tube sleeve  56  in circumferential direction. With a view to improved clarity, the screw-in valve  11  is shown in  FIG. 1  in the state prior to producing the flange. 
   By way of the flange of the screw-in component  30  it is ensured that the screw-in component  30  is positively connected to the pole tube  42  which, in turn, is screwed to the sleeve  13 . The flange connection makes it possible to align the pole tube  42  at an incline to the screw-in component  30 , i.e., to pivot it about a pivot axis aligned perpendicularly to the screw-in direction. The sleeve  13  screwed to the pole tube  42  passes through the front bore section  32  of the screw-in component  30  with radial play, so that the sleeve  13  can be aligned together with the pole tube  42  at an incline to the screw-in component  30 , i.e., a wobbling or pivoting movement can occur to compensate a misalignment of the screw-in component  30 , and owing to the screw connection between pole tube  42  and sleeve  13  it is ensured that the sleeve  13  is unable to carry out any axial movement even under alternating pressure load. 
   Alternative embodiments of the inventive screw-in valve are shown in  FIGS. 3 to 12 , and identical components or components which act in the same way bear the same reference numerals as in  FIG. 1 . In this regard, in order to avoid repetitions, reference is made in full to the above explanations. 
     FIG. 3  shows a screw-in valve in the form of a 3/2-port directional control valve, generally designated by reference numeral  70 , which differs from the above-explained screw-in valve  11  in that the sleeve  13  is not screwed to the pole tube  42 , but instead a snap ring connection is provided between the sleeve  13  and the pole tube sleeve  56 . For this purpose, the sleeve  13  in the embodiment shown in  FIG. 3  carries in its end area facing away from the first connection opening  18 , with which it dips into the pole tube sleeve  56  of the pole tube  42 , a snap ring  71 , and the pole tube sleeve  56  has a corresponding ring groove  72  at the level of the snap ring  71 . In the second embodiment shown in  FIG. 3 , the connection between the pole tube sleeve  56  and the screw-in component  30  is also made via a flange corresponding to the embodiment shown in  FIGS. 1 and 2 , so that a positive connection is also produced between screw-in component  30  and pole tube sleeve  56 , with the connection enabling a compensatory movement of the pole tube sleeve  56  with respect to the screw-in component  30 . 
   In the embodiment shown in  FIG. 3 , the sleeve  13  is also held with axial play in the front bore section  33  of the screw-in component  30 . Axial play is additionally provided between the pole tube sleeve  56  and the end section of the sleeve  13  dipping into the pole tube sleeve  56 . Thus, the sleeve  13  can be pivoted not only perpendicularly to the screw-in component  30  but also perpendicularly to the pole tube sleeve  56 , for example, into a position aligned at an incline to the screw-in direction, but owing to the snap ring connection made between the sleeve  13  and the pole tube sleeve  56  it is ensured that the sleeve  13  is secured in axial direction. 
     FIG. 4  shows a third embodiment of the inventive screw-in valve which is generally designated by reference numeral  80 . It differs from the above-explained first and second embodiments in that the sleeve  13  is directly positively connected to the screw-in component  30 , with the sleeve  13  being able to be displaced and/or pivoted at an incline or perpendicularly to the screw-in direction of the screw-in component  30 , while the pole tube  42  is screwed to the screw-in component  30 . For this purpose, the pole tube sleeve  56  of the screw-in valve  80  shown in  FIG. 4  carries an external thread  81 , which interacts with an internal thread  82  of the rear bore section  33  of the screw-in component  30 . The sleeve  13  of the screw-in valve  80  dips into the front bore section  32  of the screw-in component  30  and is held in this front bore section  32  with play, with a positive connection being effected between the sleeve  13  and the screw-in component  30  by means of a retaining ring  83 . The sleeve  13  is fixed in axial direction by the retaining ring  83 , while, at the same time, owing to the radial play of the sleeve  13  in the front end section  32 , a compensatory movement of the sleeve  13  is made possible with respect to the screw-in direction of the screw-in component  30 , in particular, the sleeve  13  can be displaced in radial direction or aligned at an incline to the screw-in direction. 
     FIG. 5  shows a fourth embodiment of the inventive screw-in valve which is designated by reference numeral  90 . This differs from the screw-in valve  80  shown in  FIG. 4  in that the screw-in component  30  is integrally connected to the pole tube  42 . This makes a particularly time-saving assembly of the screw-in valve possible. 
     FIG. 6  shows a fifth embodiment in the form of a screw-in valve generally designated by reference numeral  100 . It differs from the above-described embodiments in that both the sleeve  13  and the pole tube  42  can be displaced and/or pivoted perpendicularly to the screw-in direction of the screw-in component  30 . In accordance with the embodiment of the screw-in valve  80  shown in  FIG. 4 , the sleeve  13  of the screw-in valve  100  merely dips into the front bore section  32  of the screw-in component  30  and is held therein with radial play. The sleeve  13  is axially fixed on the screw-in component  30  by means of a snap ring  101 , which surrounds in circumferential direction the end section of the sleeve  13  dipping into the front bore section  32  and dips into a corresponding ring groove  102  formed in the wall of the front bore section  32  of the screw-in component  30 . When assembling the screw-in valve  100 , the snap ring  101  is received in the compressed state by a ring groove  105  formed in the sleeve  13 . The snap ring connection, while simultaneously ensuring radial play between the sleeve  13  and the front bore section  32 , ensures that the sleeve  13  is axially immovable but displaceable and/or pivotable perpendicularly to the screw-in direction of the screw-in component  30 . 
   The connection between the screw-in component  30  and the pole tube  42  in the screw-in valve  100  shown in  FIG. 6  is made by means of a flange. For this purpose, the free end of the pole tube sleeve  56  dipping into the rear bore section  33  of the screw-in component  30  is widened in radial direction, so that a widened sleeve section  103  engages behind a rear end section  104  of the rear bore section  33  and, therefore, is axially immovably and positively connected to the screw-in component  30 . 
     FIG. 7  shows a sixth embodiment of the inventive screw-in valve. This is generally designated by reference numeral  110  and comprises a screw connection between the screw-in component  30  and the pole tube  42  comprising a pole tube sleeve  56  which is screwed via an external thread to the rear bore section  33  of the screw-in component  30 . 
   With the screw-in valve  110 , the front bore section  32  does not pass via a radially extending step but via a conical widening  111  into the rear bore section  33 . The sleeve  13  passes through the front bore section  32  and projects with its rear end facing away from the first connection opening  18  up to the level of the conical widening  111  and carries in this area a snap ring  112  which bears on the conical widening  111 . 
   The end of the sleeve  13  facing away from the first connection opening  18  is of spherical configuration and projects into a correspondingly designed spherical receptacle  113  of the pole tube sleeve  56 , which extends up to the level of the conical widening  111 . Since the sleeve  13  is also held with radial play in the front bore section  33  in the sixth embodiment shown in  FIG. 7 , the sleeve  13  can be displaced and/or pivoted perpendiculary to the screw-in component  30 , and, at the same time, it is ensured by use of the snap ring  112  that axial movement of the sleeve  13  relative to the screw-in component  30  is reliably prevented even in the event of alternating pressure load on the sleeve  13  in relation to the longitudinal axis  14 . 
   A seventh embodiment of the screw-in valve is shown in  FIG. 8  and generally designated by reference numeral  120 . In this embodiment a one-piece connection is likewise provided between the screw-in component  30  and the pole tube  42 , and the sleeve  13  is held with radial play in the front bore section  32  of the screw-in component  30 . The sleeve  13  of the screw-in valve  120  is positively connected to the screw-in component  30  by means of a flange. For this purpose, the screw-in component  30  comprises in axial direction before the external thread  35  a radially inwardly shaped collar  121  forming a positive connection with a corresponding ring groove  122  formed at the level of the collar  121  in the sleeve  13 . By means of the flange it is ensured that the sleeve  13  can be displaced and/or pivoted perpendicularly to the screw-in component  30 , and, at the same time, axial movement of the sleeve  13  relative to the screw-in component  30  is reliably prevented. 
     FIG. 9  shows an eighth embodiment of the inventive screw-in valve which is generally designated by reference numeral  130 . In accordance with the embodiment of the screw-in valve  120  explained hereinabove with reference to  FIG. 8 , a flange is also provided between the screw-in component  30  and the sleeve  13  in the screw-in valve  130 . For this purpose, the screw-in component  30  of the screw-in valve  130  likewise comprises a collar  121  which is pressed into a corresponding ring groove  122  of the sleeve  13 . 
   Whereas a one-piece connection is used between screw-in component  30  and pole tube  42  in the screw-in valve  120 , pole tube  42  and screw-in component  30  are formed separately in the screw-in valve  130  shown in  FIG. 9 . In the screw-in valve  130  the connection between the pole tube  42  and the screw-in component  30  is made by means of a flange as explained hereinabove with reference to the screw-in valve  100  shown in  FIG. 6 . Again, the pole tube sleeve  56  comprises a widened sleeve section  103  which engages behind a rear end section  104  of the rear bore section  33  of the screw-in component  30 . 
   By means of the flange connection of both sleeve  13  and pole tube  42  with the screw-in component  30  in the screw-in valve  130  it is ensured that a canting or jamming or any other misalignment of the screw-in component  30  during screwing of the screw-in valve  130  into an associated housing, for example, a control block, results neither in impairment of the movement of the valve piston  20  nor in impairment of the movement of the magnet armature  43  and/or the tappet  45 , as the pole tube  42  accommodating the electromagnet  41  can also be displaced and/or pivoted perpendicularly to the screw-in component  30 . 
   A ninth embodiment of the inventive screw-in valve is shown in  FIG. 10  and generally designated by reference numeral  140 . This likewise comprises a flange connection between the sleeve  13  and the screw-in component  30 , as explained hereinabove with reference to  FIGS. 8 and 9 . In contrast to the embodiments explained hereinabove, a two-piece pole tube  42  with a pole jacket  141  receiving the electromagnet  41  in circumferential direction and with a pole core  142  is used in the screw-in valve  140 . The tappet  45  passes through the pole core  142 , which is pressed into a connection sleeve  143 , which is integrally connected to the screw-in component  30  and is surrounded in circumferential direction by a front end area of the pole jacket  141  facing the screw-in component  30 . A flange connection is provided between the connection sleeve  143  and the pole jacket  141 . For this purpose, the connection sleeve  143  comprises on its outer side facing the pole jacket  141  a circumferential ring groove  144  into which a deformation section  145  of the pole jacket  141  is pressed. Since the connection sleeve  143  has radial play in relation to the pole jacket  141 , with the exception of the area of the ring groove  144 , the pole jacket  141  and the electromagnet  41  held thereon in circumferential direction can be aligned at an incline to the connection sleeve  143  and, therefore, also at an incline to the screw-in component  30 . This, in turn, reduces the risk that the electromagnetic actuation of the screw-in valve  130  will be impaired by the screw-in component  30  canting or becoming jammed. 
     FIG. 11  shows a tenth embodiment of the inventive screw-in valve which is generally designated by reference numeral  150 . This is similar in construction to the embodiment shown in  FIG. 7 . Differently from this, the sleeve  13  in the embodiment shown in  FIG. 11  dips into the pole tube sleeve  56 , and the receptacle  54  narrows in the direction towards the pole tube  42  via two radially extending steps  151 ,  152 . The sleeve  13  lies with its end area dipping into the pole tube sleeve  56  with play on the front step  151 , while the support body  50  is held on the rear step  152 . The sleeve  13  is received with radial and axial play by the pole tube sleeve  56 . 
   In the tenth embodiment of the inventive screw-in valve shown in  FIG. 11 , the screw-in component  30  also comprises a conical widening  111 . At the level of this widening  111 , in accordance with the sixth embodiment shown in  FIG. 7 , the sleeve  13  is surrounded by a snap ring  112  which, however, is only loaded with an axial force in the event of an axial pressure loading of the sleeve  13  oriented in the direction facing away from the screw-in component  30 , whereas in the event of an axial pressure loading of the sleeve  13  in the direction of the screw-in component  30 , i.e., to the right in  FIG. 11 , the snap ring  112  is not subjected to any axial loading, but the sleeve  13  is supported on the front step  151  of the pole tube sleeve  56 . Consequently, by use of the snap ring  112  in combination with the front step  151 , the sleeve  13  is held immovably in axial direction, while a radial displacement or pivoting movement is ensured by the play provided between the sleeve  13  and the pole tube sleeve  56  and the screw-in component  30 . This play can also be referred to as compensatory manufacturing dimension. 
   Whereas in  FIG. 11  the screw-in component  30  is connected to the pole tube  42  via a thread, in the eleventh embodiment of the inventive screw-in valve shown in  FIG. 12  a one-piece connection is provided between screw-in component  30  and pole tube  42 . The screw-in valve shown in  FIG. 12  is generally designated by reference numeral  160 . In this embodiment, the sleeve  13  is axially fixed on the screw-in component  30 , in accordance with the construction of the fifth embodiment shown in  FIG. 6 , by means of a snap ring  101 , which is received by a ring groove  102  formed in the sleeve  13  when assembling the screw-in valve  160 . The snap ring  101  is arranged in the area of the front end of the screw-in component  30  facing away from the pole tube  42 , and the outer diameter of the sleeve  13  is slightly reduced at a slight axial spacing from the snap ring  101  and from the ring groove  102  receiving it, so that the sleeve  13  is received with radial play by the through-bore  31  of the screw-in component  30 . This makes it possible to pivot the sleeve  13  in radial direction, in order to correct any misalignment of the screw-in component  30  when screwing it into a housing receiving the screw-in valve  160 .