Patent Publication Number: US-2017370492-A1

Title: Valve for controlling the water flow in a sanitary line

Description:
The invention relates to a valve for controlling the water flow in a sanitary line, which comprises a housing having a housing lower part and a housing upper part. In this case, a water supply channel portion, and, downstream thereof, a control channel and a water drain channel portion are arranged in the housing lower part. 
     Such control valves are generally known and have been used for some time in the form of solenoid valves in buildings and vehicles of all types. 
     Monostable or bistable solenoid valves known from the prior art are typically servo-controlled, by arranging a switching valve having an electromagnetically moved valve piston adjacent to the actual control valve. The control valve comprises a flexible rubber membrane having a small passage opening. The control valve opens when the piston of the switching valve moves out of its seat using magnetic force and water reaches a switching bypass from the sanitary line via the small passage opening in the control valve membrane. The switching bypass comprises a water volume on the rear of the control valve membrane and a bypass line, which leads via the seat of the switching valve and discharges into the sanitary line following downstream from the solenoid valve. The piston of the switching valve moves in a water-filled cylinder. The control valve actually opens because the water pressure present in the sanitary line on the front of the control valve membrane is higher than the counter pressure in the volume on the rear thereof, because this counter pressure is reduced due to the draining water via the bypass line, since the cross section of the bypass supplying the water is smaller than the cross section of the bypass draining the water. If the switching valve is closed by pressing the valve piston onto its seat, the flow through the bypass line is thus stopped and the control valve membrane is pressed back onto its seat surfaces with spring assistance, so that the control valve is also closed. The partially simple design thereof, the short reaction time thereof (time for opening or closing the valve measured from the initiation of the respective action), and the low power consumption thereof can be mentioned as advantages of solenoid valves. 
     The presence of a rubber membrane is to be mentioned as a significant disadvantage of such solenoid valves, because the use of rubber membranes (in particular in hot water lines) is increasingly forbidden. Moreover, solenoid valves tend toward soiling (clogging of the bypass line and/or permanent flow through the valve because of soiling of the control valve seat), because of which a solenoid valve usually has a dirt filter upstream from the control valve. However, the avoidance of dead volumes in control valves is becoming more and more important, because standing water in dead volumes (such as, for example, in the water volume on the rear of the control valve membrane and/or in the water-filled cylinder of the switching valve of solenoid valves) enables the growth of microorganisms. Infected dead volumes contaminate the sanitary line adjoining downstream on the control valve; water contaminated with microorganisms seriously puts the health of the population into question, however. Needle valves, which are also known from the prior art, are not suitable for controlling the water flow in a sanitary line because of the excessively long reaction time thereof and the relatively large lifting force to be applied to open a needle valve. 
     The object of the present invention is to propose an alternative valve for controlling the water flow in a sanitary line, which eliminates the disadvantages of known control valves from the prior art. 
     This object is achieved with a control valve according to the features of claim  1 , by proposing a valve for controlling the water flow in a sanitary line, which comprises:
     a) a housing having a housing lower part and a housing upper part, wherein a water supply channel portion and, downstream thereof, a control channel and a water drain channel portion are arranged in the housing lower part.   

     The control valve according to the invention is characterized in that it additionally comprises:
     b) a valve upper part having a headpiece and a spindle, wherein the headpiece is arranged at least partially in a housing bore coaxially to the bore axis thereof, wherein the spindle is arranged so it is radially rotatable in a headpiece bore coaxial to the housing bore, and wherein the headpiece comprises a wall, which partially encloses the spindle and which is arranged so it engages in the control channel of the control valve;   c) a stator disk, which is arranged in the control channel coaxially to the headpiece bore and is fastened on the headpiece, having at least one through-flow opening, which penetrates this first valve disk, and having a first ceramic surface;   d) a rotor disk, which is arranged coaxially to the headpiece bore in the control channel and is engaged with the spindle, having at least one through-flow opening penetrating this second valve disk and having a second ceramic surface arranged downstream of the stator disk, which lies so it is axially rotatable on the first ceramic surface of the stator disk; and   e) an electrical drive, which is arranged in the housing upper part and is engaged with the spindle of the valve upper part.   

     The control valve according to the invention is additionally characterized in that a first circumferential seal of the headpiece presses against a surface of this housing bore to form a seal and a second circumferential seal of the spindle presses against an inner surface of the headpiece bore to form a seal, so that these seals seal off the control channel of the control valve in relation to the housing upper part. The control valve according to the invention is additionally characterized in that the headpiece wall comprises at least one window arranged in the region of the control channel, which is oriented, opposite to the water drain channel portion, toward the surface of the housing bore, whereby complete flushing through of the control channel is ensured when the control valve is open. 
     Further features according to the invention result from the dependent claims. Advantages of the control valve according to the invention comprise:
     1) No rubber membrane is used, so that the conditions of all relevant authorities can be met.   2) The valve disks used, which are made of ceramic or at least have ceramic surfaces thereof oriented toward one another and forming seals on one another, are insensitive to soiling.   3) A bypass line does not exist, but rather upon each opening of the control valve, thanks to the special seal in relation to the housing upper part and thanks to the special guidance of the water flow in the control channel through a window oriented to the rear, the entire control channel and therefore all water-conducting parts of the control valve are completely flushed through. Therefore, no dead volumes exist in this control valve.   

    
    
     
       The control valve according to the invention will be explained on the basis of drawings, which show an exemplary embodiment, and on the basis of diagrams, which illustrate a selection of possible further embodiments. In the figures: 
         FIG. 1  shows a vertical longitudinal section through a standing control valve according to a first embodiment in a closed state, wherein the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis, and wherein the outflow bore and the water drain channel portion are arranged coaxially to one another; 
         FIG. 2  shows a vertical longitudinal section through the standing control valve of  FIG. 1  in an open state; 
         FIG. 3  shows a partially cutaway  3 D illustration of the control valve of  FIG. 1  in the closed state, viewed from above; 
         FIG. 4  shows a partially cutaway  3 D illustration of the control valve of  FIG. 2  in the open state, viewed from above; 
         FIG. 5  shows a horizontal longitudinal partial section through the control valve of  FIGS. 1 and 3  with indicated section guide for  FIG. 1 ; 
         FIG. 6  shows a horizontal longitudinal partial section through the control valve of  FIGS. 2 and 4  with indicated section guide for  FIG. 2 ; 
         FIG. 7  shows a top view of the two valve disks with closed control valve corresponding to  FIGS. 1, 3, and 5 ; 
         FIG. 8  shows a top view of the two valve disks with open control valve corresponding to  FIGS. 2, 4, and 6 ; 
         FIG. 9  shows a partially cutaway  3 D illustration of the control valve of  FIG. 2  in the open state, viewed from below; 
         FIG. 10  shows a schematic illustration of a side view of 16 selected embodiments, wherein in: 
         FIG. 10A  corresponding to the illustration in  FIGS. 1 to 9 , the water drain channel portion is arranged coaxially in relation to the water supply channel portion; 
         FIG. 10B  the water drain channel portion is arranged axially parallel in relation to the water supply channel portion; 
         FIG. 10C  the water drain channel portion is arranged angled in relation to the water supply channel portion; 
         FIG. 10D  the water drain channel portion is arranged axially parallel in relation to the water supply channel portion 
         FIG. 10E  the water drain channel portion is arranged angled in relation to the water supply channel portion; 
         FIG. 10F  the water drain channel portion is arranged angled in relation to the water supply channel portion; 
         FIG. 10G  the water drain channel portion is arranged axially parallel in relation to the water supply channel portion; 
         FIG. 10H  the water drain channel portion is arranged angled in relation to the water supply channel portion; 
         FIG. 10I  the water drain channel portion is arranged axially parallel in relation to the water supply channel portion; 
         FIG. 10J  the water drain channel portion is arranged angled in relation to the water supply channel portion; 
         FIG. 10K  the water drain channel portion is arranged axially parallel in relation to the water supply channel portion; 
         FIG. 10L  the water drain channel portion is arranged axially parallel in relation to the water supply channel portion; 
         FIG. 10M  the water drain channel portion is arranged axially parallel in relation to the water supply channel portion; 
         FIG. 10N  the water drain channel portion is arranged angled in relation to the water supply channel portion; 
         FIG. 10O  the water drain channel portion is arranged coaxially in relation to the water supply channel portion; 
         FIG. 10P  the water drain channel portion is arranged angled in relation to the water supply channel portion; 
         FIG. 11  shows a schematic illustration in a top view of 12 selected embodiments, wherein in: 
         FIG. 11A  corresponding to the illustration in  FIGS. 1 to 9 , the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis and coaxially; 
         FIG. 11B  the water drain channel portion and the water supply channel portion are arranged in two planes intersecting the bore axis and in an angled manner; 
         FIG. 11C  the water drain channel portion and the water supply channel portion are arranged in two planes intersecting the bore axis and in an angled manner; 
         FIG. 11D  the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis and axially parallel; 
         FIG. 11E  the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis and in an angled manner; 
         FIG. 11F  the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis and in an angled manner; 
         FIG. 11G  the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis and in an angled manner; 
         FIG. 11H  the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis and coaxially; 
         FIG. 11I  the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis and axially parallel; 
         FIG. 11J  the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis and axially parallel; 
         FIG. 11K  the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis and in an angled manner; 
         FIG. 11L  the water supply channel portion and the water drain channel portion are arranged in a plane common with the bore axis and in an angled manner. 
     
    
    
     The control valve according to the invention will now be explained in detail on the basis of the appended figures and with reference to selected embodiments, which do not restrict the scope of the present invention. 
       FIG. 1  shows a vertical longitudinal section through a standing control valve  1  according to a first embodiment in a closed state, wherein the water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13 , and wherein the outflow bore  33  and the water drain channel portion  8  are arranged coaxially to one another. This valve  1  for controlling the water flow in a sanitary line  2 , in a heating line  2 ′, or in a cooling line  2 ″ comprises a housing  3  having a housing lower part  4  and a housing upper part  5 . In this case, a water supply channel portion  6  and, downstream thereof in the flow direction, a control channel  7  and a water drain channel portion  8  are arranged in the housing lower part  4 . 
     The control valve  1  additionally comprises a valve upper part  9  having a headpiece  10  and a spindle  11 . Such valve upper parts are known per se from the prior art and are routinely installed in gas fittings or sanitary fittings (cf. in this regard, for example, EP 0 335 997 B1). The headpiece  10  is at least partially arranged in a housing bore  12  coaxially to the bore axis  13  thereof, wherein the spindle  11  is arranged so it is radially rotatable in a headpiece bore  14  coaxial to the housing bore  12 . The headpiece  10  additionally comprises a wall  15 , which partially encloses the spindle  11  and which is arranged so it engages in the control channel  7  of the control valve  1 . 
     As is typical for such a valve upper part  9 , it comprises a stator disk  16 , which is fastened on the headpiece  10 , having at least one through-flow opening  17  penetrating this first valve disk  16  and having a first ceramic surface  18 . This stator disk  16  can (as shown here) consist entirely of ceramic material and is arranged here in the control channel  7  coaxially to the headpiece bore  14 . Alternatively, this stator disk  16  can also consist of a metal, a plastic, or a composite material, wherein all alternative stator disks  16  also have to comprise such a first ceramic surface  18 , independently of further materials which are present. 
     Furthermore, the valve part  9  comprises a rotor disk  19 , which is arranged in the control channel  7  coaxially to the headpiece bore  14  and is engaged with the spindle  11 , having at least one through-flow opening  20  which penetrates this second valve disk  19  and having a second ceramic surface  21  arranged downstream from the stator disk  16 . This rotor disk  19  can (as shown here) consist entirely of ceramic material and is arranged here in the control channel  7  coaxially to the headpiece bore  14 . Alternatively, this rotor disk  19  can also consist of a metal, a plastic, or a composite material, wherein all rotor disks  19  also have to comprise such a second ceramic surface  21 , independently of further materials which are present. 
     The second ceramic surface  21  of the rotor disk  19  lies so it is axially rotatable on the first ceramic surface  18  of the stator disk  16 , as is also typical for such valve upper parts  9 . The low risk of soiling of the ceramic surfaces  18 ,  21 , which permanently slide on one another, the relatively small rotational angle of approximately 90° required for completely opening or closing the valve, and the short time span linked thereto, which is required for completely opening or closing the valve, are the great advantages of such valve upper parts  9  sealed by means of ceramic surfaces  18 ,  21 . 
     The control valve  1  additionally comprises an electrical drive  22 , which is arranged in the housing upper part  5  and is engaged with the spindle  11  of the valve upper part  9 . A first circumferential seal  23  of the headpiece  10  presses against a surface  24  of this housing bore  12  to form a seal and a second circumferential seal  25  of the spindle  11  presses against an inner surface  26  of the headpiece bore  14  to form a seal such that these seals  23 ,  25  seal off the control channel  7  of the control valve  1  in relation to the housing upper part  5 . The headpiece wall  15  comprises at least one window  27 , which is arranged in the region of the control channel  7  and which is oriented, opposite to the water drain channel portion  8 , toward the surface  24  of the housing bore  12 , wherein when the control valve  1  is open, complete flushing through of the control channel  7  is ensured. 
     It is apparent to a person skilled in the art upon observation of  FIG. 1  that the control valve  1  is shown here in the closed state. He sees this from the fact that the valve disk  19  designed as a rotor disk is shown in its cross section, which does not display a through-flow opening  20 . A comparable position of this rotor disk  19  is shown in  FIG. 7 . In this position of the rotor disk  19 , the through-flow openings  17  of the stator disk  16  are covered; the ceramic valve comprising the two valve disks  16 ,  19  is therefore closed. In addition, the two windows  27  are substantially concealed by the rotor disk  19 . Because no water flows through this control valve  1 , only the inflow side, i.e., the opening of the water supply channel portion  6  or the transition from the sanitary line  2 , the heating line  2 ′, or the cooling line  2 ″ into the water supply channel portion  6  of the control valve  1  is identified with an arrow. 
       FIG. 2  shows a vertical longitudinal section through the standing control valve  1  of  FIG. 1  in an open state. It is apparent to a person skilled in the art upon observation of  FIG. 2  that the control valve  1  is shown here in the open state. He sees this from the fact that the valve disk  19  designed as a rotor disk is shown in its cross section, which displays two through-flow openings  20 . A comparable position of this rotor disk  19  is shown in  FIG. 8 . In this position of the rotor disk  19 , the through-flow openings  20  thereof are in register one over another with the through-flow openings  17  of the stator disk  16 ; the ceramic valve comprising the two valve disks  16 ,  19  is therefore open. The two open windows  27  are well visible here, which are not concealed by the rotor disk  19 . The water flow through the open control valve  1  is shown by dashed lines. Because water can flow through this control valve  1 , the inflow side and the outflow side, i.e., the openings of the water supply channel portion  6  and the water drain channel portion  8  or the transitions between sanitary line  2 , heating line  2 ′, or cooling line  2 ″ and control valve  1  are each identified with an arrow. 
       FIG. 2  shows the same first embodiment of the control valve  1  according to the present invention as  FIG. 1 . The elements shown in  FIG. 2  are therefore the same as in  FIG. 1 , so that here—except for the state of the valve opening—the same statements already made apply. 
     The following definitions apply in the meaning of the present invention: A window  27  is opposite to the water drain channel portion  8  if the largest part of the window opening, seen from the water drain channel portion  8 , is located behind a plane which extends through the bore axis  13  and perpendicularly to the axis of the water drain channel portion  8 . The location or the level of the seal  23  is assumed as the boundary between the housing lower part  4  and the housing upper part  5 , because this seal  23  delimits the control channel  7  in relation to the housing upper part  5 . 
     The first circumferential seal  23  of the headpiece  10  preferably presses without a gap against the surface  24  of the housing bore  12 ; independently thereof or in combination therewith, it is preferable for the second circumferential seal  25  of the spindle  11  to press without a gap against the inner surface  26  of the headpiece bore  14 . Preferably the first seal  23  presses against the surface  24  of the housing bore  12  in the immediate vicinity of the water drain channel portion  8 . 
     Preferably, the control valve  1  comprises an inflow bore  28 , which is arranged coaxially to the housing bore  12 ; independently thereof or in combination therewith, this housing bore  12  preferably adjoins the water supply channel portion  6  downstream and is connected to the control channel  7  via a shoulder  29 . The control valve  1  preferably additionally comprises a first through-flow channel  30 , which connects the water supply channel portion  6  to the inflow bore  28 . 
     It is particularly preferable for the stator disk  16  of the control valve  1  to be fastened in the headpiece bore  14  by means of a ring seal  32 , which is pressed through a terminal opening  31  in the headpiece wall  15 , in the headpiece  10  of the valve upper part  9 . In addition, it is preferable for the ring seal  32  to be applied to the shoulder  29  to form a seal and therefore to seal off the control channel  7  in relation to the inflow bore  28 . 
     The control valve  1  according to the invention preferably comprises an outflow bore  33 , which is arranged perpendicularly to the housing bore  12  and adjoining upstream from the water drain channel portion  8  and is connected to the control channel  7 . Depending on the design of the control valve  1 , it can comprise a second through-flow channel  34 , which connects the outflow bore  33  to the water drain channel portion  8 . The first seal  23  preferably presses against the surface  24  of the housing bore  12  in the immediate vicinity of the outflow bore  33 . 
     According to one selected embodiment of the control valve  1  according to the invention, the water drain channel portion  8  is preferably arranged coaxially, axially parallel, or angled in relation to the water supply channel portion  6  (cf. entire  FIG. 10 ). On the one hand, it can be provided in this case that the inflow bore  28 , the housing bore  12 , and the water supply channel portion  6  are arranged coaxially to one another (cf.  FIGS. 10F, 10K, and 10L ). On the other hand, it can be provided in this case that the outflow bore  33  and the water drain channel portion  8  are arranged coaxially to one another (cf.  FIGS. 10A to 10H ). It is especially preferable for the inflow bore  28  to be arranged coaxially to the housing bore  12  and the control channel  7 . It is also especially preferable for the outlet bore  33  to be arranged perpendicularly to the housing bore  12  and also to the control channel  7  (cf.  FIGS. 10A to 10P ). 
     A further embodiment of the control valve  1  according to the invention is defined in that the water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13  (cf.  FIGS. 11A and 11D to 11L ). An alternative embodiment of the control valve  1  according to the invention is defined in that the water drain channel portion  8  and the water supply channel portion  6  are arranged in two planes  36 ,  36 ′ intersecting in the bore axis  13  (cf.  FIGS. 11B and 11C ). 
     A control valve  1  is preferred in which the electrical drive  22  is engaged via a transmission  37  with the spindle  11  of the valve upper part  9 . It is particularly preferable for the electrical drive  22  to comprise a stepping motor  38  and an emergency power source  39 . This emergency power source  39  can be designed, for example, as a battery, a rechargeable battery, a capacitor, or as a combination of these electrical components. 
     As shown in  FIGS. 1 and 2 , in the preferred first embodiment of the control valve  1  according to the invention, the headpiece  10  comprises at least two windows  27  distributed uniformly on the circumference, of which one (the one shown on the right side of the bore axis  13 ) is oriented, opposite to the water drain channel portion  8 , toward the surface  24  of the housing bore  12  and ensures complete flushing through of the control channel  7  to avoid dead volumes when the control valve  1  is open. 
     The control valve  1  preferably comprises a temperature sensor  40 , which is designed to measure the water temperature and is connected to a temperature regulating unit  41 . This temperature sensor  40  is preferably arranged in the control valve  1  to measure the water temperature. Two particularly preferred installation locations for the temperature sensor  40  are shown in  FIGS. 1 and 2 :
         in a bore of the spindle  11  or   in a niche in the housing lower part.       

     Both installation locations ensure that the surface of the temperature sensor has intensive contact with water-conducting or water-contacting elements of the control valve  1  and can thus reliably measure the temperature of the water flowing through the control valve  1 . This surface contact can be further improved using known means, such as heat conduction paste, etc. In addition, the bore in the spindle  11  can be formed deeper than shown, so that the temperature sensor  40  comes to rest closer to the surface of the spindle  11  which is in contact with water (particularly well visible in  FIG. 2 ). The temperature sensor  40  preferably does not come into direct contact with water. 
     While the electrical lines for the temperature sensor  40 , which is held stationary in the housing lower part niche, are not subjected to a torsion movement, flexible electrical lines are preferably used for the temperature sensor held rotatably in the spindle bore. The relatively small rotational angle of the spindle  11  of approximately 90°, which is necessary to completely open or close the control valve  1 , does not represent a large technical obstacle in this case. 
     The control valve  1  according to the invention preferably comprises a flow sensor  42 , which is designed to measure the water flow and is connected to a flow rate regulating unit  43 . The flow sensor  42  is particularly preferably arranged in a through-flow channel  30 ,  34  or in a portion, arranged before or after the control valve  1 , of the sanitary line  2 , heating line  2 ′, or cooling line  2 ″. In  FIGS. 1 and 2 , the flow sensor  42  is shown as a propeller and is arranged in each case in the first through-flow channel  30 . 
     To securely close the control valve  1  in relation to the environment, it preferably comprises a cover  45  for terminating the housing upper part  5 . The temperature regulating unit  41  and/or the flow rate regulating unit  43  are preferably arranged on a printed circuit board  44  in the housing upper part  5  or in the cover  45  of the valve  1 . 
     An introduction point for electrical lines (cf. lightning symbols) is shown in  FIGS. 1 and 2  in the region of the cover  45 . This line introduction point is preferably equipped with a tension relieving element  52 , as shown by way of example in  FIG. 2 . 
     The printed circuit board  44  having the electronic components for controlling the electric motor  38  is reasonably arranged in the immediate vicinity of this line introduction point in the cover  45 . The electronic components of a possibly provided temperature regulating unit  41  and also an optional flow rate regulating unit  43  are preferably arranged on this printed circuit board  44 . 
       FIG. 3  shows a partially cutaway  3 D illustration of the control valve  1  of  FIG. 1  in a closed state, viewed from above. The housing  3  and the cover  45  of the control valve  1  are visible and shown. A scale  47  of the temperature regulating unit  41  is depicted on the cover. A selection wheel  46  of the temperature regulating unit  41  is shown in  FIG. 2 , is operationally connected to the temperature controller  41 , and is used for preselection of a selected water temperature, for example, by setting a pointer to a determined temperature value of the scale  47 . 
     In  FIG. 3 , the flow sensor  42  is shown as a propeller and is arranged in the portion of the sanitary line  2 , heating line  2 ′, or cooling line  2 ″ before the control valve  1  (cf.  FIGS. 1 and 2 ). In the cutaway part of the control valve  1 , the headpiece  10  of the valve upper part  9  and the headpiece wall  15  are shown. The valve disks  16 ,  19 , which are pivoted toward one another to form a seal, are also visible. The through-flow opening  20  of the rotor disk  19  points here in a direction perpendicular to the outflow bore  33  and the water drain channel portion  8 ; it is apparent therefrom that the control valve  1  is closed. The headpiece wall  15  is held centered by webs  50  in the seat  49  (cf.  FIG. 9 ). A directional cam  48  of the valve disk  16 , which engages in a groove  51  (cf.  FIGS. 1 and 2 ) and thus prevents this stator disk  16  from being able to change its location upon rotation of the rotor disk  19 , is also visible. Because the control valve  1  is closed, only one flow arrow before the water supply channel portion  6  is shown. 
       FIG. 4  shows a partially cutaway  3 D illustration of the control valve  1  of  FIG. 2  in an open state, viewed from above. The housing  3  and the cover  45  of the control valve  1  are visible and shown. As in  FIG. 3 , a scale  47  of the temperature regulating unit  41  is depicted on the cover. 
     In  FIG. 4 , the flow sensor  42  is shown as a propeller and is arranged in the portion of the sanitary line  2 , heating line  2 ′, or cooling line  2 ″ after the control valve  1  (cf.  FIGS. 1 and 2 ). The headpiece  10  of the valve upper part  9  and the headpiece wall  15  are shown in the cutaway part of the control valve  1 . The opposing valve disks  16 ,  19  having the through-flow openings  17 ,  20  arranged in register one over another are also visible. The through-flow opening  20  of the rotor disk  19  points here in a direction facing axially-parallel to the outflow bore  33  and the water drain channel portion  8 ; it is apparent therefrom that the control valve  1  is open. The headpiece wall  15  is held centered by webs  50  in the seat  49  (cf.  FIG. 9 ). A directional cam  48  of the valve disk  16 , which engages in a groove  51  (cf.  FIGS. 1 and 2 ) and thus prevents this stator disk  16  from being able to change its location upon rotation of the rotor disk  19 , is also visible. Because the control valve  1  is open, a flow arrow is shown in each case before the water supply channel portion  6  and after the water drain channel portion  8 . 
       FIG. 5  shows a horizontal longitudinal partial section through the closed control valve  1  of  FIGS. 1 and 3  with section guide shown for  FIG. 1  (cf. double arrow  1 - 1 ). The common plane  35 , in which the water supply channel portion  6 , the water drain channel portion  8 , and also the bore axis  13  are all arranged is visible and shown. The seat  49  for holding and centering the headpiece wall  15  of the valve upper part  9  in the housing lower part  4  of the control valve  1  according to the invention is marked with curved brackets. Multiple (at least three) webs  50 , which actually exercise the seat function with little play in relation to the headpiece wall  15  of the valve upper part  9 , are arranged around this seat  49 . The control channel  7  comprises the entire seat  49  having its webs  50  and the regions  50 ′ located between each two webs  50 . If a web  50  is provided in the region of the water drain channel portion  8  (as shown) or in the region of the outflow bore  33 , this web  50  preferably has a narrow shape to impair the water flow as little as possible (as shown). 
     If, for example, a seat  49  having three webs  50  is provided, advantageously none of the webs  50  is arranged in the region of the water drain channel portion  8  or in the region of the outflow bore  33 ; in this case, one web  50  is preferably located in the region of the common plane  35  on the side of the housing bore  12  opposite to the channel portion  8  or the outflow bore  33 . This arrangement of the web  50  additionally has the advantage that with open control valve  1 , the water flow from the window  27  of the valve upper part  9  is conducted divided in two and into the regions  50 ′ located on the left and right of the web  50  (cf.  FIG. 6 ). Complete flushing through of the control channel  7  is also ensured in this case to avoid dead volumes. 
     The through-flow openings  20  of the rotor disk  19  point here in a direction facing perpendicularly to the water drain channel portion  8 ; it is apparent therefrom that the control valve  1  is closed. The first ceramic surface  18  of the stator disk  16  is visible in the regions of the through-flow openings  20  of the rotor disk  19 . Two directional cams  48 , which are comprised by the stator disk  16 , and fix the stator disk  16  in its location, are also visible here. 
       FIG. 6  shows a horizontal longitudinal partial section through the open control valve  1  of  FIGS. 2 and 4  with section guide shown for  FIG. 2  (cf. double arrow  2 - 2 ). The through-flow openings  20  of the rotor disk  19  lie here in the common plane  35  and point directly toward the water drain channel portion  8  or in the opposite direction. The through-flow openings  20  of the rotor disk  19  are located here directly above the through-flow openings  17  of the stator disk  16 ; it is apparent therefrom that the control valve  1  is open. Two directional cams  48 , which are comprised by the stator disk  16 , and which fix the stator disk  16  in its location, are also well visible here. The further statements on  FIG. 5  also apply accordingly to  FIG. 6 , so that—except for the following remarks—a repetition will be omitted. 
       FIG. 6  shows an arrangement of one web  50  in the region of the common plane  35  on the side of the housing bore  12  opposite to the water drain channel portion  8  or the outflow bore  33 . In this web arrangement, the window  27  of the valve upper part  9 , which is arranged on the opposite side of the housing bore  12  in relation to the water drain channel portion  8  or the outflow bore  33 , is oriented on this web  50 . This has the advantage that with open control valve  1 , the water flow from this window  27  is divided in two and (as shown) is conducted into the regions  50 ′ located on the left and right of the web  50 . Complete flushing through of the control channel  7  is therefore ensured, so that dead volumes in the control channel  7  are avoided. 
       FIG. 7  shows a top view of the two valve disks  16 ,  19  with closed control valve  1  corresponding to  FIGS. 1, 3, and 5 .  FIG. 7  is an enlarged illustration of the two valve disks  16 ,  19  shown in  FIG. 5 . The two directional cams  48 , which are comprised by the stator disk  16  and which fix the stator disk  16  in its location in the valve upper part  9 , are especially well visible here. The two directional cams  48  are arranged diametrically opposing on the circumference of the stator disk  16  and both lie in the common plane  35  (cf.  FIG. 5 ). The through-flow openings  20  of the rotor disk  19  point here in a direction facing perpendicularly to the directional cams  48 , the control valve  1  is closed. The first ceramic surface  18  of the stator disk  16  is visible in the regions of the through-flow openings  20  of the rotor disk  19 . 
       FIG. 8  shows a top view of the two valve disks  16 ,  19  with open control valve corresponding to  FIGS. 2, 4, and 6 .  FIG. 8  is an enlarged illustration of the two valve disks  16 ,  19  shown in  FIG. 6 . The two directional cams  48 , which are comprised by the stator disk  16 , and which fix the stator disk  16  in its location in the valve upper part  9 , are especially well visible here. The through-flow openings  20  of the rotor disk  19  lie here in the common plane  35  (cf.  FIG. 6 ) and point directly toward the two direction cams  48 . The through-flow openings  20  of the rotor disk  19  are directly above the through-flow openings  17  of the stator disk  16  here, the control valve  1  is open. 
     Notwithstanding the illustration in  FIGS. 1-8 , only one or more than two directional cams  48  can also be used for fixing the stator disk  16  in the headpiece wall  15  of the valve upper part  9  (i.e., for preventing twisting of the valve disk  16 ). Two diametrically opposing directional cams  48  arranged on the outer circumference of the valve disks  16 , which engage in correspondingly formed and arranged grooves  51  on the inner side of the headpiece wall  15 , are preferred. 
       FIG. 9  shows a partially cutaway  3 D illustration of the control valve  1  of  FIG. 2  in the open state, viewed from below. The housing  3  and the cover  45  and also the outlet bore  33  and the water drain channel portion  8  of the control valve  1  are visible and shown. The headpiece  10  and the spindle  11  of the valve upper part  9  as well as the headpiece wall  15  thereof are shown in the cutaway part of the control valve  1 . The two windows  27  and the terminal opening  31  in the headpiece wall  15  are also visible. In the window  27 , which is oriented toward the outflow bore  33  and the water drain channel portion  8  of the control valve  1 , the through-flow opening  20  of the rotor disk  19  of the open control valve  1  can be seen, the direction of the water flow is therefore marked with an arrow in the region of the water drain channel portion  8 . The bore axis  13  of the housing bore  12  is marked and the first through-flow channel  30  and the inflow bore  28  having the shoulder  29  adjoining thereon are visible around the housing lower part  4 . 
     The ring seal  32 , which is pressed through the terminal opening  31  in the headpiece wall  15  and is applied to the stator disk  16 , is also visible; this valve disk  16  is therefore fastened in the headpiece bore  14  of the valve upper part  9 , so that it also cannot move in the direction of the bore axis  13 . This ring seal  32  is applied to the shoulder  29  to form a seal and therefore seals off the control channel  7  in relation to the inflow bore  28 . The seat  49  between the webs  50  is also marked, wherein the narrow web  50  is shown, which is arranged axially in the common plane  35  (cf.  FIGS. 5, 6 ) and in the outflow bore  33 . 
       FIG. 10  shows a schematic illustration of a side view of 16 selected embodiments of the control valve  1  according to the invention. All embodiments shown have a fundamentally identical arrangement of the inflow bore  28 , the control channel  7 , and the outflow bore  33 , in that the inflow bore  28  and the control channel  7  are arranged coaxially to one another and to the bore axis  13  of the control valve  1 , while the outflow bore  33  is always arranged perpendicularly to the bore axis  13  and therefore to the spindle  11 . The 16 embodiments shown differ from one another by way of the individual arrangement thereof of the elements water supply channel portion  6 , first through-flow channel  30 , second through-flow channel  34 , and water drain channel portion  8 . In the selection of the 16 embodiments shown, depicting simply mirror-inverted variants was omitted; of course, these variants similar to mirror images are also within the scope of the present invention. The motor  38  for driving the spindle  11  is always located in the housing upper part  5  (cf.  FIGS. 1, 2 ). 
       FIG. 10A  shows, corresponding to the illustration in  FIGS. 1 to 9 , a first embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged coaxially in relation to the water supply channel portion  6 . The water supply channel portion  6  and the water drain channel portion  8  are each arranged on opposite sides of the control valve  1 , i.e., on both sides of the spindle  11 . The first through-flow channel  30  extends at an angle in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is practically not provided or is very short and is arranged coaxially to the water drain channel portion  8 . 
       FIG. 10B  shows a second embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged axially parallel in relation to the water supply channel portion  6 . Water supply channel portion  6  and water drain channel portion  8  are each arranged on opposite sides of the control valve  1 , i.e., on both sides of the spindle  11 . The first through-flow channel  30  extends at an angle in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is practically not provided or is very short and is arranged coaxially to the water drain channel portion  8 . 
       FIG. 10C  shows a third embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged at an angle in relation to the water supply channel portion  6 . The water supply channel portion  6  is arranged on the upper side and the water drain channel portion  8  is arranged on one side of the control valve  1 , i.e., on both sides of the spindle  11 . The first through-flow channel  30  extends at an angle in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is practically not provided or is very short and is arranged coaxially to the water drain channel portion  8 . 
       FIG. 10D  shows a fourth embodiment of the control valve  1  according to the invention, in which the water flow channel portion  8  is arranged axially parallel in relation to the water supply channel portion  6 . The water supply channel portion  6  is arranged on one side and the water drain channel portion  8  is arranged on the other side of the control valve  1 , i.e., on both sides of the spindle  11 . The first through-flow channel  30  extends coaxially in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is practically not provided or is very short and is arranged coaxially to the water drain channel portion  8 . 
       FIG. 10E  shows a fifth embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged at an angle in relation to the water supply channel  6 . The water supply channel portion  6  is arranged on the lower side and the water drain channel portion  8  is arranged on one side of the control valve  1 , i.e., on both sides of spindle  11 . The first through-flow channel  30  extends at an angle in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is practically not provided or is very short and is arranged coaxially to the water drain channel portion  8 . 
       FIG. 10F  shows a sixth embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged at an angle in relation to the water supply channel portion  6 . The water supply channel portion  6  is arranged on the lower side and the water drain channel portion  8  is arranged on one side of the control valve  1 , i.e., not on both sides of the spindle  11 . The first through-flow channel  30  extends coaxially in relation to the water supply channel portion  6  and coaxially adjoins the inflow bore  28 . The second through-flow channel  34  is practically not provided or is very short and is arranged coaxially to the water drain channel portion  8 . 
       FIG. 10G  shows a seventh embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged axially parallel in relation to the water supply channel portion  6 . The water supply channel portion  6  is arranged on the same side of the control valve  1  as the water drain channel portion  8 , i.e., on one side of the spindle  11 . The first through-flow channel  30  extends coaxially in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is practically not provided or is very short and is arranged coaxially to the water drain channel portion  8 . 
       FIG. 10H  shows an eighth embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged at an angle in relation to the water supply channel portion  6 . The water supply channel portion  6  is arranged on the lower side and the water drain channel portion  8  is arranged on one side of the control valve  1 , i.e., on one side of the spindle  11 . The first through-flow channel  30  extends at an angle in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is arranged coaxially to the water drain channel portion  8 . 
       FIG. 10I  shows a ninth embodiment of the control valve  1  according to the invention, in which the water drain channel portion is arranged axially parallel in relation to the water supply channel portion. The water supply channel portion  6  is arranged on the upper side and the water drain channel portion  8  is arranged on the lower side of the control valve  1 , i.e., on both sides of the spindle  11 . The first through-flow channel  30  extends at an angle in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is arranged at an angle in relation to the water drain channel portion  8 . 
       FIG. 10J  shows a tenth embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged at an angle in relation to the water supply channel portion  6 . The water supply channel portion  6  is arranged on one side and the water drain channel portion  8  is arranged on the lower side of the control valve  1 , i.e., on both sides of the spindle  11 . The first through-flow channel  30  extends coaxially in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is arranged at an angle in relation to the water drain channel portion  8 . 
       FIG. 10K  shows an eleventh embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged axially parallel in relation to the water supply channel portion  6 . The water supply channel portion  6  and the water drain channel portion  8  are arranged on the lower side of the control valve  1 , i.e., not on both sides of the spindle  11 . The first through-flow channel  30  extends coaxially in relation to the water supply channel portion  6  and adjoins the inflow bore  28  coaxially. The second through-flow channel  34  is arranged at an angle in relation to the water drain channel portion  8 . 
       FIG. 10L  shows a twelfth embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged axially parallel in relation to the water supply channel portion  6 . The water supply channel portion  6  is arranged on the lower side and the water drain channel portion  8  is arranged on the upper side of the control valve  1 , i.e., not on both sides of the spindle  11 . The first through-flow channel  30  extends coaxially in relation to the water supply channel portion  6  and adjoins the inflow bore  28  coaxially. The second through-flow channel  34  is arranged at an angle in relation to the water drain channel portion  8 . 
       FIG. 10M  shows a thirteenth embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged axially parallel in relation to the water supply channel portion  6 . The water supply channel portion  6  is arranged on the lower side and the water drain channel portion  8  is arranged on the upper side of the control valve  1 , i.e., on both sides of the spindle  11 . The first through-flow channel  30  extends at an angle in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is arranged at an angle in relation to the water drain channel portion  8 . 
       FIG. 10N  shows a fourteenth embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged at an angle in relation to the water supply channel portion  6 . The water supply channel portion  6  is arranged on one side and the water drain channel portion  8  is arranged on the upper side of the control valve  1 , i.e., on both sides of the spindle  11 . The first through-flow channel  30  extends coaxially in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is arranged at an angle in relation to the water drain channel portion  8 . 
       FIG. 10O  shows a fifteenth embodiment of the control valve  1  according to the invention, in which the water drain channel portion  8  is arranged coaxially in relation to the water supply channel portion  6 . The water supply channel portion  6  is arranged on the lower side and the water drain channel portion  8  is arranged on the upper side of the control valve  1 , i.e., on one side of the spindle  11 . The first through-flow channel  30  extends at an angle in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is arranged at an angle in relation to the water drain channel portion  8 . 
       FIG. 10P  shows a sixteenth embodiment of the control valve  1  according to the invention, in which the water drain channel portion is arranged at an angle in relation to the water supply channel portion. The water supply channel portion  6  is arranged on one side and the water drain channel portion  8  is arranged on the upper side of the control valve  1 , i.e., on one side of the spindle  11 . The first through-flow channel  30  extends coaxially in relation to the water supply channel portion  6  and adjoins the inflow bore  28  perpendicularly. The second through-flow channel  34  is arranged at an angle in relation to the water drain channel portion  8 . 
       FIG. 11  shows a schematic illustration of a top view of 12 selected embodiments of the control valve  1  according to the invention. All 12 embodiments shown correspond to those which are shown in  FIG. 10 . Therefore, it is also true here that all 12 embodiments have a fundamentally identical arrangement of the inflow bore  28 , the control channel  7 , and the outflow bore  33 , in that the inflow bore  28  and the control channel  7  are arranged coaxially to one another and to the bore axis  13  of the control valve  1 , while the outflow bore  33  is always arranged perpendicularly to the bore axis  13  and therefore to the spindle  11 . The 12 embodiments shown differ from one another by way of the individual arrangement thereof of the elements water supply channel portion  6 , first through-flow channel  30 , second through-flow channel  34 , and water drain channel portion  8 . In the selection of the 12 embodiments shown, depicting simply mirror-inverted variants was omitted; of course, these mirror-image variants are also within the scope of the present invention. The water supply channel portion  6  is marked in each case with an arrow facing toward the control valve  1  or with a large empty circle. The water drain channel portion  8  is marked in each case with an arrow facing away from the control valve  1  or with a small empty circle. The bore axis  13  is marked in each case with a black dot. 
       FIG. 11A  shows the first embodiment of the control valve  1  according to the invention corresponding to the illustration in  FIGS. 1 to 9 . The water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13  and coaxially on both sides of the bore  12  on the housing  3  (cf.  FIG. 10A ). Moreover, the second and fourth embodiments are also shown here, in which the water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane common with the bore axis  13  and axially parallel on both sides of the bore  12  on the housing  3  (cf.  FIGS. 10B, 10D ). 
       FIG. 11B  shows a first variant of the first, second, or fourth embodiment of the control valve  1  according to the invention (cf.  FIGS. 10A, 10B, 10D ), in which the water drain channel portion  8  and the water supply channel portion  6  are arranged in two planes  36 ,  36 ′, which intersect in the bore axis  13 , and angled counterclockwise. 
       FIG. 11C  shows a second variant of the first, second, or fourth embodiment of the control valve  1  according to the invention (cf.  FIG. 10A, 10B , or  10 D), in which the water drain channel portion  8  and the water supply channel portion  6  are arranged in two planes  36 ,  36 ′, which intersect in the bore axis  13 , and angled clockwise. 
       FIG. 11D  shows the seventh embodiment of the control valve  1  according to the invention corresponding to the illustration in  FIG. 10G . The water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13  and axially parallel or coaxially on one side of the bore  12  on the housing  3 . 
       FIG. 11E  shows the third or fifth embodiment of the control valve  1  according to the invention corresponding to the illustration in  FIG. 10C or 10E , respectively. The water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13  and angled on both sides of the bore  12  on the housing  3 . 
       FIG. 11F  shows the sixth embodiment of the control valve  1  according to the invention corresponding to the illustration in  FIG. 10F . The water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13  and angled to one another and coaxially to or on one side of the bore  12  on the lower side or upper side of the housing  3 . 
       FIG. 11G  shows the eighth embodiment of the control valve  1  according to the invention corresponding to the illustration in  FIG. 10H . The water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13  and angled to one another and on one side of the bore  12  on the housing  3 . 
       FIG. 11H  shows the fifteenth embodiment of the control valve  1  according to the invention corresponding to the illustration in  FIG. 10O . The water supply channel portion  6  and the water drain channel portion  8  are arranged coaxially to one another in a plane  35  common with the bore axis  13  and on one side of the bore  12  on the housing  3 . 
       FIG. 11I  shows the eleventh and twelfth embodiments of the control valve  1  according to the invention corresponding to the illustration in  FIGS. 10K and 10L . The water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13 , axially parallel to one another and coaxially to or on one side of the bore  12  on the housing  3 . 
       FIG. 11J  shows the ninth and thirteenth embodiments of the control valve  1  according to the invention corresponding to the illustration in  FIGS. 10I and 10M . The water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13 , axially parallel to one another, and on both sides of the bore  12  on the housing  3 . 
       FIG. 11K  shows the tenth and fourteenth embodiments of the control valve  1  according to the invention corresponding to the illustration in  FIGS. 10J and 10N . The water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13 , angled to one another, and on both sides of the bore  12  on the housing  3 . 
       FIG. 11L  shows the sixteenth embodiment of the control valve  1  according to the invention corresponding to the illustration in  FIG. 10P . The water supply channel portion  6  and the water drain channel portion  8  are arranged in a plane  35  common with the bore axis  13 , angled to one another, and on one side of the bore  12  on the housing  3 . 
     Combinations of the embodiments shown and/or described of the control valve  1  according to the invention are within the scope of the present invention, even if they are not described in detail. The same reference signs indicate corresponding elements, even if they have not been described in detail in each case. 
     The control valve  1  according to the invention can be used in manifold ways; in particular, the embodiments according to  FIGS. 10A and 10O  are suitable for installation in a straight line, whether this is a sanitary line  2 , a heating line  2 ′, or a cooling line  2 ″. When suitably positioned, all other embodiments of the control valve  1  according to the invention are also suitable for installation in a sanitary line  2 , a heating line  2 ′, or a cooling line  2 ″. Accordingly, a sanitary installation having at least one sanitary line  2 , a heating installation having at least one heating line  2 ′, and also a cooling installation having at least one cooling line  2 ″ can each comprise at least one control valve  1  according to the invention. 
     The embodiments according to  FIGS. 10C, 10E, 10F, 10H, 10J, 10N, and 10P  are especially suitable as angled valves having a common plane  35 ; thereof, the embodiments according to  FIGS. 10F, 10H, and 10P  are especially preferred because of the compact construction thereof. It is to be expressly noted here that practically all disclosed embodiments of the control valve  1  according to the invention (cf.  FIG. 10 ) are suitable for use as angle valves, if they are embodied, according to the variants corresponding to  FIG. 11B or 11C , as angle valves having two intersecting planes  36 ,  36 ′. 
     LIST OF REFERENCE NUMERALS 
     
         
           1  valve, control valve 
           2  sanitary line 
           2 ′ heating line 
           2 ″ cooling line 
           3  housing 
           4  housing lower part 
           5  housing upper part 
           6  water supply channel portion 
           7  control channel 
           8  water drain channel portion 
           9  valve upper part 
           10  headpiece of  9   
           11  spindle of  9   
           12  housing bore, bore in  3   
           13  bore axis of  12   
           14  headpiece bore 
           15  wall of  10 , headpiece wall 
           16  stator disk, first valve disk 
           17  through-flow opening of  16   
           18  first ceramic surface of  16   
           19  rotor disk, second valve disk 
           20  through-flow opening of  19   
           21  second ceramic surface of  19   
           22  electrical drive 
           23  first circumferential seal of  10   
           24  surface of  12   
           25  second circumferential seal of  11   
           26  inner surface of  14   
           27  window 
           28  inflow bore 
           29  shoulder 
           30  first through-flow channel 
           31  terminal opening of  15   
           32  ring seal 
           33  outflow bore 
           34  second through-flow channel 
           35  common plane 
           36 ,  36 ′ intersecting planes 
           37  transmission 
           38  stepping motor, drive motor 
           39  emergency power source 
           40  temperature sensor 
           41  temperature regulating unit 
           42  flow sensor 
           43  flow rate regulating unit 
           44  printed circuit board 
           45  cover 
           46  selection wheel of  41   
           47  scale of  41   
           48  directional cam of  16   
           49  seat 
           50  web of  49   
           50 ′ region between two webs  50   
           51  groove for  48   
           52  tension relief element