Shower head having an overpressure valve

Abstract

A shower head, illustratively for a sanitary shower, including a shower head housing, a fluid inlet into the shower head housing, a shower jet outlet out of the shower head housing, a fluid duct within the shower head housing from the fluid inlet to the shower jet outlet, and an overpressure valve pressure-coupled to the fluid duct, including a movable valve body which, in case of an overpressure in the fluid duct, moves from a normal position to an overpressure position. The valve body is illustratively configured to be self-retaining in the overpressure position and returnable to the normal position by user operation, and/or the valve body acts position-dependent on a passage cross-section of the fluid duct, wherein the valve body reduces the passage cross-section in the overpressure position relative to the normal position.

Claims

1. A shower head comprising: a shower head housing; a fluid inlet into the shower head housing; a shower jet outlet of the shower head housing; a fluid duct within the shower head housing from the fluid inlet to the shower jet outlet wherein, during use of the shower head under normal showering operation of the shower head, the fluid pressure in the fluid duct falls within a normal operating pressure range; and an overpressure valve pressure-coupled to the fluid duct, including a movable valve body which, in case of an overpressure state within the fluid duct wherein the fluid pressure in the fluid duct is higher than the normal operating pressure range, moves the valve body from a normal position to an overpressure position; wherein the valve body is configured to be self-retaining in the overpressure position, so as to remain in the overpressure position when the overpressure state is no longer present, and returnable to the normal position by user operation.

2. The shower head according to claim 1, wherein: the shower jet outlet comprises a plurality of jet outlet openings; and the valve body acts on the passage cross-section of the fluid duct between the fluid inlet and the manifold chamber.

3. The shower head according to claim 1, wherein: the valve body is cylindrical and movable within the shower head housing in an axial direction and comprises a radially protruding annular collar including at least one valve passage opening; and the fluid duct comprises a valve chamber in which the valve body with its annular collar is guided for axial movement, at least one valve inlet opening leading into the valve chamber, and at least one valve outlet opening leading out of the valve chamber; wherein the valve body with its annular collar reduces a passage cross-section of the at least one valve passage opening in the overpressure position relative to the normal position.

4. The shower head according to claim 3, wherein in that the at least one valve inlet opening extends axially and the at least one valve passage opening extends axially and in the normal position of the valve body in alignment to the at least one valve inlet opening.

5. The shower head according to claim 3, wherein the overpressure valve comprises a hollow cylindrical valve seat body on which the valve body is held guided and in which the valve chamber is located, wherein the at least one valve outlet opening extends with radial directional component outwards through a cylinder surface section of the valve seat body.

6. The shower head according to claim 1, further comprising a jet disk forming the shower jet outlet, wherein the valve body is located on a same side of the shower head housing as the jet disk.

7. The shower head according to claim 6, wherein the valve body in the overpressure position projects beyond an exterior side of the jet disk and in the normal position does not project beyond the exterior side of the jet disk.

8. The shower head according to claim 1, wherein the over pressure valve has a magnet arrangement which retains the valve body in the normal position by a magnetic force overridable by an overpressure in the fluid duct, wherein the magnetic force decreases in strength with increasing distance of the valve body from the normal position down to an irrelevance value in the overpressure position.

9. A shower head comprising: a shower head housing; a fluid inlet into the shower head housing; a shower jet outlet out of the shower head housing; a fluid duct within the shower head housing from the fluid inlet to the shower jet outlet wherein, during use of the shower head under normal showering operation of the shower head, the fluid pressure in the fluid duct falls within a normal operating pressure range; and an overpressure valve pressure-coupled to the fluid duct, including a movable valve body which, in case of an overpressure state within the fluid duct wherein the fluid pressure in the fluid duct is higher than the normal operating pressure range, moves the valve body from a normal position to an overpressure position; wherein the valve body acts position-dependent on a passage cross-section of the fluid duct through which fluid passes during use of the shower head under normal showering operation of the shower head, wherein the valve body reduces the passage cross-section in the overpressure position relative to the normal position so as to reduce a volume flow of fluid passed through the shower head.

10. The shower head according to claim 9, wherein: the shower jet outlet comprises a plurality of jet outlet openings; the fluid duct comprises a manifold chamber upstream of the jet outlet openings; and the valve body acts on the passage cross-section of the fluid duct between the fluid inlet and the manifold chamber.

11. The shower head according to claim 9, wherein: the valve body is cylindrical and movable within the shower head housing in an axial direction and comprises a radially protruding annular collar including at least one valve passage opening; and the fluid duct comprises a valve chamber in which the valve body with its annular collar is guided for axial movement, at least one valve inlet opening leading into the valve chamber, and at least one valve outlet opening leading out of the valve chamber; wherein the valve body with its annular collar reduces a passage cross-section of the at least one valve passage opening in the overpressure position relative to the normal position.

12. The shower head according to claim 11, wherein in that the at least one valve inlet opening extends axially and the at least one valve passage opening extends axially and in the normal position of the valve body in alignment to the at least one valve inlet opening.

13. The shower head according to claim 11, wherein the overpressure valve comprises a hollow cylindrical valve seat body on which the valve body is held guided and in which the valve chamber is located, wherein the at least one valve outlet opening extends with radial directional component outwards through a cylinder surface section of the valve seat body.

14. The shower head according to claim 9, further comprising a jet disk forming the shower jet outlet, wherein the valve body is located on a same side of the shower head housing as the jet disk.

15. The shower head according to claim 14, wherein the valve body in the overpressure position projects beyond an exterior side of the j et disk and in the normal position does not project beyond the exterior side of the jet disk.

16. The shower head according to claim 9, wherein the overpressure valve has a magnet arrangement which retains the valve body in the normal position by a magnetic force overridable by an overpressure in the fluid duct, wherein the magnetic force decreases in strength with increasing distance of the valve body from the normal position down to an irrelevance value in the overpressure position.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Advantageous embodiments of the invention are illustrated in the drawings and described below, wherein further advantageous embodiments according to the invention are mentioned and explained in addition. In the drawings:

(2) FIG. 1 shows a longitudinal section through a shower head;

(3) FIG. 2 shows a detail longitudinal section through a central region of the shower head in FIG. 1;

(4) FIG. 3 shows a longitudinal section through an overpressure valve having a valve body in the normal position, it being possible to use the overpressure valve in the shower head in FIG. 1;

(5) FIG. 4 shows a perspective view of the overpressure valve in FIG. 3;

(6) FIG. 5 shows a detail view of a region V in FIG. 3;

(7) FIG. 6 shows the view in FIG. 3 with the valve body in the overpressure position; and

(8) FIG. 7 shows a side view of the overpressure valve in the overpressure position as per FIG. 6.

DETAILED DESCRIPTION OF THE DRAWINGS

(9) The embodiments of the invention described herein are not intended to be exhaustive or to limit the invention to precise forms disclosed. Rather, the embodiments selected for description have been chosen to enable one skilled in the art to practice the invention.

(10) The shower head shown in FIGS. 1 and 2 comprises a shower head housing 1, a fluid inlet 2 into the shower head housing 1, a shower jet outlet 3 out of the shower head housing 1, a fluid duct 4 within the shower head housing from the fluid inlet 2 to the shower jet outlet 3, and an overpressure valve 5. The overpressure valve 5 is pressure-coupled to the fluid duct 4, i.e. a fluid pressure prevailing in the fluid duct 4 in a corresponding region, to which the overpressure valve 5 is operatively coupled, acts on the overpressure valve 5. The overpressure valve 5 installed in the shower head shown in FIGS. 1 and 2 is illustrated in greater detail in FIGS. 3 to 7. It is self-evident that this overpressure valve can also be used in other shower heads.

(11) The overpressure valve 5 includes a movable valve body 6 which, in case of an overpressure within the fluid duct 4, moves from a normal position N.sub.S, shown in FIGS. 3 to 5, to an overpressure position U.sub.S, shown in FIGS. 6 and 7 and in the installed state of FIGS. 1 and 2.

(12) In corresponding embodiments of the invention, the valve body 6 is configured to be self-retaining in the overpressure position U.sub.S and returnable to the normal position N.sub.S by user operation. This means that, when the valve body 5 has adopted its overpressure position owing to an overpressure in the fluid duct 4, the valve body 5 remains in the overpressure position U.sub.S until the user moves it back into the normal position N.sub.S, even if the overpressure is in the meantime no longer present in the fluid duct 4.

(13) In the illustrative embodiment shown, the overpressure valve 5 has a magnet arrangement 7 for this purpose, the magnet arrangement 7 retaining the valve body 6 in the normal position N.sub.S by a magnetic force F.sub.M overridable by an overpressure in the fluid duct 4, wherein the magnetic force F.sub.M decreases in strength with increasing distance of the valve body 6 from the normal position N.sub.S down to an irrelevance value in the overpressure position U.sub.S. In alternative embodiments, the overpressure valve includes some other conventional source of a retaining force instead of a magnet arrangement of this kind, the source subjecting the valve body in the normal position N.sub.S to a retaining force that can be overridden by the overpressure in the fluid duct 4 and that no longer acts on the valve body 6 in the overpressure position U.sub.S or, at least, is no longer sufficiently strong to be able to move the valve body 6 back into the normal position N.sub.S itself when the overpressure is no longer present.

(14) In the illustrative embodiment shown, the magnet arrangement 7 is formed by two interacting magnets 7a, 7b, of which a first magnet 7b is arranged in the or on the valve body 6 and a second magnet 7a is arranged in or on a part of the overpressure valve 5 which remains stationary. The two magnets 7a, 7b can be permanent magnets, for example, and can provide the magnetic force F.sub.M as a magnetic force of attraction between the two magnets 7a, 7b, which, as is conventional, decreases rapidly in strength with increasing distance between the two magnets 7a, 7b. The magnets 7a, 7b are suitably chosen to ensure that, in the normal position N.sub.S of the valve body 6, in which they are the shortest distance apart, they provide the magnetic force F.sub.M with the strength required to hold the valve body 6 in its normal position N.sub.S, while, in the overpressure position U.sub.S of the valve body 6, in which the two magnets 7a, 7b are at the furthest distance apart, the magnetic force F.sub.M has fallen virtually to zero or, at any rate, to an extent sufficient to ensure that it is no longer capable of moving the valve body 6 back into the normal position N.sub.S against any frictional forces and any fluid pressure forces that may be present.

(15) In corresponding embodiments of the invention, the valve body 6 acts in a position-dependent manner on a passage cross-section D.sub.Q of the fluid duct 4, such that it reduces the passage cross-section D.sub.Q in the overpressure position U.sub.S relative to the normal position N.sub.S.

(16) In the illustrative embodiment shown, the valve body 6 is cylindrical and movable within the shower head housing 1 in axial direction A.sub.R, wherein, as is conventional, axial direction A.sub.R should be taken to mean the direction parallel to a longitudinal central axis of the cylindrical valve body 6, and the direction opposite thereto. The valve body 6 comprises a radially protruding annular collar 8 including at least one valve passage opening 9. The fluid duct 4 comprises a valve chamber 10 in which the valve body 6 with its annular collar 8 is guided for axial movement. The fluid duct 4 furthermore has at least one valve inlet opening 11 leading into the valve chamber 10, and at least one valve outlet opening 12 leading out of the valve chamber 10. The valve body 6 with its annular collar 8 reduces the passage cross-section D.sub.Q of the at least one valve outlet opening 12 when the valve body 6 is in the overpressure position U.sub.S relative to the operating state when the valve body 6 is in the normal position N.sub.S. In other words, the valve body 6 reduces the passage cross-section D.sub.Q of the fluid duct 4 in the region of the at least one valve outlet opening 12 in the example shown. In alternative embodiments, the valve body acts at a different point of the fluid duct 4 on the passage cross-section D.sub.Q of the latter in such a way as to make it smaller when an overpressure occurs. The reduction in size can consist in that the passage cross-section D.sub.Q is completely shut off, i.e. reduced to zero, or, alternatively, to some other desired, reduced cross-sectional value between the value zero and a maximum value which the passage cross-section D.sub.Q has at the relevant point of the fluid duct 4 when the valve body 6 is in the overpressure position U.sub.S.

(17) The valve chamber 10, the at least one valve inlet opening 11 and the at least one valve outlet opening 12 can all be formed on the overpressure valve 5, for example. In the example shown, the valve chamber 10 is in the form of an annular cylinder but, alternatively, it can have some other form, e.g. the form of a full cylinder. In corresponding embodiments, a plurality of valve inlet openings 11 and valve passage openings 9 is provided in each case, the openings being arranged equidistantly in the circumferential direction in each case, for example.

(18) In corresponding embodiments, both the at least one valve inlet opening 11 and the at least one valve passage opening 9 extend purely axially, i.e. parallel to the axial direction A.sub.R, wherein the at least one valve passage opening 9 extends axially in alignment with the at least one valve inlet opening 11 when the valve body 6 is in the normal position N.sub.S. In alternative embodiments, the at least one valve inlet opening and/or the at least one valve passage opening extends at least partially obliquely or perpendicularly to the axial direction A.sub.R. The flush transition from the respective valve inlet opening 11 to the respective valve passage opening 9 enables the fluid to enter the valve chamber 10 unhindered via the at least one valve inlet opening 11, through the at least one valve passage opening 9, in the normal position N.sub.S of the valve body 6.

(19) In the example shown, the respective valve passage opening 9 of the valve body 6 lies opposite, with no clearance or at most a small clearance, the respective valve inlet opening 11 in an associated front end region of the valve chamber 10 in the normal position N.sub.S. In the overpressure state U.sub.S, the annular collar 8 of the valve body 6 is in the other front end region of the valve chamber 10 and consequently at a significant distance from the valve inlet opening or openings 11, and therefore the one or more valve inlet openings 11 are not shut off by the valve body 6, even in the case of overpressure.

(20) In corresponding embodiments, the overpressure valve 5 comprises a hollow cylindrical valve seat body 13 on which the valve body 6 is held guided and in which the valve chamber 10 is located. In this case, the at least one valve outlet opening 12 extends with a radial directional component outwards through a cylinder surface section 13a of the valve seat body 13.

(21) In the example shown, the valve seat body 13 is manufactured from a plurality of assembled parts while, in alternative embodiments, it is manufactured in one piece. In the example shown, it is provided in one front end region with an external thread 14, by means of which it can be screwed into an internal thread of a joint sleeve 15 of the shower head 1, as shown. In the example shown, the valve seat body 13 furthermore has, in an axially central region, an external thread 16, to which a shower outlet part 1a of the shower head housing 1 is screwed. In alternative embodiments, the valve seat body 13 can be connected to the shower head housing in some other conventional manner.

(22) In the example shown, the shower outlet part 1a is manufactured with a flat shower construction, thereby making the shower head in FIGS. 1 and 2 suitable particularly as a flat overhead shower of the kind known for use in sanitary shower rooms or shower installations. The shower outlet part 1a is coupled in an articulated manner, by means of a ball joint 16, to a shower head connection part 1b, via which the shower head can be connected to a fluid supply and which forms the fluid inlet 2. In alternative embodiments, the shower head is not configured in this flat construction but is of some other conventional design, e.g. a bell-shaped design. As shown, a screen element 17 is optionally arranged as a dirt/particle screen in the fluid duct section of the shower head connection part 1b between the fluid inlet 2 and the at least one valve inlet opening 11.

(23) Apart from the overpressure valve 5, the shower outlet part 1a has a construction that is known per se, which ends on the fluid outlet side with a jet disk 18, which forms the shower jet outlet 3 and is provided with one or, usually, a multiplicity of jet outlet openings 19, which are arranged in a pre-determinable configuration over an outlet surface, e.g. a circular or rectangular surface, of the jet disk 18.

(24) In corresponding embodiments, as in the example shown, the fluid duct 4 comprises a manifold chamber 20 upstream of the jet outlet openings 19, from which manifold chamber the jet outlet openings 19 lead and into which the at least one valve outlet opening 12 leads. In this shower head, the valve body 6 thus acts on the passage cross-section D.sub.Q of the fluid duct 4 between the fluid inlet 2 and the manifold chamber 20, in this case specifically between the valve chamber 10 and the manifold chamber 20.

(25) In corresponding embodiments, the valve body 6 is located on a same side of the shower head housing 1 as the jet disk 18 forming the shower jet outlet 3. In the illustrative embodiment shown, the valve body 6 is located specifically in a central region of the jet disk 18. In alternative embodiments, the valve body 6 is arranged eccentrically with respect to the jet disk 18.

(26) In corresponding embodiments, the valve body 6 in the overpressure position N.sub.S projects beyond the exterior side of the jet disk 18. The shower head is shown in this state in FIGS. 1 and 2. In the normal position N.sub.S, the valve body 6 does not project beyond the exterior side of the jet disk 18, i.e. it is positioned set back relative thereto within the shower head housing 1 or ends substantially flush with the exterior side of the jet disk 18. The latter case is implemented in the example shown, i.e. in the normal position N.sub.S an exterior side 6a of the valve body 6 is flush with an exterior side 13b of the valve seat body 13, which, for its part, ends substantially flush with the exterior side of the jet disk 18.

(27) As can be seen especially from FIG. 5, a central pin 13c is formed on the valve seat body 13 in the illustrative embodiment shown, the pin 13c delimiting the annular valve chamber 10 radially on the inside and being capable of acting as an additional aid for the guidance of the valve body 6, for which purpose the valve body 6 is of correspondingly hollow cylindrical design in an associated section 6c axially between its annular collar 8 on the foot side and a head section 6b ending with the exterior side 6a. A pressure duct 21 is formed between this hollow cylindrical section 6c of the valve body 6 and the central pin 13c of the valve seat body 13, the duct 21 being in fluid communication with the valve chamber 10 and leading axially forwards as far as an end face 22 of the valve body head section 6b.

(28) In corresponding embodiments, the pressure duct 21 comprises one or more radial gaps extending axially or with an axial directional component, it being possible, for example, for each of the gaps to be formed by a groove extending axially or with an axial directional component on the outside of the central pin 13c and/or on the inside of the hollow cylindrical valve body section 6c. As an alternative, an annular gap which is continuous in the circumferential direction can be provided as a pressure duct 21, or spacing webs extending axially or with an axial directional component can be provided on at least one of these two opposite surfaces, between which webs the interspaces forming the pressure duct 21 are then present.

(29) In the illustrative embodiment shown, the central pin 13c serves simultaneously to retain the second magnet 7a, while the first magnet 7b is arranged in the head section 6b of the valve body 6. The magnets 7a, 7b can there be fitted into corresponding holes which can, by way of example, be closed by means of a sealing screw 23 on the part of the central pin 13c and by means of a covering cap 24 defining the exterior side 6a of the valve body 6 on the part of the valve body 6. As an alternative, these magnet insertion holes can remain unclosed or can be closed in some other way.

(30) In the illustrative embodiment shown, the respective valve outlet opening 12 leads out of the valve chamber 10, in a region of the chamber 10 which is at the bottom in the figures, and extends radially outwards and axially forwards or outwards, i.e. downwards in the figures, through the relevant cylinder surface section 13a of the valve seat body 13, which can be of conically tapered configuration in this region, for example, as shown. In the example shown, a plurality of valve outlet openings 12 is provided in a manner distributed equidistantly in the circumferential direction. The number of valve outlet openings 12 can correspond to the number of valve passage openings 9 or differ therefrom.

(31) In the normal state N.sub.S, the annular collar 8 of the valve body 6 is situated in the inner or rear end region of the valve chamber 10, i.e. that at the top in the figures, wherein the respective valve passage opening 9 is in alignment opposite the associated valve inlet opening 11 and opens into this region of the pressure duct 21. The valve outlet openings 12 are fully exposed without the valve body 6 restricting the passage cross-section D.sub.Q of the fluid duct 4, which is determined by the overall configuration of the shower head. Fluid supplied via the fluid inlet 2 consequently reaches the shower jet outlet 3 via the fluid duct 4 in this normal mode of the shower head, and emerges from there as a corresponding shower jet. To be more precise, during this process the fluid flows via the valve inlet openings 11 and the valve passage openings 9 into the valve chamber 10 and, from there, via the valve outlet openings 12 into the manifold chamber 20, from where it is distributed between the jet outlet openings 19.

(32) As long as the fluid can flow substantially without hindrance and in a trouble-free manner, no overpressure occurs in the fluid duct 4. Since the pressure duct 21 is not located in the main flow of the fluid duct 4, it is not subject to any significant fluid pressure during the normal operation of the shower head and, in all cases, any fluid pressure force thereby possibly exerted on the valve body 6, on the end face 22 of its head section 6b, in an outward direction or downwards in the figures remains lower than the opposing attractive magnetic force F.sub.M of the two magnets 7a, 7b. Particularly after a relatively long period of operation of the shower head, relatively small particles and/or lime scale deposits can lead to constriction or blockages in the fluid duct 4 and particularly in the region of the shower jet outlet 3. This applies particularly to shower heads in which the jet outlet openings 19 have only relatively small passage cross-sections, as is the case, for example, with sanitary showers which release what is referred to as a fine or needle jet as a shower jet. As a result, an overpressure may occur in the fluid duct 4, i.e. a raised fluid pressure which is too high, higher than the fluid pressure in the normal shower mode, including normal pressure fluctuations, e.g. those caused by fluctuating pressure conditions in an upstream fluid supply. Such an overpressure is unwanted and can cause damage in the shower head housing 1. This is prevented by the overpressure valve 5.

(33) If an overpressure occurs in the fluid duct 4, e.g. in the manifold chamber 20, this leads to a corresponding overpressure in the valve chamber 10 of the overpressure valve 5 pressure-coupled to the fluid duct 4. The overpressure in the valve chamber 10 also forces the fluid into the pressure duct 21, as a result of which the fluid presses with the corresponding overpressure against the end face 22 of the valve body 6. The magnet arrangement 7 is configured in such a way that the magnetic force F.sub.M provided by it in the normal position N.sub.S of the valve body 6 is lower than the oppositely acting fluid overpressure force which is exerted by the fluid under overpressure on the valve body 6, on the end face 22 thereof. As a result, the valve body 6 is released from its normal position N.sub.S, counter to the magnetic force F.sub.M, and, following the fluid overpressure force, moves axially forwards or outwards, i.e. downwards in the figures, as far as its overpressure position U.sub.S, which represents the end position of the valve body 6 opposite to the normal position N.sub.S. Given appropriate system design, this extension movement of the valve body 6 counter to the magnetic force F.sub.M and counter to any frictional forces and counter to the ambient pressure acting on the exterior side 6a of the valve body 6 can additionally be supported by an entrainment effect of a residual flow of fluid in the valve chamber 10. It is self-evident that the overpressure valve 5 responds also when the shower head is connected to a fluid supply, the fluid supply pressure of which is higher than that for which the shower head is designed.

(34) In the overpressure position U.sub.S, the annular collar 8 of the valve body 6 blocks the respective valve outlet opening 12 completely or, alternatively, partially, as can be seen, for example, in FIGS. 2 and 5. In this overpressure position U.sub.S, the valve body 6 thereby reduces the passage cross-section D.sub.Q of the fluid duct 4 at this point to zero or, at least, to a value lower than the effective passage cross-section of the fluid duct 4 during normal operation. This has the effect that the volume flow of the fluid at the shower outlet 3 is greatly reduced in corresponding fashion. For the user, this can be detected easily from the fact that the shower jet stops or that the shower head then only drips at the shower outlet 3. Moreover, the user can detect the case of overpressure which has occurred from the fact that the valve body 6 has moved into its extended overpressure position U.sub.S and therefore projects forwards or outwards beyond the exterior side of the jet disk 18. As an option, the valve body 6 can be produced in such a way that its color is set off from the surrounding jet disk region, at least in its region projecting beyond the jet disk 18. This can make it even easier for the user to detect the fact that the overpressure valve 5 has responded.

(35) Owing to the at least partial blockage of the valve outlet opening or openings 12, the fluid can no longer flow into the manifold chamber 20, or can no longer flow into it in a significant quantity, in the overpressure position U.sub.S of the valve body 6, and therefore overpressure which is initially present there can dissipate through the escape of the remaining fluid at the shower outlet 3. The user can then take the required measures, e.g. that of cleaning the shower head as a whole or at least at the shower outlet 3, i.e. can remove the cause of the case of overpressure which has occurred. During this process, the valve body 6 initially remains in its overpressure position U.sub.S since the two magnets 7a, 7b are now so far apart that they no longer exert any, or at least no significant, magnetic force on the valve body 6, i.e. the magnet arrangement 7 is not capable of automatically pulling the valve body 6 back into the normal position N.sub.S. Once the user has removed the cause of the fluid overpressure, they push the valve body 6 back into its normal position N.sub.S, e.g. by pressing with one finger against the exterior side 6a of the valve body 6. In other words, the head section 6b of the valve body 6 in the example shown forms, as it were, a valve pin which the user can push back into the retracted normal position N.sub.S from the extended overpressure position U.sub.S.

(36) The magnetic force F.sub.M of the magnet arrangement 7 then once again holds the valve body 6 in its normal position N.sub.S. In the normal position N.sub.S, the valve body 6 once again completely exposes the passage cross-section D.sub.Q of the fluid duct 4, in the example shown by completely exposing the valve outlet openings 12. The shower head is thus once again ready for use.

(37) As the illustrative embodiments shown and mentioned above make clear, the invention makes available a shower head with an advantageous overpressure valve function. Damage to the shower head can be avoided by means of the integrated overpressure valve. In corresponding implementations of the shower head, the overpressure valve can ensure a reduction in the fluid volume flow, thus enabling the overpressure to dissipate through the escape of residual fluid from the shower head, preferably via the shower jet outlet, without fluid emerging at the overpressure valve itself. In corresponding implementations of the shower head, the user can easily detect a case of overpressure, remove the causes of the overpressure and then move the valve body back from its overpressure position to its normal position under the user's own control.

(38) It is self-evident that the shower head according to the invention can be used both for any type of sanitary shower and for non-sanitary showers if and to the extent that there is a need to protect the shower head from any fluid overpressure in the fluid duct.

(39) Although the invention has been described in detail with reference to certain preferred embodiments, variations and modifications exist within the spirit and scope of the invention as described and defined in the following claims.