SANITARY FITTING

Abstract

A sanitary fitting, more particularly a thermostatic mixing valve, includes a housing, which has a valve seat for receiving a valve and into which at least one feed channel and a discharge channel open, wherein the at least one feed channel is led through a chamber, into which a backflow preventer is inserted and which is closed by a plug. A retaining frame is provided on the plug, which retaining frame protrudes into the chamber and by which retaining frame the backflow preventer is axially fixed.

Claims

1. A sanitary fitting, in particular a thermostatic mixing fitting, having a housing (1) that has a valve seat (16) for holding a valve, and into which seat at least one feed channel (12, 13) and a discharge channel (14) open, wherein the at least one feed channel (12, 13) is passed through a chamber (15), into which a check valve (2) is introduced, and which is closed off by way of a plug (3), wherein a retaining frame is provided on the plug (3), which frame protrudes into the chamber (15) and by means of which frame the check valve (2) is axially fixed in place.

2. The sanitary fitting according to claim 1, wherein the at least one check valve (2) introduced into a chamber (15) has at least one seal (5), by way of which it is sealed off relative to the chamber (15).

3. The sanitary fitting according to claim 1, wherein the at least one check valve (2) has a movable piston (22), by way of which it can be closed in the backflow direction, wherein a shut-off element (4) is arranged for moving the piston (22) of the check valve (2) into its closed position is provided in the related plug (3).

4. The sanitary fitting according to claim 3, wherein the shut-off element (4) is mounted so that it can move axially in the direction of the piston (22) of the check valve (2) through a bore (34) arranged in the plug (3), and can be fixed in place at least in a position in which it lies against the piston (22) in its closed position.

5. The sanitary fitting according to claim 4, wherein the shut-off element (4) has an outside thread (43), in certain regions, which thread engages into an inside thread (344) of the plug (3), and thereby the shut-off element (4) can be moved axially in the plug (3) by means of rotation.

6. The sanitary fitting according to claim 5, wherein the shut-off element (4) has a head (42) that is preferably enlarged in diameter, which head has the outside thread (43), wherein an engagement location (44) for a turning tool is present in the head (42).

7. The sanitary fitting according to claim 3, wherein the shut-off element (4) has a cylindrical section (41) that lies against a seal (37) through which it passes and by way of which it is sealed off relative to the plug (3).

8. The sanitary fitting according to claim 1, wherein the plug (3) has an outside thread (33), with which it is screwed into an inside thread (154) of a chamber (15).

9. The sanitary fitting according to claim 1, wherein the retaining frame (35) of the plug (3) is configured as a hollow cylinder, and has at least one window (351) for water to pass through.

10. The sanitary fitting according to claim 9, wherein the retaining frame (35) has a holder on its end side, by way of which the check valve (2) is framed.

11. The sanitary fitting according to claim 10, wherein the holder is formed by a ring-shaped step (352).

12. The sanitary fitting according to claim 9, wherein the check valve (2) is arranged, at least in certain regions, preferably in the region of its upper half, which faces the plug (3), at a distance from the wall of the chamber (15), whereby a gap is formed, at least in certain regions, preferably circumferentially, into which gap the holder of the retaining frame (35) engages.

13. The sanitary fitting according to claim 1, wherein a thermostatic valve is introduced into the valve seat (16), wherein a hot water inflow (12) and a cold water inflow (13) open into the valve seat (16), each of them being connected with a water feed channel of the thermostatic valve, forming a seal.

Description

[0017] Other further developments and embodiments of the invention are indicated in the remaining dependent claims. An exemplary embodiment of the invention is shown in the drawings and will be described in detail below. The figures show:

[0018] FIG. 1 the schematic representation of a thermostatic mixing fitting;

[0019] FIG. 2 the schematic representation of a plug of the thermostatic mixing fitting from FIG. 1, with a check valve held by it;

[0020] FIG. 3 the detail representation of the plug of the arrangement from FIG. 2 in longitudinal section;

[0021] FIG. 4 the detail view of the shut-off valve of the arrangement from FIG. 2;

[0022] FIG. 5 the representation of the check valve of the arrangement from FIG. 2 [0023] a) in partial section, and [0024] b) in a top view.

[0025] The thermostatic mixing fitting selected as an exemplary embodiment comprises a housing 1 having a valve seat 16, which holds a thermostatic valve—not shown. Three connection pieces 11 for connection of water lines—not shown—are formed on the housing 1, by means of which a hot water feed channel 12, a cold water feed channel 13 arranged opposite to it, and a discharge channel 14 that runs between them are passed and open into the valve seat 16. In this regard, the hot water feed channel 12 and the cold water feed channel 13 are each connected with an inflow of the thermostatic valve, and the discharge channel 14 is connected with the discharge of the thermostatic valve.

[0026] The hot water feed channel 12 and the cold water feed channel 13 are each passed through a chamber 15 that precedes the valve seat 16, which chamber holds a check valve 2, in each instance. The chambers 15 are arranged axially offset from one another and each structured in the form of a stepped bore, which opens into the corresponding water feed channel 12, 13, in each instance. In the transition to the corresponding water feed channel 12, 13, a step 151 is formed, followed by a first cylindrical section 152, which makes a transition to a second section 153, which is widened in diameter and provided with an inside thread 154 on the end side, which thread is delimited, on the end side, by a chamfer 155 for sealing contact of an 0-ring 37. The first cylindrical section 152 extends to approximately half the height of the check valve 2, which lies against the step 151.

[0027] The check valve 2 comprises, in a usual manner, a cylindrical housing 21, in which a piston 22, provided with a conical piece 221 on its end side, is displaceably guided, and pre-loaded against a seal seat 24 of the housing 21 by way of a pressure spring 23. On the outside, a ring groove 25 for holding an O-ring 26 is introduced into the housing 21. For the remainder, the housing 21 has a smooth mantle surface. No engagement projections or other means for a shape-fit connection with the wall of the chamber 15 are present.

[0028] The plug 3 is essentially formed in cylindrical shape and has a ring-shaped collar 31 approximately in the center on the outside, which collar delimits a circumferential groove 32 that makes a transition into an outside thread 33. A stepped bore 34 is introduced into the plug 3, centered axially. The stepped bore 34 has a first section 341 that is provided with an inside thread 344 on its end facing away from the outside thread 33, and is followed by a second section 342, reduced in diameter, which is provided, in its center, with a ring groove 343 for holding an O-ring 36. The second section 342 extends approximately over the region of the plug 3 that is provided with the outside thread 33. On its side that lies opposite the circumferential groove 32, the collar 31 is delimited by a ring groove 38 for holding an O-ring 39.

[0029] A retaining frame 35 essentially in the form of a hollow cylinder is formed on the plug 3, which frame is provided with two windows 351 arranged to lie opposite one another, for water to pass through. On the end side, a ring-shaped step 352 is formed on the retaining frame 35, by means of which step a holder for the check valve 2 is formed.

[0030] The shut-off element 4 comprises a cylindrical body 41, on which a cylindrical head 42, widened in diameter, is formed on the end side, which head is provided with an outside thread 43. A Phillips tool engagement location 44 is introduced into the head 42. On its end that lies opposite the head 42, a key groove 45 for holding an O-ring 46 is introduced into the cylindrical body 41, followed by a section 47 in the form of a truncated cone, on which a cylindrical connecting piece 48 is formed.

[0031] A check valve 2 is introduced into the two chambers 15 of the housing 1, in each instance, in such a manner that they lie against the step 151 of the chamber 15, wherein its piston 22 is pre-loaded in the direction of the corresponding water feed channel 12, 13, against the seal seat 24. The two chambers 15 are each closed off by way of a plug 3, which is screwed into the inside thread 154 of the chamber 15 with its outside thread 33, wherein the O-ring 37 lies against the chamfer 155 of the chamber 15, forming a seal. In this regard, the retaining frame 35 of each plug 3 lies on the housing 21 of the corresponding check valve 2 that is framed by the ring-shaped step 352, which engages into the gap formed between the check valve 2 and the wall of the first cylindrical section 151 of the corresponding chamber 15. The check valve 2 is thereby securely held between the step 151 of the chamber 15 and the retaining frame 35 of the plug 3. To replace the check valve 2, the plug 3 only has to be removed; subsequently, the valve can simply be taken out and replaced with a new check valve 2.

[0032] The shut-off element 4 is introduced into the stepped bore 34 of the plug 3, wherein the head 42 is screwed into the inside thread 344 of the stepped bore 34 with its outside thread 43. In this regard, the cylindrical body 41 is guided in the second section 342 provided with the O-ring 36, forming a seal, wherein the O-ring 46 arranged in the key groove 45 lies against the plug 3. The shut-off element 4 is moved in the direction of the check valve 2 by turning the shut-off element 4 clockwise, by way of a Phillips screwdriver that engages into the tool engagement location 44 of the head 42, until the connecting piece 47 engages into an engagement location 27 provided in the piston 22 for this purpose.

[0033] By means of further rotation of the shut-off element 4, the piston 22 can be moved against the seal seat 24 with its conical piece 221, and thereby the corresponding water feed channel 12, 13 is closed off, forming a seal. By way of the threaded engagement location of the shut-off element 4, this element can furthermore be used to limit the amount of the corresponding stream of water into the hot water feed channel 12 or the cold water feed channel 13, respectively, in that the piston 22 is not completely set onto the seal seat 24 with its conical piece 221.