DE29610340U1 - Shower diverter for sanitary fittings - Google Patents

Description

Patent Attorney "Ralf !Hing, DipL-Jur., ing. .. .. Marsphnerstrasse 4 a .· : ::.. D 1 0§12Q Chemnitz

D 1 0§ SAF Armaturen GmbH .!·*..* *..**.*'.."..· 9608

South Street 68

04430 Böhlitz-Ehrenberg

Shower diverter for sanitary fittings

The invention relates to a shower diverter for sanitary fittings with ventilation valve.

The DIN regulations require that sanitary fittings be secured against backflow. This type of security is known to be achieved by spring-loaded shower diverters. These are self-retaining when the shower function is switched over via the water pressure. When the water is turned off and in particular when a negative pressure occurs in the system, they enable the water path to the shower to be closed immediately and ventilation to be provided via the outlet. In addition, backflow preventers are installed in the shower outlet or in the fitting connections to protect the sanitary fittings (DE 42 24 684 AD).
The mechanical properties of the reset function deteriorate over time due to the presence of drinking water. This means that they no longer reliably reset when the sanitary fitting is closed. Another defect is the possibility that users can lock the diverter externally in order to prevent the sanitary fitting from resetting when the water pressure is low. This means that the backflow prevention function is no longer functional.

The object of the invention is to create a shower diverter according to the generic term of the main claim, which ensures a high level of intrinsic safety of the sanitary fitting and enables reliable ventilation in the event of negative pressure in the water network.

According to the invention, this problem is solved by the features of the characterizing part of the main claim. The feature of the subclaim forms the solution of the main claim

2 ·

alternative. By arranging the valve in a central hole in the valve tappet of the shower diverter, the ventilation can be guided through the valve tappet either via the outlet or directly from outside the shower diverter. This means that only a few additional parts with a simple geometric shape are required, which cannot be deactivated from the outside and do not require a sealing element with time-dependent friction behavior on the movement path.

This ventilation device can be combined with a backflow preventer in a known manner.

The invention is explained using two exemplary embodiments. The drawing shows

Fig. 1 a cross-section through a shower diverter with ventilation through the outlet and

Fig. 2 a cross-section through a shower diverter with ventilation from outside the shower diverter. ,

A housing 1 of the shower diverter is provided with a channel 2 for the water connection and a channel 3 for the outlet (Fig. 1). Both channels 2;3 end at a valve bore 4, the lower end of which has a nozzle 5 for the shower connection. This nozzle 5 is provided with a conical sealing bevel 6 on the bore face facing the shower diverter. An annular sealing seat 7 is pressed into the valve bore 4 in the web between the two channels 2;3. A threaded bush 8 is pressed into the other web between the channel 3 for the outlet and the outer surface of the housing, and a valve housing 9 is screwed into its internal thread. A valve tappet 11 is slidably mounted in an axial bore 10 of the valve housing 9. It is radially sealed to the outside and has a sealing ring 12 at its free end for switching between the shower connection and the outlet. Just below the outer seal 13, the valve tappet 11 is provided with a further sealing ring 14 on a smaller diameter, which seals the axial bore 10 of the valve housing when switching to the outlet.

ses 9 close to its front side facing into the housing seals off the outlet. The axial bore 10 of the valve housing 9 is designed somewhat larger than the reduced diameter of the valve tappet 11. The valve tappet 11 is provided with a stepped center bore 15 from its free end protruding into the housing 1. The weaker part of the center bore 15 is guided over the sealing ring 14 into the smaller diameter of the valve tappet 11 and there is provided with a transverse bore 16 leading outwards through the valve tappet 11. The transition between the weaker and stronger parts of the center bore 15 is designed as a conical sealing seat 17 on which a disk valve 18 guided in the stronger part of the center bore 16 rests. A compression spring 19 pointing towards the free end of the central bore 15 presses on the poppet valve 18 and is held there by a perforated cover 20. In Fig. 2, the weaker part of the central bore 15 is extended and provided with a cross-bore at its end so that it lies outside the valve housing 9 in the "shower" switching position.

The mode of action is as follows:

In the "shower" switch position of the valve tappet 11, the channel 2 of the water connection is connected to the shower connection. In the event of a negative pressure in the water connection, a suction effect will occur there, which will cause the dirty water to rise when the hand shower is in the tub. The pressure spring 19 of the plate valve 18 is dimensioned so that it opens the plate valve 18 at approx. 10 cm water column. Once the suction has reached such a level, the open plate valve 18 creates a connection to the outlet via the weaker part of the center hole 15, the cross hole 16 and the space between the valve tappet 11 and the axial hole of the valve housing 9. This prevents the dirty water from rising any further. The shower diverter ventilates the water supply line in this way. This mode of operation ensures that the ventilation function cannot be blocked by external intervention. This effectively prevents back-suction.

This solution can be combined with a spring-loaded backflow preventer in the usual way. This provides double protection.

In the "outlet" position of the valve tappet 11, the shower connection is closed. In this position, the sealing ring 14 on the weaker part of the valve tappet 11 also closes the water path via the cross hole 16 to the back of the disk valve 18. This means that no water can flow out via the shower connection.

The solution according to Fig. 2 has the same effect. The air for ventilating the water connection is sucked in directly above the valve housing 9 via the cross hole 21. This design simplifies the shape of the valve tappet 11 and the valve housing 9 and is therefore cheaper to manufacture. When using a suitably designed handle, the center hole 15 can be led to the outer face of the valve tappet 11 and suck in the air there. A cross hole is then not required.

Claims (2)

Protection claims 1. Shower diverter for sanitary fittings with ventilation valve, characterised by that a valve tappet (11) of the shower diverter is provided at its end pointing into the shower outlet with a stepped central bore (15), in the stronger part of which a disk valve (18) is guided, which is pushed by a spring (19) with its valve cone surface against the conical transition (17) between the stronger and weaker part of the central bore (15) can be pressed and that the weaker part of the center bore (15) above an upper switch seal (14) of the valve tappet (11) is provided with a cross bore (16) which creates a connection to the ventilated space of the outlet outlet in the "shower" switching position, in the "outlet" switching position the connection to the space now under flow pressure is interrupted. 2. Shower diverter according to claim 1,
characterized, that the weaker part of the central bore (15) is extended and is provided with a longitudinal or longitudinal and transverse bore (15;16;21) for ventilation outside the shower diverter.