Unit for a single-lever mixing valve

Details Unit for a single-lever mixing valve Unit for a single-lever mixing valve

1994-07-18

1996-02-13

Rivell, John

Fluid handling

Systems

Multi-way valve unit

1376254, 1376363, 251127, 251285, 251288, F16K 1118

Patent

active

054905400

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a unit for a single-lever mixing valve having a fixed housing, an inner sleeve disposed within the housing, a cage which is rotatable and radially displaceable relative to the housing, a spindle which is swivel-mounted obliquely inside the inner sleeve, engages in the cage and is actuated externally, and with superposed washers having openings, of which one is desired as an inlet valve and attached to the housing and another is designed as a distributor valve and attached to the cage, while yet another is fitted as a shim between the inlet valve and the distributor valve.
Units for single-lever mixing valves of the abovementioned type are known from DE 28 27 236 A1, DE 29 29 199 A1. With these known units the shim can rotate together with the inner sleeve relative to the inlet valve. The distributor valve can rotate radially relative to the shim. Mixing of clod and warm water into mixed water occurs between inlet and distributor valves, while opening and closing of the valve occurs between shim and distributor valve. In the known units there is the risk of so-called spillage: if only a small amount of mixed water is removed, the openings--not exhibiting separate inlet ducts inside the same washer--between shim and distributor valve are extensively closed and if the temperature of the mixed water is selected such that the openings between inlet valve and shim are extensively opened, there may be resulting mixed water reflux in the lower-pressure water feed pipe. Spillage can be overcome by incorporation of reflux valves in the feed pipes. This is, however, not a justifiable expense.


SUMMARY OF THE INVENTION

This is where the present invention is of assistance. The object of the present invention is to provide a unit for a single-lever mixing valve of the type initially described such that there is no spillage. This task is solved according to the present invention by the shim being used as a volume valve which can be radially displaced on the inlet valve relative to the cage, and by the distributor valve being used as a temperature valve which is rotatable with the cage relative to the volume valve and which together with the volume valve is rotatable and radially displaceable relative to the inlet valve.
In the present invention the inner sleeve is disposed permanently in the housing. Relative thereto the spindle is turned and swivelled and the cage is moved rotationally and translationally. The separate inlet ducts of the washers prevent spillage without reflux valves being present in the feed pipes. The maximum angle of rotation between distributor valve/shim and inlet valve is adjustable, thus enabling the choice of a temperature limit. This also makes for a slimmer construction offering the same volume flow. Better design possibilities present themselves for a housing accommodating the unit. There is also a saving on materials.
An embodiment of the invention is illustrated in the diagram and is described hereinafter in detail. In twice-enlarged representation:


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an axial section through a unit for a single-lever mixing valve in the assembled state;
FIGS. 2 and 3 show two axial sections of the housing rotated towards each other at 90.degree.;
FIG. 4 is a cross-section taken along section line 4--4 from FIG. 2;
FIG. 5 is a cross-section taken along section line 5--5 from FIG. 3;
FIG. 6 is a bottom view of the housing;
FIGS. 7-9 are a front elevation, the left side elevation, each half in axial section, and a plan view of an inner sleeve of the unit, respectively;
FIGS. 10-12 show a spindle for the unit in front elevation, bottom view and plan view, respectively;
FIGS. 13-14 show a cast component set in to the housing on the spindle side, preferably of a synthetic material, in side elevation, in partial axial section and in plan view, respectively;
FIGS. 15-18 show the components of a temperature limiter pluggable on the spindle in side elevation, in partial axial section and in bottom view;
FI

REFERENCES:
patent: 2050273 (1936-08-01), Chamberlin
patent: 2238916 (1941-04-01), Powers
patent: 2949923 (1960-08-01), Clerc
patent: 3130750 (1964-04-01), Post
patent: 3506036 (1970-07-01), Hare
patent: 3623510 (1971-11-01), Hare
patent: 3678961 (1972-07-01), Grosche
patent: 3823742 (1974-07-01), Van Corpon
patent: 3987819 (1976-10-01), Scheuermann

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