Fluid handling – Systems – Multi-way valve unit
Patent
1995-12-06
1997-03-11
Fox, John C.
Fluid handling
Systems
Multi-way valve unit
13762517, F16K 1106
Patent
active
056091885
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a sanitary mixer tap with with a cold water supply and, symmetrically to a central plane, a second through aperture communicating with a hot water supply; be moved linearly with respect to the fixed control disc for alteration of the amount of water flowing out and twisted for alteration of the temperature and has for this a recess connected to an outlet which may be caused to overlap variably with the two through apertures of the fixed control disc, the leading limiting line in the direction of opening a control edge is formed shaped such that the movable control disc in its central rotated position when opening unblocks both through apertures of the fixed control disc in different ways.
Amongst the most widespread of sanitary mixer taps may be counted so-called single lever taps such as are also used in particular in wash-stands. In them, the cold water and hot water paths are generally treated symmetrically. This means in particular that when opening the mixer in the central rotated position of the movable control disc cold and hot water are released in the same manner into the flow. The central rotated position of the movable control disc is that which is generally adopted in the closed position. This is often done unconsciously with single lever mixers by the user since out of a sense of tidiness he seeks to have the control lever aligned with the outlet of the appliance. Many constructions furthermore provide that the sanitary mixer tap can only be turned off in this central rotated position so that the movable control disc thus automatically returns to the central rotated position on turning off the appliance. If a sanitary tap of this type which has been closed in the central rotated position of the movable control disc is now opened, then in principle both cold and hot water flow at first even when the user does not actually either need or desire this for the purpose he has in mind e.g. for washing his hands. In general the temperature of the water flowing out is not corrected towards cold on the grounds of idleness. In this manner much energy is wasted.
A sanitary mixer tap of the type specified at the outset is described in DE-PS 33 10 080. In this the symmetrical treatment of cold and hot water flows is sacrificed for a quite specific purpose. This known appliance is intended for use with continuous-flow water heaters in which provision must be made for a minimum throughput of hot water for avoidance of frequent switching on and off. For this reason, the control edge on the recess of the movable control disc of this tap has an outline by which the hot water area is preferably opened wide, that is to say that mainly hot water flows and colder water is then produced by mixing in cold water. The only reason for this outline of the control edge of the known tap is thus the special application in a continuous-flow water heater and basically leads to undesirable conditions from an energy point of view.
It is the task of the present invention to arrange a sanitary mixer tap of the type specified at the outset such that any unwanted hot water flow and thereby unwanted energy losses are avoided.
This task is solved according to the invention in that such that when opening the tap in the central rotated position of the movable control disc first of all only the through aperture of the fixed control disc connected to the cold water supply is opened and only after continued linear motion of the movable control disc is the through aperture of the fixed control disc connected to the hot water supply also unblocked.
The invention thus makes use for its purposes of the knowledge already indicated above that when turning off the mixer tap the movable control disc is generally brought back into its central rotated position. Through the special outline of the control edge on the movable control disc, a situation is arrived at that when turning on the tap at first only cold water is offered to the user. In many cases the user is satisfied with this without being especially aware of it. Only
REFERENCES:
patent: 4623000 (1986-11-01), Kropp
Fox John C.
Hansa Metallwerke AG
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