Automatic temperature and humidity regulation – Mixing fluid of dissimilar temperature – Including bypass
Reexamination Certificate
2000-01-18
2001-08-28
Tapolcai, William E. (Department: 3744)
Automatic temperature and humidity regulation
Mixing fluid of dissimilar temperature
Including bypass
C236S012200
Reexamination Certificate
active
06279831
ABSTRACT:
The invention is based on a thermostatic valve, in which with the aid of a first operating member it is possible to set a desired temperature, whilst the quantity of outflowing water can be determined with a second operating member. In a known valve of this type the temperature changes with the opening of the valve in such a way that when the valve is opened initially no cold water flows out.
The problem of the invention is to further improve a thermostatic valve.
According to the invention this problem is solved by a mixing fitting having the features of claim
1
. Further developments of the invention form the subject matter of the dependent claims, whose wording, like that of the abstract, is by reference made into part of the content of the description.
If the valve proposed by the invention is opened with a single lever, initially and independently of the thermostat position, cold water flows out of the outlet, which protects against excessive temperatures and leads to an energy saving.
According to a further development of the invention, the control system is constructed in such a way that at the start of the opening movement the inlet for the cold water is opened before that for the hot water. This measure aids the behaviour of the valve.
According to a further development of the invention, the direct connection between the cold water inlet and the mixed water outlet is parallel to the connection via the thermostatic valve. As the flow resistance through the thermostatic valve in the case of a corresponding design of the direct connection can be made greater than the flow resistance through the latter, it is possible to ensure that at the start of opening the cold water exclusively flows through the direct connection to the outlet. As a result of the design of the direct connection it is also possible to ensure that there can be a continuous or flowing transition between the direct connection and the connection through the thermostatic valve.
The invention proposes that the control is optionally constructed in such a way that as the control system opening movement progresses the direct connection is closed again. It can in particular be provided that the direct connection is gradually closed and the connection via the thermostatic valve gradually opened.
The control system can in particular have control disks, e.g. a fixed control disk and a rotatable control disk and as a result of a more or less pronounced covering of openings in the control disks connections can be formed and closed.
According to the invention the direct connection can be provided by a lateral recess of the mixed water opening in the fixed control disk.
The prior opening of the inlet for the cold water can be brought about through an asymmetrical arrangement of the inlet opening in the fixed control disk.
REFERENCES:
patent: 4286749 (1981-09-01), Oguma
patent: 4700885 (1987-10-01), Knebel
patent: 5011074 (1991-04-01), Kline
patent: 5551630 (1996-09-01), Enoki et al.
patent: 28 03 663 (1979-08-01), None
patent: 32 18 091 (1983-01-01), None
patent: 31 28 968 (1983-02-01), None
patent: 0 560 737 (1993-09-01), None
patent: 0 775 954 A1 (1997-05-01), None
patent: 2 424 459 (1979-11-01), None
patent: WO 90/12351 (1990-10-01), None
Duane Morris & Heckscher LLP
Hansgrohe AG
Tapolcai William E.
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