Hydraulically activated three-way-valve

Pumps – With condition responsive pumped fluid control – Reversibly driven pump having bypass active in either flow...

Reexamination Certificate

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Details

C137S625500

Reexamination Certificate

active

06354813

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to hydraulically activated three-way-valves, especially for gas-fired instantaneous hot water supply systems.
PRIOR ART
Instantaneous gas-boilers are known which can switch between domestic hot water production and hydronic room heating. In both cases water acts as a heat carrier. This water passes either through the radiators or through a heat exchanger which transfers heat from a water circuit to domestic hot water. In these cases the generation of domestic hot water has preference to the room-heating. The switching between the two circuits is performed by a three-way-valve. This three-way-valve can be activated by reversing the rotation of the circulator pump. The disadvantage is that a first valve element has to be connected to the second valve element by a traverse which can lead to a blockage or to leaking.
SUMMARY OF THE INVENTION
The invention prevents these disadvantages. The invention refers to three-way-valves which are activated hydraulically. The valves according to the invention comprise membranes, which separate a fluid chamber from the water circuit. The membranes for instance can be connected to two pressure sensors which are located close to the periphery of a reversible pump impeller or they can be connected to both sides of an orifice within the hot water circuit. The three-way-valves are also suitable for swimming pools. An object of the invention is also the coordination with the elements of an instantaneous gas heater or of a swimming pool-installation.


REFERENCES:
patent: 3837615 (1974-09-01), Espeel
patent: 3868969 (1975-03-01), Schwenk
patent: 3897903 (1975-08-01), Race
patent: 4175590 (1979-11-01), Grandclement
patent: 4196941 (1980-04-01), Goebels
patent: 4276004 (1981-06-01), Hahn
patent: 4787427 (1988-11-01), Bacroix et al.
patent: 5139225 (1992-08-01), Olson et al.
patent: 5261798 (1993-11-01), Budde
patent: 6171495 (2001-01-01), Drori

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