Baths – closets – sinks – and spittoons – Flush closet – Tank only
Patent
1997-08-08
1999-07-27
Walczak, David J.
Baths, closets, sinks, and spittoons
Flush closet
Tank only
4324, E03D 134
Patent
active
059268611
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a discharge valve and is primarily intended to provide a light action, easily operable, fast flowing valve assembly for emptying or partly emptying cisterns and other types of liquid storage containers. It is particularly, although not exclusively applicable to being used to reduce the amount of water used for flushing domestic toilets or water closets.
BACKGROUND OF THE INVENTION
For a great many years flushing toilets, pans and bowls have been in existence, and the water closet in one form or another, is common place in all modem homes. With the conventional low flush or close coupled toilet cistern and pan, the means for achieving the flush consists either of a siphon (which at present for the U. K. is still the only acceptable device that meets the water byelaws) or one of a number of non-siphon type valves used extensively on the continent and elsewhere in the world.
These non-siphon on direct type valves, have a valve plate or member which covers and seals the outlet to prevent water from escaping unintentionally. Both the siphon and the direct type flush valve have a threaded outlet pipe which extends downwards through the bottom of the cistern into which it is fixed by a bulkhead fitting. It is then connected to the toilet pan either directly or by a short length of pipe.
With the sole means of flushing or cleaning the pan being the water discharge from the cistern 1 the effectiveness of the flush is mainly dependent on flow rate. Most siphons do not have a good flow rate and require a considerable amount of water to achieve a satisfactory flush; moreover they are sensitive to changes in water level setting and most do not perform satisfactorily below a medium level setting. With some-siphon installations, the flow rates are so low that in some cases more than one flush-is necessary.
Non-siphon type valves generally achieve greater flow rates and with the kinetic energy of the water in the pan approximately doubling for a 50% increase in flow rate, less water is required for an effective flush. In fact the performance of most U. K. toilet pans could be considerably improved by replacing the siphon with a direct discharge valve. Some existing installations in the U. K. and elsewhere would accommodate even higher flow rates than are generally available with existing flush valves. For new installations, by designing the galleries and contours of the pan and cistern in conjunction with a high performance non-siphon flush valve, the quantity of water required for effective flushing could be substantially reduced. For instance with a valve of the type described in this specification installed in the U. K. the amount of water required could be reduced from 7 liters to 3.5-4.5 liters full flush capacity for all installations since January 1993 and from 9 liters to 3.5-4.5 liters for installations prior to then. Moreover when the valve is operated in its short flush mode only 1.5-2.0 liters are required.
In my patent GB-B-2274344 I have described a discharge valve of improved performance and the present invention aims to provide further improvements in this respect.
Accordingly it is an object of the present invention to provide a fluid outlet valve to increase and enhance the performance of water closets.
It is a further object to provide a valve that can operate a full or partial flush, a so-called dual flush valve.
It is also an object to provide a convenient overflow means through the valve, with the added advantage of the quantity of water required for fully or partly flushing being considerably reduced.
SUMMARY OF THE INVENTION
Accordingly the invention provides a device, for immersion in a fluid in a cistern, which comprises an upper housing, an upwardly moveable main valve assembly within the housing and forming with the upper part thereof a variable volume upper chamber, a pressure balance hole between the upper chamber and the surrounding exterior and an outlet leading down from the lower part of the housing, a seat for the main valve assembl
REFERENCES:
patent: 4176821 (1979-12-01), Strangfeld
patent: 4357720 (1982-11-01), Stahli
patent: 4956880 (1990-09-01), Bailet
patent: 5331690 (1994-07-01), Pourcier
patent: 5349981 (1994-09-01), Schmucki et al.
patent: 5652970 (1997-08-01), Wodeslavsky
patent: 5653252 (1997-08-01), Steg et al.
Derwent MacDee Limited
Walczak David J.
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