Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Patent
1985-12-10
1986-11-11
Walton, George L.
Fluid handling
Liquid level responsive or maintaining systems
By float controlled valve
137428, 137430, 137432, 137579, 4507, 4508, F16K 3126, F16K 3300
Patent
active
046216570
DESCRIPTION:
BRIEF SUMMARY
This invention relates to systems for automatic supervision of water supply to reservoirs, and more particularly to monitoring systems for automatically maintaining a selected water level within a swimming pool, spa, or the like.
BACKGROUND ART
Several attempts have been made to provide an effective monitoring system of this kind which will comply with the stringent requirements of public water authorities regarding cross connection and the minimum height of fresh water inlet valves above spill levels of swimming pools. A breaker tank is generally required which of necessity is of such large proportions as to be difficult to site on domestic premises.
Of course, ball float valves, and similar water level maintaining devices used in other applications such as water cisterns, are well-known but would not be either of sufficiently compact form or readily convertible for compliance with water authority regulations, for use in the instant application. Furthermore, such existing devices do not provide a ready and convenient facility for water level adjustment which should be available to the owner of a domestic swimming pool.
DISCLOSURE OF INVENTION
It is the principal object of the invention to provide a monitoring system for the above purpose which will meet the described requirements of public authorities and is compact and efficient in operation.
To this end the invention in one general form provides a water level monitoring system for a water reservoir such as a swimming pool, comprising a chamber, a water duct for connecting said chamber and said reservoir to establish corresponding water levels therein, adjustable overflow relief means for determining a desired water level for said reservoir, final overflow relief means for said chamber for limiting said water level to a maximum level, a fresh water inlet to said chamber connected by a substantially vertical water line to a diaphragm valve positioned above said maximum water level, an overhead actuator for said valve and an annular float in said chamber encircling at least the extended axis of said water line and supported adjustably in height within said chamber from opposite parts of said actuator to effect opening of said valve by said actuator with falling water level below a predetermined level to add fresh water to the chamber and thus to the reservoir to restore the water level to said predetermined level.
BRIEF DESCRIPTION OF DRAWINGS
The invention will be described in more detail with reference to the accompanying drawings, in which:
FIG. 1 shows diagramatically a monitoring system of the invention connected to an in-ground domestic swimming pool;
FIG. 2 is a sectional view through the monitoring chamber of the system; and,
FIG. 3 is a plan view thereof with the cover removed.
BEST MODE OF CARRYING OUT THE INVENTION
The monitoring system of the invention as shown in FIG. 1 consists of a housing 3, preferably of plastics, having a base portion 4 set with its rim level with the pool spill level and a cover 5 which is removable for access to internal chamber 6 shown, in detail in FIG. 2. The cover 5 is provided with an airbreak orifice 5A (FIG. 2) conforming with the water authority's airbreak requirements. The housing 3 may be located at any convenient position on the domestic premises and is connected by water duct 7 from adjacent the bottom of the chamber 6 to a side wall of the swimming pool 8 which is well below the minimum water level maintained within the pool 8. A normal water level 9 is shown and, of course, any water level in the chamber 6 will always correspond to that in the pool 8. Overflow apertures 10 in the rim of the base portion 4 of the housing 3 are positioned at a level slightly below the pool spill level 11. Ideally, the water level 9 in the pool 8 will be maintained at the general water level 12, but depending upon personal choice it may be permitted to fluctuate between a low water level 13 and a high water level 14 (see FIG. 2) which to some extent will depend upon factors such as evaporation and rain fall. A rot
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Roto Moulded Plastics Pty. Limited
Walton George L.
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