Patent EP0207804A2 successfully refreshed from Google Patents.
EP0207804A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
The management of water in recirculatory water systems
Assignee: Sdi Water Technology Ltd
•
Filing: 1986-07-04
•
Granted: —
•
Expires: 2006-07-04
Abstract
Abstract In a recirculatory water system of the kind in which water is lost as water vapour, the invention provides a unit having ducting (1) through which part only of the water flows. The unit includes various components disposed in the following order along the ducting: a monitor such as a conductivity probe (9), blow-down means, consisting of an electrically-operated valve (14) and a flow regulator (15), a non-return valve (18) and dosing means (19, 20 and 21). When the monitor detects a concentration of dissolved solids greater than a predetermined concentration it causes blow-down, during which the valve is opened for a predetermined period. Thereafter, blow-down is inhibited for a further period. After a predetermined number of blow-downs, the dosing means adds such materials as biocides and chemicals to reduce corrosion and/or scale-formation, so as to replace those lost during blow-down.
Inventors
- 👤 Stuart Markham Fredericks
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 22:39
CPC Classifications
F; F24; F24F; F24F6/00; C; C02; C02F; C02F9/00; C02F9/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
147 words
A water-treatment unit for use with a recirculatory water system of the kind such that in use water is lost from the system in the form of water vapour, and comprising water ducting (1) with an inlet (2) and an outlet (3) for connection to spaced locations of the system so that the ducting affords a pathway or pathways for only part of the water flowing from one location to the other, dosing means (19, 20, 21) operative to add to water in the ducting controlled amounts of material in the form of one or more additives, and blown-down means comprising monitoring means (9, 10) operative to monitor water flowing through the ducting and withdrawal means (14, 15) operative to bring about the removal of water from the ducting when the monitoring means detects that the concentration of substances dissolved in the water exceeds a predetermined value.
Claim 2
Dependent Claim
147 words
A water-treatment unit for use with a recirculatory water system of the kind such that in use water is lost from the system in the form of water vapour, and comprising water ducting (1) with an inlet (2) and an outlet (3) for connection to spaced locations of the system so that the ducting affords a pathway or pathways for only part of the water flowing from one location to the other, dosing means (19, 20, 21) operative to add to water in the ducting controlled amounts of material in the form of one or more additives, and blown-down means comprising monitoring means (9, 10) operative to monitor water flowing through the ducting and withdrawal means (14, 15) operative to bring about the removal of water from the ducting when the monitoring means detects that the concentration of substances dissolved in the water exceeds a predetermined value.
Claim 3
Dependent Claim
35 words
A water-treatment unit according to claim 1 in which the monitoring means (9, 10) is upstream of a withdrawal point (12) in the ducting from which water is removed during operation of the withdrawal means.
Claim 4
Dependent Claim
24 words
A water-treatment unit according to claim 2 in which there is a non-return valve (18) in the ducting downstream of the withdrawal point (12).
Claim 5
Dependent Claim
37 words
A water-treatment unit according to any one of the preceding claims in which the dosing means (19, 20, 21) is operative to add material to the water in the ducting downstream of the monitoring means (9, 10).
Claim 6
Dependent Claim
37 words
A water-treatment unit according to any one of the preceding claims in which the dosing means (19, 20, 21) is operative to add material to the water in the ducting downstream of the withdrawal means (14, 15).
Claim 7
Dependent Claim
38 words
A water-treatment unit according to claim 5 in which there is a non-return valve (18) between the withdrawal means (14, 15) and the location or locations (19, 20, 21) where the material is added by the dosing means.
Claim 8
Dependent Claim
39 words
A water-treatment unit according to claims 3 and 6 in which the non-return valve (18) in the ducting downstream of the withdrawal point constitutes the same non-return valve as is between the withdrawal means and said location or locations.
Claim 9
Dependent Claim
33 words
A water-treatment unit according to any one of the preceding claims in which the monitoring means (9, 10) comprises a conductivity probe operative to determine the conductivity of water flowing through the ducting.
Claim 10
Dependent Claim
60 words
A water-treatment unit according to any one of the preceding claims in which the withdrawal means comprises a discharge valve (14) which, when open, permits water to be discharged from the ducting at a regulated rate, and a timer operative to cause the discharge valve to close when a predetermined period has elapsed after the discharge valve has been opened.
Claim 11
Dependent Claim
48 words
A water-treatment unit according to claim 9 in which there is timing means operative to render the blow-down means inoperative for a predetermined period of time after it has been operative to discharge water from the ducting, after which period it again becomes responsive to the monitoring means
Claim 12
Dependent Claim
42 words
A water-treatment unit according to any one of the preceding claims in which there is a counter which registers the number of occurrences of blow-down and causes operation of the dosing means when a predetermined number of such occurrences has been registered.
Claim 13
Dependent Claim
53 words
A recirculatory water system of the kind such that in use water is lost from the system in the form of water vapour, in combination with the water-treatment unit in accordance with any one of the preceding claims, the inlet and outlet of the ducting being connected to spaced locations of the system.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.