Liquid purification or separation – Flow – fluid pressure or material level – responsive – Discharge of treated material
Reexamination Certificate
1999-03-26
2001-01-09
Barry, Chester T. (Department: 1724)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Discharge of treated material
C210S136000, C210S416300
Reexamination Certificate
active
06171481
ABSTRACT:
The present invention relates to a water purifier comprising an inlet conduit with a high-pressure pump, a purifier unit of the type comprising a filter or a membrane, an outlet conduit for purified water, a sensor provided in said outlet conduit for the control of the high-pressure pump, a tapping point at which the outlet conduit opens, a non-return valve disposed in said outlet conduit, and a reject conduit for concentrated unpurified water. The invention also refers to a pressure equalizing valve provided to be included in said water purifier.
In pressurized water purifiers of the kind referred to a pressure is building up in the conduit for purified water when tapping of purified water is interrupted and the pump is inactivated when a predetermined pressure has been reached. It is of extreme importance that said pressure be maintained because when the pressure in the conduit for purified water is lowered under a certain predetermined level the water purifier pump will start causing water to be supplied via the inlet conduit until a sufficient pressure has again been built up in the conduit for purified water. This type of false start can be felt very much annoying. As, in principle, it is impossible to get all valves, taps and joints to be completely tight in water purifiers of the kind referred to leakage cannot be completely avoided. Besides, water purifiers of the kind discussed are often provided with hard conduits so that the system cannot accumulate sufficient water to compensate for the pressure drop. The system is too rigid. Due to the rigid system only a couple of leaking drops are sufficient for the pressure to drop considerably, i.e. below the predetermined value at which the pump starts.
The object of the present invention is to compensate for the pressure drop that can occur in the conduit for purified water in case of a few leaking drops, i.e. the pressure in the conduit for purified water is to be maintained, for a long period of time, at a level above the predetermined pressure level at which the pump is caused to start. Such compensation is achieved by a water purifier and a pressure equalizing valve, respectively, as defined in the following claims.
REFERENCES:
patent: 3698688 (1972-10-01), Kutz
patent: 4298029 (1981-11-01), Zahid
patent: 5351337 (1994-09-01), Deutsch
patent: 5401395 (1995-03-01), Hagqvist et al.
patent: 5709546 (1998-01-01), Waggoner
patent: 1 293 597 (1972-10-01), None
Aktiebolaget Electrolux
Barry Chester T.
Pearne & Gordon LLP
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