Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1985-03-18
1987-06-30
Fisher, Richard V.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210108, 210138, 210169, 55 96, 55283, 417 12, B01D 3500, B01D 4100
Patent
active
046769145
ABSTRACT:
A pump (B) pumps water from a swimming pool (A) to a forward/reverse direction control valve (D). The control valve (D) has a first or forward flow state in which it channels water into an inlet (20) of a filter (C) and from a filter outlet (24) back to the swimming pool and a second state in which it channels the water into the fluid outlet (24) and from the fluid inlet to a drain (28). A microprocessor based electronic control circuit (E) selectively actuates the pump at preselected intervals for preselected durations such that the water from the swimming pool is intermittently filtered. The control circuit further monitors the fluid pressure with a low pressure limit switch (46). In response to the pumped fluid pressure failing to achieve a low limit within a preselected duration, the control circuit terminates operation of the pump. Further, the control circuit monitors the water pressure with a high pressure limit switch (48). In response to the monitored pressure exceeding the high limit, the control circuit causes the forward/reverse valve (D) to assume its second state and backwash the filter automatically. The microprocessor also calculates the volume of fluid discharged through a drain, which is automatically replaced with fresh fluid.
REFERENCES:
patent: 3581895 (1971-06-01), Howard et al.
patent: 3616915 (1971-11-01), Whitlock
patent: 3630363 (1971-12-01), Nash et al.
patent: 3670893 (1972-06-01), Seid
patent: 3957395 (1976-05-01), Ensign
patent: 3963375 (1976-06-01), Curtis
patent: 4180374 (1979-12-01), Bristow
patent: 4273513 (1981-06-01), Salina
patent: 4329120 (1982-05-01), Walters
patent: 4394262 (1983-07-01), Bukowski et al.
patent: 4482461 (1984-11-01), Hindman et al.
patent: 4487689 (1984-12-01), Galaj
patent: 4505643 (1985-03-01), Millis et al.
Grys Rodger J.
Mills Donald E.
Evans Linda S.
Fisher Richard V.
North Coast Systems, Inc.
LandOfFree
Microprocessor based pump controller for backwashable filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microprocessor based pump controller for backwashable filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microprocessor based pump controller for backwashable filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-446541