Liquid purification or separation – Flow – fluid pressure or material level – responsive – Check valve
Patent
1976-12-06
1978-08-08
Sever, Frank
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Check valve
13762529, 1375991, 210169, 210278, 210426, 210432, 251283, B01D 2324
Patent
active
041055551
ABSTRACT:
A valve is provided adapted to multiple modes of use including filter, backwash, rinse, recirculate, and direct to waste, on a swimming pool filter of the type normally filtering water under pressure through a backwash-regenerable filtering medium disposed in a filter tank. The valve comprises closely interfitting, relatively rotatable inner and outer sections having coaxially tapered annular walls defining interiorly open spaces respectively within the sections; the outer section wall has formed therein circularly spaced outer ports including an inlet port, a first outlet port, and a second outlet port. The inner section is normally seated against the outer section wall, its interior space being adapted to define a continuation of the filter tank in continuously hydraulically filled relation against unseating pressure imbalances across the inner section. The inner section wall has formed therein a circular series of inner ports selectively pair-registrable with different pairings of the outer ports to define one or another of the several use modes mentioned above.
REFERENCES:
patent: 1937324 (1933-11-01), Pick
patent: 2182459 (1939-12-01), Vickers
patent: 2907349 (1959-10-01), White
patent: 2946348 (1960-07-01), North
patent: 3316937 (1967-05-01), Friedman
patent: 3451554 (1969-06-01), Wade
patent: 3536295 (1970-10-01), Sinkler
patent: 3640310 (1972-02-01), Erlich
patent: 3707233 (1972-12-01), Lerner
patent: 3809247 (1974-05-01), Brett
patent: 3907688 (1975-09-01), Close
Bachand Louis J.
Sever Frank
Tolo, Incorporated
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