Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1999-08-25
2000-12-05
Rivell, John
Fluid handling
Line condition change responsive valves
Direct response valves
137512, 251 65, F16K 1503, F16K 3108
Patent
active
061552917
ABSTRACT:
A dual check valve backflow prevention apparatus of lightweight, compact construction which provides low flow losses and which maintains a small positive pressure differential under static flow conditions via use of a magnetic valve closure mechanism. The apparatus comprises a main valve housing which contains two check valve assemblies. Each check valve assembly has a clapper valve which uses a low friction magnetic pull closure force and drip tight seals in the forward flow direction for maintaining a small positive pressure differential under static conditions. The magnetic bias for the closure force is preferably located in the center of the flow stream. An additional closure force may be provided by a spring or gravity assistance.
REFERENCES:
patent: 2630294 (1953-03-01), Ericson et al.
patent: 2842150 (1958-07-01), Olson
patent: 3265062 (1966-08-01), Hesse
patent: 3294115 (1966-12-01), Koenigsberg et al.
patent: 3417795 (1968-12-01), Hesse
patent: 3422841 (1969-01-01), Farrer
patent: 3891000 (1975-06-01), Melnick
patent: 3905391 (1975-09-01), Oakes
patent: 3974854 (1976-08-01), Kurpanek
patent: 4063570 (1977-12-01), Mitchell et al.
patent: 4270559 (1981-06-01), Wallberg
patent: 4313462 (1982-02-01), Adamson
patent: 4332271 (1982-06-01), Rohr
patent: 4874012 (1989-10-01), Velie
patent: 4893654 (1990-01-01), Feuz
patent: 5203365 (1993-04-01), Velie
patent: 5236009 (1993-08-01), Ackroyd
patent: 5385166 (1995-01-01), Dunmire et al.
patent: 5503176 (1996-04-01), Dunmire et al.
patent: 5524663 (1996-06-01), Walsh et al.
patent: 5584315 (1996-12-01), Powell
patent: 5713389 (1998-02-01), Wilson, Jr. et al.
patent: 5785077 (1998-07-01), Rice
patent: 5794655 (1998-08-01), Funderburk et al.
patent: 5947152 (1999-09-01), Martin et al.
Backflow Prevention brochure, Cla-Val Company, 1978.
Hunter Innovations
Rivell John
Schoenfeld Meredith H.
LandOfFree
Backflow prevention apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Backflow prevention apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Backflow prevention apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-952116