Liquid purification or separation – Flow – fluid pressure or material level – responsive – Discharge of treated material
Patent
1986-10-15
1988-10-18
Fisher, Richard V.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Discharge of treated material
210120, 210123, 210169, 137202, 137587, 251332, 251333, B01D 2320, B01D 3338
Patent
active
047785950
ABSTRACT:
An automatic air pressure relief and check valve assembly which may be used in combination with a swimming pool filter or separation tank. The valve assembly includes a normally open lower valve which is responsive to the tank's being full of water for closing the lower valve, and a normally closed upper valve which is responsive to air being expelled from the tank through the normally open lower valve for opening the upper valve during times when water is filling the tank. The upper valve may be selectively opened when air is required to enter the tank so that water may be drained from the tank. Preferred embodiments of the upper and lower valves include valve seats having conical surfaces and respective valve members which cause an included O-ring to roll upon and wedge against its conical seat for reliably closing each valve.
REFERENCES:
patent: 511995 (1894-01-01), Buckley
patent: 540760 (1895-06-01), Sawyer
patent: 757873 (1904-04-01), Allen
patent: 924641 (1909-06-01), Crispin
patent: 1073354 (1913-09-01), Lauterbach
patent: 1294002 (1919-02-01), Weatherhead
patent: 1698990 (1929-01-01), Derryberry
patent: 2347092 (1944-04-01), Evans
patent: 2752941 (1956-07-01), Mitchell
patent: 2764172 (1956-09-01), Strayer
patent: 2768704 (1956-10-01), Cronkhite
patent: 2909186 (1959-10-01), Larson
patent: 2935990 (1960-05-01), Biddle
patent: 3152604 (1964-10-01), Frye et al.
patent: 3216451 (1965-11-01), Smallpeice
patent: 3396974 (1968-08-01), Nord
patent: 3401751 (1968-09-01), Loftin et al.
patent: 3586032 (1971-06-01), Weinstein
patent: 3736950 (1973-06-01), Smallwood
patent: 3786829 (1974-01-01), Nardo et al.
patent: 3957640 (1976-05-01), Stack
patent: 4094346 (1978-06-01), Milo
patent: 4230142 (1980-10-01), Saarem et al.
patent: 4574048 (1986-03-01), van den Broek
patent: 4640304 (1987-02-01), Looney
The Johnson Corporation, Bulletin VB-1001, "Vacuum Breakers", 6-12-84.
Pages 6-25 and 6-26 of Parker Handbook.
Church Henry
Graboff Roy
Maldarelli Lawrence V.
Sable Chester A.
Anthony Industries, Inc.
Fisher Richard V.
Lee Coreen Y.
Weiss David
LandOfFree
Automatic valve assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic valve assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic valve assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1193658