Pumps – One fluid pumped by contact or entrainment with another – Liquid pumped by supplying or exhausting gaseous motive...
Patent
1998-04-28
2000-04-04
Wolfe, Willis R.
Pumps
One fluid pumped by contact or entrainment with another
Liquid pumped by supplying or exhausting gaseous motive...
417126, 210170, 137393, 137434, F04F 108, F16K 3126, E03B 506
Patent
active
060453362
ABSTRACT:
In combination with a pump, a valve for operation at the interface between underlying heavier liquid and overlying lighter liquid is disclosed. The valve includes an inlet within the heavier liquid communicated from a valve seat to a conduit which typically is connected to the inlet of a pump. A valve disc opens and closes the valve seat to admit the heavier liquid to flow to the pump. The pump is preferably pneumatic and of the type which when flooded with liquid, automatically undertakes pumping and when empty of liquid ceases pumping. A buoyant member having a specific density between that of the lighter liquid and the heavier liquid is buoyantly supported at the interface and moves with the interface. This buoyant member is connected to an assembly which actuates the valve. Where lighter liquid is predominantly present, the float sinks and closes the valve preventing pumping. Where heavier liquid is predominantly present, the float rises, opens the pump inlet to permit pumping. Specific mechanisms are present for valve operation including a surrounding casing for protecting the valve from debris and a rocker arm arrangement for valve operation.
REFERENCES:
patent: 4663037 (1987-05-01), Breslin
patent: 5004405 (1991-04-01), Breslin
patent: 5358038 (1994-10-01), Edwards et al.
patent: 5495890 (1996-03-01), Edwards et al.
patent: 5641272 (1997-06-01), Harrold
patent: 5662460 (1997-09-01), Modesitt
Hitchcock Thomas H.
Webb Richard T.
Clean Environment Engineers, Inc.
Wolfe Willis R.
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