Pumps – Successive stages – Reciprocating rigid stages
Patent
1974-09-04
1976-03-02
Freeh, William L.
Pumps
Successive stages
Reciprocating rigid stages
417552, F04B 300
Patent
active
039415163
ABSTRACT:
A water well pump assembly designed for operation within a well casing and embodying a pump cylinder having the usual foot valve and traveling plunger valve, together with a novel head valve which is disposed at the upper end of the cylinder above the plunger valve and which functions when an excess quantity of air enters the cylinder through the foot valve to prevent the hydrostatic column of liquid in the liquid outlet pipe above the plunger from following the latter during its downstroke. By such an arrangement, the resultant partial vacuum which is established by downward movement of the plunger causes the foot valve to become seated and the traveling valve to become unseated so that upward movement of the plunger causes unseating of the head valve and passage of the excess air upwardly into the liquid outlet pipe. Continued reciprocation of the plunger causes the pump assembly to function in the manner of a gas pump until such time as the excess air is discharged from the cylinder, after which the pump assembly resumes its function as a water pump.
REFERENCES:
patent: 765541 (1904-07-01), Beers
patent: 968029 (1910-08-01), Cross
patent: 1043279 (1912-11-01), Wheeler
patent: 1542248 (1925-06-01), Howe
patent: 1696007 (1928-12-01), Lewis et al.
patent: 1793572 (1931-02-01), VONLinde
patent: 2723625 (1955-11-01), Nichols
patent: 3074352 (1963-01-01), Vincent
Freeh William L.
Lowndes Edward R.
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