Heating oil pump for selective single or double line operation

Details Heating oil pump for selective single or double line operation Heating oil pump for selective single or double line operation

1987-03-20

1988-10-04

Freeh, William L.

Pumps

With condition responsive pumped fluid control

Plural paths having individual condition responsive control...

417305, 417310, F04B 4902

Patent

active

047753005

ABSTRACT:
A heating oil pump which is intended for selective single or double line operation. Between the suction side and return side there is a connecting passage which, for double line operation, is closable by a closure member. The latter is displaceable upon insertion of a plug from a closed to an open position by an actuating element which projects into the inserting path of the plug and, upon removal of the plug, back to the closed position by a return spring. This results in automatic change-over without the need for the return pressure to be higher than the suction pressure.

REFERENCES:
patent: 1628905 (1928-07-01), Goldberg
patent: 2144228 (1939-01-01), Penick et al.
patent: 2654323 (1953-10-01), Wahlmark
patent: 2915015 (1959-12-01), Erikson
patent: 3531220 (1970-09-01), Enemark
patent: 3580420 (1971-05-01), Kennedy
patent: 3612722 (1971-10-01), Neward
patent: 3685925 (1972-08-01), McJones
patent: 3865518 (1975-02-01), Sjofun

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