Pumps – With condition responsive pumped fluid control – Fluid flow rate responsive
Patent
1977-02-07
1979-02-06
Vrablik, John J.
Pumps
With condition responsive pumped fluid control
Fluid flow rate responsive
417310, 417440, F04B 4910
Patent
active
041382048
ABSTRACT:
A gear pump which comprises a casing provided with an inlet port communicating with an intake chamber, and a delivering port communicating with a delivery chamber. A drive gear is mounted in meshing engagement with a driven gear, each gear being placed in a corresponding bore in the casing, the gears being placed in the flow path between the intake chamber and the delivering chamber.
One of the gears contains a central bore with passages which connect the bore to the gaps between adjacent teeth of the gear. A spool is slidable in the central bore for controlling fluid communication through the passages and the movements of the spool are controlled by the pressure difference between the fluid pressure in the delivery chamber and an operating pressure in such a way that the spool is held in a closure position in which the communication through the passages remains blocked as long as the delivery of the pump remains below a given level corresponding to a predetermined pressure difference.
REFERENCES:
patent: 3120814 (1964-02-01), Mueller
patent: 3153508 (1964-10-01), Sawyer
patent: 3322134 (1967-05-01), Enemark
patent: 3427980 (1969-02-01), Jubb et al.
patent: 3527548 (1970-09-01), Kocher et al.
patent: 3568435 (1971-03-01), May
patent: 3667859 (1972-06-01), Dragsund et al.
patent: 3751190 (1973-08-01), Cecchi
patent: 3813187 (1974-05-01), Winter
patent: 3957075 (1976-05-01), Kunz et al.
Bendiberica /S.A.
Decker Ken C.
Look Edward
Schoenle Paul David
Vrablik John J.
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