Means for feeding fluid into a pressure conduit

Details Means for feeding fluid into a pressure conduit Means for feeding fluid into a pressure conduit

1988-11-23

1990-07-24

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

417216, F04B 4106

Patent

active

049432125

ABSTRACT:
Connected to a pressure conduit are a plurality of fixed displacement pumps and a variable displacement pump which are connectable and disconnectable in accordance with the amount of fluid withdrawn. The maximum delivery rate of the variable displacement is greater than the delivery rate of each fixed displacement pump. For the minimum and maximum delivery rate of the variable displacement pump two switching points are defined at each of which a fixed displacement pump is connected or disconnected. This gives a reliable fluid supply of the pressure conduit without any danger of erroneous switchings.

REFERENCES:
patent: 3060858 (1962-10-01), Shoosmith
patent: 3229639 (1966-01-01), Hignutt et al.
patent: 4259038 (1981-03-01), Jorgensen et al.
patent: 4496289 (1985-01-01), Heiser et al.

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