Eccentric screw pump with liquid bypass controlled by a flexible

Details Eccentric screw pump with liquid bypass controlled by a flexible Eccentric screw pump with liquid bypass controlled by a flexible

1994-09-07

1995-12-05

Bertsch, Richard A.

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

417310, 418 48, F04B 4900, F01C 500

Patent

active

054723191

ABSTRACT:
An eccentric screw pump with a pump casing (1) having an intake stub (6) and a delivery stub (7) and enclosing a suction chamber (8) and a delivery chamber (9). A stator (2) arranged in the said casing surrounds a rotor (3) that can be driven by a motor. In order to permit multi-phase delivery, a lower portion (9a) of the delivery chamber (9) is connected to the suction chamber (8) via a liquid bypass line having a valve opening (13) that can be actuated by a control element on the basis of the differential pressure between the delivery and the suction chambers (9, 8) in such a way that the valve (13, 14) is open in the case of the differential pressure which arises in the delivery of dry-running gas but is closed in the case of the differential pressure which arises during the delivery of liquid.

REFERENCES:
patent: 2413040 (1946-12-01), Elliot
patent: 2472734 (1949-06-01), Thomas et al.
patent: 2826152 (1958-03-01), Michie
patent: 3380391 (1968-04-01), John
patent: 3813187 (1974-05-01), Winter
patent: 4284212 (1981-08-01), Caswell
patent: 4307889 (1981-12-01), Piazza
patent: 4401417 (1983-08-01), Davis
patent: 4714413 (1987-12-01), Duffy
patent: 5108273 (1992-04-01), Romanyszyn, Jr.

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