Igor J Karassik

47401370, Apr 26, 1988

Nov 17, 1986

6/931386

Igor J. Karassik - Maplewood NJ

Dresser Industries, Inc. - Dallas TX

F04D 106

415 11

The pump system provides for a more efficient operation of multistage centrifugal pumps operating at less than designed capacity. The system includes a flow meter located in the inlet conduit to the pump, a control valve is located in a discharge conduit that extends from the discharge of the first stage of the pump to the inlet conduit, and a connection between the flow meter and control valve whereby the control valve will open to bypass liquid from the first stage discharge to assure that flow through the first stage is greater than the value wherein the internal recirculation occurs. Thus, the pump is capable of circulating a substantially greater amount of liquid through the first stage of the pump when the demand volume at the pump discharge is substantially less than the design value.

40379850, Jul 26, 1977

May 20, 1976

5/688156

Igor J. Karassik - Maplewood NJ
Charles H. Thaw - Morristown NJ

Worthington Pump, Inc. - Moutainside NJ

F01D 1100
F04D 2908
F01D 1108

415175

A flushing liquid system for an improved wearing ring in a centrifugal pump which wearing ring has spaced flushing liquid inlet and outlet chambers, has a first control assembly for supplying flushing liquid to the flushing liquid inlet chamber and a second control assembly for returning or draining at least a portion of the flushing liquid through the flushing liquid outlet chamber, with respective first and second control assemblies either having a predetermined setting or operatively responsive to signals from sensory devices for sensing at least one or more operating conditions of the centrifugal pump so that the operation of the first and second control devices can act to minimize flushing liquid requirements of the wearing ring and minimize dilution by the flushing liquid of the process fluid or mixture being pumped by the centrifugal pump. Additionally, the improved wearing ring for use in said flushing liquid system having a first groove on the outer surface thereof operative to form the flushing liquid inlet chamber connected to the source of flushing liquid, a second groove on the outer surface of the wearing ring disposed a spaced distance from said first groove operative to provide the flushing liquid outlet chamber, a plurality of first and second passages to communicate the respective first groove and second groove with the leakage joint formed by said wearing ring with the impeller for said centrifugal pump, said first groove and second groove operative to permit at least a portion of the flushing liquid delivered from said first groove to be returned or drained through the second groove. Additionally, means formed in the leakage joint between the improved wearing ring and the impeller of the centrifugal pump to resist axial flow of the process fluid being pumped by the centrifugal pump into the leakage joint from either direction.