CENTRIFUGAL PUMP RECIRCULATION DIFFUSER

Assignee

Filed

Jul 23, 1974

Granted

Feb 1, 1983

Location

MD US

Abstract

A recirculation diffuser for centrifugal pumps that produces a continuousrising head capacity curve and at the same time reduces levels of impeller vane-frequency sound and other high level acoustic flow tones. The conventional vane diffuser in the pump casing at the periphery of the rotary impeller is modified by separating one of the side shrouds from the diffuser vanes thereby creating a recirculation flow path around the vanes from the outside high pressure to the inside low pressure side.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Dec 3, 1981

Rescinded

Never rescinded

Duration

44y 6mo — still active

This secrecy order has no recorded rescission date in USPTO records. The order may still be legally in force, or rescission data may not be publicly available.