Patent ID: 8348633

Claim:
A stability valve assembly, comprising: a centrifugal pump; and a valve downstream of the centrifugal pump and having a valve member that is movable along a valve axis within a valve body to control a fluid flow from the centrifugal pump, the valve member having a first orifice connecting a valve inlet to a valve chamber, having at least one second orifice connecting a valve outlet to the valve chamber, a reference pressure upstream of the centrifugal pump applying pressure to a stepped portion of the valve member such that an amount of negative feedback provided by the valve assembly is proportional to a rotational speed of the centrifugal pump wherein the amount of negative feedback provided by the valve assembly is proportional to a rotational speed of the centrifugal pump such that a pressure of the valve inlet is proportional to a square of a ratio of actual centrifugal pump speed to a reference centrifugal pump speed.