RICHARD L. JONES, INC
Steam & Condensate Specialist Since 1981
SCHROEDAHL AUTOMATIC RECIRCULATION SYSTEMS
Centrifugal Pump Minimum Flow Protection
A centrifugal pump can overheat and be damaged when flows are less then the minimum amount specified by the manufacture. The primary function of a pump protection system is to maintain a minimum flow thru the pump at low loads. This flow is allowed to pass thru the pump and diverted into a bypass line so that the process system will not be affected. This bypass flow is typically returned to the pump suction supply side of the system.
Two types of systems are commonly used to fulfill this function, a Conventional Feedback Control System or a Self-Contained Automatic Recirculation Valve.
The Conventional Feedback Control System
The Self-Contained Automatic Recirculation System
Key Components: (The Only Component)
Check Valve: The ARV has an integral main-line check valve, witch not only prevents reverse flow but also provides pump discharge pulsation dampening throughout the entire flow range.
Bypass Valve: The bypass control device located in the ARV is actuated directly from the movement of the main disc. The bypass valve is designed to handle the entire pressure drop from the pump discharge to the suction inlet pressure without additional let down valves.
The SCHROEDAHL Advantage
The advantages of the Schroedahl ARV as compared to a Conventional Feedback Control System make it east see why it is becoming the system of choice.
Note: Some applications may require a Schroedahl Anti-Flashing Device to be installed in the bypass line to protect the downstream piping.
Richard L. Jones, Inc.