What is an ARV valve?

What is an ARV valve?

An automatic recirculation valve (ARV) diverts fluid flow from the discharge of a centrifugal pump through a bypass circuit to ensure a minimum flow rate is maintained. This is vital for all variable-flow centrifugal pumps. While the primary function of an ARV is to protect a centrifugal pump from cavitation, overheating and running dry, the valve also serves several other functions.

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EDVC VALVE CO.,LTD.is a specialized in valve manufacturing enterprise with more than 15 years of history.We main produce Top Entry Ball Valve, Fully Welded Ball Valve, Arc Valve, Aluminum Bronze Valve, Automatic Recirculation Valve, Orbit Ball Valve, Safety Valve, Globe Valve, Tilting Disc Check Valve and Rising Stem Ball Valve etc.

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ARV valve Operating principle

The ARV is a three-way valve that typically incorporates a spring-loaded check valve, a hollow spindle and a letdown unit. The outlet to a process stream remains fully open when the process stream demands fluid flow. As the outlet flow rate diminishes, the differential pressure across the spring-loaded check valve is reduced and the check valve begins to close. When this occurs the hollow spindle begins to open a pathway through a bypass circuit. When demand ceases the check valve is fully closed and the bypass circuit is fully open. The letdown unit, located in the valve port that feeds the bypass circuit, ensures that the outlet pressure is maintained at safe levels.

The additional functions of the ARV are that of a normal check valve as it is an effective backflow preventer and pulsation dampener. It also functions as a flow and pressure control valve, replacing the functions of a check valve, a control valve or bypass flow and feedback loop, as the preloaded spring of the check valve and the letdown unit are adjusted to maintain the predetermined flow rate through a variable flow centrifugal pump.

Frequently Asked Question

Do you have any question?

Operation of a ARV Valve. The heart of the recirculation valve is a main flow sensing check valve disc, which is flow sensitive, not pressure sensitive. The disc modulates to the demand for process flow at the same time helping ensure a minimum flow through the pump.

Automatic recirculation valves, sometimes referred to as pump protection valves or minimum flow valves are installed on the outlet of a centrifugal pump discharge line. Their purpose is to prevent the pump from overheating by ensuring that there is a minimum flow through the pump at all times.

Minimum Flow or Automatic Recirculation Valves automatically protect centrifugal pumps during low load operation. As the pump's load drops below a preset flow rate, the valve's disc moves towards its seat and causes the bypass bush to open a bypass flow path. The pump minimum flow rate is thus reached and maintained.

The automatic circulation valve is self-contained and does not require manual operation. Automatic recirculation valve, also known as pump protection valve or minimum flow valve, is used for automatic recirculation of the minimum flow of the centrifugal pump to prevent damage to the centrifugal pump due to overheating, noise, and vibration under low load.

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