HPM Series Automatic Recirculation Valve
An automatic recirculation valve is a multifunctional valve whose primary purpose is to ensure that a pre-determined minimum flow is assured through a centrifugal pump at all times. This is important as centrifugal pumps suffer from over heating and cavitation and can be permanently damaged if they run dry.

ARC valve is the abbreviation for Automatic Recirculation Control valve. The function of this valve is the same as that of a AR valve.

Description

HPM Series Automatic Recirculation Valve

Introduction
The HPM Series Automatic Recirculation Valve was developed for high pressure centrifugal pump protection. Popular applications include
boiler feed water, petroleum fluids, and steel mill hot strip descale water. The HPM provides economical and reliable protection against low and
reverse flow. By combining the functions of main line check valve, flow sensing element, bypass flow control, bypass pressure reduction, pulsation dampener and bypass line check valve, the valve eliminates at least seven components necessary with a conventional system.
The valve operates without air or electric power and is easily installed with three connections.
Principle of Operation
The valve is installed on or close to the pump discharge, just as an ordinary check valve would be. Upon pump startup and without process demand, the bypass is completely open, recirculating the necessary minimum flow. Once process demand starts, the spring loaded
disc is lifted and held in position by flow demand. Until main flow demand exceeds recommended minimum flow, the valve will modulate. As the main flow demand increases beyond recommended minimum flow, the bypass will close and all flow will go to the process.
One Valve–Many Functions
The HPM Series Automatic Recirculation Valve is the one
valve that provides at least five essential functions.
Following are those functions:

1. Check Valve Disc prevents reverse flow and positions the bypass for open, closed or modulating flow by detecting the process flow demand.
2. Bypass modulates open when main flow demand falls below the recommended minimum pump flow. Multiple stage pressure reduction prevents flashing/cavitation.
3. Flow Straightener eliminates turbulent discharge. Fluid exits valve as a spray rather than a jet. Reduces erosive wear on downstream piping.
4. Integral Pulsation Dampener protects system from waterhammer if sudden changes in flow demand occur.
5. Integral Check Valve in bypass prevents reverse flow when bypass is routed into a common return line.

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