Sanitary Pressure Control Across a Wide Range of Flow Rates

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The Equilibar® FD Series Sanitary back pressure regulators have a high turndown ratio which offers benefits in biopharmaceutical applications. In traditional sanitary valves, the ratio of the maximum flow rate to the minimum controllable flow rate, called the turn down ratio, is often limited.

In this video, Ryan Heffner demonstrates how an Equilibar FDO8 sanitary back pressure regulator (BPR) can control pressure across a flow rate range from 0.008 gpm to 30 gpm, a sample of the total range. The Equilibar FDO8 precisely controls the inlet pressure at 20psi throughout the demonstration. The setpoint of the FDO8 is controlled with a fast-acting electronic pilot pressure regulator.

The FDO8 works in conjunction with an electronic pilot pressure regulator (EPR) and a pressure transducer (PT) in a closed-loop control fromat. A proportional-integral-derivative (PID) controller monitors the pressure transducer and sends a signal to the EPR to adjust the pilot pressure to bring the pressure under control.

The Equilibar FDO8 regulator is able to control pressure across a wide range of flow rates because it has a much higher resolution than traditional back pressure regulator designs. The Equilibar uses a flexible diaphragm as the only moving part. The diaphragm acts as both the pressure sensing element and the flow control valve by directly sealing against a field of parallel orifices.

If you would like to learn more about Equilibar hygienic back pressure valves, click here: https://www.equilibar.com/back-pressure-regulators/severe-services/sanitary/

This video was produced in Equilibar’s Fletcher, North Carolina engineering laboratory with Ryan Heffner, Senior Design Engineer.