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Negative feedback control needed for gas flow controller

I'm an engineering student, and we're working on a design project that requires steady oxygen and nitrogen flow. We're using flow controllers to maintain a constant pressure. I need a LabVIEW VI that will sample the pressure at certain intervals and then, if there are variations, return the value to the desired pressure. I don't know that much about LabVIEW, so does anyone have suggestions on how I could do this? I don't need DAQ help now because that will be added later. Just suggestions on how to keep the value constant. Thanks!
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a PID control loop should do it

There is a pid example that ships with LabVIEW. Search the LabVIEW examples for PID.
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