A process control system includes a storage chamber, a fuel cell in fluid communication with the storage chamber via a feed line, a suction dampening drum in fluid communication with the fuel cell via a product line, a compressor in fluid communication with the suction dampening drum and the storage chamber, a recycle line disposed between the feed line and the product line, and a pressure controller disposed in the recycle line. When the fuel cell is in an electrolysis mode, the pressure controller may be operated to maintain a minimum pressure level inside the drum.
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