Quattroflow® is the leading global manufacturer of quaternary (four-piston) diaphragm pumps designed for critical applications in the biopharmaceutical industry. The Quattroflow® pump's method of operation allows it to convey shear-sensitive aqueous solutions and biological products gently, safely and reliably. Quattroflow® is part of PSG®, a Dover company, and headquartered in Duisburg, Germany.