Alfa Laval SRU Rotary lobe pump Introduction The Alfa Laval SRU Rotary Lobe Pump is a reliable positive displacement pump for the gentle handling of sensitive process fluids. The pump is carefully engineered to provide reliable performance, trouble-free operation and superior energy efficiency for demanding applications. It is an excellent choice for duties that require contamination-proof pumps to meet high standards of hygiene, low-shear and low-pulsation operation. The pump is designed according to the most stringent hygienic design standards and with verified, effective Cleaning-in-Place. Applications The SRU Rotary Lobe Pump is designed for gentle handling of sensitive process fluids across the dairy, food, beverage, brewing, chemical, pharmaceutical, and home and personal care industries. Its smooth, low-shear pumping action makes the pump suitable for handling media of varying viscosities, whether low or high- from creams, gels, emulsions, and aerated mixtures to delicate cells and organic solids in suspension. The SRU Rotary Lobe Pump is available with 12 different pump head displacements based on six different gearbox modules to handle flow rates up to 106 m 3 /h and differential pressures up to 20 bar. Benefits • Consistent performance. • Minimal risk of contamination. • Low maintenance, increased process uptime. • Modular design for greater flexibility to configure exactly the right solution for specific process requirements. Standard design All media contacting steel components, like the rotor case, front cover, rotors and rotor nuts, are in W. 1.4404 (AISI 316L). The robust cast iron gearbox provides maximum shaft rigidity and easy oil seal replacement. The gearbox design is universal, which enables the flexibility of mounting pumps with the inlet and outlet ports in either a vertical or horizontal plane by changing the foot and its position. The standard Alfa Laval SRU Rotary Lobe Pump has tri-lobe rotors. Optional bi-lobe rotors for handling fluids containing large delicate solids are available. All rotors are available in three temperature ratings enabling the pump to be operated at maximum process temperatures of 158°F, 266°F and 392°F for both fluid pumped and CIP. Single, single flushed, and double mechanical shaft seals as well as packed gland, unflushed or flushed, are available. The Alfa Laval SRU can be supplied either as a bare shaft pump or mounted on a base plate complete with coupling, guard, gear motor and shroud for easy, plug-and-play installation. Working principle A gear train in the pump gearbox drives the rotors and provides accurate synchronization of the tri-lobe rotors. The movement of the counter-rotating rotors creates a partial vacuum that allows atmospheric pressure or other external pressures to force fluid into the pump chamber. As the rotors revolve, an expanding 168
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