Gentle pumping action enables Series DW to flow delicate products at rates up to 1,600 gpm, with minimum damage to particles. Optional thermal jackets heat or cool pump chamber prior to product entry. This prevents even minor temperature changes which can cause media damage. Rotor tips and grooves in piston rotor design allow pump to run without pulsations when handling viscous products. Pump meets 3 A sanitary standards and FDA requirements for all seal materials.