homogenizing Driving assembly:House is made of grey cast iron HT200, and crank shaft, connecting rod, and gears are made of ductile cast iron. Plunger:the 4th generation stainless alloy(PH-type). Check valve:the 4th generation stainless alloy (GrMoFr),abrade-resisting and impact-resisting. Pump block: stainless steel. Plunger sealing:X4310 and PP spacer with heat-proof reaching 150°C. Homogenizing valve: the 3rd special stainless alloy; All the above-mentioned material are according with sanitary rules and suitable for CIP cleaning.