Which of the following safety/control mechanisms are incorporated into a modern continuous HTST milk pasteurization plant?
Options:
(A) Flow Diversion Valve ($FDV$) triggered by temperature sensing probe at the end of holding tube
(B) Booster pump located on the pasteurized milk side to maintain higher pressure than raw milk
(C) Metering / timing pump with positive displacement action
(D) Direct contact open flame heating burner
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
HTST safety features:
• Flow Diversion Valve diverts sub-pasteurized milk back to raw milk balance tank if temperature drops below $71.7^\circ\text{C}$ (A).
• Pressure differential maintains higher pressure on pasteurized side than raw milk side so any leak moves pasteurized into raw, never contaminating pasteurized milk (B).
• Positive displacement timing pump establishes certified uniform flow rate through holding tube (C).
Milk is heated indirectly with hot water/steam, never open flame (D is FALSE).