Question

In pasteurization process, if the product has been properly pasteurized, it is forwarded through unit,while that which is unpasteurized is diverted into the balance tank for reprocessing.The valve used for this purpose is

• A. Q\(_{10}\) valve
• B. F\(_{0}\) valve
• C. Flow dispersion valve
• D. Flow diversion valve

Hint:

The name "Flow Diversion Valve" is very descriptive of its function: it {diverts} the {flow} of milk if it's not safe. This makes it easy to remember. It is the heart of the HTST pasteurizer's safety system.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The question describes a critical safety component of a High-Temperature Short-Time (HTST) pasteurizer system. This component ensures that only milk that has been heated to the correct temperature proceeds for cooling and packaging.
Step 2: Detailed Explanation:
In an HTST system, milk flows continuously. A temperature sensor is placed at the end of the holding tube. This sensor is connected to a special three-way valve.
Flow Diversion Valve (FDV): This is the correct name for the valve. If the sensor detects that the milk temperature is at or above the legal minimum (e.g., 72°C), the FDV stays in the "forward flow" position, allowing the milk to continue to the cooling section. If the temperature drops below the set point, the FDV automatically switches to the "diverted flow" position, sending the under-processed milk back to the raw milk balance tank to be re-pasteurized. This is a fail-safe mechanism.
Q\(_{10}\) and F\(_{0}\) valve: Q\(_{10}\) and F\(_{0}\) are terms related to the kinetics of chemical reactions/microbial death with temperature, not types of valves.
Flow dispersion valve: This is not a standard term for the safety valve in a pasteurizer.
Step 3: Final Answer:
The safety valve that diverts under-pasteurized milk back for reprocessing is called the Flow Diversion Valve (FDV).