Question:
Pressure gauge fluctuations in homogenizer may be caused by following reasons:
I. Badly worn pump valves and valve seats
II. Insufficient feed supply
III. Leaking plunger packing
IV. Low fat content in milk
Pressure gauge fluctuations in homogenizer may be caused by following reasons:
I. Badly worn pump valves and valve seats
II. Insufficient feed supply
III. Leaking plunger packing
IV. Low fat content in milk
I. Badly worn pump valves and valve seats
II. Insufficient feed supply
III. Leaking plunger packing
IV. Low fat content in milk
Show Hint
Pressure gauge fluctuations in a homogenizer indicate mechanical issues, such as worn valves, leaking seals, or an unstable product feed supply.
Updated On: Aug 7, 2026
- Only I and II are true
- Only I and III are true
- Only II and III are true
- Only I, II and III are true
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
The plunger pumps in homogenizers rely on seal integrity, valve seating, and a steady feed supply to maintain a constant operating pressure.
Mechanical wear or feed disruptions can cause pressure fluctuations, which can affect homogenization efficiency and damage the equipment.
Step 2: Detailed Explanation:
Let us analyze each of the potential causes of pressure fluctuations:
1. Badly worn pump valves and valve seats (I): The suction and discharge valves in the pump block must close quickly and seal completely to prevent backflow during the plunger strokes.
If these valves or their seats are worn, pitted, or chipped, liquid will leak back past the seat during the compression stroke.
This leakage causes a drop in pressure on that stroke, resulting in cyclic pressure fluctuations.
2. Insufficient feed supply (II): Plunger pumps are positive displacement pumps that require a constant volume of liquid.
If the feed supply is insufficient, the plunger cylinder may not fill completely during the suction stroke, creating a partial vacuum or drawing in air.
During the compression stroke, this trapped air collapses, causing sudden pressure drops and cavitation.
3. Leaking plunger packing (III): The packing seals prevent high-pressure milk from leaking out of the pump cylinder along the plunger shaft.
If this packing is worn or leaking, milk will escape during the compression stroke, reducing the pressure generated by that plunger and causing fluctuations.
4. Low fat content in milk (IV): The fat content of the milk affects its viscosity and physical properties, but it does not influence the mechanical pressure generated by the pump.
Therefore, only reasons I, II, and III are valid causes of pressure fluctuations.
Step 3: Final Answer:
Consequently, only reasons I, II, and III are true.
The plunger pumps in homogenizers rely on seal integrity, valve seating, and a steady feed supply to maintain a constant operating pressure.
Mechanical wear or feed disruptions can cause pressure fluctuations, which can affect homogenization efficiency and damage the equipment.
Step 2: Detailed Explanation:
Let us analyze each of the potential causes of pressure fluctuations:
1. Badly worn pump valves and valve seats (I): The suction and discharge valves in the pump block must close quickly and seal completely to prevent backflow during the plunger strokes.
If these valves or their seats are worn, pitted, or chipped, liquid will leak back past the seat during the compression stroke.
This leakage causes a drop in pressure on that stroke, resulting in cyclic pressure fluctuations.
2. Insufficient feed supply (II): Plunger pumps are positive displacement pumps that require a constant volume of liquid.
If the feed supply is insufficient, the plunger cylinder may not fill completely during the suction stroke, creating a partial vacuum or drawing in air.
During the compression stroke, this trapped air collapses, causing sudden pressure drops and cavitation.
3. Leaking plunger packing (III): The packing seals prevent high-pressure milk from leaking out of the pump cylinder along the plunger shaft.
If this packing is worn or leaking, milk will escape during the compression stroke, reducing the pressure generated by that plunger and causing fluctuations.
4. Low fat content in milk (IV): The fat content of the milk affects its viscosity and physical properties, but it does not influence the mechanical pressure generated by the pump.
Therefore, only reasons I, II, and III are valid causes of pressure fluctuations.
Step 3: Final Answer:
Consequently, only reasons I, II, and III are true.
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