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In valve operations, the down valve depends on what?

  1. Elevation of the system

  2. Oil temperature

  3. System pressure

  4. Valve position

The correct answer is: System pressure

The down valve in valve operations depends on the system pressure rather than the other options listed. This is because the system pressure is what ultimately controls the flow of liquid or gas through the valve. The elevation of the system, oil temperature, and valve position may all play a role in the overall valve operation, but they do not directly influence the function of the down valve. Therefore, options A, B, and D are incorrect as they do not accurately answer the question about what the down valve depends on.