Referring to the illustrated impulse steam trap, what would be the effect of threading the control cylinder "E" upward out of the trap body? Illustration GS-0002

Correct Answer: Option A — The clearance between the reverse taper of the control cylinder's inner wall and the periphery of the valve disk will decrease, and as a result, the pressure drop across the periphery of the valve disk will increase.

Threading the control cylinder upward increases the restriction between the cylinder wall and the valve disc periphery. This tighter clearance forces a greater pressure drop across the disc as fluid escapes. This increased pressure drop is essential for the impulse trap's operation, ensuring the disc remains seated during the cycle.