Suppose the illustrated pneumatically operated, diaphragm actuated control valve is used to control the fuel oil outlet temperature of a steam-heated heavy fuel oil heater by controlling the steam flow. What would be the result if the control diaphragm became ruptured? Illustration GS-0051

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Accepted Answer

The valve would fail in the fully open position, most likely resulting in a high fuel oil temperature alarm condition.

Answer

It is not possible to predict how the valve would respond to a ruptured diaphragm.

Answer

The valve would fail in the fully closed position, most likely resulting in a low fuel oil temperature alarm condition.

Answer

The valve would fail in the exact position just before the control diaphragm ruptured. The fuel temperature will fluctuate with changes in fuel demand.

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