Failure of the steam pressure reducing valve...

Failure of the steam pressure reducing valve...

Question 1 / 27070

Question 1 of 270705eccefa5bacbc34ba4d487ce

Failure of the steam pressure reducing valve to deliver proper steam pressure could be caused by __________. See illustration GS-0044.

Question 1 of 27070

Q

Failure of the steam pressure reducing valve to deliver proper steam pressure could be caused by __________. See illustration GS-0044.

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🔍 Key Concepts

• Operation of a self-actuated steam pressure reducing valve shown in GS-0044 • Relationship between upstream (supply) pressure, valve spring setting, and controlled downstream pressure • Role of the diaphragm and pilot/auxiliary valve in sensing and controlling outlet pressure

💭 Think About

• Look at where the sensing line from the outlet connects to the underside of the diaphragm. How does a change in outlet pressure make the main valve open or close? • Which of the choices describes a condition that would prevent the valve from ever reaching the set outlet pressure, even if the valve were fully open and working correctly? • Which options actually describe parts of the normal control action (how the valve is supposed to work) rather than a fault or failure?

✅ Before You Answer

• Identify on the illustration which side of the diaphragm sees reduced (downstream) pressure and which side sees spring force. • Decide whether frictional losses downstream change the pressure right at the valve outlet, or only farther in the line. • Ask yourself: if the supply pressure entering at the inlet dropped, could the valve still deliver the same reduced pressure at the outlet, even wide open?