Suppose the illustrated self-contained,...

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Question 1 of 205eccefa5bacbc34ba4d487d5

Suppose the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducing valve is part of a 600-to-150 psig reducing station. If there was an increase in demand for steam downstream, what statement correctly represents how the valve would initially respond? Illustration GS-0044

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🔍 Key Concepts

• Pilot-operated pressure-reducing valve action (pilot controls main valve, not line pressure directly). • Relationship between downstream pressure under the diaphragm and the adjusting spring above it. • How a drop vs. rise in downstream pressure would move the diaphragm and change the pilot valve opening.

💭 Think About

• When steam demand increases downstream, what happens first to the downstream pressure at the sensing line connected to the diaphragm chamber? • If the force from the spring stays the same but the pressure force on the underside of the diaphragm changes, does the diaphragm move upward or downward? • For the system to restore the set pressure after a drop, should the pilot valve move toward a more open or more closed position to make the main valve respond?:

✅ Before You Answer

• Confirm that an increase in demand initially causes a drop in downstream pressure, not a rise. • Identify which side of the diaphragm the spring is on and which side the sensed downstream pressure is on in the illustration. • Verify whether a downward diaphragm movement corresponds to the pilot valve opening or closing in this particular valve design.

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