In the illustrated self-contained,...

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Question 1 of 20290bhfbVeqw5OglF2xCV

In the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducing valve, what statement is true concerning the pilot and main valves? Illustration GS-0044

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Question 1 of 20

290bhfbVeqw5OglF2xCV

In the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducing valve, what statement is true concerning the pilot and main valves? Illustration GS-0044

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🔍 Key Concepts

• Upward vs downward seating – the direction the valve disc must move to press firmly against its seat and stop flow • How a pilot-operated pressure-reducing valve works: the small pilot valve first senses/controls outlet pressure, which then moves the larger main valve piston • The relative position of the seat and the moving disc/piston for both the pilot valve (upper, small) and the main valve (lower, large) in the cross‑section

💭 Think About

• On the pilot valve, is the seat located above or below the moving valve element? In which direction would that element have to move to close tightly and shut off the control flow? • On the main valve, look at the big piston and its stem over the inlet throat: when the valve closes, does the plug move toward the inlet passage or away from it? Is that an upward or downward movement in the drawing? • Think about the springs: when the valve is in the no‑flow (closed) position, are they pushing the pilot and main elements toward or away from their seats, and in which direction does that force act?

✅ Before You Answer

• Trace the inlet steam path from the INLET arrow to the first restriction at the main valve seat; identify on the drawing exactly where the main valve disc touches the seat when closed • For the pilot valve, visually locate the small seat ring and the matching plug; confirm whether the plug must move up or down to contact that seat surface fully • Before picking a choice, be sure you can state for yourself: ‘Pilot element closes by moving ___; main piston/plug closes by moving ___’ and match that with the answer options

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Question 1 of 20290bhfbVeqw5OglF2xCV

In the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducing valve, what statement is true concerning the pilot and main valves? Illustration GS-0044

Back

Question 1 of 20

290bhfbVeqw5OglF2xCV

In the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducing valve, what statement is true concerning the pilot and main valves? Illustration GS-0044

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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