If the controlled system temperature...

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Question 1 of 205eccefa5bacbc34ba4d487c5

If the controlled system temperature downstream of the valve shown in the illustration, decreases below the set point, which of the listed actions will occur? See illustration GS-0045.

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Question 1 of 20

5eccefa5bacbc34ba4d487c5

If the controlled system temperature downstream of the valve shown in the illustration, decreases below the set point, which of the listed actions will occur? See illustration GS-0045.

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🔍 Key Concepts

• Temperature control valve operation – what should the valve do when the sensed temperature is TOO LOW relative to set point? • Relationship between bellows/sensing element movement, stem C, and power piston H in the illustration. • How spring forces and fluid pressure interact to move valve plug D toward open or closed position.

💭 Think About

• Trace the sequence: if downstream temperature falls, does the controller try to increase or decrease flow through the valve? Then, which direction must valve D move to accomplish that? • Looking at the linkages, if valve D needs to open more, what direction must stem C move, and what does that imply for power piston H and spring F? • Consider which component resists motion (spring) and which one is moved by control pressure (piston). When temperature error changes sign, which one is being compressed or relaxed?

✅ Before You Answer

• Be clear on whether this valve is fail-close or fail-open with loss of control pressure; that helps you see which movement corresponds to increasing flow. • Verify the mechanical connection: is stem C directly or indirectly connected to valve plug D through the linkage at J and E? • Check which way spring F is oriented: does compressing it tend to push valve D toward open or closed? This will rule out at least two of the options.

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Question 1 of 205eccefa5bacbc34ba4d487c5

If the controlled system temperature downstream of the valve shown in the illustration, decreases below the set point, which of the listed actions will occur? See illustration GS-0045.

Back

Question 1 of 20

5eccefa5bacbc34ba4d487c5

If the controlled system temperature downstream of the valve shown in the illustration, decreases below the set point, which of the listed actions will occur? See illustration GS-0045.

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

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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