Referring to the illustrated pneumatically...

Question 1 / 2066636eee28f7522a1c51f11a

Question 1 of 2066636eee28f7522a1c51f11a

Referring to the illustrated pneumatically operated diaphragm actuated control valve, what statement is true? Illustration GS-0051

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Question 1 of 20

66636eee28f7522a1c51f11a

Referring to the illustrated pneumatically operated diaphragm actuated control valve, what statement is true? Illustration GS-0051

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🔍 Key Concepts

• Examine the number of separate plug/disc surfaces attached to the valve stem in the flow passage (the shaded flow area). • Determine where the seat rings are located relative to those plug/disc surfaces – each seat needs a matching disc. • Think about the direction the stem must move to shut off flow at each seat: does the disc move upward into the seat, or downward into it?

💭 Think About

• Count how many distinct sealing edges you can see along the stem that could actually stop the flow from inlet to outlet. • Trace the inlet flow path (from the INLET arrow to the OUTLET arrow) and identify where the flow would be blocked when the valve is fully closed. • Look at the lowest part of the valve body: when the actuator pushes the stem down, does the plug move into or away from the seat at the bottom? What about any plug higher up?

✅ Before You Answer

• Verify exactly how many discs/plug faces on the stem actually contact a machined seat ring. • Confirm the orientation of each seat’s sealing surface (facing up or facing down) and the corresponding motion of the disc to close the valve. • Make sure you are not counting guides or spacers on the stem as discs; only parts that form a tight seal with a seat ring should be treated as discs.

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Question 1 of 20

Referring to the illustrated pneumatically operated diaphragm actuated control valve, what statement is true? Illustration GS-0051

The control valve has a single disc which is upward seating.

The control valve has a single disc which is downward seating.

The control valve has two discs which are both upward seating.

The control valve has two discs which are both downward seating.

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Question 1 / 2066636eee28f7522a1c51f11a

Question 1 of 2066636eee28f7522a1c51f11a

Referring to the illustrated pneumatically operated diaphragm actuated control valve, what statement is true? Illustration GS-0051

Back

Question 1 of 20

66636eee28f7522a1c51f11a

Referring to the illustrated pneumatically operated diaphragm actuated control valve, what statement is true? Illustration GS-0051

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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