Assuming that the flow is from left to right...

Question 1 / 2066636eee28f7522a1c51e549

Question 1 of 2066636eee28f7522a1c51e549

Assuming that the flow is from left to right on the illustrated pneumatically operated diaphragm actuated control valve, what statement is true? Illustration GS-0051

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Question 1 of 20

66636eee28f7522a1c51e549

Assuming that the flow is from left to right on the illustrated pneumatically operated diaphragm actuated control valve, what statement is true? Illustration GS-0051

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🔍 Key Concepts

• Trace the flow path from inlet to outlet and note which chambers around each disc are at inlet pressure vs outlet pressure. • Understand how a double-ported (double-disc) globe valve uses two discs to either balance hydraulic forces or use pressure to assist motion. • Relate pressure acting surface (upper vs lower face of each disc) to whether forces on the stem cancel (hydraulic balance) or add (hydraulic assist).

💭 Think About

• For the top disc, which side (upper or lower) is directly exposed to the incoming high-pressure flow from the left? Do the same for the bottom disc. • If inlet pressure pushes the top disc one way and the bottom disc the opposite way, what does that do to the net force on the stem? If both push the same way, what does that suggest? • Look at the cavities above, between, and below the discs: which of those spaces appear to be in open communication with the inlet passage and which with the outlet passage?

✅ Before You Answer

• Verify which faces of the discs are surrounded by the shaded region marked as inlet flow and which are surrounded by the outlet side. • Check whether the areas that see inlet pressure on the two discs are opposite each other along the stem (tending to cancel) or oriented in the same direction (tending to add). • Confirm whether the design goal of this type of control valve, as drawn, is usually to keep the stem force small and independent of line pressure (hydraulic balance) rather than to use line pressure as an assist.

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Question 1 of 20

Assuming that the flow is from left to right on the illustrated pneumatically operated diaphragm actuated control valve, what statement is true? Illustration GS-0051

Inlet pressure acts on the upper surface of the top disc and the lower surface of the bottom disc for the purpose of achieving hydraulic balance so that inlet pressure does not influence the valve position.

Inlet pressure acts on the lower surface of the top disc and the upper surface of the bottom disc for the purpose of achieving hydraulic balance so that inlet pressure does not influence the valve position.

Inlet pressure acts on the upper surface of the top disc and the upper surface of the bottom disc for the purpose of achieving a hydraulic assist to aid in valve closing.

Question 1 / 2066636eee28f7522a1c51e549

Question 1 of 2066636eee28f7522a1c51e549

Assuming that the flow is from left to right on the illustrated pneumatically operated diaphragm actuated control valve, what statement is true? Illustration GS-0051

Back

Question 1 of 20

66636eee28f7522a1c51e549

Assuming that the flow is from left to right on 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

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

Quick actions

— No credit card needed