In a direct cylinder admission air starting...

Question 1 / 2066636eef28f7522a1c51fa3a

Question 1 of 2066636eef28f7522a1c51fa3a

In a direct cylinder admission air starting system, once the engine begins to fire, the air starting check valve illustrated, is closed by __________. Illustration MO-0107

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Question 1 of 20

66636eef28f7522a1c51fa3a

In a direct cylinder admission air starting system, once the engine begins to fire, the air starting check valve illustrated, is closed by __________. Illustration MO-0107

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🔍 Key Concepts

• Operation of a direct cylinder admission air starting valve during start and after firing • Function of a non-return (check) valve in a starting air line • Forces acting on the valve disc: spring force, starting air pressure, and cylinder pressure

💭 Think About

• When the engine is cranking on starting air, which direction is the force from the starting air acting on the valve, and does that tend to open or close it? • After the cylinder fires and its internal pressure rises above the starting air manifold pressure, which forces now act to push the valve back onto its seat? • Looking at the illustration, do you see any cams, bellows, or external mechanisms connected to the valve element, or is it operated purely by pressure and a spring?

✅ Before You Answer

• Confirm that a check valve in a starting air system must automatically prevent backflow of hot combustion gases into the starting air manifold. • Verify from the diagram what element is trying to keep the valve on its seat even when there is no pressure (look for the spring). • Make sure the closing force you select could exist right at the end of starting, when starting air is being removed and the cylinder has just begun firing.

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Question 1 of 20

In a direct cylinder admission air starting system, once the engine begins to fire, the air starting check valve illustrated, is closed by __________. Illustration MO-0107

the spring force and cylinder pressure

a pneumatic bellows assembly

a valve actuating cam

the starting air pressure

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Question 1 / 2066636eef28f7522a1c51fa3a

Question 1 of 2066636eef28f7522a1c51fa3a

In a direct cylinder admission air starting system, once the engine begins to fire, the air starting check valve illustrated, is closed by __________. Illustration MO-0107

Back

Question 1 of 20

66636eef28f7522a1c51fa3a

In a direct cylinder admission air starting system, once the engine begins to fire, the air starting check valve illustrated, is closed by __________. Illustration MO-0107

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