The device shown in the illustration is...

Question 1 of 270705eccefa1bacbc34ba4d47661

The device shown in the illustration is opened by force as provided by __________. See illustration MO-0066.

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Question 1 of 27070

The device shown in the illustration is opened by force as provided by __________. See illustration MO-0066.

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🔍 Key Concepts

• Identify which part of the device actually MOVES to open the valve (look at the piston, stem, and spring). • Compare how spring pressure is usually used (to close a valve) versus how fluid or air pressure is used (to open a valve). • Think about what the small side connection labeled near the upper piston would carry: gas under pressure or oil under pressure, and whether it would be scavenging air or another type of pressure.

💭 Think About

• In the illustration, when the valve opens, is it being pushed open by the coil spring or pushed open AGAINST the coil spring? • Does the line coming into the upper cylinder of the right‑hand device look like it would be carrying liquid (hydraulic) or air (pneumatic), and is there anything in the drawing that ties it to the scavenging air system? • On large diesel engines, which medium typically provides the FORCE to open this type of valve, and which element (spring or fluid/air) is mainly for closing and sealing it when not in use?

✅ Before You Answer

• Be sure you can state clearly which direction the spring is trying to move the valve (open or closed). • Confirm what system that side connection would realistically be piped to: starting/control air, scavenging air, or oil/hydraulic system. • Before choosing, eliminate any option that would normally be used only for CLOSING or only found in a different engine system than the one shown in MO-0066.