When piloted by a small amount of control...

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Question 1 of 205eccefa1bacbc34ba4d47750

When piloted by a small amount of control air, the pneumatic relay valves, shown in the illustration, will provide a large flow of air from a separate source. The flow will stop when the control pressure is vented through the port numbered __________. See illustration MO-0052.

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🔍 Key Concepts

• Control air (pilot) vs. main air supply in a relay valve • How the valve moves between applied and released positions in Fig. A and Fig. B • Which port connects to the vent/exhaust path to atmosphere when the control pressure is removed

💭 Think About

• In Fig. A (applied), trace which port brings in the small pilot air that pushes on the diaphragm or piston. Which port does that air use to reach the top chamber? • In Fig. B (released), follow that same pilot-air passage and see where it opens to atmosphere when the diaphragm moves back. Which numbered port is now clearly connected to the exhaust/vent path? • Compare which ports stay connected to large passages (main flow) and which one only handles the small pilot air and its exhaust.

✅ Before You Answer

• Be sure you can identify which port feeds the control chamber above the diaphragm/piston • Confirm which port in the released view clearly connects to an open exhaust cavity (often shown with open space or to the side of the valve body) • Verify that the port you pick is not the main supply or delivery port; it should strictly be associated with the pilot/vent function.

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