The pneumatic propulsion control system used...

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Question 1 of 2066636eef28f7522a1c5200b7

The pneumatic propulsion control system used on your anchor-handling supply vessel uses a diaphragm-operated relay valve as shown in the illustration. Periodically, the valve is to be disassembled for cleaning and inspection. What statement best describes the proper method for servicing the in-line strainers? Illustration MO-0052

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Question 1 of 20

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🔍 Key Concepts

• Pneumatic control systems require dry, clean air and corrosion-free internal parts. • Fine in-line strainers/screens can be damaged or deformed by excessive air pressure when drying. • Use of water vs. non-flammable solvent for cleaning precision pneumatic components and the risk of rust/contamination.

💭 Think About

• In a pneumatic relay valve like the one shown, what would happen inside the valve body if any moisture remained in or around those fine mesh strainers when the system is pressurized and exposed to temperature changes? • Looking at how small and delicate the strainers appear in the illustration, how might very high pressure air affect their shape or force particles deeper into the system instead of out of it? • Between water with soap and a non-flammable solvent, which is more likely to leave residue or promote corrosion in a steel or alloy pneumatic valve body and screens?:

✅ Before You Answer

• Decide whether water is acceptable inside precision pneumatic components that must stay dry and corrosion‑free. • Decide whether high-pressure air is safe for delicate mesh strainers, or if low pressure would be safer to avoid damage. • Confirm that the cleaning agent should be non-flammable and non-residue forming to avoid hazards in a compressed air system.

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