The inlet of the recovery pump should include?

• A. A filter
• B. A pressure regulator
• C. A relief valve
• D. A check valve

Answer: (A)

The main idea is protecting the recovery pump by keeping debris out of its intake. When you pull refrigerant from a system, the lines can carry metal shavings, rust, and other particulates that can harm the pump’s impeller and seals. A filter at the pump inlet traps these contaminants before they enter the pump, helping maintain proper suction, reduce wear, and keep the unit operating reliably.

The other options don’t fit the purpose of protecting the pump. A pressure regulator at the inlet would alter suction pressure rather than shield the pump from debris. A relief valve is a safety device used on the discharge side to prevent overpressure, not something you’d place on the inlet. A check valve on the inlet could block flow or complicate startup rather than protect the pump. So filtering the inlet is the best choice to safeguard the recovery process.