How is the compressor safety head best described?

• A. A backflow preventer
• B. A spring on the valve plates
• C. A high-pressure relief valve on discharge
• D. A thermal fuse

Answer: (B)

The compressor safety head is best described as the spring mechanism that sits on the valve plates to return and hold them closed. In a reciprocating compressor, the suction and discharge valves must open and close with each stroke, and the springs on the valve plates provide the closing force and dampen valve motion. This prevents valve flutter or hammering at high speeds and helps ensure reliable, proper sealing so the compressor can build and maintain the intended pressures. It’s not a backflow preventer, a discharge relief valve, or a thermal fuse—the safety head’s role is specifically to manage valve seating through springs.