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Why would a trap be losing steam if it was just replaced?

If the trap is blowing live steam, it could be due to: 1. The valve may not be seating properly due to scale or dirt being lodged in the trap or there may be worn or defective parts in the trap 2. The trap may have lost its prime—close inlet valve for a few minutes, and slowly open it back up. The trap should catch its prime. Prime loss is typically due to frequent or sudden drops in pressure.