High - low temperature circulation pumps are essential pieces of equipment in many industries, such as chemical manufacturing, pharmaceutical production, and scientific research. They are designed to circulate heat - transfer fluids at both high and low temperatures to maintain precise temperature control in various processes. However, improper shutdown of these pumps can lead to significant damage, including mechanical wear, damage to seals, and even failure of the pump motor. Here are some guidelines and real - world examples on how to shut down high - low temperature circulation pumps correctly.