Step 1: Calculating energy consumption -- Comparing the daily energy consumption, if the yield is reduced with the same raw material, then we judge initially that the gate valve leaks, resulting in increased energy consumption.
Step 2: Thermometer detection -- If a gate valve has leakage, the temperature of the adjacent pipeline will significantly increase or decrease.
Step 3: Using the "stethoscope" -- The stethoscope test is a very important step because we cannot be 100% sure whether the gate valve has leakage in the first and second steps. We can choose a screwdriver as a "stethoscope". Put the head end of the screwdriver perpendicular to the pipe and the other end to your ear, listen carefully and check if there is an abnormal hissing sound in the pipe. If there is, we can judge that the valve has leakage.