2. The heat transfer oil pump needs to be warmed up before starting, and the cold oil pump is not needed. Pumps have different models. The hot oil pump is indicated by the letter R and the cold oil pump is indicated by J.
3, heat transfer oil pump materials used carbon steel, alloy steel, while the cold oil pump can be cast iron. The temperature of the pump medium is different. Below 200 degrees is a hot oil pump (200-400) with a cold oil pump (20-200) above 200 degrees.
4, the gap of the heat transfer oil pump ring is larger. The cold oil pump is smaller. In the pumping state, the hot oil pump needs to be warmed up, and the cold oil pump does not need to be warmed up.
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