1. The model of hot oil pump is generally indicated by the letter R, and the model of cold oil pump is indicated by the letter J.

2. The clearance of the hot oil pump mouth ring is large, and the cooling pump is small.

3. The pump body of the hot oil pump adopts the vertical segmented type, while the pump body of the cold oil pump adopts the horizontal split type. Some hot oil pumps have a structure to prevent the centerline of the pump body from moving.

4. Generally, the sealing mechanism of hot oil pump is filled with sealing oil, while the cold oil pump is not.

5. The hot oil pump is made of carbon steel and alloy steel, while the cold oil pump can be made of cast iron.

6. The support, bearing box and packing box mechanical seal of the hot oil pump need to be cooled with water, while the cold oil pump can not be used.

7. The hot oil pump needs to be preheated before starting, while the cold oil pump is unnecessary.

8. Cold oil pump with operating temperature below 200 ℃ and hot oil pump with operating temperature above 200 ℃