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

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

3. The pump body of the hot oil pump is vertical sectional type, while the pump body of the cold oil pump is horizontal split type. Some hot oil pumps have a structure to prevent the center line of the pump body from moving.

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

5. Carbon steel and alloy steel are used for hot oil pump, while cast iron can be used for cold oil pump.

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 the same as the cold oil pump, and the cold oil pump is unnecessary.

8. The cold oil pump is used at a temperature below 200 ° C, and the hot oil pump is used at a temperature above 200 ° C.