Cold pump and hot pump difference between the methods

1, the type of hot oil pump is generally indicated by the letter R, cold oil pump with the letter J table. 2, the use of temperature below 200 degrees Celsius cold oil pump, 200 degrees Celsius above hot oil pump. 3, the general hot oil pump seal seal oil seal, and the cold pump will not note. 4, hot oil pump body using vertical segmented, while the cold pump body with horizontal open. Some hot oil pump to prevent movement of the center line of the pump structure. 5, hot pump mouth ring gap larger. Cold pump is smaller. 6, hot oil pump use more carbon steel, alloy steel, and cold oil pump can be cast iron. 7, hot oil pump need to warm up before starting, while the cold oil pump, the cold oil pump is unnecessary. 8, hot oil pump bearings, bearing boxes, packing box mechanical seals need water cooling, and cold pump can not be used.