Differences between low pressure type and high pressure type busbottom gear pump

Because the reactor is mostly in vacuum, the gear pump is often directly connected to the bottom of the reactor by bolts to reduce the required NPSH. At this time, because the polymer also contains a large number of solvents, the material viscosity is not particularly high, about 150 000CP. The pump needs special design to adapt to the low pressure and high temperature resistance at the inlet, so as to offset the thermal expansion of steel at 200 ℃. Therefore, the inlet of the Pudi gear pump is designed as a conical large opening, which can help materials enter the pump. The jacket can heat the pump body with steam or heat medium. The low-pressure Pudi gear pump provided by Zhengzhou Batte can meet the requirements of the above working conditions.

In some processes, the polymer is pumped into the second reactor or tray tower, and the solvent is separated, leaving more viscous materials with viscosity up to 500 000CP and temperature up to 340 ℃. This requires another gear pump to extract the materials from the tower bottom. Because it is necessary to push the melt to other equipment with large pressure drop, and then enter the pelletizer, this gear pump needs to have a higher design than each pump to adapt to more extreme working conditions, and the higher pressure - the outlet pressure as high as 250kg is perfectly normal. Therefore, there must be tight and accurate clearance design between the moving parts of the melt pump. These clearances should be considered by the pump manufacturer for high temperature, high pressure and high viscosity The different thermal expansion coefficients of materials and the characteristics of non Newtonian fluid materials are calculated carefully. The high-pressure Busi gear pump provided by Zhengzhou Batte can well meet the above requirements. info@battemachinery.com