POLY - Discharge Gear Pump POLY high-pressure gear pump for the discharge of medium to high viscosity media from the reactor. The extra large inlet opening guarantees an even flow of product to the gearwheels even under vacuum or extremely low NPSH conditions. Offered with either a round inlet port, by means of which the suction flange of the pump is directly connected to the outlet flange of the reactor or as a low NPSH version, where the pump is connected between the pump and reactor flanges, in order to achieve an even larger and shorter inlet port. Technical Features Housing Non-alloyed and alloyed steels · cast steel · with optional surface coating Gears Nitrated steel · tool steel · special steel · with optional surface coating · helical gearing · herringbone gearing Friction Bearings Tool steel · NiAg (nickel-silver) · Al-bronze · special materials · with optional surface coating Shaft Seals (Vacuum) viscoseal · stuffing box · combination of viscoseal and stuffing box · double-action, buffered mechanical seal Heating Systems Heat transfer oil · steam Operating Parameters Viscosity up to 40000 Pas Temperature up to 350°C (662°F) Inlet pressure Vacuum to max. 40 bar (580 psig) Differential Pressure Up to 250 bar (3225 psig) The values listed are maximum values and must not coincide under certain circumstances. Pump Sizes From 22/22 (4.7 cm3/U - 10 kg/h) up to 280/280 (12,000 cm3/U - 30,000 kg/h). Intermediate sizes, with wider gear wheels for lower differential pressure, are available as standard, e.g. 152/254 (3,170 cm3/U).