4000 Series Rotary Gear Process Pumps offer a low cost alternative to the Tuthill heavy-duty circumferential piston pumps. Designed to handle liquids compatible with cast iron, the three basic styles have been developed to pump non-lubricating fluids, free of solids. Flows up to 250 l/min, pressures up to 33BARG. and temperatures up to 250°C. Series 4000 pumps have been successfully used for applications including inks, paints, refrigerants, solvents and low viscosity fuel oils.
4100 Series Capacities up to 17.5 L/min at pressures up to 33 BARG. Standard 3 bolt flange with mechanical seal. Available bareshaft with optional mounting foot. Close coupled units with standard AC motors, compact arrangements utilising flameproof motors. Baseplate options for high temperature applications, seal elastomers to suit fluid/temperature.
4200/4300 Series Capacities up to 250 l/min at 10 BARG. Series 4200 feature adjustable packed gland and a standard greased lubricator or tapping for gland flushing. Designed for direct drive, this unit is available with standard graphite or high temperature P.T.F.E. packing rings generally reserved for hot & sticky applications. Series 4300 feature mechanical seals with integral mounting foot for noncontaminated fluids.
4320 Series As 4100 to 4300 Series, except all wetted parts are toughened for handling abrasive or contaminated fluids.
Tuthill 4000 Series cast iron rotary geaar pumps employ the internal gear pumping principle. There are only two moving parts. Pumping action is based on a rotor, idler gear, and crescentshaped partition cast integral with the cover. Power applied to the rotor is transmitted to the idler gear with which it meshes. The space between the outside diameter of the idler and the inside diameter of the rotor is sealed by the crescent.
As the rotary gear pump starts, the teeth come out of mesh, increasing the volume. This creates a partial vacuum, drawing the liquid into the pump through the suction port. The liquid fills the spaces between the teeth of the idler and the rotor and is carried past the crescent partition through the pressure side of the pump. When the teeth mesh on the pressure side, the liquid is forced from the spaces and out through the discharge port.
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