General Description: This document outlines the features of a positive constant displacement, rotary, three-screw pump. It highlights a flow rate per revolution between 9.8 to 425 cm³ across 14 increments. The pump comprises a central driven screw (power rotor) and two sealing screws (idler rotors), all hydrodynamically journalled within the pump housing. Axial pressure and friction loads are hydraulically balanced, with the power rotor axially positioned by a ball-bearing that operates under minimal axial load.

Models and Specifications: The E4 pump series includes models designed for mounting to an air/fluid-cooled flanged electric motor, differentiated by inlet configurations and mounting designs. Variants include radial inlet for horizontal/vertical mounting (E4 xxBE), built-on inlet strainer for tank-top mounting (E4 xxTE), and extended inlet pipe for deep tank operation (E4 xxJE).

Model Code: The model code details series, size, rotor lead, generation, material, shaft seal type, and mounting design. It includes specifications for materials (aluminium or pearlitic cast iron) and shaft seal types (nitrile or viton).

Design Limits and Performance: The pump's maximum discharge pressure is 10 MPa, with pressure limits adjusted for fluid viscosity, rotor lead, and pump speed. Recommended speed limits vary by size, with maximum speeds from 4000 to 5000 rpm. It accommodates fluid viscosities of 12-400 mm²/s and temperatures from 0°C to +90°C, depending on material.

Filtration and Accessories: A strainer is recommended at the pump inlet to protect against foreign matter, with specified mesh widths based on flow rates. Standard accessories include an angle foot for pump unit assembly, flexible shaft coupling, and inlet/outlet counter flange sets.

Dimensions and Installation: The document provides detailed dimensions for pump series E4 xxBE, xxJE, and xxTE, including main dimensions, outlet/inlet port specifications, and motor connecting frame sizes. A selection guide for pump series E4 is also included, detailing flow rate and power consumption at various speeds and pressures.