Andritz Separation
The new SP series (photo) is a so-called “air-over-oil” filter press driven exclusively by compressed air. Air-over-oil filter presses are used where power connection is not available or possible in a process line. By deliberately dispensing with electrical equipment, the SP series is a cost-effective alternative to conventional machines and a further development of filter presses that are designed for manual operation only. The heart of the new press is the hydraulic unit operated by compressed air. Once supplied with air (6–8 bars), the pneumatically driven high-pressure pump generates up to 400 bars of hydraulic pressure. The inflowing hydraulic oil then moves the cylinder that generates the locking force required to close the press securely. After completion of the filtration process, the operator relieves the pressure. Units are available with filter areas of 6.5 to 226.4 m2 and volumes of 69.4 to 2,401 L. — Andritz Separation GmbH, Graz, Austria