OLSW 
The Stauff OLSW Offline Water-Absorbing Filters are auxiliary filtration units designed for the efficient removal of water and particulate contamination from industrial hydraulic systems. Equipped with an integrated motor-pump assembly, they use filter elements that combine solid particle removal (down to 0.5 micron) with high water absorption capacity. Available in single, double, or quadruple configurations, they prevent oil degradation and extend component service life.
The OLSW offline filters by :contentReference[oaicite:0]{index=0} represent an advanced solution for hydraulic fluid maintenance. These units are specifically designed to tackle contamination at its source by removing both solid particles and large amounts of water from oil.
The unit draws oil from the reservoir via an integrated gear pump and directs it through the filter element. Stauff technology uses special spin-on elements that act as pre-filters, removing most of the water and larger contaminants. In a second stage, the fluid passes through the Stauff Micro Filter, where final removal of water and solid particles down to 0.5 micron takes place. This prevents the catalytic reaction between water and solid particles, ensuring extended oil service life.
OLSW systems are highly modular. Contrary to previous indications, the series is divided according to the number of housings and the length of the filter elements:
The standard electric motor is three-phase (230/400 V AC, 50 Hz, 1360 rpm).
OLSW units provide stable performance for both new and existing installations:
The unit is compatible with a wide range of SRM-type replacement filter elements, including:
| Feature | Value |
|---|---|
| Unit Type | Offline Water-Absorbing Filter |
| Housing Configurations | Single (1), Double (2), Quadruple (4) |
| Nominal Flow Rate | From 2.1 l/min to 16.8 l/min |
| Max Housing Pressure | 20 bar |
| Max Differential Pressure | 6.2 bar |
| Viscosity Range | 20 … 160 cSt |
| Water Removal Technology | Absorbent spin-on elements (pre-filter) + micro filtration |
| Fine Filtration Rating | Down to 0.5 micron |
| Electric Motor (Standard) | 230/400 V AC, 50 Hz, 1360 rpm |
| Pump Type | Gear pump |
| Seals | NBR (standard), FKM (optional) |