4WRZE25E325-7X/6EG24N9K31/A1D3M

The 4WRZE25E325-7X/6EG24N9K31/A1D3M valve is produced by Bosch Rexroth for the WRZ Proportional Directional Valves series. It meters hydraulic flow to cylinders or motors in closed loop automation where precise motion control is required. A command input of ±10 V provides a symmetrical analog reference so the onboard electronics can position the spool proportionally in both directions. The electronics operate on a 24 VDC supply voltage, which aligns with common machine control power buses and avoids a dedicated transformer. A nominal flow of 325 l/min at a 10 bar pressure drop enables the valve to drive large actuators without imposing excessive system losses. The main stage tolerates up to 350 bar operating pressure, allowing it to function in high-pressure circuits typical of modern presses and molding machines. During full travel a pilot oil flow of 7 l/min delivers sufficient pilot energy to shift the main spool smoothly. The pilot stage displaces 10 cm³ of oil from 0 to 100 % command, which defines the response speed and minimizes wasted pilot volume. Maximum current consumption is limited to 1.8 A so drive cards can be sized with standard industrial power outputs.

A power pulse current of 3 A is required for initial spool centering, so power supplies must accommodate this brief inrush. Port T may be externally drained at pressures up to 250 bar, which permits the valve to return fluid to circuits that operate above tank pressure. Port Y is rated for 30 bar, giving designers a low-pressure drain path for the pilot section without exceeding seal limits. Main flow passages demand fluid cleanliness of ISO 20/18/15 to protect the proportional spool and maintain repeatable flow characteristics. The pilot circuit requires cleaner oil at ISO 18/16/13, ensuring the smaller pilot orifices stay free of contamination. Storage temperatures can reach +80 °C, so preservation coatings and elastomers must withstand elevated heat during transport or warehouse periods. A minimum storage temperature of −20 °C confirms that seals remain intact in unheated facilities without risk of brittleness.