Proportional Directional Valve 4WRZE32E1-520-7X/6EG24K31/A1D3M - Bosch Rexroth R901128856

When a proportional directional valve is replaced, the spool symbol is where an apparently matching swap goes wrong. The 4WRZE32W8 and the 4WRZE32E1-520-7X/6EG24K31/A1D3M described here share size 32, interface ISO 4401-10-09-0-05 and a nominal flow of 520 l/min, yet their spool metering edges differ.

Key benefits

• Spool symbol E1 - a metering edge geometry of its own, which a valve with a different symbol cannot replace.
• 520 l/min nominal flow at 350 bar - the upper performance step of size 32, rated up to 1600 l/min by valve size.
• External pilot supply with external drain - the pilot circuit is fully separated from the main circuit.
• Command value ±10 V, supply 24 VDC - both routed through a 7-pole connector (6 + PE) to EN 175201-804.
• On-board electronics with a pressure reducing valve in the pilot circuit - pilot pressure stays independent of load pressure.
• 43.6 kg, NBR seals, hydraulic fluid HL - conformity UKCA SI2016/1091 for electromagnetic compatibility.

Applications

The valve sits in manifolds of large presses, forging plants and hydraulic test benches where the axis is guided from a PLC with a voltage command. When reordering, the symbol E1 should always be checked alongside the frame size. The valve is pilot-operated and built as a spool valve with 4 ports and 3 switching positions.

Manufacturer

Made by Bosch Rexroth, material number R901128856. The symbol overview, curves and performance limits are in data sheet RE 29115, with general valve data in RE 07600-B.