Proportional Directional Valve 4WRZE25W8-325-7X/6EG24N9K31/A1D3M - Bosch Rexroth R900767522

A boom travels into a new position over minutes, and the motion must not judder. The 4WRZE25W8-325-7X/6EG24N9K31/A1D3M meters 325 l/min nominal flow under position control and takes pilot oil from a dedicated circuit that it drains to the outside.

Benefits

• Both pilot paths external, matching plants with a separate control oil unit.
• Nominal flow 325 l/min for large adjusting cylinders, plant maximum 870 l/min.
• Command value ±10 V with on-board electronics and internal position feedback.
• Spool symbol W8, 3 switching positions, ISO 4401-08-08-0-05, 4 ports, weight 20.66 kg.
• Operating pressure up to 350 bar, NBR seals, UKCA to SI2016/1091.

Applications

The valve adjusts booms, bucket wheels and conveyor bridges in opencast mining as well as luffing jibs on harbour cranes. Because the pilot stage comes from its own circuit, it stays unaffected by long pipe runs in the working circuit. The concealed manual override allows emergency motion on site.

Manufacturer

Bosch Rexroth, material number R900767522. Characteristic curves, dimensions and limits are in datasheet RE 29115, supplemented by RE 07600-B.