Proportional Directional Valve 4WRZE16E3-150-7X/6EG24N9K31/A1M - Bosch Rexroth R900972977

If the system runs a separate pilot pump or if system pressure swings widely, the pilot stage should not hang on the P channel. This version draws pilot oil externally through X and drains it externally through Y, which keeps pilot pressure independent of working pressure. It meters 150 l/min at size 16, with a valve limit of 460 l/min.

Benefits

• External pilot supply and external pilot return keep the pilot stage independent of working pressure.
• 150 l/min nominal flow, limit 460 l/min at 350 bar.
• Command value plus/minus 10 V through the 7-pole connector to EN 175201-804.
• On-board electronics, 24 VDC supply, no separate controller card.
• Spool symbol E3, 3 switching positions, 4 ports, NBR seals for HL oil.
• Concealed manual override, valve weight 12.56 kg.

Applications

The external version pays off wherever system pressure collapses under load, for example on presses with a rapid stroke followed by force build-up. Constant external pilot pressure keeps the stroke time of the main spool stable. It requires an adequately sized pilot supply at X and an unpressurised return line at Y.

Manufacturer

Bosch Rexroth lists this valve under material number R900972977. 2 manufacturer documents cover characteristic curves, port pattern and installation dimensions.