Function description
- Main stage spool (2) with equal pilot-surfaces.
- Controlled by a high-dynamic proportional-pilot valve (D633).
- Pressure balance through the drilling (7) in the main stage spool (2), resulting in a very low
displacement force.
- Control of the main flow from P to A or A to T by the spool lands (8).
- Control of the main stage spool by a position transducer (5).
- Closed loop by integrated electronics (6).
- Failsafe features : => Fail-safe sandwich plate or biased pilot valve.

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