Function description
- Main stage cone (2) with equal pilot-surfaces and metallic seat.
- Controlled by a high-dynamic servo-pilot valve (D661) or a high-dynamic proportional-pilot
valve (D633).
- Shut off of the connections A and B by cone-seat (8) of the main stage cone (2).
- => LEAKAGE FREE
- Pressure balance through the drilling (7) in the main stage cone (2), resulting in a very low
displacement force.
- Control of the main stage cone by a position transducer (5).
- Closed loop by integrated electronics (6).
- Failsafe features : Main stage cone always closed, when pilot pressure available,
=> biased pilot valve and also with a fail-safe sandwich plate on request.

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