Mechanical Position Feedback Two Stage Valve

The three-way pilot valve is housed co-axially inside the main- spool, thereby providing positional feedback bet ween the two stages. The main spool is controlled by pilot control pressure acting on an annular control chamber at one end of the spool counteracted by supply pressure acting on a bias piston of half the control chamber area at the opposite end of the spool. The pilot valve is operated by a torque or linear force motor.

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