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D680 DIRECT DRIVE PILOTED PROPORTIONAL SERVOVALVES - FOR WOOD PROCESSING
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D680 DIRECT DRIVE PILOTED PROPORTIONAL SERVOVALVES - FOR WOOD PROCESSING - 1

D680 DIRECT DRIVE PILOTED PROPORTIONAL SERVOVALVES The D680 Direct Drive Pilot Stage Proportional Flow Control Valves with integrated on board electronics are applications. They are suitable for electrohydraulic position, velocity, pressure and force control systems, including those with high dynamic response requirements. The D680 series valve incorporates into it's 2-stage design, a Direct Drive valve The valve model numbers listed on the back were specifically designed to withstand the harsh environment, vibration, and shock loads found in wood/lumber processing plants. Benefits of the Direct Drive Pilot Valve ■ Requires no pilot leakage flow resulting in considerable energy ■ Dynamics of the direct drive valve is nearly independent of the operating ■ Reliable operation; the excellent pressure gain of the pilot valve with spool/bushing provides high spool driving forces to the long stroke main spool; this ensures enhanced main spool position control even with high flow forces and contaminated fluids ■ Excellent dynamics based on a high natural frequency allows high main spool position loop gain, resulting in extremely good static and dynamic response of the main valve WHAT MOVES YOUR WORLD

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D680 DIRECT DRIVE PILOTED PROPORTIONAL SERVOVALVES - FOR WOOD PROCESSING - 2

A direct drive pilot valve requires no pilot leakage flow which results in considerable energy savings, especially for systems with multiple valves. The dynamics of the direct drive valve is nearly independent of the operating Rated pressure drop ApN/ bar Valve pressure drop Ap / bar Operation of the Mini Direct Drive Valves The position control loop for the main stage spool, position transducer and pilot valve is closed by the integrated electronics. An electric command signal (flow rate set point) is applied to the integrated position controller which drives the current in the pilot valve...

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