SERVO-PROPORTIONAL CONTROL VALVES

The D660 Series proportional flow control valves are throttle valves for 2, 3, 4 and 5-way applications. These valves are suitable for electrohydraulic position, velocity, pressure or force control systems, including those with high dynamic response requirements.

Over time, Moog servo-proportional valves have undergone continuous improvements. Moog’s ServoJet® pilot stage reduces energy consumption and enhances the valves robustness. This pilot stage uses the jet pipe principle, which has been used reliably with different Moog valves for over 10 years.

We have updated D660 Series servo-proportional valves with new integrated 24 VDC electronics which improve valve dynamics significantly.

The improved D660 Series is designed to enhance the stability and performance of the valves in a wider variety of applications, increase the number of signal options and improve the fail-safe functionality of an application.

We have also redesigned the valve’s ServoJet® pilot stage, reducing hysteresis and null shift and improving pressure gain. Also, the updated ServoJet® pilot stage now has the ability to operate at a plus or minus 150 mA rated signal.

The new integrated electronics improve valve dynamics by up to 30 percent and now have a 24 VDC supply voltage, as well as 4 to 20 mA spool position output as options.

Changes in the D660 Series allow the 90° phase lag frequency response characteristic for small signals (10% amplitude) to increase from 78 Hz to 90 Hz in the D661 Series, (NG 10).

Other improvements in the D660 Series address many safety considerations in die-casting machines, injection-molding machines and presses. These include:

• The valve now places an enable signal at the operator’s disposal. If no enabled signal is available, the spool in the second stage moves to a predefined position (hydraulic zero or end position) depending on valve variant.
• The valve monitors supply voltage. If voltage on the updated valve (18 V up to 32 V) should drop below 18 V, the end position will be disconnected and the spool will move to its predefined position (fail-safe). It will be monitored as soon as it reaches this position and will be confirmed by a logic output.
• The logic outputs are short circuit protected. Maximum continuous voltage is 32 V with surge pulses up to 500 V and burst of 4 kV (per EMC standard).

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