Product Detail

D660 Series

Quick Overview


Mounting Surface: ISO 4401 Size 05 to 10

Max Pressure: 3000 to 5000 PSI (207 to 345 bar)
Rated Flow Rate: 8 to 400 gpm (30 to 1500 l/min)

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.

Moog has updated the 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.

Moog has 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).

The D660 Series Proportional Control Valves are of two-stage or three-stage design. The spool motion of the main stage is produced by either a single-stage or a two-stage pilot valve. Two-stage proportional valves are mainly used when low threshold and good dynamic response with small signals are. The three-stage proportional valves are suitable for good dynamic response with large signals.

By combining a fast first stage, a suitable spool drive area and integrated electronics, an optimum proportional valve can be offered.

The D07 to D10 (NG 16 to NG 32) D660 Series valves offer the highest flow per body size. They are available with a stub shaft spool for higher valve dynamic.

Mechanical and electrically controlled fail-safe versions provide defined safe spool position by a spring and/or a poppet valve, and/or by external hydraulic supply cut off.

The high natural frequency of the ServoJet® pilot stage (500 Hz) allows for higher overall valve dynamic.

Improved frequency response of the ServoJet® pilot stage valve allows high spool position loop gain. The high loop gain provides excellent static and dynamic response, resulting in superior control system performance.

The high-pressure recovery of the ServoJet® pilot stage (more than 80% ÆP at 100% command signal) provides higher spool driving forces and ensures enhanced spool position repeatability.

The ServoJet® pilot stage valves have larger internal clearances making it more tolerant to contamination. The pilot stage filter has almost unlimited life due to an increased filter size (200 μm nominal fineness).

D661 D662 D663
Rated Flow (Δ 75 psi/5 bar per land) 8 gpm 30 l/min 40 gpm 150 l/min 92 gpm 350 l/min
16 gpm 60 l/min 66 gpm 250 l/min - -
21 gpm 80 l/min - - - -
Max Operating Pressure F 3000 psi 207 bar
H 4000 psi 276 bar
K 5000 psi 345 bar
Viscosity Range 39 to 1853 SSU at 100 °F 4  to 400 cSt
Temperature Range -4 to +176 °F -20 to +80 °C
D664 D665
Rated Flow (Δ 75 psi/5 bar per land) 145 gpm 550 l/min 265 gpm 1000 l/min
- - 400 gpm 1500 l/min
Max Operating Pressure F 3000 psi 207 bar
H 4000 psi 276 bar
K 5000 psi 345 bar
Viscosity Range 39 to 1853 SSU at 100 °F 4  to 400 cSt
Temperature Range -4 to +176 °F -20 to +80 °C

Product Specifications