Pilot-Operated Proportional Valves for Analog Signals D680 Series

ISO 4401 SIZE 05, 07, 08 AND 10

The Moog D680 Series Proportional valve is now optionally available with a closed-loop controlled, D633 Direct Drive Valve as a pilot stage.The advantages of the new pilot stage option are a higher resistance against contamination, optimized dynamics and improved repeatibility. For more details, please refer to the updated product catalog.

Key features :

  • Optimized design of valve bodies for high rated flow
  • High energy efficiency due to D633 pilot valve with low internal leakage
  • Low range of minimum pilot pressure required
  • Integrated amplifier and control electronics for high functional flexibility
  • Excellent dynamic response due to high natural frequency of pilot stage
  • Different fail-safe options available allowing the best fit to application
  • Optionally available: new pilot valve with integrated electronics and position control of the pilot valve


Specifications D680 Series
Mounting pattern ISO 4401 sizes 05, 07, 08 and 10
Hydraulic Data
Maximum operating pressure – port P, A, B 350 bar (5,000 psi)
Rated flow at ∆pN 5 bar (75 psi) per spool land 30 to 1,500 I/min (7.9 to 396.3 gpm)
Maximum flow 3,600 I/min (751 gpm)
Step response time for 0 to 100 % stroke 9 to 40 ms
Electrical Data
Supply voltage 24 VDC (18 to 32 VDC)
Rated signal options +/-10 V, +/-10 mA and 4-20 mA