Spool hydraulic directional control valve 631

electrically-operatedpilot-operatedelectro-hydraulic

Product overview
Moog 631 series servovalves are proven flow-control devices designed for machines requiring high performance, stability and precision. These mechanically feedbacked (MFB) servovalves use a robust 2-stage architecture covering rated flows from 3.8 to 78 l/min with nominal ranges typically 5–75 l/min and valve losses specified per control orifice.

Features

• 2-stage flow-control servovalve with mechanical feedback (MFB)
• Low-friction dual-nozzle pilot stage for high resolution and low hysteresis
• Compact body size suited to a variety of machine installations
• On-site configurable 5th port for separate pilot supply
• Field-replaceable primary disc filter for simplified maintenance
• Integrated fail-safe options to reduce component count

Specifications
Hydraulic data
Rated flow*: 3.8 to 78 l/min
Standard configurations: 5, 10, 20, 40, 60, 75 l/min
Max. operating pressure: 210, 310 or 350 bar

Performance data
100% step response**: 18 ms
Frequency response***: 75 Hz

Electrical data
Rated signal****: 30 to 150 mA
Standard configurations: 30, 100 mA

Physical data
Size (mounting pattern): Size 05 (ISO 4401-05-05-0-94)
Weight: 2.2 kg

Further options
Intrinsic safety, vented motor cap, manual override, reverse polarity

Notes
* @ ∆p 70 bar (1,000 psi); ** Response at 3,000 psi system pressure; *** at 90° phase lag; **** Single coil

Technical characteristics

• Series: 631
• Rated flow range: 3.8 to 78 l/min (standard configurations: 5–75 l/min)
• Max. operating pressure: 210 / 310 / 350 bar
• 100% step response: 18 ms
• Frequency response: 75 Hz
• Rated electrical signal: 30–150 mA (standard: 30, 100 mA)
• Mounting size: ISO 4401-05-05-0-94 (Size 05)
• Weight: approx. 2.2 kg
• Options: Intrinsically safe, vented motor cap, manual override, reverse polarity