MOOG D691-072D

Description

Technical Specifications:

• Product Model: D691-072D

• Manufacturer: Moog Inc.

• Product Category: Proportional Servo Valve

• Nominal Flow (Qn): 190 L/min

• Maximum Pressure: 350 bar

• Control Type: Bistable (±10 mA)

• Frequency Response (-90°): 70 Hz

• Fluid Temperature: -20°C to +100°C

• Filtration Class: ISO 4406 17/15/12

• Flange Type: ISO 10372-10-05-0-05

• Control Interface: MIL-DTL-5015 connector

• Spool Position Accuracy: ±0.5%

• Ambient Temperature: -40°C to +135°C

• Vibration Resistance: 20g

• Shock Resistance: 100g

• Diagnostic Functions: Coil temperature monitoring, filter clogging detection, spool performance monitoring

• Status Indicator: LED with viewing window

Functional Features:

• Excellent dynamics with 70 Hz frequency response at 100% amplitude

• Position feedback technology ensures ±0.5% spool accuracy

• Extreme pressure capability up to 350 bar

• Reinforced housing withstands 20g vibration and 100g shock loads

• Integrated diagnostic functions including coil temperature monitoring, filter clogging detection, and spool performance parameters

• LED status indicator visible through viewing window

• CANopen compatible

• ISO 10372 flange mounting compatible with most industrial hydraulic systems

• Configurable port connections (P-T-A-B or P-A-B-T)

Performance Parameters:

• Nominal Flow: 190 L/min

• Maximum Pressure: 350 bar

• Frequency Response (-90°): 70 Hz

• Spool Position Accuracy: ±0.5%

• Vibration Resistance: 20g

• Shock Resistance: 100g

D691-072D-5 Variant Specifications:

• Rated Flow: 72 L/min (at 70 bar pressure drop)

• Supply Pressure Range: 70-350 bar (500 bar peak, short-term)

• Control Signal: ±10V DC or PWM (with optional digital driver)

• Leakage: <5 L/min (at 350 bar supply pressure)

• Weight: Approximately 8.5 kg

• Step Response Time (10%-90% flow rise): <4 ms

• Frequency Response (-3dB bandwidth at 50% rated flow): >300 Hz

• Damping Ratio: 0.6-0.8 (adjustable via internal pressure feedback)

• Vibration Rating: MIL-STD-810G (15g rms random vibration, 20-2000Hz)

• Shock Tolerance: 150g, 11ms half-sine wave

• Protection Rating: IP67

Material Composition:
Reinforced housing construction capable of withstanding extreme environmental conditions. Corrosion-resistant internal components with high-grade sealing materials.

Structural Features:
The D691-072D features a two-stage structure with a nozzle-flapper pilot stage amplifying the input signal and a spool main stage controlling large flow. The valve incorporates triple-stage filtration (pilot stage filter + main stage filter + spool protection screen) for enhanced contamination resistance.

Working Principle:
A low-power electrical control signal (±10 mA or ±10V) is applied to the torque motor. The pilot stage amplifies the input signal, and the main spool controls the hydraulic flow. Position feedback technology ensures accurate spool positioning. Integrated diagnostic functions continuously monitor critical parameters including coil temperature and filter condition. CANopen communication enables integration with digital control networks.

Advantages and Strengths:

• Superior dynamics with 70 Hz frequency response

• Extreme pressure capability to 350 bar

• Excellent environmental tolerance (-40°C to +135°C ambient)

• High vibration and shock resistance (20g/100g)

• Intelligent diagnostics with LED status indication

• CANopen compatible for digital integration

• Ultra-low hysteresis (<0.1% typical, D691-072D-5 variant)

• Superior linearity (<±0.2%, D691-072D-5 variant)

Applicable Industries:

• Aerospace (aircraft flight control actuation systems, rocket thrust vector control)

• Metallurgy (continuous casting mold oscillation control, rolling mill AGC)

• Plastics machinery (injection molding hydraulic closed-loop control)

• Power generation (steam turbine valve control, hydro turbine guide vane regulation)

• Testing and simulation (structural fatigue test rigs, wind tunnel model attitude control)

• Aerospace test equipment (hydraulic cylinders generating up to 500 tons of load)

Model Series:
MOOG D691 Series

Installation Requirements:

• ISO 10372-10-05-0-05 flange mounting

• MIL-DTL-5015 control interface connector

• Filtration class ISO 4406 17/15/12 minimum

• Triple-stage filtration recommended for D691-072D-5 variant

• CANopen network integration capability

Usage Precautions:

• Fluid cleanliness must meet ISO 4406 17/15/12 standard

• Fluid temperature range: -20°C to +100°C

• Ambient temperature range: -40°C to +135°C

• External filtration required for contamination control

• Proper CANopen configuration required for digital operation