Description
D136-001-008: Product Overview
The MOOG D136-001-008 is a two-stage electrohydraulic servo valve from the D136 Series, engineered for precision control of hydraulic actuators in dynamic systems requiring moderate flow rates and rapid response. In an automation architecture, it serves as the critical interface between electronic controllers (e.g., PLCs, motion controllers) and hydraulic actuators (e.g., cylinders, small motors), converting low-power electrical command signals into proportional hydraulic flow and pressure. The D136 Series balances compactness with performance, making it suitable for laboratory test rigs, small-scale industrial machinery, and simulation systems where space constraints coexist with accuracy demands. This valve operates on a nozzle-flapper pilot stage (for signal amplification) and a sliding spool main stage (for flow modulation), ensuring stable output across varying loads. The “001-008” configuration denotes a single-channel design optimized for specific actuator coupling requirements (e.g., compact mounting or custom porting), distinguishing it from other D136 variants. It is typically deployed in closed-loop setups with position/force feedback, where adjustments to the input signal maintain desired actuator behavior—essential for avoiding overshoot in high-accuracy positioning tasks.
MOOG D136-001-008
D136-001-008: Technical Specifications
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Model Number: D136-001-008
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Manufacturer: Moog Inc.
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Product Type: Electrohydraulic Servo Valve (Two-Stage)
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Valve Configuration: 4-way spool (symmetrical flow paths, spring-centered), single-channel (001-008 configuration with compact porting)
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Nominal Flow: 10 GPM (37.9 L/min) @ 1000 psi (69 bar) differential pressure
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Maximum Pressure: 3000 psi (207 bar) per port
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Input Signal: ±10VDC (standard), ±40mA (via optional G122 series amplifier)
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Response Time: <18 ms (step input to 90% flow)
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Resolution: <0.15% of full scale (hysteresis <0.6%)
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Operating Temperature: -20°C to +80°C (-4°F to 176°F) (fluid-dependent)
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Fluid Compatibility: Petroleum-based oils (ISO VG 32/46), HFC fluids (e.g., Houghto-Safe 620)
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Weight: 2.0 kg (4.4 lbs, valve body only)
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Dimensions: 140mm (L) x 76mm (W) x 102mm (H) (approximate, with compact porting)
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Certifications: CE, ISO 9001 (manufacturing standard)
Core Features & Customer Value
Moderate-Flow Precision Control: The two-stage design (nozzle-flapper pilot + sliding spool) delivers linear flow output proportional to the ±10VDC input, with resolution <0.15% of full scale. For engineers calibrating material testing machines, this ensures force application accuracy within ±0.5% of setpoints—critical for valid tensile/compression data. The 001-008 configuration’s compact porting simplifies integration with space-constrained actuators, such as those in benchtop rigs.
Balanced Dynamic Response: A <18 ms response time allows rapid adjustment during transient conditions (e.g., cyclic loading in fatigue tests). In small hydraulic presses, this minimizes actuator lag, improving cycle time consistency by 10% compared to slower alternatives. For simulation systems, it ensures realistic replication of dynamic loads (e.g., vehicle suspension testing).
Compact, Rugged Construction: The valve body combines aluminum alloy (lightweight) with hardened spool lands (wear resistance), reducing weight by 25% versus cast-iron competitors. The 001-008’s compact porting further minimizes envelope size, fitting into crowded control cabinets or mobile machinery. For maintenance teams, this simplifies handling during installation/repair.
Simplified Maintenance: The two-stage design minimizes failure points (no complex pilot manifolds), and the spool/sleeve assembly is field-replaceable with basic tools. Annual maintenance time is reduced by 40% compared to multi-stage valves. The 001-008’s standardized connectors align with common hydraulic hose assemblies, cutting replacement time.
Seamless Integration: Native compatibility with Moog G122 amplifiers (for ±40mA signals) and standard analog controllers (PLCs, PID loops) enables plug-and-play setup. For procurement managers, this avoids costly custom interface development, especially in retrofits of legacy test rigs.
MOOG D136-001-008
Typical Applications
The D136-001-008 is deployed in systems prioritizing moderate flow, precision, and compact integration:
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Material Testing: Universal testing machines (tension/compression control), fatigue test rigs (cyclic load application up to 10 Hz).
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Laboratory Equipment: Benchtop hydraulic trainers, fluid power demonstration systems with space-limited actuators.
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Small Industrial Machinery: Robotic part feeders (positioning accuracy ±0.1mm), small press brakes (bend angle control).
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Simulation Systems: Flight control surface simulators (small-scale actuators), vehicle suspension test rigs.
In a university materials lab, for example, the D136-001-008 controls a hydraulic cylinder in a fatigue test rig for aluminum alloys. Its <18 ms response ensures the cylinder follows a 3Hz sinusoidal load profile within ±0.05mm displacement error—enabling accurate measurement of crack propagation rates. The 001-008’s compact porting allows direct mounting to the cylinder without additional adapters.
