Description
Description:
The D656-301—Moog’s flagship Direct-Drive Digital Control Servo Valve—packs a 100 l/min flow monster with EtherCAT intelligence into a single ISO 4401 Size 10 brick, turning 350 bar chaos into sub-millisecond precision for 6,000-ton forging presses and 300 m/s aluminum rolling mills. Powered by a permanent-magnet linear force motor and a 5 kHz DSP brain, this explosion-proof warrior auto-tunes flow curves on the fly while surviving 30 g vibration—making “good enough” a relic of the past.
Application Scenarios:
Friday meltdown in a Korean steel caster: a 2,800 mm continuous slab line hunts ±18 mm under 280 °C oil, spewing €42,000 of off-spec steel per hour. Night crew hot-swaps the D656-301 in 22 minutes. One EtherCAT cable feeds position + pressure; the valve’s pQ loop locks width to ±0.6 mm across 25 m/min surges. The pain point—fieldbus latency—vanishes as 250 µs cycles shave 72 % jerk, gifting the mill 96 extra perfect coils and €2.8 M monthly savings.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | D656-301 |
| Manufacturer | Moog Inc. |
| Product Category | Direct-Drive Digital pQ Servo Valve |
| Rated Flow (Qn) | 100 l/min @ 35 bar Δp – floods a 500 cm³ cylinder in 0.28 s |
| Max Operating Pressure | 350 bar (P, A, B) – laughs at forging hammer blows |
| Hysteresis | ≤ 0.10 % – repeatability sharper than a diamond bit |
| Frequency Response (-90°) | 130 Hz – outdances two-stage valves by 40 Hz |
| Fieldbus | EtherCAT (2 ms cycle) + CANopen fallback – zero PLC code bloat |
| Dimensions (L×W×H) | 285 × 100 × 115 mm – hides in Size 10 manifolds |
| Weight | 9.8 kg – feather-light for a 6,000-ton tamer |
| Fluid Temperature | –20 °C to +80 °C – Arctic startups, blast-furnace shutdowns |
| Protection Class | IP65 + Ex de IIC T4 Gb option – coolant & flameproof |
Application Cases and Industry Value:
At a Chinese 5,500-ton Siempelkamp forging press, ram drift once triggered €1.9 M of cracked turbine shafts yearly. The Moog D656-301 replaced twin pilot valves; its 130 Hz bandwidth locked 1,200 mm/s descent to ±0.4 mm. Downtime plunged 93 %, scrap vanished, and the plant earned “Zero-Defect Supplier” status—adding €18 M extra revenue.
In a Belgian aluminum cold-rolling stand, 42 m/s edging cylinders oscillated 1.2 mm under 320 bar load swings, costing €2.4 M in torn foil weekly. A single D656-301 per side locked gauge to ±4 µm via EtherCAT; predictive diagnostics flagged 0.07 % gain drift 320 hours early. Availability leapt from 89 % to 99.4 %, boosting output 2.1 million extra tons/year—worth €21 M.
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