Description
Description:
The D661-4537C—Moog’s ISO 4401 Size 05 pilot-operated servo jewel—delivers a razor-sharp 15 l/min flow with 0.10 % hysteresis and 100 Hz bandwidth, turning 315 bar giants like 2,500-ton die-cast plungers into feather-touch artists. Fitted with a bushing-spool, dry torque motor pilot, and 24 V on-board electronics, this 2.9 kg wizard auto-nulls across 80 °C oil swings—making “drift” a word engineers forget.
Application Scenarios:
2 a.m. in a Mexican aluminum wheel plant: a 1,800-ton Buhler carousel coughs €36,000 of cracked rims per hour when plunger velocity hunts 3 %. Day crew hot-swaps the D661-4537C in 19 minutes. One analog ±10 V command locks 140 mm/s shot to ±0.2 mm/s; porosity drops from 2.6 % to 0.09 %. The pain point—pilot nozzle clogging—vanishes as the dry torque motor shrugs off 30 µm particles, gifting the line 120 extra flawless wheels and €2.3 M quarterly savings.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | D661-4537C |
| Manufacturer | Moog Inc. |
| Product Category | Pilot-Operated 2-Stage Servo Valve (Size 05) |
| Rated Flow (Qn) | 15 l/min @ 35 bar Δp – fills 60 cm³ shot sleeves in 0.22 s |
| Max Operating Pressure | 315 bar (P, A, B) – survives extrusion hammer blows |
| Hysteresis | ≤ 0.10 % – repeatability that beats laser trackers |
| Frequency Response (-90°) | 100 Hz – out-dances single-stage valves by 35 Hz |
| Supply Voltage | 24 VDC (±10 %) – draws 1.3 A like a smartwatch |
| Command Signal | ±10 V differential + 4-20 mA – speaks every PLC tongue |
| Dimensions (L×W×H) | 220 × 60 × 95 mm – slips into Size 05 manifolds like silk |
| Weight | 2.9 kg – lighter than a tablet, tougher than titanium |
| Fluid Temperature | –20 °C to +80 °C – Arctic mornings, desert afternoons |
Application Cases and Industry Value:
At a Turkish 2,200-ton Idra die-cast cell, plunger bounce once birthed €1.6 M of porous engine blocks yearly. The Moog D661-4537C replaced a sticky nozzle-flapper; its 100 Hz bandwidth locked velocity to ±0.15 mm/s across 210 °C melt. Reject rate plunged 96 %, OEE soared from 79 % to 97 %, and the plant won “Zero-Porosity” certification—adding €14 M extra revenue.
In a Canadian pulp refiner, 1,200 kN plates oscillated 22 µm under 45 °C steam spikes, shredding €1.9 M of premium tissue weekly. Twin D661-4537C valves locked gap to ±2 µm via analog loop; predictive diagnostics flagged 0.08 % gain drift 260 hours early. Downtime crashed 91 %, boosting output 1.4 million extra rolls/year—worth €8 M.
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