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ABB LC100SSP7
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Parker LA471160U540

Product Brief:​
The Parker LA-prefix part number LA471160U540 corresponds to a high-performance hydraulic valve — typically a nozzle-flapper type two-stage electro-hydraulic servo valve or 4-way proportional directional control valve — used in precision motion control of heavy industrial machinery, test stands, and turbine governor systems.
Category:
Description
Technical Characteristics (Typical for Parker Servo Valve family):
  • Type:​ Two-stage, flapper-nozzle, force-motor or torque-motor driven servo valve
  • Flow Rating (Nominal):​ 37.9 L/min (10 gpm) to 75.7 L/min (20 gpm) @ 7 MPa (1000 psi) drop — verify exact orifice code in full Parker catalog
  • Rated Pressure:​ 210 bar (3000 psi) standard; some variants 315 bar (4500 psi)
  • Hysteresis:​ < 3 %
  • Step Response (0–100 %):​ 10–30 ms typical
  • Coil Resistance:​ ~40–80 Ω per coil (dual coil, ± polarity)
  • Port Pattern:​ ISO 4401-05-04-0-05 (NG10 / DIN 24340) or NG06 depending on frame
  • Fluid Requirement:​ Mineral hydraulic oil per ISO 11158; filtration to ISO 18/16/13 (NAS 7 or better)
  • Body Material:​ Anodized aluminum or ductile iron; spool/ sleeve: hardened tool steel, lapped
  • Seals:​ Viton (FKM) standard; NBR optional
Principle of Operation:
  • Input current to torque motor deflects flapper → creates pressure differential across first-stage nozzles → shifts second-stage spool proportionally
  • Spool position is mechanically or electrically fed back to null the first stage
  • Provides precise control of flow direction and magnitude to hydraulic actuator (cylinder or motor)
Installation & Notes:
  • Mount on rigid manifold; use 25 µm or finer return-line filtration
  • Avoid case drain backpressure > 2–3 bar; ensure proper drain routing
  • Zero may be adjustable via set screw; perform null adjustment with zero signal and warm oil
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