Structured Manufacturing Data (2026)

Feedback Device (e.g., LVDT)

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Feedback Device (e.g., LVDT) used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Feedback Device (e.g., LVDT) is characterized by the integration of Movable Core and Primary Coil. In industrial production environments, manufacturers listed on CNFX commonly emphasize Electrical Steel (Core) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A sensor component in servo valves that provides real-time position feedback of the valve spool to the control system.

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Product Specifications

Technical details and manufacturing context for Feedback Device (e.g., LVDT)

Definition
A feedback device, such as a Linear Variable Differential Transformer (LVDT), is a critical component within a servo valve that continuously monitors and reports the precise position of the valve's spool or actuator. This feedback signal is essential for the closed-loop control system to compare the actual position with the commanded position, enabling high-precision control of fluid flow, pressure, or force in hydraulic or pneumatic systems.
Working Principle
Typically, an LVDT-based feedback device consists of a movable ferromagnetic core connected to the valve spool, which moves inside a stationary transformer assembly (primary coil flanked by two secondary coils). An AC excitation signal applied to the primary coil induces voltages in the secondary coils. The core's position changes the magnetic coupling, creating a differential voltage output from the secondary coils. This output's magnitude and phase are linearly proportional to the core's (and thus the spool's) displacement from its null position, providing an accurate electrical signal representing spool position.
Common Materials
Electrical Steel (Core), Copper (Windings), Epoxy/Phenolic (Bobbin/Insulation), Stainless Steel (Housing)
Technical Parameters
  • Stroke length or measurement range of the feedback device, defining the total linear displacement it can accurately measure. (mm) Standard Spec
Components / BOM
  • Movable Core Part
    Ferromagnetic element attached to the valve spool; its linear movement within the coil assembly modulates the magnetic field.
    Material: Nickel-Iron Alloy (e.g., Permalloy)
  • Primary Coil Part
    Receives an AC excitation signal, generating an alternating magnetic field.
    Material: Enameled Copper Wire
  • Secondary Coils Part
    Two coils wound in series opposition; their induced differential voltage provides the position output signal.
    Material: Enameled Copper Wire
  • Bobbin Part
    A non-magnetic form that holds and insulates the coil windings.
    Material: Phenolic or Epoxy Glass
  • Housing Part
    Protects the internal components from the environment (fluid, pressure, debris) and provides mounting.
    Material: Stainless Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Feedback Device (e.g., LVDT).

servo valve LVDT position sensor industrial feedback device for machinery real-time valve spool position sensor LVDT sensor for servo valve control machinery equipment manufacturing feedback component

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Servo Valve
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 5000 psi
other spec: Flow Rate: 0-100 GPM, Slurry Concentration: <5% solids by weight
temperature: -40°C to +125°C
Media Compatibility
✓ Hydraulic oil (ISO VG 32-68) ✓ Water-glycol fluids ✓ Phosphate ester fluids
Unsuitable: High-concentration abrasive slurries (>5% solids)
Sizing Data Required
  • Valve spool stroke length (mm)
  • Required position resolution (μm)
  • Control system input voltage (V DC)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Signal drift or loss
Cause: Contamination of the core or coil assembly by dust, moisture, or metallic particles, leading to electrical interference or short circuits
Mechanical binding or sticking
Cause: Wear or misalignment of the core rod due to excessive vibration, thermal expansion, or lack of lubrication in moving parts
Maintenance Indicators
  • Erratic or fluctuating output readings on monitoring systems
  • Audible grinding or scraping noises during operation
Engineering Tips
  • Implement regular cleaning and inspection schedules to prevent contamination, using appropriate seals or enclosures in harsh environments
  • Ensure proper alignment and mounting to minimize mechanical stress, and apply compatible lubricants to moving components as per manufacturer specifications

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 Quality Management Systems IEC 61000-6-2 Electromagnetic Compatibility (EMC) EN 61010-1 Safety Requirements for Electrical Equipment
Manufacturing Precision
  • Linearity: +/-0.25% of full range
  • Null Voltage: <0.5% of full range output
Quality Inspection
  • Environmental Testing (Temperature, Humidity, Vibration)
  • Electrical Performance Verification (Linearity, Repeatability, Hysteresis)

Factories Producing Feedback Device (e.g., LVDT)

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of this feedback device in servo valves?

This LVDT feedback device provides real-time position feedback of the valve spool to the control system, enabling precise servo valve operation in machinery and equipment manufacturing applications.

What materials ensure durability in industrial environments?

The device features an electrical steel core for magnetic efficiency, copper windings for conductivity, epoxy/phenolic insulation for protection, and stainless steel housing for corrosion resistance in demanding industrial settings.

How does this component integrate with servo valve control systems?

The movable core connects to the valve spool while primary and secondary coils on the bobbin generate position signals that interface directly with PLCs or controllers for closed-loop feedback in machinery automation systems.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Machinery and Equipment Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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