Industry-Verified Manufacturing Data (2026)

Servo Valve

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Servo Valve used in the Basic Metal Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Servo Valve is characterized by the integration of Torque Motor and Spool. In industrial production environments, manufacturers listed on CNFX commonly emphasize Alloy Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A precision electro-hydraulic control valve that regulates fluid flow in response to an electrical input signal.

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Product Specifications

Technical details and manufacturing context for Servo Valve

Definition
A critical component within the Heavy-Duty Rolling Mill Hydraulic Screwdown System responsible for precisely controlling the position, speed, and force of the hydraulic actuators. It translates low-power electrical signals from the mill's control system into high-power hydraulic fluid flow to achieve accurate and rapid adjustments of the roll gap during metal forming operations.
Working Principle
The valve uses a torque motor or solenoid to position a spool or flapper based on an input current. This movement opens or closes precise orifices, directing high-pressure hydraulic fluid to one side of an actuator cylinder and allowing return flow from the other, thereby controlling the actuator's motion proportionally to the input signal.
Common Materials
Alloy Steel, Stainless Steel
Technical Parameters
  • Nominal Flow Rate (l/min) Standard Spec
Components / BOM
  • Torque Motor
    Converts the electrical input signal into a mechanical torque to initiate spool movement.
    Material: Electrical Steel, Copper
  • Spool
    The sliding cylindrical part that precisely meters hydraulic fluid flow by opening and closing ports in the valve body.
    Material: Hardened Alloy Steel
  • Valve Body
    Houses the internal components and provides the fluid flow passages and mounting interface.
    Material: Steel or Ductile Iron
  • Feedback Device (e.g., LVDT)
    Measures the actual spool position and provides a feedback signal to the controller for closed-loop operation.
    Material: Various (Electrical Components, Steel)
Engineering Reasoning
0.5-35 MPa (5-350 bar) hydraulic pressure, -40°C to 120°C fluid temperature, 4-20 mA or ±10 VDC electrical input
Spool displacement exceeds 0.05 mm from null position under no-signal conditions, internal leakage exceeds 0.1 L/min at 21 MPa, torque motor saturation at 150 mA continuous current
Design Rationale: Spool stiction due to contamination-induced lapping wear at 5 μm particle size threshold, hydraulic lock from fluid viscosity change at 450 cSt, magnetic hysteresis loss exceeding 15% in torque motor laminations
Risk Mitigation (FMEA)
Trigger Electrolysis-induced pitting corrosion in torque motor air gap at 0.5 μm/year erosion rate
Mode: Null shift exceeding 3% of rated flow, position feedback error of ±0.25% full scale
Strategy: 316L stainless steel spool-sleeve assembly with 0.8 μm surface finish, nitrogen-charged hydraulic fluid with <50 ppm water content
Trigger Abrasive wear from ISO 4406 18/16/13 contamination level particles in hydraulic fluid
Mode: Pressure gain reduction below 0.5 MPa/mA, step response time degradation beyond 10 ms
Strategy: Betaₓ=200 absolute filtration at 3 μm nominal rating, hardened tool steel spool with 62 HRC surface hardness

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Servo Valve.

precision servo valve for metal manufacturing electro-hydraulic control valve alloy steel servo valve with LVDT feedback device industrial servo valve for hydraulic systems stainless steel servo valve spool torque motor

Applied To / Applications

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

Hydraulic Gap Control
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 350 bar (5000 psi)
flow rate: 0.5 to 200 L/min
temperature: -40°C to +120°C
slurry concentration: Not suitable for slurries; maximum particle size < 5 μm for clean fluids
Media Compatibility
✓ Hydraulic oil (ISO VG 32-68) ✓ Water-glycol fluids ✓ Phosphate ester fluids
Unsuitable: Corrosive or abrasive media (e.g., seawater, high-concentration acids)
Sizing Data Required
  • Required flow rate (L/min)
  • System pressure (bar)
  • Response time/bandwidth (Hz)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Spool sticking or binding
Cause: Contamination from particulates in hydraulic fluid, leading to abrasive wear and accumulation in tight clearances, or varnish formation from fluid degradation.
Coil failure or electrical malfunction
Cause: Overheating due to excessive current, moisture ingress causing short circuits or corrosion, or insulation breakdown from voltage spikes or thermal cycling.
Maintenance Indicators
  • Erratic or sluggish actuator movement, including hunting, oscillations, or failure to hold position, indicating spool or feedback issues.
  • Unusual audible noise such as buzzing, humming from the coil, or hissing from internal leakage, often accompanied by increased fluid temperature.
Engineering Tips
  • Implement strict fluid cleanliness protocols: use high-efficiency filters (e.g., ISO 4406 16/14/11 or better), monitor particle counts regularly, and ensure proper sealing of reservoirs to prevent ingress.
  • Maintain optimal operating conditions: control fluid temperature within manufacturer specs (typically 40-60°C), verify electrical supply stability (voltage/current), and perform periodic stroke tests to detect early wear or drift.

Compliance & Manufacturing Standards

Reference Standards
ISO 4401: Hydraulic fluid power - Four-port directional control valves - Mounting surfaces ANSI/B93.5: Hydraulic fluid power - Valves - Test methods DIN 24342: Hydraulic fluid power - Servo-valves - Mounting surfaces
Manufacturing Precision
  • Spool clearance: +/-0.005mm
  • Port flatness: 0.01mm per 25mm
Quality Inspection
  • Flow vs. current hysteresis test
  • Null shift pressure test

Factories Producing Servo Valve

Verified manufacturers with capability to produce this product in China

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✓ 96% Supplier Capability Match Found

S Sourcing Manager from Australia Feb 25, 2026
★★★★★
"Great transparency on the Servo Valve components. Essential for our Basic Metal Manufacturing supply chain."
Technical Specifications Verified
P Procurement Specialist from Singapore Feb 22, 2026
★★★★☆
"The Servo Valve we sourced perfectly fits our Basic Metal Manufacturing production line requirements. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
T Technical Director from Germany Feb 19, 2026
★★★★★
"Found 24+ suppliers for Servo Valve on CNFX, but this spec remains the most cost-effective."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

12 sourcing managers are analyzing this specification now. Last inquiry for Servo Valve from India (1h ago).

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Frequently Asked Questions

What is the primary function of a servo valve in basic metal manufacturing?

A servo valve precisely regulates hydraulic fluid flow in response to electrical input signals, enabling accurate control of machinery like presses, rollers, and CNC equipment in metal manufacturing processes.

Why are alloy steel and stainless steel used in servo valve construction?

Alloy steel provides high strength and durability for valve bodies, while stainless steel offers corrosion resistance for components like spools, ensuring reliable performance in demanding industrial environments with hydraulic fluids.

How does the feedback device (e.g., LVDT) improve servo valve performance?

The feedback device, such as an LVDT (Linear Variable Differential Transformer), provides real-time position feedback of the spool, allowing for closed-loop control that enhances accuracy, repeatability, and stability in fluid flow regulation.

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 Specifications verified by CNFX Industrial Index (v2.6.03) for Basic Metal Manufacturing sector.

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