---
title: "Servo Valve"
industry: "Basic Metal Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SERVO_VALVE"
  data_integrity_hash: "38a9a8738e4956dd87ec55e99f44f4ed"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:SERVO_VALVE"
  data_source_uri: "https://cnfx.com/llms/industry/basic-metal-manufacturing/product/servo-valve.md"
  official_resource_url: "https://cnfx.com/industry/basic-metal-manufacturing/product/servo-valve"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-35 MPa (5-350 bar) hydraulic pressure, -40°C to 120°C fluid temperature, 4-20 mA or ±10 VDC electrical input"
    unit: "l/min"
engineering_limits:
  max_safe_operating_point:
    value: 0.05
    unit: "mm"
    consequence: "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"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Electrolysis-induced pitting corrosion in torque motor air gap at 0.5 μm/year erosion rate"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "316L stainless steel spool-sleeve assembly with 0.8 μm surface finish, nitrogen-charged hydraulic fluid with &lt;50 ppm water content"
  - node_2:
      trigger: "Abrasive wear from ISO 4406 18/16/13 contamination level particles in hydraulic fluid"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Betaₓ=200 absolute filtration at 3 μm nominal rating, hardened tool steel spool with 62 HRC surface hardness"
bom_nodes:
  torque-motor:
    type: "part"
    urn: "URN:CNFX:ME:TORQUE_MOTOR"
    interface_type: "physical-logic-coupled"
  spool:
    type: "component"
    urn: "URN:CNFX:ME:SPOOL"
    interface_type: "physical-logic-coupled"
  valve-body:
    type: "part"
    urn: "URN:CNFX:ME:VALVE_BODY"
    interface_type: "physical-logic-coupled"
  feedback-device-e-g-lvdt:
    type: "part"
    urn: "URN:CNFX:ME:FEEDBACK_DEVICE_E_G_LVDT"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
url: "https://cnfx.com/llms/industry/basic-metal-manufacturing/product/servo-valve.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "4fe5570bdf63b7458addc3209a981a9e154beb473e66bc8b2fa4112f0b4d005d"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Servo Valve

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

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-35 MPa (5-350 bar) hydraulic pressure, -40°C to 120°C fluid temperature, 4-20 mA or ±10 VDC electrical input**. Failure boundary: **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**, Mechanism: **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**.

### 2.1 Analytical Physics Model
Governed by the **Darcy-Weisbach Pressure Drop**:

> **Primary Equation**: $\Delta P = f \cdot \frac{L}{D} \cdot \frac{\rho v^2}{2}$  
> **Engineering Impact**: Critical for sizing CIP (Clean-In-Place) pump heads.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| f | Friction Factor | Engineering Constant |
| L | Pipe Length | Engineering Constant |
| v | Velocity | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Electrolysis-induced pitting corrosion in torque motor air gap at 0.5 μm/year erosion rate | 8 | Null shift exceeding 3% of rated flow, position feedback error of ±0.25% full scale | 316L stainless steel spool-sleeve assembly with 0.8 μm surface finish, nitrogen-charged hydraulic fluid with &lt;50 ppm water content |
| Abrasive wear from ISO 4406 18/16/13 contamination level particles in hydraulic fluid | 8 | Pressure gain reduction below 0.5 MPa/mA, step response time degradation beyond 10 ms | Betaₓ=200 absolute filtration at 3 μm nominal rating, hardened tool steel spool with 62 HRC surface hardness |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | l/min | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Torque Motor](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/torque-motor.md) `(Standalone System)`
- [Valve Body](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/valve-body.md) `(Standalone System)`
- [Feedback Device (e.g., LVDT)](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/feedback-device-e-g-lvdt.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Hydraulic Power Unit**, **Programmable Logic Controller**, **Position Feedback Sensor**  
**Downstream Applications**: Steel Rolling Mill Components, Aluminum Extrusion Dies, Metal Casting Molds  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What is the primary function of a servo valve in basic metal manufacturing?
**A**: 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.

### Q: Why are alloy steel and stainless steel used in servo valve construction?
**A**: 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.

### Q: How does the feedback device (e.g., LVDT) improve servo valve performance?
**A**: 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.

## 6. Manufacturing Compliance

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Servo Valve](https://cnfx.com/industry/basic-metal-manufacturing/product/servo-valve)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: SERVO_VALVE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: facbfc53
