---
title: "Needle Valve"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:NEEDLE_VALVE"
  data_integrity_hash: "0cb7b62684ce0603fad02a6f109198fa"
  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:NEEDLE_VALVE"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/needle-valve.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/needle-valve"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.1-400 bar (10-40000 kPa) with flow coefficient Cv 0.01-2.5"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 450
    unit: "bar"
    consequence: "Cavitation-induced erosion at vapor pressure differential &gt;0.7 bar (70 kPa) across orifice, thermal fatigue from cyclic ΔT&gt;150°C causing 316L stainless steel embrittlement"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Particulate contamination &gt;25 μm in hydraulic fluid"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install 10 μm absolute filtration with differential pressure monitoring at 0.3 bar trigger"
  - node_2:
      trigger: "Over-torque installation exceeding 20 N·m on 1/4&quot; NPT fittings"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Torque-limiting calibration wrenches with 18 N·m maximum setting and strain gauge verification"
bom_nodes:
  needle:
    type: "component"
    urn: "URN:CNFX:ME:NEEDLE"
    interface_type: "physical-logic-coupled"
  valve-body:
    type: "part"
    urn: "URN:CNFX:ME:VALVE_BODY"
    interface_type: "physical-logic-coupled"
  seat:
    type: "component"
    urn: "URN:CNFX:ME:SEAT"
    interface_type: "physical-logic-coupled"
  stemhandle:
    type: "component"
    urn: "URN:CNFX:ME:STEMHANDLE"
    interface_type: "physical-logic-coupled"
  seals:
    type: "component"
    urn: "URN:CNFX:ME:SEALS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 17292:2015 (METAL BALL VALVES FOR PETROLEUM, PETROCHEMICAL AND ALLIED INDUSTRIES)"
    scope: "Verified Engineering Specification"
  - standard: "ANSI/ASME B16.34:2020 (VALVES - FLANGED, THREADED, AND WELDING END)"
    scope: "Verified Engineering Specification"
  - standard: "DIN 3356:2010 (GLOBE VALVES - GENERAL REQUIREMENTS)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/needle-valve.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "edcb311087a05dcdae44602536a74371ab573ed5bb5ee01415480fb4b019ac5c"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Needle Valve

## 1. Technical Definition
A precision flow control valve that uses a tapered needle to regulate fluid passage through an orifice.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.1-400 bar (10-40000 kPa) with flow coefficient Cv 0.01-2.5**. Failure boundary: **Seal failure at 450 bar (45 MPa) due to elastomer compression set exceeding 25%, stem galling at 0.5 mm radial deflection**, Mechanism: **Cavitation-induced erosion at vapor pressure differential &gt;0.7 bar (70 kPa) across orifice, thermal fatigue from cyclic ΔT&gt;150°C causing 316L stainless steel embrittlement**.

### 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 |
| :--- | :--- | :--- | :--- |
| Particulate contamination &gt;25 μm in hydraulic fluid | 8 | Needle tip scoring creating non-linear flow characteristic deviation &gt;15% from rated Cv | Install 10 μm absolute filtration with differential pressure monitoring at 0.3 bar trigger |
| Over-torque installation exceeding 20 N·m on 1/4&quot; NPT fittings | 8 | Body distortion causing seat leakage &gt;5 drops/minute at 100 bar test pressure | Torque-limiting calibration wrenches with 18 N·m maximum setting and strain gauge verification |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Valve Body](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/valve-body.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Pressure Regulator**, **Flow Meter**, **Fluid Filtration System**  
**Downstream Applications**: Hydraulic Systems, Chemical Processing Equipment, Instrumentation Panels  

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

### Q: What are the main applications of needle valves in machinery manufacturing?
**A**: Needle valves are used for precise flow regulation in hydraulic systems, lubrication lines, instrumentation, and process control applications where fine adjustment of fluid flow is required.

### Q: How does the tapered needle design improve flow control?
**A**: The tapered needle allows gradual restriction of the orifice opening, enabling precise metering of fluid flow with high resolution adjustment, making it ideal for applications requiring accurate flow rates.

### Q: What maintenance is required for needle valves in industrial equipment?
**A**: Regular inspection of seals and seating surfaces, periodic lubrication of the stem threads, and checking for leaks around the valve body. PTFE seals typically require less maintenance than other materials.

## 6. Manufacturing Compliance
- ISO 17292:2015 (METAL BALL VALVES FOR PETROLEUM, PETROCHEMICAL AND ALLIED INDUSTRIES)
- ANSI/ASME B16.34:2020 (VALVES - FLANGED, THREADED, AND WELDING END)
- DIN 3356:2010 (GLOBE VALVES - GENERAL REQUIREMENTS)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Needle Valve](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/needle-valve)**

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

> **Reference ID**: NEEDLE_VALVE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 2daf6e48
