---
title: "Positive Displacement Pump"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:POSITIVE_DISPLACEMENT_PUMP"
  data_integrity_hash: "89f9b5b22db4a58b5be31646d83e4e54"
  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:POSITIVE_DISPLACEMENT_PUMP"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/positive-displacement-pump.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/positive-displacement-pump"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-15.0 bar differential pressure, 0.1-5.0 L/min flow rate"
    unit: "L/min"
engineering_limits:
  max_safe_operating_point:
    value: 2.0
    unit: "m"
    consequence: "Cavitation due to vapor pressure drop below 0.023 bar at 20°C, mechanical fatigue from cyclic stress exceeding 200 MPa yield strength, diaphragm creep at temperatures above 80°C"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Particulate contamination &gt; 25 μm in fertilizer solution"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Install 10 μm absolute filtration with differential pressure monitoring"
  - node_2:
      trigger: "Hydraulic hammer from solenoid valve closure in &lt; 50 ms"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Implement accumulator with 0.5 L capacity and pressure relief valve set at 18 bar"
bom_nodes:
  housingcasing:
    type: "component"
    urn: "URN:CNFX:ME:HOUSINGCASING"
    interface_type: "physical-logic-coupled"
  rotorsgearspistons:
    type: "component"
    urn: "URN:CNFX:ME:ROTORSGEARSPISTONS"
    interface_type: "physical-logic-coupled"
  sealsgaskets:
    type: "component"
    urn: "URN:CNFX:ME:SEALSGASKETS"
    interface_type: "physical-logic-coupled"
  inletoutlet-ports:
    type: "component"
    urn: "URN:CNFX:ME:INLETOUTLET_PORTS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 5199:2016 - TECHNICAL SPECIFICATIONS FOR CENTRIFUGAL PUMPS"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/positive-displacement-pump.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "981f95faf58171492c9ac42998d134f371f84577fd18e8263b33893a3d590ae9"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Positive Displacement Pump

## 1. Technical Definition
A pump that moves a fixed volume of fluid per cycle, providing precise flow control for liquid fertilizer injection.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-15.0 bar differential pressure, 0.1-5.0 L/min flow rate**. Failure boundary: **Cavitation occurs at NPSHa &lt; 2.0 m, mechanical seal fails at shaft deflection &gt; 0.05 mm, diaphragm rupture at pressure &gt; 25.0 bar**, Mechanism: **Cavitation due to vapor pressure drop below 0.023 bar at 20°C, mechanical fatigue from cyclic stress exceeding 200 MPa yield strength, diaphragm creep at temperatures above 80°C**.

### 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 fertilizer solution | 8 | Check valve seat erosion causing 15% flow reduction | Install 10 μm absolute filtration with differential pressure monitoring |
| Hydraulic hammer from solenoid valve closure in &lt; 50 ms | 8 | Diaphragm fatigue fracture at stress concentration points | Implement accumulator with 0.5 L capacity and pressure relief valve set at 18 bar |

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

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Liquid Fertilizer Storage Tank**, **Flow Meter and Control System**, **Pressure Relief Valve**  
**Downstream Applications**: Precision Fertilized Crops, Agricultural Irrigation Systems, Hydroponic Nutrient Solutions  

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

### Q: What are the main advantages of using a positive displacement pump for liquid fertilizer injection?
**A**: Positive displacement pumps provide precise, consistent flow rates regardless of pressure changes, ensuring accurate fertilizer application and preventing over- or under-dosing in agricultural systems.

### Q: How do the materials (stainless steel, cast iron, engineering plastics) affect pump performance and longevity?
**A**: Stainless steel offers corrosion resistance for harsh chemicals, cast iron provides structural durability, and engineering plastics reduce weight and friction, together ensuring reliable operation with various fertilizers and extended service life.

### Q: What maintenance is required for the rotors, gears, pistons, and seals in these pumps?
**A**: Regular inspection and lubrication of moving parts (rotors/gears/pistons) and periodic replacement of seals/gaskets are recommended to prevent leaks and maintain precise flow control, with frequency depending on usage and fluid compatibility.

## 6. Manufacturing Compliance
- ISO 5199:2016 - TECHNICAL SPECIFICATIONS FOR CENTRIFUGAL PUMPS

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Positive Displacement Pump](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/positive-displacement-pump)**

### 🌐 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**: POSITIVE_DISPLACEMENT_PUMP | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 4c0ac23c
