---
title: "Relief Valve (Optional)"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:RELIEF_VALVE_OPTIONAL"
  data_integrity_hash: "75926615572861a1f8d4c1af289aed67"
  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:RELIEF_VALVE_OPTIONAL"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/relief-valve-optional.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/relief-valve-optional"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-25.0 bar"
    unit: "bar or psi"
engineering_limits:
  max_safe_operating_point:
    value: 28.5
    unit: "bar"
    consequence: "Plastic deformation of the spring-disk assembly due to sustained pressure exceeding the material's yield strength (typically 250-350 MPa for spring steel), leading to permanent set and loss of calibration"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Corrosive fluid ingress (pH &lt;4.0 or &gt;10.5) interacting with the 316L stainless steel sealing surface"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Application of PTFE coating (0.1-0.3 mm thickness) on all wetted surfaces or selection of Hastelloy C-276 material"
  - node_2:
      trigger: "Cyclic pressure fluctuations exceeding ±15% of set pressure at frequencies above 5 Hz"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Installation of pulsation dampener upstream with 0.5-1.0 L accumulator volume and pressure snubber"
bom_nodes:
  valve-body:
    type: "part"
    urn: "URN:CNFX:ME:VALVE_BODY"
    interface_type: "physical-logic-coupled"
  spring:
    type: "component"
    urn: "URN:CNFX:ME:SPRING"
    interface_type: "physical-logic-coupled"
  poppetdisc:
    type: "component"
    urn: "URN:CNFX:ME:POPPETDISC"
    interface_type: "physical-logic-coupled"
  seal-o-ringgasket:
    type: "component"
    urn: "URN:CNFX:ME:SEAL_O_RINGGASKET"
    interface_type: "physical-logic-coupled"
  adjustment-screwcap:
    type: "component"
    urn: "URN:CNFX:ME:ADJUSTMENT_SCREWCAP"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/relief-valve-optional.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "a83a307b60886e115fb8261d165dd3435161ea06ada80a95f96d00b94b14ec91"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Relief Valve (Optional)

## 1. Technical Definition
A safety device installed on a distribution manifold/block to prevent overpressure by automatically releasing excess fluid when pressure exceeds a preset limit.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-25.0 bar**. Failure boundary: **28.5 bar (115% of maximum rated pressure)**, Mechanism: **Plastic deformation of the spring-disk assembly due to sustained pressure exceeding the material's yield strength (typically 250-350 MPa for spring steel), leading to permanent set and loss of calibration**.

### 2.1 Analytical Physics Model
Governed by the **Thin-Wall Pressure Vessel Stress Analysis**:

> **Primary Equation**: $\sigma_h = \frac{P \cdot D}{2t}$  
> **Engineering Impact**: Determines the hoop stress boundary to prevent rupture.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| P | Internal Pressure | Engineering Constant |
| D | Diameter | Engineering Constant |
| t | Wall Thickness | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Corrosive fluid ingress (pH &lt;4.0 or &gt;10.5) interacting with the 316L stainless steel sealing surface | 8 | Pitting corrosion at the valve seat causing continuous leakage below set pressure | Application of PTFE coating (0.1-0.3 mm thickness) on all wetted surfaces or selection of Hastelloy C-276 material |
| Cyclic pressure fluctuations exceeding ±15% of set pressure at frequencies above 5 Hz | 8 | High-cycle fatigue fracture of the spring (typically at 10^6-10^7 cycles) leading to catastrophic failure to open | Installation of pulsation dampener upstream with 0.5-1.0 L accumulator volume and pressure snubber |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | bar or psi | 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 Gauge**, **Hydraulic Power Unit**, **Fluid Filtration System**  
**Downstream Applications**: Hydraulic Presses, Industrial Pumps, Compressed Air Systems  

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

### Q: What materials are used in this relief valve construction?
**A**: This relief valve features a stainless steel body and spring for corrosion resistance, brass adjustment components, and elastomer seals (O-rings/gaskets) for reliable fluid containment and pressure management.

### Q: How does this relief valve prevent overpressure in machinery systems?
**A**: The valve automatically opens when system pressure exceeds the preset limit, releasing excess fluid through the poppet/disc mechanism. This protects equipment from damage by maintaining safe operating pressures in distribution manifolds and blocks.

### Q: What maintenance does this industrial relief valve require?
**A**: Regular inspection of seals for wear, checking spring tension, and verifying pressure settings via the adjustment screw/cap. Periodic cleaning of the valve body and poppet ensures consistent performance in machinery applications.

## 6. Manufacturing Compliance

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

### 🌐 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**: RELIEF_VALVE_OPTIONAL | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 8b1c97eb
