--- type: "product_component" title: "Steam Generator Pressure Relief Valve Assembly" industry: "Manufacture of Steam Generators, Except Central Heating Hot Water Boilers" verification_protocol: urn: "URN:CNFX:ME:STEAM_GENERATOR_PRESSURE_RELIEF_VALVE_ASSEMBLY" data_integrity_hash: "df4ce758ed8316651f167b4444ff0aa8" 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:STEAM_GENERATOR_PRESSURE_RELIEF_VALVE_ASSEMBLY" data_source_uri: "https://cnfx.com/llms/industry/manufacture-steam-generators/product/steam-generator-pressure-relief-valve-assembly.md" official_resource_url: "https://cnfx.com/industry/manufacture-steam-generators/product/steam-generator-pressure-relief-valve-assembly" is_verified_logic: true attributes: set_pressure: status: "verified" value: "1.0–1.6" unit: "bar" blowdown_pressure: status: "verified" value: "0.85–0.95" unit: "bar" flow_coefficient: status: "verified" value: "0.75–0.85" unit: "dimensionless" maximum_operating_temperature: status: "verified" value: "220" unit: "°C" inlet_connection_size: status: "verified" value: "DN15–DN50" unit: "mm" body_material: status: "verified" value: "WCB/CF8M" unit: "" seat_material: status: "verified" value: "PTFE/EPDM" unit: "" leakage_rate: status: "verified" value: "≤0.02" unit: "ml/min" response_time: status: "verified" value: "≤0.5" unit: "s" weight: status: "verified" value: "2.5–15" unit: "kg" operating_pressure_range: status: "verified" value: "0.1–1.6" unit: "MPa" operating_temperature_range: status: "verified" value: "-10–220" unit: "°C" engineering_limits: max_safe_operating_point: value: 27.5 unit: "bar" consequence: "Yield strength exceedance of ASTM A216 WCB carbon steel at 204°C (400°F) operating temperature, where σ_yield = 250 MPa" fmea_matrix_quantitative: - node_1: trigger: "Corrosion-induced pitting from chloride stress corrosion cracking in 316L stainless steel components" severity: 8 occurrence: 3 detection: 4 mitigation_protocol: "Cathodic protection system with -0.85V vs. SCE reference electrode potential" - node_2: trigger: "Thermal fatigue from 150-204°C (302-400°F) cyclic temperature differentials" severity: 8 occurrence: 3 detection: 4 mitigation_protocol: "Inconel 718 spring material with ΔT_max = 55°C (100°F) thermal shock resistance" bom_nodes: valve-body: type: "part" llms_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/valve-body.md" link_type: "product" link_target_urn: "URN:CNFX:ME:VALVE_BODY" urn: "URN:CNFX:ME:VALVE_BODY" interface_type: "physical-logic-coupled" is_standalone: true spring-assembly: type: "component" llms_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/component/spring-assembly.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:SPRING_ASSEMBLY" urn: "URN:CNFX:ME:UNIT:SPRING_ASSEMBLY" interface_type: "physical-logic-coupled" is_migrated_part: true disc-and-seat: type: "component" llms_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/component/disc-and-seat.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:DISC_AND_SEAT" urn: "URN:CNFX:ME:UNIT:DISC_AND_SEAT" interface_type: "physical-logic-coupled" is_migrated_part: true bonnet: type: "component" llms_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/component/bonnet.md" link_type: "part" link_target_urn: "URN:CNFX:ME:UNIT:BONNET" urn: "URN:CNFX:ME:UNIT:BONNET" interface_type: "physical-logic-coupled" is_migrated_part: true manufacturing_compliance: url: "https://cnfx.com/llms/industry/manufacture-steam-generators/product/steam-generator-pressure-relief-valve-assembly.md" on_chain_sovereignty: contract_standard: "ERC-721-Industrial" metadata_hash: "0dd002c25497a90a75090acfd7a2e804018cb4779699448d120e3e7d18fe0247" royalty_logic: "IPFS-CID-REQUIRED" mint_status: "logic-verified-ready" rag_vector_index: semantic_queries: - "Steam Generator Pressure Relief Valve Assembly" - "steam generator pressure relief valve" - "safety valve assembly" - "overpressure protection" - "ISO 4126-1" - "industrial steam generator" - "Steam Generator Pressure Relief Valve Assembly in Manufacture Steam Generators" - "China Steam Generator Pressure Relief Valve Assembly manufacturer" - "Steam Generator Pressure Relief Valve Assembly supplier China" - "Steam Generator Pressure Relief Valve Assembly set_pressure" - "Steam Generator Pressure Relief Valve Assembly blowdown_pressure" - "Steam Generator Pressure Relief Valve Assembly flow_coefficient" version: "3.3.5-EXTREME-SOVEREIGN-WEB3" --- # Industrial Specification: Steam Generator Pressure Relief Valve Assembly ## 1. Technical Definition Safety valve assembly for industrial steam generators that prevents overpressure conditions. ## 2. Engineering Reasoning & Causal Matrix > **Operational Intelligence**: Designed for **0.1-25.0 bar**. Failure boundary: **27.5 bar (110% of maximum allowable working pressure)**, Mechanism: **Yield strength exceedance of ASTM A216 WCB carbon steel at 204°C (400°F) operating temperature, where σ_yield = 250 MPa**. ### 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 | | :--- | :--- | :--- | :--- | | Corrosion-induced pitting from chloride stress corrosion cracking in 316L stainless steel components | 8 | Valve seat leakage at 0.5 bar below set pressure | Cathodic protection system with -0.85V vs. SCE reference electrode potential | | Thermal fatigue from 150-204°C (302-400°F) cyclic temperature differentials | 8 | Spring relaxation causing 10% reduction in set pressure over 1000 cycles | Inconel 718 spring material with ΔT_max = 55°C (100°F) thermal shock resistance | ## 3. Key Technical Parameters | Parameter | Value | Unit | Status | | :--- | :--- | :--- | :--- | | Set Pressure | 1.0–1.6 | bar | Verified | | Blowdown Pressure | 0.85–0.95 | bar | Verified | | Flow Coefficient | 0.75–0.85 | dimensionless | Verified | | Maximum Operating Temperature | 220 | °C | Verified | | Inlet Connection Size | DN15–DN50 | mm | Verified | | Body Material | WCB/CF8M | | Verified | | Seat Material | PTFE/EPDM | | Verified | | Leakage Rate | ≤0.02 | ml/min | Verified | | Response Time | ≤0.5 | s | Verified | | Weight | 2.5–15 | kg | Verified | | Operating Pressure Range | 0.1–1.6 | MPa | Verified | | Operating Temperature Range | -10–220 | °C | 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**: **Steam Pressure Test Bench**, **Valve Calibration System**, **Leak Detection Equipment** **Downstream Applications**: Industrial Steam Generators, Power Plant Boiler Systems, Process Heating Equipment ## 5. Engineering Risks & FAQ - **Caution**: - **Caution**: - **Caution**: ### Q: What is the set pressure range for this valve assembly? **A**: The set pressure range is 1.0–1.6 bar, per ISO 4126-1. This is the pressure at which the valve begins to open. Always verify the exact set pressure for your specific model with the manufacturer. ### Q: What materials are used in the construction? **A**: Materials on file include Stainless Steel 316, Inconel 625, and High-Temperature Elastomers. Body material options are WCB or CF8M per ASTM A216/A351, and seat materials are PTFE or EPDM. Confirm material suitability for your application. ### Q: What is the maximum operating temperature? **A**: The maximum continuous steam temperature is 220°C. The operating temperature range is -10°C to 220°C for PTFE seats, while EPDM is limited to 120°C. Verify temperature limits with the supplier. ### Q: How does the valve prevent overpressure? **A**: The valve uses a spring-loaded disc that opens when steam pressure exceeds the spring force, releasing steam to reduce pressure. It reseats when pressure drops to the blowdown pressure (0.85–0.95 bar). This automatic operation protects the system from overpressure conditions. ## 6. Manufacturing Compliance --- ### 🛠️ Engineering Resource Access 🔗 **[Full Specification: Steam Generator Pressure Relief Valve Assembly](https://cnfx.com/industry/manufacture-steam-generators/product/steam-generator-pressure-relief-valve-assembly)** ### 🌐 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**: STEAM_GENERATOR_PRESSURE_RELIEF_VALVE_ASSEMBLY | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 58d399b0