Steam Generator Pressure Relief Valve Assembly

Product Specifications

Technical details and manufacturing context for Steam Generator Pressure Relief Valve Assembly

Definition

The Steam Generator Pressure Relief Valve Assembly is a critical safety component for industrial steam generators, designed to automatically release steam when system pressure exceeds predetermined safe limits. This assembly integrates multiple valve components into a single manufacturable unit, ensuring reliable pressure regulation in steam generation systems. It serves as an essential safety device in B2B industrial supply chains, protecting equipment and personnel from catastrophic failures. Manufacturers supply these assemblies to OEMs and maintenance providers for integration into steam generation equipment across various industries.

The assembly operates on a spring-loaded disc mechanism that opens when steam pressure exceeds the spring force, allowing steam to escape until pressure returns to safe levels. Key parameters include a set pressure range of 1.0–1.6 bar, blowdown pressure of 0.85–0.95 bar, and a flow coefficient of 0.75–0.85, all per ISO 4126-1. The maximum operating temperature is 220°C, with an operating temperature range of -10°C to 220°C (PTFE seat; EPDM limited to 120°C). Inlet connection sizes range from DN15 to DN50 per GB/T 9113. Body materials include WCB or CF8M per ASTM A216/A351, and seat materials are PTFE or EPDM. Leakage rate at 90% set pressure is ≤0.02 ml/min per ISO 5208, and response time for full lift is ≤0.5 seconds. Weight varies from 2.5 to 15 kg depending on size and material. Operating pressure range is 0.1–1.6 MPa.

Materials on file include Stainless Steel 316, Inconel 625, and High-Temperature Elastomers. These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. Standards listed are procurement references and do not imply certification or compliance of any specific product.

Working Principle

The assembly uses a spring-loaded disc mechanism. Under normal operation, the spring force holds the disc against the valve seat, sealing the system. When steam pressure exceeds the set pressure (1.0–1.6 bar), the force on the disc overcomes the spring force, causing the disc to lift and allow steam to escape through the outlet. This reduces system pressure. Once pressure drops to the blowdown pressure (0.85–0.95 bar), the spring force reseats the disc, closing the valve. The flow coefficient (0.75–0.85) indicates the valve's capacity to pass steam. The response time for full lift is ≤0.5 seconds, ensuring rapid pressure relief. The leakage rate at 90% set pressure is ≤0.02 ml/min, ensuring tight sealing during normal operation.

Common Materials

Stainless Steel 316, Inconel 625, High-Temperature Elastomers

Technical Parameters

Parameter	Typical range	Notes & selection driver
Set PressureRequired	1.0–1.6 bar	Pressure at which valve begins to openISO 4126-1
Blowdown PressureRequired	0.85–0.95 bar	Pressure at which valve reseats after openingISO 4126-1
Flow CoefficientRequired	0.75–0.85 dimensionless	Valve flow capacity coefficientISO 4126-1
Maximum Operating TemperatureRequired	220 °C	Highest continuous steam temperature
Inlet Connection SizeRequired	DN15–DN50 mm	Nominal pipe size for steam inletGB/T 9113
Body Material	WCB/CF8M	Carbon or stainless steelASTM A216/A351
Seat Material	PTFE/EPDM	PTFE for steam, EPDM for low temp
Leakage Rate	≤0.02 ml/min	At 90% set pressureISO 5208
Response Time	≤0.5 s	Full lift within 0.5s
Weight	2.5–15 kg	Depends on size and material
Operating Pressure Range	0.1–1.6 MPa	Below 0.1 MPa seat load insufficient
Operating Temperature Range	-10–220 °C	For PTFE seat; EPDM limited to 120°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Valve Body
Main pressure-containing structure

Material: Stainless Steel 316
Spring Assembly Part
Provides closing force against steam pressure

Material: Inconel 625
Disc and Seat Part
Forms pressure-tight seal when closed

Material: Stainless Steel 316
Bonnet Part
Encloses spring mechanism and provides adjustment

Material: Stainless Steel 316

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Steam Generator Pressure Relief Valve Assembly.

Manufacturers of Steam Generator Pressure Relief Valve Assembly

Manufacturer profiles associated with Steam Generator Pressure Relief Valve Assembly.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 16 September 2026

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Frequently Asked Questions

What is the set pressure range for this valve assembly?

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.

What materials are used in the construction?

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.

What is the maximum operating temperature?

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.

How does the valve prevent overpressure?

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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Set pressure range: 1-100 bar (14.5-1450 psi), Max operating pressure: 110% of set pressure
other spec:	Flow capacity: 10-1000 kg/h steam, Response time: <100 ms, Leakage rate: <0.01% of rated capacity
temperature:	Up to 400°C (752°F)