Metal Tank Pressure Relief Valve Assembly

Product Specifications

Technical details and manufacturing context for Metal Tank Pressure Relief Valve Assembly

Definition

This pressure relief valve assembly is a safety component designed for installation on metal tanks, reservoirs, and pressure vessels. Its primary function is to prevent overpressure conditions by automatically releasing excess pressure when the internal pressure exceeds a predetermined set point. This action protects the integrity of the vessel and reduces the risk of catastrophic failure. The assembly is commonly used in industries such as chemical processing, petroleum storage, and industrial gas containment. It can be integrated during tank fabrication or added as a retrofit safety upgrade in B2B industrial supply chains.

The valve operates on a spring-loaded mechanism. When the internal pressure reaches the set pressure, the valve opens, allowing fluid or gas to discharge until the pressure normalizes, after which the valve reseals. Key parameters include a set pressure range of 1.0–1.6 bar, a relief capacity of 500–2000 m³/h, and an operating temperature range of -40 to 85 °C. Connection sizes range from DN25 to DN100, with pressure ratings from PN16 to PN40. The body material can be carbon steel (WCB) or stainless steel (CF8M), and seat materials include PTFE or PEEK. The assembly is available with stainless steel 316 or carbon steel ASTM A105 construction, and PTFE seals.

For procurement, it is essential to verify model-specific values and standards with the legal manufacturer or supplier. The listed standards (e.g., ISO 5208, ISO 4126-1) serve as reference points for testing and performance, but do not imply certification of any specific product. Always confirm that the valve meets the required set pressure, capacity, and material compatibility for your application.

Working Principle

The valve uses a spring-loaded disc that is held closed by spring force. When the internal pressure in the tank exceeds the set pressure, the force on the disc overcomes the spring force, causing the valve to open. This allows the pressurized fluid or gas to escape through the outlet, reducing the internal pressure. Once the pressure drops to a safe level (typically 80–95% of the set pressure, known as blowdown), the spring pushes the disc back to the closed position, resealing the valve. The response time from overpressure to full lift is less than 0.5 seconds, and the leakage rate at 90% of set pressure is minimal (≤0.1 mL/min).

Common Materials

Stainless Steel 316, Carbon Steel ASTM A105, PTFE Seals

Technical Parameters

Parameter	Typical range	Notes & selection driver
Set PressureRequired	1.0–1.6 bar	Pressure at which valve begins to openISO 5208
Relief CapacityRequired	500–2000 m³/h	Maximum flow rate at set pressureISO 4126-1
Operating TemperatureRequired	-40–85 °C	Maximum continuous operating temperature
Connection SizeRequired	DN25–DN100 DN	Nominal pipe diameter for installationISO 7005-1
Back Pressure	0–0.5 bar	Maximum allowable back pressure
Blowdown Pressure	0.8–0.95 %	Pressure drop percentage for resealingISO 4126-1
Body Material	WCB/CF8M	Carbon steel or stainless steelASTM A216/A351
Seat Material	PTFE/PEEK	Chemical compatibility
Leakage Rate	≤0.1 mL/min	At 90% of set pressureISO 5208
Response Time	≤0.5 s	From overpressure to full lift
Weight	5–20 kg	Depends on size and material
Pressure Rating	PN16–PN40 bar	Flange ratingISO 7268

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 Mechanism Part
Provides closing force and set pressure calibration

Material: Alloy Steel
Disc/Seat Assembly
Pressure sealing surface and flow control

Material: Stainless Steel with PTFE
Bonnet Part
Encloses spring mechanism and provides adjustment access

Material: Carbon Steel
Test Lever Optional Part
Manual testing and maintenance override

Material: Carbon Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Metal Tank Pressure Relief Valve Assembly.

Manufacturers of Metal Tank Pressure Relief Valve Assembly

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Sunthai Extractor

Zhejiang, CN

200-500 staff20,000 m²

ISO 9001:2015

Also makes: Pharmaceutical-Grade Sterile Sampling Valve, Viewing Port, Sanitary Centrifugal Pump and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Plumberstar

Shanghai, CN

Also makes: Butterfly Valve, Heating System, Pressure Gauge and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

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Technical documentation

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Manufacturing capability

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Frequently Asked Questions

What is the set pressure range for this valve?

The set pressure range is 1.0 to 1.6 bar, as listed in the product parameters. However, the exact set pressure for a specific application must be confirmed with the manufacturer or supplier, as it may be adjustable or customized.

What materials are available for the valve body and seals?

The body material can be carbon steel (WCB) or stainless steel (CF8M), and the seat material can be PTFE or PEEK. The valve also uses PTFE seals. Material selection should be based on the chemical compatibility and operating conditions of your system.

What is the maximum operating temperature?

The maximum continuous operating temperature range is -40 to 85 °C. Ensure that the valve is used within this range to maintain proper function and avoid damage.

How do I verify that this valve meets my requirements?

You must check the product datasheet and confirm the set pressure, relief capacity, connection size, and material compatibility with the legal manufacturer or supplier. The standards listed (e.g., ISO 5208, ISO 4126-1) are reference points for testing, but do not guarantee compliance for your specific model.

Data Basis

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

Preliminary Technical Classification

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pressure:	Up to 1500 psi (103 bar) set pressure
flow rate:	Cv 0.5 to 10.0 (depends on valve size)
temperature:	-20°C to 200°C
slurry concentration:	Not recommended for slurries >5% solids by volume