Nabic DN40 1 1/2″ 542 Safety Relief Valve 6.5 Bar for Hot Water Boilers Steam Air Brass PTFE Seat
The Nabic DN40 1 1/2″ 542 Safety Relief Valve features a durable brass body, PTFE seating, and 6.5 Bar pressure rating, ideal for hot water, steam, and air systems.
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- Estimated Delivery: For most items (over 99% of our products), orders placed before 3pm on working days will be dispatched the same day with our Fast DELIVERY 1st class service. For the rare items not immediately in stock, dispatch may take 1-3 working days after receiving your order. If your order cannot be dispatched the same day, we will notify you via email.
- For boilers: We aim to dispatch on the next working day. However, in some cases, it may take 2-3 working days to dispatch. Rest assured, we will always strive for the fastest possible turnaround.
The Nabic 542 DN40 1 1/2″ Safety Relief Valve offers reliable protection for pressurized systems including hot water boilers, steam generators, and air applications. Built from high-quality brass with a resilient PTFE seat, this valve is designed for tight shut-off, thermal resistance, and long service life.
Rated to 6.5 Bar, the valve ensures overpressure is safely discharged, maintaining system integrity and compliance with BS EN ISO 4126-1 standards. Its design also features a drain plug (DN40 and above) to simplify inspection and maintenance routines, supporting dependable performance in safety-critical environments.
With easy cleaning access and multi-application capability, the Nabic 542 stands out as a trusted general-purpose relief valve across heating and compressed air systems.
Key Features
Resilient PTFE Seating – Ensures long-lasting tightness and resistance to wear
Durable Brass Construction – Provides corrosion resistance and robust system integration
Easy Maintenance – Includes drain plug on DN40 for simple inspection and cleaning
Versatile Application – Designed for hot water, steam, and air systems
Pressure Control – Calibrated to 6.5 Bar for consistent system safety
Standards Compliant – Certified to BS EN ISO 4126-1 for performance assurance
Applications
Boiler Pressure Relief – Protects hot water systems from excess pressure buildup
Steam System Safety – Maintains controlled release in steam and thermal systems
Air System Protection – Suitable for compressed air network pressure management
Technical Specifications:
| Feature | Details |
|---|---|
| Brand | Nabic |
| Product Name | 542 |
| Part Number | NAB54204065 |
| Max Pressure | 6.5 Bar |
| Connection Size | 1 1/2 inch |
| Connection Type | Threaded |
| Material | Brass |
| Suitable For | Hot Water, Steam, Air |
| Standards | BS EN ISO 4126-1 |
| Seating | PTFE |
| Markings | DN40 Fig.542 CC491K |
| Compliant Year | 2021 |
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