Gas Shutoff Butterfly Valve, Nickel-plated Ductile Iron Disc; NBR - DN 50; L=43mm BRA.J9.101 GAS

Product detailed description

This gas butterfly valve is commonly used in industrial and commercial gas distribution systems. It provides a reliable shutoff function in applications where controlled flow interruption is required. Installers typically encounter these valves in boiler systems, process gas lines, and utility gas supply networks. The compact design and robust construction make it suitable for both indoor and outdoor environments where temperatures range between -10°C and +70°C.

The valve is designed for integration into systems adhering to PED 2014/68/EU standards for gas category G1. It is not suitable for steam applications and should be avoided in environments where high thermal expansion or condensation could affect the sealing material. The nickel-plated disc ensures corrosion resistance, while the NBR sealing material offers flexibility and durability under moderate pressures.

Technical parameters

Installation and connection

For proper installation, ensure that the valve is mounted in a straight section of the pipeline to avoid stress on the flanges. The valve must be aligned with the flow direction as indicated by the manufacturer's markings. Flange connections follow STN EN 1092-1 standards, and the flange class must match the system pressure rating (PN 16/PN 10/PN 6).

Common mistakes include misalignment of the flanges, which can lead to leakage, and incorrect tightening of bolts, causing uneven load distribution. Always use a torque wrench to tighten bolts in a cross pattern to ensure even compression of the sealing material. Before commissioning, inspect the seating surface for debris and verify the valve's operation by manually rotating the disc to confirm smooth movement.

Compatibility and accessories

This valve is compatible with standard flanged systems using EN 1092-1 flanges. To complete the installation, additional components such as flange gaskets, bolts, and nuts may be required. Ensure that all connecting parts are rated for the same pressure class and temperature range. No related products are listed for this model.

Technical background for designers

The butterfly valve operates by rotating a disc within the flow path. When the disc is perpendicular to the flow, it blocks the passage, and when parallel, it allows full flow. The nickel-plated ductile iron disc provides strength and resistance to corrosion, while the NBR sealing material ensures a tight seal under normal operating conditions. The cast iron body offers good mechanical strength and dimensional stability, making it suitable for long-term use in gas systems.

The valve integrates into gas systems by fitting between two flanged pipe sections. Its performance depends on correct alignment, proper sealing, and avoiding exposure to aggressive media or excessive temperatures. The material properties also influence the valve's service life—especially in environments with fluctuating temperatures or humidity.

Service and operation

During regular operation, the valve requires minimal maintenance. However, periodic inspections should be carried out to check for signs of wear on the sealing material and disc. Any visible damage or leakage should prompt immediate replacement of the affected components. No specific service intervals are provided in the brief.

To maintain optimal performance, ensure that the valve is operated within its specified temperature and pressure ranges. Avoid using excessive force when opening or closing the valve to prevent damage to the disc or seating surface. In case of suspected internal blockage or reduced sealing effectiveness, disassemble the valve carefully and clean the internal components with approved solvents.

Frequently asked questions

Can this valve be used with compressed air?
Yes, the valve is suitable for compressed air applications as long as the pressure remains within the PN 16/PN 10 rating and the temperature stays within -10°C to +70°C.

Is this valve compatible with flanges of different pressure ratings?
It is recommended to use flanges with matching pressure ratings (PN 16, PN 10, or PN 6) to ensure proper sealing and structural integrity.

Can this valve be used in steam systems?
No, the valve is not suitable for steam due to the limitations of the NBR sealing material, which degrades under high-temperature steam conditions.

How does the nickel-plated disc affect the valve’s durability?
The nickel plating enhances the disc’s resistance to corrosion and wear, improving the valve’s longevity in gas applications.