Malleable Cast Iron Conical Seat Union Fitting with Black Core

Malleable Cast Iron Conical Seat Union Fitting with Black Core

The Female-Female conical seat union fitting in malleable cast iron with a black core is an essential element for the assembly and easy maintenance of your piping networks. This special fitting is designed to join two components or pipes while offering the possibility of disassembling them quickly and without having to rotate the tubes. Its three-piece design, including a loose nut, ensures a hermetic connection thanks to the metal tapered seat (without additional joints) that compresses during tightening. Its malleable cast iron construction gives it superior strength and reliability for long-lasting use in demanding environments.

The Key Utility of the Conical Reach Union Fitting

To put it simply, a union fitting is a magical piece of plumbing. Its role is to allow you to connect two pipes (or two parts) without having to rotate them both at the same time, which is impossible when they are already fixed. But most importantly, it's designed so you can disassemble the line easily. If you need access to a component for maintenance or repair (a pump, filter, valve), you simply loosen the loose nut from the union. This ease of disassembly is the main reason why this fitting is installed in critical sections of your fluid circuits.

Wide Applications and Aesthetic Robustness

This union fitting is a component of choice for the distribution of various fluids. It is ideally suited for water, gas, steam networks, as well as for non-corrosive liquids and gases. It is very present in HVAC (Heating, Ventilation and Air Conditioning) systems and industrial facilities where maintenance operations are frequent. Malleable cast iron with a black heart is also a mainstay of industrial furniture. The integration of this union fitting, with its black finish and technical three-piece look, brings a very authentic vintage and loft touch to furniture creations.

Design, Materials and Normative Compliance

The quality of this conical span union is certified by a rigorous manufacturing process. The fittings are produced in accordance with the international standards EN 10242 and ISO 49, which is a recognised guarantee of performance. The material selected is malleable cast iron EN-GJMB-350-10, in accordance with EN 1562. This cast iron is chosen for its high mechanical strength and its ability to withstand the stresses of the network over the long term, ensuring unfailing reliability.

Metal-to-Metal Sealing and Long-Lasting Protection

The sealing performance of this union fitting is ensured by a double mechanism.

• The joint creates a metal-to-metal seal thanks to its tapered span without the need for an additional seal, although an external seal must be applied to the threads of the components to be joined. The threads of the unions (free nuts) are of the gas type and meet the ISO 228-1 (BSPP) standard. The inlet threads on both female sides of the body comply with ISO 7-1 (BSPT), with a cylindrical female thread (Rp).

• To maximize its durability and oxidation resistance, the fitting has a black finish with a minimum thickness of at least 70μm (micrometers). This protective layer against corrosion preserves the integrity of the cast iron over time.

• Quality is guaranteed: each fitting is 100% tested for tightness ex factory, ensuring a leak-free connection.

Tips for an Efficient and Secure Installation

The installation of the union must be done precisely to ensure a perfect seal at the tapered span and external threads.

• Preparation of the fillets: Apply a quality sealant (Teflon or joint paste) to the tapered male threads (R) that will screw into the two female sides of the union fitting.

• Assembly: First screw the two main parts into the respective pipes. Then, bring the two ends of the union together and tighten the loose nut firmly. Tightening the nut compresses the tapered spans against each other, creating the internal seal.

• Alignment: Ensure perfect alignment of the two lines before the final tightening of the nut to avoid stress on the tapered seat.

• Maintenance: The great advantage of this fitting is that it allows disassembly by simply loosening the nut, without cutting or twisting the pipes.

Detailed technical specifications

The table below provides a summary of the key specifications of this union fitting: