Malleable Cast Iron Maleable Cast Iron Union Fitting with Black Core

Malleable Cast Iron Maleable Cast Iron Union Fitting with Black Core

The malleable cast iron black core conical seat union fitting is an essential piping component that facilitates the assembly and, most importantly, disassembly of fluid systems. Unlike conventional unions, this Male-Female model allows a male threaded component to be joined to a female threaded component while offering the unique ability to break the junction quickly, without turning the pipes. Its three-piece design, with a central loose nut, creates an ultra-reliable metal-to-metal seal. Made of malleable cast iron, this fitting ensures superior strength and durability, which is essential for critical systems.

Why Choose the Male-Female Conical Reach Union?

Imagine you need to install a valve or meter on an already attached pipe line. With standard fittings, you would have to cut or disassemble a large part of the line to be able to screw in the new element. The union fitting is a clever part that solves this problem. Its role is to provide you with a fast and safe point of disconnection. You screw one part onto the male tube and the other part onto the female tube, then you join the two with the loose nut. If you need maintenance or part replacement, you only have to unscrew this nut, separating the line effortlessly and without affecting the other components. It is the tool that saves time in the long run.

Technical Applications and Industrial Design

This union fitting is a pillar of the distribution of various fluids. Its robustness and tightness make it ideal for water, gas, steam and other non-corrosive liquid and gas networks. It is particularly popular in HVAC (Heating, Ventilation and Air Conditioning) systems, ensuring the connection of components that require regular maintenance access. Malleable cast iron with a black core is also a material of choice for industrial furniture. The integration of this union fitting, with its black finish and technical three-piece appearance, brings a very authentic and functional vintage and loft touch to furniture creations.

Design, Materials and Standards Compliance

The quality of this conical span union is the result of manufacturing under strict standards. The fittings are produced in accordance with the international standards EN 10242 and ISO 49, ensuring market-recognized performance and compatibility. The material selected is malleable cast iron EN-GJMB-350-10, as required by EN 1562. This cast iron is chosen for its high mechanical strength and its ability to withstand pressure and temperature variations without fail, ensuring unfailing reliability.

Sealless Sealing and Anti-Corrosion Protection

The reliability of this Male-Female union connection is ensured by a double level of quality: internal sealing and external protection.

• The union creates a metal-to-metal seal thanks to its internal tapered spans , an extremely reliable method that requires no additional flat gasket to seal the center junction. The union has one side with a tapered male thread (R) and one side with a cylindrical female thread (Rp), both of which comply with ISO 7-1 (BSPT). The free nut uses a gas type thread (BSPP), according to ISO 228-1.

• To maximize its durability, the fitting has a black finish applied with a minimum thickness of at least 70μm (micrometers). This protective layer against corrosion is essential to maintain the integrity of the cast iron over time.

• Quality is guaranteed: each fitting is 100% tested for tightness before it is put on the market.

Implementation and Secure Use

The installation of this fitting requires special attention to ensure a perfect seal of the tapered span and external threads.

• Preparation of the Junctions: Apply a quality sealant (Teflon or specific joint paste) to the tapered male threads (R) of the tube or fitting that will be connected to the female side (Rp) of the union body. The male side (R) of the union only needs sealing if the female receiver fitting is cylindrical.

• Assembly of the Parts: First screw the female side of the union onto the male fitting, and the male side of the union onto the female fitting. Then, bring the two ends of the union together and tighten the loose nut firmly to compress the tapered spans, creating the internal seal.

• Alignment: Make sure that the two lines are perfectly aligned before tightening the nut to avoid stress on the tapered seat.

Detailed technical specifications

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