Union 20mm DADEX PPRc

Description

Union 20mm

 

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What is Union 20mm DADEX PPRc ?

 

Description

A Union 20mm DADEX PPRc PN 25 is a detachable polypropylene random copolymer (PPRc) pipe fitting designed for quick assembly and disassembly in plumbing systems. The “Union” refers to a coupling that connects two pipes or fittings with a threaded nut and seal, allowing easy maintenance or reconfiguration without cutting the pipe. “20mm” indicates the nominal diameter (compatible with 20mm OD PPR pipes), “DADEX” is the brand name (likely from a manufacturer specializing in PPR systems, such as those produced in regions like the Middle East or Europe), “PPRc” denotes the durable, corrosion-resistant material, and “PN 25” specifies a pressure rating of 25 bar (362.5 psi). This fitting is ideal for HVAC (heating, ventilation, and air conditioning) systems and hot/cold water supply lines, where flexibility and leak-proof connections are essential. It’s part of the PPR piping family, known for its non-toxic properties, making it safe for potable water.

Specifications

• Material: Polypropylene Random Copolymer (PPRc) – offers excellent chemical resistance, thermal stability, and low thermal conductivity.
• Size: 20mm (nominal diameter; fits 20mm OD PPR pipes).
• Pressure Rating: PN 25 (25 bar at 20°C; reduces to ~10 bar at 95°C).
• Temperature Range: -20°C to 95°C (-4°F to 203°F) for continuous operation; short-term up to 110°C.
• Design: Typically includes a threaded union nut (often brass or PPR), O-ring seal (EPDM or similar), and two socket ends for fusion welding to PPR pipes.
• Dimensions: Approximate length 80-100mm, outer diameter matching 20mm pipe (varies by exact model); weight ~100-150g.
• Standards Compliance: Meets ISO 15874, EN 12201, or equivalent for PPR systems; often certified for potable water (e.g., WRAS or NSF/ANSI 61).
• Color: Usually green or white for plumbing identification.
• Additional Features: Smooth internal bore for minimal flow resistance; reusable with proper sealing.

Installation

Unions are straightforward to install, combining heat fusion for PPR connections and mechanical assembly for the union itself. Always follow manufacturer instructions and local plumbing codes.

1. Preparation: Clean and dry all components. Cut PPR pipes squarely and deburr edges.
2. Fusion Welding: Use a PPR welding tool to fuse the union’s socket ends to the pipes. Heat the socket and pipe to 260-280°C for 5-10 seconds, insert, and hold for 10-15 seconds to cool and form a bond.
3. Assembly: Insert the O-ring into the union body. Screw the union nut onto the threaded end by hand, then tighten with a wrench (torque to 10-15 Nm, depending on size – avoid overtightening).
4. Testing: Pressure-test the system (e.g., to 1.5x working pressure) for leaks. Incorporate expansion joints in hot water lines.
5. Tools Needed: Pipe cutter, PPR fusion machine, wrench, O-ring lubricant if required.
6. Safety Notes: Ensure ventilation during welding; wear protective gear. Unions allow for easy disassembly, so they’re great for future maintenance.

Usage

This union is used in HVAC and water supply systems for:

• Hot/Cold Water Supply: Connecting pipes to appliances, valves, or pumps in homes, offices, or industrial setups, where easy disconnection is needed for repairs.
• HVAC Applications: In heating loops, chilled water circuits, or radiator systems, providing flexibility in layouts and maintenance.
• Advantages: Enables tool-free disassembly, reduces installation time, and prevents pipe damage during servicing. Durable for 50+ years in typical conditions.
• Limitations: Not for high-vibration environments or systems exceeding PN 25 pressure/temperature. Protect from UV exposure outdoors.