I. Product Appearance and Structural Features
PPR flanges are white disc-shaped with the following core designs:
Central Through Hole: Used for connecting PPR pipes, with an inner diameter matching the specifications of the corresponding pipe (e.g., a DN25 flange is suitable for a PPR pipe with an outer diameter of 25mm).
Edge Bolt Holes: Distributed symmetrically (usually 4, 6, or 8 holes; small diameters such as DN20-32 mostly have 4 holes, while large diameters like DN90-110 often have 8 holes). They connect to mating flanges/equipment via bolts and achieve leak prevention with sealing gaskets.
Surface Texture: Smooth with no burrs, reflecting the precision injection molding process of PPR material.
II. Core Attributes and Types
1. Material and Performance
Made of random copolymer polypropylene (PPR), it has the following characteristics:
Hygienic and Safe: Non-toxic and odorless, complying with drinking water standards (e.g., NSF certification), suitable for direct drinking water systems.
Corrosion and Temperature Resistance: Resistant to acids, alkalis, and salt corrosion. The long-term operating temperature is ≤70℃ (can withstand 100℃ for a short time), suitable for cold and hot water, and mild chemical media.
Lightweight: Weighs only 1/5 to 1/3 of metal flanges, reducing installation load.
2. Common Types
Integral Flanges: The flange disc and pipe connection part are integrally formed, with a compact structure. Suitable for small-diameter (e.g., DN20-32) and fixed connection scenarios (such as building water supply and drainage).
Loose Flanges (Split Type): Composed of a "flange disc + adapter" (the adapter is thermally fused to the pipe, and the flange disc can rotate). No strict alignment of bolt holes is required during installation, suitable for large-diameter (e.g., DN50-160) or frequently disassembled working conditions (such as equipment interfaces, outdoor pipelines).
III. Application Scenarios and Value
1. Applicable Fields
Civil Buildings: Cold and hot water pipe connections, floor heating systems (matching manifold), solar hot water pipelines.
Equipment Connection: Interface adaptation for end equipment such as water pumps and valves, enabling quick assembly and disassembly through flanges.
2. Comparative Advantages
Compared with metal flanges:
Avoids rust contamination (especially in drinking water and food fields);
Reduces installation difficulty (no welding required, thermal fusion connection is more convenient);
Saves long-term costs (strong corrosion resistance, service life of more than 50 years, reducing maintenance and replacement).
IV. Product Installation
1. Installation Key Points
Thermal Fusion Connection: Cut the pipe smoothly, set the thermal fusion temperature to 260±10℃, insert the pipe to the marked line (e.g., a DN25 pipe should be inserted about 20mm), and avoid shaking before cooling.
Bolt Tightening: Tighten symmetrically step by step (e.g., a DN50 flange uses a torque of 30-50N·m) to prevent leakage caused by local deformation.
With the core advantages of "corrosion resistance of plastic + convenience of flanges", PPR flanges are gradually replacing metal flanges in building and industrial pipeline systems, especially suitable for scenarios with high requirements for hygiene and lightweight. When selecting, it is necessary to focus on the three key factors of "pipe diameter, pressure, and installation method" to ensure the stable operation of the system.
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