Ⅰ. Product Overview
The PPR full-plastic equal-diameter 90° elbow is a pure plastic pipe fitting dedicated to right-angle turning in PPR pipeline systems. Its core function is to achieve precise 90° direction switching of pipelines while maintaining consistent pipe diameter throughout. Adopting 100% random copolymer polypropylene material for integral molding without any metal inserts, it forms a homogeneous sealing structure with PPR pipes through hot-melt connection technology, ensuring the safe and stable transportation of cold and hot water as well as fluids. With its full-plastic environmental protection characteristics, excellent corrosion resistance and adaptability, the product is widely used in drinking water systems, building water supply and drainage, civil heating and ventilation and other scenarios sensitive to metal pollution.
Ⅱ. Structural Design and Composition
1. Main Structural Features
Full-plastic integral molding: Adopting an overall injection molding process without metal components, the inner wall features a 90° large arc curved streamline design (curvature radius R≥1.5 times the pipe diameter), reducing water flow turning resistance. The height of the inner flange is ≤0.3mm to avoid flow reduction due to diameter shrinkage.
Reinforced wall thickness design: The wall thickness in the stress concentration area of the turning part is increased by 15%-20% compared with standard pipe fittings, improving impact resistance and adapting to the full range of DN20-DN110 equal-diameter pipelines.
2. Auxiliary Functional Structures
Seal optimization design: The inner wall is smooth without burrs, forming a homogeneous fusion seal with the pipe after hot melting without additional seals; the outer wall is provided with anti-slip ribs for easy gripping and positioning during installation.
Installation adaptability: It needs to be matched with special PPR pipe clamps and fixed brackets to ensure the stability of the pipeline at the right-angle turning part and reduce interface fatigue caused by vibration.
Ⅲ. Material Composition and Performance Characteristics
1. Main Substrate Properties
PPR pure material substrate: Selected random copolymer polypropylene raw materials conforming to GB/T18742 standard, free of recycled materials and additives, with a temperature resistance range covering -20℃ to 95℃, and no harmful substances precipitated during long-term use.
Sanitary safety certification: Passed NSF, GB/T17219 and other drinking water safety certifications, and can be directly used in sanitary pipeline systems such as domestic drinking water and food processing.
Function upgrade options: Models with inner layer added with nano-silver ion antibacterial masterbatch can be optionally equipped, with an antibacterial rate of ≥99% against Escherichia coli and Staphylococcus aureus; dark-colored models (black/gray) have a light-shielding rate of >99% to inhibit algae growth.
Ⅳ. Core Technical Advantages
1. Full-Plastic Environmental Protection Characteristics
The design without metal components avoids the risk of electrochemical corrosion and metal ion precipitation, especially suitable for water quality-sensitive areas; the material can be 100% recycled and reused, conforming to EU RoHS environmental protection directives and green building standards.
2. Reliability of Homogeneous Hot-Melting
After heating with a special hot-melt machine (260℃±10℃) for 5-20 seconds, it achieves molecular-level fusion with PPR pipes. After cooling, the interface strength is higher than that of the pipe itself, without the risk of leakage due to thermal expansion and contraction caused by material differences.
3. Corrosion Resistance and Long-Term Durability
The full PPR material has excellent acid and alkali corrosion resistance and can withstand erosion by common chemical media; after 1000 hours of artificial accelerated aging test, the tensile strength retention rate is >90%, and the service life can reach more than 50 years.
4. Optimization of Fluid Resistance
The streamlined design of the 90° large arc curved inner wall reduces the local resistance coefficient to 0.25, reducing water flow energy consumption by 60% compared with traditional right-angle elbows and reducing the impact of water hammer on the pipeline.
Ⅴ. Typical Application Scenarios
Residential water supply and drainage: Right-angle connection of cold and hot water pipes at the corner of bathrooms and kitchen sink water supply pipelines, adapting to commonly used pipe diameters of DN20-DN32.
Heating and ventilation systems: Turning of exposed pipelines of radiators and connection of inlet and outlet pipes of fan coils, avoiding rust pollution of heat-conducting media by metal pipe fittings.
Drinking water projects: Right-angle turning of community secondary water supply and direct drinking water pipeline systems to ensure no metal pollution in water quality.
Exposed pipeline projects: White models can be directly exposed without additional anti-corrosion treatment, featuring both aesthetics and practicality.
Ⅵ. Selection and Installation Suggestions
Specification matching: Select models according to the designed pressure (≤PN16), pipe diameter and medium temperature of the pipeline, and prefer low-resistance models with large arc curved design.
Key points of hot-melt operation: Strictly control the hot-melt depth (14mm for DN20, 16mm for DN25), with a heating time error of ≤±1 second to avoid inner wall shrinkage caused by over-melting.
Pressure test specifications: After installation, conduct a water pressure test with 1.5 times the working pressure, and the pressure drop shall be ≤0.05MPa within 30 minutes of pressure maintaining to be qualified.
Environmental adaptation notes: When constructing in an environment below -5℃, the pipe fittings need to be preheated to 10℃-20℃ to prevent low-temperature brittle fracture.
With the core advantages of full-plastic environmental protection, homogeneous sealing, corrosion resistance and long-term durability, the PPR full-plastic equal-diameter 90° elbow has become an ideal choice for realizing right-angle turning in modern clean pipeline systems, and its technical characteristics effectively improve the safety and economy of fluid transportation.
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