I. Structure and Core Design
Composition of Composite Structure
PPR Main Body: It is injection - molded from random copolymer polypropylene (PPR). It has the properties of temperature resistance (long - term ≤70℃, instantaneous ≤95℃), chemical corrosion resistance, and good hot - melt weldability, forming the flow channel for pipe bends.
Brass Female Thread Insert: It is fused with the PPR main body through an injection molding process. The inner surface is processed with standard threads (such as G1/2", G3/4") for connecting external threaded metal components. High - quality products use low - lead brass (such as Hpb58 - 2) and comply with the GB/T 17219 hygiene standard.
Fixed Base: It is integrally formed with the PPR main body, usually in a structure with mounting holes. It is used to be fixed on supporting surfaces such as walls and brackets through screws and expansion bolts to offset the interface stress caused by pipe vibration or external forces.
Core Role of the Base
Anti - displacement Reinforcement: Through the fixing of the base, it prevents the pipe from displacement due to water flow impact, equipment vibration, or its own weight, and avoids loosening and leakage at the interface between the PPR and the brass insert.
Installation Convenience: The base is preset with mounting holes, which can be directly rigidly connected to the wall or bracket, reducing the use of additional brackets. It is especially suitable for scenarios requiring concealed installation such as bathrooms and kitchens.
II. Performance Characteristics and Application Scenarios
Core Performance Parameters
Pressure Resistance Level: The nominal pressure (PN) is ≥2.5MPa, and the burst pressure is ≥7.5MPa, which is suitable for the conventional water pressure requirements (0.1 - 0.6MPa) of household and small - scale engineering.
Thermal Stability: The difference in thermal expansion coefficients between PPR and brass is compensated by the trapezoidal groove and barb structure of the insert, so there is no risk of cracking under long - term temperature difference cycles.
Sealing Reliability: The brass female thread has high precision. With raw material tape or sealant, zero leakage can be achieved. The surface of the insert is nickel - plated (thickness ≥0.02mm) to improve oxidation resistance and wear resistance.
Typical Application Scenarios
Bathroom Fixed Installation: For example, at the water inlet bend of wall - mounted shower faucets and washbasin faucets, it is fixed on the wall through the base to avoid pipe shaking when the faucet is in use.
Equipment Interface Connection: At the water inlet and outlet bends of water heaters and wall - mounted boilers, stable support is required to prevent pipe stress from being transmitted to the equipment interface.
Exposed Pipe Engineering: At the bends of exposed pipes in corridors, pipe wells, etc., the fixing of the base can improve the overall aesthetics and structural stability.
III. Installation Specifications and Operation Points
Base Fixing Process
Positioning and Drilling: Mark the installation position of the base according to the pipe direction, use an impact drill to drill holes in the wall, and insert expansion pipes.
Fastening the Base: Fix the base on the wall with self - tapping screws to ensure that the base is flat and not loose, and avoid uneven pipe stress caused by skewness.
PPR Hot - Melt Connection
Tools and Parameters: Use a special hot - melt machine, and set the heating temperature to 260±10℃. The heating time for DN20 pipe fittings is about 5 seconds, and for DN25 it is about 7 seconds. Overheating that causes PPR degradation is prohibited.
Operation Details: The ports of pipes and pipe fittings need to be cut flat, inserted vertically into the die head to the marked depth. After hot melting, quickly dock and keep axial fixation for 10 - 15 seconds. Rotation or force application is prohibited during the cooling period.
Internal Thread Sealing Treatment
Before connecting the metal external thread, it is necessary to wind the raw material tape clockwise on the brass internal thread and manually tighten it until it is sealed. Excessive force that causes the insert to fall off is prohibited.
IV. Differences from Ordinary Female Thread Elbows
|
Characteristics |
PPR Internal Thread Elbow with Base |
Ordinary PPR Female Thread Elbow |
|
Installation Stability |
With its own base for fixing, strong anti - displacement ability |
Requires additional brackets for fixing, vulnerable to external forces |
|
Application Scenarios |
Wall - mounted equipment, vibration environments, exposed pipe projects |
Concealed engineering, buried pipes without external interference |
|
Cost |
Slightly higher (including base materials and craftsmanship) |
Lower |
Summary
The PPR internal thread elbow with base, through the composite design of "PPR main body + brass internal thread + fixed base", ensures the fluid transportation performance while solving the problem of installation stability at pipe bends. It is the preferred fitting for scenarios such as bathroom and equipment connection. When selecting, attention should be paid to the safety of brass material, the structural strength of the base, and certification compliance. During installation, strict implementation of base fixing and hot - melt specifications can effectively reduce the risk of leakage and ensure the long - term reliable operation of the system.
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