I. Core Structure and Design Logic
PPR Main Body and Female Threaded Interface
The main body is made of polypropylene random copolymer (PPR), which adapts to the hot-melt connection requirements of PPR pipelines (common pipe diameters are 20mm, 25mm, 32mm). The key interface is of female thread design, usually embedded with brass inserts (corrosion-resistant and high-strength). The female thread specifications correspond to common pipeline standards (such as 1/2 inch, 3/4 inch), which are used to connect pipe fittings with external threads (such as metal angle valves, faucet interfaces, pressure gauges, etc.), realizing the transition between PPR pipelines and metal/other external thread equipment.
Double-Seated Fixing Structure
Different from the single-seat elbow, its outer side integrates two independent bases. The distance between the bases is designed according to industry universal standards (such as 150mm±5mm commonly used for shower faucets, 100-120mm commonly used for washbasins). The bases are provided with screw holes, which can be fixed on the wall, bracket or pre-embedded box through stainless steel screws. The double-base design disperses the force, avoids interface loosening caused by pipeline vibration or equipment installation force, and ensures the precise positioning of the two interfaces (the distance is fixed, no need for on-site repeated adjustment).
II. Core Functions and Advantages
Precise Positioning of Dual Interfaces
The fixed distance of the double bases is a prefabricated standard size. During installation, it can be directly fixed according to the distance, avoiding equipment installation difficulties caused by manual measurement errors (such as misalignment of cold and hot water interfaces of shower faucets that cannot be connected), and greatly improving construction efficiency.
High-Strength Fixation and Vibration Resistance
The double bases are fixed through two points, making the connection between the elbow and the wall/structure more stable, especially suitable for scenarios such as frequently switched faucets and shower valves. It reduces the risk of interface displacement and leakage caused by water pressure fluctuations or external force touch during long-term use.
Compatibility and Weather Resistance
The PPR main body has a wide temperature resistance range (usually -10℃ to 95℃), which is suitable for cold and hot water systems; the brass female thread insert is rust-resistant, and can achieve long-term sealing with the cooperation of raw material tape or sealant, avoiding leakage of threaded interfaces; the overall is chemical corrosion-resistant, suitable for the transportation of tap water, weak acid and alkali liquids and other media.
III. Typical Application Scenarios
Domestic Bathroom System:
It is the core fitting for the cold and hot water interfaces of shower faucets. It is fixed in the bathroom wall, connects PPR hot water pipes and cold water pipes, and connects to the external thread water inlet end of the shower faucet through the female thread interface;
For the cold and hot water angle valve interfaces under washbasins and vegetable sinks, after the double seats are fixed, connect the angle valves, and then connect the faucets through hoses.
Commercial Kitchen and Bathroom Scenarios:
In places such as public washstands in restaurants and hotels, and back kitchen operating platforms that require paired installation of cold and hot water interfaces, the double-seat fixation ensures structural stability during long-term use.
Industrial Auxiliary Pipelines:
Dual detection interfaces with strict distance requirements, or paired water inlet/return pipeline connection points.
IV. Installation Points and Precautions
Hot-Melt Connection Specifications
The PPR end needs to be hot-melt welded with PPR pipes of corresponding diameters. Strictly control the welding temperature, depth and time to avoid pipe diameter reduction or leakage caused by virtual welding or over-welding; after welding, it needs to cool for more than 30 seconds before being stressed.
Sealing Treatment of Female Threaded Interfaces
Before connecting the female threaded interface with the external threaded pipe fitting, it is necessary to wrap 3-5 layers of raw material tape clockwise on the surface of the external thread (or apply pipeline sealant) to ensure the sealing of the thread gap; when tightening, the force should be moderate to avoid cracking of the brass insert or deformation of the PPR main body due to excessive force.
Requirements for Double-Seat Fixation
Before installation, confirm that the wall/installation surface is flat, mark the positions of the base screw holes and drill holes to pre-embed expansion pipes; when fixing, ensure that the two bases are evenly stressed to avoid uneven stress on the interface due to installation inclination; use stainless steel screws to prevent rust in humid environments.
Specification Adaptation Principle
The pipe diameter must be consistent with the PPR main pipeline; the female thread specification must match the connected equipment; the distance must be confirmed according to the equipment model.
Through the design of "double fixation + female thread transition", the PPR double-seated female threaded elbow perfectly solves the problems of positioning accuracy and structural stability of dual pipeline interfaces, and is a key fitting for realizing standardized and efficient installation in modern building cold and hot water systems.
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