Model number meaning: "PH" indicates an extension ring, and "21" indicates a nominal breaking load of 210kN.
Product Features: Made using a one-piece forging process, the ring body is highly strong. The hot-dip galvanized surface provides excellent corrosion resistance and withstands harsh outdoor operating environments. Its simple structure, with ring-type connectors at both ends, facilitates connection and length adjustment between different fittings, making it easy to use.
Main dimensions: 30mm diameter, 24mm hole diameter, 160mm ring length, 210mm total length, and approximately 1.6kg weight.
Technical Parameters: Nominal breaking load of 210kN.
Application: Used for connecting insulator strings to fittings, between clamps and insulator strings, and between lightning conductors and pole towers. It is a universal connection fitting.
The standard model number for the PH-21 extension ring is "PH-21130." The "130" designation indicates a length of 130mm and a breaking load of 210kN. Forged from round steel, it is often referred to as a parallel ring due to its parallel structure. It is primarily used to extend or change the direction of a connection. Its tensile strength during use is related to the breaking load and the alloy steel material, particularly the forging process. Generally, the tensile strength is ≥400MPa. For specialized environments, low-temperature alloys can be used to increase the tensile strength to ≥500MPa. However, precautions must be taken to avoid cold fracture during use.
Who is most interested in the PH-21 extension ring? Then, we need to consider the main applications of the extension ring:
Power engineering construction units
Long-span overhead lines, corner tower tension strings, and other transmission line connection points capable of withstanding a 200kN breaking load;
Grid operation and maintenance teams
Replacing low-strength connectors during capacity expansion and renovation of older lines, quickly repairing ring deformation caused by wind vibration or ice loads, and compatibility with standard hardware string structures;
Special environment construction
For use in corrosive environments, choose hot-dip galvanized alloy steel with a zinc coating of ≥ 70μm to extend service life.
When installing and installing the PH-21 extension ring, pay attention to the following points:
Over-index control
The extension ring can alleviate over-tension, but the hardware string force must be monitored simultaneously to prevent over-limits;
String length adjustment accuracy
When compensating for tower height differences or insulator string deviation, the string length must be precisely calibrated using an adjustment plate to avoid single-point force imbalance;
Electrical safety distance assurance
When used for jumpering on slanted towers, verify the minimum clearance between the conductor and the crossarm after the extension ring is installed to prevent electrical discharge.
The PH-21 extension ring requires not only careful installation and construction, but also long-term maintenance and care. If cracks or performance changes occur, replace it immediately.
Also, before using the PH-21 extension ring, ensure the ring is clean and undamaged. Use a soft-bristled brush and mild neutral detergent to gently scrub the surface of the ring to thoroughly remove oil, dust, and residue, and avoid damage to the anti-corrosion coating caused by abrasive materials. After rinsing with water, wipe dry with a lint-free cloth or air dry to prevent residual water stains that may cause rust. Avoid using hot water or alcohol-based solvents, as they may affect the material integrity. A clean PH-21 extension ring can maximize product performance and put the installer in a good mood.
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