Before installing the diaphragm coupling, it is essential to first verify that the two shafts of the prime mover and the driven machine are properly aligned. Check the surface of both shafts for any damage or irregularities, and ensure there is no debris inside the inner half of the coupling. Also, inspect the inner edge of the coupling’s bore for any burrs or sharp edges. If found, clean the shafts and the coupling halves thoroughly, and carefully smooth out any burrs using a fine file. Next, confirm that the inner diameter and length of both coupling halves match the specifications of the prime mover and the working machine, including the axial extension dimensions. Typically, the length of the coupling half on the prime mover and the driven end should be 10–30 mm shorter than the axial extension to allow for proper installation.
To make the installation easier, it is recommended to preheat the coupling halves in an oven or oil bath set at 120–150°C. This will slightly expand the inner bore, making it easier to fit onto the shaft. After installation, ensure that the shaft end does not protrude beyond the face of the coupling half — they should be flush with each other. Measure the distance between the two coupling halves by taking an average of readings from 3–4 points along the inner edge of the flange. The total sum of the extended section length and the two diaphragm sets should not exceed 0–0.4 mm.
Correction: Use a dial indicator to check the runout of both coupling halves on the flange face and outer circumference. If the flange diameter is less than 250 mm, the runout should not exceed 0.05 mm. For flanges larger than 250 mm, the runout should be no more than 0.08 mm. When mounting the bolts, insert them from the outside of the smaller holes on the flanges, and place the buffer sleeves, elastic washers, and nuts on the larger holes of the opposite flange. Tighten the nuts using a wrench. If the installation is difficult or if the coupling is removed, make sure not to damage the shaft or coupling halves.
Once installed, the coupling should rotate smoothly without resistance. Operators must check that the coupling nuts are tight before starting the equipment. If needed, use a wrench to tighten them. After a one-minute no-load operation, open the load line valve. When stopping the equipment, follow the reverse sequence. It is also recommended to lubricate the outer part of the coupling monthly to maintain its performance.
Practice has shown that following the manufacturer's installation, maintenance, and operational guidelines can result in 1–5 daily starts for the diaphragm coupling, with a service life of at least five years. However, improper installation, incorrect Bolt orientation, excessive misalignment between the prime mover and the driven shaft, or deformation of the diaphragm can lead to premature failure. Always refer to the manual for accurate procedures to ensure optimal performance and longevity.
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