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Assembly method of modular mechanical seals: 1. Assembly of the gland and bellows – The gland and bellows are connected using 6–12 bolts, with gaskets in between to prevent leakage of the medium. 2. Rigid ring positioning: First, fix the retaining ring to the positioning counterbore on the shaft sleeve, then insert the gland and bellows assembly so that they are in contact with the retaining ring. Next, place the rigid ring, wedge ring, and rotating seat ring; once the position of the rotating seat ring is determined, tighten the fixing screws slightly. The rotating ring is connected to the rigid ring using screws, after which the retaining ring, gland, and bellows assembly are removed. 3. End face alignment: When the rotating seat ring and the hard ring are connected to the shaft sleeve, it is necessary to maintain the verticality of the end faces. Generally, the end face runout should be less than 0.05 mm. On the assembly platform, after tightening the fixing screws on the rotating seat ring, use a dial indicator to align the part, while also tightening the screws that connect the rotating seat ring to the rigid ring, in order to ensure the verticality of the end face. 4. Adjustment of compression amount: The compression amount of modular bellows mechanical seals is determined by the thickness of the positioning block. However, some special users require a different level of compression, which can be adjusted using the following method: (1) For 45 and 55 series seals, when determining the position of the hard ring, place the water-blocking aluminum plate on the gland at the outer edge of the groove in the shaft sleeve that corresponds to the positioning block (positioning fork). Then press the rotating seat ring and the hard ring tightly against the graphite ring, thereby fixing them to the shaft sleeve. After the positioning plate is inserted, the compression amount is the designed value, which corresponds to the thickness of the fork plate. Changing the compression amount allows the hard ring to move back and forth on the shaft sleeve by an amount equal to the changed compression amount. (2) For the seals of the 60, 70, 85, 90, and 120 series, the position of the hard ring is that at which the water-blocking aluminum plate of the gland is attached to the fixing ring, and the compression amount is equal to the thickness of the positioning block. By changing the compression amount, the hard ring can be moved back and forth on the shaft sleeve; the amount of movement corresponds to the change in compression amount – greater compression leads to forward movement, while less compression results in backward movement.