Problems with bolts and nuts in diaphragm couplings?

It should be to reduce the vibration of the diaphragm, and it probably serves as a buffer to compensate for any misalignment in the coupling!

The shaft is balanced; the flanges are also connected by bolts in this way, ensuring even stress distribution

To balance the weight; otherwise, if all the pieces on one side are large while those on the other side are small, it will affect the balance

Methods/Steps 1: The bolt is a crucial component of diaphragm couplings; whether it is installed correctly has a direct impact on the performance, lifespan, and safety of the product. Otherwise, it can lead to wasted labor and spare parts. Therefore, the correct orientation of the bolts in a diaphragm coupling is a crucial aspect; it is essential to avoid installing them in the wrong direction and to not overlook any small components, including spring washers. Only in this way can the bolt assembly perform optimally and prevent damage to other parts of the diaphragm coupling. The gap between the bolt fitting section of the 2-diaphragm coupling and the small hole fitting section of the flange is generally set at 0.20 mm to 0.30 mm, depending on the bolt diameter. This fitting section plays a crucial role in transmitting torque; if the gap exceeds the specified value, it must be replaced. The clearance between the inner hole of the buffer sleeve and diaphragm rivet and the bolt diameter is 0.5mm to 0.7mm, which serves to compress and position the diaphragm. If the bolts of a diaphragm coupling are installed in the wrong direction, it is easy for the bolts to become misaligned, causing the diaphragm to twist and deform as a result. 3 Correct method for installing the bolts of a diaphragm coupling: Pass the bolts from outside the small hole in the flange, then into the hole in the diaphragm (pay attention to the direction of the diaphragm; it is composed of multiple thin sheets held together by rivets and rivet washers. The rivet washers should make contact with the buffer sleeve, otherwise it will affect the service life of the rivet assembly). Then pass them from outside the large hole in the other flange, insert the buffer sleeve and elastic washer, and tighten the nuts. Be careful not to allow the bolts to rotate during tightening. When installing the bolts, always pay attention to their direction – installing them in the wrong direction can cause the diaphragm to twist, and over time this can lead to damage to the surfaces where the diaphragm meets the bolts as well as to the small holes in the half-shaft sections. This is because the surface of the mating portion between the bolt and the flange is a critical area for transmitting torque, and the integrity of this surface directly affects its performance in use.

The bolts of diaphragm couplings have a direction; first, it is for balance. Second: for a secure connection. Third: to transmit torque more effectively.

Thank you. Why, for ordinary opposite-wheel bolts with elastic rubber rings, are both the bolt and the nut on the same side?

Thank you. Why are the ordinary coupling bolts of the water pump, along with those equipped with elastic rubber rings, all on the same side?

Thank you. Are there any close-up photos of the wheel holes and the coupling bolts? Ours can only be taken apart and inspected during maintenance.

Thank you. Why are the bolts and nuts of ordinary opposite-wheel bolts all on the same side? In that case, there should be no problem with dynamic balance, and the same is true for the couplings in steam turbine generators.