What standards should be referred to for the installation clearance of diaphragm couplings?

The installation clearance of diaphragm couplings should be set according to specific application requirements and the manufacturer’s recommendations. Typically, such information is provided in the relevant device manuals or standard specifications. In China, standards such as GB/T 50051-2013 \"Basic Parameters and Selection of General Machinery\" can be referred to. In addition, it may also be necessary to refer to international standards such as ISO or API, especially in applications that require high precision or high performance. Generally, the axial installation clearance of diaphragm couplings should ensure sufficient freedom of movement to avoid interference caused by thermal expansion or mechanical displacement. The specific gap value should be determined based on the coupling’s model and size, as well as the temperature and load conditions of the operating environment. During actual installation, it is essential to follow the manufacturer’s instruction manual to ensure the correct installation and efficient operation of the coupling. .

It shall be in accordance with the standards provided by the manufacturer or the equipment supplier. Because the diameters and loads of the couplings vary. For reference.

Please refer to JBT 9147-1999 Diaphragm Couplings

JB ZQ 4717-2006 Diaphragm couplings for heavy machinery

Hello, I have checked this standard, and there is no such installation clearance. Thank you again.

We keep it between 0.5mm and 1mm. The prerequisite is that both the position of the driving shaft and the position of the driven shaft should be measured when they are in their operating positions; for example, this applies to the position of the balance disk in multi-stage pumps, as well as the magnetic center line of high-pressure motors.

The value of F for the two end surfaces is determined according to the specifications of the corresponding coupling; the clearance is generally around 0.4, with no specific standard established

The standard GB/T 50051-2013 \"Basic Parameters and Selection of General Machinery\" cannot be found; the standard number refers to chimneys

I think a reference value for this axial clearance is around 2 millimeters, which means 1 millimeter on each side. My understanding is that washers are installed on the tightening bolts of the diaphragm coupling, and these washers fit in a loose fit within the holes in the coupling; as a result, during operation, the pump shaft or motor shaft has some freedom to move. The clearance between the coupling halves in an elastic coupling is 2-4 millimeters. The purpose is to allow the pump shaft and the motor shaft to move freely, so I think 2 millimeters is appropriate.

Oh, from the pictures you sent, it seems to be a single diaphragm. For a single diaphragm, there should be at least a 1-millimeter gap, that’s how I understand it. If what’s needed is to stay within the standard range, then a gap of a few dozen micrometers will suffice, as it can still move on its own