This extract is taken from the PSG catalogue: Design for Large Movement.
We can supply non-standard designs of types ES07 to ES12 to allow for movements greater than Range 3 (+/-37.5mm).
For pipework applications with very large horizontal movements, the standard design of PTFE / stainless steel bearing with the large upper plate may not be practical. Large lateral movement could cause the pipe shoe to twist around the pipe, or a twisting moment can be applied to the pipe which is also undesirable. In these circumstances, it may be preferable to install the bearing with the smaller PTFE-bearing plate at the top. PTFE on PTFE designs with overlapping strips of PTFE can also be considered. Note that an increased coefficient of friction will apply for PTFE-on-PTFE bearings and a lower bearing pressure should be used.