When it comes to quality assurance testing, UEA means business. Each and every hydraulic swivel and combination unit that comes out of our facility is pressure checked and the rotational torque is measured prior to shipment. Should a hydraulic swivel or combination unit come back for any reason, UEA has developed the following process:
1.) Retest torque to check if there is any abnormality in the swivel itself and compare to the original end-line production torque recorded on the same swivel.
2.) Disassemble product if necessary to inspect if any internal components including seals, wearing rings, and spool surface, etc. has any damage.
3.) Communicate our test results and inspection findings back to our customer.
When retesting the swivel rotational torque, the results from that test will be compared to the original test results. Below is an example. Figure 1 is of the test set-up and torque readings and Figure 2 is the end-line production torque readings for a run quantity of 5 swivels.
It can be seen from Figure 1 and Figure 2, statistically, that the average torque is lower than the end-line production test value. This is due, as expected, to multiple rotations having completed on that hydraulic swivel, but the overall torque trend remains almost unchanged. Performing original and validation testing is one more way UEA is working to be the preferred partner for rotary motion fluid and air applications.
CFPE, Design Engineer