I sent my friend some info and pictures posted on the board regarding our LAD regulator and strut to see if he could give us some insight into the proper type of or-rings for our applications. His reply is below:

"Without studying the parts it is difficult to know exactly what durometer you would need. You are not dealing with high temperatures and the while 2000 psi/135 bar sounds like a lot the pressure is relatively low in regard to hydraulics. A lower durometer would be ok for those parts not under a dynamic load. (In other words o-rings that do not have a moving part against them.) Determining the correct o-ring durometer is not only a matter of working pressure but also the amount, speed and frequency of travel. You would probably need a harder seal on the dynamic portions due to the fact that those o-rings would constantly be moving as the suspension goes up and down."

So am I correct that the regulator has relatively little movement in comparison to the strut? Does it only open and close when there is weight in the trunk?

1991 735 IL

• LAD regulating valve - disassembled pics (pic) (url) - shogun 2008-04-03 06:57:04 (1078 views)
  • regulating valve, accumulator sphere whistling noise? - richardthemorris 2008-04-15 05:30:21 (115 views)
    • My regulating valve whistled, now SQUEALS! - buffbuh 2008-05-02 17:32:58 (80 views)
  • Glad you diassemble one - JeffChia 2008-04-03 13:25:26 (118 views)
    • the tool (url) - shogun 2008-04-03 14:43:04 (188 views)
      • Re: the tool - ridgelyrocket 2008-04-06 01:19:50 (86 views)
      • How many people want o-rings? (pic) - JeffChia 2008-04-04 18:06:41 (158 views)
        • Re: How many people want o-rings? - sam740il 2008-04-10 17:31:06 (90 views)
          • Do not have number. but... - JeffChia 2008-04-11 21:54:11 (85 views)
            • Re: Do not have number. but... - sam740il 2008-04-12 20:27:35 (69 views)
        • just give me the sizes/dimensions - shogun 2008-04-04 18:12:12 (82 views)
          • Opened my o-ring box and they are... (pic) - JeffChia 2008-04-04 19:18:19 (147 views)
            • Just did another O-ring replacement for a friend (pic) - JeffChia 2008-04-08 23:02:14 (414 views)
              • Re: Just did another O-ring replacement for a friend - billc 2008-04-09 08:55:29 (95 views)
                • working pressure - shogun 2008-04-10 10:07:09 (90 views)
                  • Working pressure bar to psi - billc 2008-04-10 12:10:51 (85 views)
                    • Answer from hydraulics tech - re: durometer - billc 2008-04-10 19:23:02 (99 views)
                      • Attached to the sway bar, so it moves with every bump - erwin 2008-04-11 10:17:51 (110 views)
                      • yes, it only keeps always the same level (url) - shogun 2008-04-11 00:33:34 (110 views)
      • That is a 'pin wrench' ? - kfister 2008-04-03 23:29:07 (95 views)
        • Looks flimsy. Even needle nose pliers did not work for me. - JeffChia 2008-04-04 19:04:46 (84 views)
  • Re: LAD regulating valve - disassembled pics - billc 2008-04-03 09:59:19 (158 views)
  • have one for sale - eliasazem 2008-04-03 07:37:43 (99 views)
    • trades?? (pic) - eliasazem 2008-04-03 17:44:24 (188 views)
      • I accept an used Bentley manual in exchange (nt) - eliasazem 2008-04-04 07:01:56 (94 views)