From the technical description of this valve made by the German company BARMAG, Model no. stamped in is VO011 34-1 or 84-1 (??)(difficult to see, although I used a steel brush):

the minimum pressure valve is to keep the system pressure behind the valve not lower than p = 30 bar.
The over pressure valve is limited to maximum p = 130 bar and open then.
Power steering pump pressure is 130-135 bar, the dual power steering pump feeds the LAD system.
Pressure inside the regulating valve?

E32 750iL 11/88, E32 750iL Highline 03/90
7 series Tech tips
http://tinyurl.com/3486c

• LAD regulating valve - disassembled pics (pic) (url) - shogun 2008-04-03 06:57:04 (1078 views)
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  • 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)
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        • 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)
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            • 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)
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                  • 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 (98 views)
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                      • 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 (98 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)