In attached highlighted photos....and schematic

First Photo .......

Vacuum Converter (Item 84 on schematic), upper device, I haven't a clue as to what this device does, actuated electrically by Control Unit (Item 80 on Schematic)....it does have a complex network of hoses...one of which connects to EGR Valve (Item 60 on schematic)

Switchover Valve (Item 81 on schematic), lower device, I assume that an electrical signal is sent from Control Unit (Item 80 on schematic) something that I have not identified (yet), and once activated applies Vacuum to Air Recirculating Valve (Item 71 on schematic)

Schematic.....sorry, I rotated it so as to post it as large as possible, courtesy this forum, diagrams

Second Photo......

EGR Valve (Item 60), upper device, Operated by vacuum supplied from Vacuum Converter (Item 84)

Air Recirculating Valve (Item 70), lower device, I assume that this is the Turbo Boost Dump, Operated by vacuum supplied from Switchover Valve (Item 81)







I hope that this helps someone else, and if I am wrong please correct me....also would someone please identify or locate the "Control Unit" (item 80)

Thanx,
SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG