Have you checked out KW's site? They've got a wealth of information on their various struts with some great cutaways for the damper setups and a breakdown on the valve construction they use.
Valves: http://www.kw-suspension.com/us/kw_valve_technology.php
Other pages of interest including extensive dynoing: http://www.kw-suspension.com/us/kw_technology_overview.php