Dump valve on a diesel is pointless ,
dumpvalves are used to stop the turbo stalling off throttle with back pressure in the inlet caused by the throttle flap being closed,
but diesels dont have throttle flaps so theres no need for a dump valve as there is no pressure build up so nothing to vent ,
also there is no manifold vaccum so theres nothing to operate the valve easily it could be done with the vac system and a series of solenoids and throttle switches but its pointless there would be no gain only the noise,
Sorry .