DHSVDental Health Services Victoria (Australia)
DHSVDown Hole Safety Valve (oil & gas industry)
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By blocking the hydraulic control line, it prevents migration of gaseous and fluid hydrocarbons into working areas, which in general are not hazardous area classified for such ingress -- until the DHSV is to be reopened to resume recovery of hydrocarbons, at which point the time-delayed blocking valve reopens to allow hydraulic communication.
The DHSV Eiderstedt intends to merge 2 catchment areas on the peninsula Eiderstedt in North Friesland and to automate in the course of the merging the creatine Adamsiel.