Danfoss A/s

Lars J Nielsen

Jens J Molbaek

Bjarne Straede

Theiss Stenstrom

Poul E Hyldig

The procedure for monitoring leakage of incompressible fluid includes introducing a predetermined volume of testing fluid into a conduit system at a pressure about the same as that at the source of the pressurized fluid during a testing period when no fluid is being withdrawn from the conduit system and flow from the fluid source is blocked and measuring the time required for the predetermined volume to flow into the conduit system. The apparatus includes a cylinder connected in parallel with the main valve between the source and the conduit system, a movable wall in the cylinder to divide it into two chambers and a spring in the chamber for urging the wall from the conduit system side chamber together with control apparatus for sensing the volume of the last mentioned chamber decreasing to a preselected volume. The control apparatus also includes mechanism for opening and closing the main valve and monitors large and/or small leakage occurrences.

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Sonderborg, Denmark

Lars J Nielsen