Pilot device for a safety valve

In a system having a pressure vessel and a safety valve for the pressure vessel, a control device, comprising:

• a pressure-displacement transducer having a pressurized space, another space separate from said pressurized space, and an adjusting body, for converting a difference in pressure between said pressurized space and said other space into a movement of said adjusting body;
• a pilot part to be triggered by said adjusting body for activating the safety valve of the pressure vessel;
• a pressure-removal line for connecting the pressure vessel to said pressurized space;
• a blow-off tank having a given pressure;
• a drainage line for connecting said other space to said blow-off tank;
• a compensating line;
• and
• a hydraulic compensating system to be connected to said blow-off tank through said compensating line, said hydraulic compensating system producing a first force on said adjusting body from said given pressure, and said first force counteracting a second force on said adjusting body produced in said other space by said given pressure.