Patent ID: 7621170

Claim:
A method for function testing of a safety valve for a process engineering plant, comprising the steps of: testing whether the safety valve travels from a normal position to a predetermined final position as a fully opened or closed end position in a certain operating situation of the plant, and wherein a bypass valve bypasses said safety valve and is capable of assuming an idle position as a closed position in a normal operation of the plant and a predetermined test position for function testing of said safety valve; establishing the test position of the bypass valve such that a predetermined fluid flow through the bypass valve is permitted and the fluid flow through the bypass valve is set such that with said safety valve in its final position at least one of an existing predetermined pressure difference is sensed for a leakage testing, a travel time is detected, or a distance of travel is detected for the safety valve; and compensating at least partially a drop in pressure in the fluid flow caused by the safety valve and the bypass valve as an assembly with aid of a control valve inserted downstream or upstream of the assembly.