Safety shut-off, to block a flow through a gas pipe, has a thermal bimetal snap disk which changes shape abruptly on a temperature increase to close an opening in the housing

摘要

The safety shut-off for a gas pipe, to block the gas flow (2) automatically, has a housing (1) with a barrier (7) as a thermal block if the temperature rises above a threshold value. The barrier is a thermal bimetal snap disk, which changes its shape abruptly on a temperature increase, to seal an opening (6) in the housing when in the closed position against an elastomer seal (8) around the opening.