Fail safe retaining assembly for a slam-shut safety device

摘要

A fail safe retaining plug assembly (142) for a slam- shut safety device includes a reset pin (136), a retaining plug (144) attached to the reset pin at a proximal portion (156), and a safety disk (122) attached to the reset pin at a distal portion (154). The retaining plug assembly is sufficiently long to prevent the safety disk from falling off of the distal portion before the safety disk contacts a valve seat (120). The retaining plug assembly is also sufficiently long to prevent the retaining plug from falling off of the reset pin before the safety disk contacts the valve seat.