SLAM SHUT SAFETY DEVICE

摘要

A safety device for a gas distribution system includes a valve body (12), an upper casing (14) attached to the valve body, the upper casing housing at least one spring (30,32). Further, the at least one spring is attached to a movable diaphragm (42) that is exposed to gas system pressure. The valve body also includes a release element (62) mounted within the valve body. The release element releasing a relatch plug (70) when the device is activated to move a safety disc (16) into contact with a valve seat to stop fluid from flowing when an overpressure or an underpressure condition is sensed.