AUTOMATIC DEVICE FOR EMERGENCY CUTTING-OFF OF GAS PIPELINE Russian patent published in 1999 - IPC

FIELD: fittings for gas conveying pipelines. SUBSTANCE: automatic device has casing with cavity communicated with gas pipeline, valve generating gas pipeline cutting off control signal, flexible sensitive member having predetermined starting threshold, adapted for valve control and defining static and dynamic working cavities in casing. Static and dynamic cavities are in communication one with another via throttle. Automatic device has starting threshold adjusting unit. Flexible hermetically sealed chamber positioned in casing is filled with dried inert gas. Sensitive member and throttle are positioned within flexible hermetically sealed chamber. Starting threshold adjusting device and valve are connected to flexible chamber through hermetically sealed flexible deforming members. EFFECT: enhanced reliability in operation and increased efficiency. 21 cl, 6 dwg