VALVE EMERGENCY SHUTOFF AUTOMATIC DEVICE FOR MAIN PIPELINE Russian patent published in 2016 - IPC F16K17/34 

FIELD: valves production.

SUBSTANCE: present invention is intended for transportation of gases via main gas lines. Valve emergency shutoff automatic device comprises two control chambers that are connected with the gas line and communicate via calibration orifices. Outlet chamber that is connected with the hydraulic drive of the gas line shutoff device is divided by a bursting disc into two cavities. There are ballast and emergency tanks connected to the gas line via check valves. Moving rod with a conical head is located near the disc. Control chambers are separated by the first bellows arranged coaxially inside the cylindrical casing and its rigidly fixed lower cover. Upper free end of the bellows is tightly closed by a plate with calibration orifices and a central rod fixed on it; this rod has a possibility of axial movement in case of longitudinal deformation of the bellows. Central part of the rod is fixed on the plate tightly closing the lower free end of the second bellows that is rigidly fixed on the partition with a central orifice installed in the housing. Average diameters of the first D₁ and the second D₂ bellows are not equal. Total section area of the calibration orifices is calculated using an algebraic relation.

EFFECT: invention is designed to improve the operating reliability of the machine and extend its longevity.

1 cl, 2 tbl, 2 dwg