CUTOFF DEVICE Russian patent published in 1998 - IPC

FIELD: shutting-off high-pressure pipe lines at high velocity of medium transported to them. SUBSTANCE: body of device is provided with swivel shut- off member made in form of two swivel dampers laid one on the other. One damper is unloading, it has hole and other damper is blind; it closes hole of unloading damper. Main retainer keeps shut-off member in open position. Device is provided with two sensitive elements: low-pressure sensitive element high-pressure sensitive element; both sensitive elements are made in form of spring-loaded rods. Rod of low-pressure sensitive element is connected with main retainer and rod of high-pressure sensitive element is connected with additional retainer mounted for engagement with main retainer. EFFECT: enhanced reliability. 2 dwg