FIELD: engines and pumps.
SUBSTANCE: proposed packing comprises two axially symmetric parts arranged in nozzle neck on both sides on critical section to operate subject to pressure direction. Ring element made up of barrel accommodating cylinder mounted on guide rods and locked by ball lock is fitted on nozzle neck wall. Cylinder space is divided by central web with calibrated orifice into two parts. Note here that both sealing parts are made up of pistons arranged in cylinder ahead and behind of said web. In subcritical zone, said piston is spring loaded toward said web while, on nozzle edge, said piston is provided with cylindrical collar making moving support for ball lock. Said piston is secured in barrel by mean of breakaway element. Clearance between piston, on nozzle edge side, and web is filled by, for example, oil via calibrated orifice in web. Barrel side wall on nozzle edge side is provided with openings while barrel bottom is furnished with bores.
EFFECT: reliable operation.
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