FIELD: compressor engineering. SUBSTANCE: external knife edge of the lift stop is made in the form of a hypocycloid with three branches. The diameter of circumference of the guide hollow of the lift stop equals the diameter of the plate on which a shoulder is made in the location of fiting on the seat. The seat has a hollow mating the shoulder, whose cross-section with the base on the plate external surface is semi-spherical. EFFECT: improved design. 2 cl, 4 dwg
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