FIELD: test and measurement equipment.
SUBSTANCE: invention can be used for calibration or verification of control and pressure measuring devices. Invention consists in the fact that a cylindrical nozzle of a cylinder ends in the upper part by a parabolic diffuser, expanding upwards, concaved inside, the piston is cylindrical with a truncated parabolic part, concaved inside and converging downward, and the insert is arranged in the nozzle with a gap between it and the inner surface of the nozzle, forming a circular hole for air/gas supply.
EFFECT: technical result is stability of the effective area and reproducible pressure during operation.
1 cl, 1 dwg
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