Measuring instrument of a piston-cylinder pair clearance working in the gas dynamic suspension A. V. Samvelov, S. N. Teymurly, D. A. Shirokov, A. T. Khan Orion R&P Association, 46/2 Enthusiasts road, Moscow, 111123, Russia E-mail: teimurly-sergey@mail.ru At present piston-cylinder machines (compressors, pumps, gas-expansion machines) with a gasdynamic suspension of the pistons are quite widely applied in a lot of branches of industry and in scientific research. <...> The gas clearance is used in friction pairs to reduce a friction ratio, decrease a quantity of heat separated while there’s friction with a sequence of wearing out of junctions. <...> The present article describes a calibration succession of the gas clearance in the piston-cylinder pair, of measurement and presents the results of the clearance measurement of the piston-cylinder pair working in the gas dynamic suspension conditions. <...> These conditions were worked out particularly for the in-process measurement of the machine pistons (plunges, displacers). <...> Обоснована последовательность калибровки установки, проведения измерений и представлены результаты измерений зазоров цилиндрово-поршневой пары, работающей в условиях газодинамического подвеса, методом измерения расхода проходящего через зазор газа, разработанным специально для проведения технологического контроля поршней (плунжеров, вытеснителей) изготовляемых машин! <...>