FIELD: printing systems. SUBSTANCE: functioning of system feeding ink to jet printing head and unit to take measurement and adjust pressure and viscosity of fluid medium is based on use of chamber of variable volume connected to pressure transducer and of at least one pair of valves each connected to one limiter. Volume changes with the aid of piston set in motion by eccentric made fast to rotor of engine. Such unit operates as pump, it makes it possible to control engine, to determine viscosity of fluid and to check its homogeneity. EFFECT: improved operational efficiency of system. 7 cl, 25 dwg
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