PRESSURE SET-POINT DEVICE Russian patent published in 1995 - IPC

FIELD: calibration and inspection of devices in automated systems. SUBSTANCE: device has load center, which has to be a double cylinder. Pressure governor, reverse and safety valves are connected to spaces of hydraulic cylinder. Loading unit is connected with the system through electric-hydraulic reverse valve unit. System has dead-weight pressure-gauge tester provided with mechanism for automatic mounting and removing weights, and collector, which has unit for mounting devices to be calibrated. Valve unit, manometer and drive are connected with control unit. Valve unit let liquid pass at one and other directions only at equality of pressure in the system and in space of small hydraulic cylinder till achieving value of tolerant pressure pulsation in the system. Required value of pressure can be provided in system during several passes of pistons, as a result, number of devices to be calibrated can be increased. EFFECT: improved precision; improved power of drive. 2 cl, 2 dwg, 1 tbl