WORKING FLUID BY-PASSING CONTROL APPARATUS Russian patent published in 1995 - IPC

FIELD: machine engineering. SUBSTANCE: apparatus has a shut-off member with a solenoid control valve in each parallel stream, to which a common flow to be by-passed is divided, and a control unit, whose outputs are connected with an electric input of the solenoid valves. The shut-off members have non flow-through control cavity. The solenoid control valves, controlling position of the shut-off members being two-position, three-way valves with input of each valve, connected with a high-pressure pipeline. The first output of each valve is connected with the control cavity of the shut-off member, its second output-with a low-pressure pipeline. The parallel streams are divided by several groups, being different by values of flow-through section area of one shut-off member, being in its opened position, between the groups and with the same values of their flow-through cross section area inside of each group. A value of the area of one flow-through section for a group with large values of that area is equal to a value of flow-through cross section in an adjacent group, having less area of flow-through sections, multiplied by a number of the shut-off members of that group, increased by a unit. The second output of the solenoid valves, controlling the shut-off members, is connected with a first input of the two-position three-way solenoid valve, controlling modes of operation, its first output is connected with the low-pressure pipe-line and its second output - with the output of the shut-off members. EFFECT: lowered metal consumption of the construction, its increased reliability and combination of functions of shut-off valve, program control throttle and non-return valve in the same apparatus. 3 cl, 3 dwg