PNEUMATIC CONTROLLER WITH LIMITATION OF OUTPUT SIGNAL Russian patent published in 1995 - IPC

FIELD: instrument making. SUBSTANCE: pneumatic controller, having mutually connected a proportioning unit and an integrating unit, whose capacity is connected through a first constant-flow throttle with a nozzle of a first single-diaphragm follower with a shift and directly with a nozzle of a second single-diaphragm follower with a shift, whose control chamber is joined with an output duct of the controller, connected with the output of the proportioning unit; two setters of upper and lower levels, limiting the output signal of the controller, and an output of the setter of the lower level through a second constant-flow throttle is connected with a flow through chamber of the second follower with the shift, and input passages, joined with the proportioning and the integrating units, includes in addition a three-input adder, whose "minus" input is connected with the output duct of the controller and whose two "plus" inputs are connected with the output of the upper level setter and with the flow-through chamber of the first follower with the shift, whose control chamber is joined with the output of the three-input adder. Such pneumatic controller with limitation of the output signal may be widely used in chemical, petrochemical, machine engineering and other industry branches, where it is necessary to regulate manufacturing parameters. EFFECT: enlarged using range of the controller. 1 cl, 1 dwg