PNEUMATIC PRESSURE SET-POINT DEVICE Russian patent published in 1994 - IPC

FIELD: pneumatic automatics. SUBSTANCE: pneumatic pressure set-point device has pressure formers, adder; valves 1-3 may be used as these units which have different levels of operation; commutator which has lock members 23-25 connected in series and corresponding to number of pressure formers. Chamber 18,19 of any foregoing valve 1, 2 is connected with nozzle 5, 6 of subsequent valve. Nozzle 4 of the first valve is connected with output channel and with pressure source through a throttle. Chamber 20 of the last valve 3 is connected with atmosphere. Nozzle 26-28 of any lock member 23-24 is connected to nozzle of corresponding valve 1-3. Through chamber 29-31 is connected to chamber 18-20 of corresponding valve. EFFECT: simplified design; reduced power consumption. 1 dwg