REDUCER Russian patent published in 1994 - IPC

FIELD: instrument engineering. SUBSTANCE: inlet branch pipe 5 is connected to cylinder, filled with compressed gas, outlet pipe 2 is connected to consumer. Working medium from the cylinder enters chamber 6 and then - constrictor modules A, B, C and so on. Any module operates in special subrange of input pressure change range. Gas effects on differential piston 12. The piston presses plate 16 out of saddle 15 and the module for four stages: by needle constrictor 24, by valve-saddle pair 15, 16 and 16, 19 and by air-flow restriction member 17. When input pressure excesses over output voltage from preset range, the plate sits onto edge-saddle 19. Restriction module in this case is covered. The next restriction module begins to operate, tuned for higher subrange of changes in input pressure. Threaded rest 20 for higher subrange of changes in input pressure. Threaded rest 20 is intended for adjusting pass H of valve-saddle pair 16, 19. Threaded rest 21 is intended for adjusting elastic force of member 17. EFFECT: high precision of reduced pressure; improved reliability. 1 dwg