Pneumatic position controller

Details Pneumatic position controller Pneumatic position controller

1984-08-09

1986-12-16

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91387, 137 85, F15B 1316

Patent

active

046287930

ABSTRACT:
In a pneumatic position controller for controlling the position of a pneumatic servomotor (10) to a value determined by a pneumatic command pressure, the command pressure acts through a movable wall member (30) on a pivotable balancing member (40). The balancing member (40) controls through a baffle plate (52) the outlet nozzle (56) of a pneumatic amplifier (24). The balancing member (40) is axially spaced from a feedback lever (44), with aligned pivot axes. A helical torsion spring (50) has one end attached to the balancing member (40) and the other end attached to the feedback lever (44). The feedback lever (44) is rotatable by the servomotor (10). An advantageous and compact construction permitted by the use of the helical torsion spring (50) is described.

REFERENCES:
patent: 2940699 (1960-06-01), Plummer
patent: 3468221 (1969-09-01), Johnson
patent: 4263838 (1981-04-01), Laurent, Jr.
patent: 4343224 (1982-08-01), Kemmler

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