Pneumatic stepping actuator positioner

Details Pneumatic stepping actuator positioner Pneumatic stepping actuator positioner

F - Mech Eng,Light,Heat,Weapons

15

B

121/62

F15B 21/02 (2006.01) F15B 13/16 (2006.01)

Patent

CA 1285835

PNEUMATIC STEPPING ACTUATOR POSITIONER Abstract A pneumatic control system for a reversible stepping actuator has an analog pneumatic control signal and an analog signal indicative of actual position of the actuator. Imbalance in these signals opens one or the other of a pair of comparator valves having inlets connected to a source of pneumatic pressure. Opening of either of the comparator valves enables a pulse timer which converts the pneumatic pressure from either of the comparator valves to pulses of pneumatic pressure applied to one or the other of the operators of the reversible stepping actuator. An oscillating pneumatic timer may be used to produce the pressure pulses, or an electric timer can be used to "chop" one of the pneumatic pressures into periodic pulses.

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