|Year of Manufacture:|
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74 B 21917.IssB
Serial No. 19325
Elliot Brothers (London) Ltd.
This is a hydraulic valve operated by a torque motor.
The Torque Motor is the interface between the Autopilot or Autostabiliser system and the hydraulic power actuators that operate the flying surfaces. The Torque Motors position the piston of a secondary hydraulic servo-valve which in turn drives the main actuator servo. In the autostabilisation mode a differential linkage adds these signals to those of the pilot, but the differential is locked under autopilot command and the pilot's controls are moved by the ram output, keeping the system in trim. The loop is closed electrically by a position transmitter on the output which is fed back to the Autopilot/Autostabiliser amplifier. These little motors have limited movement but operate accurately and constantly when the systems are engaged. Elliotts made torque motors for their Autopilot and Autostabiliser systems for example on the Lightning and later the VC10.
This Torque Motor is attached to a small hydraulic servo. It is marked 'Keep away from Iron and Steel' which seems at odds with the story, which cannot be verified, that these were supplied for use in Steel Rolling Mills.