AIR-OPERATED DRIVE Russian patent published in 2006 - IPC F15B9/03 

FIELD: valving.

SUBSTANCE: air-operated drive comprises electropneumatic control device, jet motor, reduction gear, crank mechanism with the output shaft, screw and nut connected with the carrier of the link, device for receiving information on the position of the output shaft of the drive having switches, device for limiting the maximum value of the torque, and device for damping kinetic energy of the movable parts of the drive which has trust bearings and plate springs. The device for damping the kinetic energy of the movable parts of the drive is provided with the radial bearing mounted in the housing of the drive. The opening in the radial bearing receives the pin of the screw for permitting axial movement. The plate springs are interposed between the pin and thrust on the face of the screw shank. Between the plate springs and rings of the thrust bearings are steel safety rings. The switches and devices for limiting the torque are provided with mechanism for moving the steel shields between the unmovable permanent magnets and sealed-contact reed relays.

EFFECT: enhanced reliability.

8 cl, 12 dwg