Patent attributes
An air motor (34) is arranged at a right angle to the valve stem (54), through a right angle gear drive (36) that provides torque amplification. A bracket (40) associates the motor with the valve body (48), having a flat ring (68) that fits over the valve body and has clearance notches (94) providing circumferential indexing. Semi-circular locking plates (66) are axially adjacent the ring and pivoted for swinging between a locking position where they fit in a groove (59) in the valve body and an unlocking position where they are free of the groove. Each locking plate has several through-holes through any of which a locking pin (42) can pass to lock the locking plate in locking position. Each locking pin protrudes axially beyond the ring to present interference with the valve body preventing the bracket from turning when the motor operates.
