(57) An electrohydraulic servo valve (10) comprises a pair of electric motors (11) mounted
on the body - (13) of a linear hydraulic spool valve (12) and driving a common motor
shaft (77) whose rotation is transmitted directly to the valve spool (20) by a pivoted
lever (90), one end of which is engaged in a cross-bore (89) in the motor shaft (77)
and the other end of which is engaged in a cross-bore (30) in the valve spool (20).
The lever (90) is pivotally suspended by two integral rectangular-section thin steel
strips projecting at right angle from opposite sides of the lever and secured by screwed-down
integral mounting blocks (107) at their outer ends. The strips are arranged with their
widths transverse to the length of the lever (90), and twist resiliently about their
lengths as the lever pivots about a pivotal axis (92) coincident with the lengths
of the strips (105,106) providing a frictionless pivotal suspension for the lever
with a resilient centering action.
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