The purpose of the regulator is to transmit a constant torque to shaft A of the calculator mechanism when a clockwise force is applied to bell-crank lever 1 (see kinematic diagram). The torque on shaft A is equalized by regulating the clear opening of orifice b by means of shaped washers d. At this time, orifice a is closed by ball valve 5. As the mechanism is returned to its initial position by spring 2, piston 4 moves downward and fluid raises ball 5 and passes through both orifices a and b, sharply reducing the braking effect.
$3904$LHP,Rg$