Abstract: DC motor-driven valve apparatus, comprising, in combination a valve unit having fluid input and output porting, the valve unit having a valve shaft rotatable between primary and secondary positions corresponding to different flow states; a reversible DC motor having a rotatable output shaft, gearing connected in the drive path between the motor output shaft and valve shaft, such that the ratio of motor shaft rotation to valve shaft rotation is in excess of 100; and circuitry including a potentiometer operatively connected to the valve shaft and to the motor to provide an output signal which varies with degree of valve shaft rotation for reversibly controlling the motor to terminate motor shaft rotation when the valve shaft alternately reaches the primary and secondary positions.

Abstract: An automated work station for testing hydraulic equipment having first hydraulic input and output ports comprising in combination a test cabinet and associated input keyboard and test data display means; a cabinet having associated second hydraulic input and output ports to be coupled to the first ports; circuitry within the cabinet and connected with the keyboard to control display of hydraulic parameters to be tested, the circuitry having inputs to be electrically connected with selectable groups of terminals corresponding to selected hydraulic equipment to be tested, and there being a characteristic control circuit for each hydraulic equipment to be tested, each characteristic control circuit being connectable with circuitry in the cabinet.

Abstract: In apparatus for counting a succession of falling liquid drops having teardrop shape, with a downwardly convex down side, the combination that includes a beam provider for providing a beam of electromagnetic radiation to sidewardly pass into the drop at its convex lower side, to be refracted within the drop to pass out of the drop at its convex lower side, and a beam detector located to detect the refracted beam that has passed sidewardly out of the drop at its convex lower side.