Abstract: A compensated work port fluid valve is provided wherein a directional control valve having an inlet chamber, an outlet chamber and a work chamber is provided with a compensator valve connected to the work chamber and having a pressure sensing compensator valve controlling the flow of fluid from the work chamber to a work port to maintain constant pressure at the work port.

Abstract: A motor or processing machine, such as a lowspeed radial piston motor, having a piston with a socket formed therein operatively contacting a ball formed on one end of a piston rod, to form a ball-and-socket joint with articulated movement, and a shoe on the other end of the piston rod, adapted to glide on a rotating element of the machine, such as a crankshaft eccentric, in which the entire piston rod is formed from a bronze-base bearing metal, such as steel bronze. At least the shoe of the piston rod may be coated with a thin, soft run-in layer, such as tin, and a pocket may be formed in the shoe of the piston rod to provide hydrostatic relief.