Abstract: A fluid pressure regulator valve unit for controlling the fluid pressure of a fluid in a delivery line of a fluid system having a housing with a valve chamber of a tubular cylindrical shape, and a butterfly valve rotatably supported in the valve chamber for rotation about an axis extended transversely of the chamber, which butterfly valve has a diameter less than the internal diameter of the chamber so that there is formed at least a minimum flow passage through the chamber in all rotated positions of the valve.

Abstract: A three-point mounting hitch for supporting an implement beneath a tractor and between the front and rear wheels thereof includes an upright rear frame member connectible with the tractor three-point hitch and a horizontal implement supporting frame member at the lower end of the rear frame member extended forwardly below the tractor. The implement is raised and lowered as a unit assembly with the three-point hitch into and out of an operating position. A belt drive mechanism on the hitch connects the tractor power take-off unit to the implement drive shaft.