Abstract: A stopcock, in particular for burner fittings, having a housing and a truncated-cone-shaped plug rotatably inserted therein, a spindle of the plug extending through a fixed retaining disk and being provided with a setting nut by means of which a bearing is held between retaining disk and plug, wherein one bearing each is provided on either side of the retaining disk, and the retaining disk or a part of the same is attached to the housing in such a way that it can be set relative to the housing in the axial direction.

Abstract: A double piston pump mechanism includes two pistons operated out-of-phase by respective fluid-actuated cylinders. The pistons suck-in fluid through suction valves and discharge pressurized fluid through pressure valves. The actuation of the cylinders is regulated by two change-over valves which are mechanically connected to respective cylinders. Each change-over valve is actuated when its respective cylinder reaches a fully extended position or a fully retracted position. The change-over valves are connected to a control mechanism which operates to reverse the direction of actuating fluid supplied to the cylinders, the suction valves, and the pressure valves only in response to actuation of both of the change-over valves.

Abstract: In a radial piston engine having pistons bearing against the circumference of an eccentric, which pistons execute a swivelling motion upon the rotational motion of the eccentric and are in engagement with a guide body, which bears on the radially outer end by a radially outwardly convex spherical-annular bearing face against a concave spherical-annular bearing face in the housing or cylinder cover. To attain complete piston relief, the bearing arrangement is designed such that the guide body (2) is provided with an upper end face (8) which is acted on by the pressure medium over a hydraulically effective plane (de) extending perpendicularly to the longitudinal axis of the guide body (2). The hydraulically effective plane lies in the area of the bearing face (5) on the housing (6) or intersects the face for all swivelling positions of the piston (3).

Abstract: In an apparatus for controlling the operation of hydraulic motors having infinitely adjustable eccentricity, wherein a flow-control valve between a pump and a hydraulic motor supplied with pressure medium and a control valve for adjusting the eccentricity of the hydraulic motor as a function of the operating pressure required by the hydraulic motor are provided, in connection with pressure optimization for keeping constant the torque of the hydraulic motor, the hydraulic motor is provided with a regulating device (7,10) which is mechanically connected to the eccentric (3) and transmits an eccentric adjustment outward, wherein this mechanical regulating device (7,10) acts on the flow-control valve (17) in such a way that, as a function of the change in the eccentricity, the flow-control valve (17) controls the pressure-medium quantity supplied to the hydraulic motor in such a way that the speed of the hydraulic motor is kept constant.

Abstract: In order to obtain a self-control of the working pistons with a simple, space-saving construction in the case of a radial-piston engine having pot-shaped pistons which are in contact with the circumference of an eccentric shaft and into which there engages in each case a guide body mounted radially outside on the housing in floating arrangement, and having fluid ports in the cylinder cover for the inflow and outflow of the pressure fluid, a control element (15), connected in jointed manner to the guide body (5), is adjustably disposed in the cylinder cover (9) or a corresponding component of the housing, for controlling the inflow and outflow ports (19, 20).