Abstract: An arrangement for controlling a hydraulic motor having supply and discharge sides, has a throttling directional valve having supply and discharge sides and a port, a speed lowering brake valve controlling the discharge side of the hydraulic motor and having a control piston with a control side and a port connected with said port of said directional valve, a control valve arrangement between the control side of the control piston and the supply side of the hydraulic motor and having end sides with end side ports, the control valve having a control slider which selectively connects the control side of the control piston with the supply side of the hydraulic motor and disconnects the control side of the control piston from the latter, is constantly connected at the end side ports with the discharge side of the hydraulic motor prior or after the directional valve and connects the discharge side of the hydraulic motor after the directional valve with the control side of the control piston or disconnect the discha

Abstract: A radial piston machine has a cylindrical housing which encloses a rotary shaft formed with an eccentric. A plurality of stationary piston rods is connected to the inner wall of the housing and radially directed toward the shaft. The free ends of piston rods are provided with ball-and-socket joints permitting universal rotary movement of the pistons. Each piston slidably engages the inner wall of an assigned cylinder which at its bottom wall slidably engages the eccentric. In a modification, the spherical surface of the stationary ball joint directly engages the inner wall of the cylinder.

Abstract: A pressure fluid operated limit switch, particularly for a device for controlling an adjusting element in dependence upon a control value and a reference value. The limit switch includes a housing formed with a recess in which a spring-biased valve member is positioned. The valve member normally abuts against a valve seat formed by a shoulder in the switch housing is at times moved away from that seat against the force of the spring in response to a condition of the adjusting element with which the limit switch is mechanically connected. In order to ensure rapid movement of the valve member away from its seat and thus preventing throttling of the pressure fluid when the switch is in its open position the valve member is provided with the actuating element rigidly connected thereto and carrying at its free end an axially slidable sleeve biased by a spring which is clamped between that sleeve and the valve member.

Abstract: The assembly is used with a support having a flat surface and formed with a bore extending generally parallel to but beneath the surface and with a passage extending from the bore to the surface, with a control element in the bore and pivotal therein about an axis generally parallel to the surface, and with a control rod projecting from the element through the passage beyond the surface. This rod is connected to the element and pivots therewith about the axis through an arc on pivoting of the element in the bore about the axis. The assembly comprises an elastomeric annular cuff having an inner periphery tightly engaging and secured against movement on the rod and an outer periphery engaging and slidable on the surface all around the passage and dimensioned to engage the surface all around the passage in any position of the rod. This cuff is prestressed generally parallel to the rod between its peripheries to press at the outer periphery against the surface.

Abstract: A slide valve, in particular the piston of a switching valve, is actuated in both directions of adjustment by a pressure medium which acts on the annular face and/or the circular face of a regulating piston fixed one-sidedly to the slide valve. The equalization of the differing controlling forces, determined by the different sized surfaces of the regulating piston that are subjected to pressure, is achieved by means of a spring or by an hydraulic counterforce.

Abstract: Electromagnet solenoid with a housing in which a winding support supporting the magnet winding is arranged, having an armature which supports at least one stem and is mounted to be capable of moving to and fro within the winding support, and with end pieces terminating the housing. For guiding the armature a sleeve made of magnetic material is provided within the winding support, and said sleeve has on its surface directed towards the armature a sliding coating defining an air gap (i.e. a space free of magnetic material,) and in addition to serving for guiding the armature the said sleeve serves for redirecting magnetic flux.

Abstract: A suction container for two hydraulic circuits, particularly for a steering circuit and a control circuit has a housing lower portion closed with a cover. A suction tube is inserted into the housing lower portion, which tube is connected to a first consumer line. The container also includes connections which are in communication with a second consumer line and with a fluid supply container. During operation the suction container is under predetermined pressure. A filter device is disposed in the cover before the connection to the second consumer line. A pressure-limiting valve and a reverse valve openable into the container housing are also mounted in the cover.

Abstract: A device for controlling the connection between a pressure medium source and a medium supply container is provided in a pressure medium operated system. The device includes a control valve with a housing formed with a longitudinal bore, in which a valve member is axially displaced between two end positions by pressure of the pressure medium. The valve member includes a piston and a seat portion facing a valve seat formed in the valve housing. The piston is of the diameter larger than that of the valve seat. A bore connected to the medium supply container is provided in the valve housing which is controlled by displacement of the piston.

Abstract: A force measuring procedure and a force measuring apparatus are used to control the power hoist of an agricultural tractor. The force measuring procedure operates in such a manner that the relative displacement of a point on an elastic system is detected by at least one Hall sensor disposed on either the elastic system or on the fixed frame with the Hall sensor being located in a magnetic field with a predeterminable magnetic flux. For this the force measuring apparatus has a flex rod attached to at least one of a pair of lower hitches which indicates the bending moment, and the Hall sensor is mounted with its detector surface essentially in the primary plane of bending deformation of the flex rod and is connected to the control circuit of the power hoist.

Abstract: A pressure reducing valve comprises a valve housing having an axial bore coupled to a fluid operated load device, and first and second transversely extending control bores coupled to a supply tank and a fluid pressure source, respectively. A control slide is axially shiftable in the axial bore and has first and second pistons controlling fluid flow through the control bores. The fluid pressure supplied to the load device acts on a first end of the control slide. A proportional electromagnet has a plunger which contacts and applies force to the opposite end of the control slide. A first restrictor provides fluid communication between the control slide ends, while a second restrictor provides fluid communication between the control slide opposite end and the supply tank.

Abstract: In a balanced pressure valve with a switching valve for switching over to pressureless circulation, restrictors are provided in the line carrying the system pressure in such a way that the opening motion of the main piston of the balanced pressure valve is heavily damped, and the throttle losses in the bypass line leading from the line carrying the system pressure via the switching valve to the tank are very low when the main piston is open, and with this also the resistance of the main flow via the main piston is correspondingly low.

Abstract: A load measuring apparatus for determining a load affecting a predetermined point of a mechanical system including a solid state member to which the load is directly transmitted and an integrated monolithic sensor, connected with the solid state member, with directional sensitivity to deformation, the sensor producing an electrical signal proportional to the load. The solid state member includes a unilaterally fixed rigid flexional beam having a freely protruding end portion thereof under load stress and a section thereof close to a fixing point which contains in locking contact the sensor which is sensitized in the direction of the maximum inner deformation of the flexional beam.

Abstract: A pressure control valve construction comprising a valve body having an inlet port adapted for connection to a pressure source, a pair of working ports adapted for connection to respective loads, and a pair of outlet ports connected to a reservoir. A control spool is movably mounted in a bore in the body and includes lands for respectively controlling communication between the inlet port and respective ones of the working ports and between the working ports and the outlet ports. The control spool has opposite ends with blind bores respectively provided therein, and sensing spools are respectively mounted for sliding movement in the blind bores to define spaces between the bottoms of the blind bores and the sensing spools. The spaces communicate with the working port via respective openings in the control spool. In the case of a double acting valve, an actuator is provided at each end for acting on a respective sensing spool whereas for a single acting control valve only one actuator is provided.

Abstract: A pressure control valve is provided for controlling both the low and high pressure ranges of a variable displacement pump in addition to the pressure control valve used for adjusting the variable displacement member of the variable displacement pump.

Abstract: A pressure valve has a valve member 22 which can be lifted from its seat against the effect of a valve spring 25, 26 and a control piston 12 which is movable coaxially to the valve member, and a connection passage 15, 21, 23 having a throttle point 16 extending from the pressure side of the valve member to an opening on the side of piston 12 which faces away from the valve member. In order that the valve limit pressure peaks with a simple structure, the valve spring abuts on the control piston and the surface of the valve member on which pressure acts is smaller than the surface of the control piston on which pressure acts and which connected to the valve member surface through the connection passage.

Abstract: A multi-way valve for precisely controlling supplying pressure to a load device, comprising a housing and a control slide slidably mounted in the housing. The housing has annular, internal passages axially spaced along the length of the housing, with first and fifth passages located on opposite sides of second, third and fourth passages in fluid communication with a supply tank, the load device and a fluid pressure source, respectively. The control slide is slidably mounted in the passages and has parts axially spaced along the slide and axially separated by annular grooves, and an internal, longitudinal passages. First and second springs are coupled to opposite ends of the slide and bias the slide to a middle, rest position. First and second control chambers are located in the housing adjacent the slide opposite ends for applying varying pressures to the slide opposite ends.

Abstract: An adjustable resistance circuitry is connected in parallel to the coil of a solenoid to adjust the actuating force of a magnetic drive means for valves.

Abstract: A power output control device for a pump having a delivery adjuster, is formed of a housing including a control piston attacked at one end with the output medium of the pump and having means for controlling the pump adjuster; a two-armed rocking lever is supported in the housing for movement parallel to the axis of the control piston, one arm of the lever being biased by a governor spring having a progressive biasing force while the other arm of the lever acts on the control piston against the force of pressure medium; an additional biasing spring thrusts against the other arm of the lever and a first setting screw adjusts the biasing force of the additional biasing means and a second setting screw adjusts the biasing force of the governor spring by adjusting the position of the pivot point of the two-armed rocking lever.

Abstract: A rotary machine, particularly a planetary gear motor, has a control plate 4, two annular channels (18, 19) which are arranged on the inner circumference of a cup-shaped housing section 7 and stationary commutators (8, 9) which are arranged side by side adjacent the annular channels. The control channels are coupled together when the transit channel 15 and when the plate and one of the annular channels are aligned with an open corner channel 16 and alternately with the annular channels. A simply shaped and simply manufactured commutator includes two like-formed disk-shaped commutators, which completely intersect alternately with each other. Transit channels 15 are provided and, with the plate cam and one of the annular channels, open into corner channels 16. Both commutators are arranged in such a way that at times a transit channel of a commutator adjoins a corner channel of the other commutator and vice versa.

Abstract: An inductive measuring transducer impermeable to pressure media for use with a fluidic adjusting member such as a multiple position valve as a receiving casing of non magnetic working material for receiving a magnetic core, coils surrounding the casing which are, in turn, surrounded by a housing. An operating rod passes into the casing through a connecting member and operates the core. The casing is formed as continuous, hollow cylindrical tube with a closing member or plug inserted in one end and attached in fluid tight relationship. The other end of the receiving casing is tightly connected with the connecting member which is formed as a separate part from the receiving casing.